JP2007190579A - Method and equipment for rolling metallic sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling method and rolling equipment for manufacturing a metallic sheet having no camber with simpler equipment than conventional one. <P>SOLUTION: In a method of rolling the metallic sheet which is performed by using a rolling mill for metallic sheets having at least work rolls and back up rolls, in this method of rolling the metallic sheet and equipment for attaining this method, the work rolls are offset by taking the back up rolls as reference; forces which act on roll chocks on the work side and the drive side of the work roll on the offset sides, that is, offset component forces are measured, the difference between the offset component forces on the work side and the drive side is calculated and right and left asymmetric components of the roll opening-degree of the rolling mill are controlled on the basis of this difference. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rolling method and a rolling apparatus for a metal plate, and in particular, a rolling method for a metal plate that can stably produce a light metal plate without a camber or extremely camber with simpler equipment than before. And a rolling device.

  In the rolling process for metal sheets, rolling the rolled sheet without cambers, that is, without bending left and right, not only avoids poor planar shape and poor dimensional accuracy of the rolled material, but also avoids troubles such as meandering and squeezing. It is also important to do. In the present invention, in order to simplify the notation, the working side and the driving side of the rolling mill, which are the left and right when the rolling direction is the front, are referred to as left and right.

For such a problem, in Patent Document 1, a device for measuring the width direction position of the rolled material is provided on the entry side and the exit side of the rolling mill, and the camber of the rolled material is calculated from the measured value, and this is corrected. Thus, a camber control technique for adjusting the position of an edger roll disposed on the entrance side of the rolling mill is disclosed.
Further, Patent Document 2 discloses a camber control technique for controlling the left / right difference of the roll opening of the rolling mill, that is, the reduction leveling, based on the left / right difference of the load of the edger rolls arranged on the entry side and the exit side of the rolling mill. Is disclosed.

Further, Patent Document 3 discloses a camber control technique for analyzing a measured value of a left-right difference in rolling load and controlling a left-right difference in roll opening, that is, a reduction leveling, or controlling a position of a side guide. Yes.
Further, Patent Document 4 discloses a method of controlling a camber by restraining a rolled material with an entrance edger roll, a side guide, and an exit side guide.
However, in the invention related to the camber control technique based on the measurement of the position in the width direction of the rolled material described in the above-mentioned Patent Document 1, it is fundamental to correct the camber that has already occurred, thus preventing the occurrence of camber. It is virtually impossible.

In the invention relating to the camber control technology based on the left / right difference between the edger roll load on the entrance / exit side of the rolling mill described in Patent Document 2, when the camber already exists in the entry side rolled material, It becomes difficult to obtain high control accuracy. In addition, the exit edger roll must be retracted when the rolled material tip passes through to prevent the rolled material tip from colliding with the edger roll, and it is difficult to control the camber from the rolled material tip. It is.
Further, in the invention relating to the camber control by the rolling load left / right difference described in Patent Document 3, the thickness of the entrance side of the rolled material is not uniform in the sheet width direction, or the temperature distribution of the rolled material is not uniform in the sheet width direction. In this case, the method of estimating the camber from the difference between the left and right rolling loads is extremely impractical and is not practical.

In the invention relating to the camber control by the entry side edger roll, the entry side guide and the exit side guide described in Patent Document 4, if the exit side guide can completely restrain the exit side rolled material, the exit side camber is removed. Although it is possible to make it zero, it is necessary to make the exit side guide wider than the width of the rolled material plate in order to smoothly carry out the rolling operation, and camber is generated in the rolled material by this margin. Become.
It can be said that the problems of the prior art as described above are due to the fact that there is no method for measuring and controlling the camber generated due to various causes with high accuracy and without time delay.

As a technique that may be able to solve the problems of the above technique, there is a camber control technique described in Patent Document 5 based on a rolling direction force left-right difference. This technology directly detects the moment acting on the material due to the left-right difference in the elongation rate that causes camber as the left-right difference in the rolling direction force acting on the work roll chock, and controls the reduction leveling. Measurement and control without time delay.
Generally, the cause of camber due to rolling includes poor roll gap setting, left-right difference in the thickness of the entry side of the rolled material, or left-right difference in deformation resistance, but in any case, the cause is ultimately caused by rolling. By causing a left-right difference in the elongation strain in the rolling direction, the advance rate and the reverse rate change in the sheet width direction, resulting in a left-right difference in the exit side speed and the entry side speed of the rolled material, resulting in camber. At this time, for example, at the time of rolling the front end portion of the rolled material, the length of the rolled material on the exit side, which has already been rolled, is short, so it is relatively free to produce a left-right difference in the exit side speed. In order to make a difference, it is necessary to rotate the entire rolled material existing on the entry side in a horizontal plane within a horizontal plane. However, since a long unrolled material is generally left on the entrance side during tip rolling, a moment against the rigid body rotation is generated by the friction 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 difference in the rolling direction acting on the work roll chock part.

