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1. 发明专利

JPH1177213A METHOD AND EQUIPMENT FOR PARTIALLY INCREASING WALL THICKNESS OF TUBULAR BODY 失效
公开(公告)号：JPH1177213A
公开(公告)日：1999-03-23
申请号：JP24160497
申请日：1997-09-08
申请人： NAKAJIMA KOKAN KK
发明人： NAKAJIMA HIROSHI , NAKAJIMA NORIO
IPC分类号： B21C37/16 , B21J1/06 , B21J5/08 , B21K21/16
摘要： PROBLEM TO BE SOLVED: To provide the partially wall-thickness increasing method capable of forming a constantly appropriate wall thickness increased part without minding the heating temperature. SOLUTION: A tubular body 1 is arranged with its tubular axis perpendicular, an intended part of the tubular body 1 is heated, and the compression force P in the tubular axial direction is given to the tubular body 1 to form a wall thickness increased part 2 at the intended part. Even when the heated part at high temperature can be deformed in a sagging condition by the self weight, the heated part is compressed in the sagging direction to form the constantly appropriate wall thickness increased part 2, and the temperature can be easily controlled without minding the heating temperature so much.

2. 发明专利

JP2852308B2 失效
公开(公告)号：JP2852308B2
公开(公告)日：1999-02-03
申请号：JP22856991
申请日：1991-08-15
申请人： NAKAJIMA KOKAN KK , NAKAJIMA NORIO , NAKAJIMA HIROSHI , NAKAJIMA NORIO , NAKAJIMA SHIN
发明人： NAKAJIMA NORIO , NAKAJIMA HIROSHI , NAKAJIMA NORIO , NAKAJIMA SHIN
IPC分类号： B21C37/15 , B21D5/12 , C21D8/10

3. 发明专利

JPH09279241A PRODUCTION OF SQUARE STEEL TUBE 失效
公开(公告)号：JPH09279241A
公开(公告)日：1997-10-28
申请号：JP9065096
申请日：1996-04-12
申请人： NAKAJIMA KOKAN KK
发明人： NAKAJIMA HIROSHI , NAKAJIMA NORIO
IPC分类号： B21C37/08 , B21C37/15 , C21D8/10 , C21D9/08 , C22C38/00 , C22C38/04
摘要： PROBLEM TO BE SOLVED: To improve the uniformity of mechanical property and the toughness by using a hot rolling steel of low Mn of a specific composition as the raw material, forming a raw tube with cold forming and welding, then hot-forming to a square tube at the time of producing a large square steel tube of square body or rectangular shape as a building material. SOLUTION: At the time of producing a square column like 350 to 400mm square × 12 to 22mm thickness, as a raw material is used of a steel plate of containing, by weight ratio, 0.12 to 0.18% C, 0.10 to 0.55% Si, 0.65 to 1.50% Mn,

4. 发明专利

JPH01293990A BEVELED STEEL PIPE WITH BACKING METAL AND ITS FORMING METHOD 失效
公开(公告)号：JPH01293990A
公开(公告)日：1989-11-27
申请号：JP12540088
申请日：1988-05-23
申请人： NAKAJIMA KOKAN KK
发明人： NAKAJIMA NORIO
IPC分类号： E04B1/58 , B21D19/08 , B23K9/00 , B23K31/00 , E04C3/04
摘要： PURPOSE:To obtain a good butt joint by forming the plate thickness of a column thicker to the inside near the end face, forming a backing metal with slightly leaving the part thereof in the longitudinal direction and making the steel plate end face in the bevel part of an inclination of an obtuse angle to the external part from the outside base part of the backing metal. CONSTITUTION:The beveled part 3 of a steel plate forming a column 1 is equipped with an angular face optimum for the one side butt welding of the steel plate in the plate thickness of a column material. A backing metal 4 is form with the root interval 6 optimum for forming a butt welding joint to seal the bottom part of a welding bevel. Beveled backing metal forming are executed mechanically by a hot stamping or roll forming, so integral with a main body on the material, with enough strength and good accuracy. In case of abutting the end face of the backing metal 4 to the diaphragm 2 plane no gap is formed nor any fear of the leakage of a molten metal. Due to right angles being formed on the end face and column shaft center no distortion is caused on the shaft center of the assembled column-beam connection. Consequently the manhour in assembling is reduced and the column-beam connection of high accuracy can be assembled.

5. 发明专利

JP2889886B2 失效
公开(公告)号：JP2889886B2
公开(公告)日：1999-05-10
申请号：JP14200592
申请日：1992-05-08
申请人： NAKAJIMA KOKAN KK , NAKAJIMA NORIO , NAKAJIMA HIROSHI , NAKAJIMA NORIO , NAKAJIMA SHIN
发明人： NAKAJIMA NORIO , NAKAJIMA HIROSHI , NAKAJIMA NORIO , NAKAJIMA SHIN
IPC分类号： B21C37/15 , C21D8/10

6. 发明专利

JPH09103821A MANUFACTURE OF SQUARE STEEL TUBE 失效
公开(公告)号：JPH09103821A
公开(公告)日：1997-04-22
申请号：JP28823295
申请日：1995-11-07
申请人： NAKAJIMA KOKAN KK
发明人： NAKAJIMA NORIO
IPC分类号： B21B17/14 , B21C37/15
摘要： PROBLEM TO BE SOLVED: To prevent such a case that the top end part or rear end part of a square steel tube, which is hot formed in a square tube forming machine, is not perfectly formed and taken out and deformed over considerable length in a producing method of making a round steel tube as the original tube. SOLUTION: By cold forming an original tube 4 in a square steel tube producing device 22, a multi-angle hollow steel tube 5 having a broader width dimension W1 than the width dimension W of a final article 6 is formed. The multi- angle hollow steel tube 5 is hot formed while drawing in a square steel tube forming machine 28 after heating it at a high temperature in a heating furnace 27, and the square steel tube 6 of a prescribed dimension, being enough formed from the top end part to the rear end part is produced.

