| 摘要 |
<p>This invention provides an initial hole machining unit for wire cut electric discharge machines, which is capable of efficiently carrying out an initial hole machining over the whole electric discharge machinable region determined in accordance with the mechanical construction of a wire cut electric discharge machine, without changing a mechanical coordinate system or correcting the positional command data, and which does not require any processing liquid supply means. An initial hole machining unit (100) is provided with a unit body movable between an initial hole machining position and a standby position which is away from an upper wire guide, and an initial hole machining pipe electrode (101) provided on the unit body is in alignment with a wire electrode (201). The pipe electrode (101) connected to an electric discharge machining power source (206) is positioned on an arbitrary portion of the electric discharge machinable region and then moved toward a work (300). An electric discharge is then generated between the pipe electrode and the work while a working liquid is supplied through a working liquid passage (103d) in the unit body to form an initial hole.</p> |
