Cu/304双金属管拉拔成形有限元模拟及结合性能分析  

Finite element simulation and bonding performance analysis of Cu/304 bimetallic tube drawing forming

作　　者：杨西荣[1] 权强强 杨博海 罗雷[1] 刘晓燕[1] 王敬忠[1] YANG Xi-rong;QUAN Qiang-qiang;YANG Bo-hai;LUO Lei;LIU Xiao-yan;WANG Jing-zhong(College of Metallurgical Engineering,Xi′an University of Architecture&Technology,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《塑性工程学报》2022年第7期74-81,共8页Journal of Plasticity Engineering

基　　金：陕西省医用金属材料重点实验室开放基金(SXBMM-201903)。

摘　　要：采用拉拔技术制备了Cu/304双金属管。通过对Cu/304双金属管拉拔成形过程进行有限元模拟,分析了成形过程中基管和衬管的受力以及变形规律,在此基础上利用正交试验确定了拉拔成形双金属管的最优工艺参数,并通过极差分析确定了各个影响因素对试验结果的显著性。采用光学显微镜和X射线衍射仪对结合界面进行了表征。结果表明:基管和衬管均为轴向为拉应力、径向和周向为压应力,在成形过程中基管相当于衬拉,衬管相当于空拉;等效应力从基管外表面到界面处稳定不变,在界面处突然增大,由界面到衬管内表面逐渐增大。应变主要发生在基管层,轴向为延伸、径向和周向为压缩,衬管几乎没有发生变形。利用正交试验最优工艺方案经过2个道次拉拔试验制备了Cu/304双金属管,第1道次结合界面平整光滑无缝隙,第2道次出现了微形不平整结构;结合界面处残余接触应力第1道次径向应力为(81.5±22.7)MPa;第2道次径向应力为(220±10.7)MPa。The Cu/304 bimetallic tube was prepared by drawing technology. The force and deformation laws of base tube and liner tube during the forming process were analyzed through finite element simulation for drawng forming process for Cu/304 bimetallic tube. On this basis, the optimal process parameters of drawing forming of bimetallic tube were determined by orthogonal test, and the significance of each influence factor on the test results was determined by the range analysis. The optical microscope(OM) and X-ray diffract meter(XRD) were used to characterize the bonding interface. The results show that both the base tube and liner tube are under tensile stress in axial direction, and compressive stress in radial and circumferential direction. During the forming process, the base tube is equivalent to the plug drawing, and the liner tube is equivalent to the empty drawing. The effective stress is stable from the outer surface of the base tube to the bonding interface, and it increases suddenly at the bonding interface, and it increases gradually from the bonding interface to the inner surface of liner tube.The strain mainly occurs in the base tube layer, which is extended in axial direction, and compressed in radial and circumferential direction, and the liner tube is almost free of deformation. The Cu/304 bimetallic tube was prepared through two-pass drawing tests using the optimal scheme parameters obtained by orthogonal test. The bonding interface is smooth and seamless in the first pass, and the micro-shaped uneven structure appears in the second pass;the residual stress of the first pass at the bonding interface is(81.5±22.7) MPa and the radial stress of the second pass is(220±10.7) MPa.

关 键 词：拉拔成形 双金属管 有限元模拟 正交试验 

分 类 号：TG146[一般工业技术—材料科学与工程]