Method of forming NC data for coreless machining in wire electri

Details Method of forming NC data for coreless machining in wire electri Method of forming NC data for coreless machining in wire electri

1998-10-07

2000-08-08

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

700162, B23H 702

Patent

active

061004936

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a method for creating NC data for the path of movement of a wire electrode, when performing cutting processing by means of wire cut discharge processing.
2. Description of the Related Art
When performing cutting processing by means of wire cut discharge processing, in particular, in cases where the core forming the cutting shape is relatively small, or the like, it is difficult to hold a core which has undergone cutting processing on the work by means of a jig comprising magnets or suction devices, and consequently the core sometimes becomes detached during processing, and parts of the wire or discharge processing device may be damaged by impact of the core when it falls.
Therefore, in order to prevent incidents of this kind in advance, so-called coreless processing, wherein wire discharge processing is conducted along the whole core and the core is completely melted, has been disclosed in Laid-Open Japanese Unexamined Patent Application No. 3-111124, and the like.
This commonly known coreless processing NC data creates a relative path of travel of a wire electrode with respect to a work, the path having a similar shape to the outline of the coreless processing region which expands successively from the centre of the coreless processing region, such that the whole of the cutting shape core region corresponding to cutout shape of the work is removed by wire cut discharge processing.
Conventionally, NC data for coreless processing as described above is created without regard to the size of the cutting start hole for wire cut discharge processing. Therefore, if the processing path moves inside this cutting start hole, the wire electrode will perform a purposeless movement relative to the work, without carrying out processing of any kind. Furthermore, processing time will also be lengthened.


SUMMARY OF THE INVENTION

The object of the present invention is to provide a method for creating NC data for coreless processing in wire cut discharge processing, wherein the size of the cutting start hole is taken into consideration and purposeless processing paths which do not contribute to processing are reduced.
In order to achieve the aforementioned object, in the method for creating NC data for coreless processing according to the present invention, wherein wire cut discharge processing is carried out by successively expanding the closed path of a wire starting from a cutting start point within a cutting shape, such that the whole of a specified cutting shape region can be processed by wire cut discharge, closed paths which pass only on the inner side of the cutting start hole are omitted, NC data is created for movement from the cutting start point and to a closed wire path, at least a portion of which passes through the processing region outside the cutting start hole, and subsequently NC data is created for closed wire paths which are successively expanded from the aforementioned closed wire path.
Since the present invention is devised such that NC data is only created for wire paths wherein a portion of the wire path passes through the region outside the cutting start hole, and no NC data is created for closed wire paths contained within the processing start region, then when processing by means of the aforementioned NC data, coreless processing can be carried out by implementing discharge processing starting from the region where discharge processing is required, without implementing purposeless movements of the wire cut discharge device, and therefore efficiency is good and processing time can be shortened.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of main components of an automatic programming device for implementing the method according to the present invention;
FIGS. 2-4 are flowcharts illustrating processing sequences according to one mode of the present invention as implemented by the processor in the automatic programming device in FIG. 1;
FIG. 5 is a diagram illustrating an outline of a coreles

REFERENCES:
patent: 5113050 (1992-05-01), Seki et al.

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