芯模填充对铜钛复合管绕弯截面畸变和壁厚减薄作用的模拟研究  

Simulation Research on Effect of Mandrel Filling on Section Distortion and Wall Thickness Reduction of Rotary-Draw Bending of Copper-Titanium Composite Tube

作　　者：朱英霞[1] 王匀[1] 万苗苗 施伟 涂文斌[1] ZHU Yingxia;WANG Yun;WAN Miaomiao;SHI Wei;TU Wenbin(School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学机械工程学院,镇江212013

出　　处：《航空制造技术》2020年第21期54-62,共9页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金(51601070);江苏省自然科学基金面上项目(BK20181447);江苏省博士后科学基金(1501099B);江苏大学高级人才科研启动基金(14JDG135)。

摘　　要：为了提高铜钛复合管绕弯成形精度,基于所建有限元模型,研究了刚性芯模参数对复合管截面畸变和壁厚减薄的影响规律,并对比了刚性芯模填充和弹性芯模填充。研究结果表明:(1)随着刚性芯棒伸出量的增大,双金属复合弯管的基、覆管截面畸变率逐渐减小,壁厚减薄率逐渐增大,最佳芯棒伸出量为7mm。(2)较之无芯模填充,采用刚性芯模填充后,截面畸变显著降低,但是壁厚减薄率增大;控制截面畸变时,一定要考虑芯模对复合管壁厚减薄率的影响,并根据实际生产要求和管材尺寸结构灵活选择填充状态。(3)弹性芯模填充时,截面畸变率沿弯曲方向的分布较之刚性芯模均匀;刚性芯模较之弹性芯模可以更好地控制复合管的截面畸变,但最大差距只有1.03%。弹性芯模较之刚性芯模可以更好地控制复合管的壁厚减薄率,最大差距为3.27%。综合考虑截面畸变和壁厚减薄,弹性芯模对双金属复合管的填充效果更好。In order to improve the precision of rotary-draw bending of copper-titanium composite tube,the effects of rigid mandrel parameters on section distortion and wall thickness thinning of the composite tube were studied,based on the established finite element model.The effects of rigid mandrel were compared with that of elastic mandrel.Research results show that:(1)with the increase of the extension amount of the rigid mandrel,the section distortion rate of the base\covered tube of the bimetallic composite tube decreases gradually,and the wall thickness reduction rate increases gradually.The optimal extension amount of the mandrel is 7mm.(2)Compared with the coreless filling,the section distortion significantly reduces with the rigid mandrel filling,but the wall thickness thinning rate increases.When controlling the section distortion,the influence of the mandrel on the thinning rate of the composite tube should be considered,and the filling condition should be selected flexibly according to the actual production requirements and the tube size and structure.(3)When the elastic mandrel is filled,the section distortion rate along the bending direction is more uniform than that of the rigid mandrel.Compared with the elastic mandrel,the rigid mandrel can control the section distortion of the composite tube better,but the maximum difference is only 1.13%.The controlling effect of wall thickness reduction rate of elastic mandrel is better than that of rigid mandrel,and the maximum difference is 3.27%.Considering the cross section distortion and the wall thickness reduction,the filling effect of the elastic mandrel on the bimetallic composite tube is better.

关 键 词：双金属复合管 塑性弯曲 芯模填充 有限元分析 

分 类 号：TG306[金属学及工艺—金属压力加工]