| 摘要 |
PURPOSE:To suppress the occurrence of defective machining by completely stopping the operation after predetermined times respectively in the order of the drive stop of an NC device, power feed stop to the NC device, and power feed stop to an NC machine tool when the continuation of an abnormal state for a predetermined time is detected. CONSTITUTION:When abnormalities occur in a machine tool and the first and second abnormality detection sections 7, 9 detect stop signals from an NC device 1 and a control section 5 or an abnormality signal from an operation section 3, a power supply stop signal judgement section 11 applies the drive stop signal of the NC device 1 to the NC device 1 and the first power supply cutoff process section 15 after the predetermined time of a built-in timer in response to these signals. The process section 15 applies the power feed stop signal to the NC device 1 to a power supply switch 17 and the second power supply cutoff process section 19 after the predetermined time of a built-in timer. Then, the process section 19 applies the power feed stop signal to the machine tool to a non-fuse breaker 13 after the predetermined time of a built-in timer. Therefore, the occurrence of defective machining can be suppressed, and the operation is resumed after the causes of the abnormalities have been removed in a predetermined time, thereby the deterioration of productivity can also be suppressed. |
