芯棒形式对铜管绕弯成形质量影响的仿真研究

Finite Element Analysis to Mandrels in Rotary Draw Bending of Copper Tube

利用仿真技术对薄壁铜管绕弯成形中圆头、关节、曲面3种形式的芯棒对弯管质量的影响进行了研究。建立了基于显示算法的铜管弯管有限元仿真模型,并对模型进行了试验验证。验证结果表明,动力显式算法仿真模型可以较好地对铜管绕弯成形过程进行模拟。利用该模型,对空调铜管弯曲成形常用的圆头芯棒、曲面芯棒和关节芯棒进行了仿真对比,分析了芯棒形式对成形关键参数——厚度减薄和截面畸变的影响。仿真分析结果表明:圆头芯棒最有利于减轻厚度减薄的情况;关节芯棒最有利于保持铜管截面形状;曲面芯棒有利于得到综合性能更好的弯管。研究结果为工程应用中芯棒形式的选择提供了理论依据。

In bending of thin-walled copper tubes, two main problems affects the quality of the tube bended, the reduction of the wall-thickness of the outer side and the fattening of the cross-section. However, both of them are directly affected by choosing different types of mandrels. Therefore, understanding of the issues that what kind of mandrel is suitable for copper tube bending is worthy of investigation.This paper examined the three basic types of mandrels and their effects to quality parameters of copper tub...