论文信息 - Effects of Process Parameters and Two-Way Interactions on Sink Mark Depth of Injection Molded Parts by Using the Design of Experiment Method

Effects of Process Parameters and Two-Way Interactions on Sink Mark Depth of Injection Molded Parts by Using the Design of Experiment Method

Sink mark is one of the flaws occurring on the surface of injection-molded parts caused by inappropriate mold design and process parameters. Sink marks are often quite visible and significantly impair the surface quality of the parts. In this reports, an L27(313) experimental matrix designed based on the Taguchi method was conducted to investigate the effect of process parameters and two-way interactions on sink mark depth of injection molded parts, and to minimize the sink mark depth. The relative significance of each processing parameter on the sink marks was analyzed using analysis of variance (ANOVA) and F-test. A plate cavity with bosses of various thicknesses was used in the investigation. Experiments were carried out on a CJ80E II injection-molding machine, and sink mark depths were measured by a movable bridge 3D COMERO. For the factors and interactions selected in the main experiments, the boss thickness and melt temperature were found to be the principal factors affecting sink mark formation in injection-molded parts. Experimental investigation can help to understand the formation mechanism of sink marks, and to optimize the surface quality of injection-olded parts.

[1] Babur Ozcelik,et al. Comparison of the warpage optimization in the plastic injection molding using ANOVA, neural network model and genetic algorithm , 2006 .

[2] W. Tseng,et al. Influence of molding variables on defect formation and mechanical strength of injection-molded ceramics , 1998 .

[3] Ming-Chih Huang,et al. The effective factors in the warpage problem of an injection-molded part with a thin shell feature , 2001 .

[4] K. Valta,et al. The effect of processing parameters on the quality of injection moulded parts by using the Taguchi parameter design method , 1994 .

[5] Shih-Jung Liu,et al. Minimizing the sinkmarks in injection‐molded thermoplastics , 2001 .

[6] Jer-Haur Chang,et al. An experimental matrix design to optimize the weldline strength in injection molded parts , 2000 .

[7] Shih-Jung Liu,et al. Effects of processing parameters on formation of sinkmarks on injection moulded parts , 2001 .

[8] Keun Park,et al. Design of experiment considering two-way interactions and its application to injection molding processes with numerical analysis , 2004 .