In case of failure or improper performance by the seller of his duties...
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STATE STANDARD
USSR UNION
ROLLING BEARINGS
BALLOONS
When checking with a circular meter, measurements should be carried out in at least two mutually perpendicular planes. The results obtained should not exceed the values indicated in the table. 2.
It is allowed to control sphericity in a prism. The obtained measurement results should not be more than those indicated in the table. 2 of this standard.
In case of disagreement in determining deviations from sphericity, the arbitration method is to check on a device that shows the actual values.
4.7. Detection of secondary hardening and secondary tempering spots is carried out by cold etching in a nitric acid solution.
After etching, there should be no clearly defined spots of secondary hardening or secondary tempering on the balls.
4.8. The balls are tested for destruction according to the diagram shown in the drawing.
4.9. The compression test of the balls is carried out between steel pads with a hardness of HRC 58...63 with spherical depressions. The sphere of the recess is outlined with a radius equal to 2/3 of the diameter of the ball. Exposure time 30 s. The balls must be subjected to compression in three mutually perpendicular directions. A compression test is carried out before the final machining balls.
4.10. The surface roughness of the balls is controlled by measurements using instruments. It is possible to control the roughness by comparison with working samples.
4.11. Inspection of nicks, dents and scratches is carried out with the naked eye in diffused light by comparison with samples.
5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE
5.1. To protect against corrosion, the balls must be preserved and stored in conditions that comply with GOST
At the request of the consumer, it is allowed to use preservation methods and storage conditions not provided for by GOST
5.2. Balls of the same batch, except those intended for own production, are packed in a box after preservation.
GOST 3722-81boxes made of cardboard, lined with waxed paper or plastic film, or plastic boxes, and then into boxes according to GOST 16148-79. It is allowed to use other types of transport containers that ensure the safety of the internal packaging, do not allow droplets of liquid moisture to get inside and do not release corrosive substances.
The boxes must be lined from the inside with bituminous paper in accordance with GOST 515-77 or polymer film in accordance with GOST 16272-79, GOST 10354-73 or other materials (paper, film, etc.) that ensure the safety of the balls.
5.3. After preservation, balls weighing more than 1.3 kg are wrapped in moisture-proof material and packed in individual boxes.
After preservation, balls with a diameter of up to 1.5 mm are packaged in plastic tubes and then in boxes. It is allowed to pack test tubes in one box and boxes with balls of the same nominal diameter, the same degree of accuracy, but with different deviations in the average diameter of the balls, in one box.
Balls with a diameter of over 20 mm may be packed in boxes without boxes.
The balls must be placed tightly in a box or test tube so that they do not move during transportation.
5.4. The weight of the box with packed balls should not exceed 50 kg. After filling, the boxes must be covered with a steel strip.
5.5. A passport is inserted into each box or test tube with balls, which must indicate:
symbol of balls;
average deviation from the nominal diameter of the balls in pairs
TII AD«,mL i
mass or number of balls;
preservation date (month, year);
5.6. After placing the balls in them, the boxes can be covered with a parcel post. The parcel or box must indicate:
name or trademark manufacturer;
symbol of balls;
average deviation from the nominal diameter of balls in batch A DwmL ;
mass or number of balls; preservation date (month, year).
Note. It is allowed to replace the parcel with other packaging means that ensure the safety of the packaging. In this case, the data given in clause 5.5 must be printed on the box or label.
5.7. The boxes must be packed tightly into the box to prevent them from moving during transportation.
The voids in the box should be filled with paper or cardboard waste.
5.8. Each box must contain a passport indicating:
name or trademark of the manufacturer; symbol of balls; mass or number of balls; preservation date (month, year);
stamp technical control manufacturer.
5.9. Transport markings (main, additional, informational inscriptions and handling signs) must be applied to the label or directly to the box in accordance with GOST 14192-77.
Additionally, you should indicate:
name or trademark of the manufacturer; symbol of balls; number or mass of balls;
manipulation signs: “Caution, fragile!” “Afraid of dampness” according to GOST 14192-77.
