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1. 发明专利

JPH05245536A 失效
公开(公告)号：JPH05245536A
公开(公告)日：1993-09-24
申请号：JP8274092
申请日：1992-03-04
申请人： NIPPON KOKAN KK
发明人： SEKINE YUKIO , KONO KENSAKU , KOJIMA SHINJI , MORIHIRA AKIHIRO
IPC分类号： B21C37/08 , B21D5/12
摘要： PURPOSE:To manufacture electric resistance welded tube without excess length by establishing an expression for calculating total length of the electro- resistance-welded tube before and after forming. CONSTITUTION:Since the electric resistance welded tube is drawn in the direction of sheet with in a sizing process, increase of the tube thickness of a steel sheet and elongation of total length is caused. These are expressed as the relational expression II. Further, the relation between the weight, the width and the thickness, etc., of the steel sheet before forming and, the total length of the resistance welded tube after formed are expressed as the relational expression I, and the total length of the steel sheet before forming is derived. In such a way, length to be formed and the number of tubes to be formed of the steel tube is preliminarily calculated and decided, and a futile odd piece is not generated, and the yield can be improved.

2. 发明专利

JPH05208213A SEAM GUIDE ROLL DEVICE FOR MANUFACTURING RESISTANCE WELDED TUBE 失效
公开(公告)号：JPH05208213A
公开(公告)日：1993-08-20
申请号：JP35853891
申请日：1991-12-28
申请人： NIPPON KOKAN KK
发明人： TAKAGI HIROMI , KONO KENSAKU , KOJIMA SHINJI , MORIHIRA AKIHIRO , SEKINE YUKIO
IPC分类号： B21C37/08 , B23K13/00 , B23K37/053 , B23K101/06
摘要： PURPOSE:To secure a lining rod at a fixed position and to undergo remote operation of a pressing amount by providing a lining roll device wherein a lining roll can be moved vertically by an elevation device in one body with a rod for an inside bead cutter device. CONSTITUTION:The lining roll 3 is supported by an elevation device 5 and made up so that it can move vertically to a device body 100. On the upper part of the device body 100 before the lining roll 3 is provided a guide plate 7 to face downward which approaches to the upper part of the lining-roll 3 on one end side and approaches to the lower part in the direction of the end part of the device body 100 on the other end side. Such lining roll 3 is provided in one body with the rod 2 for the inside bead cutter device and the lining roll device 1 is held always at a fixed position between a fin pass roll and a squeeze roll and the pressing amount of the edge part of the lining roll 3 can be controlled at any time in an operating time, therefore, the edge part can be restricted and guided by the lining roll 3 with high accuracy.

3. 发明专利

JPH08295934A PRODUCTION OF HIGH CARBON ELECTRIC RESISTANCE WELDED TUBE EXCELLENT IN WEAR RESISTANCE 失效
公开(公告)号：JPH08295934A
公开(公告)日：1996-11-12
申请号：JP12448695
申请日：1995-04-24
申请人： NIPPON KOKAN KK
发明人： KOJIMA SHINJI , MORIHIRA AKIHIRO , OISHI KUNIYASU
IPC分类号： C21D8/10 , C21D9/08 , C21D9/50 , C22C38/00 , C22C38/04
摘要： PURPOSE: To provide a method for producing an electric resistance welded tube having excellent wear resistance and economically and efficiently producible. CONSTITUTION: A steel having a compsn. contg., by weight, 0.40 to 0.50% C, 0.15 to 0.30% Si, 0.75 to 1.20% Mn, =800 deg.C and is thereafter coiled at >=600 deg.C to prepare a hot rolled steel strip having >=8mm thickness. This hot rolled steel strip is continuously formed into an open pipe and is subjected to electric resistance welding. Next, the weld zone is annealed, which is thereafter heated at 850 to 950 deg.C and is formed into a product electric resistance welded tube without executing tempering.

