EDM using hydrocarbon and water liquids.

摘要

An improved EDM system includes a partition member which separates a space surrounding a workpiece (6) in a worktank (3) into a first chamber which directly surrounds a machining area of the workpiece and a second chamber outside of the first chamber and surrounding a portion of the workpiece. The machining area and the first chamber are contiguous with each other and flooded with a machining medium (Lh) constituted by a liquid hydrocarbon to allow successive electrical discharges to be effected therethrough to electroerosively remove material from the workpiece in the first chamber. The second chamber is flooded with a coolant (Lw) constituted by a water liquid, preferably containing a non-ionic surface active agent dissolved in deionized water, in contact with the said portion of the workpiece to coolthe latter against heating thereof along the machining area by the erosive discharges in the first chamber.