JP2007260775A - Method of and device for rolling metal plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of and a device for rolling a metal plate by which the metal plate which is free from a camber or has a very slight camber is stably manufactured. <P>SOLUTION: These method and device use a rolling mill for the metal sheets which has at least work rolls and back up rolls and equipment therefor. The forces in the direction of rolling which act on the upper and lower roll chocks of the work rolls are measured, and the difference between the upper force and the lower force of the forces in the direction of rolling is calculated. Based on the difference, upper and lower asymmetric components of the rolling using the rolling mill are controlled. As the upper and lower asymmetric components, roll speed, the coefficient of friction between the rolling rolls and a material to be rolled, temperature difference between the upper and back surfaces of the material to be rolled, the incidence angle of the material to be rolled and positions in the horizontal direction of the upper and lower work roll chocks are cited. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling method and a rolling apparatus for a metal sheet, and more particularly, to a rolling method and a rolling apparatus for a metal sheet that can stably produce a metal sheet that has no warpage or is extremely warped.

The warp generated during the rolling of the plate material greatly affects the productivity of the product, such as a reduction in rolling efficiency and an increase in the finishing process. For example, in the refining process, it is necessary to correct the warp by a leveler, a press or the like, and in an extreme case, a defective part may have to be cut. Further, when a larger warp occurs, the rolling equipment may be damaged by the collision of the plates. In this case, the plate itself not only loses its product value, but also causes great damage such as production stoppage and repair of rolling equipment.
Regarding the mechanism of the occurrence of rolling warpage, it is generally said that the cause is an asymmetry factor in the vertical direction in the following rolling.
1) Difference in friction coefficient between work roll and rolled material Δμ
2) Vertical temperature difference of rolled material (upper and lower difference of deformation resistance) Δt
3) Difference in peripheral speed between upper and lower work rolls ΔV
4) Geometric conditions ・ Radial difference ΔR between the upper and lower work rolls
・ Plate incidence angle (difference between upper and lower pass lines) α
However, not all the effects of the vertical asymmetry factor on warping have been elucidated.

With respect to such a problem, Patent Document 1 discloses a technique for controlling warpage by imparting a temperature difference between the upper and lower sides of a plate against warpage that occurs constantly and continuously.
Further, Patent Document 2 discloses a technique for preventing warpage by performing high lubrication on a portion where warpage occurs, in contrast to warpage that occurs constantly and continuously.
Further, Patent Document 3 discloses a method for controlling a path in which a warp suddenly occurs in a rolling path. This is because, in multi-pass reverse rolling, the upper and lower surface differences between the deformation resistance and the friction coefficient of the rolled material, which cause warping, based on the rolling information (up and down rolling torque, etc.) during the previous pass rolling. And predicting the direction and amount of warpage of the rolling warp occurring after the next pass, and trying to control this by the difference in the peripheral speed of the upper and lower rolls or the pick-up amount.
On the other hand, a method and apparatus for controlling a camber by measuring a rolling direction force applied to a work roll chock during rolling is disclosed in Patent Document 4, etc., but Patent Document 4 does not describe warpage and warpage control. Absent.

JP 63-63510 A JP 58-192605 A Japanese Patent Laid-Open No. 7-164031 International Publication Number WO2004 / 082860A1

However, the methods described in Patent Document 1 and Patent Document 2 are based on the premise that the warpage of the previous pass continues in any of the methods. However, in actual rolling, the warping direction may be reversed between the previous pass and the pass depending on the conditions, and in the conventional method, the warping may be increased if controlled.
Further, in the method described in Patent Document 3, it is necessary to individually measure the rolling torque of the upper and lower rolls. However, particularly in thick plate rolling, the rolling torque shows a very large value, and a large-scale measuring device is used. It is necessary to install.
Accordingly, the present invention provides a rolling method and rolling apparatus for a metal plate material that can stably produce a metal plate material that does not warp or is extremely warped without measuring the rolling torque of the upper and lower rolls. It is for the purpose.

The present invention has been made to achieve the above object, and the gist thereof is as follows.
(1) A method for rolling a metal sheet using a rolling machine for a metal sheet having at least a work roll and a reinforcing roll, measuring a rolling direction force acting on the roll chock of both the upper and lower work rolls, and rolling A method for rolling a metal sheet, comprising: calculating a difference between an upper side and a lower side of a directional force and controlling a vertical asymmetric component of rolling using the rolling mill based on the difference.
(2) The controlled vertical asymmetric component of the rolling is
Up-down asymmetric component of roll speed of the rolling mill,
Up and down asymmetric components of the friction coefficient between the rolling roll and the material to be rolled,
Vertically asymmetric component of the temperature difference between the upper and lower surfaces of the material to be rolled,
A vertically asymmetric component of the incident angle of the material to be rolled, and
Vertical asymmetrical component of the horizontal position of the vertical work roll chock,
The method for rolling a metal sheet according to claim 1, wherein any one of the above or a combination of two or more thereof is used.
(3) The method for rolling a metal sheet according to claim 1 or 2, wherein the work roll is offset on the entry side or exit side in the rolling direction of the work roll chock with reference to the reinforcing roll.

