PISTON RESTORING METHOD Russian patent published in 1999 - IPC

FIELD: machine engineering, namely restoring pistons of different hydraulic and pneumatic drive units. SUBSTANCE: method comprising steps of applying basic coat onto worn surface and subsequently working it also includes steps of placing at piston ends technological plugs whose diameters are equal to that of cylindrical surface, preliminarily applying technological coat for filling annular grooves, turning surface until size required before applying main coat; providing rigidity of technological coat lower than that of main coat. EFFECT: enhanced reliability of restored parts of piston, versatility of method. 2 cl