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1. 发明专利

JPH06108166A METHOD FOR CONTROLLING COOLING 失效
公开(公告)号：JPH06108166A
公开(公告)日：1994-04-19
申请号：JP25690992
申请日：1992-09-25
申请人： NIPPON KOKAN KK
发明人： TAMURA KAZUTAKA , HONDA AKIYOSHI , TAGUCHI NOBORU
IPC分类号： C21D9/573 , C21D11/00
摘要： PURPOSE:To restrain the strip temp. from exceeding the allowance range in a cooling zone and to improve the quality of a product by securing the stable cooling capacity operation while effectively utilizing a CC zone having a small cooling capacity in spite of various kind conditions of a material to be cooled. CONSTITUTION:In the cooling control method for cooling the material 2 to be cooled in the rapid cooling (GJC) zone using cooling gas blow 11 and the slow cooling (CC) zone using a cooling tube 12, when the cooling capacity of the material to be cooled passing through the slow cooling zone is lower than the max. furnace hearth load in the preset slow cooling zone, the strip temp. on the outlet side of the rapid cooling zone is controlled basing on the relation being almost proportional to the CC zone furnace hearth load. When the cooling capacity of the material to be cooled passing through the slow cooling zone according to the variation, etc., of various kind conditions of the material to be cooled exceeds the max. furnace hearth load, the strip temp. on the outlet side of the rapid cooling zone is obtd. basing on the preset max. furnace hearth load to control the strip temp. on the outlet side of the rapid cooling zone.

2. 发明专利

JPH0593251A METHOD FOR CONTROLLING ALLOYING FURNACE IN EQUIPMENT FOR MANUFACTURING GALVANNEALED STEEL SHEET 失效
公开(公告)号：JPH0593251A
公开(公告)日：1993-04-16
申请号：JP25183591
申请日：1991-09-30
申请人： NIPPON KOKAN KK
发明人： HONDA AKIYOSHI , IRIE KATSUHIRO
IPC分类号： C23C2/06 , C23C2/28 , C23C2/40
摘要： PURPOSE:To conquer the point at issue that, because sheet temp. on the inlet side of an alloying furnace changes, the temp. on the outlet side of the allaying furnace changes by the calculated quantity of inputted heat by the conventional method. CONSTITUTION:When a steel sheet 1 passes through a galvanizing bath 2 and passes through a gas throttle nozzle 4, the estimation of the temp. of the steel sheet 1 is executed. Next, by an alloying controller 7, the quantity of heat to be inputted into an alloying furnace is found based on coil information, line information and the estimated temp. on the inlet side of the steel sheet, and the quantity of heating in the steel sheet is controlled by an alloying furnace simple substance controller 8. By this invention, even if the operating conditions such as the line speed, the size of the steel sheet, the gas pressure of a gas throttle nozzle or the like are changed, the alloying heating temp. can be held to a fixed one, and a galvannealed steel sheet of stable quality can be manufactured.

3. 发明专利

JPH0578804A METHOD FOR CONTROLLING TEMPERATURE OF HOT DIP COATING BATH 失效
公开(公告)号：JPH0578804A
公开(公告)日：1993-03-30
申请号：JP23985091
申请日：1991-09-19
申请人： NIPPON KOKAN KK
发明人： TAMURA KAZUTAKA , HONDA AKIYOSHI , IWABUCHI MASAHIRO
IPC分类号： C23C2/00 , C23C2/06
摘要： PURPOSE:To control the temp. of a plating bath to a specified temp. by controlling the carryover heat quantity of the steel sheet advancing into the plating bath in order to control the operation of a plating bath induction heater to specified output in control of a galvanizing bath induction heating system of a hot dip coating line. CONSTITUTION:The galvanizing bath temp. from 3, the temp. of the steel sheet on the outlet side of a cooling zone from 6, the temp. of a snout furnace from 7, steel sheet information, and a steel sheet line speed are inputted to a process controller 2. A temp. is set at a galvanizing bath controller 4. The process controller 2 instructs an optimum control temp. to a steel sheet temp. indicating controller 5. The steel sheet temp. indicating controller 5 controls a cooler 8. The galvanizing bath controller 4 controls an induction heater 9. Very small granular flaws, etc., which are the defects of the plating bath characteristics are drastically decreased and an important contribution is made to the improvement in the quality of the steel sheet.

4. 发明专利

JPH0448967A CONTROLLING METHOD FOR DRYING DEGREE OF WATER-SOLUBLE COATING FILM ON STEEL PLATE 失效
公开(公告)号：JPH0448967A
公开(公告)日：1992-02-18
申请号：JP15744890
申请日：1990-06-18
申请人： NIPPON KOKAN KK
发明人： HONDA AKIYOSHI , TANABIKI HIROSHI , ONO NARIYUKI , KAKIMOTO HISAYOSHI
IPC分类号： B05D7/14 , B05D3/00 , B05D3/02 , B05D7/24
摘要： PURPOSE:To perfectly dry a coated film by detecting the moisture of the film immediately after drying by the moisture meter arranged in the vicinity of the outlet of a drying oven and feeding back the moisture value to control the temp. of the oven. CONSTITUTION:After a steel plate 1 is coated with a water-soluble film, the coated steel plate is passed through a drying oven 3 to be dried at predetermined oven temp. At this time, the moisture of the film immediately after drying is detected by the moisture meter 5 arranged in the vicinity of the outlet of the drying oven 3 and the moisture value is fed back to control the temp. of the drying oven. As a result, even when there is fluctuation in an operating condition, the water-soluble film can perfectly be dried in a proper drying degree and the control accuracy of oven temp. is enhanced.

