Technology, energy, agriculture transport AIC

Olena IVANKOVA – Candidate of Technical Sciences, Associate Professor, Associate Professor of the Department of Agricultural Engineering and Road Transport, Poltava State Agrarian University (1/3 Skovorody St., Poltava, Ukraine, 36003, e-mail: olena.ivankova@pdau.edu.ua, https://orcid.org/0000-0003-1825-0262).
Vitalii FEDIN – Postgraduate Student (PhD candidate) in specialty 133 Industrial Mechanical Engineering at Poltava State Agrarian University (1/3 Skovorody St., Poltava, Ukraine, 36003, e-mail: vitalii.fedin@pdau.edu.ua, https://orcid.org/0009-0001-6646-5906).

Increasing the durability of machines is a priority task of the technical maintenance and repair industry. In modern conditions, the development and implementation of progressive technologies for the restoration of worn machine parts is of particular relevance, which is one of the priority tasks for our country. At the same time, the processes of plastic deformation in the repair of parts currently have limited application, despite their significant potential. This necessitates the need for targeted research into the use of plastic deformation for the restoration of specific machine parts. 
Hydraulic systems are important components of most machines and mechanisms, and their reliability largely determines the performance of the equipment as a whole. Gear pumps, as key elements of hydraulic systems, operate under conditions of increased loads and intense friction. The main causes of their failures are violations of the adjustment gaps in the mating parts, which arise as a result of reaching the limit of wear, in particular bushings. 
The article provides an analysis of the operating conditions of gear pumps, as well as characteristic defects and types of wear of their parts. The results of the analysis showed the possibility of restoring worn bushings using plastic deformation methods. The restoration method, the choice of equipment, tools and technological process modes are substantiated, and a rational heat treatment mode is proposed. The conclusion is made about the feasibility and possibility of using plastic deformation to restore gear pump bushings in order to increase their durability. 
The use of plastic deformation in the restoration of bushings allows you to compensate for the worn layer of material due to a controlled change in the geometric parameters of the part and the formation of a wear-resistant material structure without the formation of a heat-affected zone. The deposition and distribution processes provide an increase in the physical and mechanical properties and dimensional stability of the restored parts, which contributes to the increase in their operational reliability.

1.    Khitrov, I. O., & Kononohov, Yu. A. (2024). Vidnovlennia detalei plastychnym deformuvanniam ta sposoby dlia yoho zdiisnennia [Restoration of parts by plastic deformation and methods for its implementation]. Vcheni zapysky TNU imeni V. I. Vernadskoho. Seriia: Tekhnichni nauky, 35(74), 1, 191–196. [in Ukrainian].
2.    Aulin, V. V. (Ed.), et al. (2016). Trybofizychni osnovy pidvyshchennia nadiinosti mobilnoi silskohospodarskoi ta avtotransportnoi tekhniky tekhnolohiiamy trybotekhnichnoho vidnovlennia [Tribophysical foundations for increasing the reliability of mobile agricultural and automotive machinery using tribotechnical restoration technologies]. Kropyvnytskyi: Lysenko V. F. (303 p.). [in Ukrainian].
3.    Syvak, R. I., Ohorodnikov, V. A., & Arkhipova, T. F. (2022). Nemonotonna plastychna deformatsiia v protsesakh obrobky metaliv tyskom [Non-monotonic plastic deformation in metal forming processes]. Vinnytsia: Vinnytsia National Agrarian University. (202 p.). [in Ukrainian].
4.    Sivak, R. (2017). Evaluation of metal plasticity and research of the mechanics of pressure treatment processes under complex loading. Eastern-European Journal of Enterprise Technologies, 6/7(90), 34–41. DOI: https://doi.org/10.15587/1729-4061.2017.115040 [in English].
5.    Matviichuk, V. A., & Mykhalevych, V. M. (2016). Rozvytok protsesiv lokalnoho deformuvannia: Teoriia i praktyka obrobky materialiv tyskom [Development of local deformation processes: Theory and practice of metal forming]. Zaporizhzhia: Motor Sich. 339–363. [in Ukrainian].
6.    Vakhrusheva, V. S., Malysh, O. D., & Hruzin, N. V. (2023). Vyznachennia zalyshkovykh napruzhen v trubakh [Determination of residual stresses in pipes]. Metaloznavstvo ta termichna obrobka metaliv, 1(100), 8–13. DOI: https://doi.org/10.30838/J.PMHTM.2413.280323.8.939 [in Ukrainian].
7.    Kammash. (2025). Shesternyi nasos – pryznachennia i osoblyvosti [Gear pump: Purpose and features]. URL: https://kammash.com/ua/shesternij-nasos-priznachennya-i-osoblivosti/ [in Ukrainian].
8.    AGROEXPERT. (2025). Tekhnolohichni osoblyvosti remontu hidrosystem traktoriv [Technological features of tractor hydraulic system repair]. URL: https://agroexpert.ua/tekhnolohichni-osoblyvosti-remontu-hidrosystem-traktoriv/ [in Ukrainian].
9.    Ivankova, O. V. (2011). Sposib vidnovlennia ta zmitsnennia stalevykh vtulok [Method for restoration and strengthening of steel bushings] (Ukrainian Utility Model Patent №. 59687; IPC C21D 1/06, B23P 6/00). Ukrainian Institute of Industrial Property. [in Ukrainian].
10.    Matviichuk, V. A., Mykhalevych, V. M., & Kolisnyk, M. A. (2022). Otsinka deformovnosti materialu zahotovok pry priamomu i zvorotnomu vytyskuvanni metodom shtampuvannia obkochuvanniam [Evaluation of material deformability during forward and backward extrusion by rotary forging]. Vibratsii v tekhnitsi ta tekhnolohiiakh, 1(104), 81–91. [in Ukrainian].
11.    Ivankova, O., & Fedin, V. (2025). Research on the restoration of gear pump parts by plastic deformation. Central Ukrainian Scientific Bulletin. Technical Sciences, 12(43), 175–186. DOI: https://doi.org/10.32515/2664-262X.2025.12(43).1.175-186 [in English].
12.    KCM. (2025). Starinnia aliuminiiu: vydy ta efektyvnist [Aging of aluminum: Types and efficiency]. URL: https://kcm.in.ua/starenie-vidy-i-effektivnost/ [in Ukrainian].