Abstract
Over the past 10-15 years, the use of aluminum alloy parts in the structures of hydraulic systems of agricultural machinery has increased significantly. A large proportion of such parts account for sliding bearings (bushings), the working surfaces of which are subjected to significant wear during operation. Micro-arc oxidation is a modern method of hardening aluminum alloy parts, but it does not allow to restore parts with wear greater than 0.15 millimeters. For the restoration of parts made of aluminum alloys with significant wear, the method of supersonic gas dynamic spraying is promising. (Research purpose) The research purpose is analyzing the technical condition of worn bushings REXROTH of gear hydraulic motors and develop a combined technology for restoring their working surfaces by gas-dynamic spraying with subsequent hardening by micro-arc oxidation. (Materials and methods) Sixty bushings were chosen for the study. A digital micrometer MCC-25-0.001 GOST 6507 was used to measure wear. Powders A-80-13 and A-20-11 by Obninsk Powder Spraying Center were used. A silicate-alkaline electrolyte KOH-Na2SiO3 was used for microarc oxidation. (Results and discussion) Based on the information on wear, authors have developed a combined recovery technology with hardening of the end surfaces of gear motor bushings, which includes: cleaning of bushings; fault detection; pre-machining; supersonic gas dynamic spraying of worn surfaces; hardening by micro-arc oxidation; finishing mechanical treatment of the coating and final control. (Conclusions) The developed combined technology of bushings will allow to increase their wear resistance up to 2.2-2.3 times and significantly increase the service life of hydraulic motors. The technology is universal, and the possibility of restoring the bushings of foreign hydraulic motors using the proposed technology is especially relevant due to the need for large-scale import substitution.
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