Moscow Polytechnic University (Moscow Polytech), Moscow, Russia

A. V. Fomin, Candidate of Technical Sciences, Associate Professor, e-mail: fominmisis84@mail.ru

National University of Science and Technology MISIS, Moscow, Russia
S. P. Galkin, Doctor of Technical Sciences, Professor, e-mail: glk-omd@yandex.ru
A. S. Aleshchenko, Candidate of Technical Sciences, Associate Professor, e-mail: judger85@mail.ru
Yu. V. Gamin, Candidate of Technical Sciences, Associate Professor, e-mail: gamin910@gmail.com
V. P. Romanenko, Candidate of Technical Sciences, Professor, e-mail: romanenko-misis@yandex.ru

The present paper sets forth the findings of an experimental study conducted to investigate the effects of altering the radially oriented macrostructure of initial castings, thereby transforming it into a spiral-type macrostructure. This transformation is achieved by the application of shear displacements of metal during the deformation process through the utilisation of helical rolling, utilising various combinations of feed angle β and drawing coefficient μ (β = 12°/μ = 2.2, β = 14°/μ = 2.5, β = 16°/μ = 2.3, β = 18°/μ = 2.3, β = 20°/μ = 2.3). For the first time in the world practice with the use of experimental-industrial equipment (radial shear rolling mill MISIS 100T) experimentally revealed the influence of feed angle β on the character of metal flow, reflecting the change of spiral structure in the cross section, shear line lγ, shear angle γ: with increasing feed angle β the length of structural fibre lγ decreases by ≈1.5 times (at β = 120 the length l_γ = 28.48 mm, and at β = 200 the length l_γ = 19.01mm), the shear angle γc near the axis of the workpiece decreases by 9.8 times (at β = 120 γ_c = 26.40, and at β = 200 γ_c = 2.70). The studies undertaken demonstrate the efficacy of the radial shear rolling method in regulating metal flow within the deformation centre. The findings of the present study are instrumental in extending the theoretical framework of helical rolling and in the development of a methodological framework for analytical calculations in metal forming along specified trajectories, thereby facilitating the control of material properties that are sensitive to structure.

This work was financially supported by the Moscow Polytechnic University within the framework of the grant named after Pyotr Kapitsa.

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