锻压技术

高强钢方管绕弯时截面参数对成形质量的影响

英文标题：Influences of crosssection parameters on forming quality for high strength steel square tube in rotary draw bending

作者：牛卫中汪倩

单位：兰州交通大学

关键词：高强钢薄壁方管绕弯成形截面参数有限元模拟

分类号：TG386.43

出版年,卷(期):页码：2018,43(10):84-90

摘要：

金属薄壁方管在绕弯加工中一般会产生横截面畸变、顶板减薄、底板起皱等成形缺陷。为了判断高强钢方管截面参数对弯管成形质量的影响程度，建立了方管绕弯成形的三维有限元模型，在截面边长与弯曲半径一定时，基于Dynaform软件对6种尺寸的JAC590Y方管的90°绕弯成形分别进行了模拟，得出了不同相对壁厚与相对圆角半径方管绕弯后的主要畸变参数。分析表明：高强钢方管经90°绕弯后，其横截面畸变最大的部位出现于弯管的前段，其截面角处于50°~90°之间；在方管的截面边长、弯曲半径及管坯与模具的间隙一定时，方管的相对圆角半径与相对壁厚越小，则管件的横截面畸变与最大壁厚减薄率便会越大，而管件底板也越容易沿纵向起皱或其皱曲越明显。

In the rotary draw bending of thinwalled metallic square tube, distortion of crosssection, thinning of roof plate and wrinkling of bottom plate are common forming defects. In order to judge the influences of crosssection parameters of high strength steel square tube on the forming quality of bent tube, a threedimensional finite element model of square tube in rotary draw bending was built. When the crosssection side length and bending radius remained unchanged, the processes of 90° rotary draw bending under six sizes of JAC590Y square tubes were respectively simulated by the software Dynaform, and the major distortion parameters of bent square tubes with different sectional relative wallthickness and relative fillet radius were obtained. The analyses show that after high strength steel square tubes are bent to 90°, their maximum crosssection distortion appears in the front length of bent tubes with crosssection angle between 50° and 90°. When the crosssection side length and bending radius of square tube as well as the clearance between tube blank and die are fixed, the smaller the relative fillet radius and relative wallthickness of square tube are, the larger the crosssection distortion and the maximum wallthickness thinning rate of bent tube are, and the more easily its bottom plate wrinkles in the longitudinal direction, or the more obvious the wrinkling appears.

基金项目：

甘肃省高等学校研究生导师科研项目(1004-04)

牛卫中（1962-），男，硕士，教授，E-mail：nwz@mail.lzjtu.cn；通讯作者：汪倩（1991-），女，硕士研究生，E-mail：2580950967@qq.com

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