5.10. Balls should be transported by means that ensure their safety and protection from precipitation. It is allowed to transport balls in packages from boxes, laid according to a certain pattern on a pallet or without it, covered with metal tape or other material that ensures the shape of the package remains unchanged during transportation.
5.11. The consumer should store the balls in the warehouse only in the packaging of the manufacturer. The warehouse premises must have a constant temperature (20±5)°C and a relative humidity of no more than 70%.
b. MANUFACTURER'S WARRANTY
6.1. The manufacturer must ensure that the balls comply with the requirements of this standard, subject to the conditions of transportation and storage.
6.2. Guarantee period Storage of balls is 24 months from the date of manufacture.
APPENDIX 1 Reference
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TERMS USED IN THIS STANDARD AND EXPLANATIONS FOR THEM |
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Described sphere |
APPENDIX 2 Mandatory
NOMOGRAMS OF BREAKING LOADS
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Ball diameter, mm | ||
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Lio Sharin meter, mm |
Editor I. M. Uvarova Technical editor O. N. Nikitina Proofreader G. M. Frolova
Delivered to the embankment 05/07/81 Subp to furnace 01 09 8] 1.0 p l 0.92 academic edition l. Shooting range 30000 Price 5 kopecks.
Orlena "Badge of Honor" Publishing house of standards. 123557. Moscow. Novopresnensky lane, 3 Type. "Moscow Printer" Moscow, Lyalin per., 6 Zak 793
Group G16
UDC 621.82271:006.354
STATE STANDARD OF THE USSR UNION
GOST
Rolling bearings A A
(ST SEV 1990-79)
balls 3722-81
Specifications
Rolling bearings. Balls.
Technical requirements
OKP 46 9100 GOST 3722-60
Resolution State Committee USSR according to standards dated April 17, 1981 No. 2013, the validity period is established
from 07/01/1983 to 07/01/1988
Failure to comply with the standard is punishable by law
This standard applies to balls used in rolling bearings and as separate parts.
Terms, designations and explanations for them are given in reference Appendix 1.
The standard fully complies with ST SEV 1990-79.
1. MAIN DIMENSIONS
1.1. The dimensions and weight of the balls must correspond to the values indicated in the table. 1.
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Table 1 |
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Reproduction is prohibited © Standards Publishing House, 1981
Official publication
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Continuation of the table. 1 |
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Continuation of the table. 1 |
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Notes: 1. The dimensions of the nominal diameters of the balls in millimeters, indicated in brackets, are not recommended for use. 2. Ball nominal diameters in inches are for reference only. 3. The mass of the balls is calculated at a steel density of 7.85 kg/dm 3 . |
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1.2. The designation of balls used as individual parts must consist of the nominal diameter in millimeters, the degree of accuracy and the designation of this standard.
The symbol for balls used in rolling bearings is supplemented by the letter H, placed before the designation of the nominal diameter.
GOST 3722-81The symbol for balls that are not sorted by diameter is supplemented with the letter B before the designation of the nominal diameter.
Examples symbols balls used in the form of individual parts, with a nominal diameter of 5.8 mm, degree of accuracy 10:
The same, balls used in rolling bearings, with a nominal diameter of 3.969 mm, accuracy degree 5:
The same, balls not sorted by diameter, with a nominal diameter of 9.525 mm, degree of accuracy 100:
1.3. At the customer's request, it is possible to produce balls of sizes different from those indicated in the table. 1, while ensuring the remaining requirements of this standard.
2. TECHNICAL REQUIREMENTS
2.1. Balls must be manufactured in accordance with the requirements of this standard according to working drawings approved in the prescribed manner.
2.2. The balls must be made of steel in accordance with GOST 801-78 and GOST 4727-67. Upon customer request, it is possible to manufacture balls from other steel grades.
2.3. The balls must be heat treated:
up to hardness HRC 62 ... 66 - with a diameter of up to 45 mm;
up to hardness HRC 60 .. 66 - with a diameter of more than 45 mm.
