Abstract: A cutting tool formed by a coating layer on a substrate has cutting edges that feature serrations. The linear dimensions of the serrations may vary from a few nanometers up to 10 microns. The serrations result in a smoother cut edge on the workpiece, particularly when the workpiece is formed of certain materials that are seen as particularly difficult to cut, such as hardened steels.

Abstract: A cutting insert according to an embodiment of the present invention includes an upper surface; a side surface; and a cutting edge located at an intersection region of the upper surface and the side surface. The upper surface includes a rake surface continuous with the cutting edge; and a rising surface inclined and lying at a higher position as going inward from the rake surface. The rake surface includes a pair of first raised parts respectively extending inward from near both ends of the cutting edge in a top view; and a second raised part extending from one of the pair of first raised parts to the other. A cutting tool including the cutting insert, and a method of manufacturing a machined product by using the cutting tool are also provided.

Abstract: A cutting insert having excellent chip discharge performance is provided. In the cutting insert of the present invention, a bottom surface of a concave groove 21 includes a first bottom surface 211 continuous with a cutting edge part 5, and a second bottom surface 212 which is located on a side further remote from the cutting edge part 5 than the first bottom surface 211, and is located at a lower position than a virtual extension line L1 of an end portion of the first bottom surface 211 on a side remote from the cutting edge part 5. Further, a pair of inclined surfaces 23 are located on a side further remote from the cutting edge part 5 than the end portion of the first bottom surface 211 on the side remote from the cutting edge part 5 in a top view. Therefore, the diameter of generated chips decreases by the fact that the chips are curled while sinking in space formed at a lower position than the virtual extension line L1 of the first bottom surface 211.

Abstract: A cutting insert has a main body which is provided with an upper surface, a side surface, at least one groove which is formed in the side surface and which extends to the upper surface at one end, and a plurality of split cutting blades which are split by the at least one groove. The upper surface is provided with inclined portions corresponding to the split cutting blades. The distance of respective lower ends of the inclined portions from the corresponding split cutting blades increases toward the centers of the corresponding cutting blades in a plan view. A cutting tool having the cutting insert and a method for cutting a workpiece using the cutting tool are also provided.

Abstract: A rotary cutting tool, such as a milling cutter (10) includes a central hub (12), a cutting rim (14) and a plurality of spokes (22) connecting the central hub (12) to the cutting rim (14). Each spoke (22) is separated by an opening (32) and polygonal in cross-sectional shape formed by two side walls (22a, 22b), two front walls (22c, 22d) and a rear wall (22e). One of the side walls (22a) of each spoke (22) is formed at a pitch angle (42) with respect to a central axis (11) of the cutting tool (10) that is sufficient to cause lift of chips through the opening (32), thereby providing effective chip evacuation during a material removal operation.

Abstract: The invention relates to a milling tool, particularly a face-milling cutter, with a rotationally symmetrical tool base body which can be driven in rotation and in which at least one pocket-like recess is made on the periphery, with a cutting body which is inserted in the recess, which projects radially and/or axially on the tool base body and which is held by at least one clamping element, on the outer periphery of the milling tool at least one chip guide chamber being made with chip deflecting surfaces for controlled chip removal away from the workpiece surface to be machined. According to the invention, the chip guide chamber is assigned at least one chip guide web which separates the chip guide chamber from the surface of the workpiece.

Abstract: A carbide cutting tip including a rear surface and a bottom surface for mounting the tip to a cutting tool tooth, a top surface having a pair of peaks separated by a trough, the top surface including a frontward facet and a rearward facet sloped downwardly and rearwardly at a non-zero angle ? with respect to the frontward facet, and a front surface having a substantially flat lower portion and a concave upper portion having a shape defined by a segment of an ellipse, the lower portion being disposed substantially perpendicularly to the frontward facet of the top surface, the lower portion and the upper portion joining at a break point located at the apex of the major axis of the ellipse, the major axis of the ellipse being canted frontwardly from the break point at a non-zero angle ? with respect to the lower portion of the front surface.