(4) A rolling apparatus including at least a metal sheet rolling mill having a work roll and a reinforcing roll, wherein the work roll chock measures the rolling direction force acting on the upper and lower roll chocks of both the upper and lower work rolls. A load detection device provided on both the entry side and the exit side of the rolling direction,
An arithmetic device that calculates the difference between the upper side and the lower side of the rolling direction force acting on the work roll chock based on the measurement value by the load detection device,
A computing device that computes a vertical asymmetric component control amount of the rolling mill based on the computed value;
A rolling device for a metal sheet, comprising: a control device that controls the vertical asymmetric component control amount of the rolling mill based on a calculated value of the vertical asymmetric component control amount.
(5) The up-and-down asymmetric component control amount to be controlled is
Asymmetrical component control amount of the roll speed of the rolling mill,
Asymmetrical control amount of the friction coefficient between the rolling roll and the material to be rolled,
Asymmetrical component control amount of the temperature difference between the upper and lower surfaces of the material to be rolled,
Control amount of up / down asymmetric component of incident angle of material to be rolled, and
Asymmetrical component control amount for the vertical position of the vertical work roll chock,
Any of the above or a combination of two or more thereof, the metal sheet material rolling apparatus according to (4) above.

(6) The rolling of the metal sheet according to (4) or (5) above, wherein the work roll chock has a device for pressing the work roll chock in the rolling direction on either the entry side or the exit side of the roll direction. apparatus.

(7) The apparatus for pressing a work roll chock in the rolling direction is a hydraulic device, and the rolling device for a metal sheet according to (6) above.

(8) A hydraulic device that presses the work roll chock in the rolling direction is provided on the opposite side of the work roll chock in the rolling direction on the entry side and the exit side to the side on which the work roll is offset based on the reinforcing roll. The rolling device for a metal sheet according to (6).

(9) As described in (4) or (5) above, the work roll is offset with respect to the reinforcing roll, and the load detecting device for measuring the force in the rolling direction is provided only for the offset. Metal plate rolling equipment.

In the rolling method and rolling apparatus of the metal plate material of the present invention, the force in the rolling direction acting on the roll chock of both the upper and lower work rolls is measured, and the difference between the upper rolling direction force and the lower rolling direction force, that is, the rolling direction By calculating the vertical difference of the force and operating the rolling mill vertical asymmetric component in the direction to reduce the vertical difference of the rolling direction force, without measuring the rolling torque of the upper and lower rolls, there is no warping or extremely A metal plate material with a slight warpage can be stably produced.
As the vertical asymmetric component, the roll speed of the rolling mill, the friction coefficient between the rolling roll and the material to be rolled, the temperature difference between the upper and lower surfaces of the material to be rolled, the incident angle of the material to be rolled, and the horizontal position of the vertical work roll chock Any one or a combination thereof may be used, and in any case, a light metal plate material having no warpage or extremely warpage can be stably produced without measuring the rolling torque of the upper and lower rolls.

The operation and effect of the present invention will be described below.
In general, the causes of warpage due to rolling are as follows: 1) Vertical difference Δμ in friction coefficient between work roll and rolled material, 2) Vertical temperature difference of rolled material (upper / lower difference in deformation resistance) Δt, 3) Upper and lower work roll circumference Difference in speed ΔV, 4) Geometric conditions and the like, but in any case, the advance rate and the reverse rate are finally generated by causing a vertical difference in the elongation strain in the rolling direction caused by rolling. It changes in the sheet thickness direction, causing a vertical difference in the exit side speed and the entrance side speed of the rolled material, and warping occurs. At this time, for example, when rolling the tip of the rolled material that is likely to be warped, the length of the rolled material on the exit side that has already been rolled is short, so it is relatively free to cause a vertical difference in the exit speed. In order to cause a vertical difference in the entry side speed, it is necessary to rigidly rotate the entire rolled material existing on the entry side in the vertical direction. However, since a long unrolled material generally remains on the entry side during the tip rolling, a moment against the rigid body rotation is generated due to the restraint between the weight of the rolled material itself and the table roller. Since this moment is transmitted as a reaction force to the work roll of the rolling mill, it is finally supported by causing a vertical difference in the rolling direction force acting on the work roll chock part.

