What is the pressure resistance performance of aluminum alloy die-casting molds?

Most of the defects on aluminum alloy die-casting molds do not occur when grooves are opened in the castings or when the enterprise analyzes mechanical processing. The reason is that the fine grain layer structure on the surface of the casting is removed, exposing the coarse grain area that extends towards the center, and all shrinkage problems are located below this skin layer. Once the outer surface of the casting is defective, it occurs under casting leakage pressure. If the surface of a casting is unprocessed, the internal holes have no direct impact on its pressure resistance.

Pressure and temperature have a significant effect on pressure resistance. Lower temperature pressure results in higher pressure resistance due to the dense surface layer on the cast surface and at low temperatures. The inner rounded corners located at the intersection of two or more angles in China are the areas where information leakage often occurs during casting, as these areas are generally hot nodes in the mold, forming a thinner surface layer. Increasing the corner radius will exacerbate this phenomenon, as the mold temperature is higher and the casting surface is thinner.

Pressure casting alloys also have an impact on the type of leakage that aluminum castings typically experience compared to zinc castings. There is little research on the leakage inside the casting or the information leakage between two main machining surfaces (the dense surface of the casting has been removed), and it is likely that the type of hole (connected or disconnected) rather than the number of holes determines whether the enterprise can produce this type of system leakage. It is very difficult to determine who will have the ability to produce a large amount of pressure casting in the total number of cases, and immersion technology is essential.