| 摘要 |
PURPOSE:To perform the regular dull machining by deflecting and shunting an electron beam from a work while the arcing is generated and deflecting the electron beam and regulating a driving state of the work or the electron beam to restart the machining. CONSTITUTION:Based on the instructions from an arcing detector 17, in a state that the arcing is generated and a dull machining condition is unstable, the electron beam 5 is projected on a collector 20 other than a roll 10 which is the work by a blanking electrode 18. Then, with the stabilization of the machining condition, the electron beam 5 is deflected and projected on the next projecting position of the roll 10 to restart the dull machining. Accordingly, even if the arcing is generated, the stable and regular dull machining is performed on the work 10. Moreover, when the electron beam 5 is deflected and the machining is restarted, pulse frequency of the electron beam 5 is increased than that at the time of machining in a stationary state and it is regulated so that the deflection of the electron beam is not required gradually by accelerating, etc., the driving speed of the roll. Accordingly, accumulation of polarizing angle of the beam and gradual enlarging. is prevented.
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