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STATE STANDARD OF THE USSR UNION
END LENGTH MEASURES
PLANE PARALLEL
(ST SEV 720-77)
IPC PUBLISHING HOUSE OF STANDARDS
STATE STANDARD OF THE USSR UNION
Date of introduction 07/01/91
This standard applies to plane-parallel gauge blocks (hereinafter referred to as gauge blocks) made of steel up to 1000 mm long and hard alloy up to 100 mm long, having the shape of a rectangular parallelepiped with two flat mutually parallel measuring surfaces.
End blocks are intended to be used as:
working measures for adjusting and configuring indicating measuring instruments and for direct measurement of the linear dimensions of industrial products;
standard measures for transferring the size of a unit of length from the primary standard to gauge measures of lesser accuracy and for checking and calibrating measuring instruments.
The requirements of this standard are mandatory.
1. MAIN PARAMETERS AND DIMENSIONS
1.1. The nominal values of the length of the gauge blocks must correspond to those indicated in the table. 1.
Table 1
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Graduation of gauge blocks |
|
|
From 0.99 to 1.01 incl. » 1.99 » 2.01 » » 9.99 » 10.01 » |
|
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From 0.40 to 0.41 incl. |
|
|
From 0.1 to 0.7 incl. » 0.9 » 1.5 incl. » 9.9 » 10.1 » |
|
|
From 0.1 to 3 incl. |
|
|
From 0.5 to 25 incl. |
|
|
From 1 to 25 incl. |
|
|
From 10 to 100 incl. |
|
|
From 25 to 200 incl. |
|
|
From 50 to 300 incl. |
|
|
From 100 to 1000 inclusive. |
1.2. End gauges must be manufactured in the following accuracy classes: 0; 1; 2; 3 - made of steel; 0; 1; 2 and 3 - made of hard alloy.
Note. End gauges made of steel and hard alloy of accuracy classes 00 and 01 are manufactured by agreement between the consumer and the manufacturer.
1.3. End gauges, when used as reference gauges, must be verified as reference grades 1, 2, 3 and 4 according to MI 1604. The gauge gauges must have a distinctive sign when released from production.
1.4. End gauges should be sent in sets (see Appendix 2), special sets (see Appendix 3) or individual measures and sets of sets (see Appendix 4).
Note. The accuracy class of a set is determined by the lowest class of an individual measure included in the set. The 1.005 mm gauge block, included in sets 1, 2, 3, 12 and 15 of the 3rd accuracy class, must be no lower than the 2nd accuracy class.
1.2 - 1.4. (Changed edition, Amendment No. 1).
1.5. Cross-sectional dimensions of end blocks ( A, b) must correspond to those indicated in the table. 2.
table 2
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Nominal lengths of gauge blocks |
Cross section size A × b |
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From 0.1 to 0.20 |
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St. 0.20 to 0.29 |
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St. 0.29 to 0.6 |
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St. 0.6 to 10.1 |
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St. 10.1 to 1000 |
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Examples of symbols:
Set No. 2 of gauge blocks made of steel, accuracy class 1:
End measures 1 -H2 GOST 9038 -90
Set No. 3 of carbide gauge blocks, accuracy class 2:
End measures 2 -H3-T GOST 9038 -90
Gauge block 1.49 mm long made of steel accuracy class 3:
End measure 3 -1 ,49 GOST 9038 - 90
Set of standard gauge blocks of the 1st category:
End measures exemplary 1 -KO GOST 9038 -90
Set No. 3 of standard gauge blocks of the 2nd category:
End gauges exemplary 2NO3 GOST 9038 -90 .
(Changed edition, Amendment No. 1).
2. TECHNICAL REQUIREMENTS
2.1. End gauges must be manufactured in accordance with the requirements of this standard according to working drawings approved in the prescribed manner.
2.2. Permissible deviations of the length of gauge blocks from the nominal at a temperature of 20 ° C and deviations from plane-parallelism of the measuring surfaces should not exceed the values specified in table. 3.
Table 3
|
Nominal lengths of gauge blocks, mm |
Permissible deviations |
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|
length from the nominal value ±, µm, for accuracy classes |
from plane-parallelism, µm, for accuracy classes |
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St. 0.29 to 0.9 |
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St. 0.9 to 10 |
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St. 10 to 25 |
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St. 25 to 50 |
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Over 50 to 75 |
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St. 75 to 100 |
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St. 100 to 150 |
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St. 150 to 200 |
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These requirements do not apply to a zone 0.5 mm wide at the edges of the measuring surface, counting from non-working surfaces - for measures with a nominal length of up to 0.29 mm inclusive and 0.8 mm - for measures with a nominal length of more than 0.29 mm.
2.3. Deviations from the flatness of the measuring surfaces of gauge blocks with a length of more than 0.9 to 3 mm in a free (unground) state should not exceed 2 µm.
2.4. The grindability of the measuring surfaces of the gauge blocks must meet the requirements specified in table. 4.
Table 4
Flatness tolerance of glass plates is 0.03 microns - for accuracy classes 00, 01 and 0; 0.1 µm - for accuracy classes 1, 2 and 3.
2.5. Roughness parameter of measuring surfaces of gauge blocks rz < 0,063 мкм по ГОСТ 2789 .
2.6. The edges of the measuring surfaces of gauge blocks must be rounded to a radius not exceeding 0.3 mm, or chamfered not more than 0.3 mm.
There should be no defects on the measuring surfaces of the gauge blocks, including in the area where the chamfers transition into the measuring surface, that would negatively affect the use of the gauge blocks.
Scratches are allowed on the measuring surfaces of gauge blocks that do not affect the grindability (clause 2.4) and the deviation of the length from the nominal value and from plane-parallelism (clause 2.2).
2.7. (Deleted, Amendment No. 1).
2.8. On the measuring surfaces of gauge blocks made of hard alloy at a distance of up to 1 mm from the center of the measuring surface and at corner points at a distance of 1 - 2 mm from the non-working surfaces of gauge blocks of accuracy classes 00, 0, the presence of pores more than 120 microns in width and gauges of accuracy classes 1 is not allowed , 2 and 3 - pores more than 200 microns in width. The degree of porosity should not be higher than 0.4% according to GOST 9391.
2.9. The temperature coefficient of linear expansion of the steel gauge block material per 1 m and 1 °C should be in the range of 10.5 - 12.5 µm at temperatures from 10 to 30 ° WITH.
2.10. Carbide gauge blocks must have a linear thermal expansion coefficient at temperatures ranging from 10 to 30 ° C in accordance with table. 5 and be made entirely of carbide or steel with measuring surfaces equipped with carbide.
Table 5
Table 6
In the passport of gauge blocks made of carbide, the manufacturer must indicate the value of the temperature coefficient of linear expansion of the gauges corresponding to the grade of carbide used in the set.
2.11. The hardness of the measuring surfaces of steel gauge blocks must be at least 800 HV according to GOST 2999.
2.12. (Deleted, Amendment No. 1).
2.13. The change in the length of the gauge blocks during the year due to instability of the material should not exceed the values given in table. 6. Requirements for the stability of gauge blocks over time must be met by the manufacturer, provided that the gauge blocks have not been subjected to sudden temperature influences, vibrations and shocks, as well as the influence of magnetic fields, excluding the magnetic field of the earth.
(Changed edition, Amendment No. 1).
2.14. The tolerance for perpendicularity of non-working surfaces relative to the measuring surfaces must correspond to that indicated in the table. 7.
2.15. On the non-working surfaces of gauge blocks with a nominal length of more than 100 mm, strokes must be applied at a distance of 0.211 / from the ends of the gauge.
2.16. To connect measures into blocks with ties in accordance with GOST 4119, end measures included in sets No. 8 and 9, as well as end measures over 100 mm long in sets No. 22 - 24, must have two holes; protective measures 50 mm and end measures 51.4 and 71.5 mm in sets No. 22 - 24 - one hole.
The holes should be located at a distance of 25 mm from the measuring surfaces, and measures 51.4 and 71.5 mm from one of the measuring surfaces.
2.17. (Deleted, Amendment No. 1).
2.18. Explanations of terms used in this standard are given in Appendix 1.
Table 7
2.19. Each set of gauge blocks and a set of kits must be packed in a case, to which is attached a passport in accordance with GOST 2.601, and for standard gauge blocks and an inspection certificate in accordance with MI 1604.
(Changed edition, Amendment No. 1).
2.20. Marking
2.20.1. Each end gauge must be marked with its nominal length. On gauge blocks with a length of 5.5 mm or less, the value of the nominal length should be as far as possible from the middle of the measuring surface so that in its central part a zone 9 mm long remains free from inscriptions.
On gauge blocks longer than 5.5 mm, the nominal length value and the manufacturer's trademark must be applied to the non-working surface. In addition to the above markings, protective and exemplary measures must bear a distinctive sign. On gauge blocks of accuracy classes 00, 01 and 0 it is allowed to mark the set number or other additional marking.
2.20.2. Marking on the case is in accordance with GOST 13762.
The following must be marked on the case of each set:
trademark of the manufacturer (on the outer surface of the lid);
serial number of the set or kit;
accuracy class (for working gauge blocks); discharge (for standard gauge blocks); the inscription “example gauges” (on the outer surface of the cover of the case of the set or set of exemplary gauge blocks):
designation of this standard;
letter "T" (for carbide sets) on the inside of the case.
