Abstract: A reversible cutting insert for milling including opposing and identically or substantially identically top and bottom surfaces interconnected by a continuous peripheral side surface, with a median plane located between the top and bottom surfaces and intersecting the side surface, and an insert axis perpendicular to the median plane about which the cutting insert is indexable. Each top and bottom surface is limited by a circumferential cutting edge intersecting the side surface, the circumferential cutting edge in a top view having the shape of a truncated equilateral triangle. Each circumferential cutting edge includes three analogous sets of cutting edges exhibiting three-fold rotational symmetry about the insert axis. A first cutting edge portion intersects a first support plane.

Abstract: A machining process includes providing a cutting tool having a rake face and a flank face; bringing the cutting tool into contact with a metal alloy work piece to form a chip by penetrating the cutting tool into the workpiece; and introducing a nanofluid into a vicinity of the penetration to remove heat and, in some instances, customize the finished surface. The nanofluid includes a mixture of a cryo-liquid and nanoparticles having a maximum size of approximately 0.1 nanometers to approximately 100 nanometers.

Abstract: A contoured rake face cutting tool and method of making is disclosed. A rotary cutting tool with a plurality of teeth can cause damage to a work piece during cutting. By orienting the cutting angle of the teeth relative to the rotational central axis to high shear angle such as 50 or 70 degrees, the tool creates a high compression cut which is cleaner and less damaging to the work piece. The cutting surface itself is profiled, i.e. non-planar, such as concave or convex or other non planar shape, which is preferably formed into an ultra-hard material which is supplied for use in a planar form.

Abstract: A toolholder includes a pocket assembly having a nest section and a clamp section. An inverted nest is mounted in the nest section and includes an insert-receiving pocket for accommodating a cutting insert mounted therein. A clamping wedge is mounted in the clamp section in such a way that the cutting insert engages the clamping wedge. The inverted nest includes one or more coolant grooves that cooperate with the cutting insert for directing super critical carbon dioxide to a cutting tool/workpiece interface.

Abstract: A cutting insert for machining has a substantially cylindrical main body with an axis, a lateral flank and opposing rake faces. Cutting edges are formed at the intersection of the flank and rake faces. The cutting edges have, in the direction of the axis, in each case at least two convexly curved sections which are connected together by concavely curved or substantially straight sections.

Abstract: A turning tool holder includes a tool body, a cutting tool insert, and a shim. A coolant conduit system extends through the turning tool holder, a first portion of the coolant conduit system extending through the tool body and an end portion of the coolant conduit system extending through the shim. The end portion of the coolant conduit system includes a through hole extending from a first surface to an opposite second surface of the shim. The end portion has a coolant outlet opening at the second surface, the coolant outlet opening being formed by the shim alone. A jet of coolant from the coolant outlet opening may be directed towards a space expected to have a cutting zone of a workpiece. Further a cutting tool insert arranged to be used in a turning tool holder is disclosed.

Abstract: A cutting tool insert includes eight identical cutting edges. Each separate cutting edge has a first cutting edge portion and a second cutting edge portion. A corner angle between the first cutting edge portion and the second cutting edge portion is within a range of 75 to <90 degrees. The first cutting edge portion and the second cutting edge portion have substantially the same length to provide a substantially equal cutting depth. As seen along the center axis of the insert a first angle within a range of 14+/?9 degrees is formed between a first imaginary line extending from the center axis to a corner point at the first side surface and a second imaginary line extending from the center axis to an adjacent corner point at the second side surface. A cutting tool insert holder is also disclosed.

Abstract: 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.

Abstract: A cutting insert and an indexable insert-type cutting tool includes a cutting edge (6A) formed on each of a pair of side ridge portions of at least one of the side faces, wherein an insert main body (1) is formed in the shape of having front-back inversion symmetry which is 180° rotationally symmetrical with respect to a line of symmetry (N) passing through the center of the side faces; a flank face adjacent to the cutting edge (6A) is formed on the side face in the vicinity of each of the pair of polygonal faces (2); each of the flank faces is formed in the shape of a twisted face; the pair of side ridge portions on which the cutting edge (6A) is formed intersect each other in such a manner that the second corner portion (B) of one side ridge portion protrudes outside the other side ridge portion.

Abstract: A method for designing a cutting edge of a cutting element configured for removing material from a workpiece to leave therein a desired end profile (B22,B24,B26). The method comprises the steps of modeling a desired end profile (B22,B24,B26) of the workpiece, the profile having a longitudinal axis and being defined by a bottom surface (B12), a side surface (B16) and an adjustment surface (B14) extending therebetween; defining a lead profile plane (RP1) and an trail profile plane (RPT) spaced therefrom, each of the planes being oriented perpendicular to the longitudinal axis; determining a profile contour defined by the intersection line between the end profile (B22,B24,B26) and the lead profile plane (RPL).

