Predicting the shape formation of parts with a flange and an axial protrusion in the process of combined aligned radial-direct extrusion

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.212018

Keywords:

simulation of combined extrusion processes, kinematic module, energy method, semi-finished product shape formation

Abstract

Using the calculation schemes CS-1 (with the presence of a trapezoid module) and CS-1a (with rectangular kinematic modules) has been proposed for the process of the combined radial-direct extrusion of parts with a flange and an axial protrusion. The application of a trapezoidal kinematic module allows the description of the characteristic regions of metal flow, close to the actual course of the process based on the distorted coordinate grids. On the basis of the energy method, the values of the reduced deformation pressure have been obtained using the upper estimate of the power of deformation forces inside the trapezoidal kinematic module. The optimization involved the parameter Rk that determines the position of the surface of the interface of metal flow into an axial protrusion and a flange zone. We have performed a comparative analysis of the theoretical calculations of the magnitude of the reduced deformation pressure and the influence of geometric ratios and friction conditions on the qualitative and quantitative differences in the character of the change in the resulting curves. The overestimation of data on assessing the force mode based on the CS-1a scheme relative to the calculations based on the CS-1 scheme can be as high as 50 % and indicates the rationality of using the latter. This is due to the limitation in the use of the optimization (the absence of the optimization of the height of the deformation site) for the scheme containing elementary rectangular kinematic modules. The deviation from the experimentally obtained increments in an axial protrusion does not exceed 7‒10 %, which indicates the validity of the use of the CS-1 estimation scheme with a trapezoidal kinematic module. Thus, it can be argued that it is correct to determine the position of the boundary of the surface of the interface of metal flow into an axial protrusion and a flange zone and the resulting assessment of the formation of a semi-finished product

Author Biographies

Natalia Hrudkina, Donbass State Engineering Academy Akademichna str., 72, Kramatorsk, Ukraine, 84313

PhD

Department of Metal Forming

Leila Aliieva, Donbass State Engineering Academy Akademichna str., 72, Kramatorsk, Ukraine, 84313

Doctor of Technical Sciences, Associate Professor

Department of Metal Forming

Oleg Markov, Donbass State Engineering Academy Akademichna str., 72, Kramatorsk, Ukraine, 84313

Doctor of Technical Sciences, Professor, Head of Department

Department of Computerized Design and Modeling of Processes and Machines

Khrystyna Malii, Donbass State Engineering Academy Akademichna str., 72, Kramatorsk, Ukraine, 84313

PhD, Senior Lecturer

Department of Metal Forming

Liudmyla Sukhovirska, Donetsk National Medical University Pryvokzalna str., 27, Lyman, Ukraine, 84404

PhD

Department of Medical Physics and Information Technologies No. 2

Mykola Kuznetsov, Donbas National Academy of Civil Engineering and Architecture Heroiv Nebesnoi Sotni str., 14, Kramatorsk, Ukraine, 84333

PhD

Department of Mechanical Engineering

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Published

2020-10-31

How to Cite

Hrudkina, N., Aliieva, L., Markov, O., Malii, K., Sukhovirska, L., & Kuznetsov, M. (2020). Predicting the shape formation of parts with a flange and an axial protrusion in the process of combined aligned radial-direct extrusion. Eastern-European Journal of Enterprise Technologies, 5(1 (107), 110–117. https://doi.org/10.15587/1729-4061.2020.212018

Issue

Vol. 5 No. 1 (107) (2020): Engineering technological systems

Section

Engineering technological systems

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Copyright (c) 2020 Natalia Hrudkina, Leila Aliieva, Oleg Markov, Khrystyna Malii, Liudmyla Sukhovirska, Mykola Kuznetsov

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