| 摘要 |
PURPOSE:To stop the rotary motion of grinding tool driving and table feed operating motors at abnormal time and prevent damage to surfaces of a metal mold, by deciding presence of an abnormal state in accordance with the level of a voltage signal from a grinding tool displacement detector which shows whether it is above or below a certain value. CONSTITUTION:To the point of a grinding head 7 a grinding tool 1 is mounted, then said head 7 is vertically moved by a hydraulic cylinder 20. The head 7 operates self guide profiling work in such a manner that the tool 1 is always constantly loaded. While, to the head 7 a displacement detector is mounted to obtain a displacement detector output signal. A servo controller 22 is for controlling grinding load at constant by the signal from a detector 23, while a controller 24 receives a signal from the detector 23. The controller 24 makes a decision of presence of an abnormal state and stops, in case of a decision of abnormality, a tool driving motor M1 and table feed operating motor M2, thus accurate grinding work can be performed without causing a flaw on any surface of a metal mold. |