7. 发明专利

JPH0999324A MANUFACTURE OF SQUARE TUBE 失效
公开(公告)号：JPH0999324A
公开(公告)日：1997-04-15
申请号：JP28823395
申请日：1995-11-07
申请人： NAKAJIMA KOKAN KK
发明人： NAKAJIMA NORIO
IPC分类号： B21B17/14 , B21C37/15 , B21D5/12
摘要： PROBLEM TO BE SOLVED: To produce a square tube having prescribed dimensions while being sufficiently form from a top end part to a rear end part by forming a plate stock into a polygonal hollow steel tube by a press forming machine, then heating and subjecting it to hot forming while being drawn by a square tube forming machine. SOLUTION: The plate stock (steel sheet) is formed by a press forming machine 12, subjected to tack welding by a tack welding machine 13, subjected to internal welding by an internal welding machine 14, then subject to external welding by an external welding machine 15 to form a polygonal hollow steel tube 8 having the width wider than that of a regular quadrilateral final product having a seam weld zone 7 and the large radius of curvature of a corner part. The polygonal hollow steel tube 8 is heated by a heating furnace 17, then the tube 8 is subjected to hot forming while drawing the width dimension and radius of curvature of the corner part by a square tube forming machines 18 and 20 to obtain the square tube 9.

8. 发明专利

JPH06262249A METHOD AND DEVICE FOR COOLING HOT FORMED MATERIAL 失效
公开(公告)号：JPH06262249A
公开(公告)日：1994-09-20
申请号：JP7863393
申请日：1993-03-15
申请人： NAKAJIMA KOKAN KK
发明人： NAKAJIMA NORIO
IPC分类号： B21B43/00 , B21C37/08 , B21C37/15 , C21D1/00 , C21D9/08
摘要： PURPOSE:To uniformly cool a hot formed large diameter square steel tube in circumferential and longitudinal directions to prevent generation of longitudinal deflection and strain based on heat stress distorsion of steel and to form a large diameter square steel tube having structure and mechanical property of steel which are uniform in all the directions. CONSTITUTION:While a hot formed steel tube 6 is supported on a soft extended first endless chain conveyer 1 and the steel tube is rotated on the first conveyer centering the longitudinal axial center by driving the chain, a frame 2 on which the first conveyer is supported is mounted on a second endless chain conveyer 9. While the steel tube 6 is rotated on the first conveyer centering longitudinal axial center, the steel tube is carried by the second conveyer orthogonally to the longitudinal direction. Thus, method and device for uniform cooling the large diameter square steel tube are obtained.

9. 发明专利

JPH05309412A 失效
公开(公告)号：JPH05309412A
公开(公告)日：1993-11-22
申请号：JP14200592
申请日：1992-05-08
申请人： NAKAJIMA KOKAN KK
发明人： NAKAJIMA NORIO , NAKAJIMA HIROSHI , NAKAJIMA SHIN
IPC分类号： B21C37/15 , C21D8/10
摘要： PURPOSE:To make the radius of curvature in the radius part at the corner of a large diameter square steel tube small and also to form the large diameter square steel tube without deterioration of material in this part, with good accuracy of flatness of the flat surfaces on four sides of the steel tube and high yield from a round steel tube by hot rolling. CONSTITUTION:Grooves of respective forming rolls constituting a hot forming roll stand are successively changed from a round shape to an outward convex pincushion shape and a square shape as standards, also the groove of the forming roll 19 is closely brought into tight contact with the whole of outer peripheral wall of the steel tube by always making the entire inner circumferential length of the groove approximately coincide with the outer circumferential length of the formed steel tube and, besides reduction per one stage of forming roll is taken as 5 to 7mm, the temp. of the formed steel tube in the vicinity of the final stage of the forming roll 19 is taken as approximately 600 deg.C.

10. 发明专利

JPH05195066A HEAT TREATMENT OF ROUND CORNER PART OF LARGE DIAMETER SQUARE STEEL PIPE 失效
公开(公告)号：JPH05195066A
公开(公告)日：1993-08-03
申请号：JP2746992
申请日：1992-01-20
申请人： NAKAJIMA KOKAN KK
发明人： NAKAJIMA NORIO , NAKAJIMA HIROSHI , NAKAJIMA SHIN
IPC分类号： B21D5/12 , C21D1/42 , C21D9/08
摘要： PURPOSE:To hardly generate the thermal expansion strain and heat treatment strain in a steel pipe by heating peripheral wall at the round corner part of the large diameter square steel pipe and successively executing a process passing through slow cooling zone in the longitudinal axial direction. CONSTITUTION:A steel plate is bent with a cold-working and an opening edge in the longitudinal axial direction is butt-welded and the cross section is made to the square to make the large diameter square steel pipe 1. In the condition of inclining the peripheral surface of this steel pipe 1 at almost 45 deg. angle to the horizontal plane, this steel pipe is inserted and carried in a heat treatment device 5 composed of a high-frequency heating coil 6 arranged corresponding to each round corner part of the steel pipe 1 to uniformly heat the peripheral wall of the round corner part of the steel pipe 1 to hoop-state. After this condition is kept, the process passing through the slow cooling zone 13 is successively executed in the longitudinal axial direction of the steel pipe. By this method, the heat treatment and the refining are executed to the round corner of the steel pipe 1. Further, the high quality large diameter square steel pipe can be manufactured.

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