| 摘要 |
PURPOSE:To provide a centrifugal casting method, by which high quality piston ring base material can be obtd. CONSTITUTION:This centrifugal casting method uses a stack metallic mold 13 with a pouring hole 22 of a cavity 21 for forming plural piston ring base materials open in the inside mold surface 23. The molten metal of Ti Al base intermetallic compound composition supplied into the inside mold surface 23 is poured into each cavity 21 through each pouring hole 22 to form a scrap 27 having larger volume than the sum of the volumes of all cavities 21 developed by excess molten metal in the inside mold surface 23 side. In each cavity 21, the piston ring base material 1 connected to the scrap 27 is formed. At this time, molten metal supplied in the inside mold surface 23 side is divided into each cavity 21 with plural parting walls 25 and the scrap 27 is cut off by these divisions. By this method, shrinkage stress in each divided part 271, 272 is made extremely small and the casting crack of each piston ring crude material 1 can be prevented. |