5. 发明专利

JPH0716634A METHOD FOR CONTROLLING ELONGATION PERCENTAGE OF STEEL SHEET IN SKIN-PASS ROLLING MILL 失效
公开(公告)号：JPH0716634A
公开(公告)日：1995-01-20
申请号：JP16819993
申请日：1993-07-07
申请人： NIPPON KOKAN KK
发明人： IRIE KATSUHIRO , HONDA AKIYOSHI , FUJII TOSHINORI , TEZUKA KAZUO , TAGUCHI NOBORU
IPC分类号： B21B37/00 , B21B37/56
摘要： PURPOSE:To execute feed-back controlling with providing the stability and the responsiveness together that the controlling gain can be increased to make the stationary state more stable and the responsiveness can be improved with the above characteristics, etc. CONSTITUTION:An elongation percentage average value arithmetic device 14 is inputted with an elongation percentage actual value epsilonsfbk calculated in an elongation percentage arithmetic device 6, and calculates the average value epsilonafbk of elongation percentage actual value epsilonsfbk of past several times. The feed-back of the elongation is changed so that if the difference of the elongation actual values epsilonsfbk of the past several times and the elongation set value epsilonref is within + or -alpha% of the elongation percentage allowance, the average value epsilonafbk of the elongation percentage actual values is made to be used as the elongation feed-back epsilonfbk for using in the elongation arithmetic controlling device 7, and if the other case the elongation actual value epsilonsfbk is made to be used.

6. 发明专利

JPH0625756A METHOD FOR CONTROLLING STRIP TEMPERATURE IN CONTINUOUS ANNEALING LINE 失效
公开(公告)号：JPH0625756A
公开(公告)日：1994-02-01
申请号：JP20623692
申请日：1992-07-10
申请人： NIPPON KOKAN KK
发明人： TAMURA KAZUTAKA , HONDA AKIYOSHI , MATSUSHITA YASUSHI , TAGUCHI NOBORU
IPC分类号： C21D9/56 , C21D11/00
摘要： PURPOSE:To keep the strip temperature jump within the permissible range without reducing the productive efficiency by rapidly changing the line speed within the permissible value when the strip size changing part passes the direct fire furnace of the continuous annealing line. CONSTITUTION:A strip 2 where the head end of the succeeding coil is welded to the tail end of the preceding coil is carried into a direct fire furnace 1 and heated and then, passed into a soaking furnace or the like to apply the necessary thermal cycle. The strip size changing part such as the strip thickness and the strip width is detected, the jumping quantity of the strip temperature on the furnace outlet side is calculated by a strip temperature control device 7. When this quantity exceeds the lower or upper permissible value of the strip temperature, the jumping quantity of the strip temperature is re-calculated by making an assumption that the line speed is arbitrarily changed while the strip is passing through the direct fire furnace 1. If the strip temperature when the jump of the strip temperature is observed is within the strip temperature permissible value, the strip temperature controlling device 7 gives an order to a line drive control device 9 so that the rapid change may be made to the corrective line speed which can control the strip temperature jump when the size changing part comes in the vicinity on the outlet side of the direct fire furnace 1.

7. 发明专利

JPH0617218A AUTOMATIC CONTROLLER FOR HOT-DIPPING DEPOSITION 失效
公开(公告)号：JPH0617218A
公开(公告)日：1994-01-25
申请号：JP5852793
申请日：1993-03-18
申请人： NIPPON KOKAN KK
发明人： KUNISHIMA YUJI , IRIE KATSUHIRO , HONDA AKIYOSHI
IPC分类号： B05B12/00 , C23C2/16
摘要： PURPOSE:To automatically control the plating amts. of a molten metal on the front and rear surfaces of a steel strip by controlling the shifts of gas ejection nozzles for controlling the molten metal deposition and the pressure of gas by the deviation between the set value of the plating deposition and the actually measured value of the deposition at the time of plating the steel strip with the molten metal. CONSTITUTION:The amts. of the molten metal sticking to the front and rear surfaces of the steel strip 3 stuck with the molten metal on the surfaces by passing the inside of a bath cell 1 for hot dipping are adjusted by the injection of the gas from a pair of the nozzles 2 and thereafter, the deposited amts. of the plating metal are actually measured with a plating deposition meter 4. The measurement signals 41 obtd. in such a manner are inputted to a feed forward controller and a feedback controller 7. The measurement signals 41 of the molten metal deposition and the signal 81 from a plating deposition setter 8 are compared and a set signal 71 of a nozzle injection pressure is outputted in accordance with the deviation therebetween. The gas injection pressure from the nozzles 2 is regulated by a pressure regulator 9. The shift quantity of the nozzles is controlled with an angle controller 12 by the deviation between the ratio of the set plating deposition on the front and rear of the steel strip 3 and the ratio of the actual plating deposition and the actual value of the deposition on the front and rear of the steel strip.

