| Summary: | 碩士 === 國立臺北科技大學 === 精密機構設計產業研發碩士專班 === 96 === Development of optic-electric industry makes the trend of design product thinner and smaller, and also with widely applications of plastic injection parts. Not only the manufacturer or designers have to consider the defects of plastic parts, but also the optical properties. This research is to investigate the residual stress of optical plastic parts caused by different injection molding parameter. First the moldflow is used and set different parameters to simulate the warpage, and then Taguchi method is used to find appropriate injection molding parameter for experiment. Residual stress has been calculated for regression analysis. From the result of regression analysis, the simulated data has 0.14% difference from experiment data of stress and the major parameters for residual stress are mold temperature and cooling time. The simulated data compared with experiment data of stress after annealing almost have no difference, the simulated data compared with experiment data of warpage has 3.6% difference and the major parameters for warpage are packing pressure and cooling time. Result of the stress before and after annealing has 1~3% difference. Result also shows that experiment data compared with regression model has little difference; therefore, the regression model can be used to predict residual stress from injection molding. Since the part of this experiment is a small thin plate with PMMA material, further research investigates residual stress of optical thin plate with larger dimension or micro features.
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