| 摘要 |
PROBLEM TO BE SOLVED: To enable to manufacture the sectional thickness of a gear box for rolling stock, especially, the thickness of a thin thickness part always into a desired thickness. SOLUTION: This method manufactures split boxes 10 in a separating type gear box constituted by assembling both opening parts of two split boxes 10 by casting using a mold 2 provided with a main mold 2 and a core 4. Also, this method for manufacturing the split boxes made of the ductile cast iron comprises the processes that are: a chaplet 7 is set between the core 4 and the upper surface of the main mold 2, the molten ductile cast iron is poured into the mold 2, and after melting only the surface of the chaplet 7, the molten metal and the chaplet are stuck to manufacture the ductile cast iron-made split boxes by constituting the separating type gear box. COPYRIGHT: (C)2008,JPO&INPIT
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