• CN:11-2187/TH
  • ISSN:0577-6686

›› 2011, Vol. 47 ›› Issue (14): 20-25.

• 论文 • 上一篇    下一篇

基于理想成形理论的多工步板料成形有限元分析

刘维;吴建军   

  1. 西北工业大学现代设计与集成制造技术教育部重点实验室
  • 发布日期:2011-07-20

Finite Element Analysis of Multi-step Sheet Metal Forming Based on Ideal Forming Theory

LIU Wei;WU Jianjun   

  1. Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education, Northwestern Polytechnical University
  • Published:2011-07-20

摘要: 针对多步有限元分析在多工步板料成形应用中的几个关键问题,基于塑性理想成形理论建立有限元法,并运用基于几何展开法的双展开平面映射法获得迭代初始猜测值;采用三套坐标系与两种坐标转换的策略,将全局三维计算问题转化为局部的二维计算,控制中间三维构型网格节点在有限元方程迭代求解过程中始终保持在滑移面上运动;在塑性形变理论的基础上,提出一种符合多工步成形过程的本构关系处理方法,充分考虑卸载过程对多步模拟的影响;采用自主开发的一步法、多步有限元分析程序和商用的增量法有限元软件,分别对复杂圆筒形多步拉深零件进行模拟分析,对比结果表明,多步有限元分析在对多工步成形零件成形性能的早期预测中是有效的。

关键词: 板料成形, 多步反向模拟, 滑移面

Abstract: In view of the key issues on the application of multi-step finite element analysis for multi-step sheet forming, the finite element method is presented on the basis of plastic ideal forming theory, and double spread plane mapping method based on the geometric spreading method is proposed to obtain the initial guess value for iterations; the strategy of three coordinate systems and two kinds of transforming is adopted to convert the global three dimensional computational problem into the local two dimensional one and the mesh nodes of three dimensional intermediate configuration are kept moving on the sliding surface during the iterative solution; on the basis of the plastic deformation theory, a method to deal with the constitutive relation is suggested to conform with the multi-step forming process, and the influence of unloading processes on the multi-step simulation is taken into account comprehensively; a complex cylinder deep-drawing part is simulated and analyzed by using the independently developed one-step method, multi-step finite element analysis program and commercial incremental FEM software respectively, the results show that multi-step finite element analysis is the most effective one in the early prediction for the formability of multi-step forming parts.

Key words: Multi-step inverse simulation, Sheet metal forming, Sliding surface

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