JB/T 7925.1-1995 Sliding bearings Single-layer bearing anti-friction alloy hardness test method

JB/T 7925.1-1995 Sliding bearing Single-layer bearing Anti-friction alloy hardness test method JB/T7925.1-1995 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Sliding bearings
Hardness testing method of bearing metals-Solid materials
This standard adopts ISO4384/2-1982 "Sliding bearings-Solid materials" with reference to ISO4384/2-1982.
1 Subject content
GB10452-89
JB/T7925.1-1995
-Hardness testing of bearing alloys-
-Part 2: Single-layer materials
This standard specifies the method for testing the hardness of single-layer material sliding bearing anti-friction alloys. 2 Reference standards
3 Test piece
Metal Brinell hardness test method
The test surface of the test piece should have a metallic luster and be able to conveniently measure the test indentation. During the preparation of the test piece, the influence of overheating on the surface hardness of the test piece should be avoided. For cast and forged copper alloy and aluminum alloy bearings, the surface layer of the test surface should be removed first, and then polished. When polishing the test surface of the test piece, for lead-based and tin-based alloys with a surface roughness value R, ≤ 6.3μm, use metallographic sandpaper with a particle size of 240; for copper-based and aluminum-based alloys with a surface roughness value R, ≤ 3.2um, use metallographic sandpaper with a particle size of 320. 4
Test conditions
4.1 The test conditions should comply with the provisions of the following table. Anti-friction alloy layer
Test piece conditions
Copper-based and aluminum-based alloy rods and tubes
Copper-based and tin-based alloy ingots
Copper-based and aluminum-based alloy castings
4.2 Example of test conditions
Test conditions
HB2.5/62.5/10 is preferred. If the inspected area is too small, HB1/10/10 can also be used. For casting alloys with more sand holes, use
HB5/250/10
HB10/100/180bzxz.net
HB10/1000/10
Ambient temperature
For example, HB5/250/10 means the Brinell hardness test with a steel ball diameter of 5mm, a test load of 2.45kN and a load action time of 10s.
Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on February 10, 1989 and implemented on January 1, 1990
HB can also be divided into:
HBS indicates that the indenter is a steel ball;
HBW indicates that the indenter is a cemented carbide ball.
Test method
GB10452-89
Brinell hardness test shall be carried out in accordance with the provisions of GB231. Additional remarks:
This standard was proposed by the Ministry of Machinery and Electronics Industry. This standard is under the jurisdiction of the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry and Changchun Automobile Research Institute. The main drafters of this standard are Wan Ma and Zhang Baoyi. 396
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