Die casting mold structure and material requirements


Die-casting molds can be used to make castings with com […]

Die-casting molds can be used to make castings with complex shapes, high precision and excellent surface quality. Among them, the most important process equipment in the quality assurance of die-casting parts and the common working environment are quite bad. What is the structure of the die-casting mold? What are the requirements for using materials?

The die-casting mold structure can be divided into five parts: the part that determines the geometry and dimensional accuracy of the die-casting part—the molded part; there is an overflow exhaust system on the molded part, mainly to exclude the gas in the pressure chamber runner and the cavity; The gating system is used to connect the pressure chamber to the mold cavity and serve as a conduit for guiding the metal liquid into the cavity. The mold part part is to combine and install the parts of the die-casting mold according to the law and position requirements. In addition to this, there are core pulling mechanisms and heating systems, cooling systems, other fastening bolts and positioning pins. The die-casting die is mainly divided into parts that are in contact with molten metal, sliding-fit parts, and formwork structural parts. Die-casting mold cavities and runners are directly in contact with high-temperature, high-pressure, high-speed metal liquids during metal pressure casting.

The overall structure of the die-casting mold can be viewed by the following figure. The die-casting mold consists of two parts: fixed mold and dynamic mold. The fixed mold is fixed on the fixed mold mounting plate of the die casting machine, and the pouring system is connected to the pressure chamber of the die casting machine. The movable mold is fixed on the movable mold mounting plate of the die casting machine, and is clamped and mold-opened with the fixed mold as the movable mold mounting plate moves, and the general core pulling mechanism and the pushing mechanism are disposed in the movable mold portion. When the mold is closed, the movable mold and the fixed mold close to form a cavity, and the molten metal is filled into the cavity at a high speed by the pouring system under the action of high pressure; when the mold is opened, the movable mold is separated from the fixed mold, and the pushing mechanism pushes the die casting from the cavity. The service life of the die-casting mold is closely related to the material of the die-casting mold. On the one hand, it is directly washed, worn, high temperature oxidized and corroded by molten metal. On the other hand, due to the high efficiency of production, the rise and fall of the mold temperature is very intense and a cyclical change is formed.