Fluid handling – Systems – Dividing into parallel flow paths with recombining
Patent
1990-07-10
1992-02-04
Hepperle, Stephen M.
Fluid handling
Systems
Dividing into parallel flow paths with recombining
219 6912, B23H 736
Patent
active
050852477
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a machining fluid supply device for a wire cut electric discharge machine, capable of easily controlling the amount of machining fluid supplied from upper and lower nozzles, respectively, to values suited to different machining modes.
BACKGROUND ART
Wire cut electric discharge machines are generally provided with a machining fluid supply device which has a machining fluid supply source including a pressure pump, etc., so as to supply machining fluids from upper and lower nozzles, respectively connected to the supply device and arranged above and below a workpiece, to a gap between the workpiece and a wire electrode, to thereby cool the workpiece and the wire electrode and remove sludge from the gap, and further to maintain the workpiece and the wire electrode in a suitably insulated state. The amount of the machining fluid discharged from the pressure pump is controlled in a multi-stage fashion in accordance with the values of various machining parameters such as wire feed speed, thickness of the workpiece, diameter of the wire, etc. The amount of machining fluid supplied varies in accordance with the parameter values.
In wire cut electric discharge machines, electric discharge machining is performed in either of two machining modes, i.e., a cut-out operation mode for cutting a semi-finished product of a desired shape out of a workpiece or cutting a portion of a desired shape out of a workpiece or semi-finished product, and a face machining mode for, e.g., finishing the cut surfaces of a workpiece or semi-finished product after a cut-out operation. To control the amount of the machining fluid supplied from the upper and lower nozzles to values suited to the different machining modes, a conventional machining fluid supply device comprises first and second flow regulating valves which are disposed in first and second pipes respectively connecting the upper and lower nozzles to the pressure pump, and the openings of these two flow regulating valves are manually adjusted to different values, depending on whether the cut-out operation or face machining is to be carried out. It is, however, very troublesome to carry out a manual adjustment every time the machining mode is switched from cut-out operation to face machining or vice versa. Further, where both a cut-out operation and face machining are involved, unmanned operation of the electric discharge machine is not available because the flow rates of the machining fluids must be manually adjusted.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a machining fluid supply device for a wire cut electric discharge machine, which is capable of easily controlling the amount of machining fluid supplied from upper and lower nozzles, to values suited to different machining modes.
To achieve the above-mentioned object, there is provided a machining fluid supply device for use with a wire cut electric discharge machine having upper and lower nozzles and adapted to carry out an electric discharge machining in a desired one of a plurality of machining modes which include first and second machining modes. The machining fluid supply device comprises a machining fluid supply source, first and second supply lines respectively interposed between the machining fluid supply source and the upper nozzle, third and fourth supply lines respectively interposed between the machining fluid supply source and the lower nozzle, and selector means for selectively permitting supply of machining fluids through the first to fourth supply lines. In the first machining mode, the machining fluids are supplied from the upper and lower nozzles through the first and third supply lines at flow rates suited to the first machining mode, and in the second machining mode, the machining fluids are supplied through the second and fourth supply lines at flow rates suited to the second machining mode.
Preferably, the machining fluid supply device comprises control means for controlling the selector means.
As described above, a
REFERENCES:
patent: 3454737 (1969-07-01), Pfau et al.
patent: 4191215 (1980-03-01), Gonner
patent: 4740667 (1988-04-01), Obara
patent: 4868363 (1989-09-01), Aso et al.
Fanuc Ltd.
Hepperle Stephen M.
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