Thk Co., Ltd.

Other

Disco Corporation

Yoshiyuki Honjo

Shuhei Yamanaka

Kaoru Hoshide

Katsuya Iida

Ryuji Furusawa

Ayako Miyajima

Toshiro Tojo

Satoshi Takahashi

Hirotugu Kinoshita

Satoru Nagai

Kiyomi Sakamoto

Takeo Yoshioka

Shigeo Watanabe

Masatomo Tokuno

Takuya Sakamoto

Hiroshi Inoko

Yoshio Taki

Hiroshi Funahashi

Tomonori Kaneko

An abnormality diagnosis system that diagnoses an abnormality related to each control shaft in equipment in which the plurality of control shafts, each including a motor and an output unit driven by the motor, are incorporated, includes: a plurality of vibration sensors that are provided for the plurality of control shafts, respectively, and that detect vibration occurring in connection with driving of the motor corresponding to each control shaft; a calculation unit that calculates, for each of the plurality of control shafts, vibration levels in a plurality of predetermined frequency ranges, based on vibration information detected by each of the plurality of vibration sensors; and a diagnosis unit that diagnoses an abnormality related to each control shaft, based on a distribution state, across the plurality of predetermined frequency ranges and across the plurality of control shafts, of the vibration levels calculated by the calculation unit.

Abnormality diagnosis system and abnormality diagnosis method

An object of the present invention is to preferably detect the failure accompanied with the decrease in the pre-load in a ball screw unit. The failure diagnosis is performed for the ball screw unit on the basis of a combination of a resonance frequency in an axial direction of a predetermined machine assembly including the ball screw unit and a motor and a position of a nut member on a screw shaft corresponding to the resonance frequency as provided when the screw shaft is driven and rotated by the motor.

Diagnosis system for ball screw unit and motor control system

Provided is a diagnosis method of appropriately recognizing a state of a rolling surface of a track member of a rolling guide device or a lubrication state of rolling elements using a sensor mounted to the rolling guide device. The diagnosis method is applied to a rolling guide device including: a track member having a rolling surface extending along a longitudinal direction of the track member; and a moving member, which is assembled to the track member through intermediation of a plurality of rolling elements configured to roll on the rolling surface so that the moving member is movable along the track member, and has an endless circulation path for the rolling elements. The diagnosis method includes: detecting a moving speed of the moving member relative to the track member while detecting relative vibration displacement of the moving member relative to the track member using a vibration sensor mounted to the moving member; and diagnosing a running state of the moving member relative to the track member based on those detection results.

Method for diagnosing state of rolling guide device

A fault detection sensor-equipped actuator is provided which can easily detect a fault in at least one of a linear guide unit and a ball screw unit, using a shared sensor. In an actuator () including a linear guide unit () that guides linear movement of a movable body () and a ball screw unit () that drives the movable body () in an axial direction of a screw shaft (), a sensor () configured to detect a fault in the actuator () is placed in a housing () where a coupling () that couples the screw shaft () and a motor () for rotating the screw shaft () is housed.

Fault detection sensor-equipped actuator and method for detecting fault in actuator

Provided is a state diagnosis system, which is applied to a rolling guide device in which a moving member including an endless circulation path for rolling elements is freely movable along a track member, and which is configured to appropriately recognize a state of a rolling surface of the track member. The state diagnosis system includes: a sensor configured to detect a physical quantity exhibited when the moving member is moving along the track member; a signal processing unit configured to process an output signal from the sensor to output analysis data; and a determination processing unit configured to compare the analysis data with threshold value data to determine whether or not the rolling guide device has an abnormality. Further, when a cycle at which each of the rolling elements, which moves back and forth in the endless circulation path, enters a loadpath from a no-loadpath is represented by t, a data collection time period T, for which the signal processing unit takes in the output signal from the sensor, is set to satisfy T&#x2265;t.

Condition diagnosing system for rolling guide device

Provided is a rolling guide device which is capable of directly recognizing an operation condition of a moving member with respect to a track member or a circulation state of rolling elements in an endless circulation path, the rolling guide device including: a track member having a rolling surface; and a moving member, which is assembled to the track member through intermediation of a large number of rolling elements which roll on the rolling surface, and has an endless circulation path for the rolling elements, the moving member including: a main body member having a load rolling surface and a no-load return path for the rolling elements, the load rolling surface being opposed to the rolling surface of the track member to define a load path for the rolling elements, a pair of covers, which have direction change paths for allowing the rolling elements to move between the load path and the no-load return path, and is mounted to the main body member; and a measurement plate, which is interposed at least between the main body member and one cover to form part of the endless circulation path, and has a mounting portion for a sensor configured to detect an operation condition of the moving member with respect to the track member.

Rolling guide device

A state detecting apparatus S for detecting a current operating state of an LM (linear motion) system includes an AE sensorgenerating a detection signal Sae by detecting an AE wave elastically generated when a plurality of balls contained in the LM system revolve in a circulation portion while spinning themselves; and a signal processing unitgenerating a parameter indicating an intensity of the AE wave based on only the detection signal Sae corresponding to an operating frequency of the ball, and uses the parameter to determine a lubrication state of the LM system. Thereby, it is possible to provide the state detecting apparatus capable of predicting failure occurrence in the LM system; providing an improved maintenance to a user of the LM system and further longer lifetime thereof; and providing a performance guarantee and an improved quality of a device or equipment manufactured using the LM system.

State detection device, state detection method, state detection program, and information recording medium

A condition detection apparatus comprising an AE sensorthat detects AE waves, which elastically-occur when a plurality of balls included in an LM system self-rotate and revolve within a circulation section at the same time, and generates detection signals Sae, and a signal processing unitthat generates a first parameter indicating an intensity of the AE waves based on the generated detection signals Sae, generates based on the detection signals Sae a second parameter by weighting only detection signals Sae temporally-continuously detected among the detection signals Sae, generates based on the detection signals Sae a third parameter by weighting only detection signals Sae temporally-discontinuously detected in correspondence with the movement of the balls among the detection signals Sae, and judges contents of an operational condition of the LM system using any one of the first, second or third parameter, is provided to enable prognosis of occurrences of failures in the LM system, to improve maintainability for a user of the LM system, and to contribute to the prolonging of the operation life of the LM system as well as performance assurance and quality improvement of apparatuses or devices incorporated with the LM system.

Condition detection apparatus, condition detection method, condition detection program, information recording medium therefor, and condition display apparatus, condition display method, condition display program, information recording medium therefor

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Tokyo, Japan

Yoshiyuki Honjo