From the application point of view, steel balls can be divided into wear-resistant steel balls for crushing industry and bearing steel balls for precision bearing industry. The quality of the bearing steel ball directly affects the service life of the bearing. With the development of the steel ball industry, there are more and more enterprises producing steel balls. How to judge the quality of a bearing steel ball?
First of all, look at the appearance of the bearing steel ball under the astigmatism lamp. The bearing steel ball is a high-precision product, and the corresponding surface finish is also very good, so the surface of the high-quality steel ball is usually brighter, and there is no scratch or bruise. Surface defects such as burns and rust spots.
Secondly, the grade of the steel ball has strict requirements for spherical error, spherical diameter variation, surface roughness, crushing load, metallographic structure and the like. Therefore, it is necessary to use professional instruments to test these items according to the corresponding standards GB/T308.1, ISO3290, etc. According to the results of all the test items, the grade of the steel ball can be determined, and the quality of the bearing steel ball is known.www.wxjnsteelball.com