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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Patent number: 9109290Abstract: A coated cutting tool includes a coating and a substrate. The substrate is at least partly coated with a 4-10 ?m thick coating comprising two adjacent Ti(C,N)-layers where the difference (?) between the residual stress state of the inner layer and the residual stress state of the outer layer is 1000 MPa???2500 MPa, on at least a part of the cutting edge and/or on at least a part of the rake face. A method to produce such a difference between the residual stress states is also disclosed.Type: GrantFiled: July 1, 2010Date of Patent: August 18, 2015Assignee: Sandvik Intellectual Property ABInventors: Björn Ljungberg, Susanne Norgren
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Patent number: 8409733Abstract: The invention relates to a method of producing a cutting tool at least partly coated with an inner CVD coating and an outer PVD coating comprising the manufacturing steps of depositing the CVD coating, subjecting the CVD coating at least partly to an intensive wet-blasting operation, followed by depositing the PVD coating. The invention also relates to a coated cutting tool comprising a cemented carbide substrate of 5-14 wt-% Co, 0-8 wt-% cubic carbides of Ti, Ta or Nb or a combination thereof, and balance WC, said substrate being at least partly coated with a 4-14 ?m thick coating comprising an inner CVD coating and an outer PVD coating wherein the CVD coating has compressive stresses.Type: GrantFiled: September 7, 2007Date of Patent: April 2, 2013Assignee: Sandvik Intellectual Property ABInventor: Björn Ljungberg
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Patent number: 8318293Abstract: 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: GrantFiled: June 16, 2006Date of Patent: November 27, 2012Assignee: Sandvik Intellectual Property ABInventors: Peter Littecke, Björn Ljungberg
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Patent number: 8043729Abstract: The present invention discloses a coated cutting tool insert particularly useful for dry and wet machining, preferably milling, in low and medium alloyed steels, stainless steels, with or without raw surface zones under severe conditions such as vibrations, long overhang and recutting of chips. The insert is characterized by WC—Co cemented carbide with a W and Cr alloyed Co-binder phase and a coating including at least three TiCxNyOz layers and a top layer at least on the rake face of a smooth ?-Al2O3.Type: GrantFiled: December 8, 2006Date of Patent: October 25, 2011Assignee: Sandvik Intellectual Property ABInventors: Rickard Sundström, Susanne Norgren, Marie Pettersson, Leif Åkesson, Björn Ljungberg
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Publication number: 20110002749Abstract: A coated cutting tool includes a coating and a substrate. The substrate is at least partly coated with a 4-10 ?m thick coating comprising two adjacent Ti(C,N)-layers where the difference (?) between the residual stress state of the inner layer and the residual stress state of the outer layer is 1000 MPa???2500 MPa, on at least a part of the cutting edge and/or on at least a part of the rake face. A method to produce such a difference between the residual stress states is also disclosed.Type: ApplicationFiled: July 1, 2010Publication date: January 6, 2011Applicant: SANDVIK INTELLECTUAL PROPERTY ABInventors: Björn LJUNGBERG, Susanne Norgren
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Publication number: 20100061812Abstract: The invention relates to a method of producing a cutting tool at least partly coated with an inner CVD coating and an outer PVD coating comprising the manufacturing steps of depositing the CVD coating, subjecting the CVD coating at least partly to an intensive wet-blasting operation, followed by depositing the PVD coating. The invention also relates to a coated cutting tool comprising a cemented carbide substrate of 5-14 wt-% Co, 0-8 wt-% cubic carbides of Ti, Ta or Nb or a combination thereof, and balance WC, said substrate being at least partly coated with a 4-14 ?m thick coating comprising an inner CVD coating and an outer PVD coating wherein the CVD coating has compressive stresses.Type: ApplicationFiled: September 7, 2007Publication date: March 11, 2010Applicant: SANDVIK INTELLECTUAL PROPERTY ABInventor: Björn Ljungberg
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Patent number: 7655293Abstract: 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: GrantFiled: February 23, 2006Date of Patent: February 2, 2010Assignee: Sandvik Intellectual Property ABInventor: Björn Ljungberg
