摘要
为解决薄壁气瓶管壁厚精度不高,管体拉凹/孔洞和纵向内伤较多的问题,通过有限元模拟分析了孔型优化前后孔型参数对截面的各道次出口壁厚分布、轧制应力应变分布及各点金属流动速差的影响,据此优化了孔型高、偏心距、槽底半径、连接半径、连接角、辊缝等尺寸的孔型参数组。有限元分析结果表明,孔型优化后金属不均匀变形得到改善,最大等效应力减小。经应用在薄壁气瓶管生产后,轧辊磨损更加均匀,钢管壁厚精度得到提高,拉凹/孔洞缺陷比例从1.1‰降至0.21‰,纵向内伤缺陷比例从12%降至3.12%。
In order to solve the problems of low wall thickness accuracy,high rates of pipe body pulled concave,hole and longitudinal internal damage of the light-wall gas vessel-service steel pipe,the FE simulation method is used to analyze the influence of pass parameters before and after the optimization on distribution of outlet wall thickness distribution of each pass of the section,the distributions of rolling stress and strain,and metal flow velocity of each point.Accordingly the pass parameters are optimized,including the height,the eccentricity,the groove radius,the connecting angle,and the roll gas,etc.The FEA results show that due to the above mentioned said optimization,the uneven metal deformation is improved,and the maximum equivalent stress reduce.Thanks to application of the said optimized design to the actual production of the light-wall gas vessel-service pipe,the roll wear becomes more uniform,the pipe wall thickness accuracy is improved,and the rate of the pulled-concave and hole defects reduced from 1.1‰down to 0.21‰,and the that of the longitudinal inner damage defect from 12%down to 3.12%.
作者
朱智禄
刘建群
刘志伟
王燕飞
ZHU Zhilu;LIU Jianqun;LIU Zhiwei;WANG Yanfei(Hengyang Valin Steel Tube Co.,Ltd.,Hengyang 421001,China)
出处
《钢管》
2025年第1期33-39,共7页
Steel Pipe
关键词
PQF连轧管机组
孔型
拉凹
壁厚精度
有限元模拟
PQF mandrel pipe mill
pass
pulled concave
wall thickness accuracy
FE simulation
