无缝钢管斜轧穿孔过程分层缺陷的有限元模拟分析  

Finite element simulation analysis of delamination defects in cross rolling and piercing process of seamless steel tubes

作　　者：毛艳蕊 邱春林[1] 高秀华[1] MAO Yanrui;QIU Chunlin;GAO Xiuhua(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《轧钢》2023年第3期59-64,共6页Steel Rolling

基　　金：国家重点研发计划项目(2016YFB0300402)。

摘　　要：无缝钢管斜轧穿孔过程中容易产生分层缺陷,以某厂φ460 mm PQF机组二辊斜轧生产线为研究背景,针对该问题展开研究。利用ABAQUS软件进行三维热力耦合模拟,对典型27CrMo44S钢斜轧穿孔工艺过程中产生分层缺陷的机理进行研究,并建立了无缝钢管斜轧穿孔工艺过程模型,对钢管的应力-应变场、速度场进行了分析。结果表明:在变形过程中,管坯内表层和中间层之间的过渡层受较大的横向和轴向拉应力,产生附加拉应力和切应力,该处金属易被拉裂,产生分层的倾向性大增;管坯外表面的金属质点速度呈螺旋状,在管坯沿轧制线方向外表面中间层产生了局部金属流动增厚,导致金属流动不均而产生堆积、鼓胀现象,进而加快分层缺陷的产生。研究结果为改进生产工艺提供了理论依据。The problem of delamination defects in the cross rolling and piercing process of seamless steel tubes was studied in the context of a two-high cross rolling line ofø460 mm PQF unit for seamless steel tubes in a factory.ABAQUS software was used to perform three-dimensional thermal coupling simulation to study the mechanism of delamination defects in the cross rolling and piercing process of typical 27CrMo44S steel,a model of the cross rolling and piercing process of seamless steel tubes was established,and the stress-strain field and velocity field of the steel tubes were analyzed.The results showed that the transition layer between the inner surface layer and the middle layer of the tube billet was subjected to large transverse and axial tensile stresses,generating additional tensile and shear stresses,where the metal was prone to cracking and the tendency to delaminate greatly increased.The velocity of metal particles on the outer surface of the tube billet was spiral,causing local metal flow thickening in the middle of the outer surface along the rolling line direction of the tube billet,resulting in uneven metal flow,accumulation and bulging,thereby accelerating the generation of delamination defects.The research results provide a theoretical basis for process improvement.

关 键 词：无缝钢管 斜轧穿孔 分层缺陷 有限元模拟 27CrMo44S钢 应力场 应变场 速度场 

分 类 号：TB115[理学—数学] TG335.71[理学—应用数学]