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Patent number: 7531214Abstract: A method of depositing a crystalline ?-Al2O3 layer onto a cutting tool insert by Chemical Vapor Deposition at a temperature of from about 625 to about 800° C. includes the following steps: depositing a from about 0.1 to about 1.5 ?m layer of TiCxNyOz where x+y+z>=1 and z>0, preferably z>0.2; treating said layer at 625-1000° C. in a gas mixture containing from about 0.5 to about 3 vol-% O2, preferably as CO2+H2, or O2+H2, for a short period of time from about 0.5 to about 4 min, optionally in the presence of from about 0.5 to about 6 vol-% HCl; and depositing said Al2O3-layer by bringing said treated layer into contact with a gas mixture containing from about 2 to about 10 vol-% of AlC3, from about 16 to about 40 vol-% of CO2, in H2 and 0.8-2 vol-% of a sulphur-containing agent, preferably H2S, at a process pressure of from about 40 to about 300 mbar. Also included is a cutting tool insert with a coating including at least one ?-Al2O3-layer.Type: GrantFiled: September 28, 2006Date of Patent: May 12, 2009Assignee: Sandvik Intellectual Property AktiebolagInventor: Bjorn Ljungberg
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Publication number: 20070292672Abstract: Coated cemented carbide milling inserts, particularly useful for rough and semifinishing milling of grey cast iron, highly alloyed grey cast iron, compacted graphite iron (CGI) with or without cast skin under dry conditions are described. The inserts are characterised by a WC-Co cemented carbide with a low content of cubic carbides and a W-alloyed binder phase and a coating including an inner layer of TiCxNy with columnar grains followed by a wet blasted layer of ?-Al2O3.on the rake face and colored top layer on the clearance side. The invention also relates to methods of making and using cutting tool inserts according to the above.Type: ApplicationFiled: May 23, 2007Publication date: December 20, 2007Inventors: Bjorn Ljungberg, Leif Akesson, Ibrahim Sadik
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Patent number: 7306636Abstract: The present invention relates to a method of depositing a crystalline ?-Al2O3-layer onto a cutting tool insert by Chemical Vapor Deposition at a temperature of from about 625 to about 800° C. The method comprises the following steps: depositing a from about 0.1 to about 1.5 ?m layer of TiCxNyOz where x+y+z>=1 and z>0, preferably z>0.2; treating said layer at 625-1000° C. in a gas mixture containing from about 0.5 to about 3 vol-% O2, preferably as CO2+H2 or O2+H2, for a short period of time from about 0.5 to about 4 min, optionally in the presence of from about 0.5 to about 6 vol-% HCl; and depositing said Al2O3-layer by bringing said treated layer into contact with a gas mixture containing from about 2 to about 10 vol-% of AlCl3, from about 16 to about 40 vol-% of CO2, in H2 and 0.8-2 vol-% of a sulphur-containing agent, preferably H2S, at a process pressure of from about 40 to about 300 mbar.Type: GrantFiled: March 24, 2004Date of Patent: December 11, 2007Assignee: Sandvik Intellectual Property ABInventor: Bjorn Ljungberg
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Publication number: 20070148497Abstract: The present invention discloses a coated cutting tool insert particularly useful for dry and wet machining, preferably milling, in low and medium alloyed steels, stainless steels, with or without raw surface zones under severe conditions such as vibrations, long overhang and recutting of chips. The insert is characterized by WC—Co cemented carbide with a W and Cr alloyed Co-binder phase and a coating including at least three TiCxNyOz layers and a top layer at least on the rake face of a smooth ?-Al2O3.Type: ApplicationFiled: December 8, 2006Publication date: June 28, 2007Inventors: Rickard Sundstrom, Susanne Norgren, Marie Pettersson, Leif Akesson, Bjorn Ljungberg
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Publication number: 20070020393Abstract: The present invention relates to a method of depositing a crystalline ?-Al2O3-layer onto a cutting tool insert by Chemical Vapor Deposition at a temperature of from about 625 to about 800° C. The method comprises the following steps: depositing a from about 0.1 to about 1.5 ?m layer of TiCxNyOz where x+y+z?1 and z>0, preferably z?0.2; treating said layer at 625-1000° C. in a gas mixture containing from about 0.5 to about 3 vol-% O2, preferably as CO2+H2 or O2+H2, for a short period of time from about 0.5 to about 4 min, optionally in the presence of from about 0.5 to about 6 vol-% HCl; and depositing said Al2O3-layer by bringing said treated layer into contact with a gas mixture containing from about 2 to about 10 vol-% of AlCl3, from about 16 to about 40 vol-% of CO2, in H2 and 0.8-2 vol-% of a sulphur-containing agent, preferably H2S, at a process pressure of from about 40 to about 300 mbar.Type: ApplicationFiled: September 28, 2006Publication date: January 25, 2007Inventor: Bjorn Ljungberg
