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1. 发明专利

JPH0841617A CONTROL OF WEIGHT UNIT, METSUKE IN TRANSVERSE DIRECTION OF HOT DIP COATED STEEL SHEET 失效
公开(公告)号：JPH0841617A
公开(公告)日：1996-02-13
申请号：JP12267495
申请日：1995-05-22
申请人： NIPPON STEEL CORP
发明人： ISHIZAKI KAZUNARI , OTANI CHIAKI , SUENAGA MAKOTO , MIYAKOSHI HISAHIRO
IPC分类号： B21B39/00 , B21B39/14 , C23C2/20
摘要： PURPOSE:To make it possible to obtain a homogeneously plated steel by predicting a camber by using a specific relation and controlling the flatness of the steel sheet to high accuracy. CONSTITUTION:The steel sheet 15 is made to travel via a sink roll 5 and support rolls 6, 7 in a hot dip coating bath from hot bridle rolls 1 to 4 and the weight unit in the transverse direction of the plated steel sheet is controlled. Thereupon, theta is calculated between the respective rolls by using the relation. The wrapping angle THETAof the steel sheet 15 of the first roll is determined. The wrapping angle of the first roll and the C camber on the outlet side of the respective rolls are obtd. as functions by the equation using the sum of the moving amt. of the sink roll 5 and the moving amt. of the lower support roll 6 obtd. by the relation. Presetting is executed by a driving device 11 in accordance with the numerical value calculated in such a manner that the C camber of on the outlet side of the first roll attains 0, by which the flatness of the steel sheet 5 is controlled with the high accuracy and the variations in the METSUKE in the transverse direction of the steel sheet are minimized. As a result, the variations in the transverse direction of the steel sheet are made uniform.

2. 发明专利

JPH08325695A PRECISION CORRECTION METHOD FOR POSITION DETECTOR OF HOT DIPPED STEEL SHEET 失效
公开(公告)号：JPH08325695A
公开(公告)日：1996-12-10
申请号：JP12677595
申请日：1995-05-25
申请人： NIPPON STEEL CORP
发明人： ISHIZAKI KAZUNARI , OTANI CHIAKI , MIYAKOSHI NAGAHIRO , OGATA MITSUO
IPC分类号： G01N23/223 , C23C2/20
摘要： PURPOSE: To correct precision for position detector of steel sheet and to control dispersion of coating weight by utilizing function approximation on calculated distance between traveling steel sheet and gas wiping nozzle, calculated from plated coating weight in downstream of plating equipment, and distance between the steel sheet and gas wiping nozzle detected with position detector of steel sheet. CONSTITUTION: Estimated distance X between steel sheet 1 and gas wiping nozzle 5 is calculated by using an equation I (where, D is distance between steel sheet and gas wiping nozzle (m 50m), W is coating weight (kg/cm ), P is gas wiping pressure (kg/cm ), V is passing speed of sheet (m/min), K0 to K3 are constants for each kinds of steel) from detected coating weight of a measuring instrument for plated coating weight utilizing fluorescent X-ray intensity, and gas wiping pressure corresponding to the coating weight and passing speed of sheet. Estimated distance X and distance Y between steel sheet 1 and wiping nozzle 5 measured by the steel sheet position detector corresponding thereto are function-approximated like equation II. The equation II shows precision character of steel sheet position detector 6. Accordingly, since output value after correction of the steel sheet position detector 6 is calculated by equation IV, considering precision character, linearity if inverse function of equation II, equation III is used, the output value is corrected by correction arithmetic unit 99.

