Issue №: 3 (130)
The journal solves the problems of creation and improvement of machinery and technologies for agriculture: 131 - Applied Mechanics, 132 - Materials Science, 133 - Industrial Engineering, 141 - Power Engineering, Electrical Engineering and Electromechanics, 208 - Agricultural Engineering
INVESTIGATION OF FORWARD SLIP DURING HOT ROLLING OF THE AK6 ALUMINUM ALLOY
Kateryna CHMYKH – Postgraduate Student of the Vinnytsia National Agrarian University (Sunny str., 3, Vinnytsia, Ukraine, 21008, e-mail: catherina099@gmail.com, https://orcid.org/0000-0001-8873-4436).
The article presents the results of a comprehensive study of forward slip during hot rolling of the wrought aluminum alloy AK6. Forward slip, defined as the difference between the circumferential speed of the rolls and the actual exit velocity of the metal from the deformation zone, is a key kinematic parameter that determines the accuracy of calculating the elongation zone length and ensures proper synchronization of successive passes in the technological process. Even a minor error in estimating this value may lead to the accumulation of geometric deviations, malfunction of the roll grooves, and defects at subsequent processing stages.
The aim of the study is to determine the regularities of forward slip variation depending on the rolling temperature conditions, degree of deformation, billet geometry, and roll-heating temperature. A series of experiments was carried out using AK6 alloy billets with diameters of 14–25 mm under reductions of 30, 40, and 50 % in smooth rolls with controlled temperature. The billets were heated to 450 °C, while the roll temperature varied from 20 to 450 °C. During rolling, forward slip was recorded and compared with the well-known analytical models of Pavlov, Fink, Ekelund, and Dresden–Golovin.
The results show that forward slip increases with higher reductions due to greater elongation and redistribution of velocities in the near-surface layers. Increasing both billet and roll temperatures reduces the friction coefficient, enhances metal plasticity, and intensifies dynamic recovery and recrystallization processes, which leads to increased forward slip. It was established that within the temperature range of 200–350 °C, at constant reduction, the influence of roll heating is minimal and forward slip changes only slightly. However, further heating to 450 °C results in a significant increase in the parameter – up to 47 %, depending on the deformation level.
The obtained dependencies make it possible to evaluate the influence of key technological parameters on the kinematic behavior of AK6 alloy and improve the accuracy of predicting geometric characteristics during hot rolling. The results can be applied to the optimization of reduction schedules, thermal preparation of billets and rolls, as well as to analytical and numerical deformation models for aluminum alloys.
1. Skriabin, S. O. (2018). Investigation of kinematic parameters of hot rolling of aluminum alloys. Metaloobrobka ta OTT. [in English].
2. Roberts, W., & Hirsch, J. (2010). Fundamentals of rolling. Elsevier. [in English].
3. Ekelund, C. (1999). Slip ratio in hot rolling: Analytical approximations. Journal of Materials Processing Technology. [in English].
4. Golovin, A. (2007). Deformation mechanics in contact zones under rolling. Springer. [in English].
5. Sevidov, A. E., & Muntin, A. V. (2021). Determination of the friction coefficient during hot strip rolling under industrial conditions using forward slip. In METAL 2021 – 30th International Conference on Metallurgy and Materials. DOI: https://doi.org/10.37904/metal.2021.4103 [in English].
6. Shtuts, A., Kolisnyk, M., Vydmysh, A., Voznyak, O., Baraban, S., & Kulakov, P. (2020). Improvement of stamping by rolling processes of pipe and cylindrical blades based on experimental research. Key Engineering Materials, 844, 168–181. . DOI: https://doi.org/10.4028/www.scientific.net/KEM.844.168 [in English].
7. Solona, O., Derevenko, I., & Kupchuk, I. (2019). Determination of plasticity for a pre-deformed billet. Solid State Phenomena, 291, 110–120. . DOI: https://doi.org/10.4028/www.scientific.net/SSP.291.110 [in English].
8. Haydamak, O. L. (2023). Regularities of plasticity reserve restoration and a method for its calculation during deformation with intermediate heat treatment. Metallophysics and Advanced Technologies, 45(10), 1189–1204. [in English].
9. Haydamak, O. L., & Hraniak, V. F. (2024). Study of the processes of forming a metal coating by cold gas dynamic sputtering and development of a technique for calculating sputtering modes. Metallofizika i Noveishie Tekhnologii, 45(12), 1485–1498. . DOI: https://doi.org/10.15407/mfint.45.12.1485 [in English].
