Patents by Inventor Ralf Lehto

Ralf Lehto 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: 20210146449
    Abstract: The present invention relates to a method for producing an object of metal, wherein the object is built with an additive manufacturing process on at least one base device having a build surface at one end. The base device is part of a base device system, which includes the base device and a supporting means holding the base device in a fixed position during the additive manufacturing process. The method includes the steps of building the object on at least a part of the base device build surface with the additive manufacturing process, removing the base device from the supporting means, connecting the base device to a CNC machine provided with at least one machining tool, and separating the built object from the base device by means of a machining tool in the CNC machine.
    Type: Application
    Filed: April 5, 2019
    Publication date: May 20, 2021
    Inventors: Per VIKLUND, Einar OTTESEN, Ralf LEHTO
  • Patent number: 10695838
    Abstract: A tool body and a tool for cutting machining, wherein the tool body extends in an axial direction and at least a portion of the tool body is formed with a solid outer jacket encasing a core structure. The core structure includes a three-dimensional open lattice structure attached to the outer jacket and made of a lattice structure material. The core structure further includes a filling structure of a solid phase filling material that is different from the lattice structure material, wherein the filling structure surrounds the lattice structure. The lattice structure and the outer jacket are manufactured using additive manufacturing and the filling material is added to the lattice structure in the form of a liquid or a powder, which is thereafter solidified.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: June 30, 2020
    Assignee: SANDVIK INTELLECTUAL PROPERTY AB
    Inventors: Ralf Lehto, Per Viklund
  • Publication number: 20200055128
    Abstract: A milling tool for metal cutting machining has a tool holder with a shaft. At least one disc milling cutter having a central through-hole is mounted on the shaft. The disc milling cutter has internal coolant channels extending radially therein and connected to a coolant source through axial through-holes aligned with axial through-holes of one or more spacer rings, which are also mounted on the shaft, so as to provide for feeding of coolant to the disc milling cutter when placed in different positions along the extension of the shaft.
    Type: Application
    Filed: October 4, 2017
    Publication date: February 20, 2020
    Inventor: Ralf LEHTO
  • Patent number: 10399156
    Abstract: A tool for chip-removing machining including a tool body and at least one cutting insert mounted in an insert seat of the tool body. The cutting insert includes an upper side and a lower side directed toward a bottom contact surface of the insert seat. The cutting insert is formed by sintering together two compacted powder parts, one of the parts forming an upper part and the other forming a lower part. An imaginary plane is defined between the lower and upper parts. A side surface extends between the upper and lower sides around the periphery of the cutting insert, and at least one cutting edge is formed in a transition between the upper side and the side surface. The tool is configured so that the tool body contacts the side surface of the cutting insert only above the imaginary plane along an upper part of the side surface.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: September 3, 2019
    Assignee: SANDVIK INTELLECTUAL PROPERTY AB
    Inventors: Per Viklund, Ralf Lehto
  • Publication number: 20190084047
    Abstract: A tool body and a tool for cutting machining, wherein the tool body extends in an axial direction and at least a portion of the tool body is formed with a solid outer jacket encasing a core structure. The core structure includes a three-dimensional open lattice structure attached to the outer jacket and made of a lattice structure material. The core structure further includes a filling structure of a solid phase filling material that is different from the lattice structure material, wherein the filling structure surrounds the lattice structure. The lattice structure and the outer jacket are manufactured using additive manufacturing and the filling material is added to the lattice structure in the form of a liquid or a powder, which is thereafter solidified.