2.4. There are 10 degrees of ball accuracy, designated in order of decreasing accuracy by numbers: 3; 5; 10; 16; 20; 28; 40; 60; 100; 200.
2.5. The deviation of the average diameter, the different sizes of balls in diameter in a batch, the variability of the unit diameter, the deviation from the spherical shape (without taking into account waviness) and the surface roughness should not exceed the values indicated in the table. 2.
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table 2 |
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Notes:
1. Roughness values Rr are established for balls of the 3rd degree of accuracy of all diameters: For balls of other degrees of accuracy with Dw ^ 3 mm.
2. At the customer’s request, it is allowed to produce balls used in the form of separate parts with maximum deviations that differ from those indicated in the table. 2.
2.6. Deviations of the average diameter of balls of all degrees of accuracy used in rolling bearings are given in Table. 3.
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Table 3 |
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2.7. The balls must not have cracks, corrosion, or grinding annealing in the form of spots of secondary hardening and secondary tempering.
Not allowed are nicks, cavities, dents and risks visible to the naked eye with a normal level of vision under illumination of 300 lux from a distance of 0.5 m, as well as traces of decarburization identified by cold etching or flaw detection.
2.8. The balls must be demagnetized.
2.9. Balls with a diameter of 3 to 45 mm must withstand the breaking load test.
The breaking loads when testing balls must be no less than those indicated in the table. 4 for the diameters given therein; for balls with other nominal diameters, the breaking loads must be no less than those established in mandatory Appendix 2.
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Table 4 |
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2.10. Balls with a diameter greater than 45 mm must withstand a compression test. The test load during compression and the change in the diameter of the ball under the influence of this load, depending on the size of the ball, must correspond to the values indicated in the table. 5.
Table 5
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3. ACCEPTANCE RULES |
3.1. An acceptance inspection should be carried out to verify that the balls comply with the requirements of this standard.
3.2. During acceptance inspection, balls are checked for compliance with:
clause 2.2-0.03% of the lot (for balls with a diameter of up to 45 mm - no less than 5 pcs. and no more than 10 pcs.);
for balls with a diameter over 45 mm - at least 2 pcs. and no more than 5 pieces;
pl. 2.4 and 2.6-0.1% of the lot, but not less than 5 pcs. and no more than 50 pieces;
p. 2.7-0.03% of the lot, but not less than 5 pcs. and no more than 50 pieces;
table 4-3 pcs. from the party.
3.3. If the balls do not comply with at least one requirement of this standard, re-inspection of a double number of balls taken from the same batch is carried out according to the same parameters.
The results of re-inspection apply to the entire batch.
4. CONTROL METHODS
4.1. The quality of the heat treatment of the balls is checked by hardness.
4.2. The hardness of balls with a diameter of 5 mm or more is controlled according to GOST 9013-59 on a Rockwell device, scale C, by
GOST 3722-81pressing a diamond cone into a spherical surface. The actual hardness of balls with a diameter from 5 to 15.1 mm is determined taking into account the correction for the distorting effect of the curvature of the controlled surface according to table. 6.
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Table b |
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Note. Actual hardness of balls, nominal sizes which are not listed in the table. 6 is determined by interpolation. |
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4.3. The hardness of balls with a diameter of less than 5 mm is checked by the type of fracture to ensure compliance with the standard.
4.4. The hardness of balls with a diameter of 5 to 10 mm is checked at three points, and those over 10 mm are checked at five points.
4.5. The average diameter and diameter variability are measured by rotating the ball.
It is allowed to measure the average diameter D wm and the variability of the unit diameter D ws of balls of degrees of accuracy 3 and 5 of all diameters and balls of nominal diameters D w ^: 6 mm of other degrees of accuracy without rotation, but not less than in three arbitrary positions.
4.6. The measurement of the deviation from the sphericity of the balls is carried out on a device that shows the actual values.
