热扩孔TP304不锈钢管坯变形行为及载荷分析  

Deformation behavior and load analysis of TP304 stainless steel billet during hot expansion process

作　　者：拓雷锋[1] 李宝亮 李强 李树伟 周根树[3] 桂海莲[1] 楚志兵[1] TUO Lei-feng;LI Bao-liang;LI Qiang;LI Shu-wei;ZHOU Gen-shu;GUI Hai-lian;CHU Zhi-bing(College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Stainless Steel Tube Branch Company,Taiyuan Iron&Steel(Group)Co.,Ltd.,Taiyuan 030008,China;State Key Laboratory for Mechanical Behavior of Materials,Xi′an Jiaotong University,Xi′an 710049,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]山西太钢不锈钢钢管有限公司,山西太原030008 [3]西安交通大学、金属材料强度国家重点实验室,陕西西安710049

出　　处：《塑性工程学报》2023年第4期70-79,共10页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52175353);太原科技大学博士启动基金资助项目(20212020)。

摘　　要：对60 MN挤压生产线TP304不锈钢大直径管坯的扩孔变形工艺进行了研究,采用数值模拟方法分析了不同工况下的扩孔变形行为,研究了不同工艺参数对扩孔变形的影响。模拟结果表明,增大喇叭口直径有利于改善扩孔后管坯上端面的平直度,但对扩孔载荷影响不大,增大管坯内孔直径有利于扩孔余料的分离和降低扩孔载荷。直径为Φ270 mm的喇叭口和直径为Φ80 mm的内孔可顺利实现Φ432 mm管坯的扩孔工艺。管坯和扩孔筒中心不对中会直接造成扩孔后管坯上端面倾斜,提高扩孔温度和降低扩孔速度有利于降低变形抗力和应变速率,对降低扩孔载荷有利。基于模拟结果,采用工艺试验进行了管坯形状和工艺参数优化的可靠性验证。The expansion deformation process of TP304 stainless steel large diameter billet in 60 MN extrusion production line was studied.The numerical simulation method was used to analyze the expansion deformation behavior under different working conditions,and the effects of different process parameters on expansion deformation were studied.The simulation results show that increasing the bell mouth diameter is beneficial to improve the flatness of the upper end face of billet after expansion but has little effect on the expansion load.Increasing the inner hole diameter of billet is beneficial to separate the expansion surplus metal and reduce the expansion load.The bell mouth with diameter ofΦ270 mm and the inner hole with diameter ofΦ80 mm can achieve the expansion process of billet with diameter ofΦ432 mm successfully.The center misalignment between the billet and the expansion cylinder can cause the inclination of the upper end face of billet after expansion directly.Increasing the expansion temperature and reducing the expansion speed are beneficial to reduce the deformation resistance and strain rate,which is beneficial to reduce the expansion load.Based on the simulation results,the reliability of billet shape and process parameter optimization was verified by process tests.

关 键 词：不锈钢 热扩孔 变形行为 载荷 

分 类 号：TG379[金属学及工艺—金属压力加工]