For each socket in which the gauge block is placed, the values of the nominal length should be indicated.
2.20.1, 2.20.2. (Changed edition, Amendment No. 1).
2.21. Package
2.21.1. End gauges in sets and end gauges with a length of 500 to 1000 mm, sent separately, must be packed in cases made of materials in accordance with GOST 13762.
Each gauge block in the set must be inserted into the appropriate slot and not fall out of it when the closed case is turned over.
3. ACCEPTANCE
3.1. To verify compliance of end blocks with the requirements of this standard, state tests are carried out, metrological certification(for exemplary gauge blocks), acceptance control, periodic tests and tests for compliance of measures with respect to the temperature coefficient of linear expansion of the material of gauge blocks (clauses 2.9 and 2.10) and for the stability of the length of gauge blocks over time (clause 2.13 - for working gauges, p. 1.6 MI 1604 - for exemplary measures).
Tests according to paragraphs are allowed. 2.9, 2.10 and 2.13, as well as tests according to clause 1.6 of MI 1604 should be combined with periodic ones.
3.2. State tests - according to GOST 8.383 and GOST 8.001. Metrological certification - according to GOST 8.326.
3.1, 3.2. (Changed edition, Amendment No. 1).
3.3. At acceptance control Each end measure is checked for compliance with the requirements of paragraphs. 2.2, 2.3, 2.4 (regarding the abrasiveness of measures to glass plates), 2.8 and 2.14-2.16.
Clause 2.5 and clause 2.4 (regarding shear force) are checked selectively in accordance with MI 1604.
3.4. Periodic tests are carried out at least once every three years for compliance with all the requirements of this standard, except paragraphs. 2.9, 2.10, 2.13 and clause 1.6 MI 1604. Periodic tests should be carried out on typical representatives:
on any one set of gauge blocks up to 100 mm long made of steel of any accuracy class and (or) grade;
on any one set of gauge blocks over 100 mm long made of steel of any accuracy class and (or) grade;
on any one set of gauge blocks made of hard alloy of any accuracy class and (or) grade.
From each set, at least 10% of the end measures are selected from the total number in one set, but not less than four measures.
In a set of carbide end blocks that have steel end blocks, 10% of the carbide measures and 10% of the steel measures are selected for testing, but not less than four each of the carbide and steel measures.
The results of periodic tests are considered satisfactory if all measures tested meet all controlled requirements.
3.5. Tests according to paragraphs. 2.9, 2.10 and 2.13 and clause 1.6 of MI 1604 are carried out at least once every three years, on at least four measures of each typical representative in accordance with clause 3.4 of this standard. In case of combining tests with periodic testing measures are selected from sets selected for periodic testing.
Tests may be carried out on at least four separately manufactured measures of both carbide and steel.
Test results are considered satisfactory if all tested measures meet the requirements being tested.
3.4, 3.5. (Changed edition, Amendment No. 1).
3.6. (Deleted, Amendment No. 1).
4. CONTROL AND TEST METHODS
4.1. Verification of end blocks according to MI 2079, MI 2186, GOST 8.367 and MI 1604.
(Changed edition, Amendment No. 1).
4.2. Impact of climatic factors external environment during transportation they are checked in climatic chambers. Tests are carried out in the following mode: at a temperature of plus (50 ± 3) °C, minus (50 ± 3) °C and at a relative humidity of (95 ± 3)% at a temperature of (35 ± 3) °C. Exposure in the climatic chamber in each mode is 2 hours. After testing, all tested measures must comply with the requirements of paragraphs. 2.2; 2.3; 2.4.
4.3. When checking the influence of transport shaking, an impact stand is used, which creates shaking with an acceleration of 30 m/s 2 and a frequency of 80 - 120 beats per minute.
Boxes with packed measures are attached to a stand and tested at total number blows 15000. After testing metrological characteristics measures should not exceed the values provided by this standard.
5. TRANSPORTATION AND STORAGE
Transportation and storage according to GOST 13762.
It is allowed to transport end blocks without packaging them in transport containers.
6. OPERATING INSTRUCTIONS
Operating conditions for end blocks are in accordance with RD 50-98.
7. MANUFACTURER WARRANTY
The manufacturer guarantees compliance of end blocks and their sets with the requirements of this standard, subject to the conditions of transportation, storage and operation.
Warranty period from the date of commissioning:
6 months - for measures and sets made of steel and for sets made of hard alloy, including measures made of steel;
18 months - for measures and sets made of carbide.
ANNEX 1
Information
EXPLANATION OF TERMS USED IN THIS STANDARD
|
Gauge length (at any point) |
The length of a perpendicular extending from a given point on the measuring surface of a gauge block to its opposite measuring surface. Note. The opposite measuring surface in the absolute interference method of measuring the length of measures is the surface of a flat auxiliary plate made of the same material and with a surface of the same quality as the end measure to which it is ground. |
|
Deviation of the length of the gauge block from the nominal value |
Largest by absolute value the difference between the length of the gauge block at any point and the nominal length of the gauge block. |
|
Deviation from plane-parallelism of the gauge block |
The difference between the longest and shortest lengths of the gauge block. |
|
End block grindability |
A property of the measuring surfaces of a gauge block that ensures strong adhesion of the gauge blocks to each other, as well as to flat metal or glass plates when applying or sliding one gauge block onto another or a block block onto a plate. Lappability is characterized by shear force. |
|
Protective measure |
A measure installed at the edge of the block of measures to protect the main measures from wear. |
|
Set of special measures |
A set of measures intended for verification of certain products and measuring instruments (wires, micrometers, caliper tools, opticators). |
APPENDIX 2
Mandatory
SETS OF END PARALLEL LENGTH GAUGES
|
Dial number |
Number of measures in set |
Gradation of measures, mm |
Nominal lengths of measures, mm |
Number of measures |
Protective measures |
Set accuracy class |
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|
Nominal length, mm |
Number of measures |
carbide |
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From 1 to 1.5 incl. |
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From 1.6 to 2 incl. |
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From 2.5 to 10 |
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From 20 to 100 incl. |
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From 1 to 1.1 incl. |
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From 1.2 to 2 inclusive. |
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From 3 to 10 incl. |
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From 20 to 100 incl. |
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From 1 to 1.5 incl. |
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From 1.6 to 2 incl. |
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From 2.5 to 25 incl. |
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From 30 to 100 incl. |
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From 2 to 2.01 incl. |
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From 1.99 to 2 inclusive. |
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From 1 to 1.01 incl. |
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From 0.99 to 1 incl. |
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From 125 to 200 incl. » 250 » 300 » » 400 » 500 » |
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From 100 to 1000 inclusive. |
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From 0.1 to 0.29 incl. |
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From 0.3 to 0.7 » 0.8 to 0.9 incl. |
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From 0.9 to 1.5 incl. From 1.6 to 2 incl. From 2.5 to 5 inclusive. |
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From 10 to 100 incl. |
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From 10.5 to 25 incl. From 30 to 100 incl. |
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From 1 to 1.1 incl. From 1.2 to 2 inclusive. From 3 to 10 incl. |
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From 0.991 to 1.009 inclusive. |
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From 1.991 to 2.009 inclusive. |
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Note. End blocks in sets No. 1, 2 and 3 made of hard alloy with a length exceeding 5 mm may be replaced with end blocks made of steel. |
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APPENDIX 3
SPECIAL SETS OF PLANE-PARALLEL LENGTH MEASURES
|
Nominal values of gauge blocks, mm |
Set accuracy class |
Set rank |
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|
carbide |
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Set No. 20 (23 measures) 0,12; 0,14; 0,17; 0,2; 0,23; 0,26; 0,29; 0,34; 0,4; 0,43; 0,46; 0,57; 0,7; 0,9; 1,0; 1,16; 1,3; 1,44; 1,6; 1,7; 1,9; 2; 3,5 |
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Set No. 21 (20 measures) 5,12; 10,24; 15,36; 21,5; 25; 30,12; 35,24; 40,36; 46,5; 50; 55,12; 60,24; 65,36; 71,5; 75; 80,12; 85,24; 90,36; 96,5; 100 |
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Set No. 22 (7 measures) 21,2; 51,4; 71,5; 101,6; 126,8; 150; 175 |
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Set No. 23 (13 measures) 1,00; 1,00; 1,05; 1,10; 2,00; 2,00; 21,2; 51,4; 71,5; 101,6; 126,8; 150; 175 |
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Set No. 24 (25 measures) 1,00; 1,00; 1,04; 1,05; 1,06; 1,10; 1,11; 1,12; 1,13; 1,17; 1,18; 1,19; 2,00; 2,00; 21,2; 51,4; 71,5; 101,6; 126,8; 150; 175; 250; 400; 600; 1000 |
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Set No. 25 (15 measures) 0,990; 0,992; 0,994; 0,995; 0,996; 0,998; 1,000; 1,002; 1,005; 1,010; 1,015; 1,020; 1,030; 1,040; 1,050 |
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Set No. 26 (8 measures) 0,990; 0,995; 1,000; 1,005; 1,010; 1,020; 1,030; 1,050 |
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Set No. 27 (9 measures) 1,00; 1,02; 1,04; 1,05; 1,06; 1,08; 1,10; 1,15; 1,20 |
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Set No. 28 (28 measures) 1,00; 1,02; 1,04; 1,06; 1,08; 1,10; 1,12; 1,14; 1,16; 1,18; 1,20; 1,24; 1,28; 1,30; 1,32; 1,36; 1,40; 1,50; 1,60; 1,70; 1,80; 1,90; 2,0; 2,2; 2,4; 2,6; 2,8; 3,0 |
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Set No. 29 (8 measures) 0,990; 0,995; 1,000; 1,005; 1,010; 1,020; 1,030; 1,040 |
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Set No. 30 (7 measures) 5,12; 10,24; 15,36; 19,50; 20; 21,50; 25 |
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Set No. 31 (9 measures) 1; 1,01; 1,02; 1,03; 1,04; 1,05; 1,06; 1,08; 1,10 |
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Set No. 32 (7 measures) 0,995; 1; 1,005; 1,010; 1,020; 1,030; 1,040 |
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Set No. 33 (7 measures) 1; 1,06; 1,10; 1,12; 1,18; 1,20; 1,30 |
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Set No. 34 (9 measures) 1,001; 1,002; 1,003; 1,005; 1,006; 1,007; 1,008; 1,009 |
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Set No. 35 (9 measures) 1,01; 1,02; 1,03; 1,04; 1,05; 1,06; 1,07; 1,08; 1,09 |
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|
Set No. 36 (13 measures) 1; 1,001; 1,002; 1,003; 1,004; 1,005; 1,006; 1,010; 1,020; 1,030; 1,040; 1,050; 1,060 |
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|
Set No. 37 (8 measures) 1 - 2 pcs.; 10 - 2 pcs.; 50 - 2 pcs.; 100 - 2 pcs. |
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|
Note. End blocks in sets No. 23 and 24 made of hard alloy with a length of over 5 mm may be replaced with end blocks made of steel. |
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APPLICATION 3 . (Changed edition, Amendment No. 1).
