Application of Taguchi Method in Parametric Study of Injection Molding of Display Front Panel

We propose an analysis procedure to investigate the effects of design factors on the product quality of molded front panels via computational injection molding. Display front panels are commonly used ultra thin devices for security and decoration purposes. Poorly designed injection molds often produce texture and warping defects. Design of front panel injection molds is very challenging due to their esoteric shapes with numerous circular and rectangular holes for accommodating electronic circuits, and buttons as well as thin-walled panel. In order to make efficient design process, this paper uses Taguchi method as a computational method. MOLDFLOW simulations were obtained for various cases to process parameter combinations based on three-level of L27 Taguchi orthogonal design. The signal-to-noise（S/N） is used to find optimum levels and to indicate the impact of process parameters on deflection. As a result, packing pressure and cooling channel are found to be significant factors in this simulation for injection molding process of front panels. Tests were performed to evaluate the effectiveness of this study after desired levels of process parameters are determined. It is noted from this study that computer simulation cases based on Taguchi method are an efficient way to fix deflection problem for front panel molding.