| 摘要 |
PROBLEM TO BE SOLVED: To provide a centrifugal forging method which can obtain a cylinder member of flake graphite cast iron excellent in quality in which favorable flake graphite is distributed almost uniformly while improving production efficiency.SOLUTION: A cylindrical member 10 of flake graphite cast iron is obtained by solidifying molten metal L poured into a cylindrical metal mold 18 by a centrifugal force of the cylindrical metal mold 18 at rotation while making the molten metal progress along an internal peripheral face 18a of the cylindrical metal mold 18. At this time, during a period when the molten metal L is within a temperature range (crystallization temperature) in which flake graphite with A-type graphite as a main component is crystallized, the cylindrical metal mold 18 is rotated at a first rotation number, and cooled. Then, after a temperature of the molten metal L is lowered to lower than the crystallization temperature, the cylindrical metal mold 18 is rotated at a second rotation number larger than the first rotation number, and the molten metal L is cooled. |
