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1. 发明专利

JPH0264195A SEAMLESS STEEL PIPE-PRODUCING LUBRICANT CONTAINING GILSONITE FINE POWDER 失效
公开(公告)号：JPH0264195A
公开(公告)日：1990-03-05
申请号：JP21362288
申请日：1988-08-30
申请人： NIPPON KOKAN KK , YUSHIRO CHEM IND
发明人： TANAKA MEGUMI , SAKURA HIROMOCHI , ODA TATSUHARU , HIRAKAWA TOMOYUKI , SOTANI YASUHIRO , KAJIYAMA FUYUHIKO , KANDA NOBORU , HOSONO HIROO , WAKABAYASHI TOSHITAKA , HASEGAWA JUN
IPC分类号： C10M173/00 , C10N10/02 , C10N20/00 , C10N20/06 , C10N30/06 , C10N30/08 , C10N40/24 , C10N50/02
摘要： PURPOSE:To obtain the title lubricant capable of providing water resistance, impact resistance and good lubricating properties by adding a salt of polybasic high-molecular weight acid to a composition consisting of a graphite fine powder, gilsonite fine powder and fine-particle synthetic resin insoluble in water and dispersing the blend into water. CONSTITUTION:The aimed lubricant obtained by adding one or more kind of salts of polybasic high-molecular weight acid selected from (D) humic acid, nitrohumic acid and ligninsulfonic acid to a composition consisting essentially of fine-particle synthetic resin insoluble in water consisting of (A) graphite fine powder, preferably having

2. 发明专利

JPH0264196A LUBRICANT FOR PRODUCING SEAMLESS STEEL PIPE 失效
公开(公告)号：JPH0264196A
公开(公告)日：1990-03-05
申请号：JP21362388
申请日：1988-08-30
申请人： NIPPON KOKAN KK , YUSHIRO CHEM IND
发明人： TANAKA MEGUMI , SAKURA HIROMOCHI , ODA TATSUHARU , HIRAKAWA TOMOYUKI , SOTANI YASUHIRO , KAJIYAMA FUYUHIKO , KANDA NOBORU , HOSONO HIROO , WAKABAYASHI TOSHITAKA , HASEGAWA JUN
IPC分类号： C10M173/00 , C10N10/02 , C10N20/00 , C10N20/06 , C10N30/06 , C10N30/08 , C10N40/24 , C10N50/02
摘要： PURPOSE:To obtain the title lubricant capable of providing water resistance, impact resistance and good lubricating properties by adding a salt of polybasic polymeric acid to a composition consisting essential of graphite fine powder and water insoluble fine-particle synthetic resin and then dispersing the blend into water. CONSTITUTION:The aimed lubricant obtained by adding (C) one or more kind of salts of polybasic polymeric acid selected from fumic acid, nitrofumic acid and ligninsulfonic acid to a composition consisting essential of (A) graphite fine powder, preferably having

3. 发明专利

JPH07251204A CONTROLLER FOR MANDREL MILL 失效
公开(公告)号：JPH07251204A
公开(公告)日：1995-10-03
申请号：JP4607194
申请日：1994-03-16
申请人： NIPPON KOKAN KK
发明人： SAWADA HIROSHI , KIMURA RYOSUKE , KOBAYASHI NOBUO , KAJIYAMA FUYUHIKO , OKAMOTO HIDEYOSHI
IPC分类号： B21B17/02 , B21B37/18 , B21B37/78
摘要： PURPOSE:To unnecessitate mesurement for characterizing a bar at the time of the next rolling and to enable the prevention of initial defective quality by making the trend control of the quality of a mandrel bar possible and also executing the tracking control of all information of the mandrel bar which is housed in a bar storehouse. CONSTITUTION:This controller is provided with an arithmetic processor 3 for estimating the intrinsic properties of the mandrel bar used at the time of manufacturing based on the dimension and quality informations of a product after rolling, bar tracking controller 4 with which the intrinsic properties of the mandrel bar that is estimated about each mandrel bar 1 which is in rolling or held in the storehouse after use with the arithmetic processor 3 are stored and controlled and the intrinsic properties of the mandrel bar is outputted at the time of reusing the mandrel bar 1 held in the storehouse, rolling controller 6 for initializing the number of revolution of roll and interval of a mandrel mill 5 based on the intrinsic properties of mandrel bar that is outputted with the bar tracking controller 4.