According to the rolling method of the metal sheet material of the present invention described in (1), the force in the rolling direction acting on the roll chock of both the upper and lower work rolls is measured, and the upper rolling direction force and the lower rolling direction force Since the difference, that is, the difference in the rolling direction force, is calculated, the moment acting mainly from the entry side rolling material during the above-described tip end rolling can be detected from this value. This moment is generated only when an upper and lower difference in elongation strain that causes warpage occurs as described above, and the moment is also generated almost simultaneously with the occurrence of an elongation strain difference. It is possible to prevent the occurrence of warpage by manipulating the vertical asymmetric component of the rolling mill in the direction of reducing the difference.
Moreover, according to the rolling method of the metal plate material of the present invention described in (2), the vertical asymmetric component includes a rolling speed of a rolling mill, a friction coefficient between the rolling roll and the material to be rolled, and upper and lower surface temperatures of the material to be rolled. Any one of the difference, the incident angle of the material to be rolled, and the horizontal position of the upper and lower work roll chock may be combined, and in either case, the rolling torque of the upper and lower rolls is not measured and there is no warpage Alternatively, it is possible to stably manufacture a metal plate material that is extremely warped.
Furthermore, according to the rolling method of the metal sheet material of the present invention described in (3), the work roll offset is offset by the work roll offset by offsetting the work roll on the entry side or the exit side of the work roll chock in the rolling direction. Since the force is generated as a horizontal component of the rolling load, the position of the work roll chock in the rolling direction can be stabilized.
As described above, in the method of the present invention according to any one of the above (1) to (3), the vertical difference in elongation strain due to rolling, which directly causes warpage, is detected and measured, and this is immediately uniformed. Since the speed control of the upper and lower rolls for achieving the above is performed, it is possible to realize a slight rolling with substantially no warpage or extremely warpage.

Next, the present invention relating to a rolling apparatus for carrying out the method for rolling a metal sheet according to the present invention described in (1) to (3) will be described.
In the rolling apparatus for the metal sheet material of the present invention described in (4), since load detecting devices are provided on both the entry side and the exit side in the rolling direction of the roll chock of both the upper and lower rolls, the load on both the entry and exit sides By calculating the resultant force in consideration of the directionality of the measured value, the rolling direction force acting on the upper and lower roll chocks can be obtained regardless of the force acting in either the entry or exit direction. In addition, since an arithmetic unit that calculates the difference between the upper and lower rolling direction forces acting on the work roll chock is provided, the upper and lower sides of the rolling material are caused by the vertical difference in elongation strain in the rolling direction that causes warping. It is possible to detect the moment acting on the pair of work rolls. Furthermore, based on the vertical difference of the rolling direction force acting on the work roll chock, an arithmetic device for calculating the vertical asymmetric component control amount of the rolling mill for equalizing the elongation strain vertically, and the calculation of the vertical asymmetric component control amount Since the control apparatus which controls the said up-down asymmetrical component control amount of this rolling mill based on the value is provided, the up-down difference of the elongation strain which is the rolling method of the metal plate material as described in said (1)-(3) It is possible to perform rolling of a metal plate material that is prevented from warping and has no warpage or is extremely warped.
In addition, as the amount of control of the vertical asymmetric component, the roll speed of the rolling mill, the friction coefficient between the rolling roll and the material to be rolled, the temperature difference between the upper and lower surfaces of the material to be rolled, the incident angle of the material to be rolled, Any one of the horizontal positions may be combined, and in any case, a light metal plate material with no warpage or extremely warpage is stably produced without measuring the rolling torque of the upper and lower rolls. be able to.

In the rolling apparatus for a metal sheet material according to the present invention described in (6) above, an apparatus for pressing the work roll chock in the rolling direction is provided on either the entry side or the exit side of the work roll chock in the rolling direction. When rolling in a state where the work roll chock is pressed in the rolling direction in such an apparatus configuration, when the moment acts on the work roll from the rolled material due to the difference in the upper and lower elongation strain as described above, the rolling that immediately acts on the work roll chock Since it can be detected as a vertical difference in directional force, it is possible to provide a warpage control system with further excellent responsiveness and accuracy.
In the rolling apparatus for metal sheet material of the present invention described in (7) above, the apparatus for pressing the work roll chock in the rolling direction is a hydraulic apparatus. By pressing the work roll chock with a hydraulic device, the holding force can be controlled to be low enough not to disturb the rolling operation, and high enough to reduce vibration in the rolling direction of the work roll chock and stabilize the chock position. It becomes.

  Furthermore, in the rolling apparatus of the metal plate material of the present invention described in (8) above, the side opposite to the side where the work roll is offset with respect to the reinforcing roll, of the work roll chock in the rolling direction on the entry side and the exit side, A hydraulic device for pressing the work roll chock in the rolling direction is provided. By adopting such an arrangement, the offset component force generated as the horizontal component force of the rolling load due to the work roll offset acts in the same direction as the pressing force applied by the hydraulic device, so the position of the work roll chock in the rolling direction The pressing force to be applied from the hydraulic device to stabilize the pressure is reduced, so that the hydraulic device can be downsized and optionally omitted. If the rolling direction pressing force on the work roll chock becomes excessive, there may be a problem in the followability to the rolling position control during rolling as given by the sheet thickness control function, etc., but the pressing force applied from the hydraulic device is kept small. Therefore, the occurrence of such a problem can be avoided.

