Operating window of injection molding for plastic lenses constructed by response surface

• Main Authors: Bin-Hong Tang, 唐賓宏
• Other Authors: Kuo-Ming Tsai
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/51348118211670446673

碩士 === 國立勤益科技大學 === 機械工程系 === 101 === Injection molding of plastic products is a low-cost, high production-rate processing technology which is suitable for automation; however, the quality of the product is highly nonlinear because of the variations in temperature, pressure, flow-rate and density of the materials. This study is aimed at identifying the operation windows for the injection molding process parameters which produce lenses with optimized contour precision. The operation conditions for products with qualified contour precision and the lowest cost can be determined through these operation parameter windows. Taguchi experimental method was used to determine the optimized set of process parameters, and the control factors were identified through the contribution of the variance for each parameter. Full factorial experiments were implemented to identify the appropriate regression model to construct response surface, and the central composite design (CCD) was used to progressively determine the range of process parameters for lenses with minimum form error. The data points of the experiments were constructed the operation parameter windows, and confirmation experiments were performed to verify the validity of the windows.