Abstract: A tool for cyclo-palloid gear hobbing includes a head and a plurality of milling inserts protruding from a front side thereof. The milling inserts are mounted, two by two, in chip removal units that are detachably connected to the head. Each milling insert is clamped by a wedge and a screw that are easy to access. The wedge acts tangentially against the milling insert behind which there is a tangential support in the form of a shoulder. By clamping the milling insert with a respective wedge the milling inserts can be mounted and dismounted in a simple way, and each group of wedge+milling insert+tangential support can be located tangentially and thereby efficiently carry the cutting forces acting on the milling insert. In further aspects, an insert holder intended for the tool, a chip removal unit of an insert holder and an insert kit are disclosed.

Abstract: A cutting insert that has, in an upper surface, a convex portion including a main portion having a flat upper end surface, a first portion projecting from the main portion to a corner portion of the upper surface, a second portion projecting from the first portion to the corner portion, and a third portion projecting from the second portion to the corner portion. Upper end heights of the second portion and the third portion are fixed toward the corner portion, respectively. The first portion and the second portion are connected by a first flat inclined wall surface, the second portion and the third portion are connected by a second wall surface of a convex curved surface, and a front end of the third portion and the breaker groove are connected by a third wall surface of a convex curved surface.

Abstract: A cutting insert according to one aspect of the present invention includes a polygonal columnar shape, and includes an upper surface, a lower surface and a side surface located between the upper surface and the lower surface, and a cutting edge is formed at an intersecting portion between the upper surface and the side surface, the upper surface includes a main portion of a convex shape including a flat upper end surface, a first projecting portion which projects from the main portion to a corner portion of the upper surface, and a pair of second projecting portions which each project from the first projecting portion to a periphery of the upper surface to interpose a region between a front end of the first projecting portion and the corner portion, and each of upper ends of the pair of second projecting portions is spaced part from the first projecting portion.

Abstract: A cutting tool including a cutting insert for which corner changing can be performed, the cutting tool having a large number of usable corners and thereby being cost effective, reducing cutting force during machining, and ensuring high rigidity. A negative-type cutting insert having a regular polygonal shape with five to eight corners is attached to an end of a tool holder such that one of two adjacent sides of an outer peripheral surface serves as a rake face having a negative rake angle, the other of the two adjacent sides serves as a front flank face, a ridge between the two adjacent sides of the outer peripheral surface serves as an end cutting edge, and a ridge between the side that serves as the rake face and one of top and bottom surfaces serves as a side cutting edge, and such that corner changing can be performed.

Abstract: A cutting tool including an annular cutter body having at least one V-shaped pocket formed therein and a cutting tool cartridge configured to be received in the at least one pocket of the cutter body. The cutting tool cartridge including a main body. The main body includes a cutting head having a cutting chip control portion and a pocket configured to receive a cutting insert.

Abstract: A mechanical clamping tool holder for indexable inserts includes a tool holder body and complementary clamping mechanisms. The tool holder body accommodates several novel clamping mechanism types as well as other common clamping mechanisms. The tool holder body includes an insert pocket, and a complementary clamp pocket to assemble several clamping mechanisms that engage and clamp the inserts in the working position. The insert receiving pocket also includes a threaded bore to secure the shim seat and the clamp pocket includes a threaded bore for securing the clamping mechanisms.

Abstract: A cutting insert comprises an upper surface including a first corner, and a second and third corner, respectively, adjacent to both sides of the first corner. The upper surface sequentially includes a rake surface along an upper cutting edge, inclined toward a lower surface, going inward from the upper cutting edge at a rake angle on a basis of a perpendicular plane perpendicular to a central axis extending between the upper and lower surfaces, and a connection surface more inward than the rake surface, inclined toward the lower surface, going inward at a connection angle on the basis of the perpendicular plane. An intersecting part of the rake surface and the connection surface includes a highest position in a portion of the intersecting part corresponding to a minor rake surface. A cutting tool with cutting insert, and a method of producing a machined product using the cutting tool are provided.

