In addition to requiring sufficiently high strength and toughness in the work, the surface properties of high-precision mold accessories are crucial to the working performance and service life of high-precision mold accessories. The improvement of these properties is very limited and uneconomical if it is simply dependent on the improvement and improvement of the base material. However, through surface treatment technology, it can often achieve twice the result with half the effort, which is why surface treatment technology has developed rapidly. Mold polishing technology is an important part of mold surface engineering and an important post-processing process in the mold manufacturing process. Due to certain problems in domestic polishing process technology and materials, a large part of injection molds such as point-and-shoot camera lens injection molds, CD, VCD discs and injection molds with high tool transparency requirements still rely on imports.

It is worth noting that mold surface polishing is not only affected by polishing equipment and process technology, but also by the mirror surface of mold materials. This has not attracted enough attention. In other words, polishing itself is restricted by mold materials. Although new processing technologies aimed at improving the surface performance of precision mold accessories continue to emerge, nitriding, carburizing and hardened film deposition are mainly used in the manufacture of high-precision mold accessories. Since nitriding technology can form a surface with excellent performance, and the nitriding process has good coordination with the quenching process of high-precision mold parts steel, and the nitriding temperature is low, no intense cooling is required after nitriding, and the deformation of high-precision mold parts is extremely small, the surface strengthening of high-precision mold parts adopts nitriding technology earlier and is also the most widely used.