8. 发明专利

JPH08269669A METHOD FOR CONTROLLING ALLOYING DEGREE OF GALVANIZED STEEL SHEET 失效
公开(公告)号：JPH08269669A
公开(公告)日：1996-10-15
申请号：JP7797995
申请日：1995-04-03
申请人： NIPPON KOKAN KK
发明人： YAMAUCHI KENJI , HONDA AKIYOSHI , TAGUCHI NOBORU
IPC分类号： C23C2/28 , F27D11/06 , F27D19/00 , H03M20060101
摘要： PURPOSE: To control the alloying degree in continuous galvanizing in an adequate range by controlling alloying electric power to the value determined by functions, of steel kind, sheet thickness, sheet width, line speed, deposit and alloying degree. CONSTITUTION: A continuously transported steel strip is subjected to galvanizing and after the steel strip is adjusted to the prescribed deposit of plating, the plating is alloyed in an induction heating and alloying furnace. At this time, the alloying electric power is controlled to the value obtd. by the conditions of the equation which is the relation among the steel kind, sheet thickness, sheet width, line speed, deposit and alloying degree. In the equation, a0 to a5 are the constants given by each of the steel kinds. Further, the alloying degree after alloying is measured online and is substd. into the equation which count back a model error. Calculation with high accuracy is executed by taking this model error as a correction factor into consideration at the time of setting the electric power. As a result, the electric power setting of the alloying furnace is automated and the optimum alloying state is obtd. from the coil top part and, therefore, the length parts of the alloying defect are drastically decreased and the yield is improved.

9. 发明专利

JPH02259009A METHOD FOR CONTROLLING AIR RATIO IN DIRECT FIRING TYPE HEATING FURNACE 失效
公开(公告)号：JPH02259009A
公开(公告)日：1990-10-19
申请号：JP7831789
申请日：1989-03-31
申请人： NIPPON KOKAN KK
发明人： TAKEKOSHI ATSUHISA , HONDA AKIYOSHI , IRIE KATSUHIRO , IKEGAMI KAZUNARI , OTSUKA YOSHIO
IPC分类号： C21D1/76 , C21D9/56
摘要： PURPOSE:To prevent surface oxide of a steel plate and to enable heating of the steel plate by controlling mixing ratio of fuel gas and air with air ratio obtd. from pre-mixed gas. CONSTITUTION:In the combustion system of a pre-mix burner 2 having the pre-mixing device in a direct firing type heating furnace 1, the pre-mixed gas 5 is sampled and burnt, and the reduction ratio A in the combustion waste gas is measured with the equation I, and by obtaining the air ratio from this, the mixing ratio of the fuel gas 5 and the air 7 is controlled with this air ratio. Therefore, as the air ratio at combustion zone in the direct firing furnace 1 can be controlled, the surface oxidation of the steel plate is prevented as less as possible and the steel plate is efficiently heated. By this method, the steel plate having excellent surface characteristic is efficiently produced, and the production cost is reduced.

10. 发明专利

JPH0192322A METHOD FOR CONTROLLING SHEET TEMPERATURE IN CONTINUOUS ANNEALING FURNACE 失效
公开(公告)号：JPH0192322A
公开(公告)日：1989-04-11
申请号：JP24733487
申请日：1987-09-30
申请人： NIPPON KOKAN KK
发明人： KAWAKAMI MASAAKI , HONDA AKIYOSHI
IPC分类号： C21D9/56 , C21D11/00
摘要： PURPOSE:To efficiently and stably control sheet temp. at the time of changing line speed by making the prescribed speed changing rate after accelerating speed and reducing speed of the metal sheet reaches the limit speed at the max. speed changing rate and on the other hand, controlling the temp. at outlet of a heating furnace to the fixed value. CONSTITUTION:At the time of changing the running speed of the metal sheet as a material to be annealed in a direct firing type continuous annealing furnace, the upper and lower limit speeds, which the temp. of the metal sheet at the outlet of the furnace comes to out of the prescribed temp. range, in the case of making the max. speed changing rate and the max. burner combustion load at the time of the accelerating speed, and in the case of making the negative and the max. absolute value of the speed changing rate and the min burner combustion load at the time of the reducing speed, are found respectively. Further, the limit speed changing rates under conditions, which the burner combustion loads are the max. and the min in the case of being more than the above upper limit speed at the time of accelerating speed and in the case of being less than the above lower limit speed at the time of reducing speed, are found, respectively. Next, the running speed of the metal sheet is accelerated or reduced at the above speed changing rate till the running speed reaches the above limit speed, respectively. In the case of being more than or less than the above limit speed changing rate, respectively. On the other hand, the temp. control of the outlet of the heating furnace is executed by the fixed value control independently to the running speed of the metal sheet. By this method, lowering of the line efficiency at the time of changing the speed is prevented.

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