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

Title:

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

Document Type and Number:

WIPO Patent Application WO/2015/068184

Kind Code:

A1

Abstract:

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.

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Inventors:

GOTO AKIHIRO (JP)
SAITO NAGAO (JP)
MOHRI NAOTAKE (JP)
HAISHI YUICHIRO (JP)
YUZAWA TAKASHI (JP)

Application Number:

PCT/JP2013/006502

Publication Date:

May 14, 2015

Filing Date:

November 05, 2013

Export Citation:

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Assignee:

MITSUBISHI ELECTRIC CORP (JP)

International Classes:

B23H3/10

Foreign References:

JPH0419016A	1992-01-23
JP2000204356A	2000-07-25
JP2008063599A	2008-03-21