JP7255614B2 - CAMBER CONTROL DEVICE AND METHOD FOR MANUFACTURING METAL PLATE - Google Patents

Description

TECHNICAL FIELD The present invention relates to a camber control device for suppressing camber of a steel plate and a method for manufacturing a metal plate.

Some hot-rolled coils are shaped by a rough leveler on a slitter line that divides them into two or more pieces in the width direction. be corrected. The material cut out in this way is used, for example, as a frame material for the bed of a truck.

At the time of slitting by a slitter, the residual stress distributed in the hot-rolled coil is released at the time of slitting, and lateral bending (camber) may occur in the slitted metal sheet. If camber occurs during cutting, it may lead to operational troubles such as meandering of the metal plate and squeezing during cutting. In addition, if the thickness difference (crown) in the width direction of the metal plate is large, the camber generated by the slitter is further enhanced by the difference in elongation in the width direction caused by the crown during light reduction due to shape correction by the final leveler. be.

If camber occurs, from the viewpoint of quality, the frame material cut in the length direction from the stripped metal plate will be degraded from the first grade product, and the shape of the part after press molding the frame material. There is a problem that the yield deteriorates due to poor dimensional accuracy.

As a means of solving this problem, there is a method of arranging split backup rolls on the leveler. The split backup rolls have a mechanism for supporting the work roll with backup rolls split in the roll axial direction. Each split backup roll can be independently controlled to roll down. Camber can be suppressed by controlling the amount of rolling reduction according to the position in the axial direction by using the split backup rolls.

Patent Document 1 discloses a metal sheet rolling mill having a mechanism in which one or both of the upper and lower roll assemblies support work rolls by backing rolls divided into three or more axially divided rolls. In Patent Document 1, one or both of the left-right balance in the rolling direction acting on the metal plate from the pinch rolls and the left-right balance in the rolling direction acting on the work rolls of the rolling mill through the metal plate is measured, or the measured value and by controlling the left-right asymmetry component of the opening degree of the rolls of the rolling mill based on the measured value or the calculated value of the left-right balance of the rolling direction force, the left-right balance of the metal plate is adjusted and the camber suppress

Japanese Patent Application Laid-Open No. 2004-283851

However, the method of Patent Document 1 is based on either or both of the lateral balance in the rolling direction acting on the metal plate from the pinch rolls and the lateral balance in the rolling direction acting on the work rolls of the rolling mill through the metal plate. The left-right asymmetric component of the roll opening of the rolling mill is controlled, and the camber that occurs after stripping cannot be suppressed.

Specifically, the greater the crown (thickness difference between the center and edge of the sheet width) of the metal sheet before slitting, the greater the camber that occurs after slitting. A difference occurs, and as a result, rolling a stripped metal sheet with a large thickness difference increases the camber.

Since the technique of Patent Document 1 detects the lateral balance in the rolling direction acting on pinch rolls or work rolls, it can only detect the lateral balance of the metal sheet before slitting. Therefore, even if the technique disclosed in Patent Document 1 is applied, it is not possible to suppress the camber after cutting when a bilaterally symmetrical crown occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a camber control device and a method for manufacturing a metal plate that can suppress the camber that occurs during strip cutting.

