Electric heating – Metal heating – Cutting or disintegrating
Patent
1997-04-24
1999-02-23
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
B23H 710
Patent
active
058747028
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a wire cut electrical discharge machining device which, using a traveling wire electrode, machines a workpiece by generating electrical discharges in a gap formed between the wire electrode and the workpiece to be machined. In particular, the present invention relates to a wire cut electrical discharge machine equipped with a recovery device to recover the wire electrode used to generate the electrical discharges.
BACKGROUND OF THE INVENTION
Wire cut electrical discharge machining devices are known in which a continuous wire-shaped electrode, unwound from a wire supply source such as a bobbin or reel, is fed into a work tank or pan in which the workpiece is held and, after being used to generate electrical discharges in the space formed between the wire electrode and the workpiece -- the machining "gap" -- is taken up by a recovery roller. In devices of this type, the winding of the wire electrode on the recovery roller side can have undesirable effects on the wire electrode which is traveling through the gap side.
Wire cut electrical discharge machining devices having a container provided outside of the work tank with sufficient capacity to recover the spent wire electrode, and a mechanism for conveying the wire electrode from the gap to the container are known. Generally, such wire conveying mechanisms include a device mounted in proximity to the wire recovery container to pull the wire electrode, and a part for feeding the wire electrode from the gap to the wire pulling device, for example multiple feed rollers and pulleys, conveyor belts, or guide tubes into which a fluid is introduced, have been used for this purpose. In addition, a device which imparts curl to the wire may be provided between the wire pulling device and the container, so that the wire can be stored in an orderly manner in the container. Alternatively, a device for cutting the wire into small pieces may be provided. Such additional devices improve the storage capacity of the container.
Normally, the tension imparted to the wire electrode as it travels through the gap side is controlled by the joint action of a brake device, which is provided between the wire supply device and the gap, and which imparts an adjustable damping on the wire, and the wire pulling device. The wire pulling device performs a portion of the tension control function, so that failures along the travel path between the gap and the wire pulling device, such as wire straying from the travel path or wire jamming, may be transmitted to the wire electrode passing through the gap and cause poor machining accuracy. In particular, such failures can easily occur when automatically threading the leading end of a wire having a diameter less than, for example, about 0.1 mm, to pass through the initial hole in the workpiece and on to the pulling device.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a wire cut electrical discharge machining device in which failures along the travel path of the wire electrode used to generate electrical discharge do not cause undesirable effects on the wire electrode traveling through the gap.
Another object of the present invention is to provide an electrical discharge machining device equipped with a simply constituted device for the processing of used wire electrode.
Other objects of the present invention are discussed in the explanation which follows, and will be apparent to practitioners of the art through implementation of the invention.
A wire cut electrical discharge machining device according to the present invention causes electrical discharges to occur in the gap formed between a wire electrode and a workpiece using a continuous traveling wire electrode, which machines the workpiece, and comprises a work tank which holds the workpiece, a wire cutting device which cuts the wire electrode used to generate an electrical discharge into small pieces, a container to recover the small wire pieces, and, mounted outside the work tank, a device for convey
REFERENCES:
patent: 4242558 (1980-12-01), Kunze
patent: 4698478 (1987-10-01), Girardin
patent: 4751364 (1988-06-01), Tobler et al.
patent: 5047607 (1991-09-01), Briffod
patent: 5288965 (1994-02-01), Gambin et al.
patent: 5357072 (1994-10-01), Garwick
patent: 5523538 (1996-06-01), Matsuda
Supplementary European Search Report, No Publication Date.
Evans Geoffrey S.
Sodick Co. Ltd.
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