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Patent Searching and Data


Title:
継目無金属管の製造方法
Document Type and Number:
Japanese Patent JP4155267
Kind Code:
B2
Abstract:
The present invention relates to a making method for a seamless metallic tube with a tilting roll type piercing rolling mill (piercer). According to the making method for a seamless metallic tube of the present invention, the rotary forging effect and the circumferential shearing strain can be significantly suppressed without generating uncompleted engagement of a billet. Accordingly, a product having reduced inside defects and excellent inside quality can be produced in high productivity. Further, by strengthening a plug nose rolling portion, a sharpened plug nose is obtained and an engagement limit can be increased. Additionally, a product further excellent in the inside quality can be efficiently produced. Accordingly, the present invention can be applied to wide fields of the piercing rolling of the seamless metallic tube.

Inventors:
Hiroshi Nakaike
Kazumune Shimoda
Tomio Yamakawa
Toshiro Anraku
Application Number:
JP2004558439A
Publication Date:
September 24, 2008
Filing Date:
December 08, 2003
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21B25/00; B21B19/04; B21B27/02; B21J5/10
Domestic Patent References:
JP3823762B2
JP57050233A
JP2002273505A
JP2142604A
JP10156410A
JP9300007A
Foreign References:
DE4112614A1
Attorney, Agent or Firm:
Michio Mori