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1. 发明专利

JPH0693344A METHOD FOR CONTROLLING HEAT TREATMENT TEMPERATURE OF STEEL PIPE IN HEAT TREATMENT FURNACE 失效
公开(公告)号：JPH0693344A
公开(公告)日：1994-04-05
申请号：JP27117192
申请日：1992-09-14
申请人： NIPPON KOKAN KK
发明人： OTA ATSUSHI , MUTO KENICHI , KIMURA RYOSUKE
IPC分类号： C21D11/00
摘要： PURPOSE:To stabilize furnace temp. control condition and to prevent a defective heat treatment by suitably executing a tempering control at the end part in the longitudinal direction of a steel pipe in a control zone at the end part in the width direction of the furnace, in a computer control method of the heat treatment furnace for tempering the steel pipe. CONSTITUTION:A parameter of length possession rate is obtd. from the ratio of the length of the steel pipe 2 possessed in each control zone 6-9 of the total length of each control zone 6-9 in the width direction of the heat treatment furnace 1. Temp. of the steel pipe 2 is obtd. from a value adding an overall radiating heat absorbing rate of the steel pipe obtd. from the outer diameter of the steel pipe 2 and mutual interval between the steel pipes 2. Successively, the aimed value in the extracting time of a tempering parameter and an estimated calculating value in the extracting time of a tempering parameter are decided from the obtd. pipe temp. and the staying time of the steel pipe 2 in the furnace. Then, according to the deviation between the aimed value of the extracting time and the estimated calculating value in the extracting time, the heat treatment temp. changing value is obtd. and based on a value adding the parameter of length possession rate to this changing value, the heat treatment temp. of the steel pipe 2 is controlled.

2. 发明专利

JPH04220117A METHOD FOR AUTOMATICALLY DISCRIMINATING ROUND STEEL BAR 失效
公开(公告)号：JPH04220117A
公开(公告)日：1992-08-11
申请号：JP3075991
申请日：1991-02-26
申请人： NIPPON KOKAN KK
发明人： FUSHIMI NAOYA , OTA ATSUSHI , HASHIZUME MOTOI
IPC分类号： B21B39/00 , B21C51/00
摘要： PURPOSE:To discriminate a bar code though it is stained or faded by detecting the bar code read starting position of a round steel bar, and then, reading the bar code with a reader wherein a CCD camera is used. CONSTITUTION:A bar code of plural digits is printed by a dot marking device 2 in parallel with an axial line in the lengthwise direction of the round steel bar 1 running along the line. The bar code read start position is detected as the round steel bar 1 is rotated around the axial line, then, the graduation of the bar code of each position is read by a reader wherein the CCD camera 10 is used to make out a code of plural digits and to discriminate the round steel bar 1.

3. 发明专利

JPH03151102A LEARNING CONTROL METHOD FOR STRETCH REDUCER 失效
公开(公告)号：JPH03151102A
公开(公告)日：1991-06-27
申请号：JP29003289
申请日：1989-11-09
申请人： NIPPON KOKAN KK
发明人： OTA ATSUSHI , FUSHIMI NAOYA , KAJIYAMA FUYUHIKO
IPC分类号： B21B17/14 , B21B37/00 , B21B37/18 , B21B37/48 , B21B37/78
摘要： PURPOSE:To restrain the thickness at both ends from increasing and to improve the yield by estimating and operating unstable tensions and learning-controlling the following controlled variable at tube ends rolled in accordance with a deviation from a target set tension. CONSTITUTION:Initial and final unstable tensions are estimated and operated by a tension arithmetic unit 12 in accordance with the driving current of a motor driving a stretch reducer and the number of rotation of a roll of the stretch reducer. The set value of the number of rotation of the stretch reducer is corrected in accordance with the deviation between the tension and the target tension by estimated operation. When a next tube is rolled, the number of rotation of the stretch reducer is controlled in accordance with the corrected set value. As a result, the tube end parts are rolled appropriately, the length of a crop end is reduced and the yield is improved.

4. 发明专利

JPH07149420A DETECTION OF TRACKING ABNORMALITY 失效
公开(公告)号：JPH07149420A
公开(公告)日：1995-06-13
申请号：JP29764893
申请日：1993-11-29
申请人： NIPPON KOKAN KK
发明人： OTA ATSUSHI
IPC分类号： G01J1/42 , B21B37/00 , B21C51/00 , B65G43/08
摘要： PURPOSE:To detect tracking abnormality with a tracking device which radiates an ultraviolet ray onto the surface of an object determined to be the first material to pick up the image of its surface, and processes the image to determine whether or not paint has been sprayed thereon. CONSTITUTION:According to a command of marking the first material from a material tracking device 1 which grasps the movement of a steel pipe 21, paint is jetted from a marking nozzle 22 to mark a small circular spot mark 3 on the surface of the steel pipe 21 near its rear end. An ultraviolet ray is radiated from the ultraviolet ray radiating lamp 5 of a marking reader 4 on the longitudinal surface of steel pipe 21 which is the first marked material. While the steel pipe 21 is being rotated, the outer peripheral surface of the steel pipe 21 is image-picked up with a CCD camera 6. An image signal obtained through the image pick-up operation is transferred to tracking abnormality discriminating device for image processing to determine whether or not paint has been applied onto the surface of the steel pipe 21. If any abnormality is found, an alarm 8 is issued to notify tracking abnormality. It is thus possible to accurately detect abnormality.

5. 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.

6. 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.