3. 发明专利

JPH08253850A CONTROL METHOD FOR MAKING PLATING COATING WEIGHT OF HOT DIP COATED STEEL SHEET UNIFORM 失效
公开(公告)号：JPH08253850A
公开(公告)日：1996-10-01
申请号：JP5578395
申请日：1995-03-15
申请人： NIPPON STEEL CORP
发明人： UENO TOSHIAKI , OTANI CHIAKI , SUENAGA MAKOTO , MIYAKOSHI TOSHIHIRO
IPC分类号： G01N23/223 , C23C2/20
摘要： PURPOSE: To control the flattening of a hot dip coated steel sheet with high accuracy and to control the simple C camber with high accuracy thereof. CONSTITUTION: The shape of the coated steel sheet 1 is determined by a shape calculating device 8 from the plating coating weights on the front and rear surfaces of the respective transverse directions measured by an instrument 7 for measuring the plating coating weight of scanning in the transverse direction of the sheet which measures the respective plating coating weights on the front and rear surfaces in the transverse direction of the steel sheet by detecting the intensity of the fluorescent X-rays received after irradiation of the steel sheet traveling past a gas wiping area from a hot dip coating bath with γ rays or X-rays in its transverse direction. This control method for making the plating coating weights of the hot dip coated steel sheet uniform comprises approximating the resulted steel sheet shape with a quartic function and determining the installation positions of auxiliary dies 5 arranged in plural pieces on the front and rear of at least either of above and below wiping nozzles 4 in the transverse direction of the steel sheet 1 and the pressure of auxiliary dies 5 by an arithmetic unit 8 using the maximal value and minimal value of the function. The auxiliary dies 5 are then moved by a driving device 11 to the resulted set positions and the pressure of the auxiliary dies 5 are controlled by a pressure controller 10.

4. 发明专利

JPH0978215A CONTROLLER FOR COATING WEIGHT OF PLATING OF HOT DIP COATED STEEL SHEET 失效
公开(公告)号：JPH0978215A
公开(公告)日：1997-03-25
申请号：JP23516795
申请日：1995-09-13
申请人： NIPPON STEEL CORP
发明人： KUNIKATA YASUO , OTANI CHIAKI , MIYAKOSHI HISAHIRO , MATSUKUMA EIJI
IPC分类号： C23C2/20
摘要： PROBLEM TO BE SOLVED: To make the coating weight of plating in the transverse direction of a stainless steel uniform by detecting the steel sheet shape from the reflected light of the lasers transmitted through a half mirror treated glass sheet and adjusting the positions of wiping nozzles at the time of controlling a coating weight by gas wiping. SOLUTION: A light transparent flat plate 9 for calibration having translucent front and rear surfaces is disposed transversely on the front surface of the steel sheet 1 traveling in a gas wiping area and is irradiated with the spot light beams from plural semiconductor lasers 10. Simultaneously, the reflected light of the spot light for irradiation from the front and rear surfaces of the light transparent flat plate 9 and the steel sheet 1 is subjected to image pickup by a CCD camera 11, by which position detection is executed. The shape of the steel sheet 1 is approximated with a linear function by a shape detector 6 in the transverse direction of the steel sheet on the basis of the reflected light from the front and rear surfaces of the light transparent plate 1 and the inclination component (warpage) of the shape is calculated. Further, the right and left manipulated variables of the wiping nozzles 4 on the front and rear of the steel sheet are determined by using calculated value. The positions of the wiping nozzles 4 are moved and adjusted by driving devices 8a, 8b for discretely advancing and retreating the right and left nozzles.

