All-Russian Scientific and Research Institute of Tube Industry — RosNITI (Chelyabinsk, Russia):

A. V. Vydrin, Dr. Eng., Prof., Deputy General Director on Scientific Work, e-mail: vydrinav@rosniti.ru
K. Yu. Yakovleva, Cand. Eng., Scientific Researcher, Laboratory of Extrusion and Drawing, e-mail: yakovleva@rosniti.ru
A. S. Kochkin, Junior Scientific Researcher, Laboratory of Simulation of the Technological Processes, e-mail: kochkin@rosniti.ru
B. V. Barichko, Cand. Eng., Leading Scientific Researcher, Laboratory of Extrusion and Drawing, e-mail: barichko@rosniti.ru

The method of drawing in two monolithic dies installed in one production line for manufacture of cold-deformed tubes is a relatively new one and, therefore, is a little-studied process. Application of this drawing method makes it possible to considerably increase the diameter reduction of the tube and to deform the tubes with a larger total stretching in a single pass compared to conventional tube drawing, which reduces the number of operations. In this case, the process of drawing is important to conduct under conditions that ensure a stable course of deformation without breakage. The breakaway of pipes when drawing in twin dies is influenced by various factors, such as the distance between the dies, distribution of deformation along the deformation area, the friction coefficient at the contact between the tube and working tool, and others. The object of research and analysis is the technological process of manufacturing cold-deformed tubes from various steel grades. The work is devoted to the analysis of the influence of the distribution of strain on the dies on the stressed state, the drawing force, the safety factor, the conditions of the anti-tension. All these factors must be taken into account in the development of rational routes for drawing of tubes in twin dies. Technological features of manufacturing of tubes by drawing in twin dies are considered in the article, the basic advantages of the given method are considered. The optimal parameters of the stable course of the drawing process are determined and scientifically substantiated on the basis of computer modeling with the use of specialized software products.

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