高强TA18钛管连续整体多弯成形精度控制  

Precision Control Strategies of High Strength TA18 Titanium Alloy Tube in Multi- bending

作　　者：李恒[1] 杨合[1] 张志勇[1] 宋飞飞[1] 李光俊[2] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072 [2]成都飞机工业(集团)有限公司,成都610092

出　　处：《精密成形工程》2014年第5期25-30,44,共7页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51275415;51175429);教育部新世纪优秀人才支持计划;高等学校学科创新引智计划(B08040)

摘　　要：目的研究获得基于多指标的高强TA18钛管整体多弯管件成形精度控制的方法。方法在获得高强TA18钛管数控弯曲非线性回弹和伸长规律的基础上,研究回弹角、回弹半径的补偿方法和伸长控制方法,其次将获得的成形精度控制方法进行多弯模拟应用验证。结果对于回弹角和回弹半径,采用先补偿回弹半径再补偿回弹角的两水平顺序控制方法;对于弯曲伸长,采用预先减少管材下料尺寸和改变弯头位置来控制回弹后直线段长度的控制方法。结论应用上述控制方法,将多弯模拟结果与预成形管件几何尺寸进行对比,获得成形角度、半径和直线段长度的最大相对误差分别为1.00%,5.51%和5.04%。上述误差满足多弯管件装配精度要求,证明所提出的成形精度控制方法是可靠的。Objective To obtain the multi- index constrained precision control strategies of high strength TA18 titanium alloy tube in multi- bending. Methods Based on the understanding of nonlinear springback and elongation characterizations of high strength TA18 titanium alloy tube in NC bending,the control strategies of springback angle,springback radius and bending elongation were firstly studied,and then the NC bending precision control strategies were verified by the multi- bending case. Results For angular and radial springback,a two level iterative springback compensation methodology was adopted. For bending elongation,a method that controls the length of straight portion by cutting the feed length in advance was proposed. Conclusion Appling these methods,the comparisons between simulated results and pre- designed tube were made. The maximum relative errors of forming angle,radius and length of straight portion were 1. 00%,5. 51%,and5. 04% respectively. These errors were lower than the tolerance required by tube subsequent assemble,which indicated that the forming precision control strategies were reliable.

关 键 词：高强钛合金管 整体多弯 成形精度 回弹角 回弹半径 伸长 

分 类 号：TG389[金属学及工艺—金属压力加工]