Patents by Inventor Leif Akesson

Leif Akesson 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).

  • Publication number: 20190010583
    Abstract: The present disclosure relates to a cutting tool of a cemented carbide substrate including WC and a binder phase having one or more of Co, Fe and Ni, wherein the cemented carbide also includes a finely dispersed eta phase of Me12C and/or Me6C carbides, where Me is one or more metals selected from W, Mo and the binder phase metals, wherein the substoichiometric carbon content in the cemented carbide is between ?0.30 to ?0.16 wt %. The disclosed cutting tool will achieve an improved resistance against comb cracks.
    Type: Application
    Filed: December 16, 2016
    Publication date: January 10, 2019
    Inventors: Leif ÅKESSON, Jose Luis GARCIA, Kare FINNEID
  • Publication number: 20090242824
    Abstract: The present invention relates to a WC—Co cemented carbide alloy. By adding an extremely small amount of Ti, V, Zr, Ta or Nb or a combination of these, a grain refined cemented carbide structure with less abnormal WC-grains has been obtained.
    Type: Application
    Filed: June 13, 2007
    Publication date: October 1, 2009
    Inventors: Leif Äkesson, Susanne Norgren, Alexandra Kusoffsky
  • Publication number: 20080224344
    Abstract: The present invention relates to a method of making a cemented carbide body. The body is made using conventional powder metallurgical methods such as milling, pressing and sintering. According to the invention, a combined sintering process is used comprising at least a sequence where the batch of bodies in the sintering furnace is heated to a sintering temperature at least above the melting point of the binder phase. The batch of bodies in the sintering furnace is then allowed to cool down to a temperature at least below the melting point of the binder phase and kept there for at least from about 1 but preferably less than about 30 minutes and then heated up again to a sintering temperature at least above the binder phase melting point. The present invention also relates to a cemented carbide body made according to the method.
    Type: Application
    Filed: March 12, 2008
    Publication date: September 18, 2008
    Inventors: Kenneth Westergren, Marian Mikus, Leif Akesson
  • Publication number: 20080210064
    Abstract: A cutting tool insert has a cermet body with a Co and/or Ni binder phase and a coating deposited as monolayer or as multiple and/or alternating layers of carbide, nitride or oxide. The coating has a thickness of 21-50 ?m, when the inserts have a flat rake face, without or with simple chipbreakers and a Co binder phase, or has a thickness of 10-50 ?m, when the inserts have a rake face land with a width of 100-300 ?m with an angle of 10-25° to the rake face and a Co and/or Ni binder phase. The cermet body has more than 50 vol. % Ti-based carbonitride and less than 15 wt % and more than 6 wt % Co and/or Ni binder phase and a hardness of >1650 HV3. The disclosure also relates to the use of the coated cutting tool insert for the machining of cast iron work pieces.
    Type: Application
    Filed: February 28, 2007
    Publication date: September 4, 2008
    Inventors: Marian Mikus, Kenneth Westergren, Leif Akesson, Per Martensson
  • Publication number: 20080166192
    Abstract: The present invention relates to coated cutting tool inserts particularly useful for heavy roughing turning operations of very large steel components, such as drive shafts for ships and shafts for wind power plants. The inserts are large with an iC, inscribed circle diameter, of greater than or equal to about 19 mm and a thickness of greater than or equal to about 6 mm with a composition of from about 5 to about 10 wt-% Co, from about 5 to about 12 wt-% cubic carbides or carbonitrides of the metals Ti, Ta and/or Nb, and balance WC with a stratified binder phase enriched surface zone from about 15 to about 40 ?m thick. The inserts have an edge rounding before coating of 35-95 ?m. The coating comprises a first, innermost layer of TiCxNyOz and a total thickness from about 0.1 to about 1.5 ?m, a second layer of TiCxNy with a thickness of from about 4.5 to about 9.5 ?m with columnar grains, a third layer of TiCxNyOz with a thickness of from about 0.3 to about 1.
    Type: Application
    Filed: December 21, 2007
    Publication date: July 10, 2008
    Inventors: Leif Akesson, Kenneth Westergren
  • Publication number: 20080070046
    Abstract: The present invention relates to a method of machining a metal workpiece with a coated cutting tool insert comprising a cemented carbide body and a coating deposited as monolayer(s) or as multiple and/or alternating layers. The coating has a total thickness of 25-75 ?m and the machining is performed at a cutting speed of >600 m/min, preferably 800-1500 m/min. The invention also relates to a coated cutting tool useful for such machining operation.
    Type: Application
    Filed: October 3, 2005
    Publication date: March 20, 2008
    Inventors: Kenneth Westergren, Marian Mikus, Leif Akesson
  • Publication number: 20070292672
    Abstract: 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: Application
    Filed: May 23, 2007
    Publication date: December 20, 2007
    Inventors: Bjorn Ljungberg, Leif Akesson, Ibrahim Sadik
  • Publication number: 20070292671
    Abstract: The present invention relates to a coated cemented carbide milling insert for either wet or dry machining of cast iron such as nodular cast iron (NCI), grey cast iron (GCI), austempered ductile iron (ADI) and compacted graphite iron (CGI) where a high wear resistance and an excellent resistance against thermo cracks are required comprising: a substrate comprising from about 5 to about 7 wt-% Co, from about 140 to about 250 ppm Ti+Ta and balance WC with a weight ratio Ti/Ta of from about 0.8 to about 1.3 and a PVD-layer consisting of AlxTi1-xN, with x=from about 0.50 to about 0.70 and with a thickness of from about 1 to about 10 ?m. The invention also relates to a method for making cutting tool inserts and their use.