Abstract: A cutting insert has an upper face, a lower face, a side face, an upper cutting edge, a lower cutting edge and a through hole. The upper face has a substantially polygonal shape. The side face has a first side face and a second side face. The first side face has at least one upper concave part and at least one lower concave part. The at least one upper concave part and the at least one lower concave part are separated from each other through a thick part being continuous along a width direction of the side face. The thick part has a curved region extending in the shape of a wave from one end to the other end in the width direction of the first side face in a side view.

Abstract: Provided are a drill that enhances work efficiency and process accuracy of a boring process, and a boring device enabling dust collection and recovery by using the drill. In a drill formed with a chip exhaust 102 along a center of an axis in a drill body 101, a large-diameter cylindrical body 101a with an outer diameter increased via a different level part G or G? is provided on a base end side of the drill body 101, first cutting edges 110 are provided on a tip part of the drill body, first scrap lead pockets 112 leading to the chip exhaust are provided in the vicinity of the first cutting edges 110, second cutting edges 120 are provided on the different level part, and second scrap lead pockets 122 leading to the chip exhaust are provided in the vicinity of the second cutting edges 120.

Abstract: A cutting insert that includes a cutting edge; a rake face region formed continuously with the cutting edge; and a clamp face region located more inward and higher than the rake face region is provided. The cutting insert includes a first rake face formed continuously with the cutting edge; a second rake face formed in an inclined surface shape from the first rake face toward the clamp face region; a projection formed so that at least a part of the projection is located on the first rake face, and includes a top portion at a position corresponding to a middle region of the cutting edge; and a concave part or a convex part formed so that at least a part is located on the second rake face, and located more inward than the projection. Chip accumulation into the insert and frictional resistance generated in the rake face region is decreased.

Abstract: A cutting insert including a substrate having a seat recessed from a top surface at a corner and a superhard sintered body bonded to the seat. The body includes a cutting edge, a rake face with positive rake angle, and chip breaker including, in plan view, a projection projecting from a line that crosses a bisector of the corner toward a tip end of an arc edge of the cutting edge. A first breaker wall is formed between a top edge of the projection and the rake face. A second breaker wall is formed between a ridge line extending from a base end of the projection to a side surface of the body and the rake face. Another ridge line formed between the rake face and the side surface is inclined whereby a distance to a bottom surface of the substrate decreases as a distance from the cutting edge increases.

Abstract: A holder of the present invention has a first insert pocket and a second insert pocket at the tip end thereof. The first insert pocket is located closer to the central axis thereof than the second insert pocket. The axial rake of the first insert pocket is larger than the axial rake of the second insert pocket.

Abstract: The invention relates to a milling cutting insert having a square or triangular shaped cutting face delimited in the plan view by a peripheral cutting edge having linear cutting edges (10) and curved cutting corners (11). According to the invention, each of the cutting edges (10) comprises an inclined region (10a) sloping toward a cutting corner (11), extending beyond the tangential point (14) determined by the point at which the linear cutting edge (10) transitions into a curved cutting corner (11), wherein adjacent thereto the cutting edge (10b) rises prior to the point (24) determined by a cutting corner angle bisector (15), wherein said rising region (10b) extends to a cutting edge maximum (17) on the other side of the cutting corner (11) on the adjacent cutting edge (10), which is linear in plan view, from where the cutting edge (10) continues, again inclined and sloping downward, resulting in a rotationally symmetric form having identically shaped cutting edges.

Abstract: A cutting insert has an upper abutment portion at an upper surface thereof, and two bottom abutment portions and a stopper portion, at a bottom surface thereof. The two bottom abutment portions define bottom planes, parallel and spaced apart from one another. The upper abutment surface defines an upper plane, forming a first angle with the bottom planes. The cutting insert has a relief surface at a front surface thereof, forming a cutting edge with a rake surface formed at the upper surface. The stopper portion defines a stopper plane, which forms a second angle with a relief plane defined by the relief surface. A reference plane perpendicular to the upper plane, passing through the upper abutment portion, intersects the first and second bottom planes at first and second intersection lines, which are spaced apart from the first and second bottom abutment portions.

