Patents Assigned to Sandvik AB
  • Male portion, drill bit and threaded joint for percussive rock drilling
    Publication number: 20040050592
    Abstract: A male portion for percussive rock drilling includes sections of reduced cross-sectional area. At least one thread for percussive rock drilling is provided at an end of the male portion. The end of the male portion comprises an abutment surface for the transfer of impact waves. The length of the portion is defined as the length of an imaginary cylinder from a plane of the impact surface to a point where the plane ceases to contact a crest of the thread, wherein the length divided by the external diameter of the cylinder lies within a range of 1-2.
    Type: Application
    Filed: June 26, 2003
    Publication date: March 18, 2004
    Applicant: SANDVIK AB.
    Inventors: Bo Carlstrom, Anders Brungs, Christer Lundberg, Per-Olof Liljebrand
  • Method of increasing the length of life of heating elements at low temperatures
    Patent number: 6707016
    Abstract: A method of lengthening the useful life of heating elements that are formed essentially from molybdenum silicide and molybdenum tungsten silicide and different alloys of those basic materials, at times when the elements are operated at a relatively low temperature, such as a temperature in the range of 400-800° C. The gaseous atmosphere surrounding the elements as they operate has a water content that is less than about one percent by volume.
    Type: Grant
    Filed: November 2, 2002
    Date of Patent: March 16, 2004
    Assignee: Sandvik AB
    Inventor: Mats Sundberg
  • Method of making cemented carbide body
    Patent number: 6706327
    Abstract: A method of making a cemented carbide body having WC with an average grain size of 0.5-4 &mgr;m, 3.5-9 wt % Co and <2 wt % carbides of Ta, Ti and Nb, and with a substoichiometric carbon content, the method including sintering the body such that an eta phase containing structure is obtained with a size of 1-15 &mgr;m and a content of 10 vol. %-35 vol. %, and subjecting the body to recarburization such that the eta phase in a 50-350 &mgr;m wide intermediate zone is transformed to WC+Co without essentially changing its Co-content.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: March 16, 2004
    Assignee: Sandvik AB
    Inventors: Per Blomstedt, Mikael Lagerqvist, Marian Mikus
  • Method for cutting and machining hard materials
    Patent number: 6698415
    Abstract: Cutting tools and machining tools are provided having PCBN tips and/or coatings bonded to their cutting or machining surfaces for cutting or machining cement and/or mineral based hard building materials such as Hardiplank®.
    Type: Grant
    Filed: March 6, 2001
    Date of Patent: March 2, 2004
    Assignees: Smith International, Inc., Sandvik AB
    Inventors: Michael J. Garcia, Denis G. Pearce
  • Method of making cemented carbide insert
    Patent number: 6699526
    Abstract: A method of making a cutting insert includes forming a powder mixture containing WC, 2-10 wt % Co, 4-12 wt % cubic carbides, adding N in an amount of 0.9-1.7 % of the weight of the cubic carbides, mixing the powder with a pressing agent, milling and spray drying the mixture, compacting and sintering the material at 1300-1500 in an atmosphere of sintering gas 40-60 mbar, applying post-sintering treatment, and applying a coating by CVD or MTCVD.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: March 2, 2004
    Assignee: Sandvik AB
    Inventors: Lisa Palmqvist, Mikael Lindholm, Anders Lenander, Björn Lungberg, Michael Thysell
  • Rotatable tool having a replaceable cutting tip secured by a dovetail coupling
    Patent number: 6695551
    Abstract: A rotatable cutting tool includes a rotatable tool body and a replaceable cutting tip for chip removing machining. The tool body includes a forward free end having a first dovetail coupling part formed thereon. The cutting tip includes a front cutting end and a rear mounting end. The mounting end includes a second dovetail coupling part joined to the first dovetail coupling part. An actuator, such as a screw, is provided which is arranged for elastically deforming one of the dovetail coupling parts to create a tightly clamped relationship between the first and second dovetail coupling parts. Insertion of a replacement cutting tip is performed by laterally mating the dovetail coupling parts until one of the coupling parts abuts a laterally facing stop surface of the other coupling part.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: February 24, 2004
    Assignee: Sandvik AB
    Inventor: Bengt Silver
  • Coated inserts for rough milling
    Publication number: 20040033393
    Abstract: Coated milling insert has a WC-Co cemented carbide with a low content of cubic carbides and a highly W-alloyed binder phase and a coating including an inner layer of TiCxNy with columnar grains followed by a layer of &kgr;-Al2O3 and a top layer of TiN. The coated milling insert is particularly useful for milling of grey cast iron with or without cast skin under wet conditions at low and moderate cutting speeds and milling of nodular cast iron and compacted graphite iron with or without cast skin under wet conditions at moderate cutting speeds.
    Type: Application
    Filed: August 13, 2003
    Publication date: February 19, 2004
    Applicant: SANDVIK AB.
