Electric heating – Metal heating – Cutting or disintegrating
Patent
1988-06-30
1989-10-31
Paschall, M. H.
Electric heating
Metal heating
Cutting or disintegrating
219 6915, B23P 108
Patent
active
048779350
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a wire cut electrodischarge machine tool, more particularly to a wire cut electrodischarge machine tool which, when disconnection of an electrode wire occurs during the electrodischarge machining, repairs the disconnected end at a repair position apart from the electrodischarge machining region, then automatically lays the electrode wire between upper and lower heads having built-in wire guides to automatically prepare for the start of electrodischarge machining on the workpiece.
BACKGROUND ART
There has already been proposed a wire cut electro-discharge machine tool using an electrode wire of a wire shape or strip shape, which is provided with, for times when the electrode wire breaks during the machining, a clamp mechanism for clamping an electrode wire portion on a feeding side and an electrode wire feed mechanism for moving the electrode wire so that the end of electrode wire portion on the feed side coincides with a preset position and which thus enables automation of the insertion of the electrode wire portion of the feed side to the work (See Japanese Unexamined Patent Publication No. 56-3146). This known wire cut electrodischarge machine tool confirms the clamping of the disconnected end of the electrode wire by the above clamping mechanism, then refeeds the said wire disconnected end toward the electrode wire inserting hole of the work, then pulls back the electrode wire disconnected end projecting from the wire inserting hole of the work, holding it by a motor-driven electrode drawing mechanism, lays the electrode wire between upper and lower heads provided above and below the electrodischarge machining region, and thus prepares for restart of the wire cut electrodischarge machining. This known wire cut electrodischarge machine tool controls the wire cut electrodischarge machining process and the aforementioned machining restart preparation process at the time of electrode wire disconnection by means of a CNC device (computer numeral control device) using a microcomputer.
However, in a wire cut electrodischarge machine tool due to the electrodischarge action between the electrode wire and workpiece, or the tilted running of the electrode wire during taper hole machining, when the electrode wire breaks, the disconnected portion tends to be curved or rough surfaced. Therefore, often it is impossible to correctly refeed the disconnected electrode wire end through the wire inserting hole of the workpiece without some repair thereof.
Therefore, it has been considered necessary to use the afore-mentioned CNC device to automatically join the wire and prepare for restart of machining by eliminating curved portions of the electrode wire disconnected portion and roughed surface portions and further by preventing the removed portion from remaining on the work.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a wire cut electrodischarge machine tool which is provided with a means for automatically repairing disconnected electrode wires and which can satisfy this need.
The present invention provides, for example, as shown in FIG. 1, a wire cut electrodischarge machine tool which comprises a work table 24 for mounting a workpiece W fed automatically in an X-Y plane (horizontal plane orthogonal to the paper plane of FIG. 1), an electrode wire feeding device for feeding an electrode wire 14 through an electrodischarge machining region with respect to the workpiece W, upper and lower heads 22, 26 provided above and below the work table and having built-in wire guides, and an automatic electrode wire laying mechanism which used the jet flow of the machining fluid to automatically feed the wire between the upper and lower heads and automatically prepare for the start of machining, the wire cut electrodischarge machine tool being provided with, as shown in FIGS. 2A and 2B, an electrode wire feed mechanism 40 for pulling back the disconnected end of the electrode wire, which broke at the electrodischarge machining region during ele
REFERENCES:
patent: 4347423 (1982-08-01), Katsube et al.
patent: 4350864 (1982-09-01), Janicke et al.
patent: 4523074 (1985-06-01), Okuda
patent: 4608475 (1986-08-01), Inoue
patent: 4689462 (1987-08-01), Goto
Aso Toshiyuki
Ishibashi Tamotsu
Fanuc Ltd.
Paschall M. H.
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