| 摘要 |
PURPOSE:To produce a cam shaft having stem parts of good machinability and cam parts of high hardness by interposing cylindrical partition plates in the spaces of the stem parts and the spaces of cam parts of a sand mold to part these respectively and casting molten metals of different components simultaneously therein. CONSTITUTION:A stem part space 12, a journal part space 13 and a cam part space 14 are parted to two by means of partition plates 20 of an elliptical cylindrical shape having projections 19. The molten cast iron from a main feed line 17 passes through a supply line 15 and flows into the space 12 and the space 13, whereby the stem part and journal part of good workability are formed. On the other hand, the molten cast iron passing through an another supply path 16 is mixed with metallic components of, for example, Cr, Mo, Ni, etc. in an addition chamber 18, and these are cast into the space 14, whereby the hard cam part is formed. After the casting, the parts projecting from the side end faces of the cam parts of the plates 20 are cut off simultaneously with the finish machining of the stem parts, etc. Thereby, the cam shaft is cast easily and quickly. |