  In the rolling apparatus for metal sheet material of the present invention described in (9) above, since the hydraulic device is omitted, the equipment can be made more compact and less expensive than the apparatus described in (8), and Since the force for sandwiching the upper work roll chock 5 can be reduced, disturbance factors of other controls can be suppressed to a low level.

Next, embodiments of the present invention will be described more specifically with reference to the drawings.
FIG. 1 shows a rolling apparatus relating to the rolling method of the present invention, that is, a preferred embodiment of the rolling apparatus of the present invention. Here, the roll speed is used as the vertical asymmetric component. Although FIG. 1 basically shows only the apparatus configuration on the work side, there is a similar apparatus on the drive side. The rolling direction force acting on the upper work roll 1 of the rolling mill is basically supported by the upper work roll chock 5, but the upper work roll chock includes an upper work roll chock outlet load detection device 9 and an upper work roll inlet load detection. The apparatus 10 is provided, and the force acting between a member such as a project block (not shown) that fixes the upper work roll chock in the rolling direction and the upper work roll chock can be measured. These load detection devices are usually preferably configured to measure compressive force in order to simplify the device configuration.

The upper work roll rolling direction force calculation device (work side) 14 acts on the upper work roll chock 5 by taking the difference between the measurement results obtained by the upper work roll exit side load detection device 9 and the upper work roll entry side load detection device 10. Calculate the rolling direction force.
The above procedure is performed not only on the work side but also on the drive side with the same apparatus configuration, and the result is the upper work roll rolling direction resultant force in the upper work roll rolling direction force calculation device (drive side) 14 '. As obtained.

Further, the rolling direction force acting on the lower work roll 2 is also measured by the lower work roll outlet load detecting device 11 and the lower work roll inlet load detecting device 12 provided on the outlet side and the inlet side of the lower work roll chock 6. Based on the value, the lower work roll rolling direction force calculation device (work side) 15 calculates the rolling direction force acting on the lower work roll chock 6.
The above procedure is performed not only on the work side but also on the drive side with the same apparatus configuration, and the result is obtained in the lower work roll rolling direction in the lower work roll rolling direction force calculation device (drive side) 15 ′. Obtained as a result.

Next, in the work roll rolling direction resultant force calculation device (upper side) 16, the calculation result of the upper work roll rolling direction force calculation device (work side) 14 and the calculation result of the upper work roll rolling direction force calculation device (drive side) 14 ′. By taking the sum of the above, the rolling direction resultant force acting on the upper and lower work rolls is calculated.
Similarly, in the work roll rolling direction resultant force calculation device (lower side) 17, the calculation result of the lower work roll rolling direction force calculation device (work side) 15 and the calculation of the lower work roll rolling direction force calculation device (drive side) 15 ′. By taking the sum of the results, the resultant rolling direction force acting on the upper and lower work rolls is calculated.
Then, by taking the difference between the upper calculation result and the lower calculation result by the upper-lower rolling direction force difference calculation device 18, the difference between the upper and lower rolling direction forces acting on the work roll chock is thereby calculated. Will be.

  Next, based on the calculation result of the difference between the upper side and the lower side of the rolling direction force, in the vertical roll speed control amount calculation device 19, the difference between the upper side and the lower side of the rolling direction force acting on the work roll chock is an appropriate target. A value is calculated, and a vertical asymmetric component control amount of the rolling speed of the rolling mill for preventing warpage is calculated. Here, based on the vertical difference of the rolling direction force, for example, the control amount is calculated by PID calculation considering a proportional (P) gain, an integral (I) gain, and a differential (D) gain. And based on this control amount calculation result, the vertical roll speed control device 20 controls the vertical asymmetric component of the roll speed of the rolling mill, thereby realizing a slight rolling with no warpage or extremely low warpage.

  By the way, in the apparatus configuration described above, until the calculation result of the upper-lower rolling direction force difference calculation device 18 is obtained, basically, the output calculation of a total of eight load detection devices including the upper and lower sides is added. Therefore, the above-described apparatus configuration and calculation order may be arbitrarily changed. For example, the outputs of the work side and drive side output load detection devices may be added first, then the difference between the addition results on the input side may be calculated, and finally the difference between the upper side and the lower side may be calculated. The difference between the upper side and the lower side of the output of the load detection device at each position may be calculated first, the work side and the drive side may be summed, and finally the difference between the entry side and the exit side may be calculated.

  In FIG. 2, the rolling apparatus regarding one another example of the rolling method of this invention, ie, one preferable example of another example of the rolling apparatus of this invention, is shown. In the embodiment of FIG. 2, as compared with the embodiment of FIG. 1, a rolling direction force detection device and a calculation device that act on the drive-side work roll chock are omitted. In general, the moment that acts on the work roll from the rolled material due to the difference in the upper and lower of the elongation strain does not necessarily act equally on the left and right of the work roll, but the time-series change behavior tends to be on the left and right of the work roll. There is no reversal. Therefore, by setting an appropriate control gain in the vertical roll speed control amount calculation device 19, good warpage control based on the vertical difference of the rolling direction force acting on either the work side or the drive side work roll is realized. be able to.