Abstract: The invention concerns a cutting insert comprising an upper and a lower surface and one or more edge surfaces which connect the upper surface and the lower surface together, wherein provided at the transition of at least one edge surface at least to the upper surface is at least one cutting edge, wherein the upper surface adjoining the cutting edge is in the form of a chip surface and the edge surface adjoining the cutting edge is in the form of a tool flank. To provide a cutting insert in which the chip break range is enlarged and the risk of damage to the cutting insert and/or the tool and/or the workpiece by coiling chips is reduced it is provided according to the invention that at least one recess is provided in the tool flank at a spacing from the cutting edge.

Abstract: A milling insert and a milling tool for the milling of a slot in a work piece. The milling insert includes an under side, an opposite upper side that forms a chip surface and is parallel to an extension plane, and an edge side disposed between the upper side and the under side. A cutting edge, which extends between the edge side and the chip surface, has a primary main cutting edge, a secondary main cutting edge, and an end cutting edge. The end cutting edge connects the primary main cutting edge and the secondary main cutting edge and borders on the primary main cutting edge at a primary transition point and on the secondary main cutting edge at a secondary transition point. A normal to the extension plane of the chip surface forms an acute clearance angle with the edge side along the cutting edge. The end cutting edge is curved from the primary transition point to the secondary transition point.

Abstract: An indexable insert having two main faces (1) that face away from one another and that each have a full-perimeter cutting edge (3) at the face periphery, and having a chip step (6) adjoining the cutting edge (3), having a continuously curved surface.

Abstract: A cutting insert has a cutting edge formed at an intersection of a rake surface and a relief surface, with a chip-control arrangement located at the rake surface. The chip-control arrangement includes a plurality of recesses that extend downwardly into the rake surface and a plurality of projections that extend upwardly from the rake surface. The plurality of recesses follow a pattern of increasing depth in a rearward direction from the forward portion of the cutting edge. The plurality of projections follow a pattern of increasing height in a rearward direction from the forward portion of the cutting edge.

Abstract: A round cutting insert with an anti-rotation feature. The round cutting insert includes a plurality of projections formed on a first surface and another plurality of projections formed on an opposing surface. The round cutting insert is reversible and indexable. The round cutting insert is removably received in an insert receiving pocket in a tool body wherein the insert receiving pocket includes a plurality of dimples for receiving one of the plurality of first projections or the plurality of second projections. This arrangement prevents rotation of the round cutting insert while mounted in the insert receiving pocket.

Abstract: A cutting insert having a base portion structured to be coupled to a tool body, the base portion having a leading end, a trailing end, and a mounting face extending therebetween. A number of cutting portions extend from the base portion opposite the mounting face. Each cutting portion of the number of cutting portions includes a cutting face disposed adjacent the leading end of the base. The cutting face having an angled portion disposed at a first angle with respect to a reference plane oriented parallel to the leading end and perpendicular to the mounting face. The cutting face also having a curved portion disposed between the angled portion and the base portion.

Abstract: A cutting insert has a chip-control arrangement. The cutting insert includes opposing top and bottom ends and first and second side surfaces that extend therebetween and meet at a cutting corner having a bisector. The chip-control arrangement also includes an elongated surface extending in an upward direction from the top end face, and also extending longitudinally to opposing sides of the bisector. The elongated surface includes a first and second extremity. The first extremity is closer to the first side surface than to the bisector, and the second extremity is closer to the second side surface than to the bisector.

Abstract: An insert includes a rake angle set corresponding to the hardness of a material to be cut and that can suppress an increase in the material cost even when the strength of a cut edge section is increased. The insert has a polygonal shape and includes a cutting edge portion on at least one side of the polygonal shape. The cutting edge portion includes a rake face having a convex formed on one of opposite surfaces in the thickness direction, a flank face having a concave formed on a surface intersecting with the one surface in the thickness direction and a concave cutting edge that is formed between the rake face and the flank face.

