Patents Assigned to Sandvik
  • Cutting insert for chip removing machining
    Patent number: 6715967
    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.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: April 6, 2004
    Assignee: Sandvik Aktiebolag
    Inventors: Jörgen Wiman, Ronnie Löf
  • Cutting insert for grooving operations
    Patent number: 6715968
    Abstract: A double ended metal-cutting insert includes a pair of circular cutting edges disposed at respective end surfaces of the insert. Each end surface includes an upper portion connected to the cutting edge, and a lower portion connected to the upper portion by a concave transition portion. The lower portion is recessed relative to the upper portion in a direction toward the opposite cutting edge. The lower portion is a flat face oriented perpendicular to the bottom surface.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: April 6, 2004
    Assignee: Sandvik Aktiebolag
    Inventors: Pär Tägtström, Per Hansson, Claes Andersson
  • Oxide coated cutting tool
    Patent number: 6713172
    Abstract: According to the present invention there is provided a body at least partially coated with one or more refractory layers of which at least one layer essentially consist of &agr;-Al2O3. Said &agr;-Al2O3 layer consists of essentially equiaxed grains with an average grain size of <1 &mgr;m and with a bimodal grain size distribution with coarser grains with an average grainsize in the interval 0.5-1 &mgr;m and finer grains with an average grainsize of <0.5 &mgr;m. The Al2O3 layer further contains striated zones containing titanium (>5 at %) but no nitrogen or carbon. This particular microstructure is obtained by temporarily stopping the gases needed for the growth of the Al2O3 layer and introducing TiCl4.
    Type: Grant
    Filed: November 2, 2001
    Date of Patent: March 30, 2004
    Assignee: Sandvik Aktiebolag
    Inventors: Björn Ljungberg, Lars-Anders Budzynski
  • Rotatable cutting tool
    Patent number: 6709204
    Abstract: A rotatable tool includes a rotatable body defining an axis of rotation. The body forms a seat configured to receive a cutting insert. The seat includes a bottom surface and a radial support upstanding therefrom. The bottom surface includes a screw-receiving hole which intersects the bottom surface to form a port therein. The screw-receiving hole includes a female screw-threaded portion spaced from the port by a non-threaded portion. A fastening screw secures the cutting insert to the body. The screw includes a shaft having at one end thereof a male screw thread connectable to the female screw threaded portion, and at an opposite end thereof a head. The shaft also includes a non-threaded portion disposed between the male screw thread and the head and sized to be received in the non-threaded portion of the screw-receiving hole.
    Type: Grant
    Filed: August 9, 2002
    Date of Patent: March 23, 2004
    Assignee: Sandvik Aktiebolag
    Inventors: Lars Hellström, Göran Pantzar
  • Rotary cutting bit with material-deflecting ledge
    Patent number: 6709065
    Abstract: A cutting bit includes a steel body on which a carbide cutting tip is brazed. Disposed rearwardly of a rearwardmost end of the tip, on a tapered side surface of a head of the bit body is an annular ledge which extends laterally outwardly sufficiently far to deflect cuttings laterally away from the bit. The ledge can be formed integrally with the bit body as the result of a machining operation, or the ledge can comprise a split ring that is elastically held in a groove formed in the tapered side surface. The ledge extends perpendicularly to a center axis of the bit, or is inclined slightly forwardly, in order to trap cuttings, such as asphalt, to cause a protective ring of asphalt to be formed in front of the ledge.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: March 23, 2004
    Assignee: Sandvik AB
    Inventors: Kent Peay, Timothy J. Shean
  • Machine for chip cutting machining plus cutting tool for such machines
    Patent number: 6708590
    Abstract: A cutting tool (2) includes a front part (5), which has a cutting insert (6), as well as a rear part (7), which is detachably mountable in a holder (3) in an appurtenant machine. The tool (2) comprises a plurality of nozzles (13), which have the purpose of spraying jets (4) of high pressure cooling liquid towards the cutting insert (6). Supply of cooling liquid to these nozzles is guaranteed via a duct system positioned inside the tool, which system includes an equally large number of mutually spaced-apart ducts as the number of nozzles, the nozzles being adjusted in order to direct the jets thereof towards different points of impact on one and the same cutting insert. In this connection, it is possible to close the individual ducts inside the tool individually in order to enable spraying of only one jet at a time towards the appurtenant point of impact on the cutting insert.
    Type: Grant
    Filed: March 1, 2002
    Date of Patent: March 23, 2004
    Assignee: Sandvik Aktiebolag
    Inventor: Stig Lagerberg
  • Method and apparatus for the drying of cemented carbide powder and the like
    Publication number: 20040050957
    Abstract: A new method and apparatus for manufacturing powders of cemented carbide, cermets, ceramics and similar materials with good abrasive wear resistance starting from a slurry, wherein the slurry is introduced into a drop forming device including at least one essentially horizontal oriented rotating drop forming disk (12), from which the drops are slung out to solidify by centrifugal force.
    Type: Application
    Filed: August 25, 2003
    Publication date: March 18, 2004
    Applicant: SANDVIK AB
    Inventors: Alf Andersson, Bo Nelander, Ulf Jutterstrom
  • 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
  • Chip removing machining of a workpiece while applying high pressure cooling liquid
    Patent number: 6705805
    Abstract: The chip removing machining of a workpiece is performed by a cutting tool which includes a cutting insert. In order to cool the cutting insert, one or more over-cooling nozzles is arranged for directing a jet of cooling liquid downwardly toward a contact area between the workpiece and a chip surface of the cutting insert. A sub-cooling nozzle is arranged for directing a jet of cooling liquid upwardly toward a contact area between the workpiece and a flank surface of the cutting insert. A jet of cooling liquid can be emitted from only the over-cooling nozzle, or from only the sub-cooling nozzle, or from both of those nozzles simultaneously.
    Type: Grant
    Filed: February 26, 2002
    Date of Patent: March 16, 2004
    Assignee: Sandvik Aktiebolag
    Inventor: Stig Lagerberg
  • Cutting tool for parting and similar operations
    Patent number: 6702529
    Abstract: A parting tool includes a thin holder forming a groove open at one end, and a double-ended cutting insert mounted in the groove. The insert includes front and rear cutting edges and a rear end surface abutting against a rear support surface of the groove. The rear support surface is configured to enable differently shaped double-ended inserts to be mounted therein without the occurrence of contact between the rear cutting edge and a surface of the holder.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: March 9, 2004
    Assignee: Sandvik Aktiebolag
    Inventors: Pär Tägtström, Per Hansson, Claes Andersson, Börje Ahnlen
  • Rotatable cutting bit and retainer sleeve therefor
    Patent number: 6702393
    Abstract: A cutting assembly includes a holder and a cutting tool body mounted in a bore of the holder, and a retainer sleeve for retaining the tool body axially within the bore while permitting the tool body to rotate freely about a longitudinal axis thereof. The retainer sleeve includes inwardly bent tongues which engage a groove formed in a shank of the tool body. The retainer sleeve is configured to facilitate the escape of fines from the groove during a cutting operation.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: March 9, 2004
    Assignee: Sandvik Rock Tools, Inc.
    Inventor: Greg D. Mercier
  • 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
  • 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
  • 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
  • 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 cutting tool
    Patent number: D487281
    Type: Grant
    Filed: November 29, 2002
    Date of Patent: March 2, 2004
    Assignee: Sandvik Aktiebolag
    Inventors: Stefan Roman, Leif Widin