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轴对称拉深件多步成形反向模拟技术研究

【作者】 穆瑞芳

【导师】 吴建军;

【作者基本信息】 西北工业大学 , 航空宇航制造工程, 2005, 硕士

【摘要】 轴对称拉深件成形是金属板料成形中的典型方法之一,本文针对该成形过程提出了一种多步成形反向模拟方法,该方法可以对中间工步形状和毛坯形状进行优化,并且可以预测整个零件的应变分布,据此可以了解变形过程中的金属流动规律,在设计初期具有一定的指导作用。 本文以理想变形理论为基础,在平面应力假设下,使用二维膜单元和厚向异性的刚塑性材料模型分析了单元变形关系,得到了各成形工步中以初始构形上的节点坐标为基本未知量的有限元方程。通过求解上述有限元方程即可得到满足理想成形条件的节点坐标,达到优化的目的。 本文使用C++语言编制了反向模拟系统中工程分析模块的计算程序,通过数值实验验证了算法的可执行性和正确性。该算法简单易实现,计算效率高,具有较大的实用价值。

【Abstract】 Axisymetric deep drawing is very important in sheet metal forming processes. In this paper, according to axisymetric deep drawing processes, multi-step inverse simulation method has been presented, which can help to optimize the intermediate shapes and the blank shape and to give some deformation information of the part.Based on the assumption of ideal forming theory and plain stress, the FE equations for axisymetric multi-step deep drawing inverse simulation are formulated with linear membrane element and the rigid-plastic material model. The gained node coordinates will form the contours of the optimum intermediate shapes and blank shape.A program of the inverse simulation system focused on the calculation function has been developed using C++ language. By applying the algorithm to an example, the availability of the method is validated. This method is simple and efficient to be extended.

  • 【分类号】TG386
  • 【被引频次】5
  • 【下载频次】123
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