METHOD OF REPAIRING OF UNREGULATED AXIAL PISTON HYDRAULIC MACHINES Russian patent published in 2019 - IPC B23P6/00 F04B1/20 

FIELD: machine building.

SUBSTANCE: invention relates to the fields of mechanical engineering and repair of machine parts and can be used at machine-building and repair-technical enterprises. Method includes the restoration of the openings of the cylinder block with the deaf diamond scan on the machine, surfacing of the pistons with an alloy steel electrode in the mechanized mode at the electrical discharge machines with the discharge energy of 0.9–1.8 J, electrode feed of 0.16–0.19 mm/rev and piston rotation frequency of 8–12 rpm, subsequent grinding of pistons on the grinding machine without the grinding wheel until the gap in the piston-cylinder block reaches 40–45 microns, as well as electrospark hardening of the spherical surface of the cylinder block with tin bronze electrode in the manual mode at the plants with the discharge energy of 0.11–0.22 J and with the processing time of 5.0–6.0 min/cm² with the subsequent grinding and polishing together with the distributor.

EFFECT: invention allows to improve the physical and mechanical properties of metal coatings, to simplify the technology of repair of unregulated axial-piston hydraulic machines by using a wider range of modes of the plants for the electric-spark processing method without the need for constant control of piston sizes.

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