Foreign matter detection device which detects penetration of foreign matter into interior of electric motor arranged in machine tool
AssigneeFanuc Corporation
InventorKoudai Akashi
Life of this patent
Estimating the term…
Abstract
A foreign matter detection device includes an ion sensor arranged in the interior of a feed axis motor. The ion sensor is formed so as to detect an ion contained in a cutting liquid. A machine controller judges whether an ion concentration is within a judgment range related to the cutting liquid based on output of the ion sensor, and judges that the cutting liquid has penetrated into the interior of the feed axis motor when the ion concentration is within the judgment range related to the cutting liquid.
Claims11
A foreign matter detection device configured to detect penetration of a foreign matter into an interior of an electric motor in a machine tool, the device comprising:
- a sensor in the interior of the electric motor;
- a controller configured to judge whether the foreign matter penetrates into the interior of the electric motor based on an output of the sensor, wherein
- the sensor is configured to detect a physical property of the foreign matter, and the controller is configured to:
- store information on the physical property of the foreign matter in a storage medium in the device, and
- judge the penetration of the foreign matter and a type of the foreign matter by comparing the output of the sensor with the information on the physical property of the foreign matter, wherein
- the machine tool machines a workpiece having magnetic property,
- the sensor is a proximity sensor configured to detect an object having magnetic property approaching the sensor,
- the information on the physical property of the foreign matter is a judgment range of distance between the object and the proximity sensor, and
- the controller is further configured to judge whether the object approaches to within the judgment range of distance based on an output of the proximity sensor, and judge that swarf generated during machining of the workpiece has penetrated into the interior of the electric motor in response to the object approaching to be within the judgment range of distance.
A foreign matter detection device configured to detect penetration of a foreign matter into an interior of an electric motor in a machine tool, the device comprising:
- a sensor in the interior of the electric motor;
- a controller configured to judge whether the foreign matter penetrates into the interior of the electric motor based on an output of the sensor, wherein
- the sensor is configured to detect a physical property of the foreign matter, and the controller is configured to:
- store information on the physical property of the foreign matter in a storage medium in the device, and
- judge the penetration of the foreign matter and a type of the foreign matter by comparing the output of the sensor with the information on the physical property of the foreign matter, wherein
- the sensor is a pH sensor detecting a pH value,
- the information on the physical property of the foreign matter is a pH value judgment range related to a cutting liquid and a pH value judgment range related to a lubricant,
- the judgment range related to the cutting liquid is a range that does not overlap with the judgment range related to the lubricant, and
- the controller is further configured to judge whether the pH value is within the judgment range related to the cutting liquid or is within the judgment range related to the lubricant based on an output of the pH sensor, and judge that the cutting liquid has penetrated into the interior of the electric motor in response to the pH value being within the judgment range related to the cutting liquid, and judge that the lubricant has penetrated into the interior of the electric motor in response to the pH value being within the judgment range related to the lubricant.
Dependencies are inferred from the claim text.