With the continuous development of China's industrial level, China's mold industry has also developed rapidly, and many mold manufacturing companies' cover plate mold manufacturing capabilities have reached the international advanced level. However, the development of molds in the western region of China is still at a low level and requires the support of a large number of skilled workers. The manufacture of advanced plastic cover molds is inseparable from the advanced mold polishing process. The advanced plastic cover mold polishing process can improve the service life of the mold and improve the production efficiency of the mold.
The fatigue fracture performance of the plastic mold of the cover plate mainly depends on its strength, toughness, hardness, and the content of inclusions in the material. When the working temperature of the plastic cover mold is high, the hardness and strength will decrease, leading to early wear of the mold, or plastic deformation and failure. Therefore, the mold material should have high resistance to tempering to ensure that the plastic cover mold has higher hardness and strength at the working temperature. Some molds are in the state of repeated heating and cooling during the work process, which causes the surface of the cavity to be stretched and pressure to change the stress, causing surface cracking and peeling, increasing friction, hindering plastic deformation, and reducing dimensional accuracy, which results Mold failure. Cold and hot fatigue is one of the main forms of failure of hot work molds. Such molds should have high cold and hot fatigue resistance.