Estimating the initial stage in the process of radial-reverse extrusion using a triangular kinematic module

Authors

DOI:

https://doi.org/10.15587/1729-4061.2022.254867

Keywords:

combined extrusion, process modeling, energy method, kinematic module, forced mode, shape formation

Abstract

Those parts of solid or hollow blanks whose shape is complex should be produced by means of combined radial-longitudinal extrusion. However, the use of combined extrusion processes with several degrees of flow freedom requires a preliminary assessment of shape formation, which is true, taking into consideration the peculiarities of evolution of strain sites at different stages of deformation.

When deforming high blanks, the presence of an intermediate rigid zone can be observed, separating two autonomous strain sites. When constructing an estimation scheme of the initial stage

of the process of combined radial-backward extrusion of hollow parts with a flange, the presence of an intermediate rigid zone is taken into consideration. The need to improve the devised estimation scheme is caused by significant deviations in the projected growths of a part from its experimentally derived dimensions. As an alternative to the axial rectangular kinematic module of the lower deformation site, the use of an axial triangular module has been proposed, whose effectiveness is demonstrated in simulating the process of radial-longitudinal extrusion with expansion. The rationality of the proposed replacement was revealed, both for forecasting the forced mode of the deformation process and for the gradual part’s shape formation. This has made it possible to reduce the projected estimates to 10 % in terms of the increase in the size of a part based on a comparative analysis with experimentally derived data. It is recommended to use the devised scheme for modeling the initial stage of the process for relatively high blanks at H0/h1>4…6; the limitation is the degeneration of the intermediate rigid zone.

This will contribute to compiling recommendations for expanding the possibilities of using combined radial-backward extrusion of hollow parts with a flange during production

Author Biographies

Natalia Hrudkina, Donbass State Engineering Academy

Doctor of Technical Sciences, Аssociate Рrofessor

Department of Mathematics and Modeling

Vladymyr Levchenko, O. Ya. Usikov Institute for Radio Physics and Electronics of the National Academy of Sciences of Ukraine

PhD, Senior Researcher

Department of Radiowave Propagation in Natural Media

Igramotdin Aliiev, Donbass State Engineering Academy

Doctor of Technical Sciences, Professor, Head of Department

Department of Metal Forming

Yurii Diachenko, Donbass State Engineering Academy

PhD

Department of Technologies and Equipment of Foundry

Roman Sivak, Vinnytsia National Agrarian University

Doctor of Technical Sciences

Department of General Technical Disciplines and Labor Protection

Liudmyla Sukhovirska, Donetsk National Medical University

PhD

Department of Fundamental Disciplines

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Published

2022-04-28

How to Cite

Hrudkina, N., Levchenko, V., Aliiev, I., Diachenko, Y., Sivak, R., & Sukhovirska, L. (2022). Estimating the initial stage in the process of radial-reverse extrusion using a triangular kinematic module. Eastern-European Journal of Enterprise Technologies, 2(7 (116), 51–59. https://doi.org/10.15587/1729-4061.2022.254867

Issue

Vol. 2 No. 7 (116) (2022): Applied mechanics

Section

Applied mechanics

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Copyright (c) 2022 Natalia Hrudkina, Vladymyr Levchenko, Igramotdin Aliiev, Yurii Diachenko, Roman Sivak, Liudmyla Sukhovirska

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