Study on Optimal Thermal Distribution for Hot Runner Manifold Heater

• Main Authors: Chen-Yang Lin, 林承洋
• Other Authors: Shia-Chung Chen
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/45791091578852976423

碩士 === 中原大學 === 機械工程研究所 === 97 === Abstract In this study, the optimal heater temperature distribution on manifold runner surface, the visualization and controllability of the heater have been learned. The CAE thermal simulation is also applied to establish the heater temperature visualization, seek the optimal temperature distribution and develop the heater adapter module. At first, the heater quality had been examined by international inspection specification standard MIL-STD-105E. Then we monitored the temperature distribution and the output power of the heater. The monitoring showed the temperature uniformity is nonlinear and the maximum temperature difference is about 100℃. Besides, the heater temperature will has variation in 10℃. After got the heater temperature information, the ANSYS and COMSOL are applied to visualize the heat flux of the heater and design the heater adapter module. It was found that the temperature uniformity of heater and the heater power are the key issues of saturation time of the manifold temperature. Also the manifold temperature warm up time was too long when using the traditional heater. The traditional heater needs about 370 seconds to reach stable and saturated temperature. The simulation shows that if the temperature distributed range can be reduced from 100℃ to 10℃ and the saturation time will be reduced about 60%. When apply the heater adapter to control the heat flow and thermal distribution, the simulation result showed that the heater temperature uniformity can be reduced to 15℃ and the experiment result showed that the heater temperature uniformity can be reduced to 20℃. The error between simulation and experiment is 2.2%. The results also showed that the higher heater adaptor conductivity coefficient and control the adapter output area and the tighter heater adaptor can result in good manifold runner temperature uniformity and good control ability of the heater. The future work will carry on the experiment and the CAE simulation of hot runner manifold heat transfer process to achieve the temperature distribution optimization and reduce the saturation time. Also the non-linear heating of heater adapter and the manifold structure geometric optimization design will be proceeded to control the heat flow and heat transfer. From this study, it will lead to a better understanding on the heater temperature control of hot runner system. The study results have been applied to patent and provide crescent competitive power in the industry.