JP6370266B2 - Rolling system, rolling method and control device - Google Patents

Description

  Embodiments described herein relate generally to a rolling system, a rolling method, and a control device.

  The vertical warp that occurs in the material to be rolled during rolling of the metal plate material contributes to lowering the productivity of the metal plate material, such as a reduction in rolling efficiency and an increase in processes for correcting the warp. When a metal plate material with vertical warpage is caught in a rolling mill, it may cause a great deal of damage such as breakage of the rolling facility or production stoppage due to collision with the rolling facility or poor biting of the rolling mill.

  The vertical warpage generated in the material to be rolled during rolling of the metal plate material is as follows: (1) Vertical difference of friction coefficient between work roll and rolled material, (2) Temperature difference of rolled material, (3) Work roll peripheral speed This is caused by the vertical asymmetry of the material to be rolled, such as vertical difference.

  For example, in Patent Document 1, the amount of vertical warpage at least at the tip of a material to be rolled is detected by a warp sensor installed on at least one side of the rolling mill, and the amount of vertical warpage is set to zero. A rolling control method for calculating the temperature difference between the upper and lower surfaces of a rolled material is disclosed. In this method, the non-rolled material is set to have a calculated upper and lower surface temperature difference.

  Further, for example, Patent Document 2 discloses a method for controlling warpage of a material to be rolled when rolling is performed with a pair of work rolls that are rotationally driven by different drive sources. In this control method, the speed of the one side surface and the speed of the other side surface of the material to be rolled immediately after being rolled into the rolling mill are continuously monitored, and the speed of the one side surface and the speed of the other side surface are The rotation control of the pair of work rolls is performed based on the speed difference between the two.

  For example, Patent Document 3 discloses a rolling method in which a rolling mill having at least an upper and lower work roll and an upper and lower work roll is prepared, and a predetermined offset amount with respect to the upper and lower work roll is set in the upper and lower work roll. . In this rolling method, the rolling direction force acting on the work roll chock of either the upper work roll or the lower work roll, and the rolling load are detected, the offset component force is calculated from the rolling load and a predetermined offset amount, and rolling A difference value between the directional force and the offset component force is calculated, and control is performed to eliminate the difference value. As a specific object for controlling the difference value, it is disclosed to control at least one selected from the temperature difference between the upper and lower surfaces of the non-rolled material and the incident angle of the plate to the rolling mill.

  However, in the control methods described in Patent Literature 1 and Patent Literature 2, the control from the tip of the material to be rolled to the warpage sensor is performed for correcting the warpage so as to be a reference value for feedback control. I can't. Therefore, the material to be rolled enters the next rolling process in a state where the warp is generated at the tip. Therefore, the biting position of the material to be rolled with respect to the rolling mill at the next stage is not appropriate, and it is not possible to prevent great damage such as a breakage of the rolling equipment or a production stop due to a collision with the rolling equipment or a bad biting of the rolling mill.

  Also in the rolling method described in Patent Document 3, vertical warping occurs in the time until the vertical warpage of the material to be rolled is controlled by operating the upper and lower surface asymmetric elements, and the next stage warpage is caused by the generated warpage of the tip. It may occur that the biting position of the rolling mill is shifted. Therefore, it is the same as the other methods that it is impossible to prevent a great deal of damage such as a collision with the rolling equipment due to the warping of the tip, a breakage of the rolling equipment due to a biting failure of the rolling mill, or a production stop.

JP 63-63510 A JP 2003-285111 A International Publication No. 2010/016216

  Embodiments include a rolling system, a rolling method, and a control device that correct the vertical position of the tip of a material to be rolled that has been warped up and down in a first rolling stand so that the second rolling stand can accurately bite it. provide.

  The rolling system according to the embodiment includes a first rolling stand that rolls the material to be rolled, a second rolling stand that is provided separately from the first rolling stand, and further rolls the material to be rolled, and the first rolling. A warp detector that is provided between the stand and the second rolling stand and detects a warp amount of the material to be rolled; and the occurrence of the warp detector in relation to a separation distance between the first rolling stand and the second rolling stand. A control device that calculates a deflection amount of the material to be rolled, and generates a control signal for correcting a vertical position of the tip of the material to be rolled in the second rolling stand based on the amount of warpage and the amount of deflection; And a correction device that corrects the position in the vertical direction based on the control signal.

In the present embodiment, a control signal for correcting the vertical position of the tip of the material to be rolled in the second rolling stand based on the amount of warpage of the material to be rolled and the amount of deflection of the material to be rolled detected by the warp detector . Since the control device for generating and the correction device for correcting the vertical position of the tip of the material to be rolled based on the generated control signal are provided, the vertical position of the tip of the material to be rolled is corrected. It is possible to match the biting position of the second rolling system.

1 is a block diagram illustrating a rolling system according to a first embodiment. FIG. 2A and FIG. 2B are schematic views for explaining the state of warpage and deflection of the material to be rolled. It is an example of the flowchart for demonstrating operation | movement of the rolling system of 1st Embodiment. It is a block diagram which illustrates the rolling system which concerns on the modification of 1st Embodiment. It is a block diagram which illustrates the rolling system concerning a 2nd embodiment. It is a block diagram which illustrates the rolling system concerning a 3rd embodiment. It is a block diagram which illustrates the rolling system concerning a 4th embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the size ratio between the parts, and the like are not necessarily the same as actual ones. Further, even when the same part is represented, the dimensions and ratios may be represented differently depending on the drawings.
In the present specification and drawings, the same elements as those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

(First embodiment)
FIG. 1 is a block diagram illustrating a rolling system according to this embodiment.
FIG. 2A and FIG. 2B are schematic views for explaining the state of warpage and deflection of the material to be rolled.
FIG. 3 is an example of a flowchart for explaining the operation of the rolling system of the present embodiment.
The structure of the rolling system 100 of this embodiment is demonstrated. As shown in FIG. 1, the rolling system 100 of the present embodiment includes two rolling stands 10 and 20, warpage detectors 30 a and 30 b, electric motor driving devices 40 a and 40 b, electric motors 42 a and 42 b, and a rolling control device. 50.

