Electric heating – Metal heating – Cutting or disintegrating
Patent
1986-09-17
1989-01-10
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
B23H 702, B23H 710
Patent
active
047975261
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a wire-cut electric discharge machine and, more particularly, to a wire-cut electric discharge machine of the type in which: a wire electrode is pulled out from a supply reel, passes through a predetermined path, is used for machining a work piece, and is collected by a collecting apparatus; this wire electrode passes through a working portion of the work piece and thereafter, it is turned back, is returned along the path it had come through, passes again through the working portion of the work piece, and is collected and scrapped; and the single work piece is simultaneously worked by these doubled and reciprocating segments of the wire electrode.
BACKGROUND ART
In conventional well-known wire-cut electric discharge machines, the wire electrode which has been used once for machining is scrapped without being used again.
The wire electrode is pulled out of the supply drum, passes through various kinds of guide rollers and the like, is led to the machining portion of the work piece, passes through the working zone, and is collected by the electrode collecting apparatus.
To determine the working zone, a pair of dies adapted to position the electrode and other guide members are ordinarily respectively attached to the tip portions of a pair of arms which extend from the column so as to locate the working zone therebetween.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a cross sectional view showing operative states of the main parts of an embodiment of the present invention;
In this working portion, the wire electrode is rectilinearly suspended between the guide members by the action of a predetermined tension, is allowed to face the working portion of the work piece with a predetermined working gap held, and is fed in the direction of the central axis of the wire electrode itself. The electrode which has passed through the working place and has been used is wound around the electrode collecting drum, or cut and collected and scrapped.
Therefore, there is a problem such that the wire electrode is scrapped in spite of the fact that it may be still used again.
On the other hand, in conventional well-known wire-cut electric discharge machines, only one wire electrode exists in the working portion to be allowed to face the work piece, and the half peripheral surface on the side of the work advancing direction of this single wire electrode faces the working surface of the work piece and the machining is performed.
Since those opposite surfaces are the cylindrical surfaces, the gap therebetween is narrow and it is very difficult to supply enough working fluid into the gap. A sufficient cooling effect is not obtained, therefore, high-speed machining using the current pulse of a high energy cannot be performed. There is the problem such that the working efficiency is insufficient.
In addition, since the working gap is narrow, it takes a certain time for dropping the pressure which is caused by the discharge which is generated in this gap. Thus, the wire electrode is bent like an arch on the side opposite to the machining direction due to the influence of the residual pressure, so that there is the problem that the machining accuracy deteriorates in an acute-angle portion, arc portion of small radii, and the like of the machining line.
Further, a number of discharge craters are produced in the outer peripheral surface of the wire electrode by the electric discharge and the outer peripheral surface becomes rough. Therefore, in the case of a thick work piece, in particular, there is also the problem that a smooth worked surface cannot be obtained.
Moreover, at the start of the machining, the wire electrode needs to be suspended among various kinds of guide rollers and to be inserted into the holes in the electrode positioning dies and the through holes which have previously been formed in the work piece, and the like.
These operations are very troublesome, since these operations need to be repeated whenever the wire electrode is cut during the machining or a plurality of p
REFERENCES:
patent: 4333000 (1982-06-01), Shimizu
patent: 4475996 (1984-10-01), Inoue
patent: 4485288 (1984-11-01), Schneider
patent: 4598190 (1986-07-01), Balleys
patent: 4649252 (1987-03-01), Obara
patent: 4739143 (1988-04-01), Sakai et al.
Evans Geoffrey S.
Inoue Japax Research Incorporated
Pellinen A. D.
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