How to Solve the Problem of Zinc Alloy Defects
The key to controlling the generation of pores is to reduce the amount of gas mixed into the casting. The ideal metal flow should be continuously accelerated from the nozzle through the splitter cone and runner into the cavity to form a smooth and uniform flow of metal. This can be achieved with a tapered runner design. In the filling system, the mixed gas is formed by the turbulent flow and the metal liquid phase to form pores. From the study of the simulated die-casting process in which the molten metal enters the cavity from the casting system, it is apparent that the sharp transition position in the runner and the incremental runner cross-sectional area cause the turbulent flow of the molten metal. A smooth molten metal facilitates the flow of gas from the runners and cavities into the overflow and exhaust slots and out of the mold.