APPENDIX 4
SET OF EXAMPLE LENGTH GAUGE SETS
|
Dial number |
|
|
3, 10, 11, 16, 17, 20, 21 |
APPLICATION 4 . (Introduced additionally, Amendment No. 1).
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Machine Tool and Tool Industry of the USSR
DEVELOPERS
A.M. Smogorzhevsky, N.A. Mikhailova
2. APPROVED AND ENTERED INTO EFFECT by the Resolution State Committee USSR on product quality management and standards dated January 25, 1990 No. 86
Change No. 1 was adopted by the Interstate Council for Standardization, Metrology and Certification (Minutes No. 4 of October 21, 1993)
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State name |
Name of the national standardization body |
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Republic of Armenia |
Armgosstandard |
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Republic of Belarus |
State Standard of Belarus |
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The Republic of Kazakhstan |
Gosstandart of the Republic of Kazakhstan |
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The Republic of Moldova |
Moldovastandard |
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Russian Federation |
Gosstandart of Russia |
2.20.2, 2.21.1, sec. 5 |
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|
1.3, 2.19, 3.1, 3.3 - 3.5, 4.1 |
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|
TU 3-3.2123-88 |
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8. The validity period was lifted according to Protocol No. 5-94 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-12-94)
9. REISSUE (March 1998) with Change No. 1, approved in June 1996 (IUS 9-96)
STANDARD
STATE
USSR UNION
TECHNICAL CONDITIONS
GOST 9038-90 (ST SEV 720-77)
Official publication
IPC PUBLISHING HOUSE OF STANDARDS Moscow
UDC 531.711.51:006.354 Group P51
STATE STANDARD OF THE USSR UNION
END LENGTH MEASURES, PARALLEL
Specifications
Gauge blocks. Specifications
(ST SEV 720-77)
Date of introduction 07/01/91
This standard applies to plane-parallel gauge blocks (hereinafter referred to as gauge blocks) made of steel up to 1000 mm long and hard alloy up to 100 mm long, having the shape of a rectangular parallelepiped with two flat mutually parallel measuring surfaces.
End blocks are intended to be used as:
working measures for adjusting and configuring indicating measuring instruments and for direct measurement of the linear dimensions of industrial products;
standard measures for transferring the size of a unit of length from the primary standard to gauge measures of lesser accuracy and for checking and calibrating measuring instruments.
The requirements of this standard are mandatory.
1. MAIN PARAMETERS AND DIMENSIONS
1.1. The nominal values of the length of the gauge blocks must correspond to those indicated in the table. 1.
1.2. End gauges must be manufactured in the following accuracy classes: 0; 1; 2; 3 - made of steel; 0; 1; 2 and 3 - made of hard alloy.
Note. End gauges made of steel and hard alloy of accuracy classes 00 and 01 are manufactured by agreement between the consumer and the manufacturer.
1.3. End gauges, when used as reference gauges, must be verified as reference grades 1, 2, 3 and 4 according to MI 1604. The gauge gauges must have a distinctive sign when released from production.
1.4. End gauges should be sent in sets (see Appendix 2), special sets (see Appendix 3) or individual measures and sets of sets (see Appendix 4).
Note. The accuracy class of a set is determined by the lowest class of an individual measure included in the set. The 1.005 mm gauge block, included in sets 1, 2, 3, 12 and 15 of the 3rd accuracy class, must be no lower than the 2nd accuracy class.
1.2-1.4. (Changed edition, Amendment No. 1).
1.5. The cross-sectional dimensions of the end measures (a, b) must correspond to those indicated in the table. 2.
Table 2 mm
|
Nominal lengths |
Cross-sectional size ax b |
|
|
gauge blocks | ||
|
From 0.1 to 0.20 | ||
|
St. 0.20 to 0.29 | ||
|
St. 0.29 to 0.6 | ||
|
St. 0.6 to 10.1 | ||
|
St. 10.1 to 1000 | ||
Examples of symbols:
Set No. 2 of gauge blocks made of steel, accuracy class 1:
End blocks 1-N2 GOST 9038-90 Set No. 3 end blocks made of hard alloy accuracy class 2:
End blocks 2-NZ-T GOST 9038-90 End block 1.49 mm long made of steel, accuracy class 3:
Gauge block 3-1.49 GOST 9038-90 Set of standard gauge blocks of the 1st category:
Exemplary end blocks 1-KO GOST 9038-90 Set No. 3 of exemplary end measures of the 2nd category:
End gauges are exemplary 2NOZ GOST 9038-90.
(Changed edition, Amendment No. 1).
2. TECHNICAL REQUIREMENTS
2.1. End gauges must be manufactured in accordance with the requirements of this standard according to working drawings approved in the prescribed manner.
2.2. Permissible deviations of the length of gauge blocks from the nominal at a temperature of 20 * C and deviations from plane-parallelism of the measuring surfaces should not exceed the values specified in the table. 3.
Table 3
Permissible deviations
|
Nominal lengths of gauge blocks, mm |
length from the nominal value ±, µm, for accuracy classes |
from plane-parallelism, µm, for accuracy classes |
||||||||||||
These requirements do not apply to a zone 0.5 mm wide at the edges of the measuring surface, counting from non-working surfaces - for measures with a nominal length of up to 0.29 mm inclusive and 0.8 mm - for measures with a nominal length of more than 0.29 mm.
2.3. Deviations from the flatness of the measuring surfaces of gauge blocks with a length of over 0.9 to 3 mm in a free (unground) state should not exceed 2 µm.
2.4. The grindability of the measuring surfaces of the gauge blocks must meet the requirements specified in table. 4.
Table 4
Flatness tolerance of glass plates is 0.03 microns - for accuracy classes 00, 01 and 0; 0.1 µm - for accuracy classes 1, 2 and 3.
2.5. Roughness parameter of measuring surfaces of gauge blocks Rz< 0,063 мкм по ГОСТ 2789.
2.6. The edges of the measuring surfaces of gauge blocks must be rounded to a radius not exceeding 0.3 mm, or chamfered not more than 0.3 mm.
There should be no defects on the measuring surfaces of the gauge blocks, including in the area where the chamfers transition into the measuring surface, that would negatively affect the use of the gauge blocks.
Scratches are allowed on the measuring surfaces of gauge blocks that do not affect the grinding properties (clause 2.4) and the deviation of the length from the nominal value and from plane-parallelism (clause 2.2).
2.7. (Deleted, Amendment No. 1).
2.8. On the measuring surfaces of gauge blocks made of hard alloy at a distance of up to 1 mm from the center of the measuring surface and at corner points at a distance of 1-2 mm from the non-working surfaces of gauge blocks of accuracy classes 00, 0, the presence of pores more than 120 microns in width and gauge blocks of accuracy classes 1 is not allowed , 2 and 3 - pores more than 200 microns in width. The degree of porosity should not be higher than 0.4% according to GOST 9391.
2.9. The temperature coefficient of linear expansion of the material of steel gauge blocks per 1 m and GS should be in the range of 10.5-12.5 microns at temperatures from 10 to 30 °C.
