Sumitomo Electric Hardmetal Corp.

Yasuhiko Okita

Shota Tsujimoto

Sachie Goto

Yasuyuki Kanada

Yosuke Shimamoto

Tomohiro Fukaya

Junya Okida

Hideo Maeno

Naoya Tsuda

Yifan Wen

Taiga Sueyoshi

The boundary flow path is constituted of a pair of boundary wall surfaces facing each other in a first cross section intersecting each of the first flow path, the boundary flow path, and the second flow path. An inclination of a tangent to at least one of the pair of boundary wall surfaces is continuously changed. In a second cross section perpendicular to a direction in which coolant flows, a lateral width of the first flow path is larger than a longitudinal width of the first flow path and a lateral width of the second flow path is larger than a longitudinal width of the second flow path when a longitudinal direction represents a direction in which the pair of boundary wall surfaces face each other and a lateral direction represents a direction perpendicular to the longitudinal direction.

Retaining member and cutting tool

Cutting tool

A superhard sintered body containing cubic boron nitride is bonded to an apical angle part of a tool body having a polygonal shape, and an edge and a chip breaker are formed on the superhard sintered body. A chamfer is formed on the intersection between the upper surface and the side surface of the superhard sintered body, the chip breaker has a protrusion, and an angle &#x3b8; formed by ridges on the apex of the protrusion or a tangential line at a point bisecting the ridges and a bisector for the apical angle and the ratio of the distance between a first intersection between the two ridges on the apex of the protrusion and an extreme point of the first ridge to the distance between a second intersection between a straight line passing through the first intersection and the extreme point and the outer periphery of the tool body and the first intersection are in prescribed ranges.

Indexable insert

Growing community of inventors

Itami, Japan

Yasuhiko Okita