Electric heating – Metal heating – Cutting or disintegrating
Patent
1997-01-10
1998-05-19
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
B23H 710
Patent
active
057538808
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of automatically recovering a wire breakage in a wire electric discharge machine having an automatic wire connecting function.
BACKGROUND ART
When a wire breaks in a machining area during a wire electric discharge machining, it is necessary to reconnect the wire. For this purpose, a portion of an upstream side of the wire is cut off and a workpiece is moved to a position where a machining start hole of the workpiece is in confronting relation to upper and lower guides and then the automatically wire connection is performed by inserting the wire into the machining start hole again. After the wire is reconnected, the wire is moved to retrace a machining path to the position at which the wire broke based on the machining program, whereupon the electric discharge machining is restarted.
In this conventional method, it is inevitable to take a considerable time to restart the electric discharge machining after the wire breakage.
DISCLOSURE OF INVENTION
It is an object of the present invention to provide a wire breakage recovering method capable of reducing a time from the wire breakage to the restarting of the electric discharge machining by performing the automatic wire connection near a position at which the wire broke.
According to a first aspect of the present invention, a method of recovering a wire breakage comprises the steps of: annealing a portion of the wire, upstream of a position of the wire breakage and fusing an end of the annealed wire portion by an annealing/fusing device, and removing the portion of the wire exhausted by an electric discharge machining and separated by the fusing, when the wire is broken in the electric discharging machining; discriminating whether a machining block in which the wire breakage occurred is of a straight-line command or of a circular-arc command; discriminating whether or not the machining block is of a circular-arc command having a radius equal to or larger than a set radius, if it is discriminated that the machining block is of a circular-arc command; discriminating whether or not a length of movement of the wire on a machining path between a start point of the machining block and the wire breakage position is equal or larger than a set value, if it is discriminated that the machining block is of a straight-line command or of a circular-arc command having a radius equal or larger than the set radius; automatically connecting the wire at an intermediate position on the machining path between the start point of the machining block and the wire breakage position while spouting the machining fluid from the nozzle to restrict the wire, if it is discriminated that the length of movement of the wire on the machining path between the start point of the machining,block and the wire breakage position is equal to or larger than the set value; discriminating whether a machining block immediately preceding the machining block is of a straight-line command or of a circular-arc command, if it is discriminated that the machining block in which the wire breakage-occurred is of a circular-arc command having a radius smaller than the set value or if it is discriminated that the length of movement of the wire on the machining path between the start point of the machining block and the wire breakage position is smaller than the set value; discriminating whether or not the immediately preceding machining block is of a circular-arc command having a radius larger than the set radius, if it is discriminated that the immediately preceding machining block is of a circular-arc command; discriminating whether or not a length of movement of the wire on a machining path between start and end points of the immediately preceding machining block is equal to or larger than the set value, if it is discriminated that the immediately preceding machining block is of a straight-line command or if it is discriminated that the immediately preceding machining block is of a circular-arc command having a radius larger than the set radius; auto
REFERENCES:
patent: 4350864 (1982-09-01), Janicke et al.
patent: 4367392 (1983-01-01), Girardin
patent: 5077457 (1991-12-01), Onaka et al.
patent: 5113051 (1992-05-01), Sakaue
patent: 5603851 (1997-02-01), Noda et al.
Kajitori Toyotada
Yoda Shinji
Evans Geoffrey S.
Fanuc Ltd.
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