• Title, Summary, Keyword: Induction heating

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Improvement of Heating Pattern in RF Hyperthermia -Simultaneous Application of Dielectric Heating and Induction Heating-

  • Sakakibara, Norifumi;Ochiai, Makoto;Hayakawa, Yoshinori
    • Proceedings of the Korean Society of Medical Physics Conference
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    • pp.478-480
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    • 2002
  • Heating by RF wave is divided into dielectric heating and induction heating. Dielectric heating and induction heating from outside the body have the compensatory heating pattern. While surface fat layer is heated by dielectric heating, it is not heated by induction heating. While the peripheral part at the middle of the electrodes is not heated by dielectric heating, it is heated by induction heating. By the simultaneous application both modalities, heating pattern seems to be more uniform and improved. Computer simulation of Finite Element Method (FEM) using ANSYS was conducted to dielectric heating with the results of above-mentioned feature. Theoretical considerations by the uniform RF magnetic field in a cylinder and textbooks support the feature of the above-mentioned heating pattern of induction heating. Further computer simulation of FEM using ANSYS will be conducted to simultaneous application of dielectric heating and induction heating to verify and will be reported.

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Localized Induction-Heating Method by the Use of Selective Mold Material (재료의 선택적 사용에 의한 금형의 국부적 유도가열기법)

  • Park, Keun;Do, Bum-Suk;Park, Jung-Min;Lee, Sang-Ik
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.168-171
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    • 2009
  • High-frequency induction is an efficient way to heat mold surface by electromagnetic induction in a non-contact procedure. Though the induction heating has an advantage in terms of its rapid-heating capacity on the mold surface, it still has a restriction on mold temperature control due to geometric restriction of an induction coil according to the mold shape. It has been recently applied to the injection molding of thin-walled parts or micro/nano structures. For localized induction heating, an injection mold composed of ferromagnetic material and paramagnetic material is used. The electromagnetic induction concentrates on the ferromagnetic material, from which we can selectively heat for the local mold elements. The present study proposed a localized induction heating method by means of selective use of mold material. The feasibility of the proposed heating method is investigated through the comparison of experimental observations according to the mold material.

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A Study on Characteristic of High Frequency Induction Heating for Local Heating (국부가열용 고주파 유도가열 특성에 관한 연구)

  • Jin, Hyung-Kook;Lee, Dong-Ju;Shin, Sang-Beom
    • Proceedings of the KWS Conference
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    • pp.60-60
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    • 2010
  • Since the curved hull plate was made by a series of manufacturing process including cold bending, manual local heating and correction work, the accuracy of curved plate strongly depends on the proficiency of worker. So the demands on the automatic local heating system for curved hull plate have continuously increased and the various researches relevant to it have been performed. Generally, the heat sources used for local heating were flame and induction heat. In terms of initial cost, flame heating is in a better favorable position than induction heating. However, from the viewpoint of the control of heat, induction heating has more advantage. So the various researches related to apply the induction heating to the automatic forming system has been performed. The purpose of this study is to establish the proper capacity of high frequency induction heating system for forming the curved hull plate. In order to do it, the proper coil shape for local heating was designed and the efficiency of induction heating system was determined by comparing of temperature results obtained by FEA and experiment. With the results, the extensive FEA was performed to identify the effect of heated plate dimension, cooling method and the capacity of induction heating system on the amount of heat loss introduced by induction heating. Based on the results, the proper capacity of high frequency induction heating system was proposed.

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Simulation of Line Heating by High frequency Induction Heating (고주파 유도 가열에 의한 선상가열 시뮬레이션)

  • 김호경;장창두
    • Journal of Ocean Engineering and Technology
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    • v.17 no.1
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    • pp.80-85
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    • 2003
  • In this study, we developed an analysis method of plate forming by induction heating, verifying the effectiveness of the present method through a series of experiments. The phenomena of the induction heating involves a 3D transient problem, coupled with electromagnetic, heat transfer, and elastoplastic large deformation analyses. To solve the problem, or present an appropriate model and an integrated system. Using the present analysis model, or can estimate the plate deformation in heating without experiments and simulate the plate bending process of induction heating.

A Process for the Control of Cell Size of 6061 Al foams by Multi-step Induction Heating Method (다출력 유도가열 공정을 이용한 다공질 6061 알루미늄 합금의 기공 제어 공정)

  • 윤성원;강충길
    • Transactions of Materials Processing
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    • v.12 no.5
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    • pp.449-456
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    • 2003
  • Multi-step induction heating process was applied to the powder compact melting technique as a new heating process to achieve pinpoint accuracy, faster cycle time, repeatability, non-contact and energy-efficient heat in a minimal amount of time. The objective of this study is the establishment of the input data diagram of multi step induction heating process for automation of the fabrication process of 6061 Al foams with desired density. At first, proper induction coil was designed to obtain a uniform temperature distribution over the entire cross sectional area of specimen. By using this coil, foaming experiments were performed to investigate the multi-step induction heating conditions such as capacity, temperature and time conditions of each heating and holding step. On the basis of the obtained multi-step induction heating conditions, relationship between final heating temperature and fraction of porosity was investigated.