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Patent number: RE39884Abstract: A coated milling insert particularly useful for milling in low and medium alloyed steels with or without raw surface zones during wet or dry conditions. The insert is characterized by 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 TiCxNyOz with columnar grains, a layer of ?-Al2O3 and, preferably, a top layer of TiN. The layers are deposited by using CVD methods.Type: GrantFiled: November 29, 1996Date of Patent: October 16, 2007Assignee: Sandvik Intellectual Property ABInventors: {dot over (A)}ke Östlund, Jeanette Persson, Björn Ljungberg
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Patent number: RE39894Abstract: 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 ?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 ?m, preferably 150-250 ?m. The insert is coated with 3-12 ?m columnar TiCN-layer followed by a 2-12 ?m thick Al2O3-layer.Type: GrantFiled: June 9, 2006Date of Patent: October 23, 2007Assignee: Sandvik Intellectual Property ABInventors: Lisa Palmqvist, Mikael Lindholm, Anders Lenander, Bjorn Ljungberg, Michael Thysell
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Patent number: RE39987Abstract: A coated turning insert particularly useful for turning of forged components of stainless steel low alloyed steel. The insert is characterized by a WC-Co cemented carbide body having a highly W-alloyed Co-binder phase and a coating including an innermost layer of TiCxNyOz with columnar grains and a top layer of fine grained ?-Al2O3.Type: GrantFiled: July 10, 2006Date of Patent: January 1, 2008Assignee: Sandvik Intellectual Property ABInventors: Bjorn Ljungberg, Leif Åkesson
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Patent number: RE39999Abstract: A coated turning insert particularly useful for turning in stainless steel is disclosed. The insert is characterized by a WC—Co-based cemented carbide substrate having a highly W-alloyed Co-binder phase and a coating including an inner layer of TiCxNyOz with columnar grains followed by a layer of fine-grained, ?-Al2O3 and a top layer of TiN. The layers are deposited by using CVD methods.Type: GrantFiled: November 29, 1996Date of Patent: January 8, 2008Assignee: Sandvik Intellectual Property ABInventors: Per Lindskog, Per Gustafson, Björn Ljungberg, Åke Östlund
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Patent number: RE40005Abstract: 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 TiCxNyOz with columnar grains, a layer of a fine-grained, textured Al2O3 layer and a top layer of TiCxNyOz that has been removed along the cutting edge line.Type: GrantFiled: June 9, 2006Date of Patent: January 15, 2008Assignee: Sandvik Intellectual Property ABInventors: Asa Kutscher, Kenneth Westergren, Björn Ljungberg, Anders Lenander
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Patent number: RE41248Abstract: 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: GrantFiled: July 12, 2006Date of Patent: April 20, 2010Assignee: Sanvik Intellectual Property AktiebolagInventors: Lisa Palmqvist, Mikael Lindholm, Anders Lenander, Bjorn Ljungberg, Michael Thysell
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Patent number: RE41972Abstract: There is provided a tool at least partly coated with at least two refractory layers of which one of the said layers is a fine-grained ?-Al2O3-layer which is the top layer along the cutting edge-line and the other a TiCxNyOz- or a ZrCxNy-layer being the top layer on the clearance face. The coated tool exhibits excellent flank and crater wear and high resistance to flaking, particularly when used for machining of low carbon steel and stainless steel. Used cutting edges can easily be identified by the naked eye.Type: GrantFiled: January 16, 2007Date of Patent: November 30, 2010Assignee: Sandvik Intellectual Property ABInventors: Anders Lenander, Bjorn Ljungberg
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Patent number: RE44870Abstract: A body such as a cutting tool coated with refractory single- or multilayers, wherein specific layers are characterized by a controlled microstructure and phase composition with crystal planes preferably grown in a preferential direction with respect to the surface of the coated body. The coating includes one or several refractory layers of which at least one layer is a dense, fine-grained layer of ?-Al2O3 preferably textured in the (104) direction. The coated tool exhibits excellent surface finish and shows much improved wear and toughness properties compared to prior art objects when used for machining steel, cast iron and, particularly, when machining nodular cast iron. REEXAMINATION RESULTS The questions raised in reexamination proceedings Nos. 90/009,410 and 90/009,666, filed May 5, 2009 and Feb. 24, 2010 respectively, have been considered, and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.Type: GrantFiled: August 8, 2008Date of Patent: April 29, 2014Assignee: Sandvik Intellectual Property ABInventor: Bjorn Ljungberg