基于不同减薄量的镍钛合金管热旋压成形分析  

Deformation analysis of hot spinning of NiTi alloy tube based on different wall thickness reduction

作　　者：陆鹏 赵亚楠[2] 张艳秋[2] 江树勇[2] 李春峰[3] 

机构地区：[1]哈尔滨飞机工业集团工程技术部,黑龙江哈尔滨150060 [2]哈尔滨工程大学工程训练中心,黑龙江哈尔滨150001 [3]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2013年第1期1-7,共7页Applied Science and Technology

基　　金：国家自然科学基金资助项目(51071056)

摘　　要：为探索镍钛形状记忆合金管热旋压成形规律,采用有限元法进行了镍钛形状记忆合金管滚珠热旋压成形模拟,获得了镍钛合金管坯在不同壁厚减薄量下的温度场、应力场和应变场,并进行了旋压载荷的预测.模拟结果表明,热旋压成形时管坯及芯模和滚珠与管坯接触部位的温度都有不同程度的上升,并且随着壁厚减薄量的增加,管坯、芯模和滚珠的最高温度均呈上升趋势.管坯应力沿管坯周向差别较大,而应变则在管坯壁厚方向上变化较大,外层金属较内层金属更易发生塑性变形.随着减薄量的增加,各方向的旋压载荷均明显增大,轴向载荷远远小于径向和切向载荷.In order to investigate deformation laws of the hot ball spinning of nickel-titanium shape memory alloy （NiTi SMA） tube, the f＇mite element method （FEM） was used to simulate hot ball spinning of NiTi SMA tube. The temperature field, the stress field and strain field of NiTi pipe under different wall thickness reductions were obtained, and the spinning loads are predicted as well. The simulation results showed that the temperature of the tube, the temperatures of the mandrel and the balls in the zones where they contact with the tube all increased to a varying degree, and all of the maximum temperatures of the tube, the mandrel and the balls increased with the increase in the wall thickness reduction. There is a great difference in the stress of the tube along the circumferential direction, while there is a great difference in the strain of the tube along the thickness direction; and the outer metal is easier to deform than the inner metal of the tube. The spinning load in each direction increased obviously with the increase in the wall thickness reduction, and the load in axial direction is far less than the loads in radial direction and tangential direction.

关 键 词：镍钛合金 有限元法 滚珠旋压 热旋压 减薄量 成形分析 

分 类 号：TG306[金属学及工艺—金属压力加工]