  The moment acting mainly from the entry side rolling material at the time of tip rolling as described above is the measurement of the rolling direction force acting on the work side and driving side roll chock of the work roll, and the working side rolling direction force and drive. It can be detected by calculating the difference from the rolling direction force on the side, that is, the difference between the rolling direction force left and right. This moment is generated only when the left-right difference in elongation strain causing camber generation occurs as described above, and the moment also occurs almost simultaneously with the occurrence of the elongation strain difference. It is possible to prevent the occurrence of camber by manipulating the left-right asymmetric component of the roll opening degree of the rolling mill, that is, the reduction leveling, in the direction of reducing the rolling angle.

  The above principle is the same when rolling the tail end of the rolled material. When the tail end is rolled, the length of the rolled material on the exit side, which has already been rolled, is long. When trying to do so, a moment to resist this is generated mainly from the rolled material on the exit side, and this is transmitted as a reaction force to the work roll. In this case as well, the left-right difference in the rolling direction force acting on the work roll chock is measured and calculated. It is possible to detect the occurrence of left-right difference in elongation strain by operating the asymmetrical component of the roll opening of the rolling mill, that is, the reduction leveling, in the direction to reduce the rolling direction force left-right difference. It is possible to prevent the occurrence of camber in the section.

Based on the principle as described above, the force in the rolling direction acting on the work side and the drive side roll chock of the work roll is measured, and the difference between the rolling direction force on the working side and the rolling direction force on the driving side, that is, the rolling direction force. A rolling method is disclosed as an invention described in Patent Document 5, in which a left-right difference is calculated and the rolling leveling of the rolling mill is operated in a direction to reduce the rolling direction force left-right difference.
JP-A-4-305304 JP-A-7-214131 JP 2001-105013 A Japanese Patent Laid-Open No. 8-323411 International Publication WO 2004-082860

However, in the invention disclosed in Patent Document 5, in order to measure the rolling direction force acting on the entry side and the exit side of the work direction and the drive side of the work roll chock, the work side and the drive side of the work roll chock are measured. In the case of equipment with a hydraulic actuator on both the inlet and outlet sides or a hydraulic actuator on one of the inlet and outlet sides, it is essential to install a pressure sensor and a load detector on the other side. There is a concern that the above-described camber control cannot be applied to a rolling mill that does not include all of the measuring devices.
Accordingly, the present invention advantageously solves the above-described problems of the prior art relating to camber control, and stably manufactures a light metal plate material having no camber or extremely camber with simpler equipment than before. An object of the present invention is to provide a rolling method and a rolling apparatus for a metal sheet.

  The inventors have obtained the following findings as a means for solving the above-mentioned concerns after intensive studies. That is, by offsetting the work roll on the basis of the reinforcing roll, a force in the rolling direction (hereinafter also referred to as offset component force) always acts on the work roll chock on the offset side. Is measured on the work side and the drive side, and load level control is performed based on the difference between the work side and the drive side of this offset component force, and load detection devices are provided on both the entry side and the exit side in the rolling direction of the work roll chock. It has been found that camber control can be performed by the difference in the rolling direction force between the rolling mills that are not used, that is, with simpler equipment than conventional rolling mills.

The gist of the present invention for solving the problems of the prior art as described above is as follows.
(1) In a method of rolling a metal plate material using a rolling machine for a metal plate material having at least a work roll and a reinforcing roll, the working side of the work roll on the offset side is offset with respect to the reinforcing roll. And the rolling direction force acting on the roll chock on the driving side (hereinafter also referred to as offset component force) is measured, and the difference between the working side and the driving side of the offset component force is calculated. Based on this difference, the rolling mill A rolling method for a metal plate material, characterized by controlling a left-right asymmetric component of the roll opening degree of the metal plate.
(2) In a rolling device including at least a metal sheet material rolling mill having a work roll and a reinforcing roll, the work side on the offset side of the work roll and the roll chock on the drive side have load detection devices, and the load detection An apparatus for rolling a metal sheet, characterized in that the apparatus has a function of measuring an offset component force acting on the work side of the work roll on the side offset with respect to the reinforcing roll and the roll chock on the drive side.
(3) A computing device that computes a difference between the working side and the driving side of the offset component force acting on the work roll chock based on the measurement value by the load detection device, and the roll opening of the rolling mill based on the computed value And a control device for controlling the roll opening of the rolling mill based on the calculated value of the left-right asymmetric component control amount of the roll opening, The rolling device for a metal sheet according to (2).

