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김근영(Kunyoung Kim),장순근(Soongeun Jang),정현섭(Hyunsup Jung),오강세(KangSae Oh),윤재정(JeaJung Yun),박춘달(Chundal Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.4
Vehicle Sill side made of a thin sheet of steel has been constructed using Roll forming technology with the aim of ensuring occupant safety in the event of a side collision. This technology has been used to increase the strength of the vehicle body parts and to reduce the weight of the door impact beam as well as the number of work processes. However, Roll forming process is very difficult because of the inherent complexity of the process. For this reason, the FEM(Finite Element Method) is one of the computer analysis. it is used for Roll forming design. This study, Mechanical tests were performed to determine the material properties of the sill side specimen and the results of the tests were used as input data in stamping and structural simulation in order to obtain the optimal design of sill side.
김근영(Kunyoung Kim),장순근(Soongeun Jang),정현섭(Hyunsup Jung),오강세(KangSae Oh),윤재정(JeaJung Yun),박춘달(Chundal Park) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.4
Vehicle Sill side made of a thin sheet of steel has been constructed using Roll forming technology with the aim of ensuring occupant safety in the event of a side collision. This technology has been used to increase the strength of the vehicle body parts and to reduce the weight of the door impact beam as well as the number of work processes. However, Roll forming process is very difficult because of the inherent complexity of the process. For this reason, the FEM(Finite Element Method) is one of the computer analysis. it is used for Roll forming design. This study, Mechanical tests were performed to determine the material properties of the sill side specimen and the results of the tests were used as input data in stamping and structural simulation in order to obtain the optimal design of sill side.
실사이드 부품의 롤포밍공정에서 고주파유도가열 부가조건에 따른 기계적 특성 및 미세조직 평가
김근영(Kun-Young Kim),최이존(Lee-Jon Choy),신현일(Hyun-Il Shin),조준행(Jun-Haeng Cho),이창훈(Chang-Hoon Lee),강명창(Myung Chang Kang) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.6
Hot stamping processes are possible for tensile strength 1.4 GPa but the strength reduction is appeared from the cooling performance unbalance. And the strength of roll forming process is below than that of hot stamping process owing to using the steel which is lower strength of boron steel. In this study, We provide roll forming process asssisted high-frequency induction heating to solve the problem of conventional one. The experiments were carried out at under various sill side part conditions: high-frequency induction heating conditions of 15, 18, 21, 24, 27 and 30 kW. The high-frequency induction heating temperature was checked with Infrared camera and the sill side parts of mechanical properties and microstructure were measured. The heating temperature of high frequency induction was measured to max 850 ℃ under the coil power of 30 kW. The tensile strength was 1.5 GPa and hardness was 490 Hv. The martensite structure was discovered under coil power of 30 kW. The weight of steel material sill side having thickness 1.5 mm and the boron steel sill side having thickness 1.2 mm were compared to weight effect. The boron steel sill side reduced 11.5% compared to steel. Consequently, manufacturing process of 1.5 giga-grade’s sill side part was successfully realized by the roll forming assisted high-frequency induction heating methods.
측면 충돌 시 점 용접을 이용한 센터 필러 및 사이드 실 사이의 조인트 강성 연구
선찬웅(Chanwoong Sun),김동석(Dongseok Kim),방용식(Yongsik Bang) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The center pillar lower joint between center pillar and side sill normally is connected by spot welds. The joint should have enough stiffness to resist a side impact. When the spot welds are detached, the deformation mode shows totally different collapse mode so that the spot weld failure modeling is important to correlate physical test. In this study, the sheet metal failures around the nugget are modeled using strain-based criterion. The sheet metal around nugget are modeled to have regular mesh. Lap shear coupon tests were conducted to define strain failure criteria. This modeling technique has been correlated with side impact test.
1180㎫급 초고장력 강판의 자동차 Sill Side 부품트리밍 금형 개발
차승훈(S. H. Cha),안민수(M. S. Ahn),남재두(J. D. Nam),서판기(P. K. Seo),원광우(K. W. Won),김병민(B. M. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
In order to reduce the weight and improve the crash performance of the vehicle, advanced high strength steel of DP980, CP1180 have widely used in the automotive industry. However, the high strength achieved in the press parts causes severe tool wear or failures, such as adhesion, chipping and fracture at the tool cutting during the trimming and piercing. These result in the excess burr which deteriorates the tool life and causes serious problem in the product quality. The objective of this study is to develop the trimming die of automotive sill side part with advanced high strength steel of CP1180 which will enhance the tool life and meanwhile to achieve good product quality. Clearance is important parameter in the trimming and piercing. FE-analysis is performed to investigate the effect of clearance on the failure of trimming die. As a result of FE-analysis, the characteristics of sheared edge are evaluated with regard to clearance when trimming CP1180. Also, the trimming die of automotive sill side part with CP1180 is manufactured for evaluating the failure on the sheared edge of the die and the burr of part after 5,000 strokes.
이춘수(Choon Soo Lee),이민희(Min Hee Lee),김상우(Sang Woo Kim),박봉현(Bong Hyun Park) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Polypropylene (PP)/clay nanocomposite was developed for Side Sill Molding and its properties were studied. First of all, the composition was optimized for the mechanical property balance and the part dimension. In comparison with the talc-filled polypropylene composite in mass production, nanocomposite shows the enhanced properties such as the multiaxial impact strength at a low temperature and the weldline strength. Lower filler content in nanocomposite caused weight reduction in Side Sill Molding by about 20%.
형상정밀도 예측을 위한 780MPa급 차체부품의 스프링백 해석
최현준(H. J. Choi),전용준(Y. J. Jun),김세호(S. H. Kim),김기풍(K. P. Kim),김동환(D. H. Kim),임용희(Y. H. Lim) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Finite element stamping analysis is carried out for the side sill inner member of an auto-body with a 780 MPa-grade high strength steel sheet in order to predict the spring-back phenomena accurately. The springback mechanism is investigated in the cross section of the stamped product quantitatively and the amount of the compensation angle is predicted to correct the unexpected shape inaccuracy. Parameters for the accuracy measurement such as gap and flush are calculated in the simulation and it is confirmed that the simulation result shows good agreement with the experimental one within ±1 mm tolerance.