JSC Pervouralsk New Pipe Plant (Pervouralsk, Russia):

V. A. Toporov, Managing Director, e-mail: ToporovVA@stw.ru

JSC Seversky Pipe Plant (Polevskoy, Russia):
O. A. Panasenko, Head of the pipe-rolling laboratory of the research center, e-mail: PanasenkoOA@stw.ru

Ural Federal University named after the first President of Russia B. N. Yeltsin, (Ekaterinburg, Russia):
A. O. Khalezov, Master’s student, Dept. of Metal Forming, e-mail: alekssanja633@mail.ru
D. Sh. Nukhov, Cand. Eng., Associate Prof., Dept. of Metal Forming, e-mail: d.s.nukhov@urfu.ru

Every year, the requirements for dimensional accuracy, ovality and curvature, and the absence of internal and external defects are tightened for hot-rolled seamless pipes. Current research is aimed at improving the process of continuous rolling of pipes in order to justify rational tool calibrations, rolling speed modes, increasing tool durability and improving the quality of hot-formed seamless pipes. The modern approach to solving problems of metal forming is the use of the finite element method. A significant advantage of the finite element (FE) modeling method is the possibility of modeling deformation non-stationary processes. In contrast to analytical methods, the KE modeling method makes it possible to build more advanced mathematical models, including volumetric ones, based on a much smaller number of assumptions and constraints. Therefore, the research results obtained with its help can be considered more objective. The task of computer simulation of the process of continuous rolling of pipes on the FQM mill with the extraction mill in the program of finite element modeling DEFORM-3D was set. The model was verified by comparing the process parameters obtained from the results of numerical simulation with the corresponding values obtained in the conditions of industrial production. It is established that the development of technical solutions for minimizing defects can be carried out by solving the problems of CE-modeling of the process. The temperature and strain fields, critical areas of metal damage for the basic model are determined. The following reasons were noted as the causes of the defect: unsynchronization of the speeds of the FQM continuous mill and the extraction mill, insufficient time to hold the mandrel in its extreme position (return of the mandrel before removing the pipe billet from it), as well as the deviation of the rolling axes of the continuous mill and the extraction mill due to poor retention of the mandrel by gabiets (support rollers) between the stands.

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