Sumitomo Electric Hardmetal Corp.

Sumitomo Electric Industries, Limited

Atsuhiko Maeta

Kouki Matsubara

Katsuya Nakakihara

Yusuke Koike

Yoshinari Nagami

Yasuyuki Kanada

Tomoyuki Fukuyama

Shigenori Emoto

Yuta Morisaki

Kazuchika Nasu

Shinya Imamura

Naoki Matsuda

Kunishige Tanaka

Shota Takemura

Shota Tsujimoto

Ai Tanaka

A cutting insert according to the present disclosure includes a first surface, a second surface, a side surface, and a cutting edge. The first surface has a rake face continuous to the cutting edge. The cutting edge has a corner cutting edge, a flat cutting edge, and a main cutting edge. The rake face has a first rake face portion, a second rake face portion, and a third rake face portion, the first rake face portion being continuous to the flat cutting edge, the second rake face portion being continuous to the main cutting edge, the third rake face portion being continuous to the corner cutting edge and being located between the first rake face portion and the second rake face portion. The rake face is provided with a level difference portion.

Cutting insert

The cutting edge has: a corner cutting edge; a flat cutting edge continuous to a first end portion of the corner cutting edge; and a main cutting edge continuous to a second end portion of the corner cutting edge opposite to the first end portion of the corner cutting edge. The rake face has: a first rising surface portion; and a first rake face portion continuous to the first rising surface portion and located opposite to the corner cutting edge when viewed from the first rising surface portion. When viewed in a direction perpendicular to the reference surface, the first boundary includes a first line segment extending, from one of the flat cutting edge and the corner cutting edge, in a direction crossing a straight line extending along the main cutting edge.

A cutting edge has a corner cutting edge, a flat drag, and a main cutting edge. The rake surface has a first rake surface portion, a second rake surface portion, and a third rake surface portion. The first rake surface portion has a first inclined surface inclined at a first angle. The second rake surface portion has a second inclined surface inclined at a second angle greater than the first angle. The first end portion and the second end portion are higher than the reference surface in a direction perpendicular to the reference surface, and the main cutting edge extends so as to intersect the reference surface when viewed in a direction parallel to the reference surface. A first step portion rising from the third rake surface portion and continuous with the first rake surface portion is provided on the rake surface.

Cutting tool

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

To reduce burrs that may be formed at a corner portion of a machined surface in a face milling process, there is provided a cutting insert that does not tend to form burrs. A milling cutting insert includes cutting edges provided as ridges each defined by an upper or lower face and a side face that intersect each other, the cutting edges including a flat cutting edge. The cutting edge include a major cutting edge provided between adjacent ones of corner portions, the flat cutting edge provided at the corner portion, and a minor cutting edge provided between the major cutting edge and the flat cutting edge. A surface roughness of a side face that is continuous with the major cutting edge is higher than a surface roughness of a side face that is continuous with the minor cutting edge.

Milling 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

A positioning section that positions a cutting edge, used in cutting, at an indexed point is provided at a portion of a round insert towards a bottom surface at a periphery of the round insert. A support seat, provided at a tool body, includes a first seat side surface, a second seat side surface, and a restraining section. The first seat side surface and the second seat side surface contact and support side surfaces of the round insert that are disposed 90 degrees apart from each other. The positioning section is fitted to the restraining section by bumpy portion fitting. Only one restraining section is provided. A second relief portion that is larger than a first relief portion is provided at a corner at a side of the second seat side surface.

Indexable cutting tool

Corner cutting edges (and) each having a side portion connected to a minor cutting edge and curved in the same direction as that in which the minor cutting edge is curved are formed on opposite sides of the minor cutting edge () of an indexable cutting insert for milling including a major cutting edge () formed of a ridge formed by an intersection of a rake face and a flank face and the minor cutting edge () for finish machining curved in a convex manner when viewed from a direction perpendicular to the flank face, and the minor cutting edge () continues to the major cutting edge () via the corner cutting edges (and).

Indexable cutting insert for milling

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

The present invention includes a first ridge line positioned at an intersection between a first surface and an upper side section of a side surface along the first surface; and a second ridge line positioned at an intersection between a second surface and a lower side section along the second surface of the side surface. A cutting section is formed at the first ridge line with the first surface forming a rake face. A second cutting section is formed at the second ridge line with the lower side section along the second surface of the side surface forming a rake face. Selective use can be made of the first cutting section and the second cutting section.

Throw-away cutting insert and cutting tool with replaceable cutting edge using the same

An indexable drill which has cutting edges formed of a plurality of indexable inserts and which provides stable performance so that the accuracy of entrance hole diameter and exit hole diameter is improved and generation of burrs at the hole exit can be suppressed. Indexable inserts which form a center cutting edge and a peripheral cutting edge are attached to a drill main body at an end thereof. A ratio between a cutting contribution of the center cutting edge and a cutting contribution of the peripheral cutting edge is set such that the cutting contribution of the center cutting edge is larger. The indexable insert is disposed so at to project forward in the axial direction from the indexable insert so that an outer-end corner of the peripheral cutting edge engages a workpiece first.

Growing community of inventors

Itami, Japan

Atsuhiko Maeta