METHOD FOR GASOTHERMIC APPLYING OF COATING ONTO INNER SURFACES OF OPENINGS Russian patent published in 2005 - IPC

FIELD: machine engineering, namely strengthening inner surfaces of openings in parts.

SUBSTANCE: method comprises steps of placing cone having apex angle 60 - 70° and made of heat resistant material with low adhesion capability or metal coated with such material in opening along its axis; setting gap between surface of opening and edge of cone base; feeding onto surface of cone jet of particles of coating material and in addition feeding concentric jet of pressurized gas; rotating cone during process of applying coating and moving it together with torch along coated surface. It is possible to rotate part relative to cone; the last is simultaneously rotated in opposite side. In order to clean surface before starting process of coating applying, nozzle of sand blasting or shot blasting apparatus is placed over cone instead of torch. Jet of abrasive powder or shot jet is directed onto surface of cone. Cone is rotated and together with nozzle it is moved along coated surface. Particles of material to be deposited are thrown by means of cone onto walls of opening. Particles with low energy are blown out through gap.

EFFECT: enhanced quality of coating.

3 cl, 1 dwg, 1 ex