Electric heating – Metal heating – Cutting or disintegrating
Patent
1991-05-09
1992-05-12
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
36447404, 36447414, 36447434, B23H 706, B23H 720
Patent
active
051130505
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of creating coreless-machining NC data for wire cut electric discharge machining.
BACKGROUND ART
When a piercing operation is performed by means of wire cut electric discharge machining, a core to be cut off from a workpiece body is held by the use of a jig such as a magnet or suction device, so that the core will not be dropped out from the workpiece body. However, if the core is small in size, the core may be dropped out from the workpiece body and may damage a wire (tool electrode) or parts of an electric discharge machine. Therefore, in the prior art, so-called coreless-machining is carried out, in which electric discharge machining is effected over the whole of a core area while moving the wire in the core area, so as to cause the entire core to be melted and thus prevented from being dropped out.
In the case of using a programming unit for electric discharge machining to create coreless-machining data (program), a pocket machining data creating function of a programming device for milling is conventionally utilized since the prior art device has no function used exclusively for the coreless-machining data creation. In this case, however, a definition inputting operation for defining the procedure of the coreless-machining is complicated, and the created NC data may conflict with inhibited matters inherent to the wire cut electric discharge machining. For example, unlike the milling, in the wire cut electric discharge machining for machining a workpiece by the use of a wire which extends through the workpiece, it is inhibited to cause a wire to be retarded from the workpiece, and then rapidly moved to and positioned at the machining starting position on the workpiece. When an inhibited operation of this kind is erroneously defined in the programming operation, wire disconnection may occur.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a method of creating coreless-machining NC data for wire cut electric discharge machining.
In order to achieve the above-mentioned object, a method of creating NC data for coreless-machining according to the present invention comprises the steps of: (a) defining a coreless-machining area beforehand; (b) automatically determining a central position of the coreless-machining area as a machining starting position; (c) automatically determining a spiral wire locus starting from the machining starting position and reaching a contour of the coreless-machining area; and (d) automatically creating an NC data part used for moving a wire along the wire locus while performing electric discharge machining. Preferably, the method of the present invention further comprises a step of automatically creating an NC data part for moving the wire from a wire extension position to the machining starting position while performing electric discharge machining.
As described above, according to the present invention, since the central position of the previously defined coreless-machining area is automatically determined as the machining starting position, and the NC data part used for moving, where required, the wire from the wire extension position to the machining starting position while performing the discharge machining process is automatically created, a manual operation for inputting the machining starting position can be omitted, and the NC data conflicting with such inhibition matters, inherent to the wire cut discharge machining, as causing the wire to rapidly move from the wire extension position to the machining starting position can be prevented from being erroneously programmed, thus preventing the wire disconnection caused by this kind of erroneous programming operation. Further, since the NC data part used for moving the wire along the spiral wire locus from the center of the coreless-machining area to the contour of the coreless-machining area while effecting the discharge machining is automatically created, desired coreless NC data can be created without the need of performing a compl
REFERENCES:
patent: 5038011 (1991-08-01), Nakayama
Matsunaka Toru
Seki Masaki
Takegahara Takashi
Evans Geoffrey S.
Fanuc Ltd.
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