Dimensional Stability and Roundness Error Optimization of Injection Molded Cu/Polyamide 6

Injection molding is one of the most extensively employed manufacturing methods to produce high quality part at high production rate. However, achieving high precision and quality product is still one of the biggest challenges in injection molding process. In this study, the optimal value of injection molding parameters is investigated. The initial injection parameters are determined using Moldflow software, then it is tested in experimental setup with feedstock composition of 90% Cu and 10% PA-6. After the experiments are done, the optimal combined response can be calculated Taguchi-grey-fuzzy method. Furthermore, ANOVA is done to measure how much contribution is given by each of parameters. From the analysis, it is given that 10 MPa and 9 MPa is the optimal value of both injection pressure and holding pressure respectively. It is also noted that the holding pressure had a higher contribution (39.62%) than injection pressure (13.13%) on the dimensional change and roundness.