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Rolling and other Metal forming processes
ArticleName Modeling of the stress-strain state of a metal during plastic forming of a sheet blank and welding of large diameter pipes. Report 1
ArticleAuthor A. P. Kolikov, D. Yu. Zvonarev, M. I. Taupek

National University of Science and Technology “MISiS” (Moscow, Russia):

A. P. Kolikov, Dr. Eng., Prof., Metal Forming Dept., e-mail:


All-Russian Scientific and Research Institute of Tube Industry — RosNITI (Chelyabinsk, Russia):
D. Yu. Zvonarev, Cand. Eng., Head of Helical Rolling Lab., e-mail:


Moscow Polytechnic University (Elektrostal, Russia):
I. M. Taupek, Cand. Eng., Associate Prof., Head of Metal Forming Dept. in Elektrostal affiliate


The results of physical and mathematical modeling of the stressstrain state of a metal during plastic shaping of a sheet blank and welding of large diameter pipes have been summarized and the results of studies of stresses (residual) and accumulated strains during step forming in press equipment according to the JCO scheme have been presented. It was shown that residual tensile stresses, whose distribution is extremely uneven, appear in each operation of the technological stage as a result of elastic-plastic bending of the sheet, which leads to an uneven distribution of the geometric parameters of the formed profile. Mathematical models allow to use a package of computer programs to select rational parameters for forming a pipe profi le taking into account residual stresses and deformations and to obtain a workpiece with side set edges (splined tube assembly) of the required geometric dimensions for subsequent tech nological operations: shaping, welding and calibration of large diameter pipes (LDP) ) The proposed mathematical models for calculating residual stresses are recommended for use in evaluating the geometric dimensions of a welded pipe.

keywords Мathematical models, sheet blank forming, large diameter pipes, press tools, assembly and welding mill, pipe expansion

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