Abstract: A groove insert to be received in a tool holder has, along its top and bottom side and on its rear side, a holding structure which is formed by holding faces which taper toward one another and by way of which the groove insert is fixed in the tool holder in a positive locking manner. The tool holder has corresponding counter faces. The groove insert and the tool holder form a groove cutting tool.

Abstract: Disclosed is an edge for a tool and/or for an insert to be removably and/or fixedly mountable on a tool. The edge is formed at a meeting of a first surface and a second surface comprises at least one segment extending from a first peak to a second peak through a nadir interposed therebetween. The first peak has a first peak line passing therethrough, the second peak having a second peak line passing therethrough, and the nadir having a nadir line passing there-through. The first peak line, the second peak line, and the nadir line are parallel to each other, and a first depth D1 between the nadir line and the first peak line is greater than a second depth D2 between the nadir line and the second peak line.

Abstract: A cutter comprises a superhard construction, the cutter having a cutting edge defined by a rake face, and a flank extending therefrom. The cutter also has first and second regions, the first region abutting the second region along a boundary, the first region having a different material composition from the second region. At least the second region comprises superhard material, the material of the first region has a different coefficient of thermal expansion (CTE) from the material of the second region. The second region extends around the peripheral edge of the first region defined by the boundary to form a collar therearound, the first region and/or the second region extending to and/or forming at least a part of the rake face.

Abstract: In cutting processes of a tree-shaped groove, in a rough cutting process, by using a rough cutting tool (20), as well as cutting a tapered groove (2), cutting is performed in a first narrow portion (11), a second narrow portion (12), and a third narrow portion (13) of a planned groove shape 10 such that a specified cutting allowance is left. In the following semi-finishing process, by using a semi-finishing tool, cutting is performed for portions other than the three narrow portions (11 to 13) that have already been cut. Because a work material 1 does not come in contact with three reduced diameter portions, of the semi-finishing tool formed in an upside-down Christmas tree shape, corresponding to the three narrow portions (11 to 13), a load is not imposed on the three reduced diameter portions, which are weak against shock among all portions of the semi-finishing tool, and the cutting feed can therefore be faster. Further, by performing a finishing process, the tree-shaped groove can be efficiently cut.

Abstract: A cutting insert according to an embodiment of the present invention includes an upper surface, a side surface, and a first cutting edge located at an intersection of the upper surface and the side surface. The upper surface includes a pair of raised parts located opposite to each other with a perpendicular bisector of the first cutting edge interposed therebetween. A top of each of the pair of raised parts includes at least two protrusions oriented toward a direction along the perpendicular bisector in a top view. Each of the at least two protrusions includes a first protrusion located on a side closest to the perpendicular bisector, and a second protrusion which is located on a side further away from the perpendicular bisector than the first protrusion, and is located at a higher position than the first protrusion. A cutting tool including the cutting insert, and a method of manufacturing a machined product by using the cutting tool are also provided.

Abstract: A blade for cutting multi-angle valve seat profiles has a plurality of angles machined on its surface which combine to form rake and relief angles that machine concentric valve seats and chatter free finishes. The method of machining several valve seat angles in one cycle of valve cutter as opposed to having multiple valve seat cutters at different angles will accelerate the task of machining valve seats on cylinder heads on internal combustion engines.

Abstract: A cutting insert having low cutting resistance and excellent chip discharge performance is provided. The cutting insert 1 according to an embodiment of the present invention includes an upper surface 2, a lower surface 3, a side surface, and a cutting edge 5 disposed between an intersection of the upper surface 2 and the side surface 4. The upper surface 2 includes a rake surface continuous with the cutting edge 5. The rake surface includes a first rake surface 21 which is located correspondingly to a middle part of the cutting edge 5, and is parallel to a horizontal plane L including the intersection or is inclined downward as the first rake surface separates from the cutting edge 5, and a pair of second rake surfaces which are located on both sides of the first rake surface 21 and are inclined upward as the second rake surfaces separate from the cutting edge 5, and which include concave parts 2231b and 221c.

