Patents by Inventor Bjorn Ljungberg
Bjorn Ljungberg has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20070009763Abstract: The present invention relates to a CVD-coated cutting tool insert with a TiCxNy-layer with a low tensile stress level of from about 50 to about 390 MPa and an ?-Al2O3-layer with a high surface smoothness with a mean Ra<0.12 ?m as measured by AFM-technique. This is obtained by subjecting the coating to an intensive wet blasting operation.Type: ApplicationFiled: June 16, 2006Publication date: January 11, 2007Inventors: Peter Littecke, Bjorn Ljungberg
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Publication number: 20060204757Abstract: A CVD-coated cutting tool insert with a TiCxNy-layer with a low tensile stress level of 10-300 MPa and an ?-Al2O3-layer with a high surface smoothness of <0.1 ?m as measured by AFM-technique is disclosed. This is obtained by subjecting the coating to a first intensive wet blasting operation with a slurry of F80 grits of Al2O3 followed by a second wet blasting treatment with a slurry of F320 grits of Al2O3.Type: ApplicationFiled: February 23, 2006Publication date: September 14, 2006Inventor: Bjorn Ljungberg
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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: 6855413Abstract: A body is at least partially coated with one or more refractory layers of which at least one layer is of a fine grained ?-Al2O3. Said ?-Al2O3 layer has equiaxed grains with an average grain size of <0.5 ?m. The Al2O3 layer also has at least one sublayer containing Al, Si and O. The fine grained ?-Al2O3 microstructure is obtained by periodically introducing a silicon halide, preferably SiCl4, during the Al2O3-process.Type: GrantFiled: October 21, 2003Date of Patent: February 15, 2005Assignee: Sandvik ABInventor: Björn Ljungberg
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Publication number: 20040253446Abstract: The present invention relates to a method of depositing a crystalline &agr;-Al2O3-layer onto a cutting tool insert by Chemical Vapor Deposition at a temperature of from about 625 to about 800° C.Type: ApplicationFiled: March 24, 2004Publication date: December 16, 2004Applicant: Sandvik ABInventor: Bjorn Ljungberg
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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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Publication number: 20040081824Abstract: A body is at least partially coated with one or more refractory layers of which at least one layer is of a fine grained &kgr;-Al2O3. Said &kgr;-Al2O3 layer has equiaxed grains with an average grain size of <0.5 &mgr;m. The Al2O3 layer also has at least one sublayer containing Al, Si and O. The fine grained &kgr;-Al2O3 microstructure is obtained by periodically introducing a silicon halide, preferably SiCl4, during the Al2O3-process.Type: ApplicationFiled: October 21, 2003Publication date: April 29, 2004Applicant: SANDVIK AB, SANDVIKEN, SWEDEN.Inventor: Bjorn Ljungberg
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Patent number: 6713172Abstract: 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: GrantFiled: November 2, 2001Date of Patent: March 30, 2004Assignee: Sandvik AktiebolagInventors: Björn Ljungberg, Lars-Anders Budzynski
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Patent number: 6673430Abstract: The present invention describes a coated cutting tool for metal machining. The coating is formed by one or more layers of refractory compounds of which at least one layer of fine-grained, crystalline &ggr;-phase alumina, Al2O3, with a grainsize less than 0.1 &mgr;m. The Al2O3 layer is deposited with a bipolar pulsed DMS technique (Dual Magnetron Sputtering) at substrate temperatures in the range 450° C. to 700° C. preferably 550° C. to 650° C., depending on the particular material of the tool body to be coated. Identification of the &ggr;-phase alumina is made by X-ray diffraction. Reflexes from the (400) and (440) planes occurring at the 2&thgr;0- angles 45.8 and 66.8 degrees when using CuK&agr; radiation identify the &ggr;-phase Al2O3. The alumina layer is also very strongly textured in the [440]-direction. The Al2O3 layer is virtually free of cracks and halogen impurities. Furthermore, the Al2O3 layer gives the cutting edge of the tool an extremely smooth surface finish.Type: GrantFiled: May 22, 2002Date of Patent: January 6, 2004Assignees: Sandvik AB, Fraunhofer-Gesellschaft zur Forderung der angewandten Forschung e.V.Inventors: Siegfried Schiller, Klaus Goedicke, Fred Fietzke, Olaf Zywitzki, Mats Sjöstrand, Björn Ljungberg, Tomas Hilding, Viveka Alfredsson
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Patent number: 6673393Abstract: A body is at least partially coated with one or more refractory layers of which at least one layer is of a finegrained &kgr;-Al2O3. Said &kgr;-Al2O3 layer has equiaxed grains with an average grain size of <0.5 &mgr;m. The Al2O3 layer also has at least one sublayer containing Al, Si and O. The finegrained &kgr;-Al2O3 microstructure is obtained by periodically introducing a silicon halide, preferably SiCl4, during the Al2O3-process.Type: GrantFiled: May 28, 2002Date of Patent: January 6, 2004Assignee: Sandvik ABInventor: Björn Ljungberg
