Die Casting Supplier  introduces how to solve the pores and impurities of aluminum alloy die castings?

1. About stomata:
The key is to reduce the amount of gas mixed into the casting. The ideal metal flow should continue to accelerate from the nozzle through the split cone and runner into the cavity to form a smooth and consistent metal flow. The tapered runner design is adopted. That is, the pouring flow should be gradually reduced from the nozzle to the gate at an accelerated rate, which can achieve this goal. In the filling system, the mixed gas forms pores due to the mixing of turbulence and the liquid phase of the metal. From the study of the simulated die-casting process in which the molten metal enters the cavity from the casting system, it is obvious that the sharp transition position and the incremental casting in the runner The cross-sectional area of ​​the channel will cause the molten metal flow to appear turbulent and entrain gas, and the stable molten metal is conducive to the gas entering the overflow groove and exhaust groove from the runner and cavity, and is discharged out of the mold. Use brand-new ceramic filter material, do not use secondary nozzle material, reduce impurities.
　
2. About shrinkage:
It is necessary to make all parts of the die-casting solidification process uniformly dissipate heat at the same time and solidify at the same time. Reasonable nozzle design, inner gate thickness and position, mold design, mold temperature control and cooling can be used to avoid shrinkage. For the phenomenon of intergranular corrosion: mainly to control the content of harmful impurities in the alloy raw materials, especially lead<0.002%. Pay attention to the impurity elements brought by the waste.

Through the above introduction, Zinc Die CastingManufacturers hopes that you can simply refer to the content of this article in future use.