Abstract: Taking a square plastic part as an example, the core deformation of different mold structure was analyzed with considering the temperature and pressure fields by finite element method. It showed that the core deformation of a three-plate mold was smaller than that of a two-plate mold. The influence of mold width on the core deformation of two kinds of molds was large. The height of lower mold core had a great influence on the deformation of lower mold core, but the height of upper mold core had a small influence on the deformation of upper mold core. The structure and size of the mold core for this plastic part were optimized by consider the stiffness and cost.

Key words: finite element, mold structure, core deformation, optimization