2.10. End gauges made of hard alloy must have a temperature coefficient of linear expansion at temperatures from 10 to 30 °C in accordance with table. 5 and be made entirely of carbide or steel with measuring surfaces equipped with carbide.
Table 5
In the passport of gauge blocks made of carbide, the manufacturer must indicate the value of the temperature coefficient of linear expansion of the gauges corresponding to the grade of carbide used in the set.
2.11. The hardness of the measuring surfaces of steel gauge blocks must be at least 800 HV according to GOST 2999.
2.12. (Excluded, Rev. No. 1).
Table 6
2.13. The change in the length of the gauge blocks during the year due to instability of the material should not exceed the values given in table. 6.
Requirements for the stability of end blocks over time must be ensured by the manufacturer, provided that the end blocks have not been subjected to sudden temperature influences, vibrations and shocks, as well as the influence of magnetic fields, excluding the earth's magnetic field.
(Changed edition, Rev., No. 1).
Table 7
2.14. The tolerance for perpendicularity of non-working surfaces relative to the measuring surfaces must correspond to that indicated in the table. 7.
2.15. On the non-working surfaces of gauge blocks with a nominal length of more than 100 mm, strokes must be applied at a distance of 0.211 / from the ends of the gauge.
2.16. To connect measures into blocks
with ties in accordance with GOST 4119, end measures included in sets No. 8 and 9, as well as end measures over 100 mm long in sets No. 22-24 must have two holes; protective measures 50 mm and end measures 51.4 and 71.5 mm in sets No. 22-24 - one hole.
The holes should be located at a distance of 25 mm from the measuring surfaces, and measures 51.4 and 71.5 mm from one of the measuring surfaces.
2.17. (Deleted, Amendment No. 1).
2.18. Explanations of terms used in this standard are given in Appendix 1.
2.19. Each set of gauge blocks and sets of sets must be packed in a case, to which is attached a passport in accordance with GOST 2.601, and for standard gauge blocks, an inspection certificate in accordance with MI 1604.
(Changed edition, Amendment No. 1).
2.20. Marking
2.20.1. Each end gauge must be marked with its nominal length. On gauge blocks with a length of 5.5 mm or less, the value of the nominal length should be as far as possible from the middle of the measuring surface so that in its central part a zone 9 mm long remains free from inscriptions.
On gauge blocks longer than 5.5 mm, the nominal length value and the manufacturer's trademark must be applied to the non-working surface. In addition to the above markings, protective and exemplary measures must bear a distinctive sign. On gauge blocks of accuracy classes 00, 01 and 0 it is allowed to mark the set number or other additional marking.
2.20.2. Marking on the case is in accordance with GOST 13762.
The following must be marked on the case of each set:
trademark of the manufacturer (on the outer surface of the lid);
serial number of the set or kit;
accuracy class (for working gauge blocks); discharge (for standard gauge blocks); the inscription “example gauges” (on the outer surface of the cover of the case of the set or set of exemplary gauge blocks);
designation of this standard;
letter "T" (for carbide sets) on the inside of the case.
For each socket in which the gauge block is placed, the values of the nominal length should be indicated.
2.20.1. 2.20.2. (Changed edition, Amendment No. 1).
2.21. Package
2.21.1. End gauges in sets and end gauges with a length of 500 to 1000 mm, sent separately, must be packed in cases made of materials in accordance with GOST 13762.
Each gauge block in the set must be inserted into the appropriate slot and not fall out of it when the closed case is turned over.
3. ACCEPTANCE
3.1. To check the compliance of the end blocks with the requirements of this standard, state tests, metrological certification (for exemplary end blocks), acceptance control, periodic tests and tests for compliance of the measures are carried out for the temperature coefficient of linear expansion of the material of the end blocks (clauses 2.9 and 2.10) and for length stability end measures in time (clause 2.13 - for working measures, clause 1.6 MI 1604 - for exemplary measures).
Tests according to paragraphs are allowed. 2.9, 2.10 and 2.13, as well as tests according to clause 1.6 of MI 1604 should be combined with periodic ones.
3.2. State tests - according to GOST 8.383 and GOST 8.001.
Metrological certification - according to GOST 8.326.
3.1, 3.2. (Changed edition, Amendment No. 1).
3.3. During acceptance inspection, each end gauge is checked for compliance with the requirements of paragraphs. 2.2, 2.3, 2.4 (regarding the abrasiveness of measures to glass plates), 2.8 and 2.14-2.16.
Clause 2.5 and clause 2.4 (regarding shear force) are checked selectively in accordance with MI 1604.
3.4. Periodic tests are carried out at least once every three years for compliance with all the requirements of this standard, except paragraphs. 2.9, 2.10, 2.13 and clause 1.6 MI 1604. Periodic tests should be carried out on typical representatives:
on any one set of gauge blocks up to 100 mm long made of steel of any accuracy class and (or) grade;
on any one set of gauge blocks over 100 mm long made of steel of any accuracy class and (or) grade;
on any one set of gauge blocks made of hard alloy of any accuracy class and (or) grade.
From each set, at least 10% of the end measures are selected from the total number in one set, but not less than four measures.
In a set of carbide end blocks that have steel end blocks, 10% of the carbide measures and 10% of the steel measures are selected for testing, but not less than four each of the carbide and steel measures.
The results of periodic tests are considered satisfactory if all measures tested meet all controlled requirements.
3.5. Tests according to paragraphs. 2.9, 2.10 and 2.13 and clause 1.6 of MI 1604 are carried out at least once every three years, on at least four measures of each typical representative in accordance with clause 3.4 of this standard. When testing is combined with periodic testing, measures are selected from the sets selected for periodic testing.
Tests may be carried out on at least four separately manufactured measures of both carbide and steel.
Test results are considered satisfactory if all tested measures meet the requirements being tested.
3.4, 3.5. (Changed edition, Amendment No. 1).
3.6. (Deleted, Amendment No. 1).
4. CONTROL AND TEST METHODS
4.1. Verification of end blocks according to MI 2079, MI 2186, GOST 8.367 and MI 1604.
(Changed edition, Amendment No. 1).
4.2. Impact climatic factors external environment during transportation is checked in climatic chambers. Tests are carried out in the following mode: at a temperature of plus (50±3) "C, minus (50±3) °C and at relative humidity (95±3)% at a temperature of (35±3) °C. Exposure in a climate chamber at each mode for 2 hours. After testing, all tested measures must comply with the requirements of paragraphs 2.2; 2.3; 2.4.
4.3. When checking the influence of transport shaking, an impact stand is used, which creates shaking with an acceleration of 30 m/s 2 and a frequency of 80-120 beats per minute.
Boxes with packaged measures are attached to a stand and tested with a total number of impacts of 15,000. After testing, the metrological characteristics of the measures should not exceed the values provided by this standard.
5. TRANSPORTATION AND STORAGE
Transportation and storage according to GOST 13762.
It is allowed to transport end blocks without packaging them in transport containers.
6. OPERATING INSTRUCTIONS
Operating conditions for end blocks are in accordance with RD 50-98.
7. MANUFACTURER WARRANTY
The manufacturer guarantees compliance of end blocks and their sets with the requirements of this standard, subject to the conditions of transportation, storage and operation.
Warranty period from the date of commissioning:
6 months - for measures and sets made of steel and for sets made of hard alloy, including measures made of steel;
18 months - for measures and sets made of carbide.
APPENDIX 1 Reference
EXPLANATION OF TERMS USED IN THIS STANDARD
|
Gauge length (at any point) |
The length of a perpendicular extending from a given point on the measuring surface of a gauge block to its opposite measuring surface. Note. The opposite measuring surface in the absolute interference method of measuring the length of measures is the surface of a flat auxiliary plate made of the same material and with a surface of the same quality as the end measure to which it is ground. |
|
Deviation of the length of the gauge block from the nominal value |
The largest absolute value difference between the length of the gauge block at any point and the nominal length of the gauge block. |
|
Deviation from plane-parallelism of the gauge block End block grindability |
The difference between the longest and shortest lengths of the gauge block. A property of the measuring surfaces of a gauge block that ensures strong adhesion of the gauge blocks to each other, as well as to flat metal or glass plates when applying or sliding one gauge block onto another or a block block onto a plate. Lappability is characterized by shear force. |
|
Protective measure |
A measure installed at the edge of the block of measures to protect the main measures from wear. |
|
Set of special measures |
A set of measures intended for verification of certain products and measuring instruments (wires, micrometers, caliper tools, opticators). |
APPENDIX 2 Mandatory
SETS OF END PARALLEL LENGTH GAUGES
|
I Number I set |
oo 1 Number of measures in w set |
1 Gradation I measures, mm |
Nominal lengths of measures, mm |
Number of measures |
Protective measures |
Set accuracy class |
||
|
Nominal length, mm |
Number of measures |
carbide |
||||||
|
From 1 to 1.5 incl. | ||||||||
|
From 1.6 to 2 incl. | ||||||||
|
From 2.5 to 10 | ||||||||
|
From 20 to 100 incl. | ||||||||
|
From 1 to 1.1 incl. | ||||||||
|
From 1.2 to 2 inclusive. | ||||||||
|
From 3 to 10 incl. | ||||||||
|
From 20 to 100 incl. | ||||||||
|
From 1 to 1.5 incl. | ||||||||
|
From 1.6 to 2 incl. | ||||||||
|
From 2.5 to 25 incl. | ||||||||
|
From 30 to 100 incl. | ||||||||
|
From 2 to 2.01 incl. | ||||||||
|
From 1.99 to 2 inclusive. | ||||||||
|
From 1 to 1.01 incl. | ||||||||
|
From 0.99 to 1 incl. | ||||||||
|
From 125 to 200 incl. | ||||||||
|
* 400 *■ 500 * | ||||||||
|
From 100 to 1000 inclusive. | ||||||||
|
From 0.1 to 0.29 incl. | ||||||||
|
From 0.3 to 0.7 | ||||||||
|
* 0.8 to 0.9 incl. | ||||||||
|
From 0.9 to 1.5 incl. | ||||||||
|
From 1.6 to 2 incl. | ||||||||
|
From 2.5 to 5 inclusive. | ||||||||
|
From 10 to 100 incl. | ||||||||
|
From 10.5 to 25 incl. | ||||||||
|
From 30 to 100 incl. | ||||||||
|
From 1 to 1.1 incl. | ||||||||
|
From 1.2 to 2 inclusive. | ||||||||
|
From 3 to 10 incl. | ||||||||
Continuation
Note End blocks in sets No. 1, 2 and 3 made of hard alloy with a length exceeding 5 mm can be replaced with end blocks made of steel.