The gist of the present invention is as follows.
[1] A rough leveler for correcting the shape of a metal plate;
a slitter installed downstream of the rough leveler for dividing the metal plate into two or more pieces in the width direction;
A final leveler installed on the downstream side of the slitter for correcting the shape of the metal plate split in the width direction;
A shape measuring device that measures at least one of the thickness deviation in the plate width direction of the metal plate or the amount of camber generated in the metal plate,
At least one of the rough leveler and the final leveler is divided into two or more in the axial direction of the work rolls, and has a divided backup roll capable of independently controlling the amount of reduction, and measures the plate thickness deviation and camber amount measured by the shape measuring device. A camber control device that controls the amount of roll reduction of the split backup roll based on at least one of them.
[2] The shape measuring device is a camber measuring device that is installed downstream of the slitter and measures the amount of camber of the metal plate split in the width direction,
The camber control device according to [1], wherein the reduction amount of the split backup roll is controlled based on the camber amount measured by the camber measuring device.
[3] The shape measuring device is a profile measuring device that measures the plate thickness deviation in the plate width direction of the metal plate,
The camber control device according to [1] or [2], wherein the reduction amount of the split backup roll is controlled based on the plate thickness deviation in the plate width direction measured by the profile measuring device.
[4] The camber control device according to any one of [1] to [3], wherein the split backup roll is arranged at least at a position corresponding to the cutting position of the metal plate by the slitter.
[5] Measure at least one of the thickness deviation in the width direction of the metal plate or the amount of camber generated in the metal plate,
A divided backup roll that is divided into two or more in the axial direction of at least one of the rough leveler and the final leveler work roll based on at least one of the measured plate thickness deviation in the plate width direction or the amount of camber generated in the metal plate. A method for manufacturing a metal plate, in which the amount of reduction is independently controlled to correct the shape of the metal plate.
[6] Measuring the amount of camber of the metal plate divided in the width direction downstream of the slitter,
The method for producing a metal plate according to [5], wherein the reduction amount of at least one of the split backup rolls of the rough leveler and the final leveler is controlled based on the measured camber amount.
[7] Measure the plate thickness deviation in the plate width direction,
The method for producing a metal plate according to [5] or [6], wherein the reduction amount of the split backup rolls is controlled based on the measured plate thickness deviation in the plate width direction.
[8] The method for producing a metal plate according to any one of [5] to [7], wherein a position corresponding to the cutting position of the metal plate by the slitter is rolled down by split backup rolls.
[9] A skin pass mill provided upstream of the slitter line;
A shape measuring device provided on at least one of the upstream side and the downstream side of the skin pass mill and measuring the plate thickness deviation in the plate width direction of the metal plate,
A camber control device that controls the amount of deflection of a work roll of a skin pass mill based on the plate width deviation of a metal plate measured by a shape measuring device.
[10] A camber control facility comprising the camber control device according to any one of [1] to [4] and the camber control device according to [9].
[11] At least one of the upstream side and the downstream side of the skin pass mill, measuring the plate thickness deviation in the plate width direction of the metal plate,
A method for manufacturing a metal plate, wherein the amount of deflection of work rolls of a skin pass mill is controlled based on the measured thickness deviation of the metal plate in the width direction.
[12] A method for producing a metal plate, comprising the method for producing a metal plate according to any one of [5] to [8] and the method for producing a metal plate according to [11].

According to the camber control device and the method for manufacturing a metal plate according to the present invention, the split backup roll is controlled based on the plate thickness deviation in the plate width direction that causes camber, or the amount of camber generated after strip cutting. By controlling the amount of reduction and correcting the shape of the metal plate, it is possible to suppress the camber that occurs when the strip is cut.

FIG. 1 is a diagram showing an outline of camber that occurs when one metal plate is divided into three. FIG. 2 is a diagram showing the relationship between the crown amount of the metal plate and the outward camber amount. FIG. 3 is a diagram showing the configuration of the camber control device according to Embodiment 1 of the present invention. FIG. 4 is a diagram showing the configuration of the leveler. FIG. 5 is a diagram showing the relative positions of the cutting positions of the metal plate and the divided backup rolls. FIG. 6 is a diagram showing the amount of camber generated in the metal plate before and after applying the camber control of the present invention. FIG. 7 is a diagram showing the configuration of a camber control device according to Embodiment 2 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

[Embodiment 1]
FIG. 1 is a diagram showing an outline of camber that occurs when one metal plate is divided into three. In this explanation, the three divided metal plates are referred to as the DR (Drive) metal plate and the CE (Center) plate.
The metal plate is called an OP (Operation) metal plate (see FIG. 1(a)).

As shown in FIG. 1(b), the camber is generated when the residual stress distributed in the metal plate is released at the time of slitting. A cross section obtained by cutting a metal plate in the width direction usually has a crown shape in which the plate thickness at the central portion is larger than that at both ends. If the metal plate has a large crown (difference between thickness at the center and thickness at both ends), when the metal plate is split in the width direction with a slitter, there will be a difference in thickness between the ends of the metal plate and the cut parts. occur.

