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
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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/T7925.1-1995bzxZ.net -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 HB10/100/180 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 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.