Electric heating – Metal heating – Cutting or disintegrating
Patent
1985-10-11
1987-11-10
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
219 69D, B23H 100, B23H 110, B23H 730
Patent
active
047059320
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to an electrical discharge boring machine employing a hollow bar electrode and, more specifically, to an electrical discharge boring machine effectively applicable to boring an initial hole in a workpiece for receiving a wire electrode therethrough for wire electrode type electrical discharge machining by a wire electrode type electrical discharge machine employing a wire electrode.
2. Background Art
When subjecting a workpiece to wire electrode type electrical discharge machining, it is necessary to bore a hole for receiving a wire electrode, namely, an initial hole, in the workpiece at a predetermined position.
A conventional method of forming an initial hole is by drilling a workpiece before hardening or boring a workpiece by an electrical discharge machine employing a well-known solid electrode. The latter method is capable of boring an initial hole in a workpiece even after hardening the workpiece. However, when an initial hole is formed in a workpiece by such a conventional method, the workpiece is removed from the boring machine, and is then mounted on the X-Y table of a wire electrode type electrical discharge machine at a predetermined position, and the initial hole is then aligned with the control unit, and the wire electrode type electrical discharge machining is started. This wire electrode type electrical discharge machining requires complicated preparatory work. Accordingly, it has been desired to develop a simple apparatus capable of achieving both the boring of an initial hole and the wire electrode type electrical discharge machining. Nevertheless, a boring machine meeting such a desire has not yet been proposed.
DISCLOSURE OF THE INVENTION
Accordingly, it is an object of the present invention to provide an electrical discharge boring machine capable of meeting such a desire and applicable to general electrical discharge boring.
The present invention provides an electrical discharge boring machine employing a hollow bar electrode for boring a workpiece through electrical discharge machining, comprising: a main unit capable of being joined to a vertical feed mechanism which moves a unit joined thereto vertically relative to an electrically conductive workpiece, and provided at the lower part thereof with a rotary chuck for holding the hollow bar electrode; a guide holder holding a guide for slidably guiding the hollow bar electrode held by the rotary chuck near the workpiece, a nozzle provided on the lower part of the guide to supply a machining liquid to an electrical discharge machining zone and the lower end of a guide rail for guiding the main unit for vertical feed; detecting means for detecting the limit of vertical feed of the main unit, provided on the main unit so as to engage dog means provided on the guide rail; conductive means provided on the main unit to supply electric power for electrical discharge machining to the hollow bar electrode held by the rotary chuck; and a rotary joint provided within the main unit to introduce the machining liquid into the hollow bar electrode held by the rotary chuck. When this electrical discharge boring machine is joined to the vertical feed mechanism of a wire electrode type electrical discharge machine, the same is able to carry out boring an initial hole effectively.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal sectional view of an electrical discharge boring machine, in a preferred embodiment, according to the present invention, adapted to be joined to a vertical feed mechanism; and
FIG. 2 is a sectional view taken along line II--II of FIG. 1, showing the fit between a guide rail and a groove.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIG. 1, an electrical discharge boring machine, in a preferred embodiment, according to the present invention has a main unit 12 which is mounted through an arm or a bracket 10 on a vertical feed mechanism, such as the upper head of a wire electrode type electrical discharge machine 11. A chuck 14 is provided on t
REFERENCES:
patent: 2490302 (1949-12-01), Holfelder
patent: 2650979 (1953-09-01), Teubner
patent: 2807706 (1957-09-01), Oezer
patent: 3469056 (1969-09-01), O'Connor
patent: 3472993 (1969-10-01), Gromov et al.
patent: 3609279 (1971-09-01), Giesbrecht
patent: 3688074 (1972-08-01), Stirner et al.
patent: 3851135 (1974-11-01), Moracz
patent: 4259562 (1981-03-01), Cammann et al.
patent: 4387284 (1983-06-01), Nicholas et al.
patent: 4423302 (1983-12-01), Shimiza
patent: 4476368 (1984-10-01), Cammann et al.
patent: 4518842 (1985-05-01), Obara
Aso Toshiyuki
Tshibashi Tamotu
Evans Geoffrey S.
Fanuc Ltd.
Pellinen A. D.
LandOfFree
Electrical discharge boring machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrical discharge boring machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrical discharge boring machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1069412