| Summary: | 碩士 === 國立臺北科技大學 === 製造科技研究所 === 105 === Warpage deformation of helmet visor may occur after injection molding. If the warpage deformation is too large, helmet visor will not be able to assemble with the cap body. This study is to explore the warpage deformation of helmet ventilation using Moldex3D R12 CAE software. Taguchi Method L8 (27) orthogonal array was used to carry out the noise experiment. Four significant noise factors obtained including the mold temperature, the melt temperature, the packing time, and the cooling time. Combined the four noise factors into a compound noise factor. Then, Taguchi Method L18 (21×37) orthogonal array was used to find the significant factors affecting S/N ratio and optimize the processing parameters. Significance tests of control factors with Analysis of variance (ANOVA) to compare the results of Taguchi Method. The confidence interval was also used to verify the prediction value of this experimental mode are accurate enough.
As a result, significant factors that affect warpage deformation are the melt temperature, the filling time, and the cooling time. Under the 90% confidence level, the significant factors are the same as the results analyzed by using Taguchi method. Warpage deformation improve from 0.888 mm to 0.602 mm with the optimized process parameters. The difference between the confirm experiment and the predicted value is within the confidence interval.
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