The new technology for the surface treatment of die casting dies is constantly emerging, but it can be divided into the following three major categories:
(1) the improved technology of traditional heat treatment process;
(2) surface modification technology, including surface heat diffusion, surface phase transformation strengthening, EDM technology and so on.
(3) coating technology, including chemical plating etc..
Die casting die is a big class in the mold. With the rapid development of China's automobile and motorcycle industry, the die casting industry has entered a new era of development. At the same time, higher requirements for the comprehensive mechanical properties and life span of die casting die are put forward. International Mould Association Secretary General Luo Baihui believes that the application should meet performance requirements continuously improve to rely solely on the new mold material is still difficult to meet, must be all kinds of surface treatment technology is applied to the surface treatment of casting molds for die-casting die to achieve high efficiency and high precision and high life requirements. In all kinds of moulds, the working conditions of die casting die are more stringent. Pressure casting is the molten metal under high pressure and high speed full mold and die-casting molding, in the process of repeated contact with hot metal, so the casting mold has higher heat resistance, thermal fatigue wear resistance, corrosion resistance, impact toughness, red hardness, good releasability etc.. Therefore, the requirements for the surface treatment technology of die casting die are higher.