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Patent Searching and Data


Title:
DRILLING/ROLLING METHOD IN MANUFACTURING SEAMLESS TUBE
Document Type and Number:
WIPO Patent Application WO/2004/108310
Kind Code:
A1
Abstract:
A drilling/rolling method in manufacturing a seamless tube capable of suppressing additional shear deformation by suppressing rotational forging effect without so reducing roll diameter, characterized in that the tilt angle (β) of a main roll and the cross angle (&gammad ) of the main roll are held within a range meeting the requirements of the following equations (1) to (3), a relation between the outer diameter (d0) of a solid billet and the outer diameter (d) and wall thickness (t) of a hollow piece after drilling/rolling meets the requirement of the following equation (4), and the inlet diameter (D1), and outlet diameter (D2) of the main roll, and the (d0), (d), and (&gammad ) meet the requirement of the following equation (5). 8º ≤ β ≤ 20º...(1) 5º ≤ &gammad ≤ 35º...(2) 15º ≤ β + &gammad ≤ 50º...(3) 1.5 ≤ - ψrѲ ≤ 4.5...(4) (d/d0)/(0.75 + 0.025 &gammad ) ≤ D2/D1...(5) Where, in equation (4), ψr = 1n (2t/d0), ψѲ = 1n &lcub 2 (d - t)/d0&rcub .

Inventors:
Hayashi, Chihiro c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Application Number:
PCT/JP2004/007698
Publication Date:
December 16, 2004
Filing Date:
June 03, 2004
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Hayashi, Chihiro c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
International Classes:
B21B19/04; (IPC1-7): B21B19/04
Attorney, Agent or Firm:
Honoue, Terutada (Honoue Patent Office, 17-23 Higashinaniwa-cho 5-chom, Amagasaki-shi Hyogo 92, 66008, JP)
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