DEVELOPMENT OF TECHNOLOGY AND INSTALLATION FOR RESTORATION OF BEARING SEATS IN BASIC PARTS BY ELECTROLYTIC RUBBING
DOI 10.12737/2073-0462-2025-79-86 УДК 621.793
Keywords:
import substitution, basic parts, restoration, electrolytic rubbing, surface quality, wear resistance, reliability.Abstract
In the conditions of a difficult economic situation, the import substitution policy in the agriculture sphere is aimed at ensuring food security of the country. The problem is the wear and tear of the agricultural machinery fleet, which requires significant costs. Updating the fleet of machines is difficult due to the high cost of new equipment, so enterprises resort to repair and restoration of parts. The aim of the research is to increase the efficiency of restoration of internal cylindrical surfaces of machine basic parts by improving the quality and substantiating the modes of electrolytic rubbing, to obtain the specified physical and mechanical properties of the restored surfaces. A laboratory setup with roller anodes has been developed, which ensures the formation of iron coatings when the anode moves along the surface being restored. An anode made of grade 3 steel according to GOST 380–2005 was used. Electrolyte: FeCl2 – 250-300 g/l, KCl – 40-50 g/l, H3BO3 – 15-30 g/l, NaH2PO2 – 15-30 g/l, ascorbic acid – 0.5-2 g/l. Gasket – a technical felt of 6-12 mm thick, with a density of 0.28 g/cm3. A factorial experiment was conducted according to a second-order design. The contact area (0.160-0.277 dm2), anode rotation speed (15-55 min-1), and electrolyte feed (0.42-2.53 l/min) were varied. Conditions: pH=1, current 20-30 A, temperature 52-55°C. The maximum deposition rate was 1030.08 μm/h against the initial value of 460.44 μm/h. The obtained coatings reached a hardness of 59 HRC, wear resistance increased by 20-30%. The following device were used: device 77MT-1, hardness tester TK-2M, scales AND HR-200. A second-order regression equation with the determination coefficient R2 =0.93 was constructed. The dispersion analysis confirmed the significance of all factors (p<0.05). The results allow us to recommend the technology for repair departments of agricultural enterprises. It ensures increased process productivity and reproducibility of coating properties when restoring internal cylindrical surfaces.
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