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Title:
【発明の名称】管状部材の超音波透過特性の改善方法
Document Type and Number:
Japanese Patent JPH078394
Kind Code:
B2
Abstract:
PURPOSE:To secure a prescribed inner diameter and to uniformly forge a whole periphery by inserting a core metal of a prescribed dimension in the part requiring an ultrasonic transmissivity on an austenitic stainless cast steel tubular member. CONSTITUTION:A part 1 to be forged of a valve 7 for a nuclear power plant for example, is placed on a lower tap 4 set on a lower anvil 6. Here, an upper anvil 5 is set on a press. Then, the core metal 2 possessed of the outer diameter matched to the inner diameter of the product is inserted inside the part 1 and then said part is forged by pressing the upper tap 3 through the anvil 5 by the press. In this case, at first, after the part 1 is brought into contact with a coremetal 4 the press force is applied to the part 4 where the taps 3, 4 and the part 1 are brought into contact to forge uniformly regardless of the surface ruggedness. Furthermore, for performing this forging on the peripheral direction, the anvil 5 is lifted to rotate the valve body 7 and then the next part is forged again and this working is repeated.

Inventors:
Toshiyuki Koto
Shirai Tsubasa
Kenichi Tomomatsu
Manabe Yoshihisa
Mizuguchi Masaaki
Kenji Shibata
Oshima Yoshimitsu
Application Number:
JP24622285A
Publication Date:
February 01, 1995
Filing Date:
November 05, 1985
Export Citation:
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Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
Toa Valve Co., Ltd.
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21J5/00; B21D31/06; B21J1/00; B21J13/02; G21C17/00; G21C17/003; (IPC1-7): B21J1/00
Domestic Patent References:
JP5488130U
JP5555241U
Attorney, Agent or Firm:
Akira Uchida (2 outside)