JB/T 7361-2007 English PDF (JBT7361-2007)

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JB/T 7361-2007: Rolling bearings. Test method for hardness of parts
JB/T 7361-2007
JB
MECHANICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
J 11
Registration number. 20315-2007
Replacing JB/T 7361-1994
Rolling bearings - Test method for hardness of parts
ISSUED ON. MARCH 06, 2007
IMPLEMENTED ON. SEPTEMBER 01, 2007
Issued by. Ministry of National Development and Reform Commission of
People’s Republic of China
Table of contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Symbols... 5 
4 Basic requirements of hardness test ... 6 
5 Samples ... 6 
6 Test methods ... 7 
Appendix A (Normative) Dimension of steel ball hardness test bench ... 10 
Appendix B (Normative) Dimension of cylindrical roller hardness test bench 11 
Appendix C (Informative) Test report on bearing parts hardness test ... 13 
Foreword
This standard replaces JB/T 7361-1994 “Rolling bearings - Test method for
hardness of parts”.
As compared with JB/T 7361-1994, the main changes of this standard are as
follows.
- IMPROVE the requirements for the test surface of the bearing parts (1994
version; 5.3 of this version);
- ADD the hardness test method types for the large-size bearing parts (SEE
Table 2);
- MODIFY the expression form of the hardness test point position (6.2.5 of
1994 version; Table 4 of this version);
- MODIFY the distance from any indentation of the Rockwell and Vickers'
methods to the sample edge AND the distance between the centers of two
adjacent indentations (6.2.5.1 and 6.2.5.2 of 1994 version; Table 4 of this
version);
- MODIFY the expression form of the number of hardness test points (6.2.6
of 1994 version; Table 5 of this version);
- MODIFY the interval of the ferrule test points (6.2.6.1 of 1994 version;
Table 5 of this version);
- MODIFY the expression form of the test report (Chapter 7 of the 1994
version; Appendix C of this version);
- DELETE the Appendix “Conversion between Leeb hardness and Rockwell
hardness” (Appendix A of 1994 version).
Appendix A and Appendix B of this standard are normative appendixes, AND
Appendix C is an informative appendix.
This standard was proposed by the China Machinery Industry Federation.
This standard shall be under the jurisdiction of the National Rolling Bearing
Standardization Technical Committee (SAC/TC 98).
The main drafting organizations of this standard. Wanxiang Qianchao Co., Ltd.
The participating drafting organizations of this standard. Luoyang Bearing
Research Institute.
The main drafters of this standard. Zheng Xiaomin, Lei Jianzhong, Qiu Yajun,
Fan Weiguang, Xuan Hengyan.
Rolling bearings - Test method for hardness of parts
1 Scope
This standard specifies the hardness test method for the steel and non-ferrous
metal bearing parts.
This standard is applicable to the hardness test of the steel bearing parts after
quenching and tempering, the finished bearing parts, and the non-ferrous
metal bearing parts.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 230.1-2004 Metallic Rockwell hardness test - Part 1. Test method
(scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-1.1999, MOD)
GB/T 1184-1996 Geometrical tolerancing - Geometrical tolerance for
features without individual tolerance indications (eqv ISO 2768-2.1989)
GB/T 4340.1-1999 Metallic materials - Vickers hardness test - Part 1. Test
methods (eqv ISO 6507-1.1997)
GB/T 17394-1998 Metallic materials - Leeb hardness test
JB/T 1255-2001 Specification for heat-treatment of rolling bearing parts
made from high carbon chromium steel
3 Symbols
The following symbols apply to this standard.
be. The effective width of the ferrule end face (the ferrule wall thickness
minus the internal and external chamfer size);
D. Nominal outer diameter of the ferrule;
Dw. Nominal diameter of rolling body;
HRA. A scale Rockwell hardness;
HRC. C scale Rockwell hardness;
HLD. Leeb hardness as measured by D-type impact device;
HV. Vickers hardness;
Ra. Surface roughness.
4 Basic requirements of hardness test
4.1 Laboratory
Hardness laboratory shall be dry, clean, AND free from strong vibration or
corrosive gas sources around. The indoor temperature is generally 10°C ~
35°C; as for the test having higher accuracy requirements, the room
temperature shall be controlled at 23°C ± 5°C, AND it shall be equipped with
workstations, standard parts cabinets and dust cover and so on.
4.2 Test equipment
All kinds of hardness testers and standard parts which are used for hardness
test shall be regularly verified.
5 Samples
5.1 Bearing parts shall be demagnetized before being subjected to hardness
test.
5.2 The surface roughness Ra of the hardness test surface and the positioning
surface of the bearing parts shall be as specified in Table 1.
Table 1
Test methods Rockwell method Vickers method Leeb method
Ra (max)
μm 0.8 0.32 2.0
5.3 The hardness test surface of the bearing parts shall be flat and smooth,
AND be free from such defects as oil stains, especially the burns,
decarburization, and cracks and so on.
5.4 The positioning surface of the bearing parts for hardness test shall be free
from such defects as oxide scale, coarse scratches, burrs, bump damages and
so on.
5.5 When measuring the Rockwell hardness and Vickers hardness of the
bearing ferrule, spherical roller, and convex roller, the parallelism of the two
end faces shall comply with the requirements of level 8 tolerance in Table B3 of
GB/T 1184-1996.