Abstract
The results of research in the field of improving the reliability of machinery in the manufacture and restoration of holes of critical parts using surfacing methods, machining by cutting and hardening by electromechanical processing are presented. (Research purpose) The research purpose is improving the quality of repair of body parts by increasing the wear resistance of coaxial holes by electromechanical processing. (Materials and methods) Cylindrical samples made of steel 35 were identified as the object of research after they were surfaced with Np-40G wire and hardened by electromechanical processing. (Results and discussion) It was noted that machine manufacturers do not always provide high quality connections, and first of all by the physical and mechanical properties of the most loaded surfaces of parts. Based on the technical and economic analysis, the choice of surfacing materials was justified in relation to the restoration of coaxial holes of excavator boom. One of the promising methods of operational solution of the problem is the use of electric arc surfacing, mechanical processing by cutting and finishing electromechanical processing. This method allows you to restore the geometric parameters of the holes, increase the hardness and increase the wear resistance of parts. It was established experimentally that after electromechanical processing, the hardness of the deposited metal Np-40G increases from 22-25 to 54-56 on the Rockwell hardness scale. Depending on the modes of electromechanical processing, the depth of the hardened zone can vary from 0.3 to 1.8 millimetres. (Conclusions) On the basis of the conducted research, it was revealed that using the equipment and technology of electromechanical processing, it is possible to make high-quality bushings on a lathe-screw-cutting machine or its use at the final stage of restoration of coaxial holes of the excavator boom by surfacing methods as part of a surfacing and boring complex.
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