Induction heating with the ring effect for injection molding plates |
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Authors: | Hsuan-Liang Lin Shia-Chung Chen Ming-Chang Jeng Pham Son Minh Jen-An Chang Jiun-Ren Hwang |
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Affiliation: | 1. Department of Mechanical Engineering, National Central University, Taiwan, ROC;2. Department of Mechanical Engineering, Chung Yuan Christian University, Chung-Li 32023, Taiwan, ROC;3. R&D Center for Membrane Technology, Chung Yuan Christian University, Chung-Li 32023, Taiwan, ROC;4. R&D Center for Mold and Molding Technology, Chung Yuan Christian University, Chung-Li 32023, Taiwan, ROC |
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Abstract: | Induction heating in injection molding has the advantages of rapid heating, reduced cycle time, and improved product quality. In this research, using both experiment and simulation, externally wrapped coil induction heating was applied to verify the heating capacity of a pair of mold plates. By applying different coil designs and mold gap, the effect of the externally wrapped coil induction heating was evaluated. Results showed that when a serial coil was used as an inductor, the heating rate reached 8.0 °C/s. From an initial mold temperature of 40 °C, after 15 s heating, the mold surface temperature reached 159.9 °C with the serial coil. The parallel coil shows a better heating uniformity but its heating rate is far lower than the serial coil. For the serial coil, the temperature distribution between the core and cavity plate are almost the same. The heating rate increases from 4.9 °C/s to 10.6 °C/s when the inductor design is changed from 5 turns to 7 turns. After 15 s heating, the temperature at point T2 increases from 40 °C to 166.7 °C and 106.1 °C with a mold gap of 1 mm, and 6 mm, respectively. |
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Keywords: | Dynamic mold temperature control Induction heating Inductor design |
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