Abstract:
An indexable insert for application to turning of a cast iron product, including a first minor cutting edge 21 having a radius Ra and a second minor cutting edge 22 having a radius Rb successively provided between an arcuate nose cutting-edge 12 having a nose radius R and a linear cutting edge 16 so as to extend from the nose tip to the linear cutting edge 16. At a connection point P1 between the arcs assumed by the cutting edges 12 and 21, a smaller intersectional angle &thgr;x of a tangent T12 and a tangent T21 to the respective arcs is 1° or less. Also, at a connection point P2 between the arcs assumed by the cutting edges 21 and 22, a smaller intersectional angle &thgr;y of the tangent T21 and a tangent T22 to the respective arcs is 1° or less. The radii R, Ra, and Rb are set to the dimensional relationships “Ra>R, Ra falls within a range of 3 mm to 20 mm, and Rb≧1.5Ra.”
Abstract:
In a method of making a hard sintered body indexable insert, respective hard sintered bodies used as cutting edges are brazed to seating grooves at corners of the upper and lower surfaces of a tool substrate. A brazing alloy that contains Cu and 0.5 to 65 wt % Ti and/or Zr and inevitable impurities first temporarily bonds and fixes the sintered bodies in the seating grooves by evaporating a solvent component of the brazing alloy. Then, the sintered bodies are brazed and permanently fixed to the tool substrate by heating it in a vacuum or in an inert gas atmosphere. The thickness of the tool substrate remaining between the upper and lower seating grooves is preferably 30% to 90% of the entire thickness of the hard sintered body indexable insert, and the cutting-edge length of the hard sintered body is preferably 0.5 mm to 4 mm.
Abstract:
A non-rotary cutting tool which is to be moved relative to a workpiece in a predetermined direction for cutting the workpiece, with its rake face being held substantially perpendicular to the predetermined direction. The cutting tool includes (a) a generally cylindrical shank portion, and (b) a generally semi-cylindrical body portion which has an outer circumferential surface constituted by the rake face and a semi-cylindrical surface. The semi-cylindrical body portion has a cutting edge which is defined by an edge of the rake face and which is covered with a diamond coating. Also disclosed is a process of machining a scroll member of a scroll compressor by using this non-rotary cutting tool.
Abstract:
A processing apparatus is provided with a diamond tool. When a first edge portion is made as X axis, a tip end peak point of a rake face is made as an intercept (0, y) on Y axis, and the rake face is projected in the first quadrant on an X-Y plane, a shape between an end portion of a first edge portion and an end portion of a second edge portion is asymmetric around a straight line which passes at the intercept and is parallel to X axis and the shape is shaped to be not a straight line such that Y value of a point on the shape increases as X value of the point increases.
Abstract:
A cutting insert comprises a rake face, a plurality of flank faces including clearance faces having a positive clearance angle. A cutting edge is formed at an intersection between the rake faces and the flank face and a convex wiper cutting edge formed on the cutting edge. A method for forming the cutting insert comprises the steps of placing a powdered material into a die and pressing the powdered material in the die to achieve a form having a convex portion on the rake face and at least one substantially flat clearance face having a positive clearance angle. Next, the form is removed from the die and sintered.
Abstract:
A cutting insert, intended for chip removing machining includes a cutting geometry surface having a cutting edge from which extends a primary chamfer that transforms into a chip removing surface. The chip removing surface is inclined in a inwards/downwards direction in order to permit sinking of a chip being formed, and transforms into a deflection surface arranged to initiate deflection of the chip from the cutting insert. The angle of inclination of the chip removing surface does not exceed 18°. The level difference in elevation between the primary chamfer and the chip deflection surface amounts to maximally 0.20 mm.
Abstract:
An indexable turning insert has main upper and lower surfaces of polygonal shape joined by side surfaces. Insert corners are defined by the intersection of insert sides at each corner of the polygonal surfaces, insert corners having a curve of relatively small radius defining the nose of the corner. The inserts are at least partially symmetrical and have a plurality of identical cutting edges. Adjacent the corner nose of an identical cutting edge are wiping surfaces comprising at least one curved segment joining the insert corner radius and defined by a radius larger than the corner radius and at least one flat segment intersecting the insert side at a shallow angle.
Abstract:
An indexable insert for metal cutting having an upper surface, a bottom surface and side surfaces. At least a portion of the intersecting lines between the side surfaces and the upper surface generates a main cutting edge, a secondary cutting edge and a corner cutting edge. The corner portions of the upper side are provided with recesses. The corner cutting edge including at least two radiused edges having different radii. The first radiused edge, having a larger radius, being located adjacent to the main cutting edge and a second radiused edge, having a smaller radius, being located adjacent to the secondary cutting edge. Furthermore, the secondary cutting edge includes a radiused edge having a larger radius than the two aforementioned corner radiused edges and the recess includes a rear plane being so arranged that the chips hit a rear plane of the upper surface and break against the rear plane.
Abstract:
A metal cutting insert for use in turning or drilling operations and having a rake surface and a pair of relief flanks merging in a nose of radius r and defining with the rake surface a pair of cutting edges; each cutting edge having a first portion of length 1 tangential with the corner, the first portion enclosing an angle .epsilon. and a second subsequent portion defining between them an angle .beta.; a chip former groove being formed in the rake surface adjacent the cutting edges and the nose. The cutting edge is positive in the region of the nose and the first portions and the chip former groove adjacent thereto have a first portion which slopes towards a base of the insert, any chip deflecting portion thereof being sufficiently spaced from the cutting edge to allow for chips to have reached a desired minimal length prior to their deflection.
Abstract:
A cutting tool comprised of a polycrystalline layer of diamond or cubic boron nitride integrally adhered to a recessed edge portion of a cemented carbide substrate structure, said layer having a tool nose of a given radius joining two substantially straight cutting edges, a face of said layer being adhered to the bottom surface of the recessed portion and a round side of the layer being adhered to the wall of the recessed portion, the thickness of the polycrystalline layer and the height of the wall being substantially equivalent.