Ural Federal University named after the first President of Russia B. N. Yeltsin, Ekaterinburg, Russia:

G. V. Shimov, Cand. Eng., Associate Prof., Dept. of Metal Forming, e-mail: g.v.shimov@urfu.ru

N. I. Bushueva, Research Engineer, Scientific Laboratory of Metal Forming, e-mail: n.i.bushueva@urfu.ru

Ural Federal University named after the first President of Russia B. N. Yeltsin, Ekaterinburg, Russia¹ ; M. N. Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia²:

Yu. N. Loginov, Dr. Eng., Prof., Dept. of Metal Forming¹, Leading Researcher², e-mail: j.n.loginov@urfu.ru

The work purpose is to assess the possibility of obtaining of marketable products in the form of a thin strip from non-dimensional pipe sections. Two options for processing pipe sections into a cold strip are considered: the first option is flattening – rolling – separation, the second one is flattening – separation – rolling. The physical modeling was used in order to test the proposed schemes for the analysis, as well as process computer simulation under consideration in a finite element formulation. Computer simulation made it possible to establish deformation accumulation patterns in various areas of the strip from operation to operation and to analyze the metal destruction probability in "dangerous" zones. It is shown that the flattening stage forms large values of accumulated deformation in the future strip edges, which subsequently leads to cracking of lateral edges. In addition, accumulated metal damage in these zones leads to the need to remove them after rolling (the option 1) or immediately after flattening before rolling (the option 2). The strip obtained by both methods has a fairly uniform strain degree distribution over the cross section. Physical modeling made it possible to verify the proposed technical solutions feasibility. A strip was obtained in accordance with GOST 4986-79 with a length - 1.5 m according to both proposed options. The advantages and disadvantages of both options for processing such pipe sections are shown. Several interesting effects related to the "double strip" rolling have been established. The pipe inner surface after rolling became smooth, roughness decreased, and externally it became shiny in contrast to the outer matte surface. This effect is explained by the favorable stress state at the strip-strip boundary, which leads to strip surface smoothing. The principal possibility of introducing the considered nondimensional pipe scraps processing method to obtain marketable products without transferring the metal into the liquid phase has been established as a result of the work.
The studies were carried out as part of the implementation of the project of the Russian Science Foundation (No. 22-29-00931 dated December 20/2021).

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