不同钢种对全浮动芯棒钢管热连轧过程影响的模拟分析

针对不同钢种的Ф152.5mm×5.75mm规格无缝钢管8机架连轧过程进行了测试,并应用三维有限元模拟仿真技术进行了有限元建模与仿真分析。通过与实测结果对比,建立的有限元模型及其边界条件合理可靠。模拟结果表明,连轧管内壁要承受较大作用力和塑性变形,需对芯棒表面进行较好润滑;连轧管机组减壁主要发生在1~4机架上,约占总减壁量的60%以上;20钢各道次外直径和壁厚变化好于T91钢;随道次增加,钢管拉应力增大,是导致钢管内表面出现拉凹的重要原因。

Finite element simulation and analysis on dissimilar steel of seamless tube during hot continuous fully-floating mandrel rolling

In this paper,the rolling process of Ф152.5mm×5.75mm seamless tube in eight-stand fully-floating mandrel mill has been tested and simulated and analyzed by 3-dimensional FEM with dissimilar teel.The calculated results are in agreement with testing ones well.The calculation results show that the inner wall of seamless tube bears high level force and plastic deformation,so well lubrication status on mandrel surface is needed;the thickness reduction process mainly occurs in the former 4 stands,which has approximate 60% of total reduction;the outer diameter and wall thickness variation of Steel 20 are better than those of Steel T91 in each stand;the pulling stress on rolling tube increases according to the increase of stands,and this is the main reason for hollows on the tube inner surface.