Patents by Inventor Atsushi Itokazu

Atsushi Itokazu 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: 20240326145
    Abstract: A multiwire electric discharge machine includes: a plurality of guide rollers; a machining power supply that applies a voltage between each of a plurality of cutting wire sections and a workpiece; a dummy workpiece including a contact surface curved in such a way as to be capable of coming into contact with a curved surface of the workpiece except for an end point, the end point being to be reached by each of the plurality of cutting wire sections when machining of the workpiece is completed, the dummy workpiece supporting the workpiece from one side in a first direction, the first direction being a direction in which the workpiece moves; and a pressing mechanism including a pressing portion, the pressing mechanism pressing the workpiece against the dummy workpiece by bringing the pressing portion into contact with the workpiece from another side in the first direction.
    Type: Application
    Filed: March 24, 2022
    Publication date: October 3, 2024
    Applicant: Mitsubishi Electric Corporation
    Inventors: Atsushi ITOKAZU, Yoichi OTOMO, Tsubasa YAGI
  • Patent number: 11826845
    Abstract: A multi-wire electric discharge machine includes: a plurality of cutting wire sections arranged in parallel in such a way as to face a workpiece, a wire electrode being wound around guide rollers to form the cutting wire sections; a drive unit that adjusts relative distances between the workpiece and the cutting wire sections; a machining power supply that applies pulse voltages between the workpiece and the cutting wire sections; a machining-state detection device that detects machining states in the cutting wire sections; and a machining control device that controls the drive unit and the machining power supply, in which when values indicating the machining states exceed a threshold value, the machining control device outputs, to the machining power supply, commands to apply the pulse voltages according to a machining condition for avoiding breakage of the wire electrode.
    Type: Grant
    Filed: April 12, 2021
    Date of Patent: November 28, 2023
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Atsushi Itokazu
  • Publication number: 20230311225
    Abstract: A multi-wire electric discharge machine includes: a plurality of cutting wire sections arranged in parallel in such a way as to face a workpiece, a wire electrode being wound around guide rollers to form the cutting wire sections; a drive unit that adjusts relative distances between the workpiece and the cutting wire sections; a machining power supply that applies pulse voltages between the workpiece and the cutting wire sections; a machining-state detection device that detects machining states in the cutting wire sections; and a machining control device that controls the drive unit and the machining power supply, in which when values indicating the machining states exceed a threshold value, the machining control device outputs, to the machining power supply, commands to apply the pulse voltages according to a machining condition for avoiding breakage of the wire electrode.
    Type: Application
    Filed: April 12, 2021
    Publication date: October 5, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventor: Atsushi ITOKAZU
  • Publication number: 20230241698
    Abstract: An apparatus includes one wire electrode wound multiple times around a plurality of guide rollers to form a parallel wire part in which a plurality of wire cutting parts are arranged in parallel, a discharge waveform control device that controls an interpolar voltage waveform based on a discharge waveform command, and a wire running control device that controls running of the wire electrode based on a wire electrode running command. Further, there is a cutting stage drive device that controls a relative position between the parallel wire part and the workpiece based on a stage command, a machining state acquisition section that acquires a cutting part electrical characteristic or electrode state information as machining state information, and a machining control device that determines the wire electrode running command, the discharge waveform command, and the stage command based on the machining state information.
    Type: Application
    Filed: September 10, 2020
    Publication date: August 3, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hidetaka MIYAKE, Atsushi ITOKAZU
  • Publication number: 20230065726
    Abstract: A multiwire electric discharge machine includes: a machining power source that applies a machining pulse voltage between a workpiece and a cutting wire section; and a wire breakage detection unit that detects breakage of a wire electrode. The wire breakage detection unit is electrically connected in parallel to a wire electrode portion stretched over a section from one location on the feeding side of the wire electrode to one location on the ejection side of the wire electrode, and the wire breakage detection unit includes: a wire breakage detection circuit in which a wire breakage detection power source constantly supplying direct current to the wire electrode portion at least while the workpiece is undergoing a cutting process and a current limiting resistor are connected in series; and a wire breakage determination unit that determines breakage of the wire electrode based on current flowing through the current limiting resistor.
