1. Control of air holes: The key is to reduce the amount of mixed gas of the casting. The ideal metal flow should continue to accelerate the nozzle to enter the cavity through the diversion cone and lane, forming a smooth metal flow direction. That is, the flowing flow should be continuously accelerated to gradually decrease, which can achieve this goal. In the filling system, the mixed gas is formed by the mixing of turbulence and metal liquid phase. The pouring system enters the liquid metal in the simulation die casting process of the cavity. Obviously, the flow tract is greatly increased

The transformation of the pouring mouth can make the metal liquid flow turbulent and curl the gas. The liquid metal is smooth, which is conducive to the gas entering the overflow and exhaust tank from the pouring mouth and cavity.

2. Contraction: All parts of the casting and solidification process of zinc alloy pressure casting and solidification process are as far as possible while heat dissipation, while solidifying at the same time. Through reasonable nozzle design, mold design, thickness and location of the mouth, the temperature control and cooling of the mold to avoid shrinkage. For crystal corrosion phenomenon: The main impurities control the harmful alloy materials, especially the lead <0.003%. Pay attention to waste and impurities.

3, water, cold partial lines: can increase the temperature of the mold, increase the speed of the internal watering, or increase the overflow groove in the cold partition area to reduce the cold appearance and turn off the grain.

4. Heat cracks: The thickness of the casting of zinc alloy pressure does not change rapidly, reducing the generation of stress; the parameters and adjustment of the die casting process; reducing the mold temperature.