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GOST 3722-81
(ST SEV 1990-79)
Group G16
STATE STANDARD OF THE USSR UNION
Rolling bearings
BALLOONS
Specifications
Rolling bearings. Balls.
Specifications
Date of introduction 1983-07-01
ENTERED INTO EFFECT by resolution of the USSR State Committee on Standards dated April 17, 1981 N 2013
Verified in 1987. By Decree of the USSR State Standard dated 12/17/87 N 4583, the validity period was extended until 07/01/93*
* The validity period was removed by the Decree of the State Standard of Russia dated 27.0792 N 781. (IUS N 10, 1992).
INSTEAD GOST 3722-60
REISSUE. January 1990
This standard applies to balls used in rolling bearings and as separate parts.
Terms, designations and explanations for them are given in Appendix 1.
The standard fully complies with ST SEV 1990-79.
1. MAIN DIMENSIONS
1.1. The dimensions and weight of the balls must correspond to the values indicated in Table 1.
Table 1
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Nominal ball diameter |
Weight 1000 pcs., kg |
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Notes:
1. The dimensions of the nominal diameters of the balls in millimeters, indicated in brackets, are not recommended for use.
2. Ball nominal diameters in inches are for reference only.
3. The mass of the balls is calculated at a steel density of 7.85 kg/dm.
1.2. The designation of balls used as individual parts must consist of the nominal diameter in millimeters, the degree of accuracy and the designation of this standard.
The symbol for balls used in rolling bearings is supplemented by the letter H, placed before the designation of the nominal diameter.
The symbol for balls that are not sorted by diameter is supplemented with the letter B before the designation of the nominal diameter.
Examples of symbols for balls used in the form of individual parts, with a nominal diameter of 5.8 mm, degree of accuracy 10:
Ball 5.8-10 GOST 3722-81
The same, balls used in rolling bearings, with a nominal diameter of 3.969 mm, accuracy degree 5:
Ball N 3.969-5 GOST 3722-81
The same, balls not sorted by diameter, with a nominal diameter of 9.525 mm, degree of accuracy 100:
Ball B 9.525-100 GOST 3722-81
1.3. At the customer's request, it is allowed to produce balls of sizes different from those indicated in Table 1, provided that the remaining requirements of this standard are met.
2. TECHNICAL REQUIREMENTS
2.1. Balls must be manufactured in accordance with the requirements of this standard according to working drawings approved in the prescribed manner.
2.2. The balls must be made of steel in accordance with GOST 801-78 and GOST 4727-83. Upon customer request, it is possible to manufacture balls from other steel grades.
2.3. The balls must be heat treated:
to hardness - with a diameter of up to 45 mm;
to hardness - with a diameter of more than 45 mm.
2.4. There are 10 degrees of ball accuracy, designated in order of decreasing accuracy by numbers: 3; 5; 10; 16; 20; 28; 40; 60; 100; 200.
2.5. The deviation of the average diameter, the different sizes of balls in diameter in the batch, the variability of the unit diameter, the deviation from the spherical shape (without taking into account waviness) and the surface roughness should not exceed the values specified in Table 2.
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NE>No. STATE COUNCIL FOR STANDARDIZATION, METROLOGY AND CERTIFICATION
INTERSTATE COUNCIL FOR STANDARDIZATION, METROLOGY AND CERTIFICATION
INTERSTATE
STANDARD
GOST 3722-2014
Rolling bearings
STEEL BALLS
Specifications
(ISO 3290-1:2008,NEQ)
Official publication
Standardinform
GOST 3722-2014
Preface
The goals, basic principles and basic procedure for carrying out work on interstate standardization are established by GOST 1.0-92 “Interstate standardization system. Basic provisions" and GOST 1.2-2009 "Interstate standardization system. Interstate standards, rules and recommendations for interstate standardization. Procedure for development, adoption, application, updating and cancellation"
Standard information
1 DEVELOPED by the Limited Liability Company "Engineering Center EPK" (LLC "IC EPK") based on its own authentic translation into Russian of the international standard specified in paragraph 5
2 INTRODUCED by the Technical Committee for Standardization TK307 “Rolling Bearings”
3 ADOPTED by the Interstate Council for Standardization, Metrology and Certification by correspondence (protocol dated August 29, 2014 No. 69-P)
4 By Order of the Federal Agency for Technical Regulation and Metrology dated September 8, 2014 No. 1008-st, the interstate standard GOST 3722-2014 was put into effect as a national standard of the Russian Federation on January 1, 2016.
