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公开(公告)号：US12013233B2
公开(公告)日：2024-06-18
申请号：US17303725
申请日：2021-06-07
申请人： OKUMA CORPORATION
发明人： Yuji Mizoguchi
摘要： An accuracy diagnostic device that diagnoses an influence on an accuracy of a machine tool due to a thermal deformation includes a temperature change rate calculation unit, an accuracy influence degree calculation unit, and an accuracy stabilization time period calculation unit. The temperature change rate calculation unit calculates a rate of a temperature change in a predetermined portion of the machine tool as a temperature change rate. The accuracy influence degree calculation unit calculates an influence degree on the machine tool accuracy due to the thermal deformation as an accuracy influence degree, based on the temperature change rate. The accuracy stabilization time period calculation unit calculates a time period until the machine tool accuracy is stabilized as an accuracy stabilization time period, based on the temperature change rate.
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公开(公告)号：US12011793B2
公开(公告)日：2024-06-18
申请号：US17021053
申请日：2020-09-15
申请人： OKUMA CORPORATION
发明人： Takumi Hongo
IPC分类号： B23Q15/12
CPC分类号： B23Q15/12
摘要： A main spindle monitoring device determines an abnormality of a main spindle in a machine tool. The main spindle monitoring device includes a main spindle operation monitoring unit and a feed axis operation monitoring unit. The main spindle operation monitoring unit monitors a change of an operation condition of the main spindle based on a main spindle load. The feed axis operation monitoring unit monitors a change of an operation condition of a feed axis based on a feed axis load. The abnormality of the main spindle is determined when the main spindle operation monitoring unit detects the change of the operation condition of the main spindle and the feed axis operation monitoring unit does not detect the change of the operation condition of the feed axis in a state where a constant rotation speed is commanded to the main spindle while the feed axis is driving.
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公开(公告)号：US20240195334A1
公开(公告)日：2024-06-13
申请号：US18527631
申请日：2023-12-04
申请人： OKUMA Corporation
发明人： Satoshi EGUCHI
摘要： A control device, which is configured to control current of a three-phase alternating current motor by d-q axis control, includes a q-axis current controller configured to receive, as one input, an acceleration torque command value τf calculated based on a position command value X, and output a controller output voltage Δeq to be added to a q-axis voltage command value vq*. The q-axis current controller calculates, based on the acceleration torque command value τf, an acceleration q-axis current command value iqf*, which is a current command value corresponding to the acceleration torque command value τf, and adds, to the controller output voltage Δeq, a value obtained by multiplying the acceleration q-axis current command value iqf* by an IP coefficient KIP indicating a ratio of switching between PI control and I-P control and by a q-axis proportional gain Gqp.
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公开(公告)号：US12005569B2
公开(公告)日：2024-06-11
申请号：US16824738
申请日：2020-03-20
申请人： OKUMA Corporation
发明人： Hiroyuki Sugiura
CPC分类号： B25J13/087 , B25J17/02 , B25J19/02 , G01N27/605
摘要： A moisture intrusion detection system includes: an industrial robot that has a closed space defined thereinside; an air supply mechanism that supplies compressed air to the closed space; an air vent passage that is provided in the industrial robot to establish communication between an external space outside the industrial robot and the closed space, and guides, to the external space, air ejected from the closed space upon supply of the compressed air; a humidity sensor that detects a humidity of ejected air that is ejected from the air vent passage to the external space upon supply of the compressed air; and a controller that determines presence or absence of moisture intruding into the closed space based on a detected humidity of the ejected air, the detected humidity being detected by the humidity sensor.
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5.发明授权公开(公告)号：US11989002B2
公开(公告)日：2024-05-21
申请号：US17652758
申请日：2022-02-28
申请人： OKUMA CORPORATION
发明人： Yuji Mizoguchi
IPC分类号： G05B19/4065 , G06N5/04
CPC分类号： G05B19/4065 , G06N5/04 , G05B2219/37428
摘要： An environmental temperature change prediction device includes an environmental temperature acquisition unit, an outside temperature acquisition unit, a plant environment pattern setting unit, a prediction model generating unit, and an environmental temperature change prediction unit. The environmental temperature acquisition unit measures a machine body temperature. The plant environment pattern setting unit defines in advance a classification rule for classifying change trends of the environmental temperature into a plurality of patterns based on data of the environmental temperature and the plant outside temperature and environmental temperature prediction models. The prediction model generating unit selects the applicable plant environment pattern and determines a parameter of the environmental temperature prediction model corresponding to the selected plant environment pattern. The environmental temperature change prediction unit predicts a change in the environmental temperature in a future by the environmental temperature prediction model generated in the prediction model generating unit.
