J122023 トポロジー最適化法によるプラスチック射出成形金型の冷却流路最適化

Abstract

Injection molding is the most popular method for producing plastic products because of its high productivity and manufacturability for making various complex shapes. An efficient cooling system, which achieves a uniform temperature distribution, can minimize the undesired defects that influence the quality of molded part. Traditionally, the cooling design is still mainly based on practical knowledge and designers' experience. This method is simple and efficient in practice, but it becomes less feasible when the molded part becomes much more complex. Topology optimization for heat diffusion problem is one of the expected solutions to overcome this problem. This paper is trying to establish a topology optimization method to design optimal layout of cooling channels by COMSOL Multiphysics. As a first step for this purpose, we have solved the heat diffusion problem by SIMP method. The objective is proposed to cooling channel design methodology based on the concept of total potential energy maximization in the structural design problem. From the results of numerical example for predefined internal heat generation, the distinct and complicate topologies of bisector tree structures have been found, which correspond to heat conditions and have effective cooling quality.