New method of designing runner system for injection mold using CAO technique

Today it is popular to evaluate injection molding process using computational analysis in advance. Designing runner system is important to control flow balance and weld positions for molds of large parts with multi gates.If designers use conventional injection molding analysis, they need to evaluate many runner systems by trial and error for obtaining solution, which is optimum only within the tried runner systems. In this paper, we propose an automatic method of designing runner system using Computer Aided Optimization (CAO) technique in order to control weld positions, and show an example of this method with Variable Complexity Model (VCM) approach to reduce optimization time maintaining accuracy of analysis.