Patents by Inventor Mitsunari Oda

Mitsunari Oda 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: 10788812
    Abstract: In the present invention: a plurality of meshes are defined on an object surface; the luminance of the object surface when the object surface is viewed from a viewpoint position is calculated for each of the plurality of meshes on the basis of data concerning a processed shape, a surface roughness curve, the viewpoint position, the direction, angle distribution, and intensity of incident light onto the object surface, and a reflectance and scattering characteristics for each wavelength on the object surface; the shape of the object surface is displayed on the basis of the luminances; and data concerning at least the object shape or the surface roughness curve is corrected so as to obtain a desired appearance of the object surface.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: September 29, 2020
    Assignees: NATIONAL UNIVERSITY CORPORATION KOBE UNIVERSITY, MAKINO MILLING MACHINE CO., LTD.
    Inventors: Ryuta Sato, Takumi Nakanishi, Mitsunari Oda, Nobu Nakayama
  • Patent number: 10775166
    Abstract: A shape evaluation method includes a shape error calculation step that calculates a shape error, which is an error between a designed shape and a shape to be evaluated, and a visible error detection step that detects visible shape errors on the basis of the shape error and predetermined visual characteristic data.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: September 15, 2020
    Assignees: NATIONAL UNIVERSITY CORPORATION KOBE UNIVERSITY, MAKINO MILLING MACHINE CO., LTD.
    Inventors: Ryuta Sato, Yuki Sato, Mitsunari Oda, Nobu Nakayama
  • Publication number: 20200192333
    Abstract: A parameter indicating a surface property of an object surface is plotted on the horizontal axis, a normal direction change rate of the shape of the object surface is plotted on the vertical axis, the minimum normal direction change rate visible to a person is associated with the parameter indicating the surface property of the object surface to create a visible area map, the relationship between the parameter indicating the surface property of a machining surface of a workpiece, and the maximum value of the normal direction change rate of the shape of the machining surface of the workpiece is displayed on the visible area map, and the object surface is evaluated.
    Type: Application
    Filed: February 5, 2018
    Publication date: June 18, 2020
    Inventors: Ryuta SATO, Takumi NAKANISHI, Mitsunari ODA, Nobu NAKAYAMA
  • Publication number: 20190361424
    Abstract: In this motion evaluation method, which uses a circular motion test to evaluate motion characteristics of a numerically controlled machine tool, a normal direction change rate of a trajectory is calculated from a circular motion trajectory, the normal direction change rate of the trajectory is displayed in polar coordinates, and the motion characteristics of the numerically controlled machine tool are evaluated.
    Type: Application
    Filed: February 5, 2018
    Publication date: November 28, 2019
    Applicants: NATIONAL UNIVERSITY CORPORATION KOBE UNIVERSITY, MAKINO MILLING MACHINE CO., LTD.
    Inventors: Ryuta SATO, Takumi NAKANISHI, Mitsunari ODA, Nobu NAKAYAMA
  • Patent number: 10437225
    Abstract: A numerically controlled machine tool in which a numerical control program acquired from a reading and interpreting unit of a numerical control device is executed by a distribution interpolating unit and servo control units, to drive a feed shaft configured from a coarse movement mechanism and a fine movement mechanism, causing a tool to move relative to a workpiece, and thereby machining the workpiece, wherein the difference between a movement command for the feed shaft, and an output value which varies on the basis of said movement command is obtained, a movement command for the coarse movement mechanism is generated on the basis of said movement command, and a movement command for the fine movement mechanism is generated on the basis of said difference.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: October 8, 2019
    Assignee: MAKINO MILLING MACHINE CO., LTD.
    Inventor: Mitsunari Oda
  • Patent number: 10274939
    Abstract: Provided is a feed shaft control method, wherein a speed feedback loop having a speed controller is disposed within a position feedback loop having a position controller, forming a cascade coupling, and an acceleration feedback signal which is outputted from a compensator on the basis of an output signal of an acceleration detector is subtracted from a torque instruction. Furthermore, the method implements control wherein a speed is acquired on the basis of the output signal of the acceleration detector, and a signal obtained by multiplying the acquired speed by a gain is added to a speed instruction which is outputted from the position controller.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: April 30, 2019
    Assignee: MAKINO MILLING MACHINE CO., LTD.
    Inventor: Mitsunari Oda
  • Patent number: 10248101
    Abstract: A tool path generation method for generating a second tool path by performing a smoothing process on a first tool path for processing a work with a machine tool includes a change rate calculation step of calculating a curvature change rate of the first tool path at a plurality of moving points (Pn) of the first tool path. The tool path generation method includes: a weight calculation step of calculating a moving average weight on the basis of the curvature change rate of the first tool path at each of the moving points (Pn); and a step of calculating coordinate values of the moving average of the moving points (Pn) using the weight at each of the moving points (Pn), and setting the coordinate values of the moving average of the moving points (Pn) as moving points of the second tool path.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: April 2, 2019
    Assignee: MAKINO MILLING MACHINE CO., LTD.
