Precision plastic molds mainly include a concave mold combination substrate, a concave mold component, and a concave mold combination.

A concave die with a variable cavity composed of a card board, which is a convex die with a variable core composed of a convex die combination substrate, a convex die component, a convex die combination card board, a cavity cutting component, and a side cutting combination board. Coordinate changes in mold convex, concave, and auxiliary forming systems. Can process series of plastic parts of different shapes and sizes.