SPECIAL SETS OF PLANE-PARALLEL LENGTH MEASURES
|
Set accuracy class | |||
|
carbide |
|||
|
Set No. 20 (23 measures) 0,12; 0,14; 0,17; 0,2; 0,23; 0,26; 0,29; 0,34; 0,4; 0,43; 0,46; 0,57; 0,7; 0,9; 1,0; 1,16; 1,3; 1,44; 1,6; 1,7; 1,9; 2; 3,5 | |||
|
Set No. 21 (20 measures) 5,12; 10,24; 15,36; 21,5; 25; 30,12; 35,24; 40,36; 46,5; 50; 55,12; 60,24; 65,36; 71,5; 75; 80,12; 85,24; 90,36; 96,5; 100 | |||
|
Set No. 22 (7 measures) 21,2; 51,4; 71,5; 101,6; 126,8; 150; 175 | |||
|
Set No. 23 (13 measures) 1,00; 1,00; 1,05; 1,10; 2,00; 2,00; 21,2; 51,4; 71,5; 101,6; 126,8; 150; 175 | |||
|
Set N° 24 (25 measures) 1,00; 1,00; 1,04; 1,05; 1,06; 1,10; 1,11; 1,12; 1,13; 1,17; 1,18; 1,19; 2,00; 2,00; 21,2; 51,4; 71,5; 101,6; 126,8; 150; 175; 250; 400; 600; 1000 | |||
|
Set No. 25 (15 measures) 0,990; 0,992; 0,994; 0,995; 0,996; 0,998; 1,000; 1,002; 1,005; 1,010; 1,015; 1,020; 1,030; 1,040; 1,050 | |||
|
Set No. 26 (8 measures) 0,990; 0,995; 1,000; 1,005; 1,010; 1,020; 1,030; 1,050 | |||
|
Set No. 27 (9 measures) 1,00; 1,02; 1,04; 1,05; 1,06; 1,08; 1,10; 1,15; 1,20 | |||
Continuation
|
Nominal values of gauge blocks, mm |
Set accuracy class | ||
|
carbide |
|||
|
Set No. 28 (28 measures) 1,00; 1,02; 1,04; 1,06; 1,08; 1,10; 1,12; 1,14; 1,16; 1,18; 1,20; 1,24; 1,28; 1,30; 1,32; 1,36; 1,40; 1,50; 1,60; 1,70; 1,80; 1,90; 2,0; 2,2; 2,4; 2,6; 2,8; 3,0 | |||
|
Set No. 29 (8 measures) 0,990; 0,995; 1,000; 1,005; 1,010; 1,020; 1,030; 1,040 | |||
|
Set No. 30 (7 measures) 5,12; 10,24; 15,36; 19,50; 20; 21,50; 25 | |||
|
Set No. 31 (9 measures) 1; 1,01; 1,02; 1,03; 1,04; 1,05; 1,06; 1,08; 1,10 | |||
|
Set No. 32 (7 measures) 0,995; 1; 1,005; 1,010; 1,020; 1,030; 1,040 | |||
|
Set No. 33 (7 measures) 1; 1,06; 1,10; 1,12; 1,18; 1,20; 1,30 | |||
|
Set No. 34 (9 measures) 1,001; 1,002; 1,003; 1,005; 1,006; 1,007; 1,008; 1,009 | |||
|
Set No. 35 (9 measures) 1,01; 1,02; 1,03; 1,04; 1,05; 1,06; 1,07; 1,08; 1,09 | |||
|
Set No. 36 (13 measures) 1; 1,001; 1,002; 1,003; 1,004; 1,005; 1,006; 1,010; 1,020; 1,030; 1,040; 1,050; 1,060 | |||
|
Set No. 37 (8 measures) 1-2 pcs.; 10-2 pcs.; 50-2 pcs.; 100-2 pcs. | |||
Note. End blocks in sets No. 23 and 24 made of hard alloy with a length of over 5 mm may be replaced with end blocks made of steel.
APPENDIX 3. (Changed edition, Amendment No. 1).
SET OF EXAMPLE LENGTH GAUGE SETS
INFORMATION DATA
1. DESIGNED AND INTRODUCED by the Ministry machine tool and tool industry of the USSR
DEVELOPERS
A.M. Smogorzhevsky, N.A. Mikhailova
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Product Quality Management and Standards dated January 25, 1990 No. 86
Change No. 1 was adopted by the Interstate Council for Standardization, Metrology and Certification (Minutes No. 4 of October 21, 1993)
3. INSTEAD GOST 9038-83
4. Frequency - 5 years
5. The standard fully complies with ST SEV 720-77
6. Introduced into the standard international standard ISO 3650-78
7. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
|
Number of item, section |
|
|
GOST 2.601-95 | |
|
GOST 8.001-80 | |
|
GOST 8.326-89 | |
|
GOST 8.367-79 | |
|
GOST 8.383-80 | |
|
GOST 2789-73 | |
|
GOST 2999-75 | |
|
GOST 4119-76 | |
|
GOST 9391-80 | |
|
GOST 13762-86 |
2.20.2, 2.21.1, sec. 5 |
|
1.3, 2.19, 3.1, 3.3-3.5, 4.1 |
|
|
TU 3-3.2123-88 | |
8. The validity period was lifted according to Protocol No. 5-94 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-12-94)
9. REISSUE (March 1998) with Change No. 1, approved in June 1996 (IUS 9-96)
Editor GS Sheko Technical editor NS Grishanova Proofreader A/I Pershina Computer layout LL Circular
Issued by persons No. 021007 dated 10 08 95 Handed over to the set 17 03 98 Signed for printing 13 04 98 Uel print l 1.86 Uch-izdl 1.15
Circulation 231 copies S460 Zak 304
IPK Publishing House of Standards, 107076, Moscow, Kolodezny Lane, 14 Typed at the Publishing House on a PC
Branch of IPK Publishing House of Standards - type “Moscow Printer”, Moscow, Lyalin lane, 6
Serve to transfer dimensions from the standard to the product. In mechanical engineering and other industries they are used for the following purposes:
- According to GOST 9038-83, gauge blocks (abbr. KMD) are made in the form of a rectangular parallelepiped with two mutually parallel flat measuring surfaces. storage and transfer of a unit of length;
- caliber verification;
- calibration and verification of various measures and measuring instruments;
- high-precision marking and jig boring work;
- determining the dimensions of devices and products;
- adjustment of machines, tools, etc.
Nominal size of KMD
The size of a plane-parallel CMD is taken to be its median length l (Fig. b). The median length is determined by a perpendicular lowered from the middle of one of the measuring surfaces of the KMD to the opposite surface. The nominal size of the median length l affects the determination of the value of sides a and b in the cross-section of the measures.
For example, at 10 mm< l < 0,29 мм а=30 -0,28 ; b= -0,20 -0,30 ; при 10 мм < l < 250 мм а=35 -0,34 ; b= -0,20 -0,30 .
The nominal size of the median length is indicated on each length measure.
End blocks are manufactured in the following accuracy classes:
- steel 00; 01; 0; 1; 2; 3;
- carbide 00; 0; 1; 2 and 3.
The most accurate is class 00.
Sets of gauge blocks
According to GOST, plane-parallel gauge blocks can be assembled into sets according to their number and dimensions of nominal length. The number of KMD in sets from No. 1 to No. 19 varies from 2 to 112 pieces. Set No. 20 provides 23 length measures, No. 21 - 20 measures, No. 22 - 7.
The sets are completed in such a way that from a minimum amount of CMD it is possible to create a block of any size up to the third decimal place. Based on this requirement, the nominal dimensions of plane-parallel CMDs and the gradation of their sizes are selected.
