Abstract: A cutting insert has a first cutting edge provided with a chip breaker suitable for cutting an outermost region of a hole. The cutting insert has a substantially polygonal upper face, a substantially polygonal lower face, and a plurality of side faces extending between the upper face and the lower face. The plurality of side faces include a main side face constituting a flank of a linear cutting edge and a sub side face constituting a flank of a corner cutting edge; the main side face has a relief angle of 0°, the sub side face has a relief angle larger than 0°. A second cutting edge is further provided at an intersection portion between the main side face and the lower face.

Abstract: A guide pad with high flexibility of arrangement is provided. The guide pad in a plate-like shape is provided, including an upper surface and a lower surface which face each other, and a side surface extending between the upper surface and the lower surface, and being removably attached to a tool body of a cutting tool, in which the upper surface includes at least one guide surface that extends in a longitudinal direction of the guide pad and curves convexly, and the upper surface and the lower surface have left-right asymmetrical external shapes, respectively.

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: An upper surface of a cutting insert includes a first rake face and a second seating surface. A lower surface of the cutting insert includes a second rake face and a first seating surface. The cutting edge includes a first cutting edge portion formed at a crossing edge line portion between the first rake face and a flank face and a second cutting edge portion formed at a crossing edge line portion between the second rake face and the flank face. The first cutting edge portion and the crossing edge line portion between the first seating surface and the flank face are positioned opposite each other. The second cutting edge portion and the crossing edge line portion between the second seating surface and the flank face are positioned opposite each other.

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 clamping device having a high clamping force and operability when a cutting insert is attached/detached is provided. The clamping device has a guide hole, a screw hole, a clamp member having a clamp portion and arranged movably in the guide hole, and a screw member screwed with the screw hole and movable in first and second directions, wherein the screw member can be engaged with the clamp member in movement both in the directions and the guide hole has a first cam surface engaged with the clamp member and converting a force in the first direction received from the screw member into a force for moving the clamp member in a direction toward the cutting insert and a second cam surface converting a force in the second direction into a force for moving the clamp portion in a direction away from the cutting insert.

Abstract: A cutting insert includes a first end surface, a second end surface located opposite the first end surface and an axis extending so as to penetrate the first end surface and the second end surface. The insert includes two first cutting edges with a curve shape on a first end surface side and two second cutting edges with a curve shape on a second end surface side. Each of the first cutting edges is formed on an intersecting ridge portion between the first end surface and a corresponding side surface portion so as to curve on a plane orthogonal to the axis. Each of the second cutting edges is formed on an intersecting ridge portion between the second end surface and the corresponding side surface portion so as to curve on a plane orthogonal to the axis.

Abstract: A guide pad with a high freedom degree of arrangement is provided. A plate-shaped guide pad includes top and bottom surfaces, and a side surface that extends between the top surface and the bottom surface, and is removably attached to a tool body of a cutting tool. The side surface has at least one guide 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 can be clamped by a lever-lock clamping device to a tool body in a more stable and reliable manner. A cutting insert clamped by the clamping device to an insert seat formed on a tool body, includes: an upper surface and a lower surface each having a substantially polygonal contour shape; a plurality of side surfaces extending between the upper surface and the lower surface; a through-hole penetrating through the upper surface and the lower surface; and a concave notch portion for receiving a clamping force that is partially formed at a peripheral edge portion of the through-hole on the upper surface side.

Abstract: A threading cutting insert achieves high shape accuracy of a screw to be processed, and saves on manufacturing cost. Therefore in the threading cutting insert, a plurality of tooth-shaped cutting edges are formed in a cross ridge line portion between a rake face and flanks formed in a cutting side face, wherein the plurality of mountain-shaped cutting edges provides at least one finishing cutting edge for transferring a shape of a screw, and at least one roughing cutting edge formed in a tooth shape smaller than that of the finishing cutting edge. A flank of the finishing cutting edge includes a first flank, and a second flank having a clearance angle larger than that of the first flank, wherein the finishing cutting edge, the first flank, and the second flank are sequentially provided in that order from the rake surface in a direction of a lower surface of the insert.

Abstract: A cutting insert is suitable for pocket machining. The cutting insert (10) includes a rake face (14); a flank (15); and a main cutting edge (11) formed in an intersecting portion between the rake face (14) and the flank (15) and extending in a direction intersecting a cutting direction of a milling tool. The main cutting edge includes at least one separating portion (12) not involved in cutting, in the middle of the main cutting edge (11) in a direction along the main cutting edge (11). The main cutting edge (11) is formed of at least two cutting edges (11a, 11b) separated by the separating portion (12), and when the cutting insert is attached to a tool body (1) of the cutting tool, cutting edge angles ?1 and ?2 of the cutting edges (11a,11b) are set within a range from 5° or more to 20° or less.

Abstract: A cutting insert has an approximately polygonal plate shape with a cutting edge formed on a intersection portion between a rake face and a flank. A chip breaker is formed on the rake face, and a chip-breaker concave portion is defined by an inclined surface which is curved in a concave manner and which is smoothly connected to the bottom surface portion while being gradually inclined toward the bottom surface portion, from a peripheral edge portion on a nose portion side to a bottom surface portion.

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.