Machining fluid supply controlling system for a wire cut electri

Details Machining fluid supply controlling system for a wire cut electri Machining fluid supply controlling system for a wire cut electri

1988-04-28

1989-08-15

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

137563, B23H 110

Patent

active

048576883

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. TECHNICAL FIELD
The present invention relates to a machining fluid supply controlling system for a wire cut electrical discharge machine and, more particularly, to a machining fluid supply controlling system for a wire cut electrical discharge machine, and capable of improving a finishing accuracy of the wire cut electrical discharge machining.
2. BACKGROUND ART
It is well known that the quality of water having a high purity used as a machining fluid is closely related to the machining accuracy of the wire cut electrical discharge machining. The quality of the machining fluid, i.e., water having a high purity, is adjusted according to the machining purpose. That is, the specific resistance of the machining fluid is maintained at a comparatively low value for rough machining, in which a high discharge current is supplied to the wire cut electrical discharge machine in order to avoid adhesion of powdery chips to the work, while the specific resistance of the machining fluid must be maintained at a high value for a finishing wire cut electrical discharge machining in which a low discharge current is supplied to the wire cut electrical discharge machine, because the electrical discharge machining action is reduced due to current leakage when the specific resistance of the machining fluid is small.
However, no single conventional wire cut electrical discharge machine has been able to integrally and efficiently carry out rough machining through finish machining by simply changing the quality, particularly, the specific resistance, of the machining fluid for rough machining and for finish machining. Therefore, it has been necessary to use separate wire cut electrical discharge machines for rough machining and for finish machining respectively.
Accordingly, it is an object of the present invention to provide a machining fluid supply controlling system for a wire cut electrical discharge machine, capable of readily changing the specific resistance of the machining fluid between a level appropriate for rough machining and a level appropriate for finish machining when controlling the quality of the machining fluid, to enable a single wire cut electrical discharge machine to integrally carry out the rough machining through finish machining.


DISCLOSURE OF THE INVENTION

The present invention provides a machining fluid supply controlling system for a wire cut electrical discharge machine having a rough-machining fluid supply system for rough machining and a finish-machining fluid supply system for finish machining, which are connected to the machining section of the wire cut electrical discharge machine, and capable of supplying machining fluids respectively having different qualities respectively for rough machining and for finish machining. The system comprises a first machining fluid tank having a filtering device and provided in the rough-machining fluid supply system. A second machining fluid tank has a filtering device and is provided in the finish-machining fluid supply system. A first machining fluid supply passage a pressurized machining fluid from the first machining fluid tank to the machining section. A second machining fluid supply passage supplies a pressurized machining fluid from the second machining fluid tank to the machining section. First and second return passages return the machining fluid from the machining section respectively to the first and second machining fluid tanks. A first machining fluid quality regulating circuit regulates the quality of the machining fluid to be supplied under pressure from the first machining fluid tank to the machining section. A second machining fluid quality regulating circuit regulates the quality of the machining fluid to be supplied under pressure from the second machining fluid tank to the machining section.
Preferably, the first machining fluid quality regulating circuit and the second machining fluid quality regulating circuit are provided respectively with specific resistance detectors, each for detecting the specific resistance of the asso

REFERENCES:
patent: 4367129 (1983-01-01), Inoue
patent: 4628170 (1986-12-01), Furukawa

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