  FIG. 3 shows a preferred embodiment of the rolling apparatus used in the present invention. In the rolling apparatus of FIG. 3, the work roll chock is supported in the vertical direction by a roll balance device (not shown) built in the project blocks 24 and 25 fixed to the housing. In order to measure the force in the rolling direction acting on the upper work roll chock 5, the upper work roll outlet load detecting device 9 is provided between the outgoing project block 24 and the upper work roll chock 5, and the incoming project block 25 and the upper work block 5. Between the roll chock 5, an upper work roll entry side load detection device 10 is provided. In order to measure the force in the rolling direction acting on the lower work roll chock 6, the lower work roll outlet load detection device 11 is provided between the outgoing project block 24 and the lower work roll chock 6, and the incoming project block 25 and the lower work Between the roll chock 6, a lower work roll entry side load detection device 12 is provided. In this way, by providing load detection devices on both the entry side and the exit side, it becomes possible to accurately measure the magnitude of the force regardless of the rolling direction applied to the work roll chock. .

  In FIG. 4, the other preferable form example of the rolling apparatus of this invention is shown. In the rolling apparatus of FIG. 4, the upper reinforcing roll chock 7 is a type in which the upper working roll chock 5 is held. In this case, the upper working roll chock 5 and the upper reinforcing roll are measured in order to measure the rolling direction force acting on the upper working roll chock 5. Between the roll chock 7, an upper work roll exit side load detection device 9 and an upper work roll entry side load detection device 10 are provided. Even in this case, by arranging load detection devices on both the entry side and the exit side of the work roll chock, it is possible to accurately measure the magnitude of the force regardless of the rolling direction applied to the work roll chock. It becomes possible.

  FIG. 5 shows a preferred embodiment of the rolling device of the present invention described in (6) or the rolling device of the present invention described in (7). 5 has an entry work roll chock pressing device 27 adjacent to the work load entry load detecting device 10 on the entry side of the work work roll chock 5, and the work roll chock 5 is predetermined from the entry side to the exit side. Pressing with the pressing force of. By adopting such a configuration, it is possible to stabilize the rolling direction position of the upper work roll chock 5 and improve the responsiveness and accuracy of the rolling direction force measurement that acts on the upper work roll chock 5.

  In the rolling apparatus of FIG. 5, the entry side work roll chock pressing device 27 is a hydraulic device. With this configuration, the work roll chock vibrates instantaneously in the rolling direction as in the case of biting the rolling material. Even in this case, a stable pressing force can be applied to stabilize the movement of the work roll chock.

  FIG. 6 shows a preferred embodiment of the rolling apparatus of the present invention described in (7). In the rolling apparatus of FIG. 6, the upper work roll is offset by Δx in the outlet direction, and the inlet work roll chock pressing device 27 is provided on the entry side of the upper work roll chock 5. With such an arrangement, the offset force acting on the upper work roll 1 from the upper reinforcing roll 3 acts in the direction of pressing the upper work roll chock 5 toward the outlet side, so the force of the entry work roll chock pressing device 27 is reduced. It is possible to make the equipment compact and inexpensive, and the force for sandwiching the upper work roll chock 5 can be reduced, so that other control disturbance factors can be suppressed.

  6, the upper work roll entry side load detection device 10 is omitted, but this is an operation supplied to the hydraulic cylinder of the entry side work roll chock pressing device 27 of FIG. 6 which is a hydraulic device. This is an example in which a hydraulic device itself is used as a load detection device by providing a sensor (not shown) for measuring the pressure of oil.

  FIG. 7 shows another preferred embodiment of the rolling apparatus of the present invention described in (7). In the rolling apparatus of FIG. 7, in addition to the embodiment of FIG. 6, an exit work roll chock position control device 28 is provided on the exit side of the upper work roll chock. The delivery work roll chock position control device 28 is also a hydraulic device. In the rolling apparatus of FIG. 6, the upper work roll chock 5 is formally sandwiched between the entry and exit hydraulic cylinders. In the case of the work roll chock position control device 28, the output work roll chock position detection device 29 is provided for position control, and the chucking force is provided by the entry work roll chock pressing device. With such a structure, it is possible to provide additional control capability such as adjustment of the offset amount of the work roll or the minute cross angle with the reinforcing roll.

  FIG. 8 shows a preferred embodiment of the present invention described in (8). In FIG. 6, when there is Δx that can sufficiently secure the offset force, the installation of the roll chock pressing device 27 can be omitted. At this time, by omitting the hydraulic device, the equipment can be made more compact and less expensive than the device shown in FIG. 6 and the force for sandwiching the upper work roll chock 5 can be reduced. Factors can also be kept small.

