The purpose of this study is to propose a better contact surface pattern of a heat radiating block in a progressive GMP (Glass Molding Process) heating assembly. In this study, a simulation model based on FEM was developed to perform a thermal analysis for the heating assembly. It was verified by comparing experimental results. The temperature distribution on the heating block surface and heating energy consumption was analyzed with the change of contact surface pattern and area of a heat radiating block. The considered pattern on the contact surface was cross (+) and straight (-) shape. The contact area ratio was changed from 16 to 100%. The simulation results show that the heating energy consumption increased to reach a target temperature with the increase of contact area ratio. The straight-shaped patterns on a heat radiating block presented more uniform temperature distribution on the mold heating surface than the cross shaped surface, whereas it resulted in a slightly higher energy consumption of up to 9%. This study shows that the contact surface pattern on a heat dissipating block can control the temperature distribution on the mold heating surface.
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A Study on Temperature and Stress Distribution in a Lens under Multi-Stage Cooling Conditions in Progressive Glass Molding Processes Ji Hyun Hong, Jeong Taek Hong, Dong Yean Jung, Young Bok Kim, Keun Park, Chang Yong Park Journal of the Korean Society for Precision Engineering.2025; 42(2): 157. CrossRef
A Study on Numerical Analysis for Determination of Glass Molding Process Conditions for Glass Lenses Jaehun Choi, Sajan Tamang, Heesung Park Journal of the Korean Society for Precision Engineering.2024; 41(3): 207. CrossRef
Injection molding is one of most widely-used polymer processing technologies in which hot polymer fills a mold cavity, and is solidified during the subsequent cooling process. In the mold filling stage, the mold temperature should be high to improve flow characteristics, and low to reduce cooling time during the cooling stage. To fulfill these objectives, rapid mold heating technology has been developed to raise mold temperature, without significant increase in cycle time. While the conventional rapid heating technologies required dedicated facilities such as steam heating or high-frequency induction heating system and has a limitation in uniform heating, the purpose of this study was to develop a facile and conformal mold heating unit that uses a carbon nanotube (CNT) film heater. The CNT film heater was used to heat a curved mold with high temperature uniformity, by maintaining uniform distance from the mold surface. The developed conformal heating technology was then applied to a singly curved mold and a multiply curved mold. Considering that the resulting temperature uniformity is superior to the conventional oil heating, the conformal mold heating technology using the CNT film heater can be used to improve part quality and productivity in various molding processes.
The purpose of this study was to develop an efficient mold heating technology by an embedded heating unit. To localize the heating effect in the mold core and prevent heat transfer to surrounding mold plates, the core module with embedded heating unit was assembled to a mold plate in a detachable manner. The detachable core module was then separated from the mold plate when the mold was opened, and thus could be rapidly heated by the embedded heater. The heated core contacted with the mold plate when the mold was closed, and could be cooled by heat conduction to the mold plate of which thermal inertia was much larger than that of the core module. To verify thermal efficiency of the proposed structure, heat transfer simulation was performed with an experimental validation. Mold filling simulation was also performed to investigate the effect of mold heating on improving flow characteristics through a thin and narrow channel. Injection molding experiments were also conducted by adopting the proposed embedded heating module.
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Analysis of Rapid Heating Performance in Multi-Layered Injection Mold System for CNT Surface Heating Element Application Hyeon Min Lee, Young Bae Ko, Woo Chun Choi Journal of the Korean Society for Precision Engineering.2022; 39(7): 461. CrossRef
Energy Saving of Rubber Forming by Direct Heating Press Mold Development Young Tae Cho Journal of the Korean Society for Precision Engineering.2022; 39(7): 485. CrossRef
A Study on Conformal Heating of Curved Mold Using CNT Film Heater Seo-Hyeon Oh, Eun-Ji Jeon, Hyeon-Min Lee, Yeong-Bae Ko, Keun Park Journal of the Korean Society for Precision Engineering.2022; 39(7): 469. CrossRef
Conformal Mold Heating and Cooling Using a Carbon Nanotube Film Heater and Additively Manufactured Cellular Metamaterial Jeong-Hee You, Jun-Won Lee, Seo-Hyeon Oh, Keun Park International Journal of Precision Engineering and Manufacturing-Green Technology.2022; 9(6): 1463. CrossRef
A Study on the Heat Transfer Characteristics of a Glass Lens Mold Heating Block according to Design of a Heat Radiating Block Bo Min Seo, Dong Yean Jung, Keun Park, Chang Yong Park Journal of the Korean Society for Precision Engineering.2022; 39(7): 493. CrossRef
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