    Inventors: Mitsunari Oda, Megumi Furuta, Akihiro Shinone, Toshimune Kawai
  • Publication number: 20190064771
    Abstract: In the present invention: a plurality of meshes are defined on an object surface; the luminance of the object surface when the object surface is viewed from a viewpoint position is calculated for each of the plurality of meshes on the basis of data concerning a processed shape, a surface roughness curve, the viewpoint position, the direction, angle distribution, and intensity of incident light onto the object surface, and a reflectance and scattering characteristics for each wavelength on the object surface; the shape of the object surface is displayed on the basis of the luminances; and data concerning at least the object shape or the surface roughness curve is corrected so as to obtain a desired appearance of the object surface.
    Type: Application
    Filed: February 28, 2017
    Publication date: February 28, 2019
    Applicants: NATIONAL UNIVERSITY CORPORATION KOBE UNIVERSITY, MAKINO MILLING MACHINE CO., LTD.
    Inventors: Ryuta SATO, Takumi NAKANISHI, Mitsunari ODA, Nobu NAKAYAMA
  • Patent number: 10018989
    Abstract: A worked surface of a workpiece is evaluated on the basis of how the surface is actually perceived by a person's (observer's) eyes (vision) or fingers (touch), and a work process whereby a workpiece is worked is changed on the basis of the evaluation.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: July 10, 2018
    Assignee: MAKINO MILLING MACHINE CO., LTD.
    Inventor: Mitsunari Oda
  • Publication number: 20170370714
    Abstract: A shape evaluation method according to the present invention comprises: a shape error calculation step that calculates a shape error, which is an error between a designed shape and a shape to be evaluated; and a visible error detection step that detects visible shape errors on the basis of the shape error and predetermined visual characteristic data.
    Type: Application
    Filed: February 2, 2016
    Publication date: December 28, 2017
    Applicants: NATIONAL UNIVERSITY CORPORATION KOBE UNIVERSITY, MAKINO MILLING MACHINE CO., LTD.
    Inventors: Ryuta SATO, Yuki SATO, Mitsunari ODA, Nobu NAKAYAMA
  • Patent number: 9829879
    Abstract: A tool path is generated with procedures that include: one of the processing points (Pi) on a multiple rows of tool paths (PA) obtained by connecting multiple prescribed processing points sequentially with straight lines is set as a revision processing point (Pt), points on the multiple rows of tool paths are set as distance calculation points (Pu), and the distance (L) from the revision processing point (Pt) to each of the distance calculation points (Pu) is calculated; the distance calculation points (Pu?) for which the distance (L) is within a prescribed value (?L) are extracted; the mean values of the position data for the distance calculation points (Pu?) and the position data for the revision processing point (Pt) are calculated; and the position data is revised by means of the mean values, and a new tool path (PA?) is created.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: November 28, 2017
    Assignee: Makino Milling Machine, Co., Ltd.
    Inventors: Masashi Tanuma, Mitsunari Oda, Takashi Komori, Takahiro Yoshimura
  • Publication number: 20170300029
    Abstract: A tool path generation method for generating a second tool path by performing a smoothing process on a first tool path for processing a work with a machine tool includes a change rate calculation step of calculating a curvature change rate of the first tool path at a plurality of moving points (Pn) of the first tool path. The tool path generation method includes: a weight calculation step of calculating a moving average weight on the basis of the curvature change rate of the first tool path at each of the moving points (Pn); and a step of calculating coordinate values of the moving average of the moving points (Pn) using the weight at each of the moving points (Pn), and setting the coordinate values of the moving average of the moving points (Pn) as moving points of the second tool path.
    Type: Application
    Filed: October 29, 2014
    Publication date: October 19, 2017
    Applicant: MAKINO MILLING MACHINE CO., LTD.
    Inventors: Mitsunari ODA, Megumi FURUTA, Akihiro SHINONE, Toshimune KAWAI
  • Patent number: 9785139
    Abstract: A working machine feed axis control device: disposes a velocity feedback loop and forms a cascade coupling on the inner side of a location feedback loop; comprises a velocity gain setting apparatus (30) which multiplies the output of the velocity feedback look by a first gain (kv), and a location gain setting apparatus (31) which multiplies the output of the location feedback loop by a second gain (kp); subtracts the output of the velocity gain setting apparatus (30) and the output of the location gain setting apparatus (31) from a torque instruction (?); and outputs the remaining torque instruction (?) to a subject to be controlled (27).
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: October 10, 2017
    Assignee: MAKINO MILLING MACHINE CO., LTD.