As shown in Fig. 1(c), if the thickness difference of the metal plate after cutting (after slitting) is large, when the metal plate after slitting is rolled by the final leveler, the metal plate on the working side (OP side) is bent to the OP side, and the drive side (DR side) metal plate is bent to the DR side.

FIG. 2 is a diagram showing the relationship between the crown amount of the metal plate and the outward camber amount. The CE metal plate, which has a small thickness difference between the left and right sides, has a small outward camber amount, while the OP metal plate has a large amount of outward opening camber toward the OP side as the crown amount increases. Similarly, with the DR metal plate, the larger the amount of crown, the larger the amount of camber that opens outward toward the DR side. If the metal plate has a large crown (thickness difference between the center and the edge of the width of the plate), a thickness difference also occurs in the width direction of each metal plate after slitting.

When a metal plate having a large thickness difference in the width direction is straightened by a leveler with the same reduction amount in the width direction, a difference in elongation rate occurs in the width direction. Specifically, when the sheet thickness is thick, the sheet is rolled more and the elongation rate is large, and when the sheet thickness is thin, the sheet is not rolled and the elongation rate is small. As a result, as shown in FIG. 1, the working side (OP side) metal plate bends to the OP side, and the drive side (DR side) metal plate bends to the DR side.

FIG. 3 is a diagram showing the configuration of the camber control device according to the embodiment of the invention. The camber control device has a first profile measuring device 1, a rough leveler 2, a second profile measuring device 3, a slitter 4, a camber measuring device 5, and a final leveler 6 in order from the direction in which the metal plate flows.

As shown in FIG. 4, the rough leveler 2 is divided into two or more pieces in the axial direction of the work roll 21, and is provided with divided backup rolls 22 capable of independently controlling the reduction amount, and corrects the shape of the metal plate.

The slitter 4 is installed downstream of the rough leveler 2 and divides the metal plate into two or more pieces in the width direction. When slitting by the slitter 4, the DR (Drive) side of the metal plate before slitting and the OP
If there are defects such as edge scabs on both ends of the (Operation) side, or if the specified plate thickness cannot be secured, the DR of the metal plate before cutting is performed at the same timing as the framing material by dividing in the width direction. Both ends of the (Drive) side and OP (Operation) side can be trimmed and discarded as outside the product.

The final leveler 6 is installed downstream of the slitter 4 . Like the rough leveler 2, the final leveler 6 is divided into two or more pieces in the axial direction of the work rolls 21, and is provided with divided backup rolls 22 (see FIG. 4) capable of independently controlling the reduction amount, and is divided in the width direction. Correct the shape of the metal plate.

A camber control device according to an embodiment of the present invention includes a shape measuring device that measures at least one of the plate width deviation of a metal plate and the amount of camber generated in the metal plate. The camber control device according to the present embodiment controls the reduction amount of the split backup roll based on at least one of the plate thickness deviation and the amount of camber measured by the shape measuring device.

The shape measuring device corresponds to the first profile measuring device 1 , the second profile measuring device 3 and the camber measuring device 5 .

The first profile measuring device 1 is provided upstream of the leveler 2 to measure the plate thickness deviation (profile) in the plate width direction of the metal plate, and the measured plate thickness deviation in the plate width direction is measured by the rough leveler 2 and the final leveler 6. output to The first profile measuring device 1 can be installed on the entry side of the slitter line where the slitter 4 is provided, or can be installed upstream of the slitter line before the winding device of the hot rolling line.

The second profile measuring device 3 is provided between the leveler 2 and the slitter 4 to measure the plate thickness deviation (profile) in the plate width direction of the metal plate, and measure the plate thickness deviation in the plate width direction. and the final leveler 6.

The camber measuring device 5 is provided on the exit side of the slitter 4 , measures the amount of camber of the metal plate divided in the width direction, and outputs the measurement result to the rough leveler 2 and the final leveler 6 .

