公开(公告)号：EP2878390B1

公开(公告)日：2018-01-31

申请号：EP13823801.9

申请日：2013-07-18

申请人： Nippon Steel & Sumitomo Metal Corporation

发明人： YAMANE Akihito

IPC分类号： B21B17/02 ,  B21B23/00 ,  B21B25/06 ,  B21B17/04

CPC分类号： B21B25/02 ,  B21B13/10 ,  B21B17/02 ,  B21B17/04 ,  B21B25/06 ,  B21B2261/04 ,  B21B2261/08

摘要： A manufacturing method of a seamless metal pipe includes: preparing a plurality of mandrel bars in which lengths of work portions which come into contact with a hollow shell during elongating are different from one another; selecting a mandrel bar including a work portion having a length corresponding to the number of stands used in thickness reduction, among the plurality of mandrel bars; inserting the mandrel bar selected in the selecting into the hollow shell; and performing the elongating on the hollow shell into which the mandrel bar is inserted. Moreover, in the elongating, outer diameter reduction is performed by one of a preceding-stage stand group and a succeeding-stage stand group and the thickness reduction is performed by the other of the preceding-stage stand group and the succeeding-stage stand group, or the thickness reduction is performed by both of the preceding-stage stand group and the succeeding-stage stand group.

公开(公告)号：EP2878390A1

公开(公告)日：2015-06-03

申请号：EP13823801.9

申请日：2013-07-18

申请人： Nippon Steel & Sumitomo Metal Corporation

发明人： YAMANE Akihito

IPC分类号： B21B17/02 ,  B21B23/00 ,  B21B25/06

CPC分类号： B21B25/02 ,  B21B13/10 ,  B21B17/02 ,  B21B17/04 ,  B21B25/06 ,  B21B2261/04 ,  B21B2261/08

摘要： A manufacturing method of a seamless metal pipe includes: preparing a plurality of mandrel bars in which lengths of work portions which come into contact with a hollow shell during elongating are different from one another; selecting a mandrel bar including a work portion having a length corresponding to the number of stands used in thickness reduction, among the plurality of mandrel bars; inserting the mandrel bar selected in the selecting into the hollow shell; and performing the elongating on the hollow shell into which the mandrel bar is inserted. Moreover, in the elongating, outer diameter reduction is performed by one of a preceding-stage stand group and a succeeding-stage stand group and the thickness reduction is performed by the other of the preceding-stage stand group and the succeeding-stage stand group, or the thickness reduction is performed by both of the preceding-stage stand group and the succeeding-stage stand group.

摘要翻译： 无缝金属管的制造方法包括：准备多个芯棒，其中在延伸期间与中空壳体接触的长度的工作部分彼此不同; 在所述多个芯棒中选择包括具有对应于在厚度减少中使用的台架数量的长度的工件的芯棒; 将选择的芯棒插入中空壳体中; 并且在插入有芯棒的中空壳体上进行伸长。 此外，在伸长的情况下，通过前级架组和后级架组之一进行外径减小，并且由前级架组和后级架组中的另一台进行厚度减小 ，或者由前级支架组和后级支架组两者进行厚度减小。

公开(公告)号：EP2591865A1

公开(公告)日：2013-05-15

申请号：EP11803621.9

申请日：2011-07-06

申请人： Nippon Steel & Sumitomo Metal Corporation

发明人： YAMANE Akihito

IPC分类号： B21B17/02 ,  B21B27/02

CPC分类号： B21B17/02 ,  B21B17/04 ,  B21B27/024

摘要： [Problem to be Solved] To provide a mandrel mill including a plurality of roll stands in each of which three grooved rolls are disposed, and which can adequately suppress a phenomenon in which a mandrel bar becomes unable to be pulled out from a pipe after drawing and rolling, without resulting in increase in facility cost and deterioration of maintainability, and a method for manufacturing a seamless pipe by using the mandrel mill.
[Solution] A mandrel mill relating to the present invention includes a plurality of roll stands in which three grooved rolls R are disposed in each roll stand such that an angle formed by pressing directions is 120° and the pressing directions of grooved rolls R are alternately shifted by 60° between adjacent roll stands, wherein a central angle θ defining a circular arc that constitutes a groove bottom profile of the grooved roll R disposed at least in the first and second roll stands is set at less than 60°.

摘要翻译： [待解决的问题]提供一种包括多个轧机机架的芯棒式无缝管轧机，每个轧机机架分别设置有三个槽辊，并且能够充分地抑制在拉拔之后芯棒不能从管中拉出的现象 轧制，而不会导致设备成本的增加和可维护性的劣化，以及通过使用芯棒式无缝管轧机制造无缝管的方法。 [解决方案]本发明的芯棒式无缝管轧机包括多个辊架，其中在每个辊架中设置有三个槽辊R，使得由冲压方向形成的角度为120°，并且带槽辊R的加压方向为交替 在相邻的辊架之间移动了60°，其中限定了至少设置在第一和第二辊架中的带槽辊R的凹槽底部轮廓的圆弧的中心角度θ设定为小于60°。

公开(公告)号：EP2591865B1

公开(公告)日：2016-04-27

申请号：EP11803621.9

申请日：2011-07-06

申请人： Nippon Steel & Sumitomo Metal Corporation

发明人： YAMANE Akihito

IPC分类号： B21B17/02 ,  B21B27/02

CPC分类号： B21B17/02 ,  B21B17/04 ,  B21B27/024