厚壁不锈钢管弯曲成形试验及其回弹特性分析

Bending Forming Experiment and Analysis of Springback Characteristics on Thick-wall Stainless-steel Pipe

借助数控弯管机,分别完成了壁厚为5.5 mm和3.5 mm不锈钢管材的弯曲成形试验。根据回弹理论,通过弯曲简化模型,进行了管材弯曲回弹机理分析,推导了金属管材弯曲回弹角的工程近似解析公式。利用多目测量机完成了弯曲回弹角的测量,通过数据分析,研究了变形条件及管材结构尺寸对弯曲回弹角的影响规律。结果表明:在单一变量情况下,弯曲回弹角随折弯角的增大而增大;相同规格管材在同一折弯角下,弯曲回弹角随着时间推移持续增大,且回弹角的回弹速度随时间增长快速衰减,回弹主要发生在弯曲完成后的24 h内。文中试验数据及研究结论为厚壁不锈钢管路的弯曲成形及其工程应用提供了参考。

With the help of CNC pipe bending machine,the bending forming tests of pipes with wall thickness of 5.5 mm and 3.5 mm were completed respectively.According to the springback theory and the bending simplified model,the springback mechanism of pipe bending was analyzed,and the engineering approximate analytical formula of the springback angle of metal pipe bending was derived.The bending springback angle was measured with a multi-camera measuring machine.Through data analysis,the influence rule of deformation condition and pipe structure size on bending rebound angle was studied.The results show that the bending springback angle increases with the bending angle in the case of one variable.Under the same bending angle of the same specification pipe,the bending springback angle continues to increase with time,and the rebound speed of the rebound angle decreases rapidly with time.The rebound mainly occurs within 24 h after the bending.The experimental data and the research conclusion provide reference for the bending forming and engineering application of thick wall stainless steel pipeline.