As shown in FIG. 5, the divided backup rolls 22 of the rough leveler 2 and the final leveler 6 are arranged at positions corresponding to the cutting positions (one-dot chain lines in FIG. 5) of the metal plate. is preferred. For DR (Drive) metal plate and OP (Operation) metal plate, the cut end (the center side of the metal plate before being cut) and the other end (the metal plate before being cut) Since camber occurs due to the difference in plate thickness from the end portion), by appropriately controlling the plate thickness at this cutting position with the split backup roll 22, the effect of the present invention of suppressing the occurrence of camber can be enhanced. This is because

The rough leveler 2 and the final leveler 6 measure the plate thickness of the metal plate in the plate width direction, which are input from the shape measuring device, specifically, the first profile measuring device 1, the second profile measuring device 3, and the camber measuring device 5. Roll-down control of the split backup roll 22 is performed based on at least one of the deviation and the amount of camber generated in the metal plate. Specifically, the leveler 2 performs roll-down control so as to reduce the plate thickness difference in the width direction of the metal plate after being slit by the slitter 4 .

According to the present invention, the plate thickness deviation in the plate width direction of the metal plate or the By controlling the roll-down of the divided backup rolls 22 of the rough leveler 2 and the final leveler 6 based on at least one of the camber amounts, the camber that occurs when the slitter 4 cuts the strip can be suppressed.

Specifically, in the present invention, based on the plate thickness deviation in the plate width direction of the metal plate measured by the first profile measuring device 1, by performing rolling control of the split backup roll 22 of the rough leveler 2 (feed forward ), the crown shape that causes camber can be corrected, and the camber that occurs at the time of cutting can be suppressed. Based on the thickness deviation of the metal plate in the width direction of the metal plate measured by the first profile measuring device 1, the reduction in the split backup roll 22 of the final leveler 6 is controlled (feed forward), so that the reduction in the final leveler 6 Sometimes camber promotion can be reduced.

Similarly, based on the plate thickness deviation in the plate width direction of the metal plate measured by the second profile measuring device 3, the reduction control of the split backup roll 22 of the rough leveler 2 is performed (feedback) to determine the cause of camber. It is possible to correct the crown shape and suppress the camber that occurs at the time of cutting. Based on the thickness deviation of the metal plate in the width direction of the metal plate measured by the second profile measuring device 3, the reduction in the split backup roll 22 of the final leveler 6 is controlled (feed forward), so that the reduction in the final leveler 6 Sometimes camber promotion can be reduced.

In addition, based on the amount of camber measured by the camber measuring device 5, by performing rolling control of the split backup roll 22 (feedback), the camber itself generated at the time of strip cutting is monitored and reduced. The rough leveler 2 can correct the shape. Based on the plate thickness deviation in the plate width direction of the metal plate measured by the camber measuring device 5, by performing rolling control of the split backup roll 22 of the final leveler 6 (feed forward), the camber at the time of rolling by the final leveler 6 can be reduced.

In the camber control device according to the present invention, the plate thickness deviation in the plate width direction of the metal plate, or Based on at least one of the camber amounts, the rolling control of the divided backup rolls 22 of the rough leveler 2 and the final leveler 6 is performed. The reduction amount of the split backup rolls may be controlled based on two measurement results of the thickness deviation in the plate width direction of the metal plate or the amount of camber generated in the metal plate input from 5, or all The reduction amount of the split backup roll 22 may be controlled based on the measurement result of .

In addition, the roll-down control may be performed independently for each split backup roll, or the roll-down control may be performed independently for each roll set in which two or more adjacent split backup rolls are put together.

In the above description, the rough leveler 2 and the final leveler 6 are each provided with split backup rolls 22 , but at least one of the rough leveler 2 and final leveler 6 may be provided with the split backup rolls 22 . At least one of the rough leveler 2 and the final leveler 6 controls the reduction amount of the split backup roll 22 based on the measurement results of the shape measuring devices (first profile measuring device 1, second profile measuring device 3, camber measuring device 5). , the effect of the present invention is that the amount of camber can be reduced.

