• CN:11-2187/TH
  • ISSN:0577-6686

›› 2010, Vol. 46 ›› Issue (11): 165-171.

• 论文 • 上一篇    下一篇

基于接触理论的高速精密压力机预紧力研究

何敏;孙智   

  1. 徐州工程学院机电工程学院;西北工业大学材料科学与工程学院;中国矿业大学材料科学与工程学院
  • 发布日期:2010-06-05

Research on Pre-tightened Loads of the High-speed Precision Press with Contact Theory

HE Min;SUN Zhi   

  1. College of Mechanical Science and Engineering, Xuzhou Institute of Technology College of Materials Science and Engineering, Northwestern Polytechnical University College of Materials Science and Engineering, China University of Mining&Technology
  • Published:2010-06-05

摘要: 为研究高速精密压力机组合式预应力机身预紧力,利用接触力学和有限元法对存在于机身接触面的接触非线性问题进行研究。选择拉格朗日乘子法作为接触算法,结合预紧力单元将机身作为一个系统来进行研究,采用预置条件共轭梯度解法对各预紧力工况下的机身模型进行求解,并论述增量理论和拉格朗日乘子法在此类问题中的求解。对具体算例进行分析,根据计算结果总结出预紧力-变形关系图,得出结论:预紧力取值应为3.2 MN。计算结果与试验结果呈现较好的一致性,在该预紧力下压力机下死点动态精度可保持在微米级,组合部位接触面不会出现错移;证明采用接触单元结合预应力单元求解组合式预应力机身接触问题的研究方法可用于高速精密压力机预紧力问题的研究。

关键词: 闭式组合机身, 高速精密压力机, 有限元法, 预紧力

Abstract: To research the pre-tightened loads of the close-combined pre-tightened frame in high-speed precision press, the contact mechanics and the finite element method are employed to explore the non-linear contact problems. For application of the pre-tightened force elements, the precondition conjugate grads solution and Lagrange multiplier algorithm, the finite element analysis models of combined frame are built up to find available pre-tightened value. The increment theory and Lagrange multiplier algorithm about non-linear problem are further discussed. The relationship between pre-tightened load and press deformation are illustrated, and the appropriate pre-tightened loads should be 3.2 MN. The proposed model is validated through the comparison between numerical and experimental results. Under the pre-tightened loads, the dynamic precision of low dead-point can keep within micron-scale and the frame doesn’t offset. The computed and experimental results indicate that the research methods using the contact elements and pre-tightened force elements to compute the contact problem in combined frame can be used to research pre-tightened loads in similar closed combined pre-tightened frame.

Key words: Closed combined frame, Finite element method, High-speed precision press, Pre-tightened force

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