Patents by Inventor Ryota Tanase

Ryota Tanase 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).

  • Chattering detection method for machine tool
    Patent number: 9463545
    Abstract: Reference phase variation values ?k1 to ?Kn, each of which is a variation among a plurality of phases that occur during non-machining and phase variation values ?1 to ?n, each of which is a variation among a plurality of phases that occur during machining are detected from measured vibration with the use of a chattering detector that is used to calculate phases of a desired number (n) of frequencies. If ?Ki??i is smaller than a determination value TK, it is determined that chattering having a frequency i is occurring.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: October 11, 2016
    Assignee: JTEKT CORPORATION
    Inventors: Toshiyuki Okita, Ryota Tanase, Shigeru Matsunaga
  • ROTARY TOOL HOLDER
    Publication number: 20150328698
    Abstract: A rotary tool holder is provided which enables effective suppression of possible chattering vibration when a workpiece is machined using a rotary tool. A tool holder that is a rotary tool holder includes a main body that rotates while holding a rotary tool, an additional mass supported by the main body with a radial gap, a fluid path provided in the main body, and a viscoelastic damper configured by a fluid fed to the radial gap between the main body and the additional mass via the fluid path.
    Type: Application
    Filed: April 28, 2015
    Publication date: November 19, 2015
    Applicant: JTEKT CORPORATION
    Inventors: Hisashi Otani, Hiroyuki Nakano, Shigeru Matsunaga, Ryota Tanase
  • Spindle unit
    Patent number: 9011007
    Abstract: A spindle unit includes: a main spindle that holds a rotary tool, and that is rotated; bearings by which the main spindle is rotatably supported; and a damper bearing by which the main spindle is rotatably supported, and that has a damping coefficient larger than damping coefficients of the bearings. The damping coefficient of the damper bearing is set to a value within a range from 10,000 to 1,000,000 N·s/m.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: April 21, 2015
    Assignee: JTEKT Corporation
    Inventors: Shigeru Matsunaga, Toshiyuki Okita, Ryota Tanase
  • MAIN SPINDLE UNIT
    Publication number: 20140360745
    Abstract: A main spindle unit includes: a damper bearing that restricts vibrations of a main spindle by being supplied with a fluid; a fluid supply device that supplies the fluid to the damper bearing, and that is able to adjust a flow rate of the fluid; a vibration detection sensor that detects a vibration of the main spindle; and a controller that adjusts the flow rate of the fluid supplied from the fluid supply device, based on the magnitude of the vibration detected by the vibration detection sensor.
    Type: Application
    Filed: June 4, 2014
    Publication date: December 11, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Shigeru MATSUNAGA, Ryota Tanase
  • SPINDLE UNIT
    Publication number: 20130336603
    Abstract: A spindle unit includes: a main spindle that holds a rotary tool, and that is rotated; bearings by which the main spindle is rotatably supported; and a damper bearing by which the main spindle is rotatably supported, and that has a damping coefficient larger than damping coefficients of the bearings. The damping coefficient of the damper bearing is set to a value within a range from 10,000 to 1,000,000 N·s/m.
    Type: Application
    Filed: June 11, 2013
    Publication date: December 19, 2013
    Inventors: Shigeru Matsunaga, Toshiyuki Okita, Ryota Tanase
  • CHATTERING DETECTION METHOD FOR MACHINE TOOL
    Publication number: 20120232812
    Abstract: Reference phase variation values ?k1 to ?Kn, each of which is a variation among a plurality of phases that occur during non-machining and phase variation values ?1 to ?n, each of which is a variation among a plurality of phases that occur during machining are detected from measured vibration with the use of a chattering detector that is used to calculate phases of a desired number (n) of frequencies. If ?Ki??i is smaller than a determination value TK, it is determined that chattering having a frequency i is occurring.
    Type: Application
    Filed: February 29, 2012
    Publication date: September 13, 2012
    Applicant: JTEKT CORPORATION
    Inventors: Toshiyuki OKITA, Ryota Tanase, Shigeru Matsunaga