Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Reexamination Certificate
2006-01-24
2006-01-24
Tolan, Ed (Department: 3725)
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
C072S209000
Reexamination Certificate
active
06988387
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.
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Edited by The Japan Society for Technology of Placity, “Boston Katachi Kan'atsutei Sekai o Lead Suru Atsutei Gijutsu”, Koronasha Kabushiki Kaisha, p. 151 (cited in Search Report); Aug. 20, 1991.
Anraku Toshiro
Nakaike Hirotsugu
Shimoda Kazuhiro
Yamakawa Tomio
Clark & Brody
Sumitomo Metal Industries Ltd.
Tolan Ed
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