Abstract: In a cutting insert according to an embodiment of the present invention, an upper surface includes: a first concave groove which is continuous with a first cutting edge and extends along a longitudinal direction; a pair of second concave grooves which are respectively continuous with a pair of second cutting edges and extend along the longitudinal direction; and a pair of protruded parts respectively located between the first concave groove and the pair of second concave grooves. The pair of protruded parts are respectively continuous with an end surface cutting edge and are separated from each other by a larger distance therebetween as separating from the end surface cutting edge. A cutting tool with the cutting insert, and a method of manufacturing a machined product by using the cutting tool are also provided.

Abstract: In a cutting tool having an indexable cutting insert with three cutting portions, the cutting insert is removably securable to an insert holder by means of a fastener. The cutting insert has two opposing end surfaces with a peripheral side surface extending therebetween. At least one end surface has a central boss protruding therefrom with a raised support surface, and the peripheral side surface has three abutment recesses. In an end view of the cutting insert, each of the three abutment recesses is visible and located inside a first imaginary circle circumscribing the visible central boss. A holding portion of the insert holder has a seating surface with at least one protuberance protruding therefrom. The support surface is in clamping contact with the seating surface, and exactly two of the three abutment recesses are engaged with the at least one protuberance.

Abstract: A cutting tool includes a cutting insert releasably retained therein. The cutting insert has top and bottom surfaces and a peripheral surface extending therebetween. The cutting insert does not include any clamping bore for receiving a clamping component therein. The cutting insert may having unitary, one-piece construction and be formed of a superabrasive material. The cutting insert may have a two-headed arrow shape, or similar shapes, such that the body of the cutting insert is small relative to the cutting regions thereof. The cutting tool includes a top clamp for clamping the cutting insert in an insert pocket. The top clamp has an asymmetrical shape and engages the cutting insert in one engagement region on the top surface, and in one engagement region on the peripheral surface. The cutting insert engages the insert pocket at the bottom surface, and in three spaced apart engagement regions on the peripheral surface.

Abstract: A cutting tool including an insert and a holder to which the insert is secured. The insert has a rod with a substantially circular transverse cross-section. The insert includes a shank portion and a cutting edge portion. The cutting edge portion is located at an end portion continuous with the shank portion. In the cutting edge portion, one end of a cutting edge ridge protrudes toward the periphery of the rod. When the insert is secured to the holder, the cutting edge ridge has a negative radial rake angle.

Abstract: In a cutting insert according to an embodiment, an upper cutting edge includes, sequentially from a first corner to a second corner, a corner cutting edge, a minor cutting edge inclined as separating from the corner cutting edge at a first inclination angle on a basis of a vertical plane perpendicular to a central axis extending between upper and lower surfaces, and a major cutting edge inclined as separating from the minor cutting edge at a second inclination angle on the basis of the vertical plane so as to become more closer to the lower surface than the minor cutting edge. A cross section of a rake surface obtained by cutting an inwardly located end portion thereof along a direction of the central axis has a straight line shape or concave shape in a region crossing over at least a minor rake surface and a major rake surface.

Abstract: An indexable cutting insert has mutually perpendicular longitudinal, lateral and vertical axes. The insert includes two opposite cutting portions and a clamping portion therebetween, arranged parallel to the longitudinal axis. Each cutting portion includes a rake surface and front and side relief flanks, and a cutting edge formed at an intersection of the rake surface and front relief flank. A second width of the clamping portion is greater than the first width of the cutting edges. The clamping portion has two resilient beams and a flexibility aperture opening out to side abutment surfaces of the clamping portion, allowing elastic deformation of the insert along the vertical axis. The cutting insert may further include two opposite stopper portions, each formed on a respective insert end surfaces, each stopper portion forming a step in the respective insert end surface. A cutting tool clamps one or more inserts at their clamping portions.

Abstract: A turning tool for internal machining has a spiral groove at a head section entering an inside of a workpiece. The turning tool includes a tool body, which has a head section and a shank section extending from the head section, and a cutting insert. The head section includes the following: a flat portion extending from a front end of the head section, which enters the inside of a workpiece, toward the shank section; an insert pocket formed at an edge of the flat portion as offset from a central axis of the tool body; and a chip flute extending from a proximity of the insert pocket toward the shank section across the central axis of the tool body and including a spiral curved surface on a peripheral surface of the head section. The cutting insert is replaceably mounted to the insert pocket.

Abstract: A cutting insert includes: a polygonal shaped upper surface; a lower surface; a side surface connected to each of the upper and lower surfaces; and an upper cutting edge located at the intersection of the upper surface and the side surface. The upper surface alternately includes three major corners and three minor corners. The upper cutting edge includes: a corner cutting edge; a minor cutting edge inclined toward the lower surface as separating from the corner cutting edge at a first inclination angle; and a major cutting edge inclined toward the lower surface as separating from the minor cutting edge at a second inclination angle. The corner cutting edge, the minor cutting edge and the major cutting edge are located sequentially from a first major corner to each of first and second minor corners, both of which are adjacent to the first major corner.

