Patents Assigned to Sandvik AB
  • Rock drill bit and method for hardening a rock drill bit
    Patent number: 5975223
    Abstract: The present invention relates to a rock drill bit for rotary crushing machining of rock. The rock drill bit includes legs (10), each of which carry a journal (11) provided with bearing surfaces (27, 28, 34) cooperating via bearing elements with bearing races in a rotatable roller provided with inserts or chisels. Each leg is made from a parent material with substantially homogeneous hardness and each leg comprises a leg tail (30) provided to resist entrance of drill cuttings into the bearings. The bearing surfaces (27, 28, 34) have higher wear resistance than the parent material and the leg tail (30) is at least partly of the same material condition as the bearing surfaces. The invention further relates to a method of manufacturing a rock drill bit.
    Type: Grant
    Filed: August 12, 1997
    Date of Patent: November 2, 1999
    Assignee: Sandvik AB
    Inventor: Lennart Karlsson
  • Milling cutting insert
    Patent number: 5971672
    Abstract: The present invention relates to a milling cutting insert having an upper side, a bottom side, and flank surfaces connecting the upper and bottom sides. At each operative cutting corner there is a projection which is depressed relative to the adjacent main cutting edge and corner cutting edge. At the front upper edge of the projection is the wiper edge that generates the surface on the workpiece. By tipping the cutting insert axially positively and radially negatively, the horizontally located wiper edge may be tipped frontwards into contact with the workpiece, while the vertically located wiper edge is tipped backwardly, so that it does not reach the workpiece. In this way an improved axial clearance is made possible and an undesired groove in the workpiece is avoided, which would otherwise be caused by the vertically located wiper edge.
    Type: Grant
    Filed: April 28, 1997
    Date of Patent: October 26, 1999
    Assignee: Sandvik AB
    Inventor: Lars-Ola Hansson
  • Shaft tool with detachable top
    Patent number: 5971670
    Abstract: A shaft tool for metal cutting machining, includes a cutting portion and a shaft portion. The cutting portion includes a fist part formed with a cutting edge, and a second part formed with an external screw thread. The first and second parts are of one-piece integral construction. The shaft portion includes an internal screw thread to which the external screw thread is removably secured.
    Type: Grant
    Filed: May 20, 1997
    Date of Patent: October 26, 1999
    Assignee: Sandvik AB
    Inventors: Goran Pantzar, Bjorn H.ang.kansson, Stefan Roman, Per-Anders Holmstrom
  • Oxide coated cutting tool with increased wear resistance and method of manufacture thereof
    Patent number: 5968595
    Abstract: An oxide coated cutting tool including a body coated with refractory single- or multilayers one of which consists of single-phase .kappa.-Al.sub.2 O.sub.3 characterized by controlled microstructure with crystal planes preferably grown in the (210)-direction with respect to the exposed sure of the coated body. The oxide coated cutting tool exhibits increased wear properties when machining ball bearing steel.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: October 19, 1999
    Assignee: Sandvik AB
    Inventor: .ANG.sa Kutscher
  • Grinding cup and wear part therefor
    Patent number: 5964649
    Abstract: A grinding cup includes a wear part having a cavity at its front end, the cavity configured for grinding a button of a rock drill bit. A flush channel extends forwardly through the wear part and terminates at the cavity for conducting a flushing medium thereto. The flush channel is spaced from a center axis of rotation of the grinding cup by a distance greater than 2% and less than 30% of a largest diameter of the cavity.
