This dissertation is to provide some discussion and analysis about the reason of quality difference on the same die casting. It indicated: It is two areas in existence on the process of filling mold on the same die casting. namely

primary trunk die cavity and non-primary trunk die cavity. It is different from the two areas in filling quality. We can do the die casting design well

especially

in design of drawing running system

none but conforming with the law. It is the radical way to improve the die casting quality.