  The first rolling stand 10 includes work rolls 12a and 12b and backup rolls 14a and 14b. The rotation axes of the work rolls 12a and 12b are arranged so as to be substantially parallel to the reference plane. The reference surface is, for example, the flat floor surface 5 of the plant where the rolling system 100 is installed. The work rolls 12a and 12b are arranged so that their rotation axes are substantially parallel to each other, and their closest outer circumferences are arranged apart from each other by a substantially constant distance along the direction of the rotation axis. The separation distance of the outer periphery is a roll gap that bites the material 1 to be rolled. The work rolls 12a and 12b roll the material to be rolled 1 by biting the material to be rolled 1 into the roll gap while maintaining an appropriately set roll gap.

  The backup roll 14a is disposed above the upper work roll 12a and in contact with the outer periphery of the work roll 12a. The backup roll 14b is disposed below the lower work roll 12b and in contact with the outer periphery of the work roll 12b. The backup rolls 14a and 14b are supplementarily provided so that the work rolls 12a and 12b can secure an appropriate amount of reduction with respect to the material 1 to be rolled and maintain a set roll gap.

  Although not shown, the work rolls 12a and 12b and the backup rolls 14a and 14b are each supported by a roll chock. The roll chock is supported by a frame having sufficient strength and is fixed to the floor surface 5.

  The work rolls 12a and 12b and the backup rolls 14a and 14b are driven to rotate by an electric motor or the like. The upper work roll 12a and the backup roll 14a are rotationally driven in cooperation. The lower work roll 12b and the backup roll 14b are rotationally driven in cooperation. Therefore, in order to facilitate understanding, the following description will be made assuming that the targets of the rotational drive are the work rolls 12a and 12b.

  The second rolling stand 20 includes work rolls 22a and 22b and backup rolls 24a and 24b. The work rolls 22a and 22b and the backup rolls 24a and 24b are arranged in the same manner as the work rolls 12a and 12b and the backup rolls 14a and 14b of the first rolling stand 10. The second rolling stand 20 is disposed in front of the material to be rolled 1 in the rolling direction. That is, the material 1 to be rolled is rolled on the first rolling stand 10 and then rolled on the second rolling stand 20. In general, the roll gap of the second rolling stand 20 is set to be narrower than the roll gap of the first rolling stand 10, and the material 1 rolled by the first rolling stand 10 is 2 is further rolled thinly. The lower side of the roll gap of the first rolling stand 10, that is, the upper end of the lower work roll 12b, and the lower side of the roll gap of the second rolling stand, that is, the upper end of the lower work roll 22b are in the same plane. The 1st rolling stand 10 and the 2nd rolling stand 20 are arrange | positioned so that it may become.

For convenience of explanation, the following coordinates will be used for explanation.
It is assumed that the x-axis extends parallel to the floor surface 5 on which the rolling system 100 is installed. The x-axis includes the upper end of the lower work roll 12b of the first rolling stand 10 and the upper end of the lower work roll 22b of the second rolling stand 20. The origin of the x axis is assumed to be the upper end of the work roll 12b. Further, the x-axis extends so as to be orthogonal to the rotation axes of the work rolls 12a and 12b.

  An axis extending perpendicularly to the x-axis and extending in the vertical direction and passing through the center of the rotation axis of the work roll 12b on the lower side of the first rolling stand 10 is defined as a y-axis. The origin of the y axis is assumed to be the upper end of the work roll 12b. In this example, the centers of the rotation axes of the upper work roll 12a and the backup rolls 14a and 14b are all on the y axis, but they are not necessarily required to be on the y axis. For example, the center of the rotation axis of at least one of the backup rolls 14a and 14b may be shifted in the x-axis direction from the center of the rotation axis of the work rolls 12a and 12b.

  The distance between the first rolling stand 10 and the second rolling stand 20 in the x-axis direction is defined as an inter-stand distance L. More specifically, the x coordinate at the inter-stand distance L is assumed to coincide with the coordinate on the x axis of the upper end of the work roll 22b on the lower side of the second rolling stand 20. In other words, the distance between the upper end position of the lower work roll 12b of the first rolling stand 10 and the upper end position of the lower work roll 22b of the second rolling stand 20 is the inter-stand distance L. As will be described later, since the position in the y-axis direction of the tip 1a of the material to be rolled 1 is corrected when biting into the roll gap formed by the work rolls 22a and 22b, the y coordinate of the upper end of the work roll 22b is , Not necessarily equal to 0.

  The material 1 to be rolled proceeds along the x-axis. The material 1 to be rolled is rolled by the first rolling stand 10, rolled by the first rolling stand 10, and further rolled by the second rolling stand 20. The first rolling stand 10 and the second rolling stand 20 are arranged so that the material 1 to be rolled advances in the positive direction of the x-axis, and the material 1 to be rolled is sequentially bitten into the respective roll gaps.

