Patents Assigned to Sandvik Aktiebolag
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Patent number: 7011867Abstract: A coated cutting tool is composed of one or more layers of refractory compounds of which at least one layer is single-phase ?-alumina with a pronounced columnar grain-structure and strong texture in the [300]-direction. The alumina layer is preferably deposited by CVD (Chemical Vapor Deposition) and the preferred microstructure and texture are achieved by adding a second metal halide, and a texture modifying agent, to the reaction gas. When coated cemented carbide cutting tools according to the invention are used in the machining of steel or cast iron, several important improvements compared to prior art have been observed, particularly in the machining of nodular cast iron.Type: GrantFiled: April 14, 2004Date of Patent: March 14, 2006Assignee: Sandvik AktiebolagInventor: Per M{dot over (a)}rtensson
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Publication number: 20050262975Abstract: Feed back vibrations of a metallic tool generated during the machining of metallic workpieces are damped by detecting an oscillatory motion of the tool, identifying a frequency of the oscillatory motion and generating a mechanical camping force having the same frequency as the oscillatory motion and applied to the tool in counter-direction to a velocity of the oscillatory motion. The damping force can be of constant amplitude or gradually decreasing amplitude.Type: ApplicationFiled: July 12, 2005Publication date: December 1, 2005Applicant: SANDVIK AKTIEBOLAGInventor: Mikael Lundblad
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Patent number: 6948891Abstract: A drilling tool set includes a plurality of drilling tools having different operative drill diameters to blast drill holes of different respective diameters. Each drilling tool of the set has a basic body defining a central axis of rotation, and two replaceable indexable bits including a center bit and a periphery bit which are mountable in respective center and periphery pockets formed in a front end of the basic body. The periphery bits of the respective drill tools of the set are identical, and the center bits of the respective drill tools of the set are identical. Each of the center and periphery pockets of each drill tool defines a radial center point. A first of the drill tools has a smaller operative drill diameter than a second of the drill tools. The first tool includes a first periphery pocket and a center pocket. The center point of the first periphery pocket is disposed closer to the axis than is the center point of the second periphery pocket.Type: GrantFiled: May 29, 2003Date of Patent: September 27, 2005Assignee: Sandvik AktiebolagInventor: Stefan Roman
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Patent number: 6948889Abstract: A tool intended for chip removing machining includes a holder and a cutting insert which have respective connecting surfaces arranged to engage each other and define an interface. A ridge having a tapering cross-sectional shape is formed in one of the connecting surfaces, and a groove having a tapering cross-sectional shape is formed in the other connecting surface, which groove receives the ridge. Both of the ridge and groove are in the shape of curves as viewed in a direction perpendicular to the respective connecting surface. The curve shape may be circular, elliptical, or polygonal.Type: GrantFiled: March 21, 2003Date of Patent: September 27, 2005Assignee: Sandvik AktiebolagInventor: Peder Arvidsson
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Patent number: 6929432Abstract: A drilling tool includes a basic body defining a center axis of rotation and having two chip channels and two replaceable indexable cutting bits in the form of a center bit and a periphery bit mounted in respective center and periphery pockets formed in an axially front end of the basic body. The center bit and the center pocket are spaced radially from the periphery bit and the periphery pocket along a first diametrical plane of the basic body. At least the center bit includes four identically-shaped cutting edges, one of which constituting an operative cutting edge intersected by a second diametrical plane oriented perpendicularly to the first diametrical plane. Each cutting edge of the center bit comprises first and second part edges joined by a transition edge portion.Type: GrantFiled: May 29, 2003Date of Patent: August 16, 2005Assignee: Sandvik AktiebolagInventors: Stefan Roman, Leif Widin
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Patent number: 6926472Abstract: A cutting tool includes a basic body having a insert seat and a rotatable cutting insert mounted on a connecting surface of the seat. The insert includes a chip cutting top side, a bottom side and an outer peripheral side, whereby there is a cutting edge in the area between the top side and the peripheral side. Formed on the connecting surface of the seat is at least one first ring formation, and formed in the bottom surface of the insert is at least one second ring formation having an equal diameter as the first ring formation. At least one of the first and second ring formations comprises a groove. The first and second ring formations are in direct or indirect engagement with each other in order to form a guide between the cutting insert and the basic body that permits rotation of the cutting insert about its own center axis and simultaneously keeps the insert in an exactly defined radial position.Type: GrantFiled: March 21, 2003Date of Patent: August 9, 2005Assignee: Sandvik AktiebolagInventor: Peder Arvidsson
