Patents by Inventor Toshihiko Asari

Toshihiko Asari 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: 6922420
    Abstract: A workpiece is irradiated by a laser beam scanned in an oscillating track as the workpiece is advanced along a feed path in a hardening process. Sinusoidal variations in scan velocity are offset by decreasing the laser beam power level at phases in the scanning cycles corresponding to high and low scan displacement peaks, where the scan velocity is least. The beam power is increased near the scanning center line where the scan velocity is highest. The beam energy applied per unit of area is thus equalized over the scanning cycle. The workpiece temperature can be sampled at regular phases by a non-contact temperature sensor in the optical path, and used to control beam power versus phase in a subsequent scanning cycle. Alternatively or in addition, a sinusoidal beam power pattern can be stored and used to offset scan velocity variations as a function of phase.
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: July 26, 2005
    Assignee: Yamazaki Mazak Kabushiki Kaisha
    Inventors: Tsunehiko Yamazaki, Naoomi Miyagawa, Toshihiko Inoue, Toshihiko Asari, Masaaru Matsumura
  • Patent number: 6772041
    Abstract: A nozzle holding means (13) having a nozzle (19) being free to eject laser beam from its top end is provided being free to move along a guide means among a plurality of machine tools. Nozzle holding means operation control means (6, 33) for controlling hardening operation on a workpiece by the nozzle are provided, and communication control means (6, 33) are provided for exchanging information necessary for hardening operation on a workpiece to be machined with each machine tool between the control means and a control means of each machine tool. The nozzle moves among the machine tools and hardening operation is performed on workpieces (29, 30) in the respective machine tools, thereby it is not necessary to provide a hardening unit for exclusive use every each machine tool, and it is possible to provide a hardening equipment having high working ratio.
    Type: Grant
    Filed: May 24, 2002
    Date of Patent: August 3, 2004
    Assignee: Yamazaki Mazak Kabushiki Kaisha
    Inventors: Toshihiko Inoue, Masaki Itoh, Toshihiko Asari, Naoomi Miyagawa
  • Patent number: 6723947
    Abstract: A saddle 18 is movable along a guide means 16 provided, passing through an neighborhood of machining area MA of a plurality of machine tools 1, 2. The saddle 18 is provided with a machining head 33, being free to selectively insert in and retreat from the machining area MA, and a plurality of kinds of nozzles 48 for ejecting laser beam. The nozzle 48 suitable for a portion of workpiece 3, 4 to be hardened is selected so as to attach it to the machining head 33. When hardening is instructed, the nozzle 48 is moved to a desired position with respect to the workpiece 3, 4 in the state of the workpiece 3, 4 located on the machine tool 1, 2, and the laser beam 51 is ejected from the nozzle 48 so as to harden the workpiece 3, 4.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: April 20, 2004
    Assignee: Yamazaki Mazak Kabushiki Kaisha
    Inventors: Toshihiko Inoue, Masaki Itoh, Toshihiko Asari, Naoomi Miyagawa
  • Publication number: 20030080098
    Abstract: In hardening with laser beam by irradiating laser beam. 29 on a workpiece 27, oscillating the laser beam so as to heat a workpiece with a hardening width W1, laser beam output in both end portions (times (1), (5), (6), (10) of FIG. 4, for instance) of amplitude of the laser beam is made lower than one of a center portion (times (3), (4), (7), (8) of FIG. 4, for instance) of the amplitude. Relative moving velocity of the laser beam with respect to workpiece is decreased, and the quantity of giving energy of the laser beam in both end portions of the amplitude where the density of giving energy of laser beam is high is decreased so as to equalize quantity of aiming energy in the whole hardening cycle. By doing so, a proper hardening action is possible.
    Type: Application
    Filed: October 25, 2002
    Publication date: May 1, 2003
    Inventors: Tsunehiko Yamazaki, Naoomi Miyagawa, Toshihiko Inoue, Toshihiko Asari, Masaaru Matsumura
  • Publication number: 20020179581
    Abstract: A nozzle holding means (13) having a nozzle (19) being free to eject laser beam from its top end is provided being free to move along a guide means among a plurality of machine tools. Nozzle holding means operation control means (6, 33) for controlling hardening operation on a workpiece by the nozzle are provided, and communication control means (6, 33) are provided for exchanging information necessary for hardening operation on a workpiece to be machined with each machine tool between the control means and a control means of each machine tool. The nozzle moves among the machine tools and hardening operation is performed on workpieces (29, 30) in the respective machine tools, thereby it is not necessary to provide a hardening unit for exclusive use every each machine tool, and it is possible to provide a hardening equipment having high working ratio.
    Type: Application
    Filed: May 24, 2002
    Publication date: December 5, 2002
    Inventors: Toshihiko Inoue, Masaki Itoh, Toshihiko Asari, Naoomi Miyagawa
  • Publication number: 20020153358
    Abstract: A saddle 18 is movable along a guide means 16 provided, passing through an neighborhood of machining area MA of a plurality of machine tools 1, 2. The saddle 18 is provided with a machining head 33, being free to selectively insert in and retreat from the machining area MA, and a plurality of kinds of nozzles 48 for ejecting laser beam. The nozzle 48 suitable for a portion of workpiece 3, 4 to be hardened is selected so as to attach it to the machining head 33. When hardening is instructed, the nozzle 48 is moved to a desired position with respect to the workpiece 3, 4 in the state of the workpiece 3, 4 located on the machine tool 1, 2, and the laser beam 51 is ejected from the nozzle 48 so as to harden the workpiece 3, 4.
    Type: Application
    Filed: April 15, 2002
    Publication date: October 24, 2002
    Inventors: Toshihiko Inoue, Masaki Itoh, Toshihiko Asari, Naoomi Miyagawa