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METAL PROCESSING
ArticleName Stress-strain state of copper bar during the rolling process implemented in box groove
DOI 10.17580/tsm.2015.11.13
ArticleAuthor Loginov Yu. N., A Postylyakov. Yu., Inatovich Yu. V.
ArticleAuthorData

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

Yu. N. Loginov, Professor, e-mail: j.n.loginov@urfu.ru
A. Yu. Postylyakov, Post-Graduate Student
Yu. V. Inatovich, Assistant Professor

Abstract

The process of copper bar rolling in a box groove is the object of the study. Strain scheme corresponds to the production process CONTIROD. Evaluation of the stress-strain state used the finite elements method, implemented in a software module DEFORM-3D. Distribution of the strain degree, standard pressure, middle and longitudinal stresses was obtained, and heterogeneity of these parameters is shown over the size of the deformable metal. Zones of increased strain degree are located on the edge of the bar and are extended deep into it in the form of the forging cross. Diagrams of distribution of medium and longitudinal stress on the trajectory of the points, located on the bar side, are drawn. Compressive stress is observed in the non-contact zone before the entry of the rolling. Stress is replaced by the pulling inside the strain center. After the rolling process, stress becomes compressive again in the non-contact zone. The bar pressing process starts on the edges and extends toward the center. The metal zones, placed closer to the edges, are under the bigger strain in strain center on the side. The area of the potentially dangerous pulling stress was defined in the central part of the side surface of the bar. The practical significance of the calculations is to determine the billet areas, where the metal destruction is possible. It is necessary to use the strain scheme during the profiled rolling, characterized by low level of pulling stress, since the copper billet rolling practice shows the possibility of occurrence of cracks on the side.

keywords Electrotechnical copper, flat-and-edge rolling, box groove, stress, strain, finite elements method, compression, pull
References

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