Bearing steel ball, if its surface has been polished, then this kind of steel ball is called polished bearing steel ball. Polished bearing steel balls are available in sizes of 4mm, 6mm, 7mm, 8mm, 10mm and 12mm. Therefore, the user can select the proper size according to the actual situation and the use demand, and then obtain a good use effect on the use of steel balls.
The purpose of the lapping and polishing process is to increase the surface brightness of the steel ball so that it can have a mirror effect. Polishing of bearing steel ball can use mirror polishing machine. Moreover, in addition to surface polishing, this type of polishing machine also performs some other surface treatments such as rust removal, oxide scale removal, and bright polishing. In addition, it can also be used for surface finishing before plating and before chemical treatment.
The hardness of the polished bearing steel ball is mainly related to the diameter of the steel ball. Therefore, different ball diameters have different ball hardness. When the ball diameter is not more than 45mm, the hardness range is 62-66HRC; when the steel ball diameter is greater than 45mm, the hardness range is 60-66HRC.