Abstract: A cutting tool with a substrate which is coated with a coating layer containing TiaAlbNbdMe(C1-xNx), where M represents one or more elements selected from among Si, W, Mo, Ta, Hf, Cr, Zr and Y, where 0.1?a?0.7, 0?b?0.8, 0.02?d?0.25, 0?e?0.25, a+b+d+e=1.0 and 0?x?1 and is provided with a rake face; a flank face; a cutting edge between the rake face and the flank face; and droplets on the surface of the coating layer. The droplets include finer droplets having particle diameters of 300 nm or less; and coarser droplets having particle diameters of 1000 nm or more. The flank face has a higher percentage of the finer droplets than the rake face. An Nb content in the coarser droplets on the flank face is higher than an Nb of the coarser droplets on the rake face.

Abstract: A sintered cubic boron nitride tool can perform stable machining without causing any defect for a long lifetime even under a high-load cutting condition and a high-efficiency cutting condition.

Abstract: A cutting insert has the geometry of a tetrahedron with triangle base areas wherein each triangle base area has a tetrahedral frustum as a clamping body for fixing the cutting insert in a tool seat of a carrier tool. Additionally, a tool seat for the cutting insert includes clamping jaws to secure the cutting insert.

Abstract: An improved design of a cutting insert system includes a plurality of indexable peripheral milling cutting inserts adapted to be mounted on a peripheral milling tool holder. Each of the cutting inserts includes an insert width that is the same for each cutting insert. Each of the cutting inserts also includes a corner nose having a corner nose radius dimension that is different for each cutting insert, and an axial alignment clearance face that defines an equivalent face location and an equivalent clearance angle for each of the plurality of cutting inserts when the insert is detachably mounted on the tool holder.

Abstract: A cutting tool for performing cutting operations on a workpiece when the cutting tool is rotated about a central axis by a machine tool, the cutting tool includes a generally cylindrical body disposed about the central axis. The generally cylindrical body includes a first end and an opposite second end. The cutting tool further includes a cutting portion and a mounting portion. The cutting portion is disposed at or about the first end of the generally cylindrical body and includes a number of cutting edges structured to engage the workpiece during cutting operations. The mounting portion is disposed at or about the opposite second end of the generally cylindrical body and is structured to be coupled to the machine tool. At least a portion of the generally cylindrical body comprises a molded portion formed via a molding process about the cutting portion in a manner that couples the cutting portion to the generally cylindrical body.

Abstract: A cutting insert according to an embodiment of the invention includes: an upper surface; a lower surface; a side surface which is connected to each of the upper surface and the lower surface, and includes a first side surface and a second side surface adjacent to each other; and a cutting edge including a major cutting edge located at an intersection of the upper surface and the first side surface, and a minor cutting edge located at an intersection of the upper surface and the second side surface. The upper surface includes a rake surface which is located along the major cutting edge, and is inclined downward as the upper surface separates from the major cutting edge. The second side surface includes a second upper constraining surface and a second lower constraining surface in order as the second side surface goes from the upper surface to the lower surface.

Abstract: The description shows a chip breaker system for a drilling, turning, milling or reaming tool, wherein the chip breaker system comprises: a portion of a flute and a first area which is produced by a progressive cut, wherein a first edge is arranged between the portion and the first area in such a way that chips produced by a cutting movement of the drilling, turning, milling or reaming tool can be broken at the first edge. The application further relates to a high-speed reamer comprising such a chip breaker system, a reamer made of solid carbide, a reamer with axially extending cooling channels which are disposed in a decentralized manner, a reamer with cooling channels which are unevenly distributed in the peripheral direction, and a reamer with cooling channels, wherein the outlet openings of the cooling channels are arranged on different cutting planes.