  By the way, although the embodiment shown in FIGS. 5, 6 and 7 shows an example in which the work roll chock pressing device is provided on the entrance side of the rolling mill, it may be provided on the exit side. However, the positional relationship with the work roll offset in FIGS. 6 and 7 must be maintained. 5, 6, 7 and 8, only the embodiment in the vicinity of the upper work roll chock is shown, but the embodiment when applied to the lower work roll chock is basically the same.

  FIG. 9 shows a rolling apparatus relating to another embodiment of the rolling method of the present invention, that is, as a preferable another embodiment of the rolling apparatus of the present invention, the up / down asymmetric component control amount is the friction between the rolling roll and the material to be rolled. Indicates the case of a coefficient. The embodiment in FIG. 9 is the same as that in FIG. 1 until the upper-lower rolling direction force difference calculation device 18 calculates the difference between the upper and lower rolling direction forces. Therefore, here, upper work roll rolling direction force calculation device 14, lower work roll rolling direction force calculation device 15, work roll rolling direction force calculation device [adder] (upper side) 16, work roll rolling direction force calculation device [addition] Vessel] (lower side) 17 is omitted.

Next, based on the calculation result of the difference between the upper side and the lower side of the rolling direction force, in the upper and lower lubricant supply amount calculation device 30, the difference between the upper side and the lower side of the rolling direction force acting on the work roll chock is calculated. Calculate the supply amount of the upper and lower lubricants to obtain an appropriate target value and prevent warping.
Based on the control amount calculation result, the upper and lower lubricant supply amount control device 31 controls the upper and lower lubricant supply amounts of the rolling mill to realize a slight rolling with no warpage or extremely warpage. it can.

  FIG. 10 shows a rolling apparatus related to another embodiment of the rolling method of the present invention, that is, as a preferred another embodiment of the rolling apparatus of the present invention, the vertical asymmetric component control amount is the temperature difference between the upper and lower surfaces of the material to be rolled. Indicates a case. The embodiment in FIG. 10 is the same as that in FIG. 1 until the upper-lower rolling direction force difference calculation device 18 calculates the difference between the upper and lower rolling direction forces. Therefore, here, upper work roll rolling direction force calculation device 14, lower work roll rolling direction force calculation device 15, work roll rolling direction force calculation device [adder] (upper side) 16, work roll rolling direction force calculation device [addition] Vessel] (lower side) 17 is omitted.

Next, based on the calculation result of the difference between the upper side and the lower side of the rolling direction force, the difference between the upper side and the lower side of the rolling direction force acting on the work roll chock is calculated in the upper and lower surface temperature difference calculation device 33 of the rolled material. Calculate the temperature difference between the upper and lower surfaces to prevent warping.
Based on the control amount calculation result, the rolling material upper and lower surface temperature control device 34 controls the temperature difference between the rolling material upper and lower surfaces of the rolling mill, so that a slight rolling with no warping or extremely warping can be realized.

  FIG. 11 shows a rolling apparatus according to another embodiment of the rolling method of the present invention, that is, when the vertical asymmetric component control amount is the incident angle of the material to be rolled as a preferable another embodiment of the rolling apparatus of the present invention. Indicates. The embodiment of FIG. 11 is the same as FIG. 1 until the upper-lower rolling direction force difference calculation device 18 calculates the difference between the upper and lower rolling direction forces. Therefore, here, upper work roll rolling direction force calculation device 14, lower work roll rolling direction force calculation device 15, work roll rolling direction force calculation device [adder] (upper side) 16, work roll rolling direction force calculation device [addition] Vessel] (lower side) 17 is omitted.

Next, based on the calculation result of the difference between the upper side and the lower side of the rolling direction force, in the roller table height calculating unit 36, the difference between the upper side and the lower side of the rolling direction force acting on the work roll chock is appropriately set. Set to the target value and calculate the roller table height to prevent warping.
Based on the control amount calculation result, the roller table height control device 37 controls the height of the roller table of the rolling mill so that rolling with little or no warpage can be realized.

  In FIG. 12, the rolling apparatus relating to another embodiment of the rolling method of the present invention, that is, as a preferable another embodiment of the rolling apparatus of the present invention, the vertical asymmetric component control amount is the horizontal position of the upper and lower work roll chock. Show the case. The embodiment in FIG. 12 is the same as in FIG. 1 until the upper-lower rolling direction force difference calculation device 18 calculates the difference between the upper and lower rolling direction forces. Therefore, here, upper work roll rolling direction force calculation device 14, lower work roll rolling direction force calculation device 15, work roll rolling direction force calculation device [adder] (upper side) 16, work roll rolling direction force calculation device [addition] Vessel] (lower side) 17 is omitted.

