Tungaloy Corporation

Issei Hori

Ryuichi Saji

Provided is a structure for improving accuracy in attaching a cutting tool to a body and making it possible to increase the number of blades while the cutting tool is mounted on the body. A cutting insertincludes: an upper surfacethat has a shape with a lengthwise direction LD and a widthwise direction SD; a lower surface that is located opposite to the upper surface; a peripheral side surfacethat is formed so as to connect the upper surfaceand the lower surface; cutting edgesandthat are respectively formed on an intersecting ridge line of the upper surfaceand the peripheral side surface, and on an intersecting ridge line of the lower surface and the peripheral side surface, and each have a curved ridge line that extends in a lengthwise direction thereof; and a through holethat penetrates from the upper surfaceto the lower surface. End surfacesandlocated in the lengthwise direction LD of the upper surfaceand the lower surface, of the peripheral side surface, are respectively inclined with respect to the upper surfaceand the lower surface, and are parallel to each other. A reference surfacethat is located opposite to the cutting edgesand, of the peripheral side surface, is a flat surface that is orthogonal to the upper surfaceand the lower surface.

Cutting insert, indexable rotary cutting tool, and body of the same

Provided is a cutting tool capable of improving both the biting property to a work material and the chip discharge property. The cutting tool includes a drill body rotated about a central axis, four or more cutting edges formed on one end portion of the drill body to face a forward side of a rotation direction, and a flute groove that is formed between the cutting edges adjacent to each other in a circumferential direction and extends substantially spirally along the central axis. (1) The one end portion includes a first tip portion that includes the central axis and has a first tip angle, and a second tip portion that extends from the first tip portion to an outer peripheral edge of the drill body and has a second tip angle larger than the first tip angle, and (2) the drill body includes a first core thickness portion that is formed in such a manner that a core thickness thereof gradually decreases from the one end portion to the other end portion, and a second core thickness portion that is formed in such a manner that a core thickness thereof is constant from the first core thickness portion toward the other end portion.

Growing community of inventors

Iwaki, Japan

Issei Hori