锻压技术

管材斜连轧过程应力分析及实验研究

英文标题：Stress analysis and experiment study on tandem skew rolling process of tube

作者：毛飞龙王小亮双远华梁建国王付杰

分类号：TG335.71

出版年,卷(期):页码：2022,47(5):128-134

摘要：

为了分析斜连轧过程处于中间段管材的应力情况，采用理论分析的方法，建立了穿孔段出口处、轧管段入口处管材的速度公式，分析了不同速度匹配下的3类共8种速度关系，以及8种速度关系下处于中间段的管材的受力情况。采用变量分析法，设置了3组实验参数进行对比实验。结果表明：当穿孔段工艺参数不变，实验组2中轧管段轧辊转速为174 r·min-1、送进角为9°时，轧管段入口处管材的轴向、切向速度分量均大于穿孔段出口处管材的轴向、切向速度分量，速度变化率约为3%，处于中间段的管材受到轴向拉应力及与管材旋转方向相同的切应力共同作用，实现微张力轧制而顺利获得荒管，轧后管材外径平均值为Φ39.16 mm，壁厚平均值为4.65 mm。同时，从管材受力角度对比分析了实验组1和3出现轧卡的内在原因为应力状态不利于管材金属流动。

In order to analyze the stress condition of the tube in the middle section during the tandem skew rolling (TSR) process, the velocity formulas of tube at exit of piercing section and at the entrance of rolling section were established by the theoretical analysis method, and the eight different velocity relations for three kinds of conditions were analyzed under different velocity matching. Then, the stress conditions of the tube in the middle section under eight velocity relations were also analyzed, and the experiments with three groups of experimental parameters were investigated by using variable analysis method. The results show that when the process parameters in piercing section keep constant,and the roll rotation speed and feeding angle of the rolling section in experiment group 2 are 174 r·min-1 and 9° respectively, the axial and tangential velocity components of tube at the entrance of rolling section are larger than those at the exit of piercing section, and the change rate of velocity is about 3%. In this case, the tube in the middle section is subjected to the combined action of axial tensile stress and shear stress in the same direction as the tube rotation to realize the micro-tension rolling and obtain the rolled tube smoothly, and the average values of outer diameter and wall thickness for the rolled tube are Φ39.16 mm and 4.65 mm respectively. In the meantime, by contrastive analysis from the perspective of stress on tube, the underlying reason of the rolled jamming in experiment groups 1 and 3 is that the stress state of tube is not conducive to metal flow.

基金项目：

优秀博士来晋科研专项（QZX-2019009）；山西省“1331工程”产业信息化改造提升协同创新中心建设项目；国家自然科学基金资助项目（52075361）；山西省科技重大专项项目（20201102003）；博士科研启动项目（YQ-2019006）

作者简介：毛飞龙(1987-)，男，博士，讲师，E-mail：maofeilong@163.com

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