    Inventor: Mitsunari Oda
  • Publication number: 20170220023
    Abstract: A numerically controlled machine tool in which a numerical control program acquired from a reading and interpreting unit of a numerical control device is executed by a distribution interpolating unit and servo control units, to drive a feed shaft configured from a coarse movement mechanism and a fine movement mechanism, causing a tool to move relative to a workpiece, and thereby machining the workpiece, wherein the difference between a movement command for the feed shaft, and an output value which varies on the basis of said movement command is obtained, a movement command for the coarse movement mechanism is generated on the basis of said movement command, and a movement command for the fine movement mechanism is generated on the basis of said difference.
    Type: Application
    Filed: September 30, 2014
    Publication date: August 3, 2017
    Applicant: MAKINO MILLING MACHINE CO., LTD.
    Inventor: Mitsunari ODA
  • Publication number: 20170083007
    Abstract: Provided is a feed shaft control method, wherein a speed feedback loop having a speed controller is disposed within a position feedback loop having a position controller, forming a cascade coupling, and an acceleration feedback signal which is outputted from a compensator on the basis of an output signal of an acceleration detector is subtracted from a torque instruction. Furthermore, the method implements control wherein a speed is acquired on the basis of the output signal of the acceleration detector, and a signal obtained by multiplying the acquired speed by a gain is added to a speed instruction which is outputted from the position controller.
    Type: Application
    Filed: March 14, 2014
    Publication date: March 23, 2017
    Applicant: MAKINO MILLING MACHINE CO., LTD
    Inventor: Mitsunari ODA
  • Patent number: 9588509
    Abstract: A stick motion correction method which corrects stick motion which occurs at time of reversal of a feed axis of a numerical control machine tool stores a position command to be commanded to a servo motor from an NC program of a numerical control machine tool for each predetermined control period from a current position command to a later position command, calculates a reversal correction command based on the stored position commands, calculates an advancement time for advancing timing of addition of the reversal correction command to a speed or torque command of the motor from reversal timing of the servo motor, based on information obtained from operation of the motor and adds the reversal correction command to the speed or torque command of the servo motor to precisely correct stick motion at a timing advanced from the reversal timing of the servo motor by an exact time.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: March 7, 2017
    Assignee: MAKINO MILLING MACHINE CO., LTD.
    Inventors: Akira Kawana, Norio Mori, Mitsunari Oda
  • Patent number: 9477218
    Abstract: A numerical control device which controls a feed axis of a machine tool has a storage unit which divides a range of movement of the feed axis into a plurality of regions and stores a plurality of control parameters corresponding to the divided plurality of regions in advance, a position detection unit which detects a position of a feed axis at the time of machining a workpiece, a parameter selection unit which reads out control parameters corresponding to a divided region to which the detected feed axis position at the time of machining a workpiece belongs, and a servo control unit which controls the feed axis using the read control parameters. Due to this, it is possible to provide a numerical control method of a machine tool which realizes stable machining precision without regard as to the feed axis position and a numerical control device which conducts that method.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: October 25, 2016
    Assignee: Makino Milling Machine Co., Ltd.
    Inventors: Akira Kawana, Norio Mori, Mitsunari Oda
  • Patent number: 9360849
    Abstract: In this numerical control method that drives the feed shaft of a machine tool (10) by means of a servo control unit (52), a transmission function is determined by modeling the operation of the servo control unit (52) of the feed shaft, the closed loop transmission function (GBP) of the position loop and/or the closed loop transmission function of the velocity loop of the servo control unit (52) of the machine tool is measured using the frequency response of the feed shaft, the control subject (PP) of the position loop and/or the control subject of the velocity loop is determined using the measured closed loop transmission function, the position loop modeling error (?PP) and/or the velocity loop modeling error is determined from the control subject, and at least one control parameter of the servo control unit (52) is calculated using the closed loop transmission function and/or the modeling error.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: June 7, 2016
    Assignee: Makino Milling Machine Co., Ltd.
    Inventors: Akira Kawana, Norio Mori, Mitsunari Oda
  • Publication number: 20160054724
    Abstract: A worked surface of a workpiece is evaluated on the basis of how the surface is actually perceived by a person's (observer's) eyes (vision) or fingers (touch), and a work process whereby a workpiece is worked is changed on the basis of the evaluation.
    Type: Application
    Filed: March 29, 2013
    Publication date: February 25, 2016
    Applicant: MAKINO MILLING MACHINE CO., LTD.
    Inventor: Mitsunari ODA
  • Publication number: 20160004248
    Abstract: A working machine feed axis control device: disposes a velocity feedback loop and forms a cascade coupling on the inner side of a location feedback loop; comprises a velocity gain setting apparatus (30) which multiplies the output of the velocity feedback look by a first gain (kv), and a location gain setting apparatus (31) which multiplies the output of the location feedback loop by a second gain (kp); subtracts the output of the velocity gain setting apparatus (30) and the output of the location gain setting apparatus (31) from a torque instruction (?); and outputs the remaining torque instruction (?) to a subject to be controlled (27).
    Type: Application
    Filed: February 28, 2014
    Publication date: January 7, 2016
    Applicant: MAKINO MILLING MACHINE CO., LTD.
    Inventor: Mitsunari ODA