  The warp detectors 30 a and 30 b are provided on the exit side of the first rolling stand 10. The upper warp detector 30a is disposed on the positive side of the y-axis and measures the displacement of the upper surface of the material 1 to be rolled that passes through the roll gap. The lower warp detector 30b is disposed on the negative side of the y-axis and measures the displacement of the lower surface of the material 1 to be rolled that passes through the roll gap. The warpage detectors 30 a and 30 b measure and output the amount of warpage in the upward and downward directions of the material 1 to be rolled, and supply the rolling control device 50 with the measurement. The warp detectors 30a and 30b are, for example, laser displacement meters. In addition, the exit side of the rolling stands 10 and 20 is a side where the material 1 is rolled and discharged. Moreover, the entrance side of the rolling stands 10 and 20 is a side from which the material 1 to be rolled enters the roll gap.

  The electric motor driving devices 40a and 40b are connected to the electric motors 42a and 42b, and drive the electric motors 42a and 42b. The motor drive devices 40a and 40b control the peripheral speeds of the upper and lower work rolls 12a and 12b by the motors 42a and 42b in accordance with the speed reference signal supplied from the rolling control device 50. The electric motor drive devices 40a and 40b can drive the upper and lower work rolls 12a and 12b independently of each other together with the electric motors 42a and 42b. The motor drive devices 40a and 40b are power conversion devices such as inverter devices, for example, and the motors 42a and 42b are synchronous motors or the like.

  The rolling control device 50 is connected to the outputs of the warp detectors 30a and 30b. The rolling control device 50 is connected to the inputs of the electric motor driving devices 40a and 40b, and supplies a speed reference signal to the electric motor driving devices 40a and 40b. The rolling control device 50 includes a correction calculation unit 52 and a storage unit 54. A signal related to the amount of warpage in the upper or lower direction of the material to be rolled 1 from the warp detectors 30a and 30b is input to the correction calculation unit 52. Data relating to the inter-stand distance L stored in advance in the storage unit 54 is read into the correction calculation unit 52. The correction calculation unit 52 calculates the warp amount y1 of the tip 1a of the material 1 to be rolled based on the measurement results of the warp detectors 30a and 30b, and is applied to the material 1 to be rolled behind the position x1 where the warp amount is measured. Thus, the amount of warpage that offsets the warpage is calculated. The value of the warping amount y1 of the tip portion of the material 1 to be rolled is stored in the storage unit 54 by the correction calculation unit 52. The correction calculation unit 52 calculates the deflection amount yd of the material 1 to be rolled at the inter-stand distance L based on a predetermined calculation formula, and stores the value in the storage unit 54. The correction calculation unit 52 reads the value of the warp amount y1 and the value of the deflection amount yd, and calculates the coordinates (L, y2) of the tip of the material 1 to be rolled in the second rolling stand 20 based on these values. To do. Further, the correction calculation unit 52 cancels the position in the y-axis direction based on the coordinates (L, y2) of the tip, that is, generates a warp amount having a direction and magnitude so as to make it zero. Is generated and supplied to the motor drive devices 40a and 40b. That is, the motor drive devices 40a and 40b and the motors 42a and 42b are correction devices that are supplied with the speed reference signal from the rolling control device 50 and correct the coordinates (L, y2) of the tip 1a of the material 1 to be rolled.

Operation | movement of the rolling system 100 of this embodiment is demonstrated.
As shown in FIG. 2 (a), the material 1 to be rolled is rolled by a first rolling stand 10, and when the material 1 to be rolled is discharged from the first rolling stand 10, at least the tip 1 a is either up or down. Cause warping in one direction. In the example shown in the figure, warping occurs in the upward direction, that is, the positive direction of the y axis. The warping amount y1 is a positive value. The material 1 to be rolled may be warped downward, and the warpage amount y1 is a negative value.

  If the warpage is not corrected after the material to be rolled 1 is discharged from the first rolling stand 10, the amount of warpage at the tip 1a gradually increases as the rolled material 1 progresses as the broken line in the figure shows. To do. In the rolling system 100 of the present embodiment, warpage detectors 30a and 30b are provided on the exit side of the first rolling stand 10 at a distance x1 (x coordinate is x1) that is sufficiently shorter than the distance L between the stands. The warpage detectors 30a and 30b detect the amount of warpage y1 from the tip 1a of the material 1 to be rolled to the position x1. The rolling control device 50 cancels the warpage with respect to the material 1 to be rolled from the position x1 based on the detected amount of warpage y1 and the difference in the peripheral speeds of the upper and lower work rolls 12a, 12b at that time. The peripheral speed difference between the work rolls 12a and 12b is set. The rolling control device 50 generates a speed reference signal for the electric motor driving devices 40a and 40b based on the peripheral speed difference between the work rolls 12a and 12b, and drives the electric motors 42a and 42b to correct the warpage. Accordingly, rolling proceeds with the warpage corrected from the distance 1 from the tip 1a of the material 1 to be rolled. That is, at the coordinates (L, 0), that is, at the position where the second rolling stand 20 is engaged, as shown by the one-dot chain line in the figure, the material 1 to be rolled is the y-axis by the amount of warping y1 from the tip 1a to the position x1. It is displaced in the direction. At this time, the deflection due to the weight of the material 1 to be rolled is ignored.

