| 摘要 |
PURPOSE:To confirm the breakage of a tool by detecting that the contact of a tool with an object to be machined is unable to be obtained practically at the same time as the time of contact which is obtained by a numerically controlling device when the breakage of tool is detected by an AE (acoustic emission) signal. CONSTITUTION:When a tool breakage detected signal is given to a CPU9 via an AE signal processing part 7 and through an I/O interface 8, the signal is transmitted to a numerically controlling device 3 via a signal transmitting line 15, to stop the operation of a tool 2 and temporarily separate the tool 2 from a workpiece 1 to a sufficient distance. After that, recontact timing data until the tool 2 reaches the end of the workpiece 1 again, are transmitted to a tool breakage detecting device, to move the tool 2 again to the workpiece 1 at a defined speed. The time for the end of the tool 2 to be brought in contact with the workpiece 1, is calculated and, when difference between the time of recontact timing of the tool 2 and the actual contact time is other than a time in tolerance, the breakage of the tool 2 is confirmed. |