4. 发明专利

JPH06198330A MANUFACTURE OF ELECTRO-RESISTANCE-WELDED TUBE 失效
公开(公告)号：JPH06198330A
公开(公告)日：1994-07-19
申请号：JP208193
申请日：1993-01-08
申请人： NIPPON KOKAN KK
发明人： SEKINE YUKIO , MORIHIRA AKIHIRO
IPC分类号： B21C37/08 , B21D39/04 , B21D41/04
摘要： PURPOSE:To manufacture an electro-resistance-welded tube without lowering production efficiency and requiring a large equipment cost by colliding the front end of a succeeding electro-resistance-welded tube with the rear end of the preceeding molded and welded electro-resistance-welded tube and joining them as they bite each other. CONSTITUTION:When, a crop 27a at the rear end of the preceeding electro-resistance- welded tube 21a arrives at a pair of caliber rolls 3, it is stopped, the pair of caliber rolls 3 is rolled down to a prescribed roll gap. the preceeding electro-resistance-welded tube 21a is advanced as the crop 27a at the rear end is rolled down and the major diameter is made smaller than the minor diameter. When compression is completed, the pair of rolls 3 opens vertically, the preceeding electro-resistance-welded tube 21a stops, before long the succeeding electro-resistance-welded tube 21b advances and collides with the preceeding electro-resistance-welded tube 21a. Then, since the major diameter of the crop 27a at the rear end of the preceeding electro-resistance-welded tube is worked to be smaller than the minor diameter of the crop 27b at the front end of the succeeding electro-resistance-welded tube 21b, the crops 27b, 27a bite each other to connect the preceeding electro-resistance-welded tube 21a with the succeeding electro-resistance-welded tube 21b.

5. 发明专利

JPH09300015A DEVICE FOR BENDING TIP PART OF COIL 失效
公开(公告)号：JPH09300015A
公开(公告)日：1997-11-25
申请号：JP11895196
申请日：1996-05-14
申请人： NIPPON KOKAN KK
发明人： MORIHIRA AKIHIRO , TODO KUNIO , KUSAKA SHUICHI , SHIBUTA TSUTOMU , SEKINE YUKIO
IPC分类号： B21C37/083
摘要： PROBLEM TO BE SOLVED: To upward bend the tip part of a coil to prevent contact when the tip part of an uncoiled coil is passed through a coil transporting equipment. SOLUTION: At the point of time when the tip part 3 of a coil 6 which is passed through a leveler 5 is projected by a prescribed distance on the downstream side from a support roll 4, the movement of the coil is stopped. Next, by lifting the elevating/lowering roll 1 from below the coil 6, abutting on the undersurface of the tip part 3 of the coil 6, lifting the tip part 3 as it is, abutting the surface of the coil 6 on the support roll 4 and, further lifting it, the tip part 3 of the coil 6 is upward bent. When the tip part 3 of the coil upward bent, the tip part 3 of the coil 6 becomes approximately horizontal coupled with the weight of the coil itself and the transporting equipment is not damaged when the tip part 3 of the coil is passed through the equipment.

6. 发明专利

JPH08295989A HIGH CARBON RESISTANCE WELDED TUBE EXCELLENT IN WEAR RESISTANCE 失效
公开(公告)号：JPH08295989A
公开(公告)日：1996-11-12
申请号：JP12448595
申请日：1995-04-24
申请人： NIPPON KOKAN KK
发明人： KOJIMA SHINJI , MORIHIRA AKIHIRO , OISHI KUNIYASU
IPC分类号： C22C38/00 , C21D8/10 , C21D9/08 , C22C38/04 , C22C38/44
摘要： PURPOSE: To provide a resistance welded tube, after water hardening, with excellent wear resistance by specifying the composition of an Mn-type low alloy steel strip forming the steel tube. CONSTITUTION: The steel strip has a composition consisting of, by weight ratio, 0.40-0.50% C, 0.15-0.30% Si, 0.75-1.20% Mn, =8mm wall thickness is formed by using this steel strip. At the time of coiling the hot rolled steel strip, water cooling for preventing cracking is not performed but slow cooling is performed to accelerate the precipitation of AlN, etc., by which the growth of austenite crystalline grains at subsequent heat treatment can be inhibited. Moreover, after resistance welding, the resulting weld zone of the steel tube is annealed, and then, the steel pipe is heated to the austenitizing temp. and subjected to water cooling and hardening from the inside of the steel tube, by which the wear resistance required of a tube for pipe transport can be provided and this tube can be used without tempering treatment.

7. 发明专利

JPH08295988A HIGH CARBON RESISTANCE WELDED TUBE EXCELLENT IN WEAR RESISTANCE 失效
公开(公告)号：JPH08295988A
公开(公告)日：1996-11-12
申请号：JP12448495
申请日：1995-04-24
申请人： NIPPON KOKAN KK
发明人： KOJIMA SHINJI , MORIHIRA AKIHIRO , OISHI KUNIYASU
IPC分类号： C22C38/00 , C22C38/04 , C22C38/44
摘要： PURPOSE: To provide excellent wear resistance by specifying the composition of an Mn type low alloy steel strip forming a steel tube and controlling austenite crystalline grain, case depth after water hardening, and structure, respectively. CONSTITUTION: The steel strip has a composition consisting of, by weight ratio 0.40-0.50% C, 0.15-0.30% Si, 0.75-1.20% Mn, =5.0 grain size number. This steel is used and formed into resistance welded tube of >=8mm wall thickness. The resulting weld zone is annealed. After heating up to 850-950 deg.C, the tube is water-cooled and quenched from the inner surface of the tube, by which wear resistance is provided to the inner surface of the tube and a tube for pipe transport can be formed. At this time, the amount of as-hardened martensite in the position at a depth of 0.5mm from the inner surface is regulated to >=60%, and also the martensite in the position at a depth of 2.5mm from the inner surface is regulated to

