Sumitomo Electric Hardmetal Corp.

Sumitomo Electric Industries, Limited

Shingo Hirota

Taiki Mugio

Daisuke Yamanaka

Matsuo Higuchi

Nobuyuki Kitagawa

Harutoshi Ukegawa

Cutting tool holder

The ceramic insert made from a silicon nitride ceramic material and formed with a recess for fastening in the center of its rake face. The recess has a surface roughness Rmax not exceeding 4 .mu.m. The angle between a side face of the recess and a centerline perpendicular to the rake face of the insert is 50-70 degrees. The ratio of the diameter of the recess to the diameter of a circle inscribing the perimeter of the rake face is 30-85%. The recess has a flat or curved bottom. The connecting portion between the side face and the bottom of the recess forms a smoothly curved surface.

Ceramic insert for use with clamp type cutting tool

Growing community of inventors

Itami, Japan

Shingo Hirota