  As shown in FIG. 2B, apart from the warp of the material to be rolled 1, the material to be rolled 1 is not yet rolled until the material to be rolled 1 reaches the second rolling stand 20 from the first rolling stand 10. Therefore, the material to be rolled 1 bends in the negative direction of the y-axis due to its own weight. When the displacement of the tip 1a of the material 1 to be rolled at this time is defined as a deflection amount yd, the absolute value | yd | of the deflection amount yd can be approximated to the displacement of the tip of a cantilever having a length L. The absolute value | yd | of the deflection amount can be calculated by the following equation (1).

| Yd | = (ω × L ⁴ ) / (8 × EI) (1)

  Here, ω is the equally distributed load of the material 1 to be rolled, and EI is the bending rigidity of the material 1 to be rolled. The equally distributed load ω and the bending rigidity EI are physical quantities that can be set in advance depending on the material, cross-sectional dimensions, and the like of the material 1 to be rolled. The inter-stand distance L is set in advance by the arrangement of the first rolling stand 10 and the second rolling stand 20.

  In addition, by approximating the material 1 to be rolled to a cantilever beam supported by the first rolling stand 10, the deflection amount yd is calculated using Equation (1), but using other models. It goes without saying. For example, the cross-sectional shape of the material 1 to be rolled that has passed through the first rolling stand 10 may be measured, and the amount of deflection may be calculated by numerical analysis.

  The correction calculation unit 52 is arranged such that the tip 1a of the material 1 to be rolled coincides with the biting position of the second rolling stand 20, that is, the position of the tip 1a of the material 1 to be rolled is coordinates (L, 0). Set to be.

  More specifically, when the warp correction is not performed, the position of the tip 1a of the material 1 to be rolled is y1 + yd = y2 when x = L. The amount of warp y1 can be positive or negative. The deflection amount yd is a negative value. In the rolling system 100, when x = L, the correction calculation unit 52 calculates the difference between the peripheral speeds of the work rolls 12a and 12b by the correction calculation unit 52 so as to generate a warp of “−y2”. A speed reference signal is generated based on the difference in peripheral speed. In accordance with the speed reference signal appropriately generated in this way, the motor driving devices 40a and 40b drive the motors 42a and 42b.

  For example, the warp amount y1 of the tip 1a of the material 1 to be rolled is a positive value (that is, the warp in the upward direction), and the absolute value thereof is the absolute value | yd | of the deflection amount of the material 1 to be rolled at the position L. Is larger, the position of the tip 1a of the material 1 to be rolled at the position L becomes a positive value. In order to correct this, it is necessary to generate a negative warp. A downward warping can be generated by setting the peripheral speed (or rotational speed or rotational speed) of the upper motor 42a to be larger than the peripheral speed of the lower motor 42b.

  When the warp amount y1 of the tip 1a of the material 1 to be rolled is a positive value and the absolute value is smaller than the absolute value | yd | of the deflection amount, the position of the tip 1a of the material 1 to be rolled at the position L Is a negative value. In order to correct this, it is necessary to generate a warp of a positive value. By setting the peripheral speed of the lower motor 42b larger than the peripheral speed of the upper motor 42a, an upward warp can be generated.

  When the amount of warp y1 of the tip 1a of the rolled material is a negative value (that is, a downward warp), the warp for correction needs to be a positive value.

  In some cases, a looper is installed between the first rolling stand 10 and the second rolling stand 20 to control the tension of the material 1 to be rolled. When the looper is provided in this way, the material to be rolled 1 is limited in the deflection amount yd ′ between the first rolling stand 10 and the second rolling stand 20 at the position of the looper in the y-axis direction. Will be. In the example of FIG. 2B, it is assumed that the looper is at the position of coordinates (L ′, y3). y3 is a negative value (y3 <0). As shown by the two-dot chain line in FIG. 2B, when the material 1 is supported by the looper at the coordinates (L ′, y3), the position of the tip 1a is further from the y coordinate y3 of the looper. The position is lowered by the deflection. The displacement Δyd due to the deflection from the looper position can be obtained by replacing L with (L−L ′) in equation (1). Therefore, the total deflection amount yd 'at x = L can be obtained by the following equation (2).

yd ′ = y3 + Δyd
= Y3 + {ω × (L−L ′) ⁴ } / (8 × EI) (2)

The operation of the rolling system 100 of this embodiment will be described with reference to a flowchart.
As shown in FIG. 3, in the rolling system 100, in step S1, the warp detectors 30a and 30b measure the warp amount y1 between the tip 1a of the material 1 to be rolled and the position x1.

  In step S2, the correction calculation unit 52 calculates the correction amount of the warp after the position x1, and supplies the speed reference signal generated based on the calculated correction amount to the motor drive devices 40a and 40b.

  In step S <b> 3, the correction calculation unit 52 stores the value of the warpage amount y <b> 1 from the tip 1 a to the position x <b> 1 calculated in step S <b> 2 in the storage unit 54.

  In step S <b> 4, the correction calculation unit 52 calculates the deflection amount yd of Expression (1), and the calculated value of the deflection amount yd is stored in the storage unit 54.

  In step S5, the correction calculation unit 52 calculates the y-coordinate y2 = y1 + yd of the tip 1a at x = L, and generates a speed reference signal that has a warp amount of -y2, and supplies it to the motor drive devices 40a and 40b. The

  In step S6, the rotational speed control is executed by the electric motor drive devices 40a and 40b so that the amount of warpage is −y2.

