Koyo Seiko Company, Ltd.

Ryoki Kameno

Takao Tamagawa

Yoshiki Fujimoto

Yasuhito Tomochika

A tip for a cutting tool which can apply a heavy residual stress in compression to a material to be cut. This tip has four cutting portions. Each of the cutting portions has first and second rake surfaces having first and second angles of negative values, respectively, relative to an upper surface of the tip. Absolute value of the first negative angle is smaller than that of the second negative angle. The second rake surface is located further from a center of the tip than is the first rake surface, and is also located behind the first rake surface relative to a cutting direction of the tip.

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Osaka, Japan

Ryoki Kameno