| 摘要 |
<p>This invention relates to a working liquid feeding apparatus for a wire cut electric discharge machine capable of easily adjusting a working liquid feed quantity of each of upper and lower nozzles to an optimum value suitable for a machining mode. The working liquid feeding apparatus, in which pump (11) is connected to inlet ports of first and second three-way change-over valves (61, 62) through a main conduit (12) and first and second sub-conduits (71, 72) and third and fourth sub-conduits (73, 74) are respectively connected to the two outlet ports of each change-over valve, is operated under the state where valve opening of flow regulation valves (81 SIMILAR 83) of the sub-conduits is adjusted so that the feed quantity of the working liquid through the first and third sub-conduits and the feed quantity of the working liquid through the second sub-conduit are suitable for punching and for end surface machining, respectively, and state where the flow regulation valve (84) of the second sub-conduit is adjusted so that the feed quantity of the working liquid through the fourth sub-conduit is about 10 to 15 % of the feed quantity through the second sub-conduit. Then, the same and suitable amount of the working liquid which is suitable for punching is jetted from the upper and lower nozzles (40, 50) at the time of punching and at the time of end surface machining, on the other hand, the suitable amount of the working liquid for the end surface machining is jetted from the upper nozzle along the end surface of a work and along a wire electrode while a small amount of the working liquid is jetted from the lower nozzle.</p> |
