Patent ID: 10975919

Abstract:
A method of etching a surface of a metal clutch part for bonding of friction includes etching, by a laser, a plurality of craters into a specified etching area of the surface of the metal clutch part. The specified etching area is defined by an outer circumference and an inner circumference. The craters define an etch pattern on the surface. The laser follows a predefined path during the etching to generate the etch pattern. The path is one of a plurality of radially aligned and circumferentially overlapping figure eights, each of the figure eights extending from the outer circumference of the specified etching area to the inner circumference of the specified etching area; a plurality of rows of circumferentially aligned and radially overlapping figure eights extending from the outer circumference of the specified etching area to the inner circumference of the specified etching area; or a plurality of circumferentially spaced radially extending lines extending from the outer circumference of the specified etching area to the inner circumference of the specified etching area. The method also includes bonding the friction material to the metal clutch part on the etch pattern.