The role of die casting molds and the selection of materials

Die-casting die is a method of casting liquid die forging, a process completed on a dedicated die-casting die forging machine. Its basic process is: the molten metal is first cast at low speed or high speed and filled into the cavity of the mold, the mold has a movable cavity surface, and it is pressurized and forged with the cooling process of the molten metal, which not only eliminates the shrinkage of the blank. Loose defects also make the internal structure of the blank reach the broken grains in the forged state. The comprehensive mechanical properties of the blank are significantly improved. Die-casting molds are mainly used for high temperature or high temperature operation, so that non-ferrous or ferrous liquid metal solidifies into qualified parts through high pressure in the mold cavity. Since the mold cavity works at high temperature, the characteristics of the die-casting mold are: the accuracy and quality of the cavity surface must be maintained under high temperature or higher temperature conditions during the service life of the mold. Therefore, in addition to the characteristics of plastic molds, the material of die-casting molds should also have high high temperature resistance, hardness, oxidation resistance, tempering stability and impact toughness, as well as good thermal conductivity and fatigue resistance. surname. Among them, the core and cavity materials of the mold are extremely important.

Die-casting parts have been widely used in all walks of life in the national economy, but you must know that if you want to make a high-quality die-casting part, you can't do without die-casting molds. Among them, the die-casting mold material is the main object in the design and manufacture of the bearing die-casting mold. It plays an important role in the die-casting mold industry, and plays a leading role in the difficulty of manufacturing the die-casting mold and the long service life of the die-casting mold. The die-casting mold material selected first should have good forgeability, machinability, wear resistance and corrosion resistance, and have high red hardness, high temperature strength, tempering resistance stability and impact toughness at high temperature. The second is that the material of the die casting mold should have good thermal conductivity, fatigue resistance, high temperature oxidation resistance, hardenability and small heat treatment deformation rate. Good die-casting mold materials are the basis for making good die-casting molds, and die-casting molds play a leading role in the production process of die-casting parts.

The core and cavity materials of die-casting molds are generally used in 3Cr2W8V in China, and there are also 4Cr5MoSiV1 (H13), 5CrNiMo and so on. Its common features are:

 1) At high temperature, it has high strength, hardness, stability against tempering and thermal shock toughness.

 2) It should have good thermal conductivity and thermal fatigue resistance.

 3) It is not easy to oxidize at high temperature, and can resist the adhesion and adhesion of liquid metal.

 4) The thermal expansion coefficient of the material is small.

 5) The heat treatment deformation of the material is small and the hardenability is good.

 6) Good forgeability and good machining performance.

 7) Can be welded when repaired or modified.