锻压技术

工艺参数对弹性模量变化条件下高强不锈钢管绕弯回弹行为的影响

英文标题：Influence of process parameters on springback behavior in rotary draw bending under variable elastic modulus condition for high strength stainless steel tube

作者：方军欧阳芳尚文瑄鲁世强王克鲁向军淮

单位：江西科技师范大学材料与机电学院南昌航空大学航空制造工程学院

关键词：高强不锈钢管回弹弹性模量数控绕弯塑性应变

分类号：TG386

出版年,卷(期):页码：2022,47(11):137-145

摘要：

采用反复加载-卸载拉伸试验获得了高强0Cr21Ni6Mn9N不锈钢管的弹性模量随塑性变形的变化规律，构建了弹性模量与塑性应变之间的函数关系，并嵌入ABAQUS软件中模拟了工艺参数对高强不锈钢管数控绕弯回弹行为的影响，分析了回弹对工艺参数的敏感性。结果表明：弹性模量变化和恒定条件下，工艺参数对高强不锈钢管数控绕弯回弹行为的影响的变化趋势相似，只是弹性模量变化条件下的回弹值增大了；回弹角和回弹半径随着芯棒伸出量、弯曲速度、助推速度的增大或管材/芯棒间隙、管材/弯曲模间隙、管材/弯曲模摩擦因数的减小而减小。回弹半径对工艺参数更为敏感，其敏感性大小依次为：管材/弯曲模间隙、管材/弯曲模摩擦因数、助推速度、弯曲速度、芯棒伸出量和管材/芯棒间隙，而回弹角对各工艺参数的敏感性不显著。

The change law of elastic modulus for high strength 0Cr21Ni6Mn9N stainless steel tube versus plastic deformation was obtained by using the repeated loading-unloading tensile tests, and the function relationship between elastic modulus and plastic strain was established, which was embedded into software ABAQUS to simulate the influences of process parameters on springback behavior in numerical control (NC) rotary draw bending for high strength stainless steel tube. Then, the sensitivity of springback to process parameters was analyzed. The results show that the change trend of the influence of process parameters on springback behavior in NC rotary draw bending for high strength stainless steel tube is similar under the conditions of variable elastic modulus and constant elastic modulus, but only the value of springback under the condition of variable elastic modulus increases. Springback angle and radius decrease with the increasing of mandrel extension length, bending speed and push assistant speed or with the decreasing of clearance between tube and mandrel, clearance between tube and bending die and friction coefficient between tube and bending die. The springback radius is more sensitive to the process parameters, and its sensitivity sorts from the largest to the smallest is clearance between tube and bending die, friction coefficient between tube and bending die, push assistant speed, bending speed, mandrel extension length and clearance between tube and mandrel, while the sensitivity of springback angle to various process parameters is not significant.

基金项目：

江西省自然科学基金资助项目（20192BAB216022）；江西省教育厅科学技术研究项目（GJJ201126，GJJ180615）

作者简介：方军（1984-），男，博士，副教授，E-mail：fangjun020j13@163.com

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