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이목영(Mok-Young Lee),장웅성(Woong-Seong Chang),윤병현(Byung-Hyun Yoon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Strip casted and rolled magnesium sheet is become exiting material for car manufacturer, due to its better formability and specific strength compare with conventional extruded sheet. TWB technology was attractive for car body designer, because it saves the weight of the car without strength loss. In this study, the laser welding performance of magnesium sheet was investigated for Mg TWB panel manufacturing. The material was strip casted and rolled magnesium alloy sheet contains 3 wt% Al and 1 wt% Zn (AZ31). Lamp pumped Nd:YAG laser of 2kW was used and its laser light was delivered by optical fiber of 0.6mm core diameter to material surface with focusing optics of 200mm focal length for TWB welding. The microstructure of weld bead was investigated to check internal defects such as inclusion, porosity and cracks. Also mechanical properties and formability were evaluated for press forming of car body. For the results, there was no crack but inclusion or porosity on weld at some conditions.The tensile strength of weld was over 95% of base metal. Inner and outer panel of engine hood were press formed and assembled at elevated temperature.
중량 최소화를 위한 자동차 차체의 다중소재 배치 최적설계
박도현(Dohyun Park),김창원(Kim Chang Won),양희원(Yang Heui Won),김대승(Kim Dae Seung),최동훈(Dong-Hoon Choi) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This study treats an optimization of material arrangement to reduce weight of automotive Body In White (BIW). Since production cost can be decreased and fuel efficiency and ride & handling performance can be improved by reducing weight of automobile, weight reduction of the automobile is steadily tried in automobile industry. Especially, weight reduction of BIW made a great contribution to the total weight reduction, since BIW takes a large portion of total weight. This study aims to reduce weight of the automotive BIW by appropriate selection of steel, aluminum and magnesium for each panel consisting of BIW. To carry out material arrangement optimization, we formulate a design problem to reduce weight of BIW while satisfying constraints about bending and torsional stiffness and carried out metamodel-based design optimization.
민경선(Kyungsun Min),김남수(Namsu Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Parts of automobile body are equipped with numerous nuts or holes. These are an assemble reference between parts. If these are not assembled at right position, other parts cannot be assembled or the parts of the automobile body cannot be operated properly. Thus, measurement of the displacement of the nuts or holes locations can be very important. And measurement data should be informed to workers of administrators to correct defects. However, the domestic automobile company has little concern for the investment on measuring system to solve problem. Regard to this matter Ssangyong Motor Co. has been operated an auto gauging system developed by a measurement system company to improve quality of the door open/close on C200 project. From results of the operation, the manufacturing unit found out that preservation and correction is easier. But expense of importation and storage of spare parts needed to be improved. Thus, necessity of selection of proper sensor and development of mechanical and control system required to apply on self manufacturing line. This research discusses a development of automatic measuring system of a displacement of nut position, which affects the gap and flush on a hood. Also this research discusses factors to be improved occurred at the self manufacturing line and results of accuracy test.
박도현(Dohyun Park),진성완(Sungwan Jin),이갑성(Gabseong Lee),최동훈(Dong-Hoon Choi),김대승(Dae Seung Kim),양대호(Daeho Yang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This research treats the optimization of the material arrangement. To improve fuel efficiency and driving performance and to reduce production costs, an effort to reduce the weight of a vehicle has been steadily tried in automotive industry. Since the weight of BIW takes up a large portion of the total weight of a vehicle, reducing the weight of BIW greatly contributes to reducing the total weight of a vehicle. In this research, we formulate a design problem to minimize the weight of the BIW while satisfying design requirements about bending and torsional stiffness and establish a Metamodel-based design optimization strategy to solve the design problem. As a result of the optimization, we obtain weight reduction by 46.9% while satisfying all design requirements.
중량 최소화를 위한 자동차 차체의 소재배치 및 두께 최적화
박도현(Dohyun Park),이갑성(Gabseong Lee),최동훈(Dong-Hoon Choi),김대승(Dae Seung Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In this study, an optimization of the material arrangement and thickness for minimizing automotive BIW weight was carried out. To improve fuel efficiency and reduce production cost, automotive industry has steadily tried to reduce the vehicle weight. Since the BIW weight takes up a large portion of the total vehicle weight, reducing the BIW weight greatly contributes to reducing the total vehicle weight. There have been studies aiming at reducing the BIW weight by changing thickness or introducing new lightweight materials. In this study, we took both thickness and material arrangement as design variables to enhance reducing the BIW weight. We first formulated a design problem of minimizing the BIW weight while satisfying design requirements on bending and torsional stiffness values. Then, we proposed a metamodel-based design optimization process to solve the posed design problem. Successful design optimization resulted in weight reduction by 30.6% while satisfying all design requirements.