5. 发明专利

JPH08260122A METHOD FOR CONTROLLING COATING WEIGHT OF PLATING OF HOT-DIP COATED STEEL SHEET 失效
公开(公告)号：JPH08260122A
公开(公告)日：1996-10-08
申请号：JP5911795
申请日：1995-03-17
申请人： NIPPON STEEL CORP
发明人： SUENAGA MAKOTO , MIYAKOSHI TOSHIHIRO , OTANI CHIAKI
IPC分类号： G01N23/223 , C23C2/20
摘要： PURPOSE: To uniformly adjust the coating weight of plating in the transverse direction of the front and rear of a steel sheet subjecting to plating by irradiating this steel sheet with γrays, detecting the coating weight of plating in the transverse direction and controlling the manipulated variable of gas wiping nozzles according to the detected value. CONSTITUTION: The steel sheet 1 is circumferentially wound around a sink roll 2 in a hot-dip coating bath and is subjected to plating. While the steel sheet is straightened in shape by top and bottom support rolls 3, 4, the plating is adjusted to the prescribed coating weight by the gas wiping nozzles 5 disposed on the front and rear of the steel sheet. Instruments 6 for measuring the coating weight of plating by scanning in the transverse direction are disposed above the gas wiping nozzles 5 to measure the coating weights of plating in the respective positions of the front and rear surfaces in the transverse direction by irradiating the traveling steel sheet 1 subjected to coating in the transverse direction with γ rays or X rays. The distances from the front ends of the wiping nozzles to the steel sheet 1 are calculated in accordance with the measured values. The twisted-components of the coating weight in the transverse direction are calculated from the values of the distances, by which the right and left manipulated variables of the wiping nozzles 5 on the front and rear are determined. As a result, the coating weights of plating on the front and rear in the transverse direction of the steel sheet 1 are made uniform.

6. 发明专利

JPH06192806A METHOD FOR CONTROLLING SHAPE OF HOT-DIP PLATED STEEL SHEET 失效
公开(公告)号：JPH06192806A
公开(公告)日：1994-07-12
申请号：JP34491092
申请日：1992-12-24
申请人： NIPPON STEEL CORP
发明人： ISHIZAKI KAZUNARI , SUENAGA MAKOTO , OTANI CHIAKI
IPC分类号： C23C2/00 , C23C2/40
摘要： PURPOSE:To control the flattening degree of a hot-dip plated steel sheet with high accuracy by finding the moving amt. of a sink roll so as to form the shape of the steel sheet into a flat one by using the relational formulae of the camber of the steel sheet. CONSTITUTION:In a running plated steel sheet, from the relational formulae in which the camber DELTAC of the steel sheet is expressed by the relationship of the primary formulae of the moving amt. of the sink roll such as the formulae I and II, the size of the steel sheet and intermeshes IM between the upper and lower support rolls are substituted to decide the coefficients of each term in the primary formulae. The formula I is the case in which the sheet thickness (mm) (a) satisfies a

7. 发明专利

JPH09279323A METHOD FOR CONTROLLING COATING WEIGHT IN TRANSVERSE DIRECTION OF HOT DIP COATED STEEL SHEET AND APPARATUS THEREFOR 失效
公开(公告)号：JPH09279323A
公开(公告)日：1997-10-28
申请号：JP8818996
申请日：1996-04-10
申请人： NIPPON STEEL CORP
发明人： KUNIKATA YASUO , OTANI CHIAKI , MIYAKOSHI TOSHIHIRO
IPC分类号： C23C2/20 , C23C2/00
摘要： PROBLEM TO BE SOLVED: To minimize the coating variations in the transverse diorection of a steel sheet and to reduce waste time by minimizing the absolute quantity of the entire part of warpage even with a laterally asymmetrical steel sheet shape. SOLUTION: The shape of the steel sheet to be plated is detected by using a laser 18 just above a wiping nozzle. The warpage quantity is calculated from the detected value and a synchronizing roll 5 is moved horizontally in accordance with the relation between the horizontal moving quantity of the synchronizing roll 5 and the warpage quantity predetermined to minimize the warpage quantity, by which the variations in the coating in the transverse direction of the steel sheet are minimized.

