1. Consideration of Cavity Layout1) Balance principle should be adopted as much as possible;2) The layout of the cavity and the opening of the gate should be symmetrical, in order to prevent the uneven load of the mold from generating unbalanced loads, resulting in bracing The problem of mold overflow;3) The cavity layout is as compact as possible to reduce the size of the mold.4) The arrangement of the cavity and the gate should reduce the external dimensions of the mold as much as possible.5) In the case of one mold with multiple cavities, the molten material entering each cavity should be reached at the same time, and the pressure at the entrance of each cavity should be equal, and at the same time, the filling should be synchronized as much as possible.