公开(公告)号：EP3127624A4

公开(公告)日：2017-04-26

申请号：EP15772740

申请日：2015-03-30

Applicant: JFE STEEL CORP

Inventor： HORIE MASAYUKI ,  YASUHARA ISAMU ,  TAMURA YUKUYA ,  TANIICHI KENJI

IPC: B21D5/01

CPC classification number: B21D5/015

公开(公告)号：EP3225321A4

公开(公告)日：2017-12-27

申请号：EP15863977

申请日：2015-11-12

Applicant: JFE STEEL CORP

Inventor： HORIE MASAYUKI ,  TAMURA YUKUYA ,  MIWA TOSHIHIRO ,  TATENO JUNICHI

IPC: B21D5/01

CPC classification number: B21D5/01 ,  B21D5/015

Abstract: Provided are a method of producing a steel pipe by performing bending on a plate material, and a press die used in the method. A method of producing a steel pipe in which a plate material having an end bending portion is subjected to at least one bending along its widthwise direction to form a preformed body having a U-shaped cross-section, an open pipe with a gap portion in a longitudinal direction is formed by adding a bending force to the preformed body to press the preformed body, and end surfaces of the gap portion of the open pipe are butt-joined to each other to form a steel pipe, the method including: providing a lightly-bent portion to which very slight curvature is applied as compared to other regions, or providing a non-bent portion in which the bending is omitted, in at least a part of the plate material, in performing bending on the plate material; and applying the bending force to a part spaced apart at least from the center of the lightly-bent portion or the non-bent portion in a width end portion direction of the plate material by amount of W/4 (where, W is a width size of the plate material), without constraining the lightly-bent portion or the non-bent portion, in pressing the preformed body into the open pipe.

公开(公告)号：EP3127625A4

公开(公告)日：2017-08-02

申请号：EP15773059

申请日：2015-03-30

Applicant: JFE STEEL CORP

Inventor： HORIE MASAYUKI ,  TAMURA YUKUYA ,  MIWA TOSHIHIRO ,  NISHIMURA TOMOMI ,  USHIO TOMIZO ,  TANIICHI KENJI

IPC: B21D5/01 ,  B21C37/08

CPC classification number: B21D5/015 ,  B21C37/0815

Abstract: Provided is a method for forming a steel pipe for forming a steel plate as raw material into a substantially cylindrical shape, by first half forming performing three-point bending-press a plurality of times from one plate width end portion of the steel plate as raw material toward a plate width center, second half forming performing three-point bending-press a plurality of times from the other plate width end portion toward the plate width center, and final forming performing the three-point bending-press on the plate width central portion, wherein the first half forming is divided into preceding forming performed before the second half forming and succeeding forming performed after the second half forming, and a ratio of a forming range in the preceding forming to the steel plate width is set in a range of more than 0.17 to less than 0.46. Thus, a producible maximum diameter of the steel pipe is enlarged without modifying the equipment of the existing pressing machine.

Abstract translation: 本发明提供一种将作为原材料的钢板成形为大致圆筒状的钢管的成形方法，其中，从钢板的一个板宽端部多次进行三点弯曲加压成形为原料 材料朝向板宽中心，第二半成形件从另一板宽端部朝向板宽中心多次进行三点弯曲加压，并且最终成形在板宽中心进行三点弯曲加压 其中第一半成形被分成在第二半成形之前进行的在先成形和在第二半成形之后进行的成形，并且在前成形中成形范围与钢板宽度的比率被设定在 大于0.17至小于0.46。 因此，可以在不改变现有压机的设备的情况下扩大钢管的可生产最大直径。

公开(公告)号：EP3006129A4

公开(公告)日：2016-06-22

申请号：EP13885877

申请日：2013-05-30

Applicant: JFE STEEL CORP

Inventor： HORIE MASAYUKI ,  TAMURA YUKUYA ,  MIWA TOSHIHIRO ,  HORIGIWA KOUZI

IPC: B21D5/01 ,  B21C37/08

CPC classification number: B21D5/015 ,  B21C37/0815

Abstract: Provided are a method of press-forming a steel pipe with a small variation in a seam gap at butt welded portion and a method of manufacturing a steel pipe. In a method of press-forming a steel pipe by forming a steel plate by applying press bending to the steel plate a plurality of times, in accordance with a relationship obtained in advance between an additional pressing-down amount which is required further after a state that a predetermined seam gap is formed during applying press bending of a final time to an open seam pipe which is a material to be formed and the predetermined seam gap, forming with the additional pressing-down amount based on the relationship is applied to the open seam pipe from the state that the predetermined seam gap is formed during applying press bending of the final time to the open seam pipe which is the material to be formed.