In the rolling method of the metal plate material of the present invention described in (1), in order to solve the above-described problem, the work side of the work roll on the side offset with respect to the reinforcing roll and the roll chock on the drive side Measure the offset component force acting on the camber, calculate the difference between the working side and the drive side of the offset component force, and implement the reduction leveling control in the direction to reduce this difference, that is, the offset component left-right difference. A method to control is proposed. This offset component force acts on the work roll chock on the offset side by always offsetting the work roll on the basis of the reinforcing roll, so it can be measured by providing a load detection device on the work roll chock only on the offset side. it can. In addition, this enables the above-described camber control to be performed even in a simpler facility than the conventional one that does not have a load detection device on both the entrance side and the exit side in the rolling direction, and the load detection device can be reduced compared to the conventional case. Therefore, the cost of equipment can be reduced.

As described above, in the method for rolling a metal sheet according to the present invention described in (1), the force in the rolling direction between the working side and the drive side, that is, the offset component force is measured, and the difference in the offset component force left and right is reduced. By implementing the rolling leveling control, it is possible to accurately detect and measure the left-right difference in elongation strain due to rolling, which is the direct cause of camber generation, and by implementing the rolling leveling operation to make this uniform, Therefore, it is possible to realize a very thin rolling of the camber.
Next, the effect of this invention regarding the rolling apparatus for enforcing the rolling method of the metal plate material of this invention described in (1) is demonstrated.

In the rolling apparatus for a metal sheet material of the present invention described in (2), the load side is provided on the work side and the drive side roll chock of the work roll on the side offset with respect to the reinforcing roll, so the work side And the force of the rolling direction which acts on each roll chock of a drive side, ie, an offset component force, can be calculated | required. By calculating the difference between the offset component force acting on the work side roll chock and the offset component force acting on the drive side roll chock, the rolling method of the metal plate material described in (1) can be performed.

The rolling device for a metal sheet material of the present invention described in (3) has the following functions in addition to the rolling device described in (2).
1) Since an arithmetic device for calculating the difference between the work side and the drive side of the offset force acting on the work roll chock is provided, the difference between the offset component force acting on the work side roll chock and the offset component force acting on the drive side roll chock That is, the offset component left-right difference can be calculated.
2) By determining the offset component left-right difference, the moment acting on the work roll from the rolled material due to the left-right difference in elongation strain in the rolling direction that causes camber can be detected.
3) An arithmetic device for calculating the left-right asymmetric component control amount of the roll opening of the rolling mill for equalizing the elongation strain on the left and right based on the offset component left-right difference, and the calculation of the left-right asymmetric component control amount of the roll opening Since a control device for controlling the roll opening degree of the rolling mill based on the value is provided, camber control based on the offset component force left-right difference can be performed.

Eventually, the above function makes it possible to carry out the method for rolling a metal plate described in (1), preventing the occurrence of left-right difference in elongation strain, and having no camber or a very light camber with a camber. Can be rolled.
As described above, by using the rolling method and rolling apparatus of the present invention, it becomes possible to stably manufacture a light metal plate material having no camber or extremely camber with simpler equipment than before. It is possible to realize a significant improvement in productivity, yield and reduction in equipment cost in the rolling process of the plate material.

Next, embodiments of the present invention will be described more specifically with reference to the drawings.
FIG. 1 shows a preferred embodiment of a rolling apparatus for realizing the rolling method of the present invention described in (1) or the rolling apparatus of the present invention described in (2) or (3). FIG. 1 basically shows only the apparatus configuration on the work side, but there is a similar apparatus on the drive side. The upper work roll 1 is offset to the outlet side with respect to the upper reinforcing roll 3. The offset component 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 offset side load detection device 9 is provided on the offset side of the upper work roll chock. The force acting between a member such as a project block (not shown) fixing the upper work roll chock in the rolling direction and the upper work roll chock can be measured. Since the offset component force always acts in the rolling direction on the offset side (here, the exit side), even if there is no load detection device on the side opposite to the offset side (here, the entry side), the upper working roll chock 5 is in the rolling direction. The acting force, that is, the offset component force can be calculated.

