Electric heating – Metal heating – Cutting or disintegrating
Patent
1997-04-23
1999-01-12
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
B23H 702
Patent
active
058594019
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a wire electric discharge machining method, and more particularly to a wire electric discharge machining method for cutting male forms off a workpiece.
BACKGROUND ART
In a wire electric discharge machining, if the machining is completed on all the commanded machining path, a male form drops to possibly collide with a lower wire guide and damage it. Especially in machining a plurality of forms from a single workpiece, when the machining of one form is completed, it is necessary to cut a wire electrode and move the workpiece to be positioned at a machining start hole for the next machining form, and to automatically connect the wire electrode through the next machining start hole. The dropped male form might slide on the lower wire guide in moving the workpiece to cause damage to the lower wire guide. Therefore, a first machining is performed on a great part of the machining form and is stopped immediately before the male form drops, to proceed to the next machining form with the male form remaining on it. Then, the electric discharge machining is performed on the next machining path to a position immediately before the male from drops. In a second machining, each male form is cut off the workpiece in the presence of an operator.
The following two methods are known for performing the second machining.
(1) The wire electrode is inserted through the machining start hole and is moved along the already machined groove with the electric discharge off (or with the electric discharge on), thereby cutting off the reserved section by the electric discharge machining. This method is adopted for a male form of relatively light weight. (2) After clamping the male and female forms so as to be bridged therebetween on the first machining path to hold the male form, the wire electrode is inserted through the machining start hole and then the workpiece is moved reversely in the second machining path to perform the electric discharge machining, thereby cutting off the reserved section.
In the method (1) of the above two methods, when the wire electrode is moved along the machined groove with the electric discharge off, the wire electrode might be stuck as it is caught by the workpiece. When the wire electrode is moved along the machined groove with the electric discharge on, the male form might be deformed as the electric discharge machining is performed twice. In the method (2), it is necessary to create a machining program to move the workpiece reversely. In either of the two methods (1) and (2), it is required to prepare two machining programs for the first machining and the second cutting-off machining.
Thus, in the foregoing conventional wire electric discharge machining methods, two programs are necessary for the first machining to leave a reserve section and the second machining to cut off a male form by machining the reserve section.
DISCLOSURE OF INVENTION
It is an object of the present invention to provide a discharge machining method capable of performing both first machining and second (cutting-off) machining based only on a single machining program.
A wire electric discharge machining method of the present invention is performed using a wire electric discharge machine having an annealing/fusing device for annealing a wire into a straight shape upstream of an upper wire guide in a wire path and fusing the wire near the upper wire guide, and an automatic wire connecting device for automatically connecting the wire by restricting the wire by a machining fluid flow from a nozzle of the upper guide.
A machining program defining a plurality of machining paths each corresponding to each male form is inputted, and a cutting reserve amount and a backward amount for a second discharge machining is set. In a first discharge machining, the wire is automatically connected through a machining-start hole in the first machining path by the automatic wire connecting device, to perform an electric discharge machining for shaping along the first machining path based on said ma
REFERENCES:
patent: 4544819 (1985-10-01), Nomura et al.
patent: 4940871 (1990-07-01), Watanabe
patent: 5043550 (1991-08-01), Sakaue
patent: 5386093 (1995-01-01), Borsari
Kajitori Toyotada
Kita Yuki
Evans Geoffrey S.
Fanuc Ltd.
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