公开(公告)号：EP3000540A4

公开(公告)日：2016-06-08

申请号：EP13885172

申请日：2013-05-20

Applicant: JFE STEEL CORP

Inventor： TAMURA YUKUYA ,  WADA NORIO

IPC: B21C37/08 ,  B23K9/025 ,  B23K26/044 ,  B23K26/262 ,  B23K37/053

CPC classification number: B23K37/0535 ,  B23K9/0253 ,  B23K26/044 ,  B23K26/262

Abstract: An offset correction controller in a continuous tack welding machine of the present invention constrains a cylindrical steel plate using a plurality of cage rolls, butts edges in the width direction of the steel plate, and continuously performs tack welding. The offset correction controller includes a detection unit that detects an offset amount between the edges in the width direction of a butted portion of the steel plate, and an offset correction control unit that adjusts constraining forces of the cage rolls arranged on both sides of the butted portion such that the offset amount becomes smaller than a certain value when the offset amount detected by the detection unit is equal to or larger than the certain value, and reduces the constraining forces of other cage rolls when the offset amount does not become smaller than the certain value after the adjustment of the constraining forces of the cage rolls arranged on both sides of the butted portion.

公开(公告)号：EP3132879A4

公开(公告)日：2017-04-26

申请号：EP15780550

申请日：2015-04-15

Applicant: JFE STEEL CORP

Inventor： HAYAKAWA NAOYA ,  TAMURA YUKUYA ,  MORIMOTO YUTA

IPC: B23K9/173 ,  B21C37/08 ,  B23K9/025 ,  B23K9/032 ,  B23K9/235 ,  B23K101/06

CPC classification number: B21C37/08 ,  B23K9/0253 ,  B23K9/0325 ,  B23K9/173 ,  B23K9/235 ,  B23K2201/06

Abstract: Provided is a tack welding method that, in welding of a large-diameter welded steel pipe or tube, enables an increase in welding speed while preventing humped beads, burn through, and incomplete fusion. In the tack welding method, tack welding is performed continuously on edges (1a) of an open pipe or tube (1) in a production process for a large-diameter welded steel pipe or tube. The tack welding is performed by gas metal arc welding in which a welding current of 1000 A or greater is supplied to a solid welding wire (3) of 4.8 mm or greater in diameter that is attached to contact tip (2), while maintaining a distance of 25 mm or greater between an outer surface of the edges (1a) and a lower end of the contact tip (2).

Abstract translation: 本发明提供一种粘性焊接方法是，在大直径的焊接钢管的焊接，能够增加在焊接速度，同时防止隆起珠，烧穿，和未熔合。 在点焊方法，点焊是在生产过程中连续地执行在一个开放的管或管（1）的边缘（1a），用于大直径的焊接钢管。 钉焊接通过气体金属电弧在哪个焊接1000或更大的焊接电流被提供给实心焊丝（3）为4.8毫米或更大的直径并连接到接触尖端（2）进行的，同时保持 的在边缘处的外表面（1a）的25mm或更大之间的距离和接触尖端的下端（2）。

公开(公告)号：EP3006128A4

公开(公告)日：2016-06-29

申请号：EP13885748

申请日：2013-05-29

Applicant: JFE STEEL CORP

Inventor： HORIE MASAYUKI ,  TAMURA YUKUYA ,  MIWA TOSHIHIRO ,  HORIGIWA KOUZI

IPC: B21D5/01 ,  B21C37/08

CPC classification number: B21D5/015 ,  B21C37/0815

Abstract: In a method of manufacturing a welded steel pipe using a press bending method of performing three-point bending press forming on a raw material steel plate by a pair of dies disposed in a steel plate feeding direction at a predetermined gap, and a punch configured to press the steel plate between the pair of dies to form an open pipe and then welding the open pipe to manufacture a steel pipe, when the open pipe is formed such that after performing first half press forming from one width end portion of the steel plate toward a width center (provided, leaving the width center unpressed), second half press forming is performed from a width end portion of an opposite side toward the width center (provided, leaving the width center unpressed), and the width center is finally subjected to final press forming to form an open pipe, the steel pipe supported on the dies of the steel plate width center side is assumed to be a non-formed portion in a final pass of the second half press forming, thereby manufacturing the open pipe in which the amount of offset of a welded part is small.