A Study on Rapid Mold Heating System using High-Frequency Induction Heating

Jeong, Hui-Tack; Yun, Jae-Ho; Park, Keun; Kwon, Oh-Kyung

doi:10.3795/ksme-a.2007.31.5.594

Cited by 11 publications

(1 citation statement)

References 6 publications

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“…To satisfy these conflicting objectives, rapid mold heating and cooling technology has been used to raise mold temperature without a significant increase in the cycle time [2]. Various heating technologies were applied to the rapid mold heating, such as gas flame heating [3], infrared radiation heating [4], steam heating [5], high-frequency proximity heating [6], and high-frequency induction heating [7].…”

Section: Introductionmentioning

confidence: 99%

Conformal Mold Heating and Cooling Using a Carbon Nanotube Film Heater and Additively Manufactured Cellular Metamaterial

You

Lee

et al. 2021

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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In injection molding, the mold temperature needs to be controlled carefully not only to improve part quality but also to reduce cycle time. To fulfill these objectives, an energy-efficient mold heating and cooling technology is proposed to obtain conformal temperature control of mold surfaces. For conformal mold heating, a carbon nanotube (CNT) film heater was prepared and installed in a curved mold by maintaining a uniform distance from the mold surface, and its conformal heating capability was investigated numerically and experimentally. To improve the heating capability by preventing energy loss, an additively manufactured cellular metamaterial was placed beneath the CNT film heater, which played the role of a thermal insulator. For conformal and rapid mold cooling, this cellular metamaterial acts as a heat exchanger by circulating a coolant through the porous space of the cellular structure. The combinational use of the CNT film heater and cellular metamaterial ensures uniform temperature change on the mold surface during the thermal cycle by maintaining the temperature deviation within ± 6 °C during the heating stage and ± 0.3 °C during the cooling stage. Considering that this temperature uniformity is superior to the previous mold heating technologies, such as steam or induction heating, the proposed conformal mold heating and cooling technology can be used to improve part quality and productivity in various molding processes.

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Section: Introductionmentioning

confidence: 99%

Conformal Mold Heating and Cooling Using a Carbon Nanotube Film Heater and Additively Manufactured Cellular Metamaterial

You

Lee

et al. 2021

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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Three-dimensional numerical modeling of an induction heated injection molding tool with flow visualization

Guerrier

Tosello

Nielsen

et al. 2015

Int J Adv Manuf Technol

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Eliminating weldlines of an injection-molded part with the aid of high-frequency induction heating

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High-frequency induction is an efficient way to heat mold surface by non-contact electromagnetic induction. It has been recently applied to injection molding because of its capability to heat and cool mold surface rapidly. This study applies high-frequency induction heating to eliminate weldlines in an injection-molded plastic part. To eliminate or reduce weldlines, the mold temperature at the corresponding weld locations should be maintained higher than the glass transition temperature of the resin material. Through 3 s of induction heating, the maximum temperature of 143 °C is obtained on the mold surface around the elliptic coil, while the temperature of the mold plate is lower than 60 °C. An injection molding experiment is then performed with the aid of induction heating, and the effect of induction heating conditions on the surface appearance of the weldline is investigated. The weldline on the heated region is almost eliminated, from which we can obtain the good surface appearance of the part.

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A Study on Rapid Mold Heating System using High-Frequency Induction Heating

Cited by 11 publications

References 6 publications

Conformal Mold Heating and Cooling Using a Carbon Nanotube Film Heater and Additively Manufactured Cellular Metamaterial

Conformal Mold Heating and Cooling Using a Carbon Nanotube Film Heater and Additively Manufactured Cellular Metamaterial

Three-dimensional numerical modeling of an induction heated injection molding tool with flow visualization

Eliminating weldlines of an injection-molded part with the aid of high-frequency induction heating

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