The operation and effect of the rolling system 100 of this embodiment will be described.
In the rolling system 100 of the present embodiment, the warp of the material to be rolled 1 is detected by the warp detectors 30a and 30b arranged at appropriate positions x1 on the exit side of the first rolling stand 10, and the tip of the material 1 to be rolled is detected. Since the warp generated from 1a to the position x1 is corrected when biting into the second rolling stand 20, the vertical warp of the tip 1a of the material 1 to be rolled, which cannot be corrected by feedback control, can be corrected. . Further, in the rolling control device 50, the correction calculation unit 52 can calculate the amount of deflection yd due to the weight of the material 1 to be rolled, and corrects the position of the tip 1a of the material 1 to be rolled including this amount of deflection. be able to. Accordingly, the tip 1a of the material 1 to be rolled can be accurately bitten into the roll gap of the second rolling stand 20, so that it is possible to reduce biting defects and the like, and the operation of the plant is more stable. Can be made.

(Modification of the first embodiment)
In order to detect the curvature of the material 1 to be rolled, it can be performed by measuring the speed difference between the upper and lower surfaces of the material 1 to be rolled. In the rolling system 100a of this embodiment, speed detectors 32a and 32b are used.

FIG. 4 is a block diagram illustrating a rolling system 100a of this modification.
The rolling system 100a of this modification includes speed detectors 32a and 32b instead of the warp detectors 30a and 30b of the rolling system 100 of the first embodiment. The rolling control device 50a of the rolling system 100a is the same as the rolling control device 50 of the first embodiment except that the signals from the speed detectors 32a and 32b are input and the amount of warpage is calculated. About another component, it is the same as the rolling system 100 of 1st Embodiment, attaches | subjects the same code | symbol and abbreviate | omits description.
As shown in FIG. 4, the rolling system 100a includes two rolling stands 10 and 20, speed detectors 32a and 32b, electric motor driving devices 40a and 40b, electric motors 42a and 42b, and a rolling control device 50a. Prepare.

  The speed detectors 32a and 32b are, for example, laser Doppler velocimeters. The laser Doppler velocimeter measures the transport speed of the material 1 to be rolled by measuring the difference in wavelength between the transmitted laser light and the reflected light reflected from the material 1 being conveyed.

The operation and effect of the rolling system 100a of this modification will be described.
In the rolling system 100a of the present embodiment, the speeds of the upper and lower surfaces of the material to be rolled 1 are measured using the speed detectors 32a and 32b, and the warpage amount of the material to be rolled 1 is calculated from the speed difference. Therefore, the measurement result of the warpage amount can be performed more accurately, and the result of the correction calculation is also made accurate. Therefore, a more stable rolling process can be realized.

  In addition to the warp detectors 30a and 30b, the speed detectors 32a and 32b can be used for measuring the warp of the material 1 to be rolled, and more accurate warpage can be measured. In all the embodiments described below, the warp detectors 30a and 30b or the speed detectors 32a and 32b can be used, and the warp detectors 30a and 30b and the speed detectors 32a and 32b can be used together. .

(Second Embodiment)
In the rolling system 100, 100a of the above-described embodiment, the warpage of the material to be rolled 1 is corrected by controlling the difference between the peripheral speeds of the work rolls 12a, 12b, but the warpage is corrected by other means. be able to. In the rolling system 100b of this embodiment, the curvature of the material 1 to be rolled is corrected by appropriately setting the temperature difference between the upper and lower surfaces of the material 1 to be rolled.

FIG. 5 is a block diagram illustrating a rolling system 100b of this embodiment.
The structure of the rolling system 100b of this embodiment is demonstrated.
As shown in FIG. 5, the rolling system 100b of this embodiment includes two rolling stands 10, 20, warp detectors 30a, 30b, injection driving devices 60a, 60b, injection nozzles 62a, 62b, and temperature detection. Devices 64a and 64b and a rolling control device 50b. In the rolling system 100b of the present embodiment, instead of the electric motor driving devices 40a and 40b and the electric motors 42a and 42b, the first and the second are provided with injection driving devices 60a and 60b, injection nozzles 62a and 62b, and temperature detectors 64a and 64b. It differs from the rolling system 100, 100a of the second embodiment. Moreover, in the rolling system 100b of this embodiment, the rolling control apparatus 50b is also different from the rolling systems 100 and 100a in that the injection driving apparatuses 60a and 60b are controlled. In the following description, the same components are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

  The injection drive devices 60a and 60b are connected to the output of the rolling control device 50b, respectively. Outputs of the jet driving devices 60a and 60b are connected to jet nozzles 62a and 62b.

  The injection nozzle 62a is provided above the material 1 to be rolled, that is, at a position where y> 0, and the opening of the nozzle is directed to the upper surface of the material 1 to be rolled. The injection nozzle 62b is provided below the material 1 to be rolled, that is, at a position where y <0, and the opening of the nozzle is directed to the lower surface of the material 1 to be rolled. The injection nozzles 62 a and 62 b are provided on the entry side of the first rolling stand 10. The injection nozzles 62a and 62b are connected to a pipe (not shown) and inject water supplied through the pipe onto the upper surface and the lower surface of the material 1 to be rolled. For the injection nozzles 62a and 62b, the opening and closing of the valve is controlled by an actuator, for example, and water is discharged with a set injection amount. The injection nozzles 62a and 62b are controlled to open and close the valve in accordance with a control signal from the rolling control device 50b to control the amount of water injection. The medium sprayed onto the material 1 to be rolled is only required to be able to adjust the temperature of the upper surface and the lower surface of the material 1 to be rolled, and may be a cooling liquid or gas other than water.

  The temperature detector 64a is provided on the same side as the injection nozzle 62a and detects the temperature of the upper surface of the material 1 to be rolled. The temperature detector 64b is provided on the same side as the injection nozzle 62b and detects the temperature of the lower surface of the material 1 to be rolled.

