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

A. P. Kolikov, Dr. Eng., Prof., Metal Forming Dept., e-mail: apkolikov@mail.ru
S. O. Ti, Student, Metal Forming Dept.

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

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 stress-strain state (SSS) of a metal during plastic forming of a sheet blank and welding of large diameter pipes (LDP) have been summarized. The results of the study of stresses (residual) and accumulated deformations over the entire technological cycle of production of welded LDP are presented. It is shown that in each operation of the process stage as a result of elastic-plastic bending of the sheet, residual stresses appear that cause a change in the geometry of the formed profi le. It has been shown that during the post-forming of the splined pipe and expansion-calibration, the residual stresses accumulated during the forming of the pipe profi le on the flanging press (FP) and JCO press are reduced, which decreases the unevenness of the SSS and, as a result, ovality, equalizes the pipe diameter along the entire length and obtaining LDP in geometric dimensions that meet regulatory requirements. The proposed mathematical models and algorithms for calculating stresses (residual) and strains make it possible to assess the uneven distribution of residual stresses and strains along the perimeter and length of the pipe and the effect of the SSS on geometric quality indicators, to determine by calculating the geometric dimensions of the pipe profi le over the entire process stage, which ensure regulatory requirements on the quality of large diameter pipes.

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