Method of preparing a machining fluid for electroerosion
AssigneeInoue-Japax Research Incorporated
InventorKiyoshi Inoue
Life of this patent
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Abstract
A new method is disclosed for the electroerosion machining of a workpiece by employing as a machining fluid, raw water which has been deionized until its resistivity increases to at least 10.sup.5 ohm-cm and then decreasing the resistivity of the raw water deionized previously by adding thereto a conductivity modifier substantially free from chloride ions, said conductivity modifier being added to said deionized water in an amount sufficient to impart to the resulting machining fluid a predetermined conductivity.
Claims12
A method of carrying out electrical discharge machining (EDM) on a conductive workpiece, comprising the steps of:
- (a) spacedly juxtaposing an EDM tool electrode with the workpiece to define between them an EDM gap flushed with an EDM medium;
- (b) drawing from a supply thereof a raw water containing chlorine;
- (c) deionizing said raw water containing chlorine until its resistivity increases to at least 10.sup.5 ohm-cm and its chlorine content is reduced to at most 1 ppm and thereafter decreasing the resistivity of the deionized raw water by adding thereto a conductivity modifier substantially free from chlorine ions in an amount sufficient to impart to the resulting fluid a predetermined conductivity which in terms of resistivity ranges between 10.sup.3 and 10.sup.4 ohm-cm;
- (d) passing said fluid in a dynamic flow as said EDM medium into and through said EDM gap while effecting a succession of machining electrical discharges between the electrode and the workpiece across the gap to remove stock from the workpiece;
- and
- (e) relatively displacing the EDM electrode and the workpiece so that the electrode effectively moves in the workpiece to advance stock removal therein.
A method of carrying out electrical discharge machining (EDM) on a conductive workpiece, comprising the steps of:
- (a) spacedly juxtaposing an EDM tool electrode with the workpiece to define between them an EDM gap flushed with an EDM medium;
- (b) drawing from a supply thereof a water containing an element which deteriorates an EDM result on the workpiece;
- (c) deionizing said water containing said element in an ionized form until its resistivity increase to at least 10.sup.5 ohm-cm and the content of said element therein is reduced to at most 1 ppm and thereafter decreasing the resistivity of the deionized water by adding thereto a conductivity modifer substantially free from ions of said element in an amount sufficient to impart to the resulting fluid a predetermined conductivity which in terms of resistivity ranges between 10.sup.3 and 10.sup.4 ohm-cm;
- (d) passing said fluid in a dynamic flow as said EDM medium into and through said EDM gap while effecting a succession of machining electrical discharges between the electrode and the workpiece across the gap to remove stock from the workpiece;
- and
- (e) relatively displacing the EDM electrode and the workpiece so that the electrode effectively moves in the workpiece to advance the stock removal therein.
Dependencies are inferred from the claim text.