To reduce the load of a finishing work after an electroforming by uniforming the thickness of a metal coating film as much as possible regardless of a portion of a master in the electroforming.
A resinous regulation member 4 is fitted to the electroforming master 3 molded to fit to the shape of a water conduction part 2 of a coil 1 while keeping a predetermined interval (g) from the master 3. The master 3 is immersed in an electroplating bath while installing the regulation member 4 to form the metal coating film on the master 3. At this time, a coating film forming speed is lowered by electrically shielding the surface of the master 3 by the regulation member 4 to decrease the current density of the vicinity of the master 3 and when the formation of the coating film is advanced, it is prevented that the coating film directly abuts on the regulation member 4 and is formed to have thickness equal to or above the prescribed distance. Then, after the formation of the coating film is finished and the regulation member 4 is removed, the finishing work is unnecessary on a place where the regulation member 4 is provided to reduce the cost required for the finishing work.
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SUZUKI SHINTARO
TOKUDA ATSUSHI
Higashio Masahiro
Takayoshi Tagawa
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