    Type: Application
    Filed: February 14, 2017
    Publication date: March 21, 2019
    Inventors: Ralf LEHTO, Per VIKLUND
  • Publication number: 20180243844
    Abstract: A tool for chip-removing machining including a tool body and at least one cutting insert mounted in an insert seat of the tool body. The cutting insert includes an upper side and a lower side directed toward a bottom contact surface of the insert seat. The cutting insert is formed by sintering together two compacted powder parts, one of the parts forming an upper part and the other forming a lower part. An imaginary plane is defined between the lower and upper parts. A side surface extends between the upper and lower sides around the periphery of the cutting insert, and at least one cutting edge is formed in a transition between the upper side and the side surface. The tool is configured so that the tool body contacts the side surface of the cutting insert only above the imaginary plane along an upper part of the side surface.
    Type: Application
    Filed: June 8, 2016
    Publication date: August 30, 2018
    Inventors: Per VIKLUND, Ralf LEHTO
  • Patent number: 9676043
    Abstract: A milling disc is formed as a generally circular disc having a center axis and including an outer peripheral surface provided with a number of cutting edges, a first side having a bearing surface around the center axis, and attachment means arranged to interact with mating attachment means of a rotatable mounting shaft to allow rotary preventing attachment of the milling disc to the rotatable shaft and forcing of the bearing surface towards a mounting surface at an end surface of the shaft. The milling disc is provided with at least one flushing fluid channel having a confined cross-section and extending within the milling disc from an inlet opening in its bearing surface to at least one outlet opening in its peripheral surface. There is also provided a rotatable mounting shaft for the rotatable attachment of such a milling disc.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: June 13, 2017
    Assignee: SANDVIK INTELLECTUAL PROPRTY AB
    Inventor: Ralf Lehto
  • Patent number: 9333568
    Abstract: A double-sided, indexable milling insert has a round basic shape defined by an imaginary cylinder, which is concentric with a center axis and extends between two reference planes that extend perpendicular to the center axis and are equidistantly separated from a neutral plane. The milling insert includes a pair of opposite chip faces located in the reference planes between which an envelope surface concentric with the center axis extends, a plurality of identical and alternately usable cutting edges along the peripheries of the chip faces, and lock means for rotationally securing the milling insert in one of several predetermined index positions. The individual cutting edge has the shape of a wave trough and includes two edge segments that meet at a bottom point.
    Type: Grant
    Filed: January 16, 2013
    Date of Patent: May 10, 2016
    Assignee: SANDVIK INTELLECTUAL PROPERTY AB
    Inventors: Ralf Lehto, Per Viklund
  • Patent number: 9238273
    Abstract: A milling tool is disclosed having a front head and a rear holder, which are detachably connected by means of a male/female coupling as well as a screw and a washer. Via a main duct, cooling liquid is fed to a chamber, from which it is fed out via branch ducts to individual milling inserts. The front chamber is closed by means of a cover that is held applied against a ring surface surrounding the chamber. The cover is tightenable by means of a threaded joint that is operative independently of a threaded joint between the screw and a front section of the main duct.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: January 19, 2016
    Assignee: Sandvik Intellectual Property AB
    Inventors: Ralf Lehto, Lennart Wihlborg
  • Publication number: 20150290726
    Abstract: A milling disc is formed as a generally circular disc having a center axis and including an outer peripheral surface provided with a number of cutting edges, a first side having a bearing surface around the center axis, and attachment means arranged to interact with mating attachment means of a rotatable mounting shaft to allow rotary preventing attachment of the milling disc to the rotatable shaft and forcing of the bearing surface towards a mounting surface at an end surface of the shaft. The milling disc is provided with at least one flushing fluid channel having a confined cross-section and extending within the milling disc from an inlet opening in its bearing surface to at least one outlet opening in its peripheral surface. There is also provided a rotatable mounting shaft for the rotatable attachment of such a milling disc.
