摘要
Abstract
The mechanical end expanding process of the longitudinal submerged-arc welded pipe was studied by means of FEM simulation technology in this paper. The pipe end de-formation on both cross section and lengthwise section was also analyzed. Results showed that the deformation could be divided into end deformation zone, transition zone and non-deformation zone in axial direction of the pipe, and a reasonable length of end expanding need to be determined before the expanding process. Pipe thickness in the end deformation zone became thinner and the maximal strain took place in the section where the pipe and die fillet were in tangency. In the section between the two adjacent dies, wall thickness of billet was uneven, tangential tensile stress came up to the maximum and wall thickness reduced se-riously. Damage prevention in these locations was necessary. There was an evident feature of local deformation in the pipe end expanding process. Through the simulation of the me-chanical end expanding process of the longitudinal submerged-arc welded pipe, some useful conclusions had been obtained, such as appropriate expanding length and the wall thickness changes of the pipe end, which were beneficial to actual production.关键词
直缝埋弧焊管/端口扩径/变形特征/有限元模拟Key words
longitudinal submerged-arc welded pipe/pipe end expanding, deformation fea-ture/finite element simulation分类
信息技术与安全科学