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Publication number: 20030027015Abstract: The present invention describes a coated cutting tool for metal maching. The coating is formed by one or more layers of refractory compounds of which at least one layer of fine-grained, crystalline &ggr;-phase alumina, Al2O3, with a grainsize less than 0.1 &mgr;m. The Al2O3 layer is deposited with a bipolar pulsed DMS technique (Dual Magnetron Sputtering) at substrate temperatures in the range 450° C. to 700 C.° preferably 550 C.° to 650 C.°, depending on the particular material of the tool body to be coated. Identification of the &ggr;-phase alumina is made by X-ray diffraction. Reflexes from the (400) and (440) planes occurring at the 2&thgr;-angles 45.8 and 66.8 degrees when using CuK&agr; radiation identify the &ggr;-phase Al2O3. The alumina layer is also very strongly textured in the [440]-direction. The Al2O3 layer is virtually free of cracks and halogen impurities. Furthermore, the Al2O3 layer gives the cutting edge of the tool an extremely smooth surface finish.Type: ApplicationFiled: May 22, 2002Publication date: February 6, 2003Inventors: Siegfried Schiller, Klaus Goedicke, Fred Fietzke, Olaf Zywitzki, Mats Sjostrand, Bjorn Ljungberg, Tomas Hilding, Viveka Alfredsson
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Publication number: 20030008181Abstract: A body is at least partially coated with one or more refractory layers of which at least one layer is of a finegrained &kgr;-Al2O3. Said &kgr;-Al2O3 layer has equiaxed grains with an average grain size of <0.5 &mgr;m. The Al2O3 layer also has at least one sublayer containing Al, Si and O. The finegrained &kgr;-Al2O3 microstructure is obtained by periodically introducing a silicon halide, preferably SiCl4, during the Al2O3-process.Type: ApplicationFiled: May 28, 2002Publication date: January 9, 2003Inventor: Bjorn Ljungberg
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Patent number: 6451180Abstract: The present invention relates to a process for producing a coated cutting tool consisting of a coating and a substrate, wherein at least one refractory layer consisting of fine-grained, crystalline &ggr;-Al2O3 is deposited by reactive magnetron sputtering onto the moving substrate in a vacuum by pulsed magnetron sputtering in a mixture of a rare gas and a reactive gas at a pulse frequency set for 10 to 100 kHz. The deposition occurs with a rate of at least 1 nm/s with reference to a stationarily arranged substrate at a magnetron target power density in time average set for at least 10 W/cm2. The substrate temperature is in the range 400 to 700° C. and the flux of impinging particles onto each individual substrate is cyclically interrupted.Type: GrantFiled: May 2, 2000Date of Patent: September 17, 2002Assignee: Sandvik ABInventors: Siegfried Schiller, Klaus Goedicke, Fred Fietzke, Olaf Zywitzki, Mats Sjöstrand, Björn Ljungberg
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Publication number: 20020122701Abstract: 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: November 2, 2001Publication date: September 5, 2002Inventors: Bjorn Ljungberg, Lars-Anders Budzynski
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Patent number: 6423403Abstract: The present invention describes a coated substrate material. The coating is formed by one or more layers of refractory compounds of which at least one layer of fine-grained, crystalline &ggr;-phase alumina, Al2O3, with a grainsize less than 0.1 &mgr;m. The Al2O3layer is deposited with a bipolar pulsed DMS technique (Dual Magnetron Sputtering) at substrate temperatures in the range 450° C. to 700° C., preferably 550° C. to 650° C., depending on the particular substrate material. Identification of the &ggr;-phase alumina is made by X-ray diffraction. Reflexes from the (400) and (440) planes occurring at the 2&thgr;-angles 45.8 and 66.8 degrees when using CuK&agr; radiation identify the &ggr;-phase Al2O3. The alumina layer is also very strongly textured in the [440]-direction. The Al2O3 layer is virtually free of cracks and halogen impurities. Furthermore, the Al2O3 layer gives the cutting edge of the tool an extremely smooth surface finish.Type: GrantFiled: February 14, 2001Date of Patent: July 23, 2002Assignees: Sandvik AB, Fraunhofer Gesillschaft zur Forderung der Angewandten Forschung E.V.Inventors: Siegfried Schiller, Klaus Goedicke, Fred Fietzke, Olaf Zywitzki, Mats Sjöstrand, Björn Ljungberg, Tomas Hilding, Viveka Alfredsson
