Electric heating – Metal heating – Cutting or disintegrating
Patent
1985-01-28
1987-01-20
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
204206, 219 69D, B23H 100, B23H 710
Patent
active
046381406
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an improvement applicable to an apparatus for guiding a wire electrode of a wire electrode discharge machine (hereinafter referred to as a wire EDM). More specifically, this invention relates to an improved apparatus for guiding a wire electrode of a wire EDM, which is suitable for employment in the ordinary machining mode (non-taper machining mode) and which is suitable for employment in the taper machining mode while allowing a wire EDM to realize improved quality of machining accuracy.
BACKGROUND OF THE INVENTION
A wire EDM is defined as equipment for machining a work made of a conductive material, particularly of metal, based on the machining process, wherein: (a) an intermittent electric spark discharge is generated in a machining liquid ejected into a gap between a workpiece of a conductive material, e.g., a metal and a wire electrode of a conductive material, e.g., brass, the wire electrode being extended under tension to penetrate the work; (b) the intermittent electric spark discharge causes an extremely small region of the workpiece adjacent to the aforementioned gap (hereinafter referred to as a machining region), to be softened and/or melted; (c) the intermittent electric spark discharge incidentally causes the internal pressure of the machining region to fluctuate; and (d) the fluctuated internal pressure causes the softened and/or melted region of the conductive material, e.g., a metal, to be disintegrated into a number of small particles and removed from the workpiece.
The aforementioned wire EDM is provided with a numerical control (NC) system, or the like, to accurately regulate, with an accuracy level of 0.001 mm, the geometrical position of the workpiece relative to the supporting point of the wire electrode which has an approximate diameter of 0.03-0.4 mm, thereby accurately regulating the geometrical position of the intermittent electric spark discharge (which is identical to the location of the wire electrode in the vicinity of an electrical discharge machining plane which is defined as a plane along which electric discharge machining occurs along the wire electrode), and maintaining the gap between the wire electrode and the electrical discharge machining plane at approximately 0.03 mm. The wire EDM is further provided with a means for stabilizing the intermittent electric spark discharge. A combination of these means is effective to accurately regulate the geometrical position of the electrical discharge machining plane, resultantly realizing an excellent grade quality of machining accuracy.
Parameters allowed for regulating the wire EDM are limited to two items, including the geometrical position of the supporting point of a wire electrode with respect to a work and the aforementioned intermittent electric spark discharge. Therefore, it is essential for the wire EDM to extend the wire electrode without a sag and to maintain the gap between the wire electrode and the electrical discharge machining plane at a constant value, because it is otherwise impossible for the wire EDM to accurately regulate the geometrical position of the electrical discharge machining plane by regulating the aforementioned two parameters. Accordingly, the machining accuracy of a wire EDM greatly depends on the linearity of the wire electrode and the accuracy of the electrical discharge gap.
Thus, various efforts are being used to improve the linearity of the wire electrode and to stabilize the intermittent electric discharge to maintain the electric discharge gap at an accurately constant value.
Firstly, a V-groove-type wire guide is available in the prior art to improve the linearity of the wire electrode. As is illustrated in FIG. 1, a wire electrode 1 is extended under tension between a pair of V-groove type wire guides 2, 2', which are driven in a plane perpendicular to the wire electrode 1 by a servo mechanism. This V-groove type wire guide advantageously allows easy setting of the wire electrode and does not require any particular attention to be pai
REFERENCES:
patent: 3928163 (1975-12-01), Ullmann et al.
patent: 4123645 (1978-10-01), Shichida et al.
patent: 4250371 (1981-02-01), Haug et al.
patent: 4495393 (1985-01-01), Janicke
patent: 4539459 (1985-09-01), Yamagata
Aso Toshiyuki
Obara Haruki
Evans Geoffrey S.
Fanuc Ltd
Pellinen A. D.
LandOfFree
Apparatus for guiding a wire electrode of a wire electrode disch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for guiding a wire electrode of a wire electrode disch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for guiding a wire electrode of a wire electrode disch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2135885