缠绕拉拔式弯管过程中弯头截面变形的有限元分析

Numerical Analysis of Manufacturing Technique of Twisting-drawing Pipe Bending

采用有限元方法模拟了缠绕拉拔式弯管成形过程中弯头部分截面椭圆度的变化,实测了90°和180°弯头的截面椭圆度,计算结果与实测结果吻合良好。通过模拟发现,弯头截面变化存在明显的过渡区,椭圆度最大的截面位于过渡区结束的部位。在采用剖分式模盘时,合模力与反变形是影响弯头截面椭圆度的两个主要因素。分析了不同弯曲角度、合模力、反变形对弯头截面椭圆度的影响。

The general-purpose FEM software ANSYS is used to analyze the manufacturing technique of the twisting-drawing pipe bending. The ellipticity of pipe cross-section and the effect of bending angle on the cross section ellipticity are studied. The key factors affecting the ellipticity of bending pipe are also investigated briefly.