8. 发明专利

JPH06254622A FORMATION OF SQUARE STEEL TUBE 失效
公开(公告)号：JPH06254622A
公开(公告)日：1994-09-13
申请号：JP7100293
申请日：1993-03-05
申请人： NIPPON KOKAN KK
发明人： KOJIMA SHINJI , KONO KENSAKU , MORIHIRA AKIHIRO , SEKINE YUKIO
IPC分类号： B21C37/15
摘要： PURPOSE:To improve the dimensional accuracy of a square steel tube by integrating drum shaped rolls in which bulge degrees of the rolls for forming a side containing a seam welded part are larger than bulge degrees of the other rolls. CONSTITUTION:A round steel tube 1 is rolled by a group of rolling stands into a squire steel tube. The round steel tube is transferred as it is rolled at the preceeding stands Nos.1-2 of the rolling stand 2 under restraint of the round shape. The rolls at the succeeding stands Nos.3-6 bulge at their centers and are drum-shaped. The drum shaped roll in which the bulge of each roll for forming a side containing no seam welded part is made larger than the bulge of the roll for forming a side containing a seam welded part is integrated into the last No.6 stand and the round tube is rolled into the square steel tube. The flatness in the longitudinal direction of the square steel tube and the change of the side length can be reduced.

9. 发明专利

JPH05177402A TUBE END MACHINING DEVICE 失效
公开(公告)号：JPH05177402A
公开(公告)日：1993-07-20
申请号：JP40292
申请日：1992-01-06
申请人： NIPPON KOKAN KK
发明人： MORIHIRA AKIHIRO , KONO KENSAKU , KOJIMA SHINJI , SEKINE YUKIO
IPC分类号： B23B5/16
摘要： PURPOSE:To perform tube end machining accurately by making a copying roller integrated with a tool copy the peripheral surface of a pipe. CONSTITUTION:At the place where the diameter of a steel pipe 21 changes from a small diameter to a large diameter, the force of pushing up a copying roller 3 and a cutting tool 4 works, and a retaining member 5 moves toward a spring 6 while compressing the spring 6. Moreover, at the place where the diameter of the steel pipe 21 changes from a large diameter to a small diameter, a gap is generated between the copying roller 3 and the cutting tool 4 and the steel pipe 21, so the retaining member 5 moves toward the center of a tool mounting plate 2. That is, the copying roller 3 and the cutting tool 4 are brought into contact with the steel pipe 21 at all times while changing the diametrical direction position, according to the change of the outside diameter of the steel pipe 21. Since the copying is outside surface copying, nearly circular copying can be done, and the pipe end machining can be performed accurately.

10. 发明专利

JPH04300115A CUTTING DEVICE FOR BEAD ON INTERNAL SURFACE OF SEAM WELDED PIPE 失效
公开(公告)号：JPH04300115A
公开(公告)日：1992-10-23
申请号：JP8743491
申请日：1991-03-27
申请人： NIPPON KOKAN KK
发明人： TAKAGI HIROMI , KONO KENSAKU , KOJIMA SHINJI , SEKINE YUKIO , MORIHIRA AKIHIRO
IPC分类号： B21C37/30 , B23D1/24 , B23K11/36 , B23K13/00 , B23K37/08
摘要： PURPOSE:To cut off and remove beads from the internal surface of a seam welded pipe without producing a notch, etc., on the internal surface of it and without using a special driving mechanism, etc. CONSTITUTION:A device is composed of a trimmer 4 which is inserted into a seam welded pipe 1 along its axis and on which a bite 5 for cutting beads 2 on the surface of the pipe 1 is provided, rollers 7 which are mounted on the trimmer 4 and made in contact rotatably with the internal surface of the pipe 1, a pair of upper and lower rotating bites 9 and 9' provided on the trimmer 4, and belts 10 applied between the rollers 7 and rotating bites 9 and 9', respectively. The rotating bites 9 and 9' are driven by rotational movement of the rollers 7 transmitted by the belts 10, and continued bead cut by the bite 5 is cut off in short pieces and removed by the rotating bites 9 and 9'.

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