    Type: Application
    Filed: March 18, 2020
    Publication date: March 2, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventor: Atsushi ITOKAZU
  • Patent number: 10220459
    Abstract: To perform highly accurate cutting according to stable power feed from a machining power supply, a wire electric discharge machining apparatus includes a wire wound over main guide rollers a plurality of times to simultaneously perform a plurality of kinds of cutting. Wire laying work for a plurality of the wires on power feed elements is reduced, uniform power is fed to cutting wire sections, stable machining is intended, and according to alignment positions, for each of units, a plurality of the power feed elements are aligned to correspond to a wire parallel arrangement interval of the cutting wire sections set as power feed targets and are disposed to feed power to the cutting wire sections with an interval of at least every other cutting wire section.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: March 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hidetaka Miyake, Atsushi Itokazu, Takashi Hashimoto
  • Patent number: 9833854
    Abstract: A workpiece retainer retains a workpiece at a time of a cutting process by a wire electric discharge machining device that cuts a workpiece by electric discharge from wire electrodes that are spaced from each other and are arranged in parallel. The workpiece retainer is formed with a fitting portion, into which the workpiece is fitted substantially without any gap, and has an external shape such that at a time of cutting the workpiece retainer together with the workpiece fitted in the fitting portion, a length along the wire electrodes of a portion where the workpiece retainer and the workpiece face the wire electrodes becomes substantially constant during the cutting process of the workpiece.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: December 5, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takashi Yuzawa, Hidetaka Miyake, Tatsushi Sato, Atsushi Itokazu
  • Patent number: 9707638
    Abstract: A wire electric-discharge machining device includes a control unit that selects a cutting wire to which a pulse voltage is applied by a pulse-voltage generation unit on a basis of an angle formed between an end face of a workpiece and a plane including a plurality of cutting wires, which are not parallel to the end face, an interval between parallel cutting wires, and a relative distance between the cutting wires and the workpiece. A drive unit drives a workpiece in a direction not vertical to the plane including the cutting wires, and the workpiece is cut by electric-discharge machining by applying a pulse voltage.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: July 18, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Atsushi Itokazu, Hidetaka Miyake
  • Publication number: 20160059338
    Abstract: To perform highly accurate cutting according to stable power feed from a machining power supply, a wire electric discharge machining apparatus includes a wire wound over main guide rollers a plurality of times to simultaneously perform a plurality of kinds of cutting. Wire laying work for a plurality of the wires on power feed elements is reduced, uniform power is fed to cutting wire sections, stable machining is intended, and according to alignment positions, for each of units, a plurality of the power feed elements are aligned to correspond to a wire parallel arrangement interval of the cutting wire sections set as power feed targets and are disposed to feed power to the cutting wire sections with an interval of at least every other cutting wire section.
    Type: Application
    Filed: February 28, 2014
    Publication date: March 3, 2016
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hidetaka MIYAKE, Atsushi ITOKAZU, Takashi HASHIMOTO
  • Patent number: 9089916
    Abstract: A wire electric discharge machining apparatus includes a wire electrode, a guide roller that arranges wire electrodes in parallel by winding the wire electrode therearound, a plurality of slidable contact conductors that are in slidable contact with the wire electrodes arranged in parallel, respectively, and a power feeding jig that holds the slidable contact conductors individually and feeds power individually to the wire electrodes arranged in parallel via each of the slidable contact conductors, in which the power feeding jig includes a plurality of reference surfaces that determine a fixing interval between the slidable contact conductors.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: July 28, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Atsushi Itokazu, Hidetaka Miyake, Tatsushi Sato, Takashi Yuzawa, Kazuhiko Fukushima
  • Publication number: 20150053650
    Abstract: A wire discharge machining apparatus including a plurality of main guide rollers disposed in parallel at intervals, one wire that is wound between the guide rollers while being spaced apart from one another at a fixed pitch to form cutting wire sections between a pair of guide rollers and travels according to the rotation of the main guide rollers, and power feed terminal units that feed electric power to wires of the cutting wire sections. The wire discharge machining apparatus performs cutting of a work piece with the cutting wire sections, suspends cut-out of semiconductor wafers from the work piece in a state in which a part of the semiconductor wafers is connected to the work piece, brings the wires of the cutting wire sections close to one cut surfaces, and scans the cut surfaces in a discharge-machined state.
