锻压技术

带波纹薄壁不锈钢管的弯曲成形工艺

英文标题：Bending process of thin-walled stainless steel tube with corrugated section

分类号：TG306

出版年,卷(期):页码：2020,45(6):71-79

摘要：

为深入分析带有波纹段的薄壁不锈钢管的弯曲成形工艺，基于ABAQUS/Explicit和ABAQUS/Standard建立了包含弯曲、抽芯、回弹在内的绕弯成形过程的有限元模型，并与实验相结合，研究了助推速度以及弯曲角度对成形质量的影响。此外，还进一步研究了不同弯曲角度下的回弹规律，建立了回弹补偿公式，同时进行了实验验证。结果表明：助推速度对弯曲段的壁厚分布及截面畸变率影响微弱，但对波纹段有显著影响，当助推速度等于中性层线速度V0时，波纹段长度、波纹间距和波纹位移变化最小；弯曲角度大于60°后，内、外侧增厚率或减薄率出现“平台”现象，壁厚分布更加均匀；回弹量与弯曲角度大致呈线性关系，同时，实验证明所建立的回弹补偿公式能够准确地应用于带波纹薄壁不锈钢管的弯曲成形过程。

In order to further analyze the bending process of thin-walled stainless steel tube with corrugated section, the finite element model of stretch bending process including bending, extraction mandrel and springback was established by ABAQUS/Explicit and ABAQUS/Standard, and the influences of push speed and bending angle on the forming quality were studied by the combination of FE simulation and experiment. Moreover, the law of springback was investigated under different bending angles, and the springback compensation function was established and verified by experiment. The results show that push speed has no obviously effect on thickness distribution and section distortion ratio of bending section, on the contrary, has great effect on the corrugated section. Furthermore, the corrugated section length, the corrugation spacing and the corrugation displacement change the least when the push speed equals to the neutral layer linear velocity of V0. And the thickening or thinning ratio inside and outside of tube appear a ‘platform’ phenomenon and the wall thickness distribution is more uniform when the bending angle is greater than 60°. Meanwhile, the relationship between springback amount and bending angle is a linear function, and the springback compensation function proved by experiment is applied on the bending process of thin-walled stainless steel tube with corrugated section accurately.

基金项目：

国家自然科学基金资助项目（51875548）；江苏省重点研发项目（BE2016156）

徐勇（1983-），男，博士，副研究员 E-mail：yxu@imr.ac.cn 通讯作者：张士宏（1962-），男，博士，研究员 E-mail：shzhang@imr.ac.cn

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