The standard gradation in sets of gauge blocks looks like this: 0.001; 0.01; 0.1; 0.5; 1; 10; 25; 50 and 100 mm.
Nominal lengths of KMD range from 1.005-100 mm. For example, a set of 112 gauge blocks includes:
- length measure 1.005 mm - 1 pc.;
- 1-1.5 mm in 0.01 mm - 51 pcs.;
- 1.6-2 mm every 0.1 mm - 5 pcs.;
- 0.5 mm - 1 pc.;
- 2.5-25 mm every 0.5 mm - 46 pcs.;
- 30-100 mm every 10 mm - 8 pcs.
A separate length measure with the lowest accuracy class determines the accuracy class of the set. The nominal length of each length measure and the deviation are indicated in the passport, which is attached to the KMD set.
CMD digits
Based on the error in measuring the length of gauge blocks (certification error) and their deviation from parallelism and flatness, the CMD is divided into 5 categories, designated 1, 2, 3, 4, 5. The smallest certification error is characteristic of the 1st category. The error values are indicated in the length measurement certificate.
Actual deviations in the certificate of measures for which the category is established are taken into account when determining the size of a block of tiles along with the nominal value of the measures.
KMD blocks
The reason for the widespread use of gauge blocks in industry is their main property - grindability. KMD are able to firmly adhere when one measure is pushed onto another or applied (Fig. c).
Cohesion (or adhesion) of CMD is ensured by molecular adhesive forces in the presence of an ultra-thin film of lubricant between the measures - from 0.05 to 0.1 microns. The minimum shear force of one length measure relative to another is 30...40 N, for new KMD the force values are 10...20 times higher. According to the standard, steel gauge blocks are designed for 500 laps with a probability of failure-free operation of 0.8, carbide - 30 thousand laps with a probability of 0.9.
A block of a given size is composed of the smallest possible number of measures. First, CMD is selected that allows one to obtain thousandths of a millimeter, then hundredths, tenths and whole millimeters.
For example, to get a block measuring 28.495 mm, you need to take length measures 1.005 from KMD set No. 1, then 1.49, 6 and 20: 1.005+1.49+6+20=28.495 mm.
The minimum number of gauge blocks in a block will increase its accuracy, since the total error will decrease. The reliability of the unit also increases, i.e. the likelihood of its destruction is reduced. The number of KMD in a block should not exceed 5 pieces.
The use of the following accessories allows you to significantly expand the scope of application of CMD:
KMD material
Gauge gauges are made mainly of steel with a temperature coefficient of expansion of (11.5±0.1)10 -6 mm per 1°C with temperature changes from 10 to 30°C. Chromium steels X, 20KhG, ShKh15, KhG have these characteristics.
The hardness of the measuring surfaces of such length measures is at least HRC 62. Less commonly, CMD is made from a hard alloy of the VK6M brand with a temperature expansion coefficient of 3.6.10 -6 mm per 1°C. The wear resistance of such measures increases by 10-40 times compared to steel ones. However, it should be taken into account in the work that due to the difference in temperature coefficients, significant errors in measurement with steel and carbide CMDs may occur.
High wear resistance and good grindability of gauge blocks are achieved with a roughness of measuring surfaces of no more than 0.063 microns according to the Rz criterion and a roughness of non-working surfaces of Ra 0.63 microns.
The average shelf life of steel KMD is from 1 year, carbide - from 2 years.
GOST 9038-90
Group P51
INTERSTATE STANDARD
END LENGTH MEASURES, PARALLEL
Gauge blocks. Specifications
ISS 17.040.30
OKP 39 3200
Date of introduction 1991-07-01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Machine Tool and Tool Industry of the USSR
DEVELOPERS
A.M. Smogorzhevsky, N.A. Mikhailova
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Product Quality Management and Standards dated January 25, 1990 N 86
Change No. 1 was adopted by the Interstate Council for Standardization, Metrology and Certification (Minutes No. 4 of October 21, 1993)
The following voted for adoption:
State name | Name of the national standardization body |
Republic of Armenia | Armgosstandard |
Republic of Belarus | State Standard of Belarus |
The Republic of Kazakhstan | Gosstandart of the Republic of Kazakhstan |
The Republic of Moldova | Moldovastandard |
Russian Federation | Gosstandart of Russia |
Turkmenistan | home state inspection Turkmenistan |
The Republic of Uzbekistan | Uzgosstandart |
State Standard of Ukraine |
3. INSTEAD GOST 9038-83
4. The standard fully complies with ST SEV 720-77
5. The international standard ISO 3650-78* has been introduced into the standard
________________
* Access to international and foreign documents can be obtained by following the link to the website http://shop.cntd.ru. - Database manufacturer's note.
6. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
Number of item, section |
|
GOST 2.601-95 | |
GOST 8.001-80 | |
GOST 8.326-89 | |
GOST 8.367-79 | |
GOST 8.383-80 | |
GOST 2789-73 | |
GOST 2999-75 | |
GOST 4119-76 | |
GOST 9391-80 | |
GOST 13762-86 | 2.20.2, 2.21.1, section 5 |
MI 1604-87 | 1.3, 2.19, 3.1, 3.3-3.5, 4.1 |
MI 2079-90 | |
MI 2186-92 | |
TU 3-3.2123-88 | |
RD 50-98-86 |
7. The validity period was lifted according to Protocol N 5-94 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-12-94)
8. EDITION (February 2004) with Amendment No. 1, approved in June 1996 (IUS 9-96)
This standard applies to plane-parallel gauge blocks (hereinafter referred to as gauge blocks) made of steel up to 1000 mm long and hard alloy up to 100 mm long, having the shape of a rectangular parallelepiped with two flat mutually parallel measuring surfaces.
End blocks are intended to be used as:
working measures for adjusting and configuring indicating measuring instruments and for direct measurement of the linear dimensions of industrial products;
standard measures for transferring the size of a unit of length from the primary standard to gauge measures of lesser accuracy and for checking and calibrating measuring instruments.
The requirements of this standard are mandatory.
1. MAIN PARAMETERS AND DIMENSIONS
1.1. must correspond to those indicated in Table 1.
Table 1
Graduation of gauge blocks | Nominal lengths of gauge blocks |
||||||
1.2. End gauges must be manufactured in the following accuracy classes: 0; 1; 2; 3 - made of steel; 0; 1; 2 and 3 - made of hard alloy.
Note. End gauges made of steel and hard alloy of accuracy classes 00 and 01 are manufactured by agreement between the consumer and the manufacturer.
1.3. End gauges, when used as reference gauges, must be verified as reference grades 1, 2, 3 and 4 according to MI 1604. The gauge gauges must have a distinctive sign when released from production.
1.4. End gauges should be sent in sets (see Appendix 2), special sets (see Appendix 3) or individual measures and sets of sets (see Appendix 4).
Note. The accuracy class of a set is determined by the lowest class of an individual measure included in the set. The 1.005 mm gauge block, included in sets 1, 2, 3, 12 and 15 of the 3rd accuracy class, must be no lower than the 2nd accuracy class.
1.2-1.4. (Changed edition, Amendment No. 1).
1.5. The cross-sectional dimensions of the end gauges (, ) must correspond to those indicated in Table 2.
table 2
Nominal lengths of gauge blocks | Cross section size |
||||
Examples of symbols:
Set N 2 gauge blocks made of steel accuracy class 1:
End blocks 1-N2 GOST 9038-90
Set N 3 of carbide gauge blocks, accuracy class 2:
End blocks 2-N3-T GOST 9038-90
Gauge block 1.49 mm long made of steel accuracy class 3:
End gauge 3-1.49GOST 9038-90
Set of standard gauge blocks of the 1st category:
End gauges exemplary 1-KO GOST 9038-90
Set N 3 standard gauge blocks of the 2nd category:
Exemplary end blocks 2NO3 GOST 9038-90.
(Changed edition, Amendment No. 1).
2. TECHNICAL REQUIREMENTS
2.1. End gauges must be manufactured in accordance with the requirements of this standard according to working drawings approved in the prescribed manner.
2.2. Permissible deviations of the length of gauge blocks from the nominal at a temperature of 20 ° C and deviations from plane-parallelism of the measuring surfaces should not exceed the values specified in Table 3.
Table 3
Permissible deviations |
|||||||||||||||
length from the nominal value ±, µm, for accuracy classes | from plane-parallelism, µm, for accuracy classes |
||||||||||||||
These requirements do not apply to a zone 0.5 mm wide at the edges of the measuring surface, counting from non-working surfaces - for measures with a nominal length of up to 0.29 mm inclusive and 0.8 mm - for measures with a nominal length of more than 0.29 mm.
2.3 Deviations from the flatness of the measuring surfaces of gauge blocks with a length of over 0.9 to 3 mm in a free (unground) state should not exceed 2 µm.