    Type: Application
    Filed: October 19, 2012
    Publication date: February 26, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hidetaka Miyake, Atsushi Itokazu, Yosuke Nakanishi
  • Publication number: 20140332503
    Abstract: A wire electric-discharge machining device includes a control unit that selects a cutting wire to which a pulse voltage is applied by a pulse-voltage generation unit on a basis of an angle formed between an end face of a workpiece and a plane including a plurality of cutting wires, which are not parallel to the end face, an interval between parallel cutting wires, and a relative distance between the cutting wires and the workpiece. A drive unit drives a workpiece in a direction not vertical to the plane including the cutting wires, and the workpiece is cut by electric-discharge machining by applying a pulse voltage.
    Type: Application
    Filed: December 17, 2012
    Publication date: November 13, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Atsushi Itokazu, Hidetaka Miyake
  • Publication number: 20130140277
    Abstract: A wire electric discharge machining apparatus includes a wire electrode, a guide roller that arranges wire electrodes in parallel by winding the wire electrode therearound, a plurality of slidable contact conductors that are in slidable contact with the wire electrodes arranged in parallel, respectively, and a power feeding jig that holds the slidable contact conductors individually and feeds power individually to the wire electrodes arranged in parallel via each of the slidable contact conductors, in which the power feeding jig includes a plurality of reference surfaces that determine a fixing interval between the slidable contact conductors.
    Type: Application
    Filed: June 14, 2011
    Publication date: June 6, 2013
    Applicant: Mitsubishi Electric Corporation
    Inventors: Atsushi Itokazu, Hidetaka Miyake, Tatsushi Sato, Takashi Yuzawa, Kazuhiko Fukushima
  • Publication number: 20130043217
    Abstract: A workpiece retainer retains a workpiece at a time of a cutting process by a wire electric discharge machining device that cuts a workpiece by electric discharge from wire electrodes that are spaced from each other and are arranged in parallel. The workpiece retainer is formed with a fitting portion, into which the workpiece is fitted substantially without any gap, and has an external shape such that at a time of cutting the workpiece retainer together with the workpiece fitted in the fitting portion, a length along the wire electrodes of a portion where the workpiece retainer and the workpiece face the wire electrodes becomes substantially constant during the cutting process of the workpiece.
    Type: Application
    Filed: March 23, 2011
    Publication date: February 21, 2013
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takashi Yuzawa, Hidetaka Miyake, Tatsushi Sato, Atsushi Itokazu
  • Publication number: 20120312787
    Abstract: An electrical discharge machining apparatus includes a machining electrode that is one wire and includes a plurality of opposing sections with respect to a workpiece by being wound around a plurality of guide rollers, driving units that change a relative distance between the workpiece and the opposing sections, and a plurality of pulse generating units that apply electrical discharge machining pulses between the workpiece and the opposing sections, respectively, in which the pulse generating units are controlled such that application start times of electrical discharge machining pulses for adjacent opposing sections do not coincide with each other.
    Type: Application
    Filed: March 29, 2011
    Publication date: December 13, 2012
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takayuki Nakagawa, Tatsushi Sato, Hidetaka Miyake, Takashi Yuzawa, Atsushi Itokazu