ELECTROCHEMICAL MACHINING METHOD, ELECTROCHEMICAL MACHINING APPARATUS AND ELECTROCHEMICAL MACHINING FLUID
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United States of America Patent
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Sep 8, 2016
app pub date -
Nov 5, 2013
filing date -
Nov 5, 2013
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Abstract
While switching polarity of an electrode, a voltage is applied between the electrode and a workpiece hard metal with the electrode used as a negative-electrode such that tungsten carbide (WC; component of the hard metal) is anodized to form a tungsten oxide (WO3), and a voltage is supplied therebetween with the electrode used as a positive-electrode such that cobalt (Co) that is a component of the workpiece is electrolytically-eluted and at the same time the WO3 generated by anodization is dissolved in the machining fluid, a saline solution (NaCl) or an aqueous solution of nitrate of soda (Na(No3)) is used as an machining fluid; a calcium salt is added beforehand to the machining fluid to react tungstate soda (Na2WO4) generated in the machining with the calcium salt whereby calcium tungstate (CaWO4) is produced; and a calcium compound is separated and recovered using a difference in specific gravity.
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