5 This standard corresponds to the international standard ISO 3290-1:2008 Rolling bearings - Balls - Part 1: Steel balls.
Level of compliance - nonequivalent (NEQ)
Information about changes to this standard is published in the annual (as of January 1 of the current year) information index “National Standards”, and the text of changes and amendments is published in the monthly information index “National Standards”. In case of revision (replacement) or cancellation of this standard, the corresponding notice will be published in the monthly information index “National Standards”. Relevant information, notifications and texts are also posted in the public information system - on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet
© Standardinform, 2014
In the Russian Federation, this standard cannot be fully or partially reproduced, replicated and distributed as an official publication without permission from the Federal Agency for Technical Regulation and Metrology
1 area of use............................................... ........................................
3 Terms and definitions................................................... ...........................
4 Designations................................................... ...............................................
5 Dimensions................................................... ........................................................
6 Degrees of accuracy................................................... ........................................
7 Technical requirements........................................................ ............................
8 Sorting balls................................................... ...................................
9 Acceptance rules................................................................... ........................................
10 Control methods................................................................... ......................................
11 Symbol of balls.................................................... ...............
12 Labeling, packaging, transportation and storage.................................
13 Manufacturer's guarantees.................................................... .........
Appendix A (for reference) Explanation of the principles of sorting balls
INTERSTATE STANDARD
Rolling bearings
STEEL BALLS
Specifications
Rolling bearings. Steel balls Specifications._
Date of introduction - 2016 -01-01
1 area of use
This standard applies to steel balls (hereinafter referred to as balls) used in rolling bearings and in the form of individual parts.
This standard uses normative references to the following interstate standards:
GOST 9.014-78 Temporary anti-corrosion protection of products. General requirements
GOST 515-77 Bituminous and tar packaging paper. Specifications
GOST 16148-79 Wooden boxes for rolling bearings. Specifications
3.6 ball lot: A defined collection of balls of the same nominal diameter, degree of accuracy and material, manufactured under presumably the same conditions and presented for acceptance at the same time.
3.7 mean diameter of ball lot: The arithmetic mean of the average largest and smallest diameters of balls in a lot.
3.8 variation of ball lot diameter: The difference between the average diameters of the largest and smallest balls in a lot.
3.9 deviation of the average diameter of balls in a batch: Algebraic difference between the average diameter of balls in a batch and the nominal diameter of the ball.
3.10 ball grade: A specified combination of tolerances in size, shape, surface roughness, and ball grading accuracy.
Note - The designation of the degree of accuracy indicating the sign “G” should be used when designing new bearings, developing new ones, and when revising existing technical documentation.
3.11 ball gauge: The value of deviation from the nominal diameter of the ball, selected from an established discrete range of deviation values.
Notes
1 The maximum ball group is an integer multiple of the ball group interval established for the considered degree of ball accuracy.
2 The ball group, in combination with the degree of accuracy and nominal diameter, is considered to be the most accurate designation of ball size used by the consumer for ordering purposes.
3.12 interval of ball gauge: The difference between adjacent ball groups.
3.13 deviation of a ball lot from ball gauge: The difference between the average diameter of a lot of balls and the sum of the nominal diameter of the ball and the ball group.
3.14 ball subgauge: The value of deviation from the ball group, selected from an established discrete range of deviation values.
Notes
1 Each ball subgroup is an integer multiple of the ball subgroup interval established for the considered degree of ball accuracy.
2 Ball subgroup, in combination with nominal diameter and ball group, is used by the ball manufacturer to indicate the average diameter of a batch of balls, and is not generally used by the consumer for ordering purposes.