7. 发明专利

JPH04157010A DEFECTIVE MATERIAL DISTRIBUTING METHOD FOR STEEL TUBE 失效
公开(公告)号：JPH04157010A
公开(公告)日：1992-05-29
申请号：JP27567990
申请日：1990-10-15
申请人： NIPPON KOKAN KK
发明人： OTA ATSUSHI , FUSHIMI NAOYA , KAJIYAMA FUYUHIKO
IPC分类号： B65G47/46 , B07C5/36 , B21B38/00 , B21B39/00
摘要： PURPOSE:To smoothly execute the operation of a cradle by counting up the generation rate of every classification of failure at every prescribed period, and increasing the number of allocated drop-in devices of every classification in accordance with the generation rate, at the time of distributing automatically a defective material to plural drop-in device at every classification. CONSTITUTION:Results of a non-destructive inspection and a visual observation inspection in on-line of a steel tube are decided synthetically, and a defective material 12 is distributed automatically to plural drop-in devices through a transfer table 14 from on a line 13 at every classification of failure. The generation rate of every classification of failure is counted up at every prescribed period, and in accordance with the generation rate, the number of allocated drop-in devices of every classification is increased and decreased. In such a way, the operation of a cradle 15a (distributing device of every classification of a defect) can be executed smoothly. It is prevented that an unbalance is generated in the operation of the cradle and the line is stopped, and it takes time for classifying the defective material in off-line, as a conventional distributing method for the defective material in which the number of cradles is constant by the classification of the defective material.

8. 发明专利

JPH11285716A METHOD FOR CONTROLLING PHYSICAL DISTRIBUTION FOR MANUFACTURING LINE 失效
公开(公告)号：JPH11285716A
公开(公告)日：1999-10-19
申请号：JP2238999
申请日：1999-01-29
申请人： NIPPON KOKAN KK
发明人： OTA ATSUSHI
IPC分类号： B23Q41/02 , B21B37/00 , B65G1/137 , B65G61/00 , G05B15/02 , G05B19/418 , G06F19/00 , G06Q50/00 , G06Q50/04 , G06F17/60
摘要： PROBLEM TO BE SOLVED: To provide a control method of physical distribution for minimizing the generation of material shortage and overload in each treating equipment by moving materials from on a line to an off-line part or inversely. SOLUTION: In the control method of physical distribution for manufacturing line for controlling the physical distribution by executing the simulation of the physical distribution on the manufacturing line including a finishing process, in-process state in each process about a specified period in future is simulated and, from that result, whether the movement of the materials due to delay on the line is necessary or not is judged (S2). By judging the idle state of the line from the finishing process on the upstream side, in-process materials in the off-line part are filled up in idle time bands (S3-S5) and, by repeating (S7, S8) the simulation (S6) of the in-process state in each process about the specified period in future, the final result of the simulation is obtained and also, based on this result, the information of the movement of the material between the line and the off-line part is indicated (S9).

9. 发明专利

JPH08294754A METHOD FOR CONTROLLING AUTOMATIC START OF CONTINUOUS CASTING AND DEVICE THEREFOR 失效
公开(公告)号：JPH08294754A
公开(公告)日：1996-11-12
申请号：JP1519496
申请日：1996-01-31
申请人： NIPPON KOKAN KK
发明人： OTA ATSUSHI , MIYAHARA HIROAKI , MAEDA HIROSHI , OSUMI AKIRA
IPC分类号： B22D11/08 , B22D11/16 , B22D11/18
摘要： PURPOSE: To prevent the development of a defective cast slab caused by the entrapment of inclusion by continuously measuring molten steel surface just after pouring the molten steel into a mold and controlling a flow rate of the molten steel from the difference between the level rising speed calculated from the variation of the molten steel surface and a reference speed. CONSTITUTION: When the wt. of the molten steel detected with a tundish weigher 7 reaches a preset value by pouring molten steel from a ladle to a tundish 9, a stopper 8 is fully opened by driving a stepping cylinder 4 through a casting control unit 3 to pour the molten steel. The molten steel surface level is continuously measured with an electrode type molten steel surface meter 2 and the molten steel surface rising speed is calculated based on this variation, and this calculated molten steel surface rising speed actual value is inputted to the casting control unit 3 and compared with the pre-inputted optimum target molten steel surface rising speed which does not entrap the inclusion. An opening degree correcting value is outputted through the casting control unit 3 so that the difference between the both becomes zero to make the stopper 8 a prescribed opening degree. By this method, the cast slab without entraping the inclusion can be produced.

10. 发明专利

JPH07164035A METHOD FOR CONTROLLING PHYSICAL DISTRIBUTION IN PRODUCTION LINE 失效
公开(公告)号：JPH07164035A
公开(公告)日：1995-06-27
申请号：JP31687993
申请日：1993-12-16
申请人： NIPPON KOKAN KK
发明人： OTA ATSUSHI
IPC分类号： B65G43/08 , B21B39/00
摘要： PURPOSE:To prevent the interruption of rolling, caused by the congestion of a refining line. CONSTITUTION:A signal from a material tracking device 1, is sent to a residence density arithmetic unit 2. A residence density in the zones 3a, 3b or 3c of a material, is calculated from the number of materials existing on 3a, 3b or 3c line of each zone, divided into plural zones of a refining equipment, and the maximum number of materials possible to exist, which is previously set. A calculated residence density and the moving speed v of the material, measured by a speedometer 4 installed at the inlet of the zone, are sent to a physical distribution state judgment device 5, and the congestion state of the material in the zones 3a, 3b or 3c, is judged. A judged result is sent to a transfer controller 6 in the zone. The material in the zone, is sprung out on an OFF line by an OFF-line spring device 7, according to a congestion state, by an indicate from the transfer controller 6 in the zone, and the material existing on an OFF line, is allowed to return on a line by a line loading device 8.

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