What unreasonable places may appear in zinc alloy die castings?


Zinc alloy die casting is die casting. It is a die-casting mechanical die-casting machine equipped with a die-casting mold. Pour the heated zinc or zinc alloy into the inlet of the die casting machine. Zinc parts or zinc alloy parts whose shape and size are restricted by the mold are usually called zinc alloy die-cast parts. So, what unreasonable places may appear when using Shenzhen zinc alloy die-casting manufacturers?

For hot cracks: do not drastically change the thickness of die-casting parts to reduce stress; adjust related die-casting process parameters; reduce death

For water ripples and cold compartments: increase the mold temperature, increase the gate speed, or increase the overflow groove of the cold compartment to reduce the occurrence of cold compartments;

For intergranular corrosion: mainly to control the content of harmful impurities in the alloy raw materials, especially lead <0.003%. Pay attention to impurities brought by waste;

For shrinkage cavity: to ensure that all parts of the die casting and solidification process radiate heat and solidify at the same time. Reasonable nozzle design, gate thickness and location, mold design, mold temperature control and cooling can be used to avoid shrinkage.

Control the generation of pores: The key is to reduce the amount of gas mixed into the casting. The ideal metal flow should be continuously accelerated from the nozzle through the split cone and runner into the cavity to form a smooth and consistent metal flow. The shape of the runner design, that is, the pouring flow from the nozzle to the gate should be gradually reduced, which can achieve this purpose. In the filling system, the mixed gas is due to the turbulent flow and the liquid phase of the metal to form pores. From the simulation of the die-casting process, the molten metal enters the cavity from the casting system, and it is obvious that the sharp transition position and the amount of dumping in the runner increase. The cross-sectional area of ​​the runner will cause turbulence. The smooth metal liquid will help the gas enter the overflow groove and exhaust groove from the runner and cavity, and exit from the mold.