Charmilles Technologies S.a.

Remi Gambin

Joseph Josserand

Bernard Babel

An EDM machine with a travelling wire electrode having a device for straightening and rethreading the wire electrode. The device has a pivotally rotating arm that has a clamp to grasp the free end of the wire after accidental breakage. The clamp applies a tightening stress (optionally the wire is being heated), the wire portion to be discarded is wound on a capstan (configured with circumferential grooves) associated with the clamp on the arm, a wire cutter severs the wire above the capstan, and finally the wire is rethreaded.

Prehesive device for the electrode wire of an EDM cutting machine

The device has a case (1) which has a wire guide (2) and a chamber (4) filled with machining liquid which is brought there under pressure by a pipe (7). A nozzle (5) in the shape of a truncated cone fits in the case and closes the chamber (4) in its normal working position by supporting its periphery on the flange (6) provided around the case (1), under the action of the pressure exerted by the dielectric liquid and if necessary by a return spring (8). The thrust exerted on the nozzle by an obstacle (10) during a lateral collision tilts the nozzle without damaging it and it causes at L an escape of liquid which causes the pressure to drop in the chamber (4). A transducer (13) signals the drop in pressure following the collision to the operator and/or to a control system of the erosion machine.

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Les Collines, France

Remi Gambin