Abstract: A double-sided milling cutting insert has usable upper and lower faces. The upper face has a polygonal shape with curved edges. The lower face has a rotationally symmetrical relation to the upper face. Flank faces connect edges of the upper face to corresponding edges of the lower face. Upper cutting edges are formed on one of the edges of the upper face. The upper chip-forming portions have rake faces inclined downwardly from the upper cutting edges inwardly of the cutting insert and a plurality of protrusions arranged along inner boundaries of the rake faces for deflecting chips. When the cutting insert is mounted on the cutting tool, a width of the rake face of the upper chip-forming portion adjacent to an edge portion forming a main cutting edge gradually increases in a direction going away from a rotational axis of the cutting tool.

Abstract: Cutting inserts are described having at least two discontiguous clearance faces. Cutting tool systems including the cutting inserts are also described. An indexable cutting insert includes a top face, a bottom face, and at least two clearance faces connecting the top face and the bottom face at a periphery of the cutting insert. The at least two clearance faces include a primary clearance face contiguous with the top face and forming a cutting edge at an intersection of the primary clearance face and the top face, and a secondary clearance face discontiguous with the primary clearance face and separated from the primary clearance face by a bridge surface, and wherein a primary clearance angle formed by the primary clearance face is larger than a secondary clearance angle formed by the secondary clearance face.

Abstract: A cutting insert used in rotary cutting tools for performing turning spinning operations has an upper surface and an opposing base surface with a peripheral surface therebetween, the peripheral surface intersecting the upper surface to form a cutting edge. The cutting edge may be a continuous circular cutting edge. The upper surface has rotational asymmetry about an insert axis passing between the upper surface and the base surface, by virtue of having at least one spiral shaped protrusion with a chip deflection distance which continuously increases in a rotational direction about the insert axis for greater than 180°. The cutting insert is assembled to a cutting tool body having a shank portion and a cutting portion sharing a longitudinal axis, the insert axis being aligned with the longitudinal axis and the cutting insert secured in an insert receiving pocket of the cutting portion.

Abstract: A cutting insert has at least first and second side surfaces, with a chip-control arrangement. The chip-control arrangement includes at least one projection disposed at an intersection of a corner of the cutting insert. When the chip-control arrangement includes two projections they can be disposed symmetrically on both sides of the intersection. Each of the at least one projections is elongated and extends longitudinally along an associated side surface.

Abstract: A cutting insert, wherein: a cutting edge part having a quadrangular shaped cutting face, which is provided with a pair of side cutting edges extending in a longitudinal direction of an insert body, and a front cutting edge between ends of the side cutting edges that extends in a direction that intersects the longitudinal direction, is formed at an end of the insert body having a bar-shape; and viewed from a direction facing the cutting face perpendicularly to the longitudinal direction, at least one of a pair of corner edges where the side cutting edge and the front cutting edge intersect is formed in a convex shape such that it has a point of inflection at which, after a tangent line that makes contact with the corner edge rotates in a direction extending in the longitudinal direction along the corner edge from the front cutting edge, its direction of rotation changes, and it joins the side cutting edge.

Abstract: A cutting tool having a high oxidation resistance, a high wear resistance and a good defect resistance. The cutting tool comprises a base body and a coating layer, the coating layer comprising TiaAlbMd(C1-xNx), M being selected as at least one member selected from among Si, W, Nb, Mo, Ta, Hf, Cr, Zr and Y; and a, b, d and x satisfy the following requirements: 0.35?a?0.55, 0.3?b?0.6, 0?d?0.25, a+b+d=1 and 0?x?1. The Al content of a droplet on the coating layer of a cutting face is higher than the Al content of the composition of the coating layer, and the Ti content of a droplet on a flank face is higher than the Ti content of the composition of the coating layer.

Abstract: A cutting tool with excellent resistance to adhesion and wear. The cutting tool has a cutting edge on the intersecting ridge line of the rake face and the flank face, and is covered on the surface of the base thereof by a coating layer comprising TiaAlbNbdMe(C1-xNx). M is at least one selected from Si, W, Mo, Ta, Hf, Cr, Zr, and Y, with the content ranges 0.3?a?0.8, 0?b?0.6, 0.01?d?0.25, 0?e?0.25, a+b+d+e=1, and 0?x?1). Droplets provided on the surface of the coating layer have a higher Nb content ratio on the rake face compared to the flank face.

