Due to the long production cycle, large investment, high manufacturing precision and high cost, the die-casting mold has harsh working conditions. When the die-casting is produced, the surface of the die-casting cavity is not only subjected to the high pressure and high-speed erosion of the molten metal, but also in the intense heat. Exchange, metal flow is complicated, and many factors affect the quality of die castings and die life. Therefore, designing and manufacturing a pair of die-casting molds that can ensure the quality of die-casting parts and durability can become the goal pursued by mold design and manufacturing enterprises.
According to the characteristics of the die casting production process, as well as the production practice summary. Factors such as mold design, part machining, part heat treatment, mold assembly, mold use, etc. are the main factors affecting the quality of die castings and the service life of the mold.
1. Ensure the quality of die castings is stable
When designing the mold, the main purpose of the die casting and the assembly relationship with other structural parts should be fully understood, so as to distinguish the primary and secondary, highlight the key points of the mold structure, and obtain the die castings that meet the technical requirements and requirements. The mold design should fully reflect the superior performance of die-casting, and die-casting the structure conforming to the die-casting process, such as holes, grooves, undercuts, side protrusions, etc., to avoid unnecessary post-processing.
When necessary, discuss the rationality of die casting design with the design of die casting: if consistent wall thickness is used; draft angle; sidewalls, ribs, raised parts, etc., with large rounded corners; sharp outer corners Apply rounding or chamfering to eliminate the possibility of mold failure and reduce maintenance; barbs should be avoided as much as possible, as they require machining of the part or the use of a reciprocating core slide in the mold; Let the main dimensions be related to the die-casting part, not the parting line. Since the parts are asymmetrical in the two parts of the ejector die and the fixed die, it is very difficult to achieve the same accuracy on both sides of the die-casting die boundary.
Therefore, the mold designer should give full play to the technical functions and production capacity of the die casting machine according to the technical characteristics of the die casting machine. Mold installation should be convenient and reliable.