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1. 发明专利

JPH0363331A PIPING EXECUTION 失效
公开(公告)号：JPH0363331A
公开(公告)日：1991-03-19
申请号：JP19632689
申请日：1989-07-28
申请人： JGC CORP , NIKKI KOJI KK , NIPPON STEEL CORP
发明人： INOUE KAZUMASA , SASANO HAYASHI , YAMAMOTO KATSUMI , TAKESHITA HITOSHI , KOMI NOBORU , IGARASHI MIKIO , MIYAGAWA KATSUHIKO , YAMAZAKI TAKESHI , TSURUTA HIDEO
IPC分类号： E03B7/00 , E03C1/02 , F16L1/00
摘要： PURPOSE:To reduce the number of welding spots and to shorten a term of works by a method wherein, in execution of a piping work in which a piping route is complicated and narrow and which is attended with stereo bending, piping is made such that a steel pipe in a coil is uncoiled as the tip of the steel pipe is coarsely bent, and both ends are finally interconnected. CONSTITUTION:A steel pipe 2 in a coil 1 has bending of 30-100DR at a part where coarse bending is made at an acutemost angle and bending of approximate 3-5DR by a bending work. Piping is effected such that a tip 21 of the steel pipe is uncoiled as coarse bending along a piping route, and a bending work is finally applied in a given position to interconnect both ends by welding.

2. 发明专利

JPH0213005B2 失效
公开(公告)号：JPH0213005B2
公开(公告)日：1990-04-03
申请号：JP11426885
申请日：1985-05-29
申请人： NIPPON STEEL CORP
发明人： IKEMOTO TAKESHI , SUEHISA MASAYUKI , TSURUTA HIDEO
IPC分类号： C21D8/10 , B21C37/06 , B21C37/08 , C21D9/08

3. 发明专利

JPS61272320A MANUFACTURE OF SEAM WELDED STEEL PIPE SUPERIOR IN WELD ZONE TOUGHNESS 失效
公开(公告)号：JPS61272320A
公开(公告)日：1986-12-02
申请号：JP11426885
申请日：1985-05-29
申请人： NIPPON STEEL CORP
发明人： IKEMOTO TAKESHI , SUEHISA MASAYUKI , TSURUTA HIDEO
IPC分类号： C21D8/10 , B21C37/06 , B21C37/08 , C21D9/08
摘要： PURPOSE:To manufacture seam welded steel pipe superior remarkably in toughness in low temp. of weld zone inexpensively and stably, by austenitizing a seam welded zone, then cooling acceleratedly the zone to refine microstructure, further tempering it and applying warm working thereto. CONSTITUTION:A material steel strip 1 is formed, welded and squeezed continuously by a feeder element 2 and a squeeze roll 3, to form a seam welded pipe 4. Next, the seam welded zone is heated to Ac3 transformation point - that + 150 deg.C range by an induction heating apparatus 5, next, cooled by 20-90 deg.C/sec average rate between >=Ar3 transformation point -

4. 发明专利

JPH0220328B2 失效
公开(公告)号：JPH0220328B2
公开(公告)日：1990-05-09
申请号：JP19047585
申请日：1985-08-29
申请人： NIPPON STEEL CORP
发明人： SAIHATA KAZUMI , TSURUTA HIDEO
IPC分类号： B21D5/12

5. 发明专利

JPS6250018A THIN WALL PIPE FORMING METHOD 失效
公开(公告)号：JPS6250018A
公开(公告)日：1987-03-04
申请号：JP19047585
申请日：1985-08-29
申请人： NIPPON STEEL CORP
发明人： NAHATA KAZUMI , TSURUTA HIDEO
IPC分类号： B21D5/12
摘要： PURPOSE:To stabilize the shape and to increase the production efficiency by making the ratio of the forming arc length to width length, the ratio of the radius of curvature of the forming arc to the radius of curvature of the top roll of the initial forming stand and the ratio of the radius of curvature to the diameter of the pipe respectively at the specified value. CONSTITUTION:The ratio le/L/2 of the forming arc length le at both ends in the width direction of a strip sheet to 1/2 width length L of the strip sheet is taken as >=0.3. The value Re/FF of the ratio of the radius Re of curvature of the forming arc to the radius RF of curvature of the top roll of the initial forming stand of the fin pass formation in the later forming stage is taken as >=1.0 and >=1.4 as well. Moreover, the value delta/D of the ratio of the forming movement quantity delta of the endmost part in the width direction measured inside the plane including the radius of curvature of the forming arc at the end part to the diameter D of a pipe-made pipe is taken as

6. 发明专利

JPS63144907A CUTTING DEVICE FOR SIDE FACE OF STEEL STRIP 失效
公开(公告)号：JPS63144907A
公开(公告)日：1988-06-17
申请号：JP28943686
申请日：1986-12-04
申请人： NIPPON STEEL CORP
发明人： WATANABE HIROSHI , TSURUTA HIDEO , KATO MASAFUMI
IPC分类号： B23C3/12 , B23Q11/08
摘要： PURPOSE:To cut both side faces of a steel strip stably, and make it possible to do the work without an air blow device, by setting a dust screen plate on the front of a cutting edge, as this screen plate contacts with the steel strip, and is rotatably attached to the cutting device for side faces of a steel strip. CONSTITUTION:A support roll 13 is rotatably attached at the lower part of a frame 3, and a screen plate 15 is rotatably attached to a pin 16, as the lower end of this screen plate 15 is on a level with the lower end of the support roll 13. While the rear end of a strip 1 is passing under the support roll 13, this strip 1 bends upwards with its own elasticity to hit the screen plate 15, but the screen plate 15 is brought back to where it was when the rear end of the strip 1 has passed under the support roll 13, by a guide of a guide pin 17, as this screen plate 15 is rotatably supported by the pin 16. Accordingly, it is not occurred that the screen plate 15 is deformed or broken by the shock made by the uncorrected rear end of the strip, and both side faces of the strip can be cut stably, because a flaw due to the pressure of the dust, is not made. Moreover, an air blow device is not necessary as the dust is scattered.

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