The Application and Research for Multi-component Injection Molding Parts

• Main Authors: Liao, Wen-Pin, 廖文彬
• Other Authors: Huang, Chin-Kwang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/91234273869138617532

碩士 === 龍華科技大學 === 機械工程系碩士班 === 103 === With the continuous developing of modern plastic craft, many new macromolecule materials have been developed and, compare with the characteristics of wood and metal, new materials’ are regarded to have higher utilizability. Therefore, many new techniques of specific injection molding are created correspondingly. The most representative new technique is Multi-Component Injection Molding. The purpose of this research is to manufacture ABS+TPR and ABS+TPU, the sealing component of linear guide, by the technique of Multi-Component Injection Molding. In the manufacturing process of TPU and TPR, burr usually happened due to over-pressure and, if the pressure is insufficient or the time of pressure-keeping is too short, contraction is generated due to the flexibility. Furthermore, the connectivity of ABS+TPR and ABS+TPU could be influenced by different temperature of cement or that of die. The higher temperature, the better connectivity. Compare to TPR, TPU has better connectivity so that there is no need to add cement between TPU and ABS, the backing material. For TPR, pseudo-connect usually happened between TPR and ABS. Founded in the research of dustproof depended on mechanical characteristics, drag force would decrease to a specific range when the operation length gets a certain distance. It’s called natural wear period. The effect of dustproof gets worse when this period ends. In the next period called saturation period, the wood dust gets inside the carriage continuously until the operation stops. Based on the research data, the effect of dustproof component stays in optimum condition during the natural wear period and gets worse dramatically when the speed of wear decreases slowly.