| 摘要 |
PURPOSE:To perform the ring forging of the material difficult to forge without causing a surface flaw by performing the ring forging by covering the inner peripheral face of a forging blank with a metal. CONSTITUTION:In case of performing a ring forging on the material difficult to forge of a Ni base super heat resistant alloy, etc., a cylindrical metal 2 is fitted with its welding to the inner diameter side of a ring forging blank 1 and the forging is performed by the upper roll 3 and lower roll 4 of a ring forging machine. It is cooled on completion of the forging and the metal 2 at the inner diameter side is removed by a lathe machining. The cooling of the inner diameter side surface of the material difficult to forge is thus prevented and the generation of flaw on the inner diameter side can be prevented.
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