  Water is sprayed onto the upper and lower surfaces of the material 1 to be rolled by the injection nozzles 62a and 62b, and the temperatures of the upper and lower surfaces of the material 1 to be rolled are detected by the temperature detectors 64a and 64b. Information on the temperature of the upper and lower surfaces of the material to be rolled 1 is fed back.

  The rolling control device 50 b includes a correction calculation unit 52 b and a storage unit 54. The outputs of the warp detectors 30a and 30b are connected to the correction calculation unit 52b, and the outputs of the temperature detectors 64a and 64b are connected. The correction calculation unit 52b generates drive signals for the injection drive devices 60a and 60b based on the warp amounts and temperatures of the upper and lower surfaces of the material 1 to be rolled, which are detected by the warp detectors 30a and 30b and the temperature detectors 64a and 64b. Set to control the amount of water sprayed from the spray nozzles 62a, 62b. That is, the injection control devices 60a and 60b and the injection nozzles 62a and 62b control the temperature on the upper and lower surfaces of the material 1 to be rolled by supplying a control signal from the rolling control device 50b, thereby correcting the warp of the material 1 to be rolled. It is a correction device.

Operation | movement of the rolling system 100b of this embodiment is demonstrated.
In the rolling system 100b of this embodiment, the amount of warpage of the material 1 to be rolled at the position x1 is detected by the warp detectors 30a and 30b, as in the rolling system 100 of the first embodiment. The detected amount of warpage is input to the rolling control device 50b.

  The rolling control device 50b adjusts the temperatures of the upper surface and the lower surface of the material to be rolled 1 so as to cancel out the amount of warpage of the material 1 to be rolled from the tip 1a to the position x1. Since the material 1 to be rolled is a metal, the degree of expansion varies depending on the temperature. When water is sprayed on one surface and the temperature of that surface decreases, the degree of expansion of that surface also decreases. For example, when the warp of the material 1 to be rolled occurs in the positive direction of the y-axis, the warp that cancels out the warp in the positive direction is set by setting the lower surface temperature lower than the upper surface temperature. Can be generated, and the occurrence of warpage can be offset.

  In a state where the occurrence of warpage is offset, the material to be rolled 1 is rolled by the first rolling stand 10 and heads toward the second rolling stand 20.

  The rolling control device 50b is configured such that when the tip 1a of the material to be rolled 1 reaches the position where the second rolling stand 20 is engaged, that is, when x = L, y = 0 is satisfied. 60b is driven. Here, the rolling control device 50b sets a driving signal for the injection driving devices 60a and 60b, including that the position of the tip 1a in the y-axis direction is lowered due to the bending of the material 1 to be rolled. Assuming that the amount of warpage y1 at the position x1 from the tip 1a of the material 1 to be rolled and the amount of deflection yd of the tip 1a, the position y2 of the tip 1a in the y-axis direction at x = L is y2 = y1 + yd. Controls the injection driving devices 60a and 60b so that -y2 when x = L.

The operation and effect of the rolling system 100b of this embodiment will be described.
The rolling system 100b according to the present embodiment includes the injection driving devices 60a and 60b, the injection nozzles 62a and 62b, and the temperature detectors 64a and 64b.

  As described above, the vertical curvature of the material 1 to be rolled is not only caused by the difference in the peripheral speed (or rotation speed, rotation speed) of the upper and lower work rolls, but also caused by the temperature difference between the upper and lower surfaces of the material 1 to be rolled. To do. When warping has occurred due to a temperature difference between the upper and lower surfaces of the material 1 to be rolled, in order to eliminate the warping, the temperatures of the upper and lower surfaces of the material 1 to be rolled are set so as to offset the warping that has occurred. There is a need. In the rolling system 100b of the present embodiment, since the injection drive devices 60a and 60b, the injection nozzles 62a and 62b, and the temperature detectors 64a and 64b are provided, water is generated according to the direction and amount of warpage. The injection amount can be set appropriately. Therefore, even if the cause of warpage is due to the temperature difference between the upper and lower surfaces of the material 1 to be rolled, the y coordinate of the tip 1a can be set to 0 at the position where the second rolling stand 20 is engaged. Since the tip 1a of the material 1 to be rolled can be accurately bitten into the roll gap of the second rolling stand 20, it becomes possible to reduce biting defects and the like, and realize stable operation of the plant. be able to.

(Third embodiment)
By appropriately setting the friction coefficients of the upper and lower surfaces of the material 1 to be rolled, the amount of warpage can be set and the generated warpage can be offset.
FIG. 6 is a block diagram illustrating a rolling system 100c of this embodiment.
The structure of the rolling system 100c of this embodiment is demonstrated.
As shown in FIG. 6, the rolling system 100c of the present embodiment includes two rolling stands 10, 20, warp detectors 30a, 30b, injection driving devices 61a, 61b, injection nozzles 63a, 63b, and rolling control. And a device 50c. The rolling system 100c of the present embodiment includes oil injection nozzles 63a and 63b instead of the water injection nozzles 62a and 62b, and the injection driving devices 61a and 61b drive the oil injection nozzles 63a and 63b. This is different from the rolling system 100b of the third embodiment. The rolling control device 50c also differs from the rolling system 100b in that it controls the jet driving devices 61a and 61b that drive the oil jet nozzles 63a and 63b. In the following, the same constituent elements are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

