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이수철(Soochel Lee),이덕영(Dugyoung Lee),윤재웅(Jaewoong Youn),임구(Goo Lim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, mobility and accessibility are considered for the elder and the handicapped person in the aging problem. A special vehicle which has slide-up seat and wheelchair winch was designed for this purpose. Slide-up scat, which will help boarding and disembark via electric powered seat system, was developed for the elder and the handicapped and the families who got them. Wheelchair winch was also developed for the people who want carrying wheelchair or electric motor scooter in a vehicle. In this paper, the methods to search for critical design factors for safety and comfortableness to use them are described.
최보성(Bosung Choi),황재현(Jaehyun Hwang),백일기(Ilki Baek),최원호(Wonho Choi),이덕영(Dugyoung Lee),안장호(Jangho Ahn) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In recent years, laser-arc hybrid welding has begun to be adopted for assembly welding of automotive bodies and parts, because hybrid welding process can weld lapped steel sheets that have a lager pap than is possible with laser welding. But if the gap is wide, burn-through occurs, and, if the gap is excessive, the two sheets cannot be welded together. For this reason, the gap is very important for hybrid welding. In this paper, to predict the twist deformation by hybrid welding when brackets are welded in B pillar of passenger car, the residual stress using CAE is analyzed and the deformation results of CAE is compared with welded panel.
Sub Pad를 이용한 도어 외판 핸들부 주위 미세면굴곡 저감
김목유(Mokyou Kim),최보성(Bosung Choi),주재혁(Jaehyck Joo),이덕영(Dugyoung Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Surface deflections are generally occurred in door outer handle area or fuel injection area where the shape of its section is changed suddenly. Usually, their basic cause is compressive stress occurred in forming process because of different touching time between die and panel. Surface deflection amounts can be reduced with sub pad which is pressing down around handle area prior to forming concave door handle. New die structure with it is developed and applied to minimize surface deflection amounts through the forming analysis, springback analysis, comparison of surface deflection amounts depending on the parameters and analysis of distances between sub pad and punch depending on padding forces. To analyze effectively surface deflection occurred around door outer handle area, die of door outer panel is manufactured partly containing door handle area. And to determine its proper size, the preceding investigation is executed through the simulations. To compare surface deflection amounts with typical dies and suggested dies with sub pad, simulations according to the process of surface deflection analysis are executed and then 3D scanning is preformed with stamping panel to verify effect of sub pad.
자동차 시트용 랙기어 성형을 위한 파인블랭킹 복합성형공법 개발
홍일성(Ilseong Hong),정창식(Changsik Joung),김우진(Woojin Kim),이덕영(Dugyoung Lee) 한국자동차공학회 2014 한국자동차공학회 지부 학술대회 논문집 Vol.2014 No.4
The fine blanking is a process of stamping which provides thick sheet metal parts with fine sheared edges and close dimensional accuracy over whole material thickness in single blanking operation. The rack gear in automotive seat must have fine sheared surface to prevent noise during adjusting its height and angle. In this paper, fine blanking and bending process were adopted to make tooth face of rack gear using progressive die. Stamping and spring back analyses were done to decide stamping conditions including padding force. For dimensional accuracies of rack gear, angle and offset amount of bending pad in progressive die were corrected several times during trying out die.
Upform 공법을 이용한 사이드 실 인너 패널의 스프링백 저감
최보성(Bosung Choi),김목유(Mokyou Kim),주재혁(Jaehyck Joo),이덕영(Dugyoung Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Springback, an elastic material recovery after the unloading of stamping tools, causes variations and inconsistencies of final part dimensions. The higher the tensile strength of steel sheets goes up, the larger the springback of them occurs. Recently, automotive industry has given much more attention to high-strength steel sheets in order to obtain high fuel efficiency and impact safety. To reduce springback of steel sheets, upform method is proposed. Its main concept is to strike the end of steel sheets normally during stamping process. The feasibility of upform method is verified by stamping analysis of side sill inner panel using PAMSTAMP 2G. The portotype sample panel is made by press steel die and the analysis data is compared with the measurement data of 3D CMM.