| 摘要 |
PURPOSE:To detect a breakage/damage of a tool in process and enable the optimum activity at the breakage/damage time by detecting it when the detecting signal of a contact detector is turned off during working operation of a workpiece by means of the tool. CONSTITUTION:High-frequency current supplied from a power source 19 flows through the coil 9 of an exciting coil 7 and high-frequency magnetic field is generated at a core 10. When the tool 4 of a working machine 1 makes contact with a workpiece 5, the high-frequency current H flowing in a loop through a frame 2, a main shaft part 3, the tool 4 and the workpiece 5 is generated by said high-frequency magnetic field. The high-frequency current H generates the high-frequency magnetic field around the core 11 of the detecting core 10 to induce the high-frequency current, which functions as the output signal of the detecting coil 10. A detecting element 20 processes said output signal and receives the detecting signal or the breakage/damage signal. Said breakage or damage signal is connected to the skip input of a CNC controller to interrupt the feeding activity of the tool 4 or the workpiece 5. |