    Type: Grant
    Filed: August 11, 1997
    Date of Patent: October 12, 1999
    Assignee: Sandvik AB
    Inventors: Arne Bergqvist, Peter Nava
  • Drilling tool with internal cavities for chip removal
    Patent number: 5964553
    Abstract: A drilling tool includes a one-piece drill body having axially spaced front and rear ends. The front end includes pockets for receiving cutting inserts spaced by respective radial distances from a center axis of rotation of the drill body. Chip canals are formed in the front end, and a frustoconical chip space is formed in the drill body for connecting the chip canals to an axial passage which discharges chips through the rear end of the drill body.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: October 12, 1999
    Assignee: Sandvik AB
    Inventors: Torsten Blomberg, Lars Sandberg
  • Wear and thermal shock resistant SiAION cutting tool material
    Patent number: 5965471
    Abstract: A sintered ceramic material for high speed machining of heat resistant alloys is provided comprising SiAION grains and 0.2-20 v/o intergranular phase. At least 80 v/o of said SiAION phase is beta SiAION having a z-value greater than 1.0, but less than 1.5. The ceramic material has a Vickers Hardness HV1 of more than 1530 and it is produced by gas pressure sintering.
    Type: Grant
    Filed: March 17, 1997
    Date of Patent: October 12, 1999
    Assignee: Sandvik AB
    Inventor: Gunnar Brandt
  • Fine milling cutting insert
    Patent number: 5957629
    Abstract: A double-sided milling cutting insert has two parallel main surfaces which are turned 90.degree. relative to each other. Each main surface comprises four operative cutting corners. In each cutting corner there are two bevelled surfaces which are angled relative to the plane of the main surface. Four side surfaces are angled in order to make possible a positive cutting geometry.
    Type: Grant
    Filed: September 6, 1996
    Date of Patent: September 28, 1999
    Assignee: Sandvik AB
    Inventors: Ingemar Hessman, Stefan Roman
  • Diamond-coated button insert for drilling
    Patent number: 5950745
    Abstract: A button insert for a percussive drill bit comprises a carbide base and a diamond layer bonded thereto. The diamond layer forms a dome-shaped cutting surface which is of symmetrical configuration about a center axis of the insert. A crest portion of the cutting surface has a larger radius of curvature than a peripheral portion thereof. The cutting surface can be formed by numerous radii, or can be of constantly varying radius (i.e., elliptical).
    Type: Grant
    Filed: August 18, 1997
    Date of Patent: September 14, 1999
    Assignee: Sandvik AB
    Inventor: Karl Ingmarsson
  • Superconducting high strength stainless steel magnetic component
    Patent number: 5951788
    Abstract: A stainless steel alloy useful as a construction material in superconducting magnetic components, said alloy containing in weight percent 0.05-0.25% C, 0.1-1.5% Si, 3.5-7.5% Mn, 17-21% Cr, 6-10% Ni, 0.10-0.50% N, the remainder being Fe and normal impurities.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: September 14, 1999
    Assignee: Sandvik AB
    Inventor: H.ang.kan Holmberg
  • Whisker-reinforced ceramic cutting tool material
    Patent number: 5948715
    Abstract: Oxide-based ceramic cutting inserts for chipforming machining of steel, comprising a ceramic oxide-based matrix of alumina and less than 10% by volume zirconia and 5-40% by volume of homogeneously dispersed whiskers based upon (Ta.sub.x Hf.sub.y Ti.sub.1-x-y)C.sub.1-z N.sub.z where 0<x<0.75 and 0<y<0.75, x+y>0.25 and 0.ltoreq.z<1.
    Type: Grant
    Filed: June 16, 1998
    Date of Patent: September 7, 1999
    Assignee: Sandvik AB
    Inventors: Gunnar Brandt, Magnus Ekelund
  • Tool for coldforming operations
    Patent number: 5948523
    Abstract: An improved coldforming tool made of a zone in a tungsten carbide-cobalt cemented carbide is disclosed. The tool, preferably a wire drawing nib, contains WC with a mean grain size of 1.5-2 .mu.m and 5-7 weight % Co and with a carbon content close to saturation level and sufficient to exhibit cobalt magnetic measurements of 92%-98% of that of pure cobalt.