3.15 interval of ball subgauge: The difference between adjacent subgauges of a ball.
3.16 hardness: A measure of penetration resistance determined by a specific test method.
3.17 sample: A certain set of balls randomly selected from a batch of balls.
3.18 sample size: The number of balls in the sample.
3.19 banderole: Wide paper tape on product packaging.
4 Designations
The following symbols are used in this standard:
D w - nominal diameter of the ball;
Own - average ball diameter;
DwnL - average diameter of balls in a batch;
Single ball diameter;
G - degree of accuracy of the ball;
Is - ball group interval;
/ss - ball subgroup interval; n - sample size;
Ra - arithmetic mean deviation of the profile - according to GOST 2789;
Rz - height of profile irregularities at ten points - according to GOST 2789;
S- group of the ball;
VW is the difference in the diameter of the balls in the batch;
Vd*b - variability of the ball diameter;
Aown - deviation of the average diameter of the ball;
Astsh. - deviation of the average diameter of the balls in the batch;
AftSw - sphericity;
As is the deviation of the batch of balls from the group of balls. Note - Here As = CUl -(0* + S).
5 Dimensions
5.1 Nominal diameters of balls and approximate weight 1000 shg. balls are listed in Table 1.
Table 1
Continuation of Table 1
GOST3722-2014
End of table 1
| Weight 1000 pcs., kg |
Weight 1000 pcs., kg |
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1 Corresponding ball diameters in inches are for reference only. 1 inch = 25.4 units.
2 The mass of the balls is calculated for steel with a density of 7.85 kg/dm 1 .
5.2 At the request of a consumer goods enterprise, balls used in the form of separate parts may be manufactured with dimensions different from those indicated in Table 1, provided that the remaining requirements of the standard are met.
6 Degrees of accuracy
6.1 There are 11 degrees of ball accuracy, designated in order of decreasing accuracy as follows: G 3; G 5; G 10; G 16; G 20; G 24; G 28; G 40; G 60; G 100; G 200.
6.2 The variability in the diameter of the balls in the batch, the variability of the diameter of the ball, sphericity (without taking into account waviness) and surface roughness should not exceed the values specified in Table 2.
6.3 Deviations of the average diameter of balls used in the form of individual parts must correspond to the values specified in Table 2.
6.4 At the customer’s request, it is allowed to produce balls used in the form of separate parts with maximum deviations of the average ball diameter that differ from those indicated in Table 2.
table 2
Tolerances and maximum deviations in micrometers
| ultimate deviation |
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Valid for balls used as individual parts.
2 > For precision grades G 5-G 200, valid for balls with a diameter of no more than 3 gl.
6.5 Deviations of the average diameter of balls of all degrees of accuracy used in rolling bearings must correspond to the values specified in Table 3.
GOST 3722-2014
Table3
| Limit deviation |
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7 Technical requirements
7.1 Balls are manufactured in accordance with the requirements of this standard according to the technical documentation in force at the manufacturer and approved in the prescribed manner.
7.2 Balls must be heat treated to hardness:
from 748 to 868 HV.................for balls with a diameter from 0 J68 to 2 mm;
from 80.4 to 83.6 HR N30.............» »» from 2 to 2 5 mm;
from 82.3 to 84.5 HRA................» » » from 25 to 4.5 mm;
ot63ao67HRC...................................» » » St. 4 5 to 45 mm;
ot61ao67HRC...................................» » » St. 45 mm.
Hardness units HV according to GOST 2999, HRN30 according to GOST 22975, HRA and HRC according to GOST 9013.
Note - Hardness from 748 to 868 NU; 80.4 to 83.6 HRN30 and 82.3 to 84.5 HRA correspond to a hardness of 63 to 67 HRC.
7.3 The balls must be demagnetized in accordance with the documentation in force at the manufacturer and approved in the prescribed manner.
7.4 The balls must not have cracks, corrosion, traces of decarburization, as well as grinding burns in the form of secondary hardening and secondary tempering spots.
