| 摘要 |
PURPOSE:To guide a chip to be naturally detached from a face of a cutting edge in a cutter and improve its sharpness, by constituting the cutting edge such that its face is formed in a protrusively curved circular arc-shape providing the effective rake in the radial direction at a positive angle. CONSTITUTION:A face F of a cutting edge forms the whole part or its peripheral edge part in a circular arc-shaped helical surface protrusively curved toward the rotating direction Re of a cutter. And the cutting edge holds the effective rake R in the radial direction, which the face F forms in a peripheral edge 3 of the cutting edge, to a positive angle. In this way, the cutter, in which the curving direction of the protrusively curved surface in the face F and the naturally winding direction of a cutting chip are well utilized, improves sharpness by detaching the chip from the face F and reducing cutting resistance. |