    Type: Grant
    Filed: July 17, 1997
    Date of Patent: September 7, 1999
    Assignee: Sandvik AB
    Inventors: Michael John Carpenter, Gary William Sweetman
  • Diamond enhanced rock drill bit for percussive drilling
    Patent number: 5947215
    Abstract: A rock drill bit for percussive drilling includes a steel body in which six gauge buttons and a single front button are mounted. The gauge buttons are arranged symmetrically and equally spaced about a central axis of the bit. The front button is arranged along the central axis. The front button is of larger diameter than the gauge button. At least three of the gauge buttons are diamond-enhanced, and the front button may be diamond-enhanced.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: September 7, 1999
    Assignee: Sandvik AB
    Inventor: Lars-Gunnar Lundell
  • Resilient, non-rotating seal for rock drill
    Patent number: 5944126
    Abstract: A rock drill bit includes at least one leg about which a roller cutter is rotatably mounted. A ring-shaped seal is disposed between an end surface of the leg and a sealing surface of the roller cutter. The seal is arranged coaxially with respect to an axis of rotation of the roller cutter and is formed of an elastic material and a relatively rigid material embedded within the elastic material. The elastic material defines first and second surfaces which engage the leg and the roller cutter, respectively. Either the leg or the seal includes circumferentially spaced recesses which receive respective projections formed in the other of the leg and the seal, for locking the seal to the leg against rotation relative thereto.
    Type: Grant
    Filed: October 8, 1997
    Date of Patent: August 31, 1999
    Assignee: Sandvik AB
    Inventor: Stig-.ANG.ke Brolund
  • Method for hardening selected regions of a guide bar for chain saws, and guide bar produced thereby
    Patent number: 5943782
    Abstract: A chain saw guide bar includes outer side surfaces, a longitudinal groove having side walls, and two edge surfaces. Each edge surface interconnects a side wall and an outer side surface to form therewith inner and outer corners, respectively. To edge-harden the guide bar, the edge surfaces, inner corners, and outer corners are heated above 750.degree. C. Then, the edge surfaces and inner corners are rapidly cooled, i.e, quenched, but the outer side surfaces are cooled more slowly, whereby the inner corners are given a higher hardness than the outer corners.
    Type: Grant
    Filed: December 6, 1996
    Date of Patent: August 31, 1999
    Assignee: Sandvik AB
    Inventors: Arvo Leini, Erik Sundstrom, Mats Lundstrom
  • Coated cutting insert
    Patent number: 5945207
    Abstract: There is disclosed a coated cutting insert particularly useful for cutting in cast iron materials. The insert is characterized by a straight WC-Co cemented carbide body having a highly W-alloyed Co binder phase, a well-defined surface content of Co and a coating including an innermost layer of TiC.sub.x N.sub.y O.sub.z with columnar grains, a layer of a fine-grained, textured Al.sub.2 O.sub.3 layer and a top layer of TiC.sub.x N.sub.y O.sub.z that has been removed along the cutting edge line.
    Type: Grant
    Filed: September 5, 1997
    Date of Patent: August 31, 1999
    Assignee: Sandvik AB
    Inventors: .ANG.sa Kutscher, Kenneth Westergren, Bjorn Ljungberg, Anders Lenander
  • Pipe wrench
    Patent number: D413237
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: August 31, 1999
    Assignee: Sandvik AB
    Inventors: Conny Jansson, Hans Himbert, Hakan Bergkvist
  • Saw sheath
    Patent number: D414330
    Type: Grant
    Filed: April 17, 1998
    Date of Patent: September 28, 1999
    Assignee: Sandvik AB
    Inventors: Eckhard Eriksson, Staffan Lindberg, Staffan Garras
  • Sheath for scissors or shears
    Patent number: D415890
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: November 2, 1999
    Assignee: Sandvik AB
    Inventors: Eckhard Eriksson, Staffan Lindberg
  • Drill bit
    Patent number: D416029
    Type: Grant
    Filed: October 29, 1998
    Date of Patent: November 2, 1999
    Assignee: Sandvik AB
    Inventor: Vlado Cosic