| 摘要 |
PURPOSE:To promote the efficiency and accuracy of machining, by providing an adaptive controller for automatically adjusting an override on the basis of the output signal of an ultrasonic detector attached to a machine tool or a workpiece, to heighten the sensitivity to the cutting load. CONSTITUTION:When a machine tool 1 has started cutting, an AE signal generated by an AE sensor 41 is caught and applied to an adaptive controller 51, which judges the percentage of an override to the level of the AE signal (ultrasonic signal) and applies the percentage to the machine tool to adaptively control it. When the state of exceeding of a machine tool stop line with an increase in the level of the AE signal has lasted for t seconds, a cutting tool is regarded as broken and the machine tool 1 is immediately stopped. If the level of the AE signal is not higher than a standard, the cutting tool is regarded as cutting the air, the override percentage is set at 150-200% and applied to the machine tool 1 to quickly feed the cutting tool. The sensitivity of detecting the load upon the tool is thus heightened to perform cutting under optimal load to promote the efficiency and accuracy of machining. |