  Further, since these load detection devices only need to have a structure for measuring only the compressive force, the device configuration can be made simple and inexpensive. In addition, since it is only necessary to arrange the load detection device only on the offset side, the load detection device can be reduced as compared with the conventional case, and the equipment cost and the modification cost for the installation can be reduced. Further, regarding the offset component force acting on the lower work roll chock 2, the offset component force acting on the lower work roll chock 6 based on the measurement value of the lower work roll offset side load detection device 10 arranged on the offset side of the lower work roll chock 6. Is calculated. Next, in the work roll offset component force vertical resultant force calculation device 12, by taking the sum of the measured value of the upper work roll offset side load detection device 9 and the measurement value of the lower work roll offset side load detection device 10, Calculates the resultant offset component force vertical 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 obtained as the work roll offset component force up / down resultant force 13 on the drive side. Then, the difference between the calculation result on the work side and the calculation result on the drive side is calculated by the work side-drive side offset component force difference calculation device 15, and thereby the difference between the work side and the drive side in the rolling direction force acting on the work roll chock. That is, the offset component force left-right difference is calculated. The offset component force generally increases with the rolling load. However, in the camber control of the present invention, the offset component force is used as a difference between the working side and the drive side, and this influence is cancelled. Further, the offset of the work roll for generating the offset component force may be set to an appropriate value based on the operation conditions such as the rolling load so that the offset component force is larger than the rolling direction force generated by the camber generation. Next, on the basis of the calculation result of the offset component force left / right difference, the rolling leveling control amount calculation device 16 sets the offset component force left / right difference to an appropriate target value and prevents the camber from moving to the right and left of the roll opening degree of the rolling mill. The asymmetric component control amount is calculated. Here, on the basis of the offset component force left-right difference, for example, the left-right asymmetric component control amount of the roll opening is calculated by PID calculation taking into account the proportional (P) gain, integral (I) gain, and differential (D) gain. . Based on the control amount calculation result, the rolling leveling control device 17 controls the left-right asymmetric component of the roll opening of the rolling mill, so that no camber is generated or the camber is extremely light with simpler equipment than before. Rolling can be realized.

  FIG. 2 shows another preferred embodiment of the rolling device relating to the rolling method of the present invention described in (1) or the rolling device of the present invention described in (2) or (3). In the embodiment of FIG. 2, the offset component force detection device and the arithmetic device acting on the lower work roll chock are omitted as compared with the embodiment of FIG. 1. In general, the moment acting on the work roll from the rolled material due to the left-right difference in the elongation strain does not necessarily act equally on the upper and lower work rolls, but the time series change behavior reverses the trend on the upper and lower work rolls. There is nothing. Therefore, in the work-side / drive-side offset component force difference calculation device 15, the difference between the measurement value of the work-side upper work roll offset-side load detection device 9 and the drive-side upper work roll offset-side load detection device measurement value 14 is calculated. In addition, by setting an appropriate control gain in the reduction leveling control amount calculation device 16, it is possible to realize good camber control based on the offset component force left-right difference acting on either the upper or lower work roll.

  FIG. 3 shows a preferred embodiment of the rolling apparatus of the present invention described in (2) or (3). 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 21 and 22 fixed to the housing. The upper work roll 1 is offset to the outlet side with respect to the upper reinforcing roll 3. In order to measure the offset component force acting on the upper work roll chock 5, the upper work roll offset side load detection device 9 is provided between the offset-side project block 21 and the upper work roll chock 5. Further, the lower work roll 2 is offset to the outlet side with respect to the lower reinforcing roll 4. In order to measure the offset component force acting on the lower work roll chock 6, the lower work roll offset side load detection device 10 is provided between the offset-side project block 21 and the lower work roll chock 6. Thus, the offset component force always acts on the work roll chock on the offset side, so that the force acting in the rolling direction of the work roll chock can be accurately measured by providing a load detection device on the work roll chock on the offset side only. Is possible.

  FIG. 4 shows another preferred embodiment of the rolling apparatus of the present invention described in (2) or (3). In the rolling apparatus of FIG. 4, the upper reinforcing roll chock 7 is a type in which the upper work roll chock 5 is held. In this case, since the upper work roll 1 is offset to the outlet side with respect to the upper reinforcement roll 3, the upper work roll chock 5 and the upper reinforcement roll chock 7 are measured in order to measure the offset component force acting on the upper work roll chock 5. The upper work roll offset side load detection device 9 is provided. Also in this case, the offset component force always acts on the work roll chock on the offset side, so that the force acting in the rolling direction of the work roll chock can be accurately measured by providing a load detection device on the work roll chock on the offset side only. Is possible.