Next, based on the calculation result of the difference between the upper side and the lower side of the rolling direction force, the difference between the upper side and the lower side of the rolling direction force acting on the work roll chock is determined in the control amount calculation device 39 of the upper and lower work roll chock positions. The upper and lower work roll chock positions for calculating an appropriate target value and preventing warpage are calculated.
And based on this control amount calculation result, by controlling the vertical work roll chock position of the rolling mill with the control device 40 for the vertical work roll chock position, it is possible to realize a slight rolling with no warp or extremely warp.

  FIG. 13 shows a rolling apparatus relating to another embodiment of the rolling method of the present invention, that is, as a preferable another embodiment of the rolling apparatus of the present invention, the up and down asymmetric component control amounts are the roll speed and rolling roll of the rolling mill. The case where it is a friction coefficient with a material to be rolled is shown. The embodiment of FIG. 13 is the same as FIG. 1 until the upper-lower rolling direction force difference calculation device 18 calculates the difference between the upper and lower rolling direction forces. Therefore, here, upper work roll rolling direction force calculation device 14, lower work roll rolling direction force calculation device 15, work roll rolling direction force calculation device [adder] (upper side) 16, work roll rolling direction force calculation device [addition] Vessel] (lower side) 17 is omitted.

Next, based on the calculation result of the difference between the upper side and the lower side of the rolling direction force, the upper and lower roll direction forces acting on the work roll chock are controlled by the upper and lower roll speed control and the upper and lower lubricant supply amount calculation unit 43. The upper and lower roll speeds and the upper and lower lubricant supply amounts for preventing warpage are calculated by setting the difference from the side to an appropriate target value.
And based on the control amount calculation result, the upper and lower roll speed control device 20 and the upper and lower lubricant supply amount control device 31 control the upper and lower roll speed and the upper and lower lubricant supply amount so that no warpage occurs, or It is possible to realize extremely mild warping.

As a rolling device of the present invention, the result of hot rolling of iron with a reverse rolling mill having a work roll diameter of 1000 mm shown in FIG. 3 is shown below.
Rolling was performed with a plate of the same size having an inlet side thickness of 46 mm and a plate width of 2800 mm, with an outlet side thickness of 10 mm in 7 passes. The average warpage of 57 rolled plates was 12 mm, and the warpage was small. Did not occur.
As a comparative example, a plate having the same dimensions was rolled using a method of controlling warpage by giving a temperature difference between the plates shown in Patent Document 1. As a result, the average warpage of 48 rolled sheets was 68 mm, and a large warp was generated.
In addition, even if the type of the rolling mill is changed to FIGS. 4 and 9 to 13 and the detection method of the rolling direction force is changed to the method shown in FIGS. Needless to say, rolling is realized.

The rolling apparatus regarding the rolling method of this invention, The rolling apparatus of this invention, The figure which shows typically preferable embodiment at the time of setting the up-down asymmetrical component control amount as described in (5) to the roll speed of a rolling mill It is. A rolling apparatus related to the rolling method of the present invention, which is a rolling apparatus of the present invention, schematically illustrates another preferred embodiment in the case where the controlled amount of up-and-down asymmetric component described in (5) is set to the roll speed of a rolling mill. FIG. It is a figure which shows typically the preferable form example of the rolling apparatus used by this invention. It is a figure which shows typically the other preferable form example of the rolling apparatus used by this invention. It is a figure which shows typically preferable embodiment of the rolling apparatus of this invention as described in (6), or the rolling apparatus of this invention as described in (7). It is a figure which shows typically preferable embodiment of the rolling apparatus of this invention as described in (8). It is a figure which shows typically other preferable embodiment of the rolling apparatus of this invention as described in (8). It is a figure which shows typically preferable embodiment of the rolling apparatus of this invention as described in (9). In the rolling apparatus of this invention as described in (5), it is a figure which shows typically preferable embodiment at the time of setting the up-and-down asymmetric component control amount as the friction coefficient of a rolling roll and a to-be-rolled material. In the rolling apparatus of this invention as described in (5), it is a figure which shows typically preferable embodiment at the time of making the up-and-down asymmetric component control amount into the upper and lower surface temperature difference of a to-be-rolled material. In the rolling apparatus of this invention as described in (5), it is a figure which shows typically preferable embodiment at the time of setting the up-and-down asymmetric component control amount as the incident angle of a to-be-rolled material. (5) In the rolling apparatus of this invention as described in (5), it is a figure which shows typically preferable embodiment at the time of making the up-down asymmetric component control amount into the horizontal direction position of an up-down work roll chock. The rolling apparatus of this invention as described in (5) WHEREIN: It is a figure which shows typically preferable embodiment at the time of making the up-down asymmetrical component control amount into the roll speed of a rolling mill, and the friction coefficient of a rolling roll and a to-be-rolled material. is there.