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Publication number: 20020051871Abstract: The present invention relates to a coated cemented carbide insert for turning of steel, like low alloyed steels, carbon steels and tough hardened steels at high cutting speeds. The cemented carbide consists of WC, 2-10 wt. % Co and 4-12 wt. % of cubic carbides of metals from groups 4, 5 or 6 of the periodic table, preferably Ti, Ta and Nb. The Co-binder phase is highly alloyed with W with a CW-ratio of 0.75-0.90. The insert has a binder phase enriched and essentially cubic carbide free surface zone A of a thickness of <20 &mgr;m and along a line C essentially bisecting the edge, in the direction from the edge to the center of the insert, a binder phase content increases essentially monotonously until it reaches the bulk composition. The binder phase content at the edge is 0.65-0.75 times the binder phase content by volume of the bulk and the depth of the binder phase depletion is 100-300 &mgr;m, preferably 150-250 &mgr;m.Type: ApplicationFiled: October 11, 2001Publication date: May 2, 2002Inventors: Lisa Palmqvist, Mikael Lindholm, Anders Lenander, Bjorn Ljungberg, Michael Thysell
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Patent number: 6333100Abstract: The present invention relates to a coated cemented carbide insert for turning of steel, like low alloyed steels, carbon steels and tough hardened steels at high cutting speeds. The cemented carbide consists of WC, 2-10 wt. % Co and 4-12 wt. % of cubic carbides of metals from groups 4, 5 or 6 of the periodic table, preferably Ti, Ta and Nb. The Co-binder phase is highly alloyed with W with a CW-ratio of 0.75-0.90. The insert has a binder phase enriched and essentially cubic carbide free surface zone A of a thickness of <20 &mgr;m and along a line C essentially bisecting the edge, in the direction from the edge to the centre of the insert, a binder phase content increases essentially monotonously until it reaches the bulk composition. The binder phase content at the edge is 0.65-0.75 times the binder phase content by volume of the bulk and the depth of the binder phase depletion is 100-300 &mgr;m, preferably 150-250 &mgr;m.Type: GrantFiled: February 2, 2000Date of Patent: December 25, 2001Assignee: Sandvik ABInventors: Lisa Palmqvist, Mikael Lindholm, Anders Lenander, Björn Ljungberg, Michael Thysell
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Patent number: 6333098Abstract: The present invention discloses a coated cutting insert particularly useful for dry milling of grey cast iron. The insert is characterized by a WC—Co cemented carbide substrate and a coating including an innermost layer of TiCxNyOz with columnar grains and a top coating of a fine grained &agr;-Al2O3 layer.Type: GrantFiled: March 14, 1996Date of Patent: December 25, 2001Assignee: Sandvik ABInventors: Björn Olsson, Björn Ljungberg
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Publication number: 20010049011Abstract: The present invention describes a coated cutting tool for metal machining. The coating is composed of one or more layers of refractory compounds of which at least one layer consists of fine-grained, crystalline &ggr;-phase alumina, Al2O3, with a grainsize less than 0.1 &mgr;m. The Al2O3 layer is deposited with a bipolar pulsed DMS technique (Dual Magnetron Sputtering) at substrate temperatures in the range 450° C. to 700° C., preferably 550° C. to 650° C., depending on the particular material of the tool body to be coated. Identification of the &ggr;-phase alumina is made by X-ray diffraction. Reflexes from the (400) and (440) planes occurring at at the 2&thgr;-angles 45.8 and 66.8, degrees when using CuK&agr; radiation identify the &ggr;-phase Al2O3. The alumina layer is also very strongly textured in the [440]-direction.Type: ApplicationFiled: February 14, 2001Publication date: December 6, 2001Inventors: Siegfried Schiller, Klaus Goedicke, Fred Fietzke, Olaf Zywitzki, Mats Sjostrand, Bjorn Ljungberg, Tomas Hilding, Viveka Alfredsson
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Patent number: 6210726Abstract: The present invention describes a coated cutting tool for metal machining. The coating is formed by one or more layers of a refractory compound of which at least one layer of fine-grained, crystalline &ggr;-phase alumina, Al2O3, with a grain size of less than 0.1 &mgr;m. The Al2O3 layer is deposited with a bipolar pulsed DMS technique (Dual Magnetron Sputtering) at substrate temperatures in the range 450° C. to 700° C., preferably 550° C. to 650° C., depending on the particular material of the tool body to be coated. Identification of the &ggr;-phase alumina is made by X-ray diffraction. Reflexes from the (400) and (440) planes occurring at the 2&thgr;-angles 45.8 and 66.8 degrees when using Cu&kgr;&agr; radiation identify the &ggr;-phase Al2O3. The alumina layer is also very strongly textured in the [(440)]-direction. The Al2O3 layer is virtually free of cracks and halogen impurities. Furthermore, the Al2O3 layer gives the cutting edge of the tool an extremely smooth surface finish.Type: GrantFiled: November 6, 1998Date of Patent: April 3, 2001Assignee: Sandvik ABInventors: Siegfried Schiller, Klaus Goedicke, Fred Fietzke, Olaf Zywitzki, Mats Sjöstrand, Björn Ljungberg, Tomas Hilding, Viveka Alfredsson