    Inventors: Anders Nordgren, Ingemar Hessman, Marian Mikus
  • Device for chip forming machining
    Publication number: 20040033113
    Abstract: A device for chip forming machining including first and second rotatable bodies arranged along a common axis of rotation. The first body forms a male element, and the second body forms a female element into which the male element is threaded for forming a threaded joint. The male element has an outer circumferential area displaced in the axial direction in relation to the thread thereof and which engages a corresponding inner circumferential area of the female element by a press-fit. One or both of those circumferential areas has an out-of-roundness, such that there occurs a press-fit along two or more preselected regions in the circumferential direction.
    Type: Application
    Filed: June 17, 2003
    Publication date: February 19, 2004
    Applicant: SANDVIK AB
    Inventors: Patrik Blomberg, Ake Danielsson
  • Rotatable machine spindle including a gas spring in which a lubricant-containing gas is confined
    Publication number: 20040033116
    Abstract: A machine spindle includes a rotatable casing in which a clamping device is mounted. The clamping device includes a drawbar for securing a cutting tool. The drawbar is axially displaced by a gas spring which includes a chamber in which a lubricant-containing gas medium is confined. A piston includes a head slidable within a cylindrical upper portion of the chamber, and a rod extending through a lower portion of the chamber and connected to the drawbar. The lower portion of the chamber is non-cylindrical and widens upwardly to promote the upward travel of lubricant toward the piston and upper seals under the effects of centrifugal force during rotation of the spindle.
    Type: Application
    Filed: June 17, 2003
    Publication date: February 19, 2004
    Applicant: SANDVIK AB
    Inventor: Ken Anderson
  • Cutting insert for grooving and profiling
    Patent number: 6692199
    Abstract: A cutting insert for grooving and parting as well as profiling and longitudinal turning of metallic work-pieces, includes a shaft part and at least one cutting head. There is a front end surface at the front end of the cutting insert, and a rear end surface at the rear end of the cutting insert. The shaft part includes a top side, a bottom side and side surfaces extending between the tope and bottom two sides. The cutting head carries a cutting edge defined by the intersection between a chip surface and a clearance surface. The cutting edge has a circular shape and has mainly a constant curvature between the ends thereof. The chip side of the cutting head is provided with a first chip-forming device placed immediately inside the cutting edge.
    Type: Grant
    Filed: January 30, 2003
    Date of Patent: February 17, 2004
    Assignee: Sandvik AB
    Inventors: Claes Andersson, Håkan Fransson
  • Cemented carbide body with improved high temperature and thermomechanical properties
    Patent number: 6692690
    Abstract: There is now provided a cemented carbide grade for rock excavation purposes with 88-96 weight % WC, preferably 91-95% weight % WC, with a binder phase consisting of only cobalt or cobalt and nickel, with a maximum of 25% of the binder being Ni, possibly with small additions of rare earth metals, such as Ce and Y, up to a maximum of 2% of the total cemented carbide. The WC grains are rounded because of the process of coating the WC with cobalt, and not recrystallized or showing grain growth or very sharp cornered grains like conventionally milled WC, thus giving the bodies surprisingly high thermal conductivity. The average grain size should be from 8-30 &mgr;m, preferably from 12-20 &mgr;m. The maximum grain size does not exceed 2 times the average value and no more than 2% of the grains found in the structure are less than half of the average grain size.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: February 17, 2004
    Assignee: Sandvik AB
    Inventors: Jan &angst;kerman, Thomas Ericson
  • Tool for chip-removing machining
    Publication number: 20040028486
    Abstract: A tool for chip-removing machining includes an insert holder, a cutting insert for chip-removing machining, and a fixing element for fixing the cutting insert in an insert seat of the insert holder. The insert has fingers projecting from a bottom side of the insert. The insert seat has a number of elastically flexible portions forming recesses therebetween which receive respective fingers of the insert. Contact surfaces of the fingers engage respective contact surfaces of the flexible portions to cause the flexible portions to flex elastically as the fingers become wedgingly secured in the recesses.
    Type: Application
    Filed: May 23, 2003
    Publication date: February 12, 2004
    Applicant: SANDVIK AB.
    Inventor: Kjell Englund
  • Vibration-dampened tool for working in metallic material
    Publication number: 20040028490
    Abstract: A drill for working in metallic materials includes a tool body having located in its front end at least one cutting insert, wherein the tool body is provided with one or several damping elements mounted such that during machining, a relative movement (i.e., sliding and/or deformation) of the tool body and the damping element is allowed to occur.
    Type: Application
    Filed: June 5, 2003
    Publication date: February 12, 2004
    Applicant: SANDVIK AB
    Inventors: Marie-Louie Bergholt, Leif Karlsson, Klas Tubinger
  • Use of stainless steel alloy as umbilical tubes in seawater environment
    Patent number: 6689231
    Abstract: The invention relates to a ferrite-austenitic alloy and its use, the alloy has a composition with a mixture defined as: C maximum 0.05%, Si maximum 0.8%, Mn 0.30-1.5%, Cr 28.0-30.0%, Ni 5.80-7.40%, Mo 2.00-2.50%, N 0.30-0.40%, Cu maximum 1.0%, W maximum 2.0%, S maximum 0.010%, 30-70% ferrite and the balance austenite for tubes filled with hydraulic fluid, as transport tubes for solutions for chemical injection, or another uses in the application of umbilicals.
