Journal of Mechanical Science and Technology

, Volume 33, Issue 11, pp 5375–5382 | Cite as

High-frequency induction heating for increase of flow length in polymer/metal hybrid molding

  • Hyun-Joong Lee
  • Nam-Hoon Jang
  • Keun ParkEmail author


Recent trends of miniaturization and multi-functionality in electrical parts have driven development of molded interconnect devices (MIDs) that contain conductive tracks on a nonconductive base. This study aims to develop polymer/metal hybrid molding technology to fabricate MIDs in a single manufacturing process, without an additional assembly procedure. For this purpose, injection molding was performed to fabricate a thermoplastic carrier that contained negative circuit channels, and die casting was used to fill the circuit channels with metal alloy of low melting point. To increase the flow length of the molten metal through the narrow circuit channel, high-frequency induction heating was used prior to the die casting stage. The effect of heating conditions on the mold temperature was investigated numerically, and the relevant induction heating conditions were determined accordingly. Induction heating was then applied to the die casting process to increase the flow length enough to be used as a circuit path for fabrication of MIDs.


Injection molding Die casting Multi-component molding Molded interconnect device Induction heating 



Radius of the point P(x, y)


Pitch distance between the adjacent spiral curve


Winding angle of the point P(x, y) in a spiral curve


Apparent angle of the point P(x, y) in a spiral curve


Magnetic permeability of the mold material


Electrical resistivity of the mold material


Thermal conductivity of the mold material


Density of the mold material


Specific heat of the mold material


Magnetic vector potential


Current density of the induced eddy current


Joule heat


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This study was supported by a grant from the Technology Innovation Program (Grant no: 10077472) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). The authors also thank to Mr. Dong-In Jang at HIGHT TECH SYS Co. Ltd. for his support with the die casting experiments.


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Copyright information

© KSME & Springer 2019

Authors and Affiliations

  1. 1.Department of Mechanical System Design EngineeringSeoul National University Science and TechnologySeoulKorea
  2. 2.Precision Engineering TeamSamsung Electro-Mechanics Co.SuwonKorea

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