管坯参数对金属薄壁“目”字形截面管绕弯截面畸变的影响  

Influences of tube blank parameters on section distortion for metallic thin-walled tube with“目”-shaped section in rotary draw bending

作　　者：王小卓 牛卫中[1] Wang Xiaozhuo;Niu Weizhong(School of Mechanical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学机电工程学院,甘肃兰州730070

出　　处：《锻压技术》2024年第11期30-36,共7页Forging & Stamping Technology

摘　　要：为了研究管坯材料与尺寸参数对金属薄壁“目”字形截面管绕弯后截面畸变的影响,利用有限元分析软件ABAQUS对6组19种管坯的绕弯过程分别进行了仿真,得出了这些弯管截面畸变的一般形式与每种弯管3个尺寸缩减率的最大值。结果表明:“目”字形截面管坯绕弯后其截面通常会变为梯形;弯管壁厚缩减率的最大值在大多数情况下均高于顶宽缩减率的最大值与截面高度缩减率的最大值;选用屈强比较小的管材、截面高度较小的管坯有助于减小弯管的截面畸变和壁厚减薄;以设计合理的“目”字形截面管坯取代矩形或“日”字形截面管坯可以明显抑制弯管的截面畸变,但难以对其顶板壁厚的减薄做出改善。In order to study the influences of material and size parameters of tube blank on the section distortion of metallic thin-walled tube with"目"-shaped section in rotary draw bending,the rotary draw bending process of six groups and nineteen types of tube blanks were respectively simulated by finite element analytical software ABAQUS,and the general pattern of section distortion for these bent tubes and the maximum reduction rate of three sizes for each bent tube were obtained.The results show that after rotary draw bending,the section of tube blank with"目"-shaped section usually becomes trapezoid,and the maximum value of wall-thickness reduction rate for bent tube is generally higher than that of top-width reduction rate and section-height reduction rate.Choosing the tube material with smaller yieldstrength ratio or the tube blank with smaller section height help to reduce section distortion and wall-thickness thinning of bent tube,and taking the well-designed tube blank with"目"-shaped section to replace the rectangular the section or"日"-shaped section can significantly suppress the section distortion of bent tubes,but it is difficult to improve the thinning of the wall thickness for top plate.

关 键 词：“目”字形截面管 绕弯成形 管坯 截面畸变 壁厚减薄 

分 类 号：TG386.43[金属学及工艺—金属压力加工]