Patent ID: 6600130
Filing Date: 2003-07-29
Classification: C23C,F02F,F16J

Abstract:
A method for applying a layer to a piston ring blank (1), in particular for a piston ring of the kind that is intended for use in large diesel engines, characterised in that a coating powder is supplied to one of succeeding imaginary portions (12, 12â€²) of the piston ring blank (1) with the aid of a powder feeding means (3),after which the coating powder is melted with the aid of an energy radiation means (4) at a constant distance from the coating powder which was last supplied to the piston ring blank (1) to form a coating layer on said portion (12, 12â€²) of the piston ring blank, the energy radiation being allowed to act on the coating powder for a period of time which is adjusted so that substantially no heat, besides the heat required for melting the powder material, develops, wherein the piston ring blank (1) is successively moved relative to the powder feeding means (3) and the energy radiation device (4), and wherein the method is initiated and finished in one and the same zone of the piston ring blank (1).