On the surfaces of the balls, nicks, cavities, dents and risks visible to the naked eye with a normal level of vision at a distance of (0 5 ± 0.1) m in diffused light and illumination (300 ± 50) lux are not allowed.
7.5 Balls with a diameter of 3 to 45 mm inclusive must withstand the compressive strength test.
7.6 Balls with a diameter greater than 45 mm must withstand the dimensional change test after compression.
7.7 The limits of waviness of the surface of the balls are established in accordance with the documentation in force at the manufacturer and approved in the prescribed manner.
8 Sorting balls
8.1 To assign balls to the appropriate groups and subgroups and to ensure the requirements for different diameter sizes, the balls should be sorted.
8.2 Sorting of balls should be carried out in accordance with the sorting boundaries and intervals of ball groups and subgroups given in Table 4. An explanation of the principles of sorting is given in Appendix A.
Table 4
In micrometers
| Preferred boundaries of ball groups |
Preferred boundaries of ball subgroups |
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GOST3722-2014
9 Acceptance rules
9.1 Balls are subjected to acceptance control for compliance with the requirements of this standard. Controlled parameters, control and testing methods during the production of balls are established by the manufacturer.
9.2 Balls for control are presented in batches. The batches are subject to random inspection. For each type of control, a certain sample size is established.
9.3 To control the steel grade, 0.03% of the balls from the batch are selected, but
Not less than 5 and not more than 10 pcs........... for balls with a diameter of up to 45 mm
Not less than 2 and not more than 5 shg...... ■" » » St. 45 mm.
9.4 To control hardness, three balls are selected from the batch.
9.5 To control the degree of accuracy, 0.1% of the balls from the batch are selected, but not less than 5 and not more than 50 pieces.
9.6 To control the condition of the surface, 0.03% of the balls from the batch are selected, but not less than 5 and not more than 50 pieces.
9.7 To control the compressive strength (for balls with a diameter from 3 to 45 mm inclusive) and to control the change in size after compression (for balls with a diameter of more than 45 mm), three balls are selected from the batch.
9.8 If the balls do not comply with at least one requirement of this standard, re-inspection of twice the number of balls taken from the same batch is carried out according to the same parameters.
The results of the re-inspection are final and apply to the entire batch.
10 Control methods
10.1 The control is carried out at the same temperature of the balls and mechanical parts of the measuring instruments (stands, tables, probes, stops).
10.2 The steel grade is determined in accordance with the documentation in force at the manufacturer and approved in the prescribed manner.
10.3 The method for controlling the hardness of the balls is selected depending on the nominal diameter of the ball.
10.3.1 The hardness of balls with a diameter of less than 0J68 mm is determined by the type of fracture for compliance with the standard. This method of determining hardness is acceptable for balls with a diameter of up to 5 mm. The arbitration method for hardness control for balls with a diameter of 2 mm or more is the method set out in 10.3.2 and 10.3.3.
10.3.2 Control of hardness of balls with diameter:
From 0.68 to 2 mm is measured by the Vickers method according to GOST 2999;
From 2 to 2.5 mm is measured on the HRN30 scale according to GOST 22975;
From 2.5 to 4.5 mm according to the HRNo scale GOST 9013;
More than 4.5 mm on the HRC scale according to GOST 9013.
The actual hardness of the balls is determined taking into account the distorting influence of the curvature of the controlled surface. The actual hardness for balls with a diameter from 2 to 2.5 mm is determined according to Table 5, for balls with a diameter from 2.5 to 4.5 mm - according to Table 6, for balls with a diameter over 4.5 to 30.162 mm - according to Table 7.
Table 5
Note - The actual hardness values in the table between the two thick broken lines satisfy the requirements of this standard.
Table 6
Hardness measured on the ball surface, HRA
| 79.5 | 80.0 | 80 5 j 81 JO i 81.5 j 82.0 Actual hardness, HRA |
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Note - The actual hardness values shown in the table between two thick broken lines satisfy the requirements of this standard.