4. 发明专利

JPH0699205A METHOD FOR APPLYING ROLLING LUBRICANT ON SURFACE OF BAR IN MANDREL MILL 失效
公开(公告)号：JPH0699205A
公开(公告)日：1994-04-12
申请号：JP24841992
申请日：1992-09-18
申请人： NIPPON KOKAN KK
发明人： OKAMOTO YOSHIHIDE , YASUOKA HIDENORI , SUZUKI TOSHIO , KAJIYAMA FUYUHIKO , KOBAYASHI NOBUO
IPC分类号： B21B25/04
摘要： PURPOSE:To reduce the generation rate of inside surface flaw and to improve yield by applying rolling lubricant to a mandrel bar after preheating the mandrel bar in the proper temp. range. CONSTITUTION:The cold mandrel bar is preheated with an induction heating device 1. The temps. before and after heating are measured with a raddiation thermometer 2 and the mandrel bar is controlled so that its temp. is uniform over its entire length. The mandrel bar which is preheated in the proper temp. range (150 to 200 deg.C) is applied with a graphite-based rolling lubricant in a lubricant spraying chamber 3 and dried in a hot-air drying zone 4. After that, the bar is waited in an waiting zone 5 until it is coincided with a rolling schedule. In this way, the lubricant is strongly adhered, the generation rate of the inside surface flaw of the rolled seamless tube is greatly decreased and the depth of flaw is reduced and these contribute to the improvement of yield.

5. 发明专利

JPH06513A PIERCING METHOD FOR PREVENTING INSIDE SURFACE FLAW OF SEAMLESS TUBE 失效
公开(公告)号：JPH06513A
公开(公告)日：1994-01-11
申请号：JP15495192
申请日：1992-06-15
申请人： NIPPON KOKAN KK
发明人： KOBAYASHI NOBUO , YASUOKA HIDENORI , KAJIYAMA FUYUHIKO , SUZUKI TOSHIO
IPC分类号： B21B19/04
摘要： PURPOSE:To prevent inside surface flaw by rolling after increasing the facial angle at the inlet of roll within the range of biting limit that is determined from a draft at the tip of plug at the same time of biting. CONSTITUTION:A hollow tube stock la is formed while a base stock 11 is rolled and pierced by Mannesmann effect between a plug 4 and inclined rolls 2. At this time of piercing, inside surface flow is sometimes generated and the cause of the generation of inside surface flow like this is a fact that the facial angle alphaat the inlet of the roll is fixed during rolling by persisting the biting property of the base stock excessively important. When the base stock is once bitten, it is pierced by Mannesmann effect. So, it is unnecessary to always fix the facial angle at the inlet of roll. The base stock is rolled after increasing the facial angle at the inlet of the roll within the range of the biting limit that is determined from the draft at the tip of plug at the same time of biting the base stock. In this way, the generation of inside surface flaw can be reduced.

6. 发明专利

JPH03169409A WALL THICKNESS CONTROL METHOD OF REDUCING MILL 失效
公开(公告)号：JPH03169409A
公开(公告)日：1991-07-23
申请号：JP30865689
申请日：1989-11-28
申请人： NIPPON KOKAN KK
发明人： ODA TATSUHARU , IKUI KENJI , KAJIYAMA FUYUHIKO
IPC分类号： B21B17/14 , B21B37/18 , B21B37/78
摘要： PURPOSE:To form a shell as a prescribed target by comparing a measured wall thickness with a set value of the wall thickness of tube that is preliminarily stored, operating the difference of the both and changing the stretch factor of reducing mill. CONSTITUTION:The prescribed wall thickness is preliminarily set in a computer 5 and a wall thickness that is measured with a thickness measuring apparatus 2 is compared with the standard taper quantity. First, whether the measured taper quantity is smaller than the standard taper quantity is compared. And, in the case this is smaller, signals are sent to the reducing mill 4 and the stretch factor is increased. While, in the case the measured taper quantity of shell isn't smaller than the standard taper quantity, either this is larger than or the measured taper quantity of shell is equal to the standard taper quantity is decided. In the case the measured taper quantity is larger than the standard taper quantity, signals are sent to the reducing mill 4 and the stretch factor is decreased. And, in the case the measured taper quantity of shell and the standard taper quantity are equal, the stretch factor is taken as no change.

7. 发明专利

JPH0332409A EQUIPMENT FOR MANUFACTURING SEAMLESS STEEL TUBE 失效
公开(公告)号：JPH0332409A
公开(公告)日：1991-02-13
申请号：JP16636389
申请日：1989-06-28
申请人： NIPPON KOKAN KK
发明人： ODA TATSUHARU , AKITA SHINJI , KAJIYAMA FUYUHIKO , YAMAZAKI KAZUO , TODO KUNIO
IPC分类号： B21B17/02 , B21B17/04 , B21B23/00
摘要： PURPOSE:To obtain tube material having prescribed outer diameters and different in level from hollow stocks equal in outer diameter through a simple structure by providing a mandrel mill and a shell sizer which can assemble plural rolls right before the inlet side of the mandrel mill. CONSTITUTION:The mandrel mill and the shell sizer 22 in which three rolls are assembled right before the inlet side of the mandrel mill are provided. The shell sizer 22 is arranged right before the inlet side of the mandrel mill and positioned on the same line that the mandrel mill is. Accordingly, an intermediate tube stock into which a mandrel mill bar is inserted is reduced by the shell sizer 22 to a prescribed outer diameter. The shell sizer 22 drives all rolls 23a, 23b, 23c by one motor 24 through a bevel gear stored in a gear box 25. In this way, tube material having prescribed outer diameters and different in level is obtained from hollow tube stocks equal in outer diameter.

