How to deal with zinc alloy die-casting parts?
How to deal with the pitting of zinc alloy die-casting parts? The defect on the zinc alloy die-casting part is the fine pitted distribution area formed on the surface of the casting under the condition of under-pressure due to the mold temperature or the temperature of the alloy liquid being too low during the filling process.
Analysis of the Causes of the Pitting of Zinc Alloy Die Castings
1. The metal is dispersed into dense droplets during filling, and the high-speed impact wall;
2. The thickness of the ingate is too small;
3, the gate speed is too fast;
4. The mold temperature is low.
Corresponding measures to solve the pitting of zinc alloy die-casting parts:
1. When the hot stamping is started, the molten metal flow is found to be dispersed. Properly design the gating system to avoid splashing of molten metal, improve exhaust conditions, and avoid excessive flow of gas into the flow;
2. When the hot stamping is started, the molten metal flow is found to be sprayed. Adjust the thickness of the gate properly;
3. When the hot stamping is started, the molten metal flow is found to be sprayed. Properly reduce the speed of the ingate;
4. The surface of the casting is dark and accompanied by a cold partition. Increase the temperature of the mold to within the process requirements by turning on the mold heater or spraying a few more molds.
