Sumitomo Electric Hardmetal Corp.

Katsuya Nakakihara

Naoki Matsuda

Kouki Matsubara

Yosuke Shimamoto

Atsuhiko Maeta

Tomoyuki Fukuyama

Yusuke Koike

Kazunori Morishige

Yasuyuki Kanada

Shota Tsujimoto

Yoshinari Nagami

Yuta Morisaki

A cutting tool includes a main body. The main body includes a distal end surface, a rear end surface, and a side surface. A spiral first groove and a spiral second groove are formed on the side surface of the main body. The first groove has at least four installation surfaces. The first installation surface is located on a most rear end surface side. The second installation surface is located closer to a distal end surface side with respect to the first installation surface. A length from the first installation surface to the second groove in a circumferential direction along the rotation direction of the main body is set to a first length. A length from the second installation surface to the second groove in the circumferential direction is set to a second length. The first length is longer than the second length.

Cutting tool

Cutting tool insert

Cutting tool body

A cutting tool including: a tool body () provided with an insert support seat () including a major seat surface () that supports a bearing surface of a cutting insert, a plurality of seat side surfaces () that supports side surfaces of the cutting insert at different positions, and a thinned portion () continuous with the major seat surface and the seat side surfaces; and a cutting insert attached to the insert support seat, wherein a ridge at a position where the major seat surface and the thinned portion intersect, a ridge at a position where the seat side surface and the thinned portion intersect, and a ridge at a position where the thinned portions continuous with each other intersect are each formed of a convex arc curved surface.

Cutting tool and tool body

Cutting insert

A cutting insert includes a first surface and a second surface each of which is polygonal and that face away from each other; a side surface that is continuous with the first surface and a side surface that is continuous with the second surface; a cutting edge formed along each of a ridge where the first surface and the side surface intersect and a ridge where the second surface and the side surface intersect; a bearing surface formed in each of a part the first surface and a part of the second surface adjacent to an insert center, the bearing surfaces disposed parallel to each other; and a recessed portion that separates the side surface that is continuous with the first surface from the side surface that is continuous with the second surface. The cutting edge includes three corner edges, a first cutting edge, and a second cutting edge, the first and second cutting edges being continuous with each other and located between each pair of the corner edges. A length of the first cutting edge is greater than that of the second cutting edge, an end portion of the first cutting edge adjacent to one of the corner edges is at a position higher than the bearing surface, and an end portion of the first cutting edge opposite to the end portion adjacent to the corner edge is at a position lower than the bearing surface. Each of the first surface, the second surface, and a cross section of the recessed portion has such a shape that outlines of the shape before and after rotation of the insert by 120&#xb0; around the insert center are coincident with each other. The first surface and the second surface have the same shape, and the second cutting edge of the second surface is located at a corner at which the first cutting edge of the first surface is located.

Cutting insert and milling cutter

A cutting insert, used for a milling cutter, which includes two polygonal main surfaces that are opposite each other and a plurality of side faces and whose main surfaces are rake faces, whose side faces are flank faces, and whose ridge lines at positions where the main surfaces and the side faces cross each other are used as cutting edges include two major side surfaces that are opposite each other and a plurality of minor side surfaces that are formed continuously with the major side surfaces. A mounting hole is provided at the two major side surfaces in a direction in which the mounting hole extends therethrough, and areas of the two major side surfaces are greater than those of the main surfaces. The major side surfaces and the minor side surfaces are provided with flutes along entire regions of the cutting edges.

Cutting insert for a milling cutter

An object is to provide a cutting insert for a milling cutter with which efficiency in machining can be increased. The cutting insert includes two polygonal main surfaces facing each other and side surfaces each connected to a corresponding side of each of the main surfaces. The side surfaces include a major side surface through which an attachment hole extends, a first minor side surface perpendicular to the major side surface, and a second minor side surface disposed between the first minor side surface and the major side surface. A ridge between each of the main surfaces and the major side surface forms a major cutting edge, and a ridge between each of the main surfaces and the second minor side surface forms a minor cutting edge. An angle between the major cutting edge and the minor cutting edge is 145&#xb0; or larger.

Cutting insert and face milling cutter using the same

An object is to provide a cutting insert for milling that has a minor cutting edge for wiping to achieve improved machined surface quality. A minor cutting edgeat a corner includes two circular cutting edge portionsandjoined to major cutting edgeson both sides of the corner and a straight cutting edge portionlocated between the two circular cutting edge portions. The cutting insert satisfies the following conditions: 0.05TA&#x2266;L&#x2266;0.4TA, 0.1L&#x2266;L&#x2266;0.5L, and h&#x2266;15 &#x3bc;m, where TA is the radius of a circle inscribed inside the major cutting edgesas viewed in the thickness direction of the cutting insert, Lis the length of the minor cutting edgein the longitudinal direction of the straight cutting edge portion, L is the length of the straight cutting edge portion, and h is the height of the minor cutting edge

Growing community of inventors

Itami, Japan

Katsuya Nakakihara