Investigation on the Establishment of Dynamic Variable-Gate Mold and its Application to Injection Molded Part Qualities

• Main Authors: Kuo-Jui Wang, 王國瑞
• Other Authors: Shia-Chung Chen
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/56mxm3

博士 === 中原大學 === 機械工程研究所 === 106 === The quality of injection molded product was affected by the pressure, temperature and the specific volume in each position during injection molding process, by applying the PvT monitoring technology, the data we get from pressure and temperature sensors can be analysis and transfer in to the PvT graph, which can control the quality of the molded product to achieved high quality mass production. In this research, PvT monitoring technology and the moveable gate design which can control the thickness of the gate during molding process was applied in order to investigate the shear rate and pressure drop in different gate thickness during molding, on the other hand, the influence of molding conditions to the molded quality was also investigated. The results show that, the more the thickness of the gate, the better the quality can be controlled by molding conditions, and also the better the compensate of the packing. On the moving gate thickness experiment results, using deferent delay time of gate moving can improve the quality of molded product, also the started time of gate return is the other key to control the quality, if the starts time was to late then the compensation of packing will be poor, if the started time was to early will also lower the compensation of packing since the gate was forces to be solidified. In the last part, the quality of molded product can be improved by applied the PvT monitoring technology to obtain the best packing pressure and packing time and was proved that the quality of product was related to the end of the PvT curve during molding process. When the thickness of the gate is reduced which will cause the pressure raised. And it has the effect of assist packing.