Electric heating – Metal heating – Cutting or disintegrating
Patent
1982-07-22
1985-01-01
Albritton, C. L.
Electric heating
Metal heating
Cutting or disintegrating
204129, 219 69M, B23P 108
Patent
active
044917147
ABSTRACT:
A novel EDM method is disclosed in which a gas such as compressed air is dissolved in a water liquid to form a solution which is pumped into the machining gap formed between a tool electrode and a workpiece. An EDM power supply provides a succession of electrical discharges across the gap through the supplied solution to electroerosively remove stock from the workpiece with the decomposition of oxygen and hydrogen gases from the water liquid. The dissolved gas in the solution is liberated in the machining gap upon exposure to the electrical discharges to add to these gases, thereby increasing the electroerosive stock removal. The gas is dissolved into the water in an amount of at least 20% by volume of the oxygen and hydrogen gases normally decomposed from the water liquid by the electrical discharges. An apparatus for executing the method includes a pressure chamber traversed by the pumped flow of the water liquid and having a gas supply inlet through which the compressed gas is introduced for solubilization in the water liquid. The region of the machining gap is preferably enclosed in a second pressure chamber maintained under a superatmospheric pressure to limit the spontaneous liberation of the dissolved gas from the water liquid.
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Albritton C. L.
Evans Geoffrey S.
Inoue-Japax Research Incorporated
Ross Karl F.
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