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).
-
Patent number: 6200671Abstract: 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 &kgr;-Al2O3 and a top layer of TiN. The layers are deposited by using CVD-methods.Type: GrantFiled: September 1, 1998Date of Patent: March 13, 2001Assignee: Sandvik ABInventors: Per Lindskog, Per Gustafson, Björn Ljungberg, Åke Östlund
-
Patent number: 6177178Abstract: 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 &kgr;-Al2O3 and, preferably, a top layer of TiN. The layers are deposited by using CVD methods.Type: GrantFiled: September 1, 1998Date of Patent: January 23, 2001Assignee: Sandvik ABInventors: Åke {umlaut over (O)}stlund, Jeanette Persson, Björn Ljungberg
-
Patent number: 6139921Abstract: A method for depositing refractory alumina (A.sub.2 O.sub.3) thin layers on cutting tools made of cemented carbide, cermet, ceramics or high speed steel is disclosed. The present method is a Plasma Activated Chemical Vapor Deposition (PACVD) process in which the plasma is produced by applying a bipolar pulsed DC voltage across two electrodes to which the tool substrates to be coated are fixtured and electrically connected.In contrast to prior art methods, built-up electrical charge on non-conducting surfaces is suppressed and hence, no arcing occurs on said surfaces. This will permit stable, long-term processing,With the present method, high-quality coatings of either single phase gamma-Al.sub.2 O.sub.3 or of a mixture of gamma- and alpha-Al.sub.2 O.sub.3 phases can be deposited on cutting tools at deposition temperatures as low as 500.degree. C.Type: GrantFiled: November 23, 1998Date of Patent: October 31, 2000Assignee: Sandvik ABInventors: Christine Taschner, Ingolf Endler, Albrecht Leonhardt, Bjorn Ljungberg, Mats Sjostrand
-
Patent number: 5980988Abstract: A body with a coating comprising one or more refractory layers of which at least one layer is a layer of .alpha.-Al.sub.2 O.sub.3 textured in the (110) direction is disclosed. Said alumina layer which is essentially free of cooling cracks, comprises platelike grains with a length of 2-8 .mu.m and a length/width ratio of 1-10, preferably 3-7. The coated tools according to the presently claimed invention show improved tool lives compared to prior art tools when used for machining steel or cast iron material.Type: GrantFiled: October 9, 1997Date of Patent: November 9, 1999Assignee: Sandvik ABInventor: Bjorn Ljungberg
-
Patent number: 5945207Abstract: 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 TiC.sub.x N.sub.y O.sub.z with columnar grains, a layer of a fine-grained, textured Al.sub.2 O.sub.3 layer and a top layer of TiC.sub.x N.sub.y O.sub.z that has been removed along the cutting edge line.Type: GrantFiled: September 5, 1997Date of Patent: August 31, 1999Assignee: Sandvik ABInventors: .ANG.sa Kutscher, Kenneth Westergren, Bjorn Ljungberg, Anders Lenander
-
Patent number: 5912051Abstract: 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 TiC.sub.x N.sub.y O.sub.z with columnar grains and a top coating of a fine gained .alpha.-Al.sub.2 O.sub.3 layer.Type: GrantFiled: March 4, 1998Date of Patent: June 15, 1999Assignee: Sandvik ABInventors: Bjorn Olsson, Bjorn Ljungberg
-
Patent number: 5863640Abstract: A coated cutting insert particularly useful for intermittent cutting of low alloyed steel. The insert is characterized by a WC-Co-based cemented carbide body having a highly W-alloyed Co-binder phase and a coating including an inner layer of TiC.sub.x N.sub.y O.sub.z with columnar grains and an outer coating of a fine grained, textured .alpha.-Al.sub.2 O.sub.3 -layer.Type: GrantFiled: July 3, 1996Date of Patent: January 26, 1999Assignee: Sandvik ABInventors: Bjorn Ljungberg, Leif kesson
-
Patent number: 5851687Abstract: A body with a coating comprising one or more refractory layers of which at least one layer is a layer of .alpha.-Al.sub.2 O.sub.3 textured in the (110)-direction is disclosed. Said alumina layer which is essentially free of cooling cracks, comprises platelike grains with a length of 2-8 .mu.m and a length/width ratio of 1-10, preferably 3-7. The coated tools according to the presently claimed invention show improved tool lives compared to prior art tools when used for machining steel or cast iron material.Type: GrantFiled: November 25, 1994Date of Patent: December 22, 1998Assignee: Sandvik ABInventor: Bjorn Ljungberg
-
Patent number: 5834061Abstract: A body is disclosed with a coating comprising one or more refractory layers of which one layer is an outermost smooth, shiny 110-textured .alpha.-Al.sub.2 O.sub.3 layer. Said A1.sub.2 0.sub.3 layer has a surface appearance almost like a polished A1.sub.2 0.sub.3 layer. Coated tools show improved tool lives compared to prior art tools when used for machining steel or cast iron material preferably for near net shape machining.Type: GrantFiled: July 22, 1997Date of Patent: November 10, 1998Assignee: Sandvik ABInventor: Bjorn Ljungberg
