Method for detecting hardness of tubular parts
A detection method and technology of small parts, applied in the direction of testing the hardness of materials, etc., can solve the problems of not being able to truly reflect the hardness value of the part, and the unqualified part detection
Inactive Publication Date: 2016-08-03
HARBIN
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Problems solved by technology
Some small tubular thin-walled parts made of soft materials such as small bushings can only test the hardness on the curved surface due to the shape of the acceptance value of the hardness scale specified in the corresponding standard, because the tested surface does not conform to GB / T231 Standard Brinell hardness conditions, its value cannot truly reflect the hardness value of the part, therefore, almost every batch of parts is tested as unqualified
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[0014] Small tubular thin-walled small parts made of soft materials such as small bushings, if the parts fail to pass the test, they will be determined by the tensile test, and each batch of parts should be equipped with a hardness sample with a length of 10mm. During the uniform inspection, the hardness is tested on the transverse plane of the sample while the hardness is tested on the longitudinal curved surface of the parts and samples. The compliance of the state of the part can be judged by the acceptance value of the transverse plane hardness of the sample.
[0015] For example, the material is a 0C18Ni9 solid solution cylindrical pad, and a 10mm long hardness sample of the same batch is equipped. The average hardness value measured on the longitudinal surface of the part is 244.7HB; the value measured on the curved surface of the sample is 248HB, and the hardness value dispersion between the part and the sample is 3.7HB, less than 10% (the dispersion requirement is ≤10 ...
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Abstract
The invention provides a method for detecting hardness of tubular parts. The method comprises the following steps: adding a sample with a length of 10 mm for each batch of the tubular parts; performing 100% hardness detection on the curved surfaces of all tubular thin wall pasts, respectively detecting hardness of a transverse plane and a vertical curved surface of the sample, wherein, 2-3 points are measured on the transverse plane, taking a mean value which is the transverse plane hardness acceptance value of the sample; performing acceptance whether the part and the sample belong to a same batch through the hardness value of the part and the hardness value dispersion degree of the vertical curved surface of the sample; and performing acceptance whether the hardness of the part accords with standard requirements or not according to the hardness acceptance value of the transverse plane of the sample.
Description
technical field [0001] The invention relates to a method for detecting hardness of materials. Background technique [0002] In order to ensure the pattern compliance of the parts, after the steel parts for installation are processed, 100% state compliance testing is carried out on the parts by hardness testing. Some small tubular thin-walled parts made of soft materials such as small bushings can only test the hardness on the curved surface due to the shape of the acceptance value of the hardness scale specified in the corresponding standard, because the tested surface does not conform to GB / T231 Standard Brinell hardness conditions, its value cannot truly reflect the hardness value of the part, therefore, almost every batch of parts is tested as unqualified. In this case, the existing method is to take the same batch of raw materials for tensile test, and use it after passing the test. Contents of the invention [0003] The technical problem to be solved in the present ...
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IPC IPC(8): G01N3/40
Inventor 金春玉王淑艳王薇李游赵智泉
Owner HARBIN