Ma'anshan Shenma Machinery Manufacturing Co., Ltd. uses grinding equipment with independent intellectual property rights. During processing, only fine grinding chips are cut and there is appropriate friction polishing effect. The surface roughness reaches Ra0.08-0.04 microns. This is the ultra precision grinding stage, which undergoes fine finishing and mirror grinding under appropriate grinding pressure. After a certain period of friction polishing effect, the final mirror surface roughness Ra is not greater than 0.01 microns.

　　This technology has been successfully applied to the mirror roller and Magang production line of Japanese companies.