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1. 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.

2. 发明专利

JPH03170614A COMBUSTION METHOD IN HEATING FURNACE 失效
公开(公告)号：JPH03170614A
公开(公告)日：1991-07-24
申请号：JP30715889
申请日：1989-11-27
申请人： NIPPON KOKAN KK
发明人： AKIYAMA SHUNICHI , TADA TAKESHI , KUROSAWA TOSHIYUKI , SHIBUTA TSUTOMU
IPC分类号： C21D1/52 , C21D9/08
摘要： PURPOSE:To restrain the development of scale to low at any part in a heating furnace by burning unburnt content at the outside of incomplete combustion atmosphere surrounding a material to be heated and reducing secondary air quantity for burning the unburnt content at a part widening interval of burners. CONSTITUTION:In the heating furnace 1 for executing heat treatment to butt- welded pipe skelp 5 conveyed with a skid 8, fuel is burnt with the burners in primary combustion parts 3 arranged on furnace walls 2 in both sides at

3. 发明专利

JPH06220599A PRODUCTION OF GALVANIZED STEEL PIPE 失效
公开(公告)号：JPH06220599A
公开(公告)日：1994-08-09
申请号：JP1191193
申请日：1993-01-27
申请人： NIPPON KOKAN KK
发明人： SHIBUTA TSUTOMU , SUGIMOTO YUJI , KUROSAWA TOSHIYUKI , SUGAMASA TETSUAKI , KAIDA KOICHI , OMORI KATSUMI
IPC分类号： C23C2/06 , C23C2/18 , C23C2/38
摘要： PURPOSE:To form a plating layer of a uniform thickness without oxidizing a Zn plating bath by gas wiping the inside and outside surfaces of a steel pipe drawn out of the Zn plating bath with an inert gas at the time of galvanizing the inside and outside surfaces of this steel pipe. CONSTITUTION:The air within the steel pipe 21 to be Zn plated on the inside and outside surfaces is replaced with the gaseous N1 which is the inert gas; thereafter, the steel pipe is immersed into the galvanizing bath 22 to stick molten Zn on the inside and outside surfaces of the steel pipe 21. The gaseous N2 1a is then blown to the outside surface of the steel pipe 21 by an injection nozzle 2 to wipe the surface with the gas and to uniformalize the deposition of the Zn at the time of pulling up the steel pipe 21 from the galvanizing bath 22 by means of a magnet roller 24 of a pulling up device 23. The steel pipe 21 is heated by an induction heater 4 in such a manner that heat input falls gradually from the front end toward the rear end right thereafter, by which the temp. of the plated steel pipe 21 is uniformalized over the entire length. The gaseous N2 1b is then blown to the inside surface of the steel pipe 21 by the injection nozzle 3 to form the uniform Zn plating layer on the inside surface. Since air is not used as the wiping gas, the loss by oxidation of the Zn does not arise.

4. 发明专利

JPH06122016A METHOD FOR CONTROL HEAT INPUT OF FORGE WELDED STEEL TUBE 失效
公开(公告)号：JPH06122016A
公开(公告)日：1994-05-06
申请号：JP30067592
申请日：1992-10-14
申请人： NIPPON KOKAN KK
发明人： OTA ATSUSHI , SHIBUTA TSUTOMU
IPC分类号： B21C37/06 , B23K20/00
摘要： PURPOSE:To enable the heat input control of a forge welded steel tube by which many products of stable quality are obtained by controlling the temp. of a tublar skelp just before forge welding as taking thermal transformation texture in forge welded part into consideration. CONSTITUTION:To obtain the stable forge welded part in thermal transformation texture, the flow rate (f) of air at a welding horn 5 just before a butt-welding roll 6 is adjusted and the edge width W which is raised at a temp. of not less than a specific temp. is used as a parameter for this adjustment. In the case that the objective edge width is W1, the flow rate fU-fL of air corresponding to W2-W3 is preliminarily set in a controller 10 as an allowable band. And, the peak temps. T of the right and left edges also are used as a parameter for adjusting the flow rate (f) of air to attain a good forge welding property. Then, the temp. distribution of the tublar skelp just before the butt-welding roll 6 is determined with a linear ray thermometer 8 and outputted to the controller 10 through a signal processor. The actual value is compared with the target value which is set in the controller 10 and the flow rate of air is changing contolled in accordance with the deviation.

5. 发明专利

JPH0598345A PRODUCTION OF HIGH DAMPING STEEL TUBE 失效
公开(公告)号：JPH0598345A
公开(公告)日：1993-04-20
申请号：JP25816791
申请日：1991-10-04
申请人： NIPPON KOKAN KK
发明人： KUROSAWA TOSHIYUKI , OTAKE TAKAYUKI , SHIBUTA TSUTOMU
IPC分类号： B21C37/30 , C21D7/13 , C21D8/10 , C22C38/00 , C22C38/06
摘要： PURPOSE:To produce a high damping steel tube excellent in surface characteristics. CONSTITUTION:At the time of producing a high damping steel tube composed of Fe-Si-Al ally, finish working is done at >=500 deg.C at

6. 发明专利

JPH0523709A MANUFACTURE OF TUBE STOCK WITH TREE SKIN 失效
公开(公告)号：JPH0523709A
公开(公告)日：1993-02-02
申请号：JP17696191
申请日：1991-07-17
申请人： NIPPON KOKAN KK
发明人： KUROSAWA TOSHIYUKI , OTAKE TAKAYUKI , SHIBUTA TSUTOMU
IPC分类号： B21B17/00 , C22C38/00 , C22C38/06
摘要： PURPOSE:To obtain a steel tube having a surface with excellent tree skin by stipulating a working condition of a tube stock of Fe-Si-Al. CONSTITUTION:The diameter of a tube stock made from Fe-Si-Al alloy is rolled at a draft of at least 40% and at least 500 deg.C. The temperature in rolling is stipulated because diameters of crystal grains, at =500 deg.C. The ruggedness are extended by further stretching in the stretching direction and the surface with excellent tree skin can be obtained.