-
Patent number: 5786069Abstract: 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 TiC.sub.x N.sub.y O.sub.z with columnar grains and a top layer of fine grained .kappa.-Al.sub.2 O.sub.3.Type: GrantFiled: August 28, 1996Date of Patent: July 28, 1998Assignee: Sandvik ABInventors: Bjorn Ljungberg, Leif kesson
-
Patent number: 5766782Abstract: 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 .alpha.-Al.sub.2 O.sub.3 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.Type: GrantFiled: December 29, 1994Date of Patent: June 16, 1998Assignee: Sandvik ABInventor: Bjorn Ljungberg
-
Patent number: 5759621Abstract: There is provided a method of coating cutting tool inserts by CVD methods with a completely covering coating. During the coating step, the inserts are resting in contact with the support in only a few tiny spots and sufficient space is allowed around each insert to ascertain optimum coating conditions. In a preferred embodiment, each insert rests on a peg allowing a rational production in larger scale and fully automatic CVD loading.Type: GrantFiled: August 28, 1996Date of Patent: June 2, 1998Assignee: Sandvik ABInventors: Tor Norrgrann, Kjell Palsson, Bjorn Ljungberg, Ingemar Hessman
-
Patent number: 5702808Abstract: A body is disclosed with a coating comprising one or more refractory layers of which one layer is an outermost smooth, shiny 110-textured .alpha.-Al.sub.2 O.sub.3 layer. Said Al.sub.2 O.sub.3 layer has a surface appearance almost like a polished Al.sub.2 O.sub.3 layer. Coated tools show improved tool lives compared to prior art tools when used for machining steel or cast iron material preferably for near net shape machining.Type: GrantFiled: November 14, 1995Date of Patent: December 30, 1997Assignee: Sandvik ABInventor: Bjorn Ljungberg
-
Patent number: 5674564Abstract: A sintered hard material body is at least partly coated with at least one 0.5-20 .mu.m wear resistant ceramic oxide coating being <80% thicker in the edges than on the flat surfaces. The oxide coating exhibits a grain size (.O slashed.) in .mu.m for which:.O slashed..ltoreq.kx+awherex is coating thickness in .mu.m on at least 80% of the flat surface of the body,k=0.5, preferably 0.3, anda=2 .mu.m for 4.ltoreq.x<20 and a=0 for 0.5<x<4.The oxide coating is achieved by using a deposition process in which the body is in contact with a gas containing one or more halides of a metal or metals and a hydrolyzing and/or oxidizing agent forming the metal oxides and with an additional reactant (dopant) of sulphur, phosphorus, selenium, tellurium, arsenic, antimony and/or bismuth and/or compounds thereof. The temperature during deposition is in the range of 800.degree.-1000.degree. C., preferably 850.degree.-970.degree. C., and the volume concentration of the additional reactant is 0.25-3%, preferably 0.Type: GrantFiled: May 30, 1995Date of Patent: October 7, 1997Assignee: Sandvik ABInventors: Bjorn Ljungberg, Mats Sjostrand, Jan Lindstrom
-
Patent number: 5654035Abstract: A method of coating a body coated with refractory single- or multi-layers, 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 comprises one or several refractory layers of which at least one layer is a dense, fine-grained layer of .alpha.-Al.sub.2 O.sub.3 preferably textured in the (012) direction. The coated tool according to the present invention 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.Type: GrantFiled: September 22, 1995Date of Patent: August 5, 1997Assignee: Sandvik ABInventors: Bjorn Ljungberg, Anders Lenander
-
Patent number: 5576058Abstract: There is provided a method of coating cutting tool inserts by CVD methods with a completely covering coating. During the coating step, the inserts are resting in contact with the support in only a few tiny spots and sufficient space is allowed around each insert to ascertain optimum coating conditions. In a preferred embodiment, each insert rests on a peg allowing a rational production in larger scale and fully automatic CVD loading.Type: GrantFiled: March 17, 1995Date of Patent: November 19, 1996Assignee: Sandvik ABInventors: Tor Norrgrann, Kjell P.ang.lsson, Bjorn Ljungberg
-
Patent number: 5487625Abstract: A coated cutting tool body is coated with one or several refractory layers of which at least one layer is a dense, fine-grained layer of .alpha.-Al.sub.2 O.sub.3 preferably textured in the (012) direction. The coated tool according to the present invention 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.Type: GrantFiled: November 30, 1993Date of Patent: January 30, 1996Assignee: Sandvik ABInventors: Bjorn Ljungberg, Anders Lenander