In injection mold, design of gate location is among the most critical factors in
achieving dimensionally accurate parts and high productivity of the molding process, since it
influences the manner in which the plastic flows into the mold cavity. To automatically predict the
optimal gate location of injection molds based on injection-molding simulation, a new and practical
method: empirical search method according to the analysis of common optimization methods has
been presented in this article. In this method, the gate location scope is initiated by the practical
experience of mold designer so that the core for the gate location optimization is construction of
empirical library. In order to build the empirical library, in terms of shape and function characteristic
of injection-molding part, all the parts are classified six kinds: shell, container, plate, structural part,
ornamental part and transparent part, and the corresponding design rules are kept in the empirical
library. In addition, this article combines the empirical search method and numerical simulation
technique, builds the mathematics model for the gate location optimization of plate part in empirical
library and obtains the gate location optimization scheme for this kind of part through one concrete
numerical example. The analysis and verification by adopting the software Moldflow testify the
optimization mathematics model is effective.
