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Plasticine을 이용한 Clinching 접합 조건 연구
권승오(Seung O Kwon),김봉준(Bong Jun Kim),장정환(Jang Jeong Whan),최경호(Choi Gyoung Ho),문영훈(Young Hoon Moon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10
The clinching process is one of the joining method by one step in which sheet metal parts are deformed locally and joined without bolting or welding. Final deformed shape of sheet metal in clinching process is very important point to take the mechanical restriction force. In this study, deformed shape was optimized through FEM analysis for joining conditions and parameters. FEM analysis was compared with friction coefficient, drawing depth, punch radius or die radius by using DERORM-2D™ program. Moreover analysis results were used to develop physical modeling device using the plasticine.
이재호(Jae Ho Lee),장정환(Jeong Hwan Jang),이혜경(Hyae Kyung Yi),권승오(Seung O Kwon),문영훈(Young Hoon Moon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.6
Sheet or plate bending is one of the most important industrial metal forming processes. And considerable attention has been focused on gaining a better understanding of many bending characteristics. One of default in bending process is springback. In this study, the springback characteristics of cold rolled steel in U-bending process was investigated. The cold rolled strips were consisted of 3types of thickness(1.2t, 1.4t, 1.8t) combination SPFC780 sheet to obtain the effect of different thickness combination on the springback and three different material strips, (SPFC590, SPFC780, SPFC980), to investigate the influence of different mechanics properties on springback. Three punch profile radii of 3, 9 and l2㎜ were used. As results, the springgo aspect could be observed experimentally in the small punch profile radius. And suggested analytical model results were compared with experimental results.
주병돈(Byeong Don Joo),이혜경(Hyae Kyung Yi),장정환(Jeong Hwan Jang),권승오(Seung O Kwon),문영훈(Young Hoon Moon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.6
Hydroforming is one of the useful processes in the automotive industry and recently for to improve the fuel efficiency, automotive industry focus on weight reduction. Aluminum alloys are light and has high structural rigidity, the need for hydroforming of aluminum alloy is increased. In this study, hydroformability and fracture criteria of FE analysis based on ductile fracture were investigated in warm hydro forming of Al 6061 tube and to evaluate the hydroformability, un i-axial tensile test and bulge test were performed at room temperature and 200℃. The measured flow stresses were used as input parameters for FE analysis, the damage values were calculated by FE analysis based on ductile fracture criteria at maximum radius of free bulged tubes, and damage values were compared of hexagonal shaped hydroformed parts.