Development of technologies for hot pressing of rods made from 7075 aluminum alloy on a radial­shear mill of a new design – numerical modeling

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.214919

Keywords:

aluminum alloy, mathematical modeling, Avrami equations, physical modeling, recrystallization, microstructure

Abstract

The paper proposes a radial shear mill (RSM) of a new design, which allows manufacturing metal rods of small diameters or wires with a fine-grained structure. The paper presents the results of modeling the evolution of the structure during hot rolling-pressing of aluminum alloy 7075 on the RSM. Mathematical modeling of the technological process was carried out using the MSC.SuperForge, and the empirical Johnson-Mehl-Avrami-Kolmogorov equation was used to predict the passage of softening processes. Due to the absence of the coefficients of the Avrami equation, a series of experiments on physical modeling of the rolling-pressing technological process were conducted on an STD 812 torsion rheometer. The experiments were conducted at the temperature range of 250–450 ℃ and a strain rate of 1.0–20 s-1. By using physical modeling, it was proved that during processing on the RSM, it is necessary to develop a torsional deformation over the entire section of the workpiece, which leads to effective refinement of the structure. The derived formulas and simulation modeling of the obtained values of the stress-strain state (SSS) were used to simulate the technology of the combined process. Moreover, rational temperature-rate conditions were determined to deform the workpiece on the RSM. It was proved by mathematical modeling that shear deformations develop along the entire section of the workpiece during processing on the RSM, which leads to effective refinement of the structure and the formation of a fine-grained structure in the rods, i. e. products of the required quality are manufactured

Author Biographies

Serik Mashekov, Satbayev University Satpaev str., 22a, Almaty, Republic of Kazakhstan, 050013

Doctor of Technical Sciences

Department of Transport Technology

Yerik Nugman, Satbayev University Satpaev str., 22a, Almaty, Republic of Kazakhstan, 050013

PhD

Department of Industrial Engineering

Aigerim Mashekova, Satbayev University Satpaev str., 22a, Almaty, Republic of Kazakhstan, 050013

PhD

Department of Industrial Engineering

Aimangul Sekerbek, S. Seifullin Kazakh Agrotechnical University Zhenis ave., 62, Nur-Sultan, Republic of Kazakhstan, 010011

PhD

Department of Technical Mechanics

Nurbolat Sembayev, S. Toraighyrov Pavlodar State University Lomov str., 64, Pavlodar, Republic of Kazakhstan, 140008

PhD

Department of Transport Equipment and Logistics

Symbat Akparova, Satbayev University Satpaev str., 22a, Almaty, Republic of Kazakhstan, 050013

Master of Engineering

Department of Industrial Engineering

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Published

2020-10-31

How to Cite

Mashekov, S., Nugman, Y., Mashekova, A., Sekerbek, A., Sembayev, N., & Akparova, S. (2020). Development of technologies for hot pressing of rods made from 7075 aluminum alloy on a radial­shear mill of a new design – numerical modeling. Eastern-European Journal of Enterprise Technologies, 5(12 (107), 23–31. https://doi.org/10.15587/1729-4061.2020.214919

Issue

Vol. 5 No. 12 (107) (2020): Materials Science

Section

Materials Science

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Copyright (c) 2020 Serik Mashekov, Aigerim Mashekova, Sembayev Nurbolat, Yerik Nugman, Aimangul Sekerbek, Symbat Akparova

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