Optimizing injection molding towards multiple quality and cost issues

摘要

Injection molding part designers are frequently faced with multiple quality and cost issues. These issues are usually inconflict with each other, and thus tradeoff needs to be made to reach a final compromised solution. Since evaluation of part quality and cost via injection molding simulation is very time-consuming, implementation of a conventional multi-criteria optimization procedure to injection molding problems is econoically unfavorable. However, many injection molding problems dealing with multiple quality and cost issues can be modeled as constrained problems. by introducing a concept of Penalized total Cost, such constrained problems are further simplified into bounded single-criterion problems. The bounded single-criterion problems are then optimized using a direct search-based optimization procedure. Strategies of modeling, transformation and optimization for these problems are discussed in this paper. A case study is provided.