8. 发明专利

JPH0987821A METHOD FOR CONTROLLING PLATING UNIT WEIGHT IN WIDTH-DIRECTION OF HOT-DIP COATED STEEL SHEET 失效
公开(公告)号：JPH0987821A
公开(公告)日：1997-03-31
申请号：JP25141795
申请日：1995-09-28
申请人： NIPPON STEEL CORP
发明人： OTANI CHIAKI , MIYAKOSHI HISAHIRO , KUNIKATA YASUO
IPC分类号： C23C2/20
摘要： PROBLEM TO BE SOLVED: To minimize the dispersion of plating unit weight in the width direction of a steel sheet by detecting the continuous shape of a steel sheet in the position of a gas wiping nozzle and moving a sink roll and a support roll so that the amount of warpage of the steel sheet can be minimized. SOLUTION: A traveling steel sheet is irradiated with a spotlight via a light transmitting flat plate attached to the steel sheet to subject the reflected rays from the surface and rear side surface of the light transmitting flat plate and the steel sheet to image picking-up to detect the position, and the amount of warpage of the steel sheet is computed on the basis of the reflected rays from the surface and rear side surface of the light transmitting flat plate. By using the relational equations, I to IV, of the amount of warpage C, (θ) is computed between respective rolls. The contact angle Θi of the steel sheet at the i-th roll is determined by the equation IV. The sum of respective moving quantities of a sink roll and a downward support roll is defined as P shift, and the amount of warpage C on the outlet side of respective rolls is computed by equation V and the amount of warpage C on the outlet side of the support roll is computed by equation VI, and P shift satisfying C=0 in the equation VI is computed. In the equations, Hi and Di are the center-to-center dimension and the roll lap quantity of the i-th roll and the (i+1)-th roll, respectively, di is the diameter of the i-th roll, and (a) is sheet thickness.

9. 发明专利

JPH06116696A DEVICE FOR CONTROLLING PLATING WEIGHT OF HOT-DIP PLATED STEEL SHEET 失效
公开(公告)号：JPH06116696A
公开(公告)日：1994-04-26
申请号：JP26727092
申请日：1992-10-06
申请人： NIPPON STEEL CORP
发明人： ISHIZAKI KAZUNARI , SUENAGA MAKOTO , OTANI CHIAKI
IPC分类号： C23C2/16 , G01N23/223
摘要： PURPOSE:To make the plating weight uniform in the cross direction of a steel sheet by continuously detecting the shape of even a twisted steel sheet and separately operating front and rear gas wiping nozzles. CONSTITUTION:The deviation DELTAD=(1nW1-1nW2)/K from the plating weights W1 and W2 on the front and rear of the steel sheet is calculated from the scanning device 5 for measuring the plating weights in the cross direction of a steel sheet 1 and a shape arithmetic device 6 to obtain the steel sheet shape. The shape thus obtained is approximated by a linear expression to calculate the shape inclination, a shape control arithmetic device 7 for detecting the left and right manipulated variables of front and rear gas wiping nozzles 4 and a device 8 for moving the nozzles 4 laterally and back and forth are further furnished, and the plating weight of the steel sheet is made uniform in the cross direction.

10. 发明专利

JPH08199323A CONTROL OF COATING WEIGHT OF HOT DIP METAL STEEL SHEET AND DEVICE THEREFOR 失效
公开(公告)号：JPH08199323A
公开(公告)日：1996-08-06
申请号：JP858795
申请日：1995-01-24
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： SUENAGA MAKOTO , OKADA NOBUYOSHI , OTANI CHIAKI , IIDA HIROSHI , MORII SHIGEKI , INOUE JUNJI
IPC分类号： G01N23/223 , C23C2/20
摘要： PURPOSE: To make the coating weight of a hot dip steel sheet uniform. CONSTITUTION: The steel sheet shape is determined from the respective measured coating weights on the front and rear surfaces in the transverse direction of the steel sheet obtd. from a coating weight meter of a scanning type in the transverse direction of the sheet. This steel sheet shape is approximated by a quartic function. The sets of electromagnets 5 and displacement gages 6 are installed at the maximal value and minimal value of the quartic function and both plate ends. The excitation currents of the electromagnets 5 are controlled so that the steel sheet shape is flat, and the excitation currents are controlled by the measured displacement of the displacement gages 6 as well, by which the steel sheet in the coating weight control positions is flattened. As a result, the coating weight is made uniform by this coating weight controller. The control of the flatness of the steel sheet with high accuracy is made possible and the coating weight is made uniform even with the steel sheet shape having >=2 pieces of the maximal values, for example, such intricate steel sheet shape like, for example, an M shape.

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