Design of Induction Heating Coil for Automatic Hull Forming System

  • Ryu, Hyun-su
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.24 no.3
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    • pp.360-366
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    • 2018
  • In shipyards hull forming is performed by the line heating method using a gas torch and by cold treatment using a roll-press. However, this forming process has some issues, such as difficulties in controlling and accurately estimating the amount of the heat input, as well as a harsh working environment due to exposure to loud noises and air pollution. The induction heating method, which is introduced in this paper, exhibits good control and allows for the estimation of precise heat input. Also, workers can carry out the induction heating in a comfortable working environment. In this research, the induction heating simulation, which consists of electro-magnetic, heat transfer and thermal elasto-plastic analysis, was developed and modified through induction heating experiments. Finally, the effective heating coil was designed for the automatic hull forming system based on the results of induction heating simulation. For the purposes of a future study, if an algorithm to obtain optimal working conditions is developed, automatic systems for hull forming can then be constructed.

Local Heating of an Injection Mold using Selective Induction Heating (선택적 유도가열을 사용한 사출금형의 국부가열기술)

  • Do, Bum-Suk;Park, Jung-Min;Eom, Hye-Ju;Park, Keun
    • Proceedings of the KSME Conference
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    • pp.1119-1123
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    • 2008
  • High-frequency induction is an efficient way to heat mold surface by electromagnetic induction in a noncontact procedure. It has been recently applied to the injection molding of thin-walled parts or micro/nano structures. Though the induction heating has an advantage in terms of its rapid-heating capacity on the mold surface, it still has difficulty in efficient mold temperature control due to the restriction of an induction coil design suitable for the given mold shape. The present study proposed a localized mold heating method by means of selective use of mold material. For localized induction heating, an injection mold composed of ferromagnetic material and paramagnetic material is used. The electromagnetic induction concentrates on the ferromagnetic material, from which we can selectively heat for the local mold elements. The feasibility of the proposed heating method is investigated through an experimental measurement in terms of the heating efficiency on the localized mold surface.

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Simulation of Thick Plate Preheating Process Using Induction Heating (유도가열을 이용한 후판 예열공정 시뮬레이션)

  • Oh, Yong Hee;Cho, Young Tae;Jung, Yoon Gyo
    • Journal of the Korean Society for Precision Engineering
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    • v.32 no.12
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    • pp.1017-1021
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    • 2015
  • Induction heating has been applied to the preheating process in various industrial fields. It has been used as a simple device structure, limiting the heating zone through controlled variables, and free-welding positions. It would be helpful to weld thick plates with arc welding such as GMAW. The induction heating process is well suited to this process. In this study, in order to find suitable induction heating parameters, a simulation was conducted with multi physics S/W. Three kinds of material were heated by induction coils designed specially for thick plate. Consequently, steel and nimonic alloy were the most efficient materials for preheating by induction. It can be concluded that the induction heating process is a good method for preheating the thick plate.

Induction Heating PWM High Frequency Inverter using New Active Auxiliary Resonant Snubber

  • Mun, Sang-Pil;Kim, Chil-Ryong;Lee, Jong-Kurl;Kim, Hong-Sin;Jung, Sang-Hwa;Kwon, Soon-Kurl
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.3
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    • pp.40-51
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    • 2008
  • This research presents a new active auxiliary resonant snubber with for induction heating PWM high frequency inverter solving the problem of induction heating PWM high frequency inverter circuit which is using widely in the practical application of an induction heating apparatus, the soft switching operation and power control are impossible when the lowest power supply in the active auxiliary resonant snubber with for induction heating PWM high frequency inverter. The inverter circuit which is attempted by the on-off operation of a switch has the effect of reducing the power loss due to soft switching and high frequency switching. This confirms that power regulation is possible on a continuous basis from 0.25[kW] to 2.84[kW] where the duty factor(D) changes from 0.08 to 0.3 under zero current switching which operates by an asymmetrical pulse width modulating control. The power conversion efficiency is 95[%]. Due to these results, the active auxiliary resonant snubber for an induction heating PWM high frequency inverter is considered effective as a source of induction heating.

Three-Dimensional Analysis of Induction Heating Roll (교류 유도가열의 특성해석)

  • Jang, S.M.;Jin, S.K.;Cho, S.K.;Park, H.C.
    • Proceedings of the KIEE Conference
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    • pp.71-73
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    • 2002
  • The Induction heating is used in various industry and ever-increasing number of applications. The heating roll, which is a kind of induction heating, widely used in curing of coatings and fiber industry. In this papaer, we analized thermal characteristic of induction heating roll by three dimensional eddy-current analysis. Using this analytic results, We could predict the thermal distribution of induction heating roll.

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