| 摘要 |
PURPOSE:To produce the title main die body capable of easily carrying out vacuum suction, etc., by providing many through holes penetrating both front and rear, and gradually increasing the diameter of the through hole from the front toward the rear at the time of forming the main die body by electrocasting. CONSTITUTION:The surface of a mandrel 5 is firstly polished with an abrasive to remove impurities, and the surface is roughed. A spray soln. consisting of a pasty silver lacquer, a butyl acetate soln., and a vinyl chloride lacquer soln. is sprayed on the desired surface to be electrocast to form a sprayed layer 8 in >=about 15mu thickness. Since the sprayed layer 8 is low in electric conductivity, many through holes 2 are easily formed on the surface of the mandrel 5. The mandrel 5 is then dipped in the electrolyte 3 in an electrolytic cell A along with an electrocasting material 4, and the electric current at about 3A per 100cm<2> area of the mandrel 5 is applied from an electric power source S between the mandrel 5 and the electrocasting material 4. Consequently, the main die body 1 having many through holes 2 penetrating both front and rear is formed, and the diameter of the through hole is gradually increased from the front toward the rear (the maximum diameter is about 0.1-0.5mm).
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