• CN:11-2187/TH
  • ISSN:0577-6686

›› 2014, Vol. 50 ›› Issue (10): 72-79.

• 论文 • 上一篇    下一篇

多夹钳式柔性拉伸成形时过渡区长度的研究

王友;李明哲;彭赫力   

  1. 吉林大学无模成形技术开发中心
  • 发布日期:2014-05-20

Study on Transition Length in Multi-gripper Flexible Stretch Forming Process

WANG You;LI Mingzhe;PENG Heli   

  1. Dieless Forming Technology Center, Jilin University
  • Published:2014-05-20

摘要: 多夹钳式柔性拉伸成形是一种新型的柔性成形工艺。以球形曲面件为研究对象,建立多夹钳式柔性拉伸成形时的有限元模型;对比分析不同过渡区长度对成形力、应变分布、厚度分布及回弹的影响,同时分析应变值及应变分布状态对成形件回弹的影响。结果表明,多夹钳式柔性拉伸成形时,过渡区长度越小,板料越容易贴模,所需的成形力越小,成形件的应变及厚度减薄越小,并且应变及厚度分布越均匀,越显著提高成形件质量;尤其是在过渡区长度为0时也能够圆满地完成板料成形,显著提高材料利用率,节省制造成本。另外与增加应变大小相比,提高应变均布程度可以更有效地减小回弹,在自主研发的多夹钳式柔性拉伸成形机上对数值模拟结果进行试验验证。

关键词: 柔性成形;拉伸成形;数值模拟;过渡区;回弹

Abstract: Multi-gripper flexible stretch forming(MGFSF) is a new innovation of flexible forming. Spherical part is selected as the research object and finite element models of MGFSF are built. The effects of different transition zones on forming force, strain and thickness distributions, and springback of the formed parts are analyzed comparatively. The effects of strain values and strain distribution conditions on springback are also analyzed. The simulation results reveal that the shorter the transition length is, the smaller the forming force is and the easier for the metal sheet gets shape of the die. Furthermore, the shorter the transition length is, the smaller the strain and the thickness reductions will be, in addition, the higher uniformity of the strain and thickness distributions will be. In particular, the metal sheet can get the desired shape without transition zone with MGFSF, which significantly improves the utilization of materials and saves the manufacturing costs. It is also founded that, improving the uniformity of strain distribution has a more effective reduction in springback compared with increasing the strain values. The experimental validation is conducted on the self-developed MGFSF machine.

Key words: flexible forming;stretch forming;numerical simulation;transition zone;springback

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