    Type: Application
    Filed: April 9, 2015
    Publication date: October 15, 2015
    Inventor: Ralf LEHTO
  • Patent number: 8596934
    Abstract: Milling insert and tool for center cutting milling of material. At least one first cutting edge is terminated in or adjacent to a center axis defined by the milling insert and includes a first cutting edge portion having a first radius that is essentially equally great for each point of the first cutting edge portion. The first cutting edge includes at least one second cutting edge portion that is plane or has at least one second radius for each point of the respective second cutting edge portion, the at least one second radius being greater than the first radius and that is situated between the first cutting edge portion and the center axis. One second cutting edge portion adjoins the first cutting edge portion, and one second cutting edge portion is terminated in or adjacent to the center axis.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: December 3, 2013
    Assignee: Sandvik Intellectual Property AB
    Inventors: Ralf Lehto, Rickard Sundström, Johan Bergquist
  • Publication number: 20120275876
    Abstract: A milling tool is disclosed having a front head and a rear holder, which are detachably connected by means of a male/female coupling as well as a screw and a washer. Via a main duct, cooling liquid is fed to a chamber, from which it is fed out via branch ducts to individual milling inserts. The front chamber is closed by means of a cover that is held applied against a ring surface surrounding the chamber. The cover is tightenable by means of a threaded joint that is operative independently of a threaded joint between the screw and a front section of the main duct.
    Type: Application
    Filed: March 29, 2012
    Publication date: November 1, 2012
    Applicant: Sandvik Intellectual Property AB
    Inventors: Ralf Lehto, Lennart Wihlborg
  • Patent number: 8226333
    Abstract: A cutting tool, and a loose top therefore, includes two parts detachably connected to each other via a threaded joint in which co-operating male and female threads are included in the form of helicoidal ridges. The profile shape of each helicoidal ridge is defined by a top and two flanks, which delimit a helicoidal groove having a bottom. The first flank is inclined in relation to a center axis of the tool at a first angle that is smaller than a second angle of the second flank in relation to the center axis. Accordingly, the thread ridge is reinforced in comparison with thread ridges having a symmetrical profile shape, whereby larger tensile forces than compressive forces can be applied to the threaded joint while avoiding damage to the thread ridges.
    Type: Grant
    Filed: September 17, 2009
    Date of Patent: July 24, 2012
    Assignee: Sandvik Intellectual Property AB
    Inventors: Isak Kakai, Ralf Lehto, Kenneth Larsson, Magnus Örtlund
  • Publication number: 20120051850
    Abstract: A milling insert for center cutting milling of material is disclosed, which milling insert is arranged to be arranged in a seat that is defined by a milling cutter body and situated at a rotation axis defined by the milling cutter body, the milling cutter body being connectable to a rotatable holder. The milling insert includes a plurality of cutting edges, where at least one first cutting edge is terminated in or adjacent to a center axis defined by the milling insert, the first cutting edge including a first cutting edge portion having a first radius that is essentially equally great for each point of the first cutting edge portion. The first cutting edge includes at least one second cutting edge portion that is plane or has at least one second radius for each point of the respective second cutting edge portion, the at least one second radius being greater than the first radius.
    Type: Application
    Filed: August 18, 2011
    Publication date: March 1, 2012
    Applicant: Sandvik Intellectual Property AB
    Inventors: Ralf LEHTO, Rickard Sundström, Johan Bergquist
  • Patent number: 7794182
    Abstract: An indexable milling insert includes opposite top and bottom sides between which a peripheral clearance surface extends, and two opposite cutting edges formed in the transition between the top side and the clearance surface. Each of the cutting edges includes a substantially straight portion connected with a straight section of the clearance surface, and further includes a curved portion connected with a convexly arched section of the clearance surface. A coupling including one or more male- and/or female-like engagement members is located along said clearance surface. Furthermore, the milling insert may be used with a shim plate for attachment to a milling tool.
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: September 14, 2010
    Assignee: Sandvik Intellectual Property AB
    Inventors: Ralf Lehto, Lars-Gunnar Wallström, Göran Pantzar, Per Blomstedt
  • Patent number: 7713004
    Abstract: A tool for chip removing machining, including a long narrow basic body having an envelope surface which is concentric with a center axis, and two opposite ends, and a replaceable loose top which is connected to the basic body via a first coupling that includes a first seating formed in one end of the basic body and a first male element formed in one end of the loose top. The basic body includes a primary part body made of a first material having a first modulus of elasticity, and a secondary part body which includes the first seating and is made of a second material having a second modulus of elasticity which is lower than the first modulus of elasticity.
