Kawasaki Steel Corporation

Shinohara Press Service Co., Ltd.

Other

Doryokuro Kakunenryo Kaihatsu Jigyodan

Nippon Kinzoku Co., Ltd.

Inter-University Research Institute Corporation

Kiyohiko Nohara

Akira Yamamoto

Shigeki Kato

Hideyoshi Nakamura

Masayuki Shinohara

Hitoshi Hayano

Masashi Yamanaka

Nobuyuki Kawabata

Takayuki Saeki

Tomoo Tanaka

Yutaka Oka

Nobuo Ohashi

Junichi Shimomura

Yutaka Ono

Shunichi Yuhara

Osamu Masuko

Terufumi Sasaki

Kyohei Miyajima

Tetsuo Miyawaki

Targeting mass production, the present invention provides an advanced method of manufacturing pure niobium plate end-group components from pure niobium plate material for superconducting high frequency accelerator cavity by means of innovative shear-blanking followed by innovative forging procedures, wherein the invention is to convert the procedure/production method from the conventional machining or waterjet cutting followed by the conventional cold forging to the whole press-forming The invention gives the drastic effects on cost-effectiveness and press-performance.

Method of manufacturing pure niobium plate end-group components for superconducting high frequency accelerator cavity

End-group components for superconducting accelerator cavity used in acceleration of charged particles are manufactured by subjecting pure niobium sheet materials to press forming composed mainly of flat-bottomed cylindrical drawing, preferably by simultaneously conducting control of slide velocity and/or its motion and control of tool die temperature and/or its distribution/gradient in the above press forming, further preferably by dynamically controlling blank holding force in accordance with the variation of flange area, flange thickness and deformed characteristics of niobium sheet materials during the press forming, more preferably by preparing an anisotropically shaped blank instead of a circular blank by use of servo press forming machine, servo-die cushion temperature control equipment, water-soluble solid coating type lubricant, and a tooling die.

Method of manufacturing end-group components with pure niobium material for superconducting accelerator cavity

A method of producing metallic materials for the components of nuclear reactors is disclosed, which comprises adding a boron-=containing material having a value of .sup.11 B/(.sup.10 B+.sup.11 B) larger than that of natural boron to molten metal before deboronification refining. The resulting metallic materials are used even under neutron irradiation without causing .sup.10 B(n, .alpha.).sup.7 Li nuclear reaction.

Method of producing metallic materials for the components of nuclear

Stainless steels for springs having a high strength and an excellent fatigue resistance are produced by heat treating austenitic stainless steels having such a composition that austenite stability index, Md.sub.30. is 0.degree. C. to +80.degree. C. at a final annealing temperature of 750.degree.-1,150.degree. C., subjecting the thus treated steels to a primary working at a temperature from Md.sub.30 to 500.degree. C. at a reduction rate of not less than 20% and then subjecting said steels to a secondary working at a temperature lower than Md.sub.30 at a reduction rate of not less than 30%.

Process for producing stainless steels for spring having a high strength

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Chiba, Japan

Kiyohiko Nohara