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US 12,276,975 B2Granted
Abnormality detecting device, abnormality detecting method, and storage medium
AssigneeOMRON Corporation
InventorsKazuhiro Takeda, Shota Sakashita, Naoya Hashimoto
Life of this patent
Estimating the term…
Abstract
An abnormality in a device of interest is detected on the basis of the distance from a predetermined reference curve to a point represented by a first index value and a second index value in a two-dimensional plane having the first index and the second index as axes.
Claims11
An abnormality detecting device which detects an abnormality of a target device having a servomotor, a press tool, a load cell, and a displacement sensor, the abnormality detecting device comprising:
- a processor, configured to:
- initialize an abnormality detection flag at a start time of series of machining operations using the servomotor or the press tool;
- acquire a first index value associated with a first index by using the displacement sensor to measure a position of the servomotor or a position of the press tool, and acquire a second index value associated with a second index in the machining operations of the target device by using the load cell to measure a load applied to the servomotor or the press tool, wherein the first index value is a value related to a stage of the machining operation of the servomotor or the press tool, and the second index value is a value related to a load of the machining operation of the the servomotor or the press tool;
- and
- detect an abnormality of the servomotor or the press tool based on a distance from a predetermined reference curve to a point indicated by the first index value and the second index value on a two-dimensional plane with the first index and the second index being axes, comprising to:
- acquire a first ideal value and a second ideal value respectively corresponding to the first index value and the second index value from the predetermined reference curve;
- calculate a distance from the predetermined reference curve to a point indicated by the first index value and the second index value based on the first index value, the second index value, the first idea value, and the second ideal value;
- switch a sign of positive and negative assigned to the distance according to whether the second index value is on a side with a large load or a side with a small load with respect to the reference curve;
- detect the abnormality of the target device based on the distance assigned with the sign;
- count up the abnormality detection flag by one for each detected abnormality of the target device;
- and
- determine that occurrence of the abnormality during the machining operations of the servomotor or press tool when a number flag is greater than a predetermined threshold.
9 more elements
An abnormality detecting method executed in an abnormality detecting device which detects an abnormality of a target device having a servomotor, a press tool, a load cell, and a displacement sensor, the abnormality detecting method comprising:
- initializing an abnormality detection flag at a start time of series of machining operations using the servomotor or the press tool;
- acquiring a first index value associated with a first index by using the displacement sensor to measure a position of the servomotor or a position of the press tool, and a second index value associated with a second index in the machining operations of the target device by using the load cell to measure a load applied to the servomotor or the press tool, wherein the first index value is a value related to a stage of the machining operation of the servomotor or the press tool, and the second index value is a value related to a load of the machining operation of the servomotor or the press tool;
- and
- detecting an abnormality of the servomotor or the press tool based on a distance from a predetermined reference curve to a point indicated by the first index value and the second index value on a two-dimensional plane with the first index and the second index being axes comprising:
- acquiring a first ideal value and a second ideal value respectively corresponding to the first index value and the second index value from the predetermined reference curve;
- calculating a distance from the predetermined reference curve to a point indicated by the first index value and the second index value based on the first index value, the second index value, the first idea value, and the second ideal value;
- switching a sign of positive and negative assigned to the distance according to whether the second index value is on a side with a large load or a side with a small load with respect to the reference curve;
- detecting the abnormality of the target device based on the distance assigned with the sign
- counting up the abnormality detection flag by one for each detected abnormality of the target device;
- and
- determining that occurrence of the abnormality during the machining operations of the servomotor or press tool when a number flag is greater than a predetermined threshold.
8 more elements
Dependencies are inferred from the claim text.