弯曲轴线薄壁焊管内高压成形壁厚与变形规律的研究  

Thickness and Deformation Characters of Seamed Tube Hydroforming with Twisted Axis

作　　者：谢文才 苑世剑[2] 

机构地区：[1]一汽轿车股份有限公司,长春130012 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《机械工程学报》2016年第22期78-83,共6页Journal of Mechanical Engineering

基　　金：中央高校基本科研业务费专项资金资助项目(HIT.NSRIF.2016093)

摘　　要：为了揭示焊缝对弯曲轴线类管件内高压成形的影响及缺陷产生的机制,采用试验和数值模拟的方法研究弯曲轴线焊管内高压成形的主要缺陷及壁厚分布规律,并分析焊缝在不同工序间的综合影响。结果表明,即使焊缝远离圆角区域,焊缝仍然是缺陷易发部位,弯曲使焊缝塑性下降,并导致在后续的工序中发生起皱甚至开裂。对于弯曲轴线薄壁焊管内高压成形,壁厚主要受弯曲和高压整形工序的影响,预成形工序对壁厚影响不大,而且焊缝的壁厚变化量始终小于其他区域。由此可知,焊缝是导致弯曲轴线薄壁焊管内高压成形缺陷产生的重要影响因素,将焊缝置于轻微压缩变形部位,是克服焊接接头性能下降导致的成形能力不足和避免缺陷产生的有效手段。Experiment and numerical simulation are conducted to study the deformation characters and thickness distribution during seamed tube hydroforming to disclose the effect of weld-seam on forming and the generation mechanism of defects.Meanwhile,the comprehensive effect of weld is analyzed in different processes.The results show that the weld-seam is one of the most predilection sites of bursting defects due to the weld plastic drop when bending and leads to wrinkling and bursting in the subsequent process even if the weld-seam is far away from the corner zone.The wall thickness is mainly affected by bending and hydroforming calibration processes.The preforming process has little effect on the thickness.Deformation amount of weld-seam is bigger than that of other zones for its high flow stress,as a result which induces a slight nouniformity thickness distribution.Therefore,the weld-seam is the important factors leading to defects during seamed tube hydroforming.It is helpful to minimize the effects of poor plasticity for weld-seam and prevent bursting defects by placing the weld-seam in the position of slight compressing deformation area.

关 键 词：内高压成形 焊管 焊缝 弯曲 

分 类 号：TG394[金属学及工艺—金属压力加工]