| 摘要 |
PROBLEM TO BE SOLVED: To provide a plasma torch life duration detecting device that aims at detecting a life duration of a plasma torch, detecting a life duration of a plasma torch in accordance with a requested processing precision, and detecting contact between a nozzle protection cover and a workpiece at a lower cost. SOLUTION: The plasma torch life duration detecting device is typically constructed in such a manner that a nozzle member 3 having an electrical conductivity is disposed outside of an electrode to maintain electrical insulation against the electrode, and a nozzle protection cover 4 having an electrical conductivity is disposed outside of the nozzle member 3 to maintain electrical insulation against the nozzle member 3. The device is characterized in that it is provided with a voltmeter 7 disposed between the nozzle member 3 and the nozzle protection cover 4, for detecting a voltage between the nozzle member 3 and the nozzle protection cover 4, and that the life duration of the plasma torch (electrode 2, nozzle member 3, nozzle protection cover 4) is detected by use of the voltage detected by the voltmeter 7. COPYRIGHT: (C)2006,JPO&NCIPI
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