| 摘要 |
An improved method and apparatus for automatically resetting a wire electrode (E) in an operating setup on a traveling-wire electroerosion machine (e.g. a TW-EDM machine) is disclosed. Upon termination of a given machining operation with the machine commenced with a starting hole (h1) in the workpiece (W), the wire electrode spanning in a continuous stretch between a supply side (5) and a collection side (27) is broken in a region adjacent to the workpiece and at one of the opposite sides thereof by forming in the wire electrode in the said region at least two coplanar grooves disposed substantially symmetrically about the longitudinal axis thereof, and then applying a tension to the wire electrode to break the latter at a neck formed by the said grooves. One broken end portion of the broken wire electrode is threaded into and through a new starting hole (h2) in a workpiece for machining a contour therein in the subsequent machining operation to reestablish the said continuous stretch of the wire electrode between the supply and collection sides. An air jet may be applied through a nozzle (70) at least in the region of the wire electrode to be heated, grooved and broken so as to blow off any residue of the machining liquid which remains adherent to the wire electrode whereby to allow the latter to be uniformly heated without any localized thermal stress. This enables the wire electrode to be broken with straight broken end portions. |
