Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (9): 53-58.doi: 10.3969/j.issn.1000-565X.2014.09.010

• Mechanical Engineering • Previous Articles     Next Articles

Shape Control of Parts Formed by Means of Flexible 3D Stretch- Bending Technology

Gao Song Liang Ji- cai Teng Fei Chen Guang- yi Wei Zhi- yong   

  1. State Key Laboratory of Structural Analysis for Industrial Equipment∥ School of Automotive Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China
  • Received:2014-04-18 Revised:2014-06-30 Online:2014-09-25 Published:2014-08-01
  • Contact: 梁继才(1960-)，男，博士，教授，主要从事车用结构件现代成形技术研究． E-mail:liang_jicai@yahoo.com.cn
  • About author:高嵩(1987-)，男，博士生，主要从事铝型材三维拉弯成形技术研究．E-mail:gao_song@mail．dlut．edu．cn
  • Supported by:

    国家工信部重点产业振兴和技术改造专项(吉工信投资［2011］350)

PDF

529

Abstract:

In this paper,the flexible 3D stretch- bending (FSB) process is investigated,and the mathematicalexpressions of the formed parts are put forward.Then,a method to adjust the flexible fundamental units (FFU)and a calculation algorithm of clamp stretch- bending trajectories are proposed by analyzing the deformation processin the horizontal and vertical directions.By considering the multipoint control of the FFU envelop shape,theadjustment parameters of multi- points dies (MPD) are defined,and the geometric relationship between the FFUand the workpiece is established.Moreover,an interpolation method based on cubic B- spline is presented todescribe the envelop shape of MPD.Based on the above- mentioned geometric relationship and MPD adjustmentparameters,the arc stretch- bending trajectories of the clamp are calculated.Finally,3D stretch- bending experi-ments of the L- section aluminum profile are conducted.The results show that the formed part is of a measured con-tour error of less than 0.7%,which indicates that the proposed methods are practical.

Key words: metal forming, 3D stretch- bending, multi- points forming, shape control, stretch- bending trajectory