    Type: Grant
    Filed: May 22, 2008
    Date of Patent: May 11, 2010
    Assignee: Sandvik Intellectual Property AB
    Inventors: Ralf Lehto, Magnus Örtlund, Isak Kakai
  • Publication number: 20100014928
    Abstract: A cutting tool, and a loose top therefore, includes two parts detachably connected to each other via a threaded joint in which co-operating male and female threads are included in the form of helicoidal ridges. The profile shape of each helicoidal ridge is defined by a top and two flanks, which delimit a helicoidal groove having a bottom. The first flank is inclined in relation to a center axis of the tool at a first angle that is smaller than a second angle of the second flank in relation to the center axis. Accordingly, the thread ridge is reinforced in comparison with thread ridges having a symmetrical profile shape, whereby larger tensile forces than compressive forces can be applied to the threaded joint while avoiding damage to the thread ridges.
    Type: Application
    Filed: September 17, 2009
    Publication date: January 21, 2010
    Applicant: SANDVIK INTELLECTUAL PROPERTY AB
    Inventors: Isak KAKAI, Ralf LEHTO, Kenneth LARSSON, Magnus ÖRTLUND
  • Patent number: 7611311
    Abstract: A cutting tool, and a loose top therefore, includes two parts detachably connected to each other via a threaded joint in which co-operating male and female threads are included in the form of helicoidal ridges. The profile shape of each helicoidal ridge is defined by a top and two flanks, which delimit a helicoidal groove having a bottom. The first flank is inclined in relation to a center axis of the tool at a first angle that is smaller than a second angle of the second flank in relation to the center axis. Accordingly, the thread ridge is reinforced in comparison with thread ridges having a symmetrical profile shape, whereby larger tensile forces than compressive forces can be applied to the threaded joint while avoiding damage to the thread ridges.
    Type: Grant
    Filed: April 19, 2007
    Date of Patent: November 3, 2009
    Assignee: Sandvik Intellectual Property AB
    Inventors: Isak Kakai, Ralf Lehto, Kenneth Larsson, Magnus Örtlund
  • Publication number: 20080304923
    Abstract: A tool for chip removing machining, including a long narrow basic body having an envelope surface which is concentric with a center axis, and two opposite ends, and a replaceable loose top which is connected to the basic body via a first coupling that includes a first seating formed in one end of the basic body and a first male element formed in one end of the loose top. The basic body includes a primary part body made of a first material having a first modulus of elasticity, and a secondary part body which includes the first seating and is made of a second material having a second modulus of elasticity which is lower than the first modulus of elasticity.
    Type: Application
    Filed: May 22, 2008
    Publication date: December 11, 2008
    Applicant: Sandvik Intellectual Property AB
    Inventors: Ralf LEHTO, Magnus ORTLUND, Isak KAKAI
  • Patent number: 7419336
    Abstract: An indexable milling insert includes opposite top and bottom sides between which a peripheral clearance surface extends, and two opposite cutting edges formed in the transition between the top side and the clearance surface. Each of the cutting edges includes a substantially straight portion connected with a straight section of the clearance surface, and further includes a curved portion connected with a convexly arched section of the clearance surface. A coupling including one or more male- and/or female-like engagement members is located along said clearance surface. Furthermore, the milling insert may be used with a shim plate for attachment to a milling tool.
    Type: Grant
    Filed: May 24, 2006
    Date of Patent: September 2, 2008
    Assignee: Sandvik Intellectual Property AB
    Inventors: Ralf Lehto, Lars-Gunnar Wallström, Göran Pantzar, Per Blomstedt