    Type: Application
    Filed: May 23, 2007
    Publication date: December 20, 2007
    Inventors: Leif Akesson, Toril Myrtveit, Ibrahim Sadik
  • Publication number: 20070148497
    Abstract: 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: Application
    Filed: December 8, 2006
    Publication date: June 28, 2007
    Inventors: Rickard Sundstrom, Susanne Norgren, Marie Pettersson, Leif Akesson, Bjorn Ljungberg
  • Publication number: 20040084224
    Abstract: A bore hole opener for enlarging a bore hole includes a longitudinal body, a duct for drilling fluid, formed longitudinally in the body, having a fluid passage cross-section of inside radius i, and at least two hole-opening arms, borne by the body, which have an active part equipped with cutting mechanisms, which are arranged therein in such a way that they can slide between a position of rest in the body and an active position partially out of the body, and which are guided and supported for this purpose in the body over a distance g and which, in the active position, project from the body by a length o, in which the values of i, g and o are chosen to simultaneously satisfy the conditions i+g+o S;
    Type: Application
    Filed: September 11, 2003
    Publication date: May 6, 2004
    Applicant: Halliburton Energy Services, Inc.
    Inventors: Jean-Pierre Lassoie, Philippe Fanuel, Antonio Carosielli, Leif Akesson
  • Patent number: 5761593
    Abstract: A cemented carbide insert with improved toughness and resistance against plastic deformation containing WC and cubic phases of carbide and/or carbonitride in a binder phase based on Co and/or Ni with a binder phase enriched surface zone is disclosed. The binder phase content in the insert is 3.5-12 weight-%. In a zone below the binder phase enriched surface zone, the binder phase content is 0.85-1 of the binder phase content in the inner portion of the insert and the content of cubic phases is essentially constant and equal to the content in the inner portion of the insert. The insert is formed by sintering a cemented carbide containing a nitrogen-containing material in a vacuum or inert atmosphere and heat treating the sintered insert in nitrogen at 40-400 mbar at a temperature of 1280.degree.-1430.degree. C. for a time of 5-100 min.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: June 2, 1998
    Assignee: Sandvik AB
    Inventors: Ake Ostlund, Ulf Oscarsson, Per Gustafson, Leif Akesson
  • Patent number: 5649279
    Abstract: There is disclosed a new process for binder phase enrichment. The process combines binder phase enrichment by dissolution of cubic phase with the requirements that cause formation of stratified layers, resulting in a unique structure. The new structure is characterized by, in comparison with the ones previously known, deeper stratified layers and less maximum binder phase enrichment. The possibility of combining dissolution of the cubic phase with formation of stratified layers offers new possibilities to optimize the properties of tungsten carbide based cemented carbides for cutting tools.The new process offers possibilities to combine the two types of gradients. The dissolution of cubic phase moves the zone with maximum mount of stratified binder phase from the surface to a zone close to and below the dissolution front.
    Type: Grant
    Filed: November 17, 1994
    Date of Patent: July 15, 1997
    Assignee: Sandvik AB
    Inventors: Per Gustafson, Leif Akesson, Ake Ostlund
  • Patent number: 5549980
    Abstract: A cemented carbide insert with improved toughness and resistance against plastic deformation containing WC and cubic phases of carbide and/or carbonitride in a binder phase based on Co and/or Ni with a binder phase enriched surface zone is disclosed. The binder phase content in the insert is 3.5-12 weight-%. In a zone below the binder phase enriched surface zone, the binder phase content is 0.85-1 of the binder phase content in the inner portion of the insert and the content of cubic phases is essentially constant and equal to the content in the inner portion of the insert.
    Type: Grant
    Filed: June 10, 1994
    Date of Patent: August 27, 1996
    Assignee: Sandvik AB
    Inventors: Ake Ostlund, Ulf Oscarsson, Per Gustafson, Leif Akesson
  • Patent number: 5484468
    Abstract: Cemented carbide inserts are available containing WC and cubic phases of carbide and/or carbonitride in a binder phase based on cobalt and/or nickel with a binder phase enriched surface zone. The binder phase content along a line essentially bisecting the rounded edge surfaces increases toward the edge and cubic phase is present. As a result, the edge toughness of the cutting inserts is improved.
    Type: Grant
    Filed: February 7, 1994
    Date of Patent: January 16, 1996
    Assignee: Sandvik AB
    Inventors: Ake Ostlund, Ulf Oskarsson, Per Gustafson, Leif Akesson
  • Patent number: 5451469
    Abstract: There is disclosed a new process for binder phase enrichment. The process combines binder phase enrichment by dissolution of cubic phase with the requirements that cause formation of stratified layers, resulting in a unique structure. The new structure is characterized by, in comparison with the ones previously known, deeper stratified layers and less maximum binder phase enrichment. The possibility of combining dissolution of the cubic phase with formation of stratified layers offers new possibilities to optimize the properties of tungsten carbide based cemented carbides for cutting tools.The new process offers possibilities to combine the two types of gradients. The dissolution of cubic phase moves the zone with maximum amount of stratified binder phase from the surface to a zone close to and below the dissolution front.
    Type: Grant
    Filed: November 30, 1993
    Date of Patent: September 19, 1995
    Assignee: Sandvik AB
    Inventors: Per Gustafson, Leif Akesson, Ake Ostlund