Further, in FIG. 3, the measurement results of the shape measuring devices (first profile measuring device 1, second profile measuring device 3, camber measuring device 5) are shown to be directly output to the rough leveler 2 and the final leveler 6, It may be configured such that the measurement result is output to a control device (not shown), and the control device outputs the measurement result or the reduction amount of the split backup roll 22 corresponding to the measurement result as a control value.

INDUSTRIAL APPLICABILITY The present invention can be applied to a slitter line after a hot rolling process. Specifically, the present invention measures at least one of the plate thickness deviation in the plate width direction or the amount of camber generated in the metal plate, and the measured plate thickness deviation in the plate width direction or the camber generated in the metal plate Based on at least one of the amounts, it is possible to realize a method for manufacturing a steel sheet that corrects the shape of the metal sheet by independently controlling the rolling reduction amount of the divided backup roll that is divided into two or more in the axial direction of the work roll. can.

By using such a manufacturing method, it is possible to reduce the amount of camber of the manufactured metal plate, and to reduce the occurrence of operational troubles such as meandering of the metal plate during strip cutting and squeezing. In addition, it is possible to reduce dimensional accuracy defects that occur in the frame material further cut out from the stripped metal plate in the length direction and in the shape of parts after press molding the frame material, and improve the yield. .

[Embodiment 2]
FIG. 7 is a schematic diagram showing the configuration of camber control device 200 according to Embodiment 2 of the present invention. A camber control device 200 according to Embodiment 2 is applied to a production line having a skin pass mill 201 on the upstream side of a slitter line. Here, a skin pass line and a pickling line can be exemplified as a production line having a skin pass mill.

The camber control device 200 has a shape measuring device 202 upstream of the skin pass mill 201 . The shape measuring device 202 measures the plate thickness deviation in the plate width direction of the metal plate. The camber control device 200 controls the amount of deflection of the work rolls of the skin pass mill 201 based on the plate thickness deviation in the width direction of the metal plate measured by the shape measuring device 202 .

In FIG. 7, the shape measuring device 202 is provided on the upstream side of the skin pass mill 201, but the shape measuring device 202 may be provided on the downstream side of the skin pass mill 201. Both may be provided. The camber control device 200 according to the second embodiment measures the plate thickness deviation in the width direction of the metal plate measured by the shape measuring device 202 provided on at least one of the upstream side and the downstream side of the skin pass mill 201, It is sufficient if the deflection amount of the work roll is controlled.

A slitter line is provided downstream of the production line having the skin pass mill. The amount of camber generated in the slitter line increases as the plate thickness deviation in the width direction of the metal plate increases. Therefore, in Embodiment 2, in the production line preceding the slitter line, the amount of deflection of the work rolls of the skin pass mill is controlled so as to reduce the plate thickness deviation in the width direction of the metal plate. As a result, it is possible to effectively reduce the amount of camber of the metal sheet after slitting that occurs in the slitter line.

Note that the second embodiment can be implemented in combination with the first embodiment. A camber control facility having the camber control device according to the first embodiment and the camber control device according to the second embodiment may be used. In a manufacturing facility having a skin pass mill on the upstream side of the slitter line, the reduction of the skin pass mill is controlled so as to reduce the thickness deviation in the width direction of the metal plate, and the thickness deviation in the width direction of the metal plate in the slitter line. By controlling the split backup rolls to reduce the camber amount, it is possible to synergistically reduce the camber amount.

FIG. 6 is a diagram showing the amount of camber generated in the frame material before and after applying the camber control according to Embodiment 1 of the present invention. The vertical axis is the number of frames (pieces), and the horizontal axis is the amount of camber. FIG. 6(a) is a diagram showing the amount of camber before application of the present invention. The center of the horizontal axis of FIG. 6 is the metal plate with no camber (the amount of camber is zero).

FIG. 6(b) is a diagram showing the amount of camber after the application of the present invention. Specifically, the thickness deviation (profile) in the strip width direction is measured by the first profile measuring device 1 shown in FIG. The shape of the metal plate was corrected by controlling the reduction amount of each of the rolls 22 .

