1. Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling， Anhui University of Technology， Ma′anshan 243002， Anhui， China; 2. School of Metallurgy Engineering， Anhui University of Technology， Ma′anshan 243002， Anhui， China;3. Technology Center， Jiangsu Changbao Plesson Seamless Steel Tube Co.， Ltd.， Changzhou 213200， Jiangsu， China
Abstract：Abstract：In order to solve tube wall pulled concave problem in the actual production of thinwalled seamless steel tube rolled by CPE push bench mill, the push bench process of 42CrMo4 steel tubes with typical specification of 111mm×4,35mm was numerically simulated by using 3D finite element analysis software Simufact, based on the equipment and technological conditions of the 114mm CPE push bench mill of a steel tube company. The rolling force, the outlet wall thickness of rolled tube at each stand, stress/strain and relative sliding velocity between the inner surface of the workpiece and the mandrel in the push bench process were analyzed. The results show that there has a tension between stands with larger wall reduction, and the greater the wall reduction of the stand, the greater the reduction of the wall thickness of rolled tube at the roll gap. The axial stress of the rolled tube at the roll gap is tensile stress, and the axial tensile stress on the rolled tube is larger within a distance close to the head of the rolled piece; the tendency of wall thickness pulled concave increases. The main causes of the tube wall pulled concave are the serious inhomogeneous deformation of the workpiece along the width of the pass caused by the excessive wall reduction and the reduction rate, the larger tension between the stands and the mandrel pulling force produced by the excessive velocity difference between the mandrel and the workpiece.
尹元德，杨青青，王纯凯，汪龙，李修叶. 薄壁无缝钢管顶管过程拉凹缺陷研究[J]. 钢铁研究学报, 2019, 31(5): 460-467.
YIN Yuande, YANG Qingqing, WANG Chunkai, WANG Long, LI Xiuye. Study on defect of pulled concave in push bench process of thinwalled seamless steel tubes. JOURNAL OF IRON AND STEEL RESEARCH , 2019, 31(5): 460-467.
2019, Vol. 31 