Abstract: A cutting tool in which wear resistance is improved by suppressing sudden chipping on the flank face while suppressing oxidation of the coating layer on the rake face, and thereby has a long lifespan even under cutting conditions in which deposition and edge damage easily occur. In the cutting tool, a coating layer represented by Ti1-a-b-cAlaWbMc(C1-xNx), with M selected as at least one of silicon, yttrium, and a metal belonging to group 4, 5, or 6 on the periodic table, excluding titanium and tungsten, and 0.3?a?0.6, 0.01?b?0.2, 0?c?0.2, and 0?x?1, being provided on the surface of a main cutting tool body having a flank face and a rake face, and the content ratio of tungsten on the flank face is higher than the content ratio of tungsten on the rake face.

Abstract: A cutting insert is capable of boring or drilling without the formation of a prepared hole in a workpiece. A cutting edge includes a cutting edge portion extending from the outer peripheral side to the tool center axis side of a cutting tool body when the cutting insert is attached to a mounting seat, reaching a first plane including the tool center axis, and traversing from one side to the other side of a second plane which is perpendicular to the first plane and which includes the tool center axis.

Abstract: A cutting insert has a cutting edge configured to suppress an increase in cutting resistance applied to a cutting boundary portion with an increase in a depth of cut. The cutting insert has a rake face, a flank, and a cutting edge formed at an intersection portion between the rake face and the flank and is removably attachable to a mounting seat. The cutting edge has an angle decreasing portion in which a cutting edge angle gradually decreases in a direction in which the depth of cut of the cutting edge increases. In one embodiment, the rake face includes an upper rake face and a lower rake face. The flank is formed on a side surface between the top and bottom surfaces. The cutting edge is formed at an intersection portion between the upper rake face and the flank.

Abstract: Wear resistance and chipping resistance are both highly established for a surface-coated cutting tool. The surface-coated cutting tool of the present invention includes a base material and a coat film formed on the base material. A first coat layer at a chamfer portion has residual stress that exhibits a minimal value at a depth A within 2 ?m from the surface, and that is greater than or equal to ?7 GPa and less than or equal to ?1 GPa.

Abstract: In a cutting insert, a cutting edge is formed on a peripheral border of a rake face; a protruding section is formed on the rake face; a pair of convex sections is formed so as to extend toward the cutting edge; the convex sections face toward a corner portion; the convex sections include first wall surfaces and second wall surfaces; the first wall surfaces and the second wall surfaces are inclined surfaces that are inclined toward the rake face as those are farther from ridgelines intersecting with each other; and the intersection ridgelines intersect with a wall surface of the protruding section, at a position lower than a top portion of the protruding section in the corner portion side.

Abstract: A cutting insert includes upper, a lower, and side surfaces a corner cutting edge and a first cutting edge; a rake surface; and a protruding portion. The protruding portion is located inner side on the upper surface with respect to the rake face and comprises a first surface, a second surface, and a third surface located between the first surface and the second surface. The rake face includes a first rake face and a second rake face. An angle between an intersection line of the third surface and the second rake face and the first side is 90 degree or less as viewed from the upper surface.

Abstract: A cutting tool having excellent chip treatability and adhesion resistance is provided. The cutting tool includes a hard sintered body in at least a cutting edge and has a rake face and a flank face. The rake face has a chip breaker in a protruded or uneven shape. The hard sintered body contains at least 20% by volume of cubic boron nitride. A region of not more than 20 ?m from a surface of the hard sintered body on the rake face side includes A-structures made of cubic boron nitride and B-structures made of at least one selected from the group consisting of hexagonal boron nitride, amorphous boron nitride, and boron oxide. The volume ratio of the B-structures to the sum of the A-structures and B-structures, B/(A+B), is not less than 5% by volume and not more than 90% by volume.