Study on Injection Molding of a Micro Part with Biconcave Structure

• Main Authors: Jyun-Yan Huang, 黃俊諺
• Other Authors: Min-Wen Wang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/8m5fw5

碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 103 === In order to pursue rapid productivity and cost-effective of micro-manufacturing technology, micro-injection molding is a new trend to the current market. However, during product manufacturing process, different kinds of products usually face problems with uneven thickness or some special structure design to result in uneven shrinkage of the product. According to the above-mentioned causes, this research focuses on exploring the tiny structures forming and select structure design of biconcave as a study object. The research aims to design and manufacture formable mold for experiment uses under limited resources; moreover, solve problems with mold forming from research process and investigate molding parameters for the influence of product shrink. This research used crystalline plastic material (polypropylene) for injection molding and successfully resolved a problem which was voids of the center of the biconcave structure. The optimal process parameters for injection molding obtained from the experiment which was plastic temperature 240℃、mold temperature 90℃、injection speed 30 mm/s and the smallest shrinkage 10.937%. In this study, melt temperature contributes the most which is 48.47% followed by injection speed 29.73% and mold temperature 10.55%.