Patent application number | Description | Published |
20110070039 | Cutting Insert with Protrusions Formed at Corner Area Thereof - A cutting insert has an upper surface, a lower surface, a plurality of side surfaces connecting the upper surface and the lower surface and a central hole formed at a central portion thereof. The cutting insert has a flat seating surface formed on a highest level of the upper surface, a plurality of side cutting edge portions formed at intersections of the upper surface and the side surfaces, and a corner cutting edge portion formed at an intersection of two adjacent side cutting edge portions and having a cutting edge formed at a front end thereof. A land portion, a downward inclined surface, a corner bottom surface, a first protrusion, an upward inclined surface and the seating surface are formed on the corner cutting edge portion sequentially along a diagonal line directed from the cutting edge to the central hole. A pair of second protrusions are formed and disposed symmetrically on both sides of the diagonal line so that the corner bottom surface is surrounded by the downward inclined surface, the first protrusion, and the second protrusions, and the corner bottom surface has the smallest height and the seating surface has the largest height along the diagonal line. | 03-24-2011 |
20110070040 | Cutting Insert Having a Corner Recess - A cutting insert for a machining tool has a structure capable of effectively controlling chips generated on a work-piece. The cutting insert includes an upper surface, a lower surface, a plurality of side surfaces connecting the upper surface and the lower surface and a central hole formed at a central portion thereof. In the cutting insert, a seating surface is formed on a highest portion of the upper surface, a plurality of side cutting edge portions are formed at border portions of the upper surface and the side surfaces. Each side cutting edge portion has a side cutting edge formed at an upper end thereof and a corner cutting edge portion is formed at an intersection of two adjacent side cutting edge portions. The corner cutting edge portion has a cutting edge formed at a front end thereof, a land portion, a downward inclined surface, a corner bottom surface, a first upward inclined surface, a first protrusion, a second upward inclined surface, a second protrusion, an upward grooved surface and the seating surface sequentially formed along a diagonal line directed from the corner cutting edge toward the central hole. The corner bottom surface has the smallest height along the diagonal line. | 03-24-2011 |
20110164933 | CLAMPING DEVICE FOR A CUTTING INSERT - An insert clamp secures a cutting insert having a central hole to a tool holder. The clamp includes a forward protrusion to be received in the central hole of the insert, a central body portion provided with a pressing part to press down the upper surface of the insert and a screw hole for a clamping screw to pass through, and a rear protrusion having a rear contact surface to come in contact with a rearward slanting surface of the tool holder. The forward protrusion is formed on the forward end of the insert clamp, an inside surface of the forward protrusion extends downward in a spaced state apart from the inner wall of the central hole of the insert, and a distal portion of the inside surface the forward protrusion is provided with a protuberance of convex curved surface to come in tangential contact with the inner wall of the insert. The pressing part is formed on the bottom surface of the central body portion of the insert clamp, and has convex curved surfaces to come in tangential contact with the upper surface of the insert on both regions of the bottom surface of the central body portion which is bisected by a central line passing through the forward protrusion and the screw hole. | 07-07-2011 |
20110222974 | Cutting Insert Having Grooves Formed Between Adjacent Cutting Edges - A cutting insert has a structure by which a sufficient surface area is in contact with a tool holder and cutting fluid can be smoothly flowed. The cutting insert has an upper face, a lower face, a plurality of side faces connecting the upper face and the lower face and a through hole passing through the upper face and the lower face, the upper face being divided into a periphery region disposed adjacently to cutting edges formed by the upper face and the side faces, and a central protruded region disposed between the through hole and the periphery region and surrounding the through hole, the central protruded region being placed higher than the edges. The periphery region is formed along all the cutting edges and includes a descent face inclined downward from a given cutting edge to the central protruded region, a bottom face and an ascent face inclined upward from the bottom face to the central protruded region. A plurality of grooves are formed on the central protruded region of the upper face, each groove being formed such that both ends of the groove are directed to adjacent cutting edges. | 09-15-2011 |
20110274507 | Clamping Apparatus For Cutting Insert - A tool holder has an apparatus for clamping a cutting insert thereto. The tool holder has a cutting insert pocket and a mounting bore; a clamp lever including a clamp portion and a lever portion placed in the mounting bore; and a fixing screw. The fixing screw is fastened through a hole which extends downwardly from a side wall of the tool holder to the mounting bore. One end of the fixing screw further includes a pressure-applying surface substantially perpendicular to the rotational axis of the fixing screw, and the side surface of the lever portion of the clamp lever has an inclined surface which makes contact with the pressure-applying surface of the fixing screw. According to the clamping apparatus, the cutting insert can be firmly clamped to the tool holder. | 11-10-2011 |
20110305534 | Cutting Tool for Drilling and Turning - 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. | 12-15-2011 |
20120003053 | Tool Holder Clamp Assembly for Cutting Inserts and Its Pressing Plate - A clamp fastens a cutting insert to a tool holder. The clamp assembly includes a body portion provided with a screw hole, a forward protrusion formed at the front portion of the body and extending downward, a rear protrusion formed at the rear end portion of the body and extending downward, and a bridge connecting the forward protrusion and the central portion of the body. The clamp assembly also includes a pressing plate having upper and lower surfaces, a front nose portion, a rear end portion, and is provided with a keyhole shaped groove having an enlarged inner cavity open toward the rear end by a narrow neck extending thicknesswise. The forward protrusion is inserted into the enlarged inner cavity and the bridge is inserted into the narrow neck of the keyhole groove so that the pressing plate is coupled to the clamp. | 01-05-2012 |
20120114435 | Assembly of Double-Sided Indexable Cutting Insert and Reinforcing Part - An assembly includes a double-sided indexable cutting insert and a reinforcing part. The assembly can be used to process metallic materials and the like. The polygonal, double-sided indexable cutting insert of the present invention has a plurality of convex portions at each corner portion. The level of the convex portions is lower than that of the corner cutting edges. Further, the reinforcing part of the present invention has flat portions that come into contact with the convex portions of the cutting insert at each corner portion. When the cutting insert and the reinforcing part are assembled together, the flat portions of the reinforcing part contact at least three convex portions of the cutting insert. | 05-10-2012 |
20120294682 | CUTTING INSERT HAVING CHIP CONTROL SURFACE WITH OUTWARDLY FACING ARCUATE CORNER PROTRUSIONS - A hexahedral-shaped cutting insert has a concavely curved upper surface, a lower surface, a plurality of side surfaces connecting the two, and a central hole passing through the upper and lower surfaces. Cutting edges are formed at intersections between the upper surface and the side surfaces, and corner cutting edge portions are formed at borders of two adjacent cutting edges. Cutting edge height is largest at corner cutting edge portions and smallest in the middle portions. In an inward direction of the insert from a cutting edge, the upper surface has a land portion, a downward inclined surface, a bottom surface, and a seating surface portion. A plurality of semispherical protrusions are formed on border portions between the downward inclined surface and the bottom surface, and at least one corner cutting edge portion has a corner bottom surface surrounded by an outwardly facing arcuate protrusion connecting two adjacent semispherical protrusions. | 11-22-2012 |