| 摘要 |
Disclosed is a laser working method for a member having an edge. This method is applied to a member having an edge and a protrusion formed at the edge region. The method irradiates both such one of the two faces intersecting across the edge as has that protrusion and the edge region with a laser beam, thereby to melt the edge region, and moves the molten portion to the other face. This laser working method can be properly applied to an oil ring, which has right and left rail portions, and a web portion connecting the rail portions. The web portion has a plurality of through holes formed by melting it, and a remolten solid sticks to the wall faces of the through holes, but no protrusion exists as the molten solid on the outer surface of the web portion. |