2.4. The grindability of the measuring surfaces of the gauge blocks must meet the requirements specified in Table 4.
Table 4
Gauge blocks accuracy class | Grindability of gauge blocks to bottom glass flat plates with a diameter of 60 mm according to TU 3-3.2123* | Lappability of gauge blocks to each other |
|
made of steel, length from 0.6 to 100 mm | made of hard alloy, length from 0.99 to 100 mm |
||
Free of interference fringes and tints when viewed in white light | Shear force from 29.4 to 78.5 N | ||
Shear force from 29.4 to 98.1 N |
|||
1; 2 and 3 | No interference fringes. Shades in the form of light spots observed in white light are allowed | ||
________________
* Specifications mentioned here and further in the text are the author’s development. Behind additional information refer to the link. - Database manufacturer's note.
Flatness tolerance of glass plates is 0.03 microns - for accuracy classes 00, 01 and 0; 0.1 µm - for accuracy classes 1, 2 and 3.
2.5. The roughness parameter of the measuring surfaces of gauge blocks is 0.063 microns according to GOST 2789.
2.6. The edges of the measuring surfaces of gauge blocks must be rounded to a radius not exceeding 0.3 mm, or chamfered not more than 0.3 mm.
There should be no defects on the measuring surfaces of the gauge blocks, including in the area where the chamfers transition into the measuring surface, that would negatively affect the use of the gauge blocks.
Scratches are allowed on the measuring surfaces of gauge blocks that do not affect grindability (clause 2.4) or the deviation of length from the nominal value and from plane-parallelism (clause 2.2).
2.7. (Deleted, Amendment No. 1).
2.8. On the measuring surfaces of gauge blocks made of hard alloy at a distance of up to 1 mm from the center of the measuring surface and at corner points at a distance of 1-2 mm from the non-working surfaces of gauge blocks of accuracy classes 00, 0, the presence of pores more than 120 microns in width and gauge blocks of accuracy classes 1 is not allowed , 2 and 3 - pores more than 200 microns in width. The degree of porosity should not be higher than 0.4% according to GOST 9391.
2.9. The temperature coefficient of linear expansion of steel gauge block material per 1 m and 1 °C should be in the range of 10.5-12.5 microns at temperatures from 10 to 30 °C.
2.10. Gauge blocks made of hard alloy must have a temperature coefficient of linear expansion at temperatures from 10 to 30 °C in accordance with Table 5 and be made entirely of hard alloy or steel with measuring surfaces equipped with hard alloy.
Table 5
Nominal lengths of gauge blocks, mm | Temperature coefficient of linear expansion of gauge blocks, µm, per 1 m and 1 °C | Gauge blocks accuracy class |
|||
In the passport of gauge blocks made of carbide, the manufacturer must indicate the value of the temperature coefficient of linear expansion of the gauges corresponding to the grade of carbide used in the set.
2.11. The hardness of the measuring surfaces of steel gauge blocks must be at least 800 HV according to GOST 2999.
2.12. (Deleted, Amendment No. 1).
2.13. The change in the length of the end blocks during the year due to instability of the material should not exceed the values given in Table 6.
Table 6
Gauge blocks accuracy class | Allowable change in length of measure (mm) during the year, µm |
0,02+0,0002 |
|
0,02+0,0005 |
|
Requirements for the stability of end blocks over time must be ensured by the manufacturer, provided that the end blocks have not been subjected to sudden temperature influences, vibrations and shocks, as well as the influence of magnetic fields, excluding the earth's magnetic field.
(Changed edition, Amendment No. 1).
2.14. The tolerance for perpendicularity of non-working surfaces relative to the measuring surfaces must correspond to that specified in Table 7.
Table 7
Nominal lengths of gauge blocks, mm | Tolerance of perpendicularity of non-working surfaces relative to the measuring surfaces along the length of the gauge block, µm |
|||
2.15. On the non-working surfaces of gauge blocks with a nominal length of more than 100 mm, strokes must be applied at a distance of 0.211 from the ends of the gauge.
2.16. To connect measures into blocks with ties in accordance with GOST 4119, end measures included in sets No. 8 and 9, as well as end measures over 100 mm long in sets No. 22-24 must have two holes; protective measures 50 mm and end measures 51.4 and 71.5 mm in sets N 22-24 - one hole.
The holes should be located at a distance of 25 mm from the measuring surfaces, and measures 51.4 and 71.5 mm from one of the measuring surfaces.
2.17. (Deleted, Amendment No. 1).
2.18. Explanations of terms used in this standard are given in Appendix 1.
2.19. Each set of gauge blocks and a set of kits must be packed in a case, to which is attached a passport in accordance with GOST 2.601*, and for standard gauge blocks, an inspection certificate in accordance with MI 1604.
________________
* In the territory Russian Federation the document is not valid. GOST 2.601-2006 is in force. - Database manufacturer's note.
(Changed edition, Amendment No. 1).
2.20. Marking
2.20.1. Each end gauge must be marked with its nominal length. On gauge blocks with a length of 5.5 mm or less, the value of the nominal length should be as far as possible from the middle of the measuring surface so that in its central part a zone 9 mm long remains free from inscriptions.
On gauge blocks longer than 5.5 mm, the nominal length value and the manufacturer's trademark must be applied to the non-working surface. In addition to the above markings, protective and exemplary measures must bear a distinctive sign. On gauge blocks of accuracy classes 00, 01 and 0 it is allowed to mark the set number or other additional marking.
2.20.2. Marking on the case is in accordance with GOST 13762.
The following must be marked on the case of each set:
trademark of the manufacturer (on the outer surface of the lid);
serial number of the set or kit;
accuracy class (for working gauge blocks); discharge (for standard gauge blocks); the inscription “example gauges” (on the outer surface of the cover of the case of the set or set of exemplary gauge blocks);
designation of this standard;
letter "T" (for carbide sets) on the inner surface of the case.
For each socket in which the gauge block is placed, the values of the nominal length should be indicated.
2.20.1, 2.20.2. (Changed edition, Amendment No. 1).
2.21. Package
2.21.1. End gauges in sets and end gauges with a length of 500 to 1000 mm, sent separately, must be packed in cases made of materials in accordance with GOST 13762.
Each gauge block in the set must be inserted into the appropriate slot and not fall out of it when the closed case is turned over.
3. ACCEPTANCE
3.1. To check the compliance of the end blocks with the requirements of this standard, state tests, metrological certification (for exemplary end blocks), acceptance control, periodic tests and tests for compliance of the measures are carried out for the temperature coefficient of linear expansion of the material of the end blocks (clauses 2.9 and 2.10) and for length stability end measures in time (clause 2.13 - for working measures, clause 1.6 MI 1604 - for standard measures).
Tests according to clauses 2.9, 2.10 and 2.13 are allowed, as well as tests according to clause 1.6 of MI 1604 can be combined with periodic ones.
3.2. State tests - according to GOST 8.383* and GOST 8.001*.
Metrological certification - according to GOST 8.326*.
________________
* PR 50.2.009-94 applies on the territory of the Russian Federation.
The document is not valid on the territory of the Russian Federation. No longer in force on the basis of Order of the Ministry of Industry and Trade of Russia dated November 30, 2009 N 1081. The Procedure for testing reference materials or measuring instruments for the purpose of type approval, the Procedure for approving the type of reference materials or the type of measuring instruments, The procedure for issuing certificates of approval of the type of reference materials or type of instruments are in force measurements, establishing and changing the validity period of the specified certificates and the interval between verifications of measuring instruments, Requirements for approval marks of the type of standard samples or the type of measuring instruments and the procedure for their application. - Database manufacturer's note.
3.1, 3.2. (Changed edition, Amendment No. 1).
3.3. During acceptance inspection, each end gauge is checked for compliance with the requirements of clauses 2.2, 2.3, 2.4 (regarding the abrasion of the gauges to glass plates), 2.8 and 2.14-2.16.
Clause 2.5 and clause 2.4 (in terms of shear force) are checked selectively in accordance with MI 1604.
3.4. Periodic tests are carried out at least once every three years for compliance with all the requirements of this standard, except for clauses 2.9, 2.10, 2.13 and clause 1.6 of MI 1604. Periodic tests should be carried out on typical representatives:
on any one set of gauge blocks up to 100 mm long made of steel of any accuracy class and (or) grade;
on any one set of gauge blocks over 100 mm long made of steel of any accuracy class and (or) grade;
on any one set of gauge blocks made of hard alloy of any accuracy class and (or) grade.
From each set, at least 10% of the end measures are selected from the total number in one set, but not less than four measures.
In a set of carbide end blocks that have steel end blocks, 10% of the carbide measures and 10% of the steel measures are selected for testing, but not less than four each of the carbide and steel measures.
The results of periodic tests are considered satisfactory if all measures tested meet all controlled requirements.
3.5. Tests according to clauses 2.9, 2.10 and 2.13 and clause 1.6 of MI 1604 are carried out at least once every three years, on at least four measures of each standard representative in accordance with clause 3.4 of this standard. When testing is combined with periodic testing, measures are selected from the sets selected for periodic testing.
Tests may be carried out on at least four separately manufactured measures of both carbide and steel.
Test results are considered satisfactory if all tested measures meet the requirements being tested.
3.4, 3.5. (Changed edition, Amendment No. 1).
3.6. (Deleted, Amendment No. 1).
4. CONTROL AND TEST METHODS
4.1. Verification of end blocks according to MI 2079, MI 2186, GOST 8.367 and MI 1604.
(Changed edition, Amendment No. 1).
