A Study of the Optimization of Sheet Metal Drawing with Active Drawbeads |
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| Institution: | 1. Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk 790-784, Republic of Korea;2. Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea;3. Center for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193, Portugal;1. Physics Department, Bu-Ali Sina University, Hamedan 65174, IR Iran;2. Malek Ashtar University, Tehran, IR Iran;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;2. Key Laboratory of Advanced Manufacturing Technology for Automobile Parts, Chongqing University of Technology, Chongqing 400054, China;3. School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China;4. School of Civil, Environmental and Chemical Engineering, RMIT University, GPO Box 2476, Melbourne 3001, Australia;1. Udmurt Federal Research Center, Ural Branch of RAS, Baramzinoy str. 34, 426067 Izhevsk, Russia;2. Udmurt State University, Universitetskaya str. 1, 426034 Izhevsk, Russia;3. Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506, USA;4. School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA;1. Department of Mechanical Engineering, Anna University, Chennai, Tamil Nadu, India;2. Department of Mechanical Engineering, Vel Tech Multi Tech Engineering College, Chennai 600062, Tamil Nadu, India;3. Department of Mechanical Engineering, Sri Sai Ram Institute of Technology, Affiliated to Anna University, Chennai 600044, India;4. Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute, Karaikudi, Tamil Nadu, India |
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| Abstract: | An experimental study is described in which active drawbead technology is used to attempt to optimize the sheet metal forming process. Oval AA 6111-T4 panels were drawn in a series of tests using various drawbead trajectories to establish the feasibility of the approach. The selection of drawbead trajectory was shown to have a dramatic effect on maximum attainable draw depth at fracture. Increasing drawbead penetration from zero to 5 mm in the early stages of the drawing process and retracting midway through the draw resulted in a 40% increase in draw depth compared to using a fixed 5 mm penetration. In the second part of the investigation, active drawbead technology was used to study its effect on highly nonsymmetric panel forming. Drawing limit curves in terms of drawbead depth versus blankholder forces (BHF) were plotted, and different drawbead trajectories were tested to determine an optimal drawbead trajectory scheme. A corresponding finite element model was also created. The results of strain path analysis successfully support the experiments. |
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