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Patent number: 6916138Abstract: A drilling tool includes a drill body having chip channel formed therein and carrying cutting inserts at front ends of respective chip channels. Disposed in the chip channels at a location spaced from the cutting insert are respective damping elements. Each damping element comprises first and second portions formed of respective materials of different rigidity.Type: GrantFiled: June 1, 2001Date of Patent: July 12, 2005Assignee: Sandvik AktiebolagInventors: Marie-Louise Bergholt, Leif Karlsson, Tommy Tukala
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Patent number: 6902764Abstract: 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 ?-Al2O3. Said ?-Al2O3 layer consists of essentially equiaxed grains with an average grain size of <1 ?m and with a bimodal grain size distribution with coarser grains with an average grainsize in the interval 0.5-1 ?m and finer grains with an average grainsize of <0.5 ?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: GrantFiled: January 15, 2004Date of Patent: June 7, 2005Assignee: Sandvik AktiebolagInventors: Björn Ljungberg, Lars-Anders Budzynski
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Patent number: 6871859Abstract: A toolholder and insert arrangement includes an insert having a cutting portion and a shank portion disposed at a base of the cutting portion. The toolholder has a first end attachable to a spindle and a second end having a shank-receiving opening. When the toolholder is at ordinary room temperature, the shank-receiving opening is smaller than the shank portion. Upon heating of the toolholder to a predetermined temperature above the ordinary room temperature and above an ordinary operating temperature, the shank-receiving opening expands to become at least as large as the shank portion. Upon cooling of the toolholder to a temperature below the predetermined temperature and after insertion of the shank portion in the shank-receiving opening, the shank-receiving opening shrinks to generally conform to a shape of the shank portion.Type: GrantFiled: December 14, 2000Date of Patent: March 29, 2005Assignee: Sandvik AktiebolagInventors: Mikael Lundblad, Sven Engstrand
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Patent number: 6869668Abstract: A coated cutting tool is composed of one or more layers of refractory compounds of which at least one layer is single-phase ?-alumina with a pronounced columnar grain-structure and strong texture in the [300]-direction. The alumina layer is preferably deposited by CVD (Chemical Vapor Deposition) and the preferred microstructure and texture are achieved by adding a second metal halide, and a texture modifying agent, to the reaction gas. When coated cemented carbide cutting tools according to the invention are used in the machining of steel or cast iron, several important improvements compared to prior art have been observed, particularly in the machining of nodular cast iron.Type: GrantFiled: February 13, 2002Date of Patent: March 22, 2005Assignee: Sandvik AktiebolagInventor: Per Mårtensson
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Patent number: 6854367Abstract: A cutting tool system includes a clamping device and a cutting tool mounted therein. The cutting tool carries a cutting edge and includes a shaft clamped within an aperture of the clamping device. Prior to being clamped, the shaft is movable relative to the clamping device in either a longitudinal or rotational direction, in order to locate the cutting edge in a desired position. Either the clamping device or the cutting tool carries a spring-loaded device which engages a recess formed in the other of the cutting tool and clamping device when the cutting tool and its cutting edge are in a desired position, to provide an indication that the cutting tool is in such desired position by providing a sudden increase in a force necessary to displace the cutting tool out of such desired position.Type: GrantFiled: April 20, 2001Date of Patent: February 15, 2005Assignee: Sandvik AktiebolagInventors: Håkan Ericksson, Tryggve Sörlund
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Publication number: 20040240955Abstract: Feed back vibrations of a metallic tool generated during the machining of metallic workpieces are damped by detecting an oscillatory motion of the tool, identifying a frequency of the oscillatory motion and generating a mechanical camping force having the same frequency as the oscillatory motion and applied to the tool in counter-direction to a velocity of the oscillatory motion. The damping force can be of constant amplitude or gradually decreasing amplitude.Type: ApplicationFiled: May 24, 2004Publication date: December 2, 2004Applicant: SANDVIK AKTIEBOLAGInventor: Mikael Lundblad
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Patent number: 6814526Abstract: A holder is designed to receive a cutting insert intended for parting and grooving operations. The insert is clampable in a seat formed between a blade tongue and a clamping finger which respectively extend from lower and upper front parts of the holder. A gap separates those front parts in order to enable those parts to be forced towards each other by means of a clamping mechanism mounted in the holder. The clamping mechanism comprises a drawbar, a first end portion of which is movable within a bore formed in one of the front parts, and a second end portion of which is fixed in the other front part. The first end portion of the drawbar includes a head having a frusto-conical abutment surface. A tightening screw is threadedly mounted in the same front part as the head and is arranged to contact the abutment surface to displace the drawbar in a direction forcing the clamping finger and the tongue together to clamp the cutting insert in place.Type: GrantFiled: April 19, 2002Date of Patent: November 9, 2004Assignee: Sandvik AktiebolagInventors: Akio Shiraiwa, Per Hansson
