Transactions of Materials and Heat Treatment

Title：Influence of clearance between pipe and die on CNC bending quality for Ti-2Al-2.5Zr titanium alloy pipe

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ClassificationCode：TG386

year,vol(issue):pagenumber：2024,49(1):81-88

Abstract：

A finite element model of the CNC bending process for Ti-2Al-2.5Zr (TA16) titanium alloy pipe was established, and the effectiveness of the finite element model was verified by experiments. Then, based on the established model, the influence laws of clearance between pipe and die on the cross-section distortion rate and pipe wall thickness changes during the CNC bending process were studied, and the optimal clearance value between pipe and die was obtained by the entropy method. The results show that decreasing the clearance between pipe and bending die and the clearance between pipe and pressing block and increasing the clearance between pipe and anti-wrinkle block can reduce the thinning rate of outer wall. With the increasing of the clearance between pipe and mandrel, the thinning rate of outer wall first decreases and then increases. Increasing the clearance between pipe and bending die and decreasing the clearance between pipe and mandrel can reduce the thickness rate of inner wall, and decreasing the clearance between pipe and bending die and the clearance between pipe and mandrel can effectively reduce the cross-section distortion rate. Changing the clearance between pipe and press block and the clearance between pipe and anti-wrinkle block has no obvious effect on the thickening rate of inner wall and the cross-section distortion rate. Through the entropy method, the optimal clearance between pipe and bending die is 0.10 mm, the clearance between pipe and mandrel is 0.10 mm, the clearance between pipe and press block is 0.05 mm, and the clearance between pipe and anti-wrinkle block is 0.15 mm.

Funds：

江苏省重点研发计划资助项目（BE2019007-3）；江苏省研究生科研与实践创新计划（KYCX23_1437）

作者简介：王金明（1999-），男，硕士研究生 E-mail：1512036775@qq.com 通信作者：王华（1978-），男，博士，教授 E-mail：wanghua@njtech.edu.cn

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