数控弯管管材成形三维有限元分析

Three-dimensional Finite Element Analysis of CNC Bending Pipe

以CNC数控弯管管材复杂空间成形的工程问题为背景,用三维弹塑性大变形理论来研究和分析管材在特定模具下的成形过程,并且编制了三维弹塑性大变形有限元程序。实现了管材弯曲成形过程的模拟,获得了设计模具和确定工艺参数的有关参考数据。通过实际管材在CNC弯曲过程中的计算,得到内部应力、应变分布及变形。再通过有限元分析,对于模具设计、弯管数据的修正,管材的材质、直径、壁厚的选取,以及加工中管材的弯裂、管壁起趋等现象的控制,提供了可靠科学的理论依据,提高经济效益。

In the light of constration of pipe be complicated deformed by CNC bending, this thesis studies and analysised the pipe, on which the partiular model is deformed, based on the threedemensional elastoplastic large deform hypotheses. So the whole modle computing produce of bending pipe deformed is gotten out, and a lot of reference data are given out which can be used to project model and affirm technology data. This programme can be applied universally and can be use to anyalsis some kinds of pipe. Practice pipe of CNC bending compute, gained the interior stress?the distributing stran and deform are gained. The result of Finite Element Analysis provides credibility and scientific theory base for designing mould,modifing the bending data,choosing pipe of material and diameter thickness. 