Abstract
Maximum cutting speeds of Wire EDM are limited by the break down of wire. During machining of the Wire EDM, the wire is heated by discharges but cooled by the flow of machining fluid, normally water. Abnormal overheating of the wire causes low tensile strength of the wire, and wire break down. So that wire cooling by the water flow has great effects on maximum cutting speed of wire EDM.In this 1st report, the water flow in cut grooves by wire EDM are analysed using comformal mapping. Results shows that the flow rates of water at the nozzle are proportional to a aquare root of pump outlet pressure and the flow rate in the cut groove decreases so quickly if workpiece thickness increases. Larger inner nozzle size or larger outer nozzle size causes higher flow rate in the cut groove.
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