METHOD FOR REPAIRING VOLUMETRIC HYDRAULIC DRIVE Russian patent published in 2022 - IPC B22D19/10 B23P6/02 B24B37/11 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to the field of mechanical engineering, for the repair of machine parts and can be used in machine-building and maintenance enterprises. The proposed method for repairing a volumetric hydraulic drive includes hardening the surface of a brass distributor with an electrode in manual mode, followed by finishing on cast-iron finishing plates together with a steel distributor; restoration of holes in cylinder block bushings and holes in valve boxes; surfacing on the surface of the pistons and spools of the valve box with electrodes in a mechanized mode. The surface of the brass distributor is hardened with a brass electrode in manual mode on an electric spark installation with a pulse energy of 0.04 J, a pulse frequency of 1280 Hz and a processing time of 5 min/cm2, followed by mechanized finishing on a grinding and polishing machine together with a steel distributor. The holes of the cylinder block bushings and valve boxes are restored by machining with blind diamond reamers on a precision machining machine. On the surface of the pistons and spools of the valve box, a metal coating is deposited with a high-carbon steel electrode in a mechanized mode on an electric spark installation with a longitudinal electrode movement speed of 0.5 mm/min, a pulse energy of 10 J, a pulse frequency of 50 Hz, a rotational speed of pistons and spools of 2 rpm min, number of passes 1. The welded pistons and valve box spools are ground on a centerless grinding machine until the clearance in the joints “piston - cylinder block bushing hole” is 25...46 microns, “spool - valve box body hole" is 8...16 microns.

EFFECT: increasing the accuracy of dimensions and geometric parameters of the parts to be restored and reducing the complexity of repairs.

1 cl, 1 tbl