| 摘要 |
PROBLEM TO BE SOLVED: To provide a state monitoring device which decreases adverse effect to a sensor ability due to cutting liquid or impurities incorporated to the cutting liquid and can detect the deterioration of the cutting liquid on an early stage.SOLUTION: Cutting liquid is repeatedly used and is ejected to an area on which an object to be processed is cut. An odor sensor for detecting odor is arranged in a space surrounded by a liquid level and a cover on an upper part of the liquid surface of a processing liquid tank for storing the cutting liquid. The deterioration of the cutting liquid is detected based on the odor detected by the odor sensor. The adverse effect to processing due to the deterioration of the cutting liquid can be prevented beforehand. An operator can cope with the adverse effect before sensing the odor and can keep an operation environment comfortably. The odor sensor is arranged on an upper space of the cutting liquid level, therefore, hardly receives the adverse effect from the cutting liquid or the impurities incorporated in the cutting liquid, hardly causes the deterioration of the sensor ability and can detect incorporation of the impurities into the cutting liquid and corrosion of the cutting liquid exactly on an early stage.SELECTED DRAWING: Figure 1 |