Explanation of symbols

1 Upper work roll 2 Lower work roll 3 Upper reinforcement roll 4 Lower reinforcement roll 5 Upper work roll chock (working side)
6 Lower work roll chock (work side)
7 Upper reinforcement roll chock (working side)
8 Lower reinforcement roll chock (working side)
9 Upper work roll outlet load detector (work side)
10 Upper work roll entry side load detection device (work side)
11 Lower work roll exit side load detector (work side)
12 Lower work roll entry side load detector (work side)
13 Reduction device 14 Upper work roll rolling direction force calculation device (work side)
14 'Upper work roll rolling direction force calculation device (drive side)
15 Lower work roll rolling direction force calculation device (work side)
15 'Lower work roll rolling direction force calculation device (drive side)
16 Work roll rolling direction resultant force calculation device [adder] (upper side)
17 Work roll rolling direction resultant force calculation device [adder] (lower side)
18 Upper-lower rolling direction force difference calculation device 19 Vertical roll speed control amount calculation device 20 Vertical roll speed control device 21 Metal plate material 22 Rolling direction 23 Mill housing 24 Outside project block 25 Incoming project block 26 Rolling load detection device 27 Incoming work roll chock pressing device 28 Outgoing work roll chock position control device 29 Outgoing work roll chock position detection device 30 Upper and lower lubricant supply amount calculation device 31 Upper and lower lubricant supply amount control device 32 Upper surface lubricant supply device 32 'Lower surface lubricant supply device 33 Rolling material upper and lower surface temperature difference computing device 34 Rolling material upper and lower surface temperature control device 35 Rolling material upper surface heating device 35' Rolling material upper surface heating device 36 Roller table height computing device 37 Roller table height control device 38 Vertically variable roller Buru 39 vertical work roll chock position control calculation unit 40 up and down the working controller 41 on work roll chock position roll chock position moving device (material entry side)
41 'Lower work roll chock position moving device (material entry side)
42 Upper work roll chock position moving device (material delivery side)
42 'Lower work roll chock position moving device (material delivery side)
43 Upper / lower roll speed control and upper / lower lubricant supply amount calculation device M Mill motor

Claims (9)

  A method of rolling a metal sheet using a rolling machine for a metal sheet having at least a work roll and a reinforcing roll, measuring the rolling direction force acting on the roll chock of both the upper and lower work rolls, and the rolling direction force A method for rolling a metal sheet, comprising calculating a difference between an upper side and a lower side, and controlling a vertical asymmetric component of rolling using the rolling mill based on the difference. The up and down asymmetric component of the controlled roll is
Up-down asymmetric component of roll speed of the rolling mill,
Up and down asymmetric components of the friction coefficient between the rolling roll and the material to be rolled,
Vertically asymmetric component of the temperature difference between the upper and lower surfaces of the material to be rolled,
A vertically asymmetric component of the incident angle of the material to be rolled, and
Vertical asymmetrical component of the horizontal position of the vertical work roll chock,
The method for rolling a metal sheet according to claim 1, wherein any one of the above or a combination of two or more thereof is used.   The method for rolling a metal sheet according to claim 1 or 2, wherein the work roll is offset on the entry side or the exit side in the rolling direction of the work roll chock with reference to the reinforcing roll. A rolling device including a rolling mill of a metal plate material having at least a work roll and a reinforcing roll, the rolling direction of the work roll chock measuring the rolling direction force acting on the upper and lower roll chocks of both the upper and lower work rolls A load detection device provided on both the entry side and the exit side;
An arithmetic device that calculates the difference between the upper side and the lower side of the rolling direction force acting on the work roll chock based on the measurement value by the load detection device,
A computing device that computes a vertical asymmetric component control amount of the rolling mill based on the computed value;
A rolling device for a metal sheet, comprising: a control device that controls the vertical asymmetric component control amount of the rolling mill based on a calculated value of the vertical asymmetric component control amount. The up / down asymmetric component control amount to be controlled is
Asymmetrical component control amount of the roll speed of the rolling mill,
Asymmetrical control amount of the friction coefficient between the rolling roll and the material to be rolled,
Asymmetrical component control amount of the temperature difference between the upper and lower surfaces of the material to be rolled,
Control amount of up / down asymmetric component of incident angle of material to be rolled, and
Asymmetrical component control amount for the vertical position of the vertical work roll chock,
The rolling device for a metal sheet according to claim 4, wherein the rolling device is any one of or a combination of two or more thereof.   6. The apparatus for rolling a metal sheet according to claim 4 or 5, further comprising a device that presses the work roll chock in the rolling direction on either the entry side or the exit side of the work roll chock.   The apparatus for pressing a work roll chock in a rolling direction is a hydraulic apparatus, and the rolling apparatus for a metal sheet according to claim 6.   It is provided with a hydraulic device that presses the work roll chock in the rolling direction on the opposite side of the work roll chock in the rolling direction on the entry side and the exit side to the side on which the work roll is offset with respect to the reinforcing roll. Item 8. A rolling apparatus for a metal sheet according to Item 7.   The rolling device for a metal sheet according to claim 4 or 5, wherein the work roll is offset with respect to the reinforcing roll and a load detecting device for measuring the force in the rolling direction is provided only on the offset side.

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