7. 发明专利

JPH04123817A MANUFACTURE OF FORGE WELDED TUBE 失效
公开(公告)号：JPH04123817A
公开(公告)日：1992-04-23
申请号：JP23975490
申请日：1990-09-10
申请人： NIPPON KOKAN KK
发明人： SHIBUTA TSUTOMU , MITSUYOSHI KATSUHIKO , ITOJIMA KANJI , KUROSAWA TOSHIYUKI
IPC分类号： B21C37/06 , B23K20/00
摘要： PURPOSE:To manufacture the forge welded tube without temperature difference of both side end parts by blowing the oxidation heat increasing gas to every one end part to be forge welded from independent nozzles. CONSTITUTION:Front nozzles 1a, 1b arranged at the upper stream side of the steel strip X for the main purpose of heat increasing are separated independent by, and the temperature of both side end parts of steel strip can be adjusted separately by blowing air or oxygen gas by using each independent nozzle of each one side of left or right. The rear side nozzle 2 which is arranged at the down stream side for mainly ejecting and removing scale, incorporates the image fiber 3 in it, and the temperature is measured with this image fiber 3. Following to the result of temperature measurement, the flow rate of air or oxygen of the front nozzles 1a, 1b is adjusted. By this invention, the temperature difference generated when there is a difference in the sheet thickness of both side end parts of the steel strip can be eliminated and the defective forge- welding of the forge welded part can be reduced.

8. 发明专利

JPH03234379A PRODUCTION OF FORGE WELDED PIPE 失效
公开(公告)号：JPH03234379A
公开(公告)日：1991-10-18
申请号：JP2724190
申请日：1990-02-08
申请人： NIPPON KOKAN KK
发明人： KUROSAWA TOSHIYUKI , MITSUYOSHI KATSUHIKO , ITOJIMA KANJI , SHIBUTA TSUTOMU , AKIYAMA SHUNICHI
IPC分类号： B23K20/00
摘要： PURPOSE:To allow the perfect scale blow of a forge welded part and to maintain the high temp. necessary for forge welding by bringing the blowing positions of a gas for oxidation heating up and a gas for scale blowing in proximity to each other. CONSTITUTION:An image fiber 2 is mounted in a lower nozzle 1b and the heat sensitive part thereof is positioned near the blow out port of the nozzle to measure the temp. of the forge welded part. The result obtd. from this temp. measurement is fed back and the amt. of the air or gaseous O2 to be blown out of the upper nozzle 1a is regulated, by which the temp. of the forge welding part is maintained at a more adequate temp. Consequently, the generation of the defective materials arising from such causes as the temp. drop of the forge welded part, excessive temp. and scale remaining, is decreased.

9. 发明专利

JPH06158164A MANUFACTURE OF BUTT WELDED TUBE 失效
公开(公告)号：JPH06158164A
公开(公告)日：1994-06-07
申请号：JP31042992
申请日：1992-11-19
申请人： NIPPON KOKAN KK
发明人： KUROSAWA TOSHIYUKI , TOKUHARA KOHEI , SHIBUTA TSUTOMU
IPC分类号： B21C37/08 , C21D8/10 , C21D9/08
摘要： PURPOSE:To provide a manufacturing method of a butt welded tube where the bending of the tube can be effectively prevented by controlling the tube temperature when the carrying condition of the tube stock is changed outside the prescribed temperature range. CONSTITUTION:A butt welded tube stock 11' is obtained by butt welding a strip 11 by using a butt welding machine 14 or the like, and hot-cut by a hot saw 16. Then, a butt welded tube is manufactured by executing the finishing treatment using a cooling equipment 18 or the like. When the tube stock 11' is carried to the position to execute the finishing treatment after the tube stock 11' is cut, the tube temperature when the carrying condition of the tube stock 11' is changed is controlled to be outside the temperature range of the A3 transformation point of the material + or -25 deg.C by using thermometers 19, 20, an arithmetic unit 23, and a control unit 24. Temperature control of the tube treated is executed by cooling the tube stock 11'. This constitution allows the butt welded tube to be manufactured without increasing the power consumption due to the increase of the rolling load.

10. 发明专利

JPH0679327A METHOD FOR PREVENTING OXIDATION OF HIGH TEMPERATURE TUBE BODY ON CONVEYOR LINE 失效
公开(公告)号：JPH0679327A
公开(公告)日：1994-03-22
申请号：JP25593492
申请日：1992-08-31
申请人： NIPPON KOKAN KK
发明人： OZAWA TOSHINORI , AKIYAMA SHUNICHI , KUROSAWA TOSHIYUKI , SHIBUTA TSUTOMU
IPC分类号： B21B39/00 , B21C37/06 , B23K37/00
摘要： PURPOSE:To prevent air from intruding into a cover and to hold the inner part of a line cover in an oxidation preventing atmosphere by blowing oxidation preventing gas into the periphery of a tube body, in an uncontinuous opening part of the line cover. CONSTITUTION:The opening part 6 to pass a kicker 8 of the tube body springing out device is mounted on a conveyor line cover X for a high temperature tube body 1 and the air which intruds from a clearance (a) into the cover X cannot be prevented by only a trough type cover member. A gas blow-in hole 7 is mounted on the cover 3 facing a uncontinuous part of the line cover like this and nitrogen gas is blown to the tube body 1 to keep this periphery in a oxidation preventing atmosphere. In this way, the concentration of oxygen in the cover can be reduced to

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