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Multi-point forming springback compensation control oftwo-dimensional hull plate
Advances in Mechanical Engineering ( IF 2.1 ) Pub Date : 2020-04-20 , DOI: 10.1177/1687814020916094 Shaojuan Su 1, 2 , Yuchao Jiang 1 , Yeping Xiong 2
Advances in Mechanical Engineering ( IF 2.1 ) Pub Date : 2020-04-20 , DOI: 10.1177/1687814020916094 Shaojuan Su 1, 2 , Yuchao Jiang 1 , Yeping Xiong 2
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The formation of hull shells, especially of large curved shells, has always been a most difficult problem in the field of plastic hull processing. The simple and effective shaping of ship plates with different thicknesses and curvatures to meet design requirements has always been the development direction of hull plate-forming technology. For a long time, two-dimensional parts, such as cylindrical and conical parts, have been formed by rolling or bending shown in Figure 1.1,2 When the bending resistance of the roller is relatively large, the roller will be distorted and deformed so that the processed workpiece is in the shape of a barrel. Therefore, when roller process a relatively thick material with a relatively high material strength, it is necessary to increase the support or make the shape of the roller barrel offset the effect of its deformation.3 At the same time, the traditional symmetrical three-roller coiling machine has a straight edge problem at both ends of the sheet, so the sheet material is pre-bent.4 Three-dimensional curved parts are mostly formed by water-fired curved plates, but there are many problems with this approach, such as high labor intensity, high requirements for workers, and low production efficiency. With the development of the computer numerical control (CNC) cold bending machine, multi-point CNC cold press forming has gradually become the main process in sheet metal forming.5 The asymmetric stamping square head adjustable die shown in Figure 2, developed by Wuhan University of Technology in China in 2012, can solve the indentation and wrinkling problems that easily occur in the cold forming process; at the same time, compared with the overall die, the height of each basic body punch can be arbitrarily adjusted, and the envelope surface of different shapes can be quickly formed, and the springback of the sheet forming can be compensated by correcting the shape of the envelope surface, that is, the die-repairing process of the whole die is omitted. Multi-point forming has the advantage of reducing costs, increasing production efficiency, and automating the forming process.6 However, calculating springback has always been a technical problem in sheet metal forming.
更新日期：2020-04-20
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