    Type: Grant
    Filed: June 21, 2000
    Date of Patent: February 10, 2004
    Assignee: Sandvik AB
    Inventor: Pasi Kangas
  • Guide tube of a drill string configured to facilitate unscrewing thereof from a member of the drill string
    Patent number: 6681875
    Abstract: A guide tube for use in a rock drill string includes a main portion, a sleeve disposed at a first end of the main portion, and a male thread portion disposed at a second end of the main portion. The sleeve forms a recess having a female thread. A flush channel extends through the guide tube. The main portion includes a section of reduced cross-section disposed adjacent the sleeve for defining a generally radially extending shoulder between the waist and the sleeve. The shoulder serves to support the guide tube on a rig as percussion is applied to the guide tube for loosening a threaded joint between the guide tube and another member.
    Type: Grant
    Filed: October 22, 2001
    Date of Patent: January 27, 2004
    Assignee: Sandvik AB
    Inventors: Kenneth Larsson, Gösta Reuter
  • Tool holder having a clamp plate for transmitting clamping forces from a clamping arm to a cutting insert
    Patent number: 6682273
    Abstract: A cutting insert is clamped in a pocket of a holder by a top clamp assembly which includes a clamp arm screwed to the holder, and a clamp plate interposed between the insert and a front part of the clamp arm. The clamp plate is formed of a harder and more wear-resistant material than the clamp arm and transmits clamping forces from the clamp arm to the cutting insert. The hard clamp plate shields the clamp arm from being impacted by chips generated during a machining operation, thereby minimizing wearing of the clamp arm.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: January 27, 2004
    Assignee: Sandvik AB
    Inventors: Sture Sjöö, Per Hansson
  • Surface modified stainless steel
    Publication number: 20040009296
    Abstract: A method has been developed for surface modifications of high temperature resistant alloys, such as FeCrAl alloys, in order to increase their resistance to corrosion at high temperatures. Coating it with a Ca-containing compound before heat-treating builds a continuous uniform and adherent layer on the surface of the alloy, that the aluminum depletion of the FeCrAl alloy is reduced under cyclic thermal stress. By this surface modification the resistance to high temperature corrosion of the FeCrAl alloy and its lifetime are significantly increased.
    Type: Application
    Filed: July 11, 2003
    Publication date: January 15, 2004
    Applicant: SANDVIK AB
    Inventors: Jan Andersson, Magnus Cedergren
  • Porous cubic boron nitride based material suitable for subsequent production of cutting tools and method for its production
    Patent number: 6676893
    Abstract: The presently claimed invention relates to a method of making a PcBN cutting tool insert. The method includes the following steps: mixing raw material powders, (e.g., cBN, hBN, TiC, TiN, Ti(C,N), WC, W, C, Co, Co2Al9, Al AlN, Al2O3) with a liquid (e.g., ethanol) and an agent (e.g., polyethylene glycol, PEG) to form a homogeneous slurry with the desired composition; forming spherical powder agglomerates, typically 100 &mgr;m in diameter, preferably by spray drying; pressing said agglomerates to form a body of desired dimensions and density using conventional tool pressing technology; removing the agent from the powder at a suitable temperature and atmosphere; raising the temperature to 1000-1350° C. in vacuum; solid state sintering the body at 1000-1350° C. in vacuum, for 1-90 minutes to form a body with 35-55 vol % porosity; optionally, adding 0.
    Type: Grant
    Filed: April 25, 2002
    Date of Patent: January 13, 2004
    Assignee: Sandvik AB
    Inventors: Ulf Rolander, Gerold Weinl
  • Method for the formation of solid particles from a liquid
    Patent number: 6676860
    Abstract: Solid particles are formed from a liquid by rotating a slinger about a vertical axis within a chamber to sling liquid droplets from vertically spaced annular rows of cusps disposed on an outer periphery of the slinger. An air flow is established within the chamber, the air flow rotating in a direction opposite the direction of rotation of the slinger. The air flow opposes travel of threads formed between successively slung droplets to cause the threads to separate from the droplets and turn into dust particles which become entrained in the air flow. The dust particles can thus be collected separately from particles formed by the droplets.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: January 13, 2004
    Assignee: Sandvik AB
    Inventor: Alf Andersson
  • Copper base alloy
    Publication number: 20040005239
    Abstract: A copper base alloy, which is resistant or immune to carburization, metal dusting and coking, and resistant to oxidation, the alloy having the following composition (all contents in weight %):
    Type: Application
    Filed: February 28, 2003
    Publication date: January 8, 2004
    Applicant: SANDVIK AB
    Inventors: Peter Szakalos, Mats Lundberg, Johan Hernblom