The method of manufacturing a rotor using a titanium alloy

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PROBLEM TO BE SOLVED : To provide a rotor and its manufacture method which improves effective utilization factor of an expensive material such as a titanium alloy, attaining reduction in work cost and improvement in the yield of the material, and is high strength and low in inertia. SOLUTION : In this method of manufacture, a titanium alloy large thickness cylinder 11 is plastically worked by a super plastic gas pressure molding method into a different diameter cylindrical member provided with a shaft part 11b and a rotor peripheral part reinforced ring 11a, in the reinforced ring 11a, a high energy product rate-earth magnet and a core material or the like are housed, in a rotor using a titanium alloy. In a different diametric cylinder member concurrently provided with a structure of shat part 11b and rotor peripheral part reinforced ring 11a of the titanium alloy large thickness cylinder 11 by the super plastic gas pressure molding method, plastic work is applied.