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公开(公告)号：EP1607148A4
公开(公告)日：2006-05-31
申请号：EP04723362
申请日：2004-03-25
Applicant: SUMITOMO METAL IND
Inventor： IWAMOTO HIROYUKI , YAMANE AKIHITO , EGOSHI TOORU , SASAKI KENICHI
CPC classification number: B21B17/04 , B21B37/78 , B21B2015/0028
Abstract: A method of manufacturing a seamless tube by applying drawing/rolling and fixed diameter rolling to a raw seamless tube, comprising the steps of obtaining, beforehand, the wall thickness varying portion of the seamless tube where the thickness of the seamless tube varies in the circumferential direction, and drawing/rolling the seamless tube so that the thickness of the drawn/rolled raw seamless tube at a portion corresponding to the wall thickness varying portion is differentiated from the thickness of the seamless tube at general portions other than that portion to suppress the occurrence of the thick wall varying portion in the seamless tube. Thus, the wall thickness of the seamless tube is prevented from being partially varied in the circumferential direction.
Abstract translation: 一种无缝管的制造方法，其特征在于，对原料无缝管实施拉拔轧制和固定直径轧制，其特征在于，预先取得无缝管的壁厚变化部， 方向进行拉伸/轧制，使得与壁厚变化部对应的部分的拉伸轧制原料无缝管的厚度与该部分以外的一般部分的无缝管的厚度不同， 在无缝管中出现厚壁变化部分。 因此，防止了无缝管的壁厚在圆周方向上局部变化。
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公开(公告)号：DE602004029995D1
公开(公告)日：2010-12-23
申请号：DE602004029995
申请日：2004-03-25
Applicant: SUMITOMO METAL IND
Inventor： IWAMOTO HIROYUKI , YAMANE AKIHITO , EGOSHI TOORU , SASAKI KENICHI
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Patent Agency Ranking
公开(公告)号：CA2519815C
公开(公告)日：2009-02-03
申请号：CA2519815
申请日：2004-03-25
Applicant: SUMITOMO METAL IND
Inventor： SASAKI KENICHI , EGOSHI TOORU , YAMANE AKIHITO , IWAMOTO HIROYUKI
Abstract: When manufacturing a seamless pipe by carrying out elongation rolling and sizing on a mother tube for forming a seamless pipe, the occurrence of portions of thickness variation in the seamless pipe is suppressed by previously identifying the portions of wall thickness variation where the thickness varies in the circumferential direction of the seamless pipe, and carrying out elongation rolling so that the thickness of the portions of the mother tube corresponding to the portions o f wall thickness variation of the seamless pipe are different in thickness at the completion of elongation rolling from that of other portions of the mother tube. As a result, local variations in wall thickness in the circumferential direction of a seamless pipe are prevented.
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公开(公告)号：CA2519815A1
公开(公告)日：2004-10-07
申请号：CA2519815
申请日：2004-03-25
Applicant: SUMITOMO METAL IND
Inventor： IWAMOTO HIROYUKI , SASAKI KENICHI , EGOSHI TOORU , YAMANE AKIHITO
Abstract: A method of manufacturing a seamless tube by applying drawing/rolling and fixed diameter rolling to a raw seamless tube, comprising the steps of obtaining, beforehand, the wall thickness varying portion of the seamless tu be where the thickness of the seamless tube varies in the circumferential direction, and drawing/rolling the seamless tube so that the thickness of th e drawn/rolled raw seamless tube at a portion corresponding to the wall thickness varying portion is differentiated from the thickness of the seamle ss tube at general portions other than that portion to suppress the occurrence of the thick wall varying portion in the seamless tube. Thus, the wall thicknes s of the seamless tube is prevented from being partially varied in the circumferential direction.
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公开(公告)号：ZA200507391B
公开(公告)日：2006-06-28
申请号：ZA200507391
申请日：2005-09-17
Applicant: SUMITOMO METAL IND
Inventor： IWAMOTO HIROYUKI , YAMANE AKIHITO , EGOSHI TOORU , SASAKI KENICHI
IPC: B21B20060101 , B21B15/00 , B21B17/04 , B21B37/78
Abstract: When manufacturing a seamless pipe by carrying out elongation rolling and sizing on a mother tube for forming a seamless pipe, the occurrence of portions of thickness variation in the seamless pipe is suppressed by previously identifying the portions of wall thickness variation where the thickness varies in the circumferential direction of the seamless pipe, and carrying out elongation rolling so that the thickness of the portions of the mother tube corresponding to the portions of wall thickness variation of the seamless pipe are different in thickness at the completion of elongation rolling from that of other portions of the mother tube. As a result, local variations in wall thickness in the circumferential direction of a seamless pipe are prevented.
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公开(公告)号：BRPI0408939A
公开(公告)日：2006-04-04
申请号：BRPI0408939
申请日：2004-03-25
Applicant: SUMITOMO METAL IND
Inventor： IWAMOTO HIROYUKI , YAMANE AKIHITO , EGOSHI TOORU , SASAKI KENICHI
Abstract: When manufacturing a seamless pipe by carrying out elongation rolling and sizing on a mother tube for forming a seamless pipe, the occurrence of portions of thickness variation in the seamless pipe is suppressed by previously identifying the portions of wall thickness variation where the thickness varies in the circumferential direction of the seamless pipe, and carrying out elongation rolling so that the thickness of the portions of the mother tube corresponding to the portions of wall thickness variation of the seamless pipe are different in thickness at the completion of elongation rolling from that of other portions of the mother tube. As a result, local variations in wall thickness in the circumferential direction of a seamless pipe are prevented.
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公开(公告)号：AR044226A1
公开(公告)日：2005-09-07
申请号：ARP040101260
申请日：2004-04-15
Applicant: SUMITOMO METAL IND
Inventor： IWAMOTO HIROYUKI , YAMANE AKIHITO , EGOSHI TOORU , SASAKI KENICHI
Abstract: Procedimiento para farbricar tubos sin costura llevando a cabo laminación de estiramiento (2) y calibración (3) en un tubo madre para formar un tubo sin costura, , con lo cual la ocurrencia de porciones con variación de espesor en el tubo sin costura es eliminada identificando previamente las porciones con variacion de espesor de pared donde varía el espesor en dirección circunferencial del tubo sin costura y llevando a cabo la laminación de estiramiento (2) de manera que el espesor de las porciones del tubo madre que corresponden a las porciones con variación de espesor de pared del tubo sin costura son diferentes en espesor al completar la laminación de estiramiento (2) de aquellos de las otras porciones del tubo madre. Como resultado, se eliminan las variaciones locales en espesor de pared en dirección circunferencial del tubo sin costura.
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