The effect of process condition on the void of shrinkage of Plastic wheel

• Main Authors: Lee, Chia-Wei, 李佳韋
• Other Authors: Chen, Hui-Li
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/94794424258243018226

碩士 === 遠東科技大學 === 電腦應用工程研究所 === 101 === The development of the plastic has reached its peak of history; it has been the essential elements in the daily life. Lightweight, durable, high production efficiency, rich in raw materials and low prices all the advantages. Therefore, plastic components gradually replaced other materials such as metal or ceramic. However, plastic processing needs to overcome many of molding defects in injection molding, such as uneven product thickness, different shrinkage rate, sink marks, and voids. The purpose of this study is to investigate the void improvement and design optimization of plastic wheel for the doors and windows used in house construction. The void caused by factors of injection molding parameters of injection pressure, holding time, mold temperature, melt temperature and injection speed. The effect of process conditions setting on the void was discussed. Computer aided engineering software, ANSYS, is then used to simulate stresses to establish deformation model of the product under different void due to various load. The experimental results show that a packing pressure 90Mpa, packing time 6 sec, melt temperature 190℃, mold temperature 80℃, the injection rate 50 mm/s are the best which can reduce the void of plastic wheel, The improvement is further verified by both analysis and experiment results. ANSYS simulate show that small void can reduce deformation. The experiment results of deformation have a good agreement with the simulation.