TA18钛合金管材数控弯曲成形研究  

Study on CNC Bending Performance of TA18 Titanium Alloy Pipe

作　　者：李宁[1] 孙进[1] 岳常迪 陈琳 葛世伟[1] 王兆强 唐臣升[1] LI Ning;SUN Jin;YUE Changdi;CHEN Lin;GE Shiwei;WANG Zhaoqiang;TANG Chensheng(AVIC Shenyang Aircraft Industial(Group)Co.,Ltd.,Shenyang 110850,China)

机构地区：[1]中航工业沈阳飞机工业(集团)有限公司,沈阳110850

出　　处：《航空制造技术》2025年第7期107-116,共10页Aeronautical Manufacturing Technology

摘　　要：TA18钛合金导管在航空航天中有着广泛应用,大部分的钛合金导管采用数控弯曲的方式弯曲成形。本文针对TA18钛合金管材弯曲性能分析,采用单向拉伸试验与有限元仿真相结合的方法进行研究。首先对管材性能做力学性能试验得出材料性能参数,根据各类参数建立管路有限元模型,根据典型数控弯曲零件的外形要求建立相应的弯曲模具模型,对导管的数控弯曲进行仿真分析。在45°弯曲角度下,研究摩擦系数、间隙和弯曲速度等对TA18钛合金管数控绕弯成形最大截面畸变和最大外侧壁厚减薄的影响。仿真与试验结果表明,当弯曲模与管间摩擦系数增大,同时压模、防皱模与管间摩擦系数减小时,压模与管材间隙0.01 mm、弯曲速度0.15~0.5 rad/s、压模推进速度8~16 mm/s且轴向进给速度比为1.1~1.2,可显著改善成形质量,此时最大外侧壁厚减薄率和截面椭圆畸变率均达到最优值。研究验证了参数协同优化的必要性,为实际工艺参数设定提供了理论依据。TA18 titanium alloy pipes are widely used in aerospace.Most titanium alloy pipes are bent and formed using CNC bending.This article focuses on the analysis of the bending performance of TA18 titanium alloy pipes,using a method that combines uniaxial tensile testing and finite element simulation.First,the mechanical properties of the pipe were tested to obtain the material performance parameters.The finite element model of the pipeline was established based on various parameters.The corresponding bending die model was established based on the appearance requirements of typical CNC bending parts,and the CNC bending of the pipes was simulated and analyzed.At a 45°bending angle,the effects of friction coefficient,gap and bending speed on the maximum cross-sectional distortion and maximum outer wall thickness reduction of TA18 titanium alloy tube CNC bending forming were studied.Simulation and experimental results show that when the friction coefficient between the bending die and the pipe is increased while decreasing the friction coefficient between the pressure die/anti-wrinkle die and the pipe,combined with a 0.01 mm gap between the pressure die and the pipe,a bending speed of 0.15-0.5 rad/s,a pressure die feed speed of 8-16 mm/s,and an axial feed speed ratio of 1.1-1.2,the forming quality can be significantly improved.Under these conditions,both the maximum outer wall thickness reduction rate and the cross-sectional ovality distortion rate reach optimal values.The study verifies the necessity of parameters collaborative optimization and provides theoretical guidance for practical process parameters setting.

关 键 词：TA18钛合金 管材 数控弯曲 有限元仿真分析 弯曲模具 

分 类 号：TG306[金属学及工艺—金属压力加工]