摘要
现有的矫直、矫圆工艺均是分工独立完成的。为了在一个工序中同时完成矫直和矫圆工艺和解决大型直缝焊管成形后椭圆度和直线度的超标问题,提出一种新型的大型直缝焊管三辊连续复合矫形工艺。并以矫后管材的椭圆度、直线度和残余应力最小为设计目标,对该工艺进行过程仿真。结果表明,采用"五段式"的辊形设计并且辊轴各段的设计比例为1∶2∶4∶2∶1有更好的矫圆和矫直效果。此外,管材的椭圆度、直线度以及残余应力均与弹区比有关。当弹区比较小时,管壁截面出现失稳现象。对于同种材料,弹区比越小,管材的变形程度和矫后的残余应力越大。当弹区比分别为0.6和0.8时,均能获得良好的成形效果。矫形段辊形曲线的设计为双曲线的形式,所得到的管材直线度可以达到0.12%,椭圆度可以达到0.06%,满足大型直缝焊管的工业要求。该工艺可实现大型直缝焊管直线度和椭圆度的协同调控,从而缩短生产工艺流程,提高矫形效率。
The present straightening and rounding processes are performed individually.In order to achieve both the straightening and rounding processes simultaneously in a process and solve the problem of the ovality and straightness of LSAW pipes exceeding the standard after forming,a new three-roller continuous and synchronous adjusting straightness and roundness process on LSAW pipes is proposed.With the minimum ovality,straightness,and residual stress of LSAW pipes as the design objective,the numerical simulation of this process is carried out.The results show that the roller design scheme with"five sections"and the design ratio of the roller is 1∶2∶4∶2∶1 has better roundness and straightening effect.Besides,the ovality,straightness,and residual stress of the pipe are related to the elastic area ratio.The smaller the elastic area ratio is,the more unstable the micro-section of the pipe-wall will be.For the same material,the smaller the elastic area ratio is,the greater the deformation degree and the residual stress after deformation are.And when the elastic area ratio is 0.6 and 0.8,respectively,a good forming effect can be obtained.The roller curve of the rounding and straightening section is designed in the form of the hyperbola.The straightness of the pipe can reach 0.12%,and the ovality can reach 0.06%,meeting the industrial requirements of LSAW pipes.This process can realize the combined adjustment and control of straightness and ovality of LSAW pipes,thus shortening the production process and improving straightening and rounding efficiency.
作者
黄学颖
于高潮
翟瑞雪
马瑞
周超
高才良
赵军
HUANG Xueying;YU Gaochao;ZHAI Ruixue;MA Rui;ZHOU Chao;GAO Cailiang;ZHAO Jun(Key Laboratory of Advanced Forging&Stamping Technology and Science(Yanshan University),Qinhuangdao 066004;FSM Qinhuangdao China Co.,Ltd.,Qinhuangdao 066000)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2021年第10期148-159,共12页
Journal of Mechanical Engineering
基金
国家自然科学基金(52005431)
河北省自然科学基金(E2020203086)
国家重大科技(2018ZX04007002)资助项目。
