Finite element analysis on wrinkle during process of continuous multi-point forming

被引：0
|
作者：
Gong X. [1 ]
Li M. [1 ]
Hu Z. [1 ]
机构：
[1] Dieless Forming Technology Center, Jilin University
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2010年 / 46卷 / 22期
关键词：
Flexible forming; Numerical simulation; Sheet metal forming; Three-dimensional surface;
D O I：
10.3901/JME.2010.22.031
中图分类号：
学科分类号：
摘要：
Wrinkling is a crucial forming defect in continuous multi-point forming process. Principle of continuous multi-point forming is explained. Finite element analysis model of spherical surface is established. Numerical simulation method is adopted to study the wrinkling. Simulation result of wrinkle of 08Al sheet metal with 0.5 mm thickness during forming process is obtained. The result shows that wrinkles happen on two sides and two ends of sheet metal. Reasons for wrinkles happening and not happening are analyzed by use of principal strain states of shell element middle surface in different regions of sheet metal. Simulation results of wrinkles on ends of 08Al sheet metal with 0.5 mm, 1.0 mm, 1.5 mm and 2.0 mm thickness under different displacements of upper flexible roller are obtained. The results show that when thicknesses of sheet metal are identical, the deeper the displacement of upper flexible roller is, the more serious the wrinkles will be; when displacements of upper flexible roller are identical, the thicker the sheet metal, the more difficult the happening of wrinkles. The change rule of wrinkles on ends of sheet metal is analyzed and explained reasonably. Experiments are carried out. Experimental results basically agree with simulation results. © 2010 Journal of Machanical Engineering.
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页码：31 / 35
页数：4
相关论文
共 11 条
  • [1] Nakajima N., Research on die and electrode by steel wire bind, Japanese Journal of Mechanical Academy, 603, 72, pp. 32-40, (1969)
  • [2] Kitano, Research on universal adjusting machine for the bending of sheet metal, (1961)
  • [3] Nishioka F., An automatic bending of plates by the universal press with multiple piston heads (First report: Basal research), Journal of the Society of Naval Architects of Japan, 132, pp. 481-501, (1972)
  • [4] Nishioka F., An automatic bending of plates by the universal press with multiple piston heads (Second report: Practicality research), Journal of the Society of Naval Architects of Japan, 133, pp. 291-305, (1973)
  • [5] David E.H., David C.G., A variable geometry die for sheet metal forming: Machine design and control, Proc. Jt. Autom. Control Conf., pp. 366-367, (1980)
  • [6] Li M., Fu W., Li X., Et al., Development of a multi-point plate forming machine, Journal of Harbin Institute of Technology, 32, 4, pp. 62-64, (2000)
  • [7] Li M., Su S., Li G., Et al., Development of CAD/CAM & CAT software for dieless forming metal sheets, Journal of China Mechanical Engineering, 10, 3, pp. 298-300, (1999)
  • [8] Li M., Hu Z., Cai Z., Et al., Method of multipoint continuous forming for the freeform surface parts, Chinese Journal of Mechanical Engineering, 43, 12, pp. 155-159, (2007)
  • [9] Gong X., Li M., Hu Z., Numerical simulation of three dimension surface bending by using bendable roller, Journal of Jilin University (Engineering and Technology Edition), 38, 6, pp. 1310-1314, (2008)
  • [10] Hutchinson J.W., Plastic buckling, Advances in Applied Mechanics, 138, pp. 138-144, (1974)
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