CUTTING EDGE STRUCTURE FOR CUTTING TOOL, AND CUTTING TOOL WITH THE CUTTING EDGE STRUCTURE

摘要

Provided is a cutting edge structure for a cutting tool including: a base member (6); and a cutting edge member (7) supported by the base member (6) and having higher hardness than the base member (6). The base member (6) includes a first surface (6a) and a second surface (6b) intersecting the first surface (6a). The cutting edge member (7) includes a coating (7) formed by generating electric discharge between the second surface (6b) and a discharge electrode (8) and by depositing a constituent material of the discharge electrode (8) or a reacted substance of the constituent material on the second surface (6b) by using energy of the electric discharge, the discharge electrode (8) being formed by molding powder of metal, powder of a metal compound, powder of a ceramic, or powder of a mixture thereof. The base member (6) and the cutting edge member (7) are formed such that an edge of the coating (7) projects from a cross ridge line between the first surface (6a) and the second surface (6b) toward a distal end side of a cutting edge and that a cutting edge angle (¸) is 10° to 20° inclusive.