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公开(公告)号：US11988506B2
公开(公告)日：2024-05-21
申请号：US17810883
申请日：2022-07-06
申请人： OKUMA CORPORATION
发明人： Tetsuya Matsushita , Takuya Kojima
摘要： An error identification method includes: installing a calibrator including a sphere row A and a sphere row B in which a plurality of spheres are linearly aligned in a direction perpendicular to the sphere row A on a table such that the sphere row A and the sphere row B are approximately parallel to respective two of the translational axes and measuring positions of a plurality of spheres of the sphere row A and the sphere row B using a position measurement sensor tool; rotating the calibrator to a plurality of angles around a normal direction on the upper surface of the table to install on the table and measuring each position of the plurality of spheres of the sphere row A and the sphere row B; and identifying an error of the translational axis based on measured values in the installing and the rotating.
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公开(公告)号：US20240139895A1
公开(公告)日：2024-05-02
申请号：US18493876
申请日：2023-10-25
申请人： OKUMA CORPORATION
发明人： Yukio GOTO , Satoshi AOYAMA , Hikaru ARAI
IPC分类号： B23Q11/10
CPC分类号： B23Q11/1069
摘要： A cutting fluid circulation device includes a tank reservoir, a drum filter, and a pump. The tank reservoir stores cutting fluid discharged from a machine tool. The drum filter is disposed in the tank reservoir. The drum filter performs as a primary filter that filters cutting fluid. The pump pumps up cutting fluid in the tank reservoir. An annular flow channel in which the cutting fluid filtered by the drum filter circulates is formed in the tank reservoir. A part of the cutting fluid pumped up by the pump is fed to the drum filter, used for cleaning the drum filter, and then returned to the annular flow channel, and a part of the remaining cutting fluid is fed to a secondary filter disposed outside the tank reservoir, filtered by the secondary filter, and then returned to the annular flow channel.
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公开(公告)号：US11841250B2
公开(公告)日：2023-12-12
申请号：US17504962
申请日：2021-10-19
申请人： OKUMA Corporation
发明人： Tatsuru Senyo
CPC分类号： G01D5/24457 , G01D5/248
摘要： An encoder abnormality diagnosis device configured to diagnose an abnormality in an encoder that outputs a cosine waveform and a sine waveform according to a rotation angle of an object includes a stop determination processing unit configured to determine whether the object is rotating or stopping, based on a change in a count value of a pulse signal obtained by pulsing of each of the cosine waveform and the sine waveform, a frequency measurement unit configured to measure a frequency of the pulse signal, and a frequency diagnosis unit configured to compare the frequency measured by the frequency measurement unit with a preset upper limit frequency when the stop determination processing unit determines that the object is stopping, and to determine that an abnormality has occurred in the encoder when the measured frequency exceeds the upper limit frequency.
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公开(公告)号：US20230376003A1
公开(公告)日：2023-11-23
申请号：US18307063
申请日：2023-04-26
申请人： OKUMA CORPORATION
发明人： Takumi HONGO
IPC分类号： G05B19/4065 , G05B19/402 , B23Q15/013 , B23Q17/09
CPC分类号： G05B19/4065 , G05B19/402 , B23Q15/013 , B23Q17/0952
摘要： A feed axis monitoring device includes a position deviation calculating unit, a machined surface perpendicular direction calculating unit, a position deviation component converting unit, a threshold value calculating unit, and an abnormality determining unit. The position deviation calculating unit calculates a position deviation of the feed axis. The machined surface perpendicular direction calculating unit calculates a direction perpendicular to a machined surface at a time of a position deviation calculation. The position deviation component converting unit converts a position deviation of the feed axis into a component in the perpendicular direction. The threshold value calculating unit calculates a threshold value based on a preset relation between an operating state of the main spindle and the threshold value. The abnormality determining unit determines that the feed axis has an abnormality when the position deviation exceeds the threshold value.
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公开(公告)号：US20230347461A1
公开(公告)日：2023-11-02
申请号：US18187323
申请日：2023-03-21
申请人： OKUMA CORPORATION
发明人： Makoto Yoshida
CPC分类号： B23Q3/15513 , B23Q3/15539 , B23Q3/15773 , B23Q2003/15532 , B23Q2003/155421
摘要： Provided is a tool magazine apparatus capable of preventing a phase error in attaching a tool to a tool holding gripper. A tool magazine apparatus includes: a magazine body having both front and rear racks each provided with tool holding grippers; a tool transfer device to take out a tool from the both racks and attach a tool to the both racks; a tool standby pot to hold a tool; and an intra-magazine tool change device to deliver a tool between the tool standby pot and the tool transfer device. The tool transfer device includes: a moving body disposed between the both racks; a base disposed on the moving body and being rotatable around an axis extending in the Z-axis direction; a transfer gripper attached to the base and being movable in a plane orthogonal to the Z-axis direction; and an air cylinder causing the transfer gripper to move.
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