Study on the Shrinkage of Injection Molded Product

• Main Authors: Chiu, Yung-Fu, 邱永福
• Other Authors: Chen, Ren-Haw
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/99799685033610039620

碩士 === 國立交通大學 === 工學院碩士在職專班精密與自動化工程組 === 99 === This research focuses on the inwardly-bent deformation of plastic cases of USB flash drives after the injection molding. An attempt to find out an effective and fast solution was made to improve product qualities and to reduce the time and cost of product develop -ments, aiming at the appearance of the final product after component assembly. The factors of structural designs、CAE simulations、raw materials of plastic resin And molding parameters are discussed and then verified with actual tests of injection moldings. The finite-element-analysis software, MOLDEX 3D, was used for simulations of potential risks during molding process in the design stage, quick checks of part and mold designs, optimizations of molding parameters, and early predictions of defect zones to improve. As for the actual tests of injection moldings, an actual product was made via injection mold- ing process. 2.5D overhead projector, electrical height gauge, thickness detector, and X-ray equipmet are used to measure product dimensions before, during, and after the inward-bent deformations happened to verify the accuracy of simulation results.