| 摘要 |
PROBLEM TO BE SOLVED: To dress a hemispherical tool by making it come into contact with a gel coating inclusive of abrasive grains formed in a formed positive electrode, as relatively rotating a grinding tool and this formed electrode. SOLUTION: A formed negative electrode 26 is opposedly installed in a recess 20a of a positive electrode hold-down member 20 at an opposite minute intervalδto a formed electrode 18. A desired d.c. voltage or current is impressed to a gap between the formed electrode 18 and the formed electrode 26. When an electrode field is formed in a grinding fluid in space between the electrode 18 and the electrode 26, a surface of the formed electrode 18 attracts abrasive grains by an electrophoretic phenomenon. Therefore, the abrasive grains are hydrophobicly adsorbed on a surface of the electrode 18, forming a gel coating being high in grain density. In this state intact, a ball grinding wheel 30 is dressed by making it come into contact with the gel coating formed on the surface of the electrode 18, as rotating this ball grinding wheel 30 and the electrode 18.
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