ELECTROCHEMICAL MACHINING METHOD, ELECTROCHEMICAL MACHINING DEVICE, AND ELECTROCHEMICAL MACHINING SOLUTION

摘要

In order to separate and remove sodium tungstate (Na₂WO₄) resulting from machining, the present invention provides a method for electrochemically machining a superhard alloy while switching the polarity, the method having a configuration wherein an aqueous common-salt solution (aqueous NaCl solution) or an aqueous sodium nitrate solution (Na(NO₃)) is used as an electrochemical machining solution and a calcium salt is added beforehand to the electrochemical machining solution, thereby reacting the sodium tungstate (Na₂WO₄) resulting from the electrochemical machining with the calcium salt to yield calcium tungstate (CaWO₄), and the calcium compound is separated and recovered on the basis of a difference in specific gravity.