  The injection nozzles 63a and 63b inject oil supplied through a pipe (not shown) onto the upper and lower surfaces of the material 1 to be rolled. For the injection nozzles 63a and 63b, the opening and closing of the valves is controlled by an actuator, for example. The injection nozzles 63a and 63b release oil at a set injection amount. The rolling control device 50 c includes a correction calculation unit 52 c and a storage unit 54. The injection nozzles 63a and 63b are driven by the injection driving devices 61a and 61b controlled by the control signal generated by the correction calculation unit 52c, and the oil injection amount is appropriately set. That is, the injection control devices 61a and 61b and the injection nozzles 63a and 63b control the friction coefficient of the upper and lower surfaces of the material to be rolled 1 by supplying a control signal from the rolling control device 50c, thereby correcting the warp of the material 1 to be rolled. It is a correction device to do. In addition, the medium injected to the rolling material 1 should just be able to adjust the friction coefficient of the upper surface and lower surface of the to-be-rolled material 1, and may be other liquids and gas other than oil.

Operation | movement of the rolling system 100c of this embodiment is demonstrated.
In the rolling system 100c of this embodiment, the amount of warpage of the material 1 to be rolled at the position x1 is detected by the warp detectors 30a and 30b. The detected amount of warpage is input to the correction calculation unit 52c of the rolling control device 50c.

  The correction calculation unit 52c injects an appropriate amount of oil onto the upper surface and the lower surface of the material to be rolled 1 by the injection driving devices 61a and 61b so as to cancel out the warpage amount of the material to be rolled 1 at the position x1. In the material 1 to be rolled, the coefficient of friction with the work rolls 12a and 12b is controlled by the sprayed surface oil. For example, when the material to be rolled 1 is warped upward, that is, in the direction of y> 0, it is considered that the friction coefficient on the upper surface side of the material 1 is larger than the friction coefficient on the lower surface side. It is done. Therefore, the rolling control device 50c controls the jet driving devices 61a and 61b so as to decrease the friction coefficient on the upper surface side and increase the friction coefficient on the lower surface side. That is, the rolling control device 50c sets the oil injection amount on the upper surface side to be larger than the oil injection amount on the lower surface side.

  After adjusting the oil injection amount so as to offset the warp of the tip 1a of the material 1 to be rolled at the position x1, the rolling control device 50c is configured as x in the same manner as the rolling systems 100 to 100b of the other embodiments described above. The position y2 in the y-axis direction of the tip 1a at = L is set so as to include 0, including the deflection amount yd.

The operation and effect of the rolling system 100c of this embodiment will be described.
Since the rolling system 100c of this embodiment includes the injection driving devices 61a and 61b and the injection nozzles 63a and 63b, the following operations and effects are produced.
The cause of the occurrence of warpage in the rolling system may be due to the difference in the peripheral speed between the upper and lower work rolls, the temperature difference between the upper and lower surfaces of the material to be rolled, and the difference in the friction coefficient between the upper and lower surfaces of the material to be rolled. When the material to be rolled is warped due to the difference in friction coefficient between the upper and lower surfaces of the material to be rolled, it is necessary to control the occurrence of the warp of the material to be rolled by setting an appropriate friction coefficient. In the rolling system 100c of this embodiment, since the injection nozzles 63a and 63b for injecting oil and the injection drive devices 61a and 61b for driving these are provided, the oil to be injected to the upper surface and the lower surface of the material 1 to be rolled, respectively. Can be set appropriately. Therefore, in the rolling system 100c, even when warping occurs due to the difference in friction coefficient between the upper and lower surfaces of the material 1 to be rolled, the warping is appropriately corrected when the second rolling stand 20 is bitten. be able to.

(Fourth embodiment)
By setting the angle at which the tip 1a of the material 1 to be rolled bites into the first rolling stand 10, that is, the incident angle θ of biting with respect to the x-axis, the occurrence of warpage can be offset.
FIG. 7 is a block diagram illustrating a rolling system 100d of this embodiment.
The structure of the rolling system 100d of this embodiment is demonstrated.
As shown in FIG. 7, the rolling system 100d of this embodiment includes two rolling stands 10, 20, warp detectors 30a, 30b, a vertically movable table roller 70, a table roller height position moving device 72, A rolling control device 50d. The rolling system 100d of this embodiment is different from the rolling systems 100 to 100c of the other embodiments described above in that it includes a vertically movable table roller 70 and a table roller height position moving device 72. The rolling system 100d of the present embodiment is also different from the rolling systems 100 to 100c in that the rolling control device 50d controls the table roller height position moving device 72. In the following description, the same components are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

  The vertically movable table roller 70 includes a plurality of table rollers 71a and a support member 71b. The plurality of table rollers 71a respectively rotate around a rotation axis provided substantially parallel to a direction perpendicular to the x-axis and the y-axis. The table roller 71a is arranged so that the lower surface of the material to be rolled 1 is in contact with the upper end of the table roller 71a. Therefore, the table roller 71a rotates with the conveyance of the material 1 to be rolled. The table roller 71a is supported by a support member 71b. The support member 71b can be moved along the y-axis by the table roller height position moving device 72. That is, the plurality of table rollers 71a supported by the support member 71b move up and down while contacting the lower surface of the material 1 to be rolled. The vertically movable table roller 70 is disposed on the entry side of the first rolling stand 10. When the vertically movable table roller 70 is vertically moved, the y-axis position of the biting into the first rolling stand 10 and the y-axis position of the material 1 to be rolled placed on the table roller 71a Can be changed relatively. Incidence of the biting of the material to be rolled 1 into the first rolling stand 10 by relatively changing the biting position in the y-axis direction and the position in the y-axis direction of the material 1 to be rolled on the table roller 71a. The angle θ can be changed.