10. Voznyak, O., Polievoda, Y., Kupchuk, I., Trukhanska, O., Shvets, L., & Zamrii, M. (2023). Development of an object detection algorithm in halftone images. Przegląd Elektrotechniczny, 99(11), 192–195. [in English].
11. Shvets, L. V., & Chmykh, K. V. (2024). Investigation of metal flow of AK6 aluminum alloy on a modernized hot rolling installation. Tekhnika, Enerhetyka, Transport APK, 126(3), 23–35. . DOI: https://doi.org/10.37128/2520-6168-2024-3-3 [in English].
About the journal
G8 – Materials Science
G9 – Applied Mechanics
G10 – Metallurgy
G11 – Mechanical Engineering (by specializations)
The journal "Engineering, Energy, Transport AIC" is indexed according to the following databases and catalogs:
The All-Ukrainian scientific journal “Technology, energy, agriculture transport AIC” is an open-access scientific publication that publishes the results of original research, theoretical and applied developments, as well as scientific papers in the fields of engineering sciences, energy systems, and transport technologies of the agro-industrial complex.
The main objective of the scientific journal “Technology, energy, agriculture transport AIC” is to disseminate the results of modern scientific research and to promote the development of technical, energy, and transport solutions for the agro-industrial complex through the publication of scientific materials characterized by scientific novelty and practical significance in the field of design and modernization of machinery, equipment, and technologies.
The journal’s activities are focused on supporting the development of engineering science, stimulating the implementation of innovative approaches into industrial practice, as well as ensuring effective exchange of scientific achievements among researchers, educators, engineers, and other specialists in relevant fields.
Objectives of the Journal
To achieve its defined objective, the journal ensures the implementation of the following key tasks:
· publication of the results of fundamental and applied research covering the fields of applied mechanics, mechanical engineering, materials science, energy systems, electrical engineering, electromechanics, and transport systems of the agro-industrial sector;
· promotion of the implementation of advanced technical and technological developments aimed at improving the efficiency of machinery, equipment, and production processes;
· creation of conditions for active scientific exchange among research institutions, higher education institutions, industrial enterprises, and other interested organizations;
· support for the development of interdisciplinary research and expansion of cooperation among specialists in various fields of science and technology;
· promotion of the improvement of the scientific and technical level of research related to the design, modernization, and operation of technical equipment used in agro-industrial production;
· dissemination of information on modern achievements in science and technology and the implementation of innovative technologies in the fields of technical support, energy, and transport;
· development of a scientific information environment that facilitates effective scientific communication and the integration of national research into the international scientific community.
Publication frequency: 4 issues per year
Languages of publication: Ukrainian, English
Editor-in-Chief: Vitalii YAROPUD
State Registration: Decision of the National Council of Ukraine on Television and Radio Broadcasting № 1337 and № 1180. Media Identifier: R30-05173
EDRPOU Code: 00497236
Publisher ROR: https://ror.org/05m3ysc06
Publisher DOI Prefix: 10.37128
Technology, energy, agriculture transport AIC is a scholarly professional journal with a long-standing history and stable academic tradition, reflecting the evolution of engineering and technical sciences within the agro-industrial sector of Ukraine.
The journal was founded in 1997 under the title Bulletin of Vinnytsia State Agricultural Institute. According to the Resolution of the Presidium of the Higher Attestation Commission of Ukraine dated September 11, 1997, the publication obtained the status of a professional scientific journal, which enabled the publication of the main results of doctoral and candidate dissertations in technical sciences. From its inception, the journal positioned itself as an academic platform for addressing current issues of mechanization, electrification, and technical support of agricultural production. During 2001–2014, the journal was published under the title Proceedings of Vinnytsia National Agrarian University. Series: Technical Sciences (State Registration Certificate of Print Media KV No. 16644-5116 PR dated April 30, 2010). Throughout this period, a systematic approach to the selection and peer review of scientific manuscripts was established, the thematic scope of publications was expanded, and continuity of scientific directions as well as the development of sectoral engineering schools was ensured. Since 2015, the journal has been published under its current title, Technology, energy, agriculture transport AIC (State Registration Certificate No. 21906-11806 R dated March 12, 2016). The change of title reflected the expansion of the journal’s thematic coverage and its orientation toward interdisciplinary research in mechanical engineering, energy systems, electrical engineering, transport technologies, automation, and digital solutions for the agro-industrial complex.
