| 摘要 |
PURPOSE:To make the melt-sticking between pieces and a casting smooth the to strongly fix both by forming reserving space in a cavity communicating to a sprue, setting pieces having the prescribed shape in the cavity and heating the pieces by molten metal flowing to the reserving space from the sprue through the cavity. CONSTITUTION:In a mold 10, the cavity 11 for forming a cam shaft and the reserving space 15, which is arranged in parallel with the cavity 11 and communicates with the lower part of the cavity 11, are formed. Further, the mold 10 is the split mold, which is dividable horizontally at the upper parts of each cam piece fitting part 12, gear piece fitting part 13 and journal part 14, and the sprue 11a communicated to the upper part of cavity 11 is formed at the upper part of the mold 10. And, cam piece 16 and gear piece 17 are fitted to each the cam piece fitting part 12 and the gear piece fitting part 13, and then, the molten metal is poured from the sprue 11a. The molten metal is filled up from the downstream side of the cavity 11 toward the sprue 11a at upstream side, while flowing to the reserving space 15 after passing the cavity 11. Then, the pieces 16, 17 and a sticking piece 19 are dipped to the molten metal for a long time and heated, and after the surface part of the sticking piece 19 is melted, they are surrounded by new molten metal.
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