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Publication number: 20040202877Abstract: A coated cutting tool is composed of one or more layers of refractory compounds of which at least one layer is single-phase &agr;-alumina with a pronounced columnar grain-structure and strong texture in the [300]-direction. The alumina layer is preferably deposited by CVD (Chemical Vapor Deposition) and the preferred microstructure and texture are achieved by adding a second metal halide, and a texture modifying agent, to the reaction gas. When coated cemented carbide cutting tools according to the invention are used in the machining of steel or cast iron, several important improvements compared to prior art have been observed, particularly in the machining of nodular cast iron.Type: ApplicationFiled: April 14, 2004Publication date: October 14, 2004Applicant: SANDVIK AKTIEBOLAGInventor: Per Martensson
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Publication number: 20040197581Abstract: The invention relates to the use of PVD technique for the application of a low static friction and wear resistant coating consisting essentially of titanium nitride or a diamond-like carbon—DLC, with or without an addition of tungsten carbide, on a stainless steel, in one and the same operation as the surface hardening of the stainless steel. In this way, in one single operation, a low static friction is obtained on a very hard and wear resistant surface. Moreover, the dimensions of the work-piece are maintained unaltered, which makes the invention very useful in the production of, e.g., cam followers, cylinder tubes and piston rods for shock absorbers. The used stainless steel has the following composition (in weight %): carbon max about 0.1; nitrogen max about 0.1; copper from about 0.5 to about 4; chromium from about 10 to about 14; molybdenum from about 0.5 to about 6; nickel from about 7 to about 11; cobalt 0 to about 9; tantalum max about 0.1; niobium max about 0.1; vanadium max 0.Type: ApplicationFiled: January 13, 2004Publication date: October 7, 2004Applicant: Sandvik AktiebolagInventor: Goran Berglund
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Publication number: 20040173288Abstract: The present invention relates to a surface hardened and coated stainless steel said surface showing low static friction and with improved wear resistance. Moreover, it relates to a coating of the surface of said stainless steel, in which a surface hardening is accomplished simultaneously with said coating. The resulting coated steel showing a very high hardness simultaneously as it shows improved adherence. Said steel advantageously being used in applications with high requirements regarding a combination of high strength and/or toughness and wear resistance together with low friction, such as, e.g., shock absorbers and items for combustion engines and hydraulic systems, produced with a highly cost effective process.Type: ApplicationFiled: January 13, 2004Publication date: September 9, 2004Applicant: Sandvik AktiebolagInventor: Goran Berglund
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Patent number: 6786682Abstract: The cutting plate in the form of a polyhedron comprises a front surface (1) and a rear surface (2) at an angle to it, cutting edges (3), strengthening facet (4), inclined to the plane of the cutting edges, and a swarf-breaking groove (5). The strengthening facet is in the form of three sectors, the angle of inclination of which to be the plane of the cutting edges is determined from specified expressions. The third sector of the strengthening facet is wider than the first two sectors.Type: GrantFiled: October 17, 2001Date of Patent: September 7, 2004Assignee: Sandvik AktiebolagInventor: Jörgen Wiman
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Publication number: 20040144302Abstract: 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: ApplicationFiled: January 15, 2004Publication date: July 29, 2004Applicant: SANDVIK AKTIEBOLAGInventors: Bjorn Ljungberg, Lars-Anders Budzynski
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Patent number: 6767583Abstract: 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: GrantFiled: August 13, 2003Date of Patent: July 27, 2004Assignee: Sandvik AktiebolagInventors: Anders Nordgren, Ingemar Hessman, Marian Mikus
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Patent number: 6733215Abstract: A cutting insert intended for heavy turning operations has a top side, a bottom side, a front surface disposed between the top and bottom sides, and a cutting edge disposed in the area between the top side and the front surface. The cutting insert includes a comparatively thick front part having a chip breaker positioned behind the edge and a rear part, which is thinner than the front part and tapers rearwardly therefrom. Disposed in the top side of the rear part is a recess for receiving a clamping unit to fix the cutting insert in a co-operating sear of a holder.Type: GrantFiled: September 5, 2001Date of Patent: May 11, 2004Assignee: Sandvik AktiebolagInventor: Robert Isaksson