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유한요소해석을 이용한 리튬이온전지용 알루미늄 사각 케이스 충격압출공정의 공정변수 평가
이성원(S. W. Lee),조원후(W. H. Jo),이찬주(C. J. Lee),김형익(H. I. Kim),류호연(H. Y. Ryu),이정민(J. M. Lee) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
This paper was set process variables of impact extrusion process of an aluminum square case and evaluated each of the process variables. FEM analysis was used to investigate the effects of the different process variables on the material flows in Impact extrusion process and finally derived each process variable effects.
이성원(S. W. Lee),조원후(W. H. Jo),이찬주(C. J. Lee),김형익(H. I. Kim),류호연(H. Y. Ryu),이정민(J. M. Lee) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
This paper was designed to develop the cold forging process design of the drive clutch hub part for the automotive air compressor. FE analysis was used to investigate the effects of the different variables on the material flows in cold forging process and finally derived the optimal process design for drive clutch hub part.
정승원(S. W. Jeong),이성원(S. W. Lee),정완진(W. J. Chung),전만수(M. S. Joun) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
In this paper, a reaction-to-die penetration scheme is presented to deal with the force prescribed dies such as the binders in sheet forming or plate forging, the guide plate and counter punch in fine blanking and the spring attached die and back pressing die in forging. A holding force die is employed to define the region where the force is exerted. In the scheme, the holding force is exerted in the material surface in terms of traction which is calculated by a function of penetration depth of material into the die. The scheme is applied to a fine blanking process using a rigid-plastic finite element method. The traction can be regarded as a kind of reaction force to protect the penetration of material into the holding force die. The predictions are discussed to reveal the effect of the reaction-to-die penetration scheme.
바인더 하중부과기법과 입방체요소를 이용한 사각컵 딥드로잉 공정의 유한요소해석
이성원(S. W. Lee),류호연(H. Y. Ryu),정완진(W. J. Chung),전만수(M. S. Joun) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
In this paper, finite element prediction of a cold sheet metal forming process using solid elements and binder force treatment scheme is carried out. A three-dimensional rigid-plastic finite element method with conventional linear tetrahedral MINI-elements is employed together with the binder force imposing scheme. The procedure is applied to the well-known problem of the NUMISHEET93 international benchmark. The resulting predictions are compared with experimental observations found in the literature, and good agreement is noted.
이성원(S. W. Lee),조원후(W. H. Jo),이신호(S. H. Lee),이정민(J. M. Lee) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
This paper was designed to develop the hot forging process design of the LM guide block for the machine tool. FE analysis was used to investigate the effects of the different variables on the material flows in hot forging process and finally derived the optimal process design for LM guide block.
유한요소해석을 이용한 타이타늄 합금(Ti-6Al-4V) 판재의 고온 성형성 평가
이성원(S. W. Lee),조재완(J. W. Jo),이정민(J. M. Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Recently, titanium alloy parts have been actively studied as hot-forming processes in a temperature range where α case is not formed as an alternative to SPF(super plastic forming). This process provides shorter forming time and lower costs than SPF because it is no chemical milling required to remove alpha case in substance. In particular, the formability of Ti-6Al-4V sheet in hot forming process is very sensitivity to forming temperature. Thus, it is very important to clearly define the forming behavior of Ti-6Al-4V sheet at high temperature. This paper was designed to evaluate the high temperature formability of Ti-6Al-4V sheet. First, the behaviors of the material was defined through tensile and anisotropy tests for different temperatures (600 ~ 800°C) and strain rates (0.01 ~ 1.0). Also, the failure criterion of the sheet was judged as FLC(Forming Limit Curve) for various temperatures (600 ~ 800°C). Finally, these characteristics were used for FE simulations of deep drawing and U-bending processes to determine the spring back and drawability of Ti-6Al-4V sheet for different temperature.
유한요소법을 이용한 냉간단조에서 발생하는 주요 결함 사례 분석(2)
이성원(S. W. Lee),변우성(W. S. Byeon),차상렬(S. R. Cha),김봉수(B. S. Kim),전만수(M. S. Joun) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
In this paper, case study on shape defects in cold forging is carried out using a finite element method. The representative defects are found from the related literature or industries. Two different materials, i.e., ESW105 with negligible strain hardening capability SCM435 with typical strain hardening behiviors, are tested for the same problem. The predictions of defect formation are seen through metal flow lines or state variables including effective strain and damage.