Quality Improvement of Plastic Injection Molded Product Using Doe and Taguchi Techniques

Abstract

This paper studies the effect of process parameters like melt temperature, mold temperature, packing pressure, sprue diameter and gate diameter on product quality responses like fill time of cavity and volumetric shrinkage of electrical switch board. In the first part an experimental methodology was developed using DOE (Design of experiment)technique. Taguchi method was used to design an orthogonal array of five factors having three levels. Second part is developing FEM simulation using MFA software provided by Autodesk Company. Main results are based on S/N ratio and ANOVA analysis. It is found that most critical parameter in this study is sprue diameter and less effective parameter is packing pressure. Model equations are also developed in this study.