Experimental Study of Induction Heating Technology for Large-sized Mold Surface

• Main Authors: Che-wei Lien, 連哲緯
• Other Authors: Ming-shyan Huang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/00334723830304864987

碩士 === 國立高雄第一科技大學 === 機械與自動化工程研究所 === 100 === The main purpose of this study is using electromagnetic induction heating technology in a large-sized mold surface heating for injection molding. To provide a high heating rate and uniform heating temperature of a 42-inch LCD TV frame mold, designing of an induction coil is investigated in this research, which was only feasible to heat a small-sized mold surface in the past studies. Initially, induction coils used to heat targets at fixing mode, moving mode, and wrapping mode are evaluated. After selecting a suitable heating approach, the COMSOL Multiphysics software is then used to study an optimal design of induction coil. Furthermore, experiments of heating a large-sized mold plate are conducted to verify the feasibility. In practical tests of injection molding 42-inch LCD TV frames, the designed induction coil handled by a lab-made robot can successfully heat target. The results can be concluded that: (1) induction coil at fixing mode performs the best. (2) The heating performance for heating the large-sized plate with a 66 KVA electrical power, has a high heating rate of 5.5°C/sec (temperature uniformity 96.3%). (3) The result of practical use in a 42-inch LCD TV frame mold, has a high heating rate of 4.5°C/sec (temperature uniformity: the best is 97.3%). These results prove that electromagnetic induction heating are feasible to be applied to heat large-sized mold surface.