4.2. The impact of environmental climatic factors during transportation is checked in climatic chambers. Tests are carried out in the following mode: at a temperature of plus (50±3) °C, minus (50±3) °C and at relative humidity (95±3)% at a temperature of (35±3) °C. Exposure in the climatic chamber in each mode is 2 hours. After testing, all tested measures must comply with the requirements of clause 2.2; 2.3; 2.4.
4.3. When checking the influence of transport shaking, an impact stand is used, which creates shaking with an acceleration of 30 m/s and a frequency of 80-120 beats per minute.
Boxes with packaged measures are attached to a stand and tested with a total number of impacts of 15,000. After testing, the metrological characteristics of the measures should not exceed the values provided by this standard.
5. TRANSPORTATION AND STORAGE
Transportation and storage - according to GOST 13762.
It is allowed to transport end blocks without packaging them in transport containers.
6. OPERATING INSTRUCTIONS
Operating conditions for end blocks are in accordance with RD 50-98.
7. MANUFACTURER WARRANTY
The manufacturer guarantees compliance of end blocks and their sets with the requirements of this standard, subject to the conditions of transportation, storage and operation.
Warranty period from the date of commissioning:
6 months - for measures and sets made of steel and for sets made of hard alloy, including measures made of steel;
18 months - for measures and sets made of carbide.
APPENDIX 1 (for reference). EXPLANATION OF TERMS USED IN THIS STANDARD
ANNEX 1
Information
Gauge length (at any point) | The length of the perpendicular dropped from a given point on the measuring surface of a gauge block to its opposite measuring surface. |
Note. The opposite measuring surface in the absolute interference method of measuring the length of measures is the surface of a flat auxiliary plate made of the same material and with a surface of the same quality as the end measure to which it is ground. |
|
Deviation of the length of the gauge block from the nominal value | The largest absolute value difference between the length of the gauge block at any point and the nominal length of the gauge block. |
Deviation from plane-parallelism of the gauge block | The difference between the longest and shortest lengths of the gauge block. |
End block grindability | A property of the measuring surfaces of a gauge block that ensures strong adhesion of the gauge blocks to each other, as well as to flat metal or glass plates when applying or sliding one gauge block onto another or a block block onto a plate. Lappability is characterized by shear force. |
Protective measure | A measure installed at the edge of the block of measures to protect the main measures from wear. |
Set of special measures | A set of measures intended for verification of certain products and measuring instruments (wires, micrometers, caliper tools, opticators). |
APPENDIX 2 (mandatory). SETS OF END PARALLEL LENGTH GAUGES
APPENDIX 2
Mandatory
Dial number | Number of measures in set | Gradation of measures, mm | Nominal lengths of measures, mm | Number of measures | Protective measures | Set accuracy class |
||||||
Nominal length, mm | Number of measures | of steel | carbide |
|||||||||
0; 1; 2 and 3 | ||||||||||||
0; 1; 2 and 3 | ||||||||||||
Note. End blocks in sets No. 1, 2 and 3 made of hard alloy with a length of over 5 mm may be replaced with end blocks made of steel.
APPENDIX 3 (recommended). SPECIAL SETS OF PLANE-PARALLEL LENGTH MEASURES
Nominal values of gauge blocks, mm | Set accuracy class | Set rank |
|
of steel | carbide | ||
Set N 20 (23 measures) | |||
0,12; 0,14; 0,17; 0,2; 0,23; 0,26; 0,29; 0,34; 0,4; 0,43; 0,46; 0,57; 0,7; 0,9; 1,0; 1,16; 1,3; 1,44; 1,6; 1,7; 1,9; 2; 3,5 | |||
Set N 21 (20 measures) | |||
5,12; 10,24; 15,36; 21,5; 25; 30,12; 35,24; 40,36; 46,5; 50; 55,12; 60,24; 65,36; 71,5; 75; 80,12; 85,24; 90,36; 96,5; 100 | |||
Set N 22 (7 measures) | |||
21,2; 51,4; 71,5; 101,6; 126,8; 150; 175 | |||
Set N 23 (13 measures) | |||
1,00; 1,00; 1,05; 1,10; 2,00; 2,00; 21,2; 51,4; 71,5; 101,6; 126,8; 150; 175 | |||
Set N 24 (25 measures) | |||
1,00; 1,00; 1,04; 1,05; 1,06; 1,10; 1,11; 1,12; 1,13; 1,17; 1,18; 1,19; 2,00; 2,00; 21,2; 51,4; 71,5; 101,6; 126,8; 150; 175; 250; 400; 600; 1000 | |||
Set N 25 (15 measures) | |||
0,990; 0,992; 0,994; 0,995; 0,996; 0,998; 1,000; 1,002; 1,005; 1,010; 1,015; 1,020; 1,030; 1,040; 1,050 | |||
Set N 26 (8 measures) | |||
0,990; 0,995; 1,000; 1,005; 1,010; 1,020; 1,030; 1,050 | |||
Set N 27 (9 measures) | |||
1,00; 1,02; 1,04; 1,05; 1,06; 1,08; 1,10; 1,15; 1,20 | |||
Set N 28 (28 measures) | |||
1,00; 1,02; 1,04; 1,06; 1,08; 1,10; 1,12; 1,14; 1,16; 1,18; 1,20; 1,24; 1,28; 1,30; 1,32; 1,36; 1,40; 1,50; 1,60; 1,70; 1,80; 1,90; 2,0; 2,2; 2,4; 2,6; 2,8; 3,0 | |||
Set N 29 (8 measures) | |||
0,990; 0,995; 1,000; 1,005; 1,010; 1,020; 1,030; 1,040 | |||
Set N 30 (7 measures) | |||
5,12; 10,24; 15,36; 19,50; 20; 21,50; 25 | |||
Set N 31 (9 measures) | |||
1; 1,01; 1,02; 1,03; 1,04; 1,05; 1,06; 1,08; 1,10 | |||
Set N 32 (7 measures) | |||
0,995; 1; 1,005; 1,010; 1,020; 1,030; 1,040 | |||
Set N 33 (7 measures) | |||
1; 1,06; 1,10; 1,12; 1,18; 1,20; 1,30 | |||
Set N 34 (9 measures) | |||
1,001; 1,002; 1,003; 1,005; 1,006; 1,007; 1,008; 1,009 | |||
Set N 35 (9 measures) | |||
1,01; 1,02; 1,03; 1,04; 1,05; 1,06; 1,07; 1,08; 1,09 | |||
Set N 36 (13 measures) | |||
1; 1,001; 1,002; 1,003; 1,004; 1,005; 1,006; 1,010; 1,020; 1,030; 1,040; 1,050; 1,060 | |||
Set N 37 (8 measures) | |||
1 - 2 pcs.; 10 - 2 pcs.; 50 - 2 pcs.; 100 - 2 pcs. | |||
Note. End blocks in sets No. 23 and 24 made of hard alloy with a length exceeding 5 mm may be replaced with end blocks made of steel.
APPENDIX 3. (Changed edition, Amendment No. 1).
APPENDIX 4 (recommended). SET OF EXAMPLE LENGTH GAUGE SETS
Dial number | |
3, 10, 11, 16, 17, 20, 21 |
APPENDIX 4. (Introduced additionally, Amendment No. 1).
ROSSTANDART FA on technical regulation and metrology
NEW NATIONAL STANDARDS: www.protect.gost.ru
FSUE STANDARDINFORM provision of information from the Russian Products database: www.gostinfo.ru
FA ON TECHNICAL REGULATION"Dangerous goods" system: www.sinatra-gost.ru
Plane-parallel end length measures
Plane-parallel gauge blocks are designed to convey dimensions from the length of the main light wave to the product. Gauge blocks are the most precise measuring instruments used in industry for controlling dimensions, checking and calibrating measures, measuring instruments and tools, for checking gauges, establishing the correct dimensions in the manufacture of tools, fixtures and dies, as well as for particularly precise marking and adjustment work machine tools
To protect steel gauge blocks in blocks used for direct measurements of tools, fixtures and other products, protective gauge blocks are recommended as a last resort in blocks. Thus, the main gauge blocks protect against premature wear that is inevitable when in contact with the object being measured.
Gauge gauges are made of chromium steel with high quality finishing of measuring surfaces, with good grindability (adhesive force is from 3 to 8 kgf) and have high wear resistance.
The gauge blocks have the shape of a rectangular parallelepiped with two flat, mutually parallel measuring surfaces.
End gauges are made of steel and hard alloy.
Gauge gauges have high wear resistance and provide good adhesiveness to glass plates and to each other.
End gauges are used individually or in blocks by lapping several gauges together.
End gauges are produced in sets. Sets of gauge blocks differ in the number and nominal sizes of gauge blocks.
End gauges are produced in 4 accuracy classes: 0, 1, 2 and 3.
Control and measuring instruments (instruments) are equipment without which it is impossible to imagine today modern production. Measurements are required at every production stage and in a wide variety of industrial applications. That’s why the measuring instruments are so diverse, these include end length measures (KMD) GOST 9038-90, micrometers, mikators, calibration and measuring rulers, pedometers, inclinometers, thickness gauges, hardness gauges, microscopes, calipers, etc.
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