The example at the time of applying the plate rolling method as described in (1) of this invention using the rolling mill shown in FIG. 1 is demonstrated.
Table 1 shows measured values of the camber when the camber control based on the offset component force left-right difference of the present invention is applied to the tip portion and the steady portion. Table 1 also shows, as Comparative Example 1, for the rolled material having the same dimensions and rolling conditions, load detection on the entry side and the exit side in a rolling mill equipped with load detection devices on both the entry side and the exit side in the rolling direction. As a comparative example 2, the measured values of the camber at the tip and the steady part when the rolling direction force is calculated from the measured value of the apparatus and the camber control is performed based on the difference between the rolling direction force on the working side and the driving side, The measured values of the camber at the tip and the steady part when camber control is performed using the side guide are also shown. As shown in Table 1, it can be seen that the actual measured camber value per meter is almost the same in both the present invention and Comparative Example 1. Moreover, it can be seen that the measured camber values of the present invention and Comparative Example 1 were smaller for both the tip and the steady part than for Comparative Example 2.

以上のように、本発明の圧延方法および圧延装置を用いることによって、従来より簡易的な設備で、キャンバーのない、あるいは極めてキャンバーの軽微な圧延が実現できることが確認でき、従来に比べ荷重検出装置の省略が可能となったため、設備コスト及びその改造コストの低減が実現できた。

As described above, by using the rolling method and the rolling apparatus of the present invention, it can be confirmed that a simpler facility than the conventional one and no camber or extremely light camber can be realized. Since it became possible to reduce the cost of equipment, it was possible to reduce the equipment cost and its modification cost.

It is a figure which shows typically preferable embodiment of the rolling apparatus which implement | achieves the rolling method of this invention as described in (1), or the rolling apparatus of this invention as described in (2) or (3). It is a figure which shows typically preferable embodiment of the rolling apparatus which implement | achieves the rolling method of this invention as described in (1), or the rolling apparatus of this invention as described in (2) or (3). It is a figure which shows typically preferable embodiment of the rolling apparatus of this invention as described in (2) or (3). It is a figure which shows typically other preferable embodiment of the rolling apparatus of this invention as described in (2) or (3).

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 offset side load detector (work side)
10 Lower work roll offset side load detection device (work side)
11 Rolling device 12 Work roll offset component force vertical resultant force calculation device [adder] (working side)
13 Work roll offset component resultant force (drive side)
14 Upper work roll offset side load detector measurement value (drive side)
DESCRIPTION OF SYMBOLS 15 Work side-drive side offset component force difference calculating device 16 Rolling leveling control amount calculating device 17 Rolling leveling control device 18 Rolling leveling control device 18 Metal plate material 19 Rolling direction 20 Mill housing 21 Outgoing project block 22 Incoming project block 23 Rolling load detecting device

Claims (3)

  In a rolling method of a metal plate material performed using a rolling machine for a metal plate material having at least a work roll and a reinforcement roll, the working side and the driving side of the work roll on the offset side are offset with respect to the reinforcing roll. The force in the rolling direction acting on the roll chock (hereinafter also referred to as offset component force) is measured, the difference between the offset component force on the working side and the drive side is calculated, and the roll opening of the rolling mill is calculated based on this difference. A method for rolling a metal sheet, characterized by controlling the left-right asymmetric component of the degree.   In a rolling apparatus including a rolling mill of a metal plate material having at least a work roll and a reinforcing roll, the work roll on the work side on the offset side of the work roll and a roll chock on the drive side have a load detection device, and the load detection apparatus is An apparatus for rolling a metal sheet, which has a function of measuring an offset component force acting on a work side and a drive side roll chock of the work roll on the offset side with respect to a reinforcing roll. An arithmetic device that calculates the difference between the working side and the driving side of the offset component force acting on the work roll chock based on the measurement value by the load detection device, and the left-right asymmetry of the roll opening of the rolling mill based on the calculated value The apparatus according to claim 2, further comprising: a calculation device that calculates a component control amount; and a control device that controls the roll opening degree of the rolling mill based on a calculation value of a left-right asymmetric component control amount of the roll opening amount. The rolling apparatus of the metal plate material of description.

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