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고주파 유도 후판 선상가열 공정에서 열원 이동속도의 영향
엄득하(D. H. Eom),이광석(K. S. Lee),김병민(B. M. Kim),이정환(J. H. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
Temperature distribution over the SS400 carbon steel plate during the induction-based line heating process is firstly analyzed by a numerical method by electromagnetic-thermal coupling analysis. To verify the effectiveness of the numerical analysis results, actual line heating-induced deformation process was carried out by applying newly designed laboratory-scale high frequency (HF) induction heating (IH) equipment capable of bending thick plate with the moving accuracy of ±0.1 ㎜ in heating coil position. Comparison of the analytical result with experimental counterpart showed a very good correlation. In this way the effect of moving speed of heating source on the temperature distribution were subsequently confirmed.
단일 패스 고주파 유도 선상 가열에 의한 조선용 후판 온도 분포 및 변형거동 연구
엄득하(D. H. Eom),이광석(K. S. Lee),이정환(J. H. Lee),김병민(B. M. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
In the present study, laboratory-scale high frequency induction heating equipment capable of bending thick plate was firstly demonstrated with the moving accuracy of ±0.1 ㎜ in heating coil position. Temperature distribution over thick SS400 carbon steel during the high frequency induction heating process was analyzed by electromagnetic thermal coupling analysis. Comparison of the analytical result with experimental counterpart showed a very good correlation. The effects of induction heating parameters such as input power and moving speed of heating source on the temperature distribution were subsequently confirmed. High frequency induction heating-induced permanent bending for thick steel plate was also discussed in terms of z-axis displacements.
고주파 유도 가열에 의한 후판 단일패스 선상가열 유기 변형 특성
엄득하(D. H. Eom),이광석(K. S. Lee),이정환(J. H. Lee),김병민(B. M. Kim) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Temperature distribution over the SS400 carbon steel plate during the induction-based line heating process is firstly analyzed by a numerical method by electromagnetic-thermal coupling analysis upon different input power and moving speed, and subsequent plastic deformation along z-axis was again expected by thermal-structural coupling analysis. To verify the effectiveness of the numerical analysis results, actual line heating-induced deformation process was carried out by applying newly designed laboratory-scale high frequency (HF) induction heating (IH) equipment capable of bending thick plate with the moving accuracy of ±0.1 mm in heating coil position. Comparison of the analytical result with experimental counterpart showed a very good correlation.
고주파 유도 가열에 의한 후판 멀티패스 선상가열 유기 변형 특성
엄득하(D. H. Eom),이광석(K. S. Lee),김창원(C.W. Kim),변상윤(S.Y. Pyun),김병민(B. M. Kim),이정환(J. H. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
In this study an approach, based on three-dimensional electromagnetic-thermal-structural coupling numerical analyis, was utilized for the prediction of temperature distribution and subsequent permanent deformation over the SS400 carbon steel plate during the induction-based line heating process. Also experimental line heating was carried out by applying newly designed laboratory-scale high frequency (HF) induction heating (IH) equipment capable of bending thick plate with the moving accuracy of ±0.1 mm in heating coil position. The comparison of the numerical calculation with corresponding experimental results showed a very good correlation. The amount of permanent deformation was obviously increased upon decreasing moving speed and increasing input power adopted in this study. Furthermore, the influence of secondary line heating upon the curvature of the workpieces is also discussed.
공압식 폐쇄다이세트 적용 정밀단조공정 설계 및 해석기술
이광석(K. S. Lee),엄득하(D. H. Eom),강성훈(S. H. Kang),이정환(J. H. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
This paper describes design and analysis techniques of cold forging process for precise producing of T-200 type spider made of SCr420H by utilizing pneumatically operated enclosed die set. Since deducing feasible closing force is an important factor to optimize entire pneumatically operated cold forging system, a series of FE analyses with varying the number of gas cylinders has been carried out to investigate the influence of closing force upon the direction of applied load at die surfaces. It also reveals the optimum distribution of the gas cylinders in terms of the flatness of upper/lower plates.