Warpage Optimization of Molded Part with Plastics Injection Based on Taguchi Method

A set of moldflow analyses are carried out by combining the process parameters based on the L9 (34) Taguchi orthogonal design. These experiments are performed aiming at finding the influence on and the contribution to the warpage of the injection exerted by the process parameters such as the melting temperature, mold temperature, packing time, packing pressure and so on. The signal-to-noise and the analysis of variance (ANOVA) are used to find the optimal levels and to indicate the impact of the process parameters on warpage. An optimum condition for minimizing the warpage of the product has been found based on a number of tests using a mixed-level orthogonal array according to the order of importance of each parameter obtained in the first step of experiment. After the optimization, the warpage of the product is reduced by 31.98%, and the quality of the product is greatly improved.