8. 发明专利

JPH05123729A TUBE END WALL THICKNESS CONTROL METHOD IN STRETCH REDUCER 失效
公开(公告)号：JPH05123729A
公开(公告)日：1993-05-21
申请号：JP28585191
申请日：1991-10-31
申请人： NIPPON KOKAN KK
发明人： HATANAKA MASAYUKI , KAJIYAMA FUYUHIKO , IKUI KENJI , SAWADA HIROSHI
IPC分类号： B21B17/14 , B21B37/18 , B21B37/78
摘要： PURPOSE:To determine the number of rolling stands for controlling the speed of revolution with respect to a thick wall thickness part of both tube end parts. CONSTITUTION:Estimated increased wall thickness part length and a cross section at the time when the tube end reaches each stand are calculated. Based on these values, the estimated increased wall thickness part length after final rolling is multiplied by an increased wall thickness part cross section, and the result is divided by an estimated increased wall thickness part cross section at the stand which each tube end reaches. As a result, increased wall thickness part estimated length at the time when the tube end reaches each stand can be estimated. By dividing the increased wall thickness part estimated length at the time when the tube end reaches each stand thereof by a stand interval, the number of stands for executing rolling control of an increased wall thickness part at the time when the tube end reaches each stand can be determined. Rolling accuracy is improved by applying this invention, crop length can be shortened by 20% maximum, the yield is improved by about 0.5.%, and also, wall thickness deviation of a steel tube can also be improved.

9. 发明专利

JPH04339504A METHOD FOR CONTROLLING WALL THICKNESS OF SEAMLESS TUBE 失效
公开(公告)号：JPH04339504A
公开(公告)日：1992-11-26
申请号：JP10938191
申请日：1991-05-14
申请人： NIPPON KOKAN KK
发明人： FUSHIMI NAOYA , SAWADA HIROSHI , KAJIYAMA FUYUHIKO , IKUI KENJI
IPC分类号： B21B17/14 , B21B37/18 , B21B37/78
摘要： PURPOSE:To prevent the generation of thickening at the front and rear ends of rolled stock by controlling the number of revolutions of plural rolls in the vicinity of through roll stand when the front and rear ends of rolled stock are passed through each roll stand. CONSTITUTION:With a speed meter 4 which is provided on the outlet side of each roll stand 2 of which a stretch reducer 1 is composed, the passing speed in the normal state of the rolled stock on the outlet side of each roll stand and passing speed of rolled stock on the outlet side of all roll stand at the point of time when the front or rear end of rolled stock passes through each roll stand are measured. Based on these measured passing speed in the normal state of rolled stock on the outlet side of each roll stand and passing speed at the point of time when the front and rear ends of rolled stock are passed, the number of revolutions of the plural rolls in the vicinity of through roll stand when the front and rear ends are passed through each roll stand is controlled and the generation of the thickening at the front and rear ends of rolled stock is prevented. In this way, thickness control at the front and rear end of seamless tube is accurately executed and thickened part can be reduced.

10. 发明专利

JPH04294924A CUTTING LENGTH CONTROL DEVICE FOR STEEL PIPE 失效
公开(公告)号：JPH04294924A
公开(公告)日：1992-10-19
申请号：JP5652991
申请日：1991-03-20
申请人： NIPPON KOKAN KK
发明人： OTA ATSUSHI , FUSHIMI NAOYA , KAJIYAMA FUYUHIKO
IPC分类号： B21C1/24 , B23D36/00 , B26D1/14 , G05D5/00
摘要： PURPOSE:To cut off a normal part as long as possible within the limits of target product length by measuring changes in passing length and wall thickness of a passing long size elementary pipe according to the passage of time, and carrying out operation on cutting length per a single product by subtracting total length of increased wall thickness parts and length obtained by multiplying a cutting unit by the number of cutting products from the overall length of the long size elementary pipe. CONSTITUTION:An increased wall thickness part length judging means 3 judges length of increased wall thickness parts on the tip/rear edges of a long size elementary pipe and the overall length from a length signal on the overall length of the long size elementary pipe from a length measuring apparatus 1 and a wall thickness signal from a wall thickness measuring apparatus 2. A product proper length judging means 5 judges whether or not cutting length per a single product obtained by carrying out operation by means of a cutting length operation means 4 is within range of target product length. A cutting length control means 6 removes gripped increased wall thickness parts when the cutting length per the single product obtained by means of operation is within range of the target product length, and carries out the cutting by its cutting length. Meanwhile, when the cutting length is not within range of the target product length, it cuts crops on the tip/rear edges by the set crop length, and issues a command so as to cut off a normal part by the set cutting length.

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