Transactions of Materials and Heat Treatment

Title：Stress analysis and experiment study on tandem skew rolling process of tube

Authors： Mao Feilong Wang Xiaoliang Shuang Yuanhua Liang Jianguo Wang Fujie

Unit： Yuncheng University Taiyuan University of Science and Technology Taiyuan University of Technology

KeyWords： seamless steel tube tandem skew rolling stress analysis velocity coordination metal flow

ClassificationCode：TG335.71

year,vol(issue):pagenumber：2022,47(5):128-134

Abstract：

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.

Funds：

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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