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: 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: In a cutting tool used for internal machining operations, a cutting insert with a single cutting portion is removably secured to an insert holder. The cutting insert has two opposing end surfaces, and an insert peripheral surface extending therebetween having three spaced apart abutment surfaces. The insert holder has a holder portion with a holder peripheral surface and an adjacent seating surface. At least one protuberance having four spaced apart reaction surfaces protrudes from the seating surface. The cutting insert is securable to the holding portion in left-hand and right-hand assembly positions, with the three abutment surfaces in clamping contact with three of the four reaction surfaces. In the left-hand assembly position, a first end surface is in clamping contact with the seating surface, and in the right-hand assembly position, a second end surface is in clamping contact with the seating surface.

Abstract: A cutting tool is described comprising a cutting insert with an upper surface, a lower surface, a side surface, and a cutting blade formed at the intersection of the upper surface and the side surface, and a holder comprising an insert pocket to which the cutting insert is attached. The cutting insert is attached to the holder in such a manner that the cutting blade projects outward from the front end surface and the outer peripheral surface of the holder. The holder comprises in the outer peripheral surface on a rear end side with respect to the cutting blade a concave curve-shaped first wall surface portion that extends from the vicinity of the insert pocket toward the rear end side. The lower end of the front-end-side edge of the first wall surface portion is disposed at a lower position than the cutting blade.

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 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 insert according to an aspect of the present invention is provided with two opposite first surfaces, and a peripheral surface extending between the two first surfaces. A first cutting edge is formed on an edge of one first surface of the two first surfaces. A rake surface associated with the first cutting edge extends on the one first surface. A second cutting edge is formed on an edge of one second surface of two opposite second surfaces in the peripheral surface. A rake surface associated with the second cutting edge extends on the one second surface. The second cutting edge has a different function from the first cutting edge.

Abstract: A cutting edge exchange type cutting tool includes a cutting insert and a body having a chip seat to which the cutting insert is attached. The cutting insert has a first inclined surface part and a second inclined surface part. In the first wall surface, a first abutting part which abuts on the first inclined surface part is formed. In the second wall surface, a second abutting part which abuts on the second inclined surface part is formed. The first and second inclined surface parts are formed with flat surfaces. The first inclined surface part is inclined at an obtuse angle to the bottom surface. The second inclined surface part is inclined at an acute angle to the bottom surface.

Abstract: A cutting insert is provided with a plurality of cutting portions formed at the intersection portion of each end surface and a peripheral surface. Each cutting portion includes first and second cutting edges. First corners and second corners which differ in their internal angles are alternately formed in each end surface. An internal angle of the first corner is smaller than an internal angle of the second corner. Each first cutting edge has a portion extending to approach the median plane as a distance from a corresponding first corner increases. A first side surface portion extending on the peripheral surface from each first cutting edge forms an insert internal obtuse angle, and a second side surface portion extending on the peripheral surface from each second cutting edge forms an insert internal acute angle.

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: 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: A cutting insert helps prevent the occurrence of burrs and enables highly efficient processing. The cutting edge of the insert includes a cutting corner portion, a first main cutting edge and a second main cutting edge. The second main cutting edge includes a descending inclination portion inclined toward the side of a surface facing the rake face as it separates from the cutting corner portion and an ascending inclination portion inclined toward the side of the surface on which the rake face is formed, as it separates from the cutting corner portion. The descending inclination portion is connected to the cutting corner portion, the ascending inclination portion is connected to the descending inclination portion, and at least a connection region between the ascending inclination portion and the descending inclination portion has a concave curved non-cutting recess portion.

Abstract: An insert according to an embodiment of the present invention includes an upper surface, a lower surface, a side surface which is connected to the upper surface and the lower surface, and includes a first side surface, and a cutting edge which is located an intersection of the upper surface and the side surface, and comprises a first cutting edge corresponding to the first side surface. The first cutting edge has a projected shape projected toward the upper surface in a side view, and has a recessed shape recessed inward in a top view. A cutting tool according to an embodiment of the present invention includes the insert and a holder configured to attach the insert thereto so that at least a part of the first cutting edge has a negative axial rake angle. A method of manufacturing a machined product according to an embodiment of the present invention is a method of manufacturing the machined product by using the cutting tool.

