| 摘要 |
In a cutting device, the flow rate of supplied cooling water is adjusted in response to a cutting load. In the cutting device, a spindle (1) includes: a spindle motor (3); a rotational axis (4); a rotating blade (8); and a cooling water path (7). A displacement sensor (10) is arranged at a position facing a flange (9). A current measuring means (12) for measuring a driving current is connected to the spindle motor (3). A flow rate adjusting means (13) for adjusting the flow rate of cooling water is connected to the cooling water path (7). The measured value [I(t)] of a current value measured by the current measuring means (12) is compared with the memorized value of the current value memorized in advance. If the measured value [I(t)] is greater than the memorized value (I0), cooling water is supplied to the spindle (1) at a predetermined flow rate. If the measured value [I(t)] is equal to or smaller than the memorized value (I0), cooling water is supplied at a reduced flow rate. Therefore, the flow rate of supplied cooling water is adjusted in response to the size of the load current of the spindle motor (3). The amount of used cooling water is reduced as cooling water is supplied to the spindle (1) at an appropriate flow rate. |
