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    METHOD OF MANUFACTURING SEAMLESS STEEL PIPE
    1.
    发明公开
    METHOD OF MANUFACTURING SEAMLESS STEEL PIPE 有权
    VERFAHREN ZUR HERSTELLUNG EINES NAHTLOSEN STAHLROHRS

    公开(公告)号：EP1479457A4

    公开(公告)日：2005-08-17

    申请号：EP03734615

    申请日：2003-01-27

    Applicant: SUMITOMO METAL IND

    Inventor： SASAKI KENICHI ,  YAMANE AKIHITO

    IPC: B21B17/02 ,  B21B17/04 ,  B21B17/14 ,  B21B37/18 ,  B21B37/78 ,  B21B38/04

    CPC classification number: B21B37/78 ,  B21B17/02 ,  B21B17/04 ,  B21B17/14 ,  B21B38/04 ,  B21B2261/04

    Abstract: A method of manufacturing a seamless steel pipe capable of suppressing a nonuniform wall thickness produced in a pressing down direction of a mandrel mill as well as a nonuniform wall thickness produced at positions displaced from the pressing down direction, comprising the steps of rolling a seamless steel pipe in a production line comprising the mandrel mill (11) having a plurality of stands (111 to 115) with hole type rolls continuously disposed with the pressing down directions thereof differentiated from each other, measuring the wall thickness of the rolled steel pipe (14) in a circumferential direction, and based on the measured results, individually controlling the both side closed amounts of the hole type roll at least in the pair of final pressing down stands (114, 115) of the mandrel (11) so that the nonuniform wall thickness becomes minimum.

    Abstract translation: 一种无缝钢管的制造方法，其不仅能够抑制在芯棒式无缝管轧机中的减少方向上发生的壁厚偏差，而且抑制在偏离方向的位置发生的厚度的导数：测量壁厚 在包括由多个还原架111〜115构成的芯棒式无缝管轧机11的生产线的圆周方向上，在具有还原辊的方向上相继配置的还原辊彼此相互变化，并分别控制 分别基于测量结果，在芯棒式无缝管轧机11的最终轧制机架中的还原辊114,115的各轴的两端的位置，从而能够使壁厚的偏差最小化。

    ROLLING CONTROL METHOD FOR MANDREL MILL, ROLLING CONTROL DEVICE, CONTROL PROGRAM, AND SEAMLESS TUBE
    2.
    发明公开
    ROLLING CONTROL METHOD FOR MANDREL MILL, ROLLING CONTROL DEVICE, CONTROL PROGRAM, AND SEAMLESS TUBE 有权
    轧钢控制方法轧管机，轧控制设备的控制程序和无缝管

    公开(公告)号：EP1779939A4

    公开(公告)日：2008-08-06

    申请号：EP05765198

    申请日：2005-06-30

    Applicant: SUMITOMO METAL IND

    Inventor： YAMANE AKIHITO ,  SASAKI KENICHI ,  NAKAIKE KOUJI

    IPC: B21B17/02 ,  B21B17/04 ,  B21B37/78

    CPC classification number: B21B17/04 ,  B21B37/78 ,  B21B38/04

    Abstract: A rolling control method for a mandrel mill, a rolling control device, a control program, and a seamless tube. In the method, the press-down position of a first hole type rolling roll disposed on a finish stand (#i) is displaced outward when a raw tube (S) is rolled on the finish stand (#i) among stands forming the mandrel mill (M). Also, the press-down position of a second hole type rolling roll disposed on an upstream side stand (#(i-2)) is displaced outward when a raw tube is rolled on the upstream side stand (#(i-2)) with the same press-down direction as the finish stand (#i) positioned nearest the finish stand (#i). Accordingly, when the seamless tube is manufactured by using the mandrel mill, a part or all of the end part of the raw tube can be accurately rolled to a specified thickness.

    DEVICE AND METHOD FOR DETECTING FLAW ON TUBE
    7.
    发明公开
    DEVICE AND METHOD FOR DETECTING FLAW ON TUBE 有权
    设备和方法的检测上破管道

    公开(公告)号：EP1918034A4

    公开(公告)日：2009-08-26

    申请号：EP06782094

    申请日：2006-08-01

    Applicant: SUMITOMO METAL IND

    Inventor： SASAKI KENICHI

    IPC: B21B37/78 ,  B21B17/02 ,  B21C51/00

    CPC classification number: B21C51/00 ,  B21B17/04 ,  B21B37/78 ,  B21B38/04 ,  B21B38/08 ,  B21B2261/04 ,  B21B2265/12

    Abstract: A detection device and a detection method for automatically detecting flaws occurring on a raw tube manufactured by rolling a hollow shell by using a mandrel mill. The flaw detection device (100) comprises a wall thickness gauge (1) disposed on the extension side of the mandrel (M) and measuring the wall thicknesses of the hollow shell (P) in a press-down direction on the stands (#1 to #5) of the mandrel, rolling load measuring devices (2) measuring rolling loads on the stands (#1 to #5), and an judgement device (3) for judging whether flaws are present or absent on the raw tube based on the measured wall thickness values of the hollow shell (P) in the press-down direction and the measured rolling load values on the stands. The judgement device (3) judges that flows occur on the raw tube when the measured wall thickness value of the hollow shell in the press-down direction on any of the stands (#1 to #5) partially varies a predetermined amount or more and the measured rolling load value of the hollow shell in the press-down direction on any of the stands (#1 to #5) partially varies a predetermined amount or more.

    PROCESS FOR PRODUCING SEAMLESS STEEL PIPE
    8.
    发明公开
    PROCESS FOR PRODUCING SEAMLESS STEEL PIPE 审中-公开
    用于生产无缝钢管

    公开(公告)号：EP1878514A4

    公开(公告)日：2009-01-07

    申请号：EP06713910

    申请日：2006-02-16

    Applicant: SUMITOMO METAL IND

    Inventor： SASAKI KENICHI

    IPC: B21B17/02 ,  B21B17/04

    CPC classification number: B21B17/04 ,  B21B3/02 ,  B21B37/78 ,  B21B2275/06

    Abstract: This invention provides a process for producing a seamless steel pipe that can produce a seamless steel pipe while effectively suppressing a failure of a mandrel bar to be withdrawn after stretch-rolling of a rolling material formed of a high alloy steel containing not less than 5% of Cr. In the production process, a seamless steel pipe comprising a high alloy steel containing not less than 5% of Cr is produced by stretch-rolling a rolling material (3) using a retained mandrel mill (1) for maintaining the speed of a mandrel bar (2) in an axial direction at a constant value while regulating the movement speed of the mandrel bar (2) by the retained mandrel mill (1) so as to satisfy a requirement represented by formula 0.15 ≤ Vb/{(Vi + Ve)/2} ≤ 0.70 wherein Vb represents the movement speed of the mandrel bar (2); Vi represents the speed of the rolling material (3) on the inlet side of the retained mandrel mill (1); and Ve represents the speed of the rolling material (3) on the outlet side of the retained mandrel mill (1).

    METHOD OF MANUFACTURING SEAMLESS TUBE
    9.
    发明公开
    METHOD OF MANUFACTURING SEAMLESS TUBE 有权
    VERFAHREN ZUR HERSTELLUNG EINES NAHTLOSEN ROHRS

    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

    IPC: B21B15/00 ,  B21B17/04 ,  B21B37/78 ,  B21B17/02 ,  B21B23/00

    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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