As a result, the amount of camber (OP bending of the OP metal plate and DR bending of the DR metal plate) is lower in FIG. 6B to which the present invention is applied than in FIG. It is understood that

1 first profile measuring device 2 rough leveler 3 second profile measuring device 4 slitter 5 camber measuring device 6 final leveler 21 work roll 22 divided backup roll 200 camber control device 201 skin pass mill 202 shape measuring device

Claims (12)

A rough leveler that corrects the shape of a metal plate,
a slitter installed downstream of the rough leveler for dividing the metal plate into two or more pieces in the width direction;
A final leveler installed on the downstream side of the slitter for correcting the shape of the metal plate split in the width direction;
A shape measuring device that measures at least one of the thickness deviation in the plate width direction of the metal plate and the amount of camber generated in the metal plate,
At least one of the rough leveler and the final leveler is divided into two or more in the axial direction of the work rolls, and has a divided backup roll capable of independently controlling the amount of reduction, and measures the plate thickness deviation and camber amount measured by the shape measuring device. A camber control device for controlling the rolling reduction amount of the split backup roll based on both . The shape measuring device is a camber measuring device that is installed downstream of the slitter and measures the amount of camber of the metal plate split in the width direction,
The camber control device according to claim 1, wherein the reduction amount of the split backup roll is controlled based on the camber amount measured by the camber measuring device. The shape measuring device is a profile measuring device that measures the plate thickness deviation in the plate width direction of the metal plate,
The camber control device according to claim 1 or 2, wherein the reduction amount of the split backup roll is controlled based on the plate thickness deviation in the plate width direction measured by the profile measuring device. The camber control device according to any one of claims 1 to 3, wherein the split backup roll is arranged at least at a position corresponding to a cutting position of the metal plate by the slitter. Measure the plate thickness deviation in the plate width direction of the metal plate and the amount of camber generated in the metal plate,
Based on both the measured plate thickness deviation in the plate width direction and the camber amount generated in the metal plate, the reduction amount of the divided backup roll divided into two or more in the axial direction of at least one of the rough leveler and the final leveler work roll. is independently controlled to correct the shape of the metal plate after slitting by a slitter . Downstream of the slitter, measure the amount of camber of the metal plate divided in the width direction,
6. The method of manufacturing a metal plate according to claim 5, wherein the reduction amount of at least one of the split backup rolls of the rough leveler and the final leveler is controlled based on the measured camber amount. Measure the strip thickness deviation in the strip width direction,
7. The method for manufacturing a metal plate according to claim 5, wherein the reduction amount of the split backup roll is controlled based on the measured plate thickness deviation in the plate width direction. 8. The method for producing a metal plate according to claim 5, wherein a position corresponding to the cutting position of the metal plate by the slitter is rolled down by a divided backup roll. a skin pass mill provided upstream of the slitter line;
A shape measuring device provided on at least one of the upstream side and the downstream side of the skin pass mill and measuring the plate thickness deviation in the plate width direction of the metal plate,
A camber control device that controls the amount of deflection of a work roll of a skin pass mill based on the plate width deviation of a metal plate measured by a shape measuring device. a first camber control device, which is the camber control device according to any one of claims 1 to 4;
a skin pass mill provided upstream of the slitter line;
A shape measuring device provided on at least one of the upstream side and the downstream side of the skin pass mill and measuring the plate thickness deviation in the plate width direction of the metal plate,
and a second camber control device for controlling the amount of deflection of the work rolls of the skin pass mill based on the plate width deviation of the metal plate measured by the shape measuring device. At least one of the upstream side and the downstream side of the skin pass mill, measuring the plate thickness deviation in the plate width direction of the metal plate,
A method for manufacturing a metal plate, wherein the amount of deflection of work rolls of a skin pass mill is controlled based on the measured thickness deviation of the metal plate in the width direction. A method for producing a first metal plate, which is the method for producing a metal plate according to any one of claims 5 to 8;
At least one of the upstream side and the downstream side of the skin pass mill, measuring the plate thickness deviation in the plate width direction of the metal plate,
and a second method for manufacturing a metal sheet, wherein the amount of deflection of a work roll of a skin pass mill is controlled based on the measured thickness deviation of the metal sheet in the width direction.

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