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

V. N. Shinkin, Dr. Sci. (Phys.-Math.), Prof., e-mail: shinkin-korolev@yandex.ru

In the modern production of the large-diameter thick-walled steel welded pipes on the presses, the main part of the steel pipe’ billet (about 90% of the billet’s surface) is deformed on the O-forming press by means of the movable punch and the fixed matrices. However, it is impossible to make the bending of the sheet’s longitudinal edges on this press. Therefore, before the forming of the billet on the O-forming press, the edges of the steel sheet billet are always bent on the flanging press. The low-quality calibration of the instrument of the flanging press and the wrong choice of the technological modes of the bending of the billet’s edges lead to the formation of the numerous defects of the sheet billet (the corrugation defect of the billet’s edges, the offset edges of the billet, and so on) that makes it impossible in the next for a good quality weld of the pipe billet’s edges on the pipe-welding machine. Under the edge’s transversal bending of the thick-leaved blank the analytical method of the calculation of the main technological parameters is suggested in this paper. The shape and size of the thick-leaved blank during and after the forming in the flanging press, the spring coefficient and the residual curvature of the blank are obtained. During every molding stage the elasto-plastic material model is considered. The condition of the corrugation’s origin for the longitudinal edge of the sheet blank is obtained. The results of the investigation are important for the working out of the manufacturing technique of the steel major-diameter tubes for the main pipelines.

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