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 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 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: A grooving insert comprising a cutting edge (16) extending over the width (B) of the insert (10), a main flank (18) and a rake face (14) and also a supporting side (20) opposite the rake face (14) is characterized in that the grooving insert has a substantially cube-shaped outer contour and consists of two geometrically identical cube halves merging into one another in a parting plane, wherein each cube half has a separate cutting edge and the cube halves lie so as to be rotated by 90° relative to one another and turned by 180° relative to one another.

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 element for use in a cutting operation, comprising a cutting edge (CE) capable of cutting out material from a workpiece during the operation, to form therein a workpiece corner of angle alpha. There exists at least one view of the cutting edge in which a portion of the cutting edge is delimitable by a first (L1) and a second (L2) line oriented tangentially to the portion of the cutting edge portion at respective tangency points A and B. The lines form therebetween a cutting angle corresponding to the workpiece corner angle alpha and have a vertex 0. For a bisector of the cutting angle intersecting the portion of the cutting edge at the point C, the projection C of the point C of the portion of the cutting edge on a line OL passing through the vertex 0 perpendicularly to the plane of the one view is located between projections A1 and B? of the respective points A and B of the portion of the cutting edge on the line OL.

Abstract: In a cutting tool having an indexable cutting insert with four cutting portions, the cutting insert is securable within a holder portion in four index positions by means of a fastener. The cutting insert has two opposing end surfaces with a peripheral side surface and a central axis extending therebetween, the peripheral side surface having exactly four abutment zones. The insert holder has a holder portion and a body portion, the holder portion having a sidewall surface with a first, second and third reaction zone. The cutting insert is divided into four imaginary quadrants about its central axis and the four abutment zones are located entirely in two of the four imaginary quadrants, and for each index position, three of the four abutment zones are in clamping contact with the three reaction zones.

Abstract: A superhard insert for a machine tool, comprising a superhard cutter structure 20 defining a rake face 22, a flank 24 and a rounded cutting edge 26 formed by the transition between the rake face 22 and the flank 24; the flank 24 comprising a convex arcuate surface portion 28 extending away from the cutting edge 26, the arcuate surface portion 28 having a radius of curvature R2.

Abstract: A cutting tool has an indexable insert, a holder with a holder member and an arrangement for securing the insert to the holder. An upstanding holder wall and a conical insert clearance surface are designed so as to enable securing of the insert to the holder in a finite number of fixed relative positions. A curved portion of the upstanding holder wall supports the conical clearance surface laterally in each fixed relative position of the holder and the insert. A tight abutment of the conical clearance surface on said curved portion is provided to dirt from penetrating therebetween.

Abstract: A cutting insert having 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 (4) connected to the upper surface (2) and the lower surface (3), and a cutting edge (5) which is located at an intersection of the upper surface (2) and the side surface (4), and includes a major cutting edge (51) and a flat cutting edge (52). The major cutting edge (51) includes a major cutting section (512) which has a concave shape and is inclined downward as a straight line connecting both ends thereof is away from the flat cutting edge (52) in a side view. A cutting tool (11) according to an embodiment of the present invention includes the cutting insert (1) and a holder (10) configured to attach the cutting insert (1) thereto.

Abstract: The present invention relates to a cutting tool capable of both drilling and internal/external turning. The cutting tool comprises a generally triangular-shaped cutting insert and a tool holder. On each side, the triangular-shaped cutting insert forms a major cutting edge and a minor cutting edge, which is shorter than said major cutting edge. Two adjacent major cutting edges form an angle of 60° therebetween, while adjacent major and minor cutting edges intersecting at a corner of the triangular shape of the cutting insert form an angle of 80 to 89° therebetween. The cutting insert is mounted in a pocket so that one of the major cutting edges of the cutting insert is projected in an axially forward direction of the tool holder, while the minor cutting edge on the side adjacent to the projected major cutting edge is projected in a radially outward direction of the tool holder.

Abstract: An interchangeable tool part for a reamer includes a hard metal cutting plate. The cutting surface of the cutting plate is arranged at a distance of at least 0.02 mm from the cutting edge on one side in the region of the cut part and at least partially has a peak-to-valley height which increases by at least 0.01 mm in order to assure the production of cut fragments in the main cutting area and to prevent a build up of cuts in the region of auxiliary cutting section and/or to simplify the removal of cuts. Also high targets can be reached by virtue of the fact that the cutting plates define at least one cutting cavity in the cutting surface thereof at a distance of at least 0.02 mm from the main cutting edge on the end side in the region of the entry angle.