  The table roller height position moving device 72 is connected to the output of the rolling control device 50d. The table roller height position moving device 72 includes a driving device that moves the vertically movable table roller 70 in the vertical direction. The rolling control device 50d includes a correction calculation unit 52d and a storage unit 54. The table roller height position moving device 72 sets the position of the vertically movable table roller 70 in the y-axis direction according to the control signal generated by the correction calculation unit 52d of the rolling control device 50d, and moves it to that position. That is, the table roller 70 and the table roller height position moving device 72 control the height of the material to be rolled into the first rolling stand 10 by supplying a control signal from the rolling control device 50d, and the material to be rolled. This is a correction device that corrects the warp of the material 1 to be rolled by setting an incident angle θ to one first rolling stand 10.

Operation | movement of the rolling system 100d of this embodiment is demonstrated.
The vertically movable table roller 70 of the rolling system 100d of this embodiment moves up and down along the y axis. When the upper end of the table roller 71a coincides with the position of y = 0, the lower surface of the material 1 to be rolled coincides with the position of y = 0. When the position of the vertically movable table roller 70 in the y-axis direction moves in the negative direction, the upper end of the table roller 71a moves in the negative direction of the y-axis. In such a state, when the material 1 to be rolled is placed on the table roller 71a, and the material 1 to be rolled is caught in the roll gap and conveyed, the lower surface of the material 1 to be rolled is An angle θ is formed. That is, the material 1 to be rolled is bitten with respect to the first rolling stand 10 at an incident angle of θ. Although not shown in the drawing, when the vertically movable table roller 70 moves in the positive direction of the y-axis, the upper end of the table roller 71a moves in the positive direction of the y-axis. When the material 1 to be rolled is conveyed toward the first rolling stand 10 on the table roller 71a, it is bitten with an angle having a sign opposite to that in the above case.

  When the centers of the rotation axes of the work rolls 12a and 12b coincide with each other at x = 0, when the rolled material 1 enters the roll gap at an angle θ with respect to the x axis, the rolled material 1 is y Since the component force in the axial direction is received, warping occurs in a direction corresponding to the component force. Also, when the center of the rotation axis of the work rolls 12a and 12b is deviated from x = 0, a component force is generated along the y axis. In the rolling system 100d, the position of the up and down movable table roller 70 in the y-axis direction is set so as to cancel the mechanical component force, and the incident angle of the material 1 to be rolled. Can be set.

  Similar to the rolling systems 100 to 100c of other embodiments, the warp of the tip 1a of the material 1 to be rolled is measured by the warp detectors 30a and 30b, and a component force in the y-axis direction is generated so as to cancel this. The position of the up and down movable table roller 70 in the y-axis direction is set. For example, when the tip 1a is warped upward, the position of the vertically movable table roller 70 in the y-axis direction is moved upward in order to generate a downward component force. When the warp of the tip 1a is downward, the position of the vertically movable table roller 70 in the y-axis direction is moved downward to generate an upward component force.

  When the tip 1a of the material 1 to be rolled reaches x = L, the correction calculation unit 52d calculates the amount of warpage y1 generated from the tip 1a to x1 and the amount of displacement yd generated by the deflection of the material 1 to be rolled. The position of the vertically movable table roller 70 in the y-axis direction is moved so as to generate a warp in the reverse direction so as to cancel the sum.

The operation and effect of the rolling system 100d of this embodiment will be described.
Since the rolling system 100d of this embodiment includes the vertically movable table roller 70 and the table roller height position moving device 72, the following operations and effects are produced.
In the rolling system 100d of this embodiment, the incident angle of the material to be rolled 1 with respect to the roll gap can be set by the vertically movable table roller 70 and the table roller height position moving device 72. Therefore, the amount of warpage for offsetting the deflection of the material 1 to be rolled is controlled while offsetting the occurrence of warpage due to the component force in the y-axis direction during rolling of the material 1 to be rolled due to the eccentricity of the work rolls 12a, 12b and the like. be able to. Therefore, the operational stability of the rolling plant can be improved.

  As described above, the warpage in the vertical direction of the material to be rolled 1 is the difference in peripheral speed between the work rolls 12a and 12b, the temperature difference between the upper and lower surfaces of the material 1 to be rolled, the friction coefficient difference between the upper and lower surfaces, and the work rolls 12a and 12b. Generation of component force due to eccentricity or the like may occur in a complex manner. In the rolling systems 100 to 100d of the first to fourth embodiments described above, the rolling system may be configured by combining a plurality of embodiments without being limited to the case of realizing each of the components. For example, by adding injection drive devices 60a and 60b to the rolling system 100 of the first embodiment, the temperature of the upper and lower surfaces of the material to be rolled 1 in addition to the correction of the peripheral speed difference between the work rolls 12a and 12b. The amount of warpage of the material to be rolled 1 can be controlled by controlling the difference.

  According to the embodiment described above, rolling that can correct the tip of the material to be rolled so that the material to be rolled 1 that has warped up and down at the first rolling stand can be accurately bitten into the second rolling system. A system, a rolling method and a control device can be realized.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalents thereof. Further, the above-described embodiments can be implemented in combination with each other.

1 Roll material, 5 Floor, 10, 20 Rolling stand, 12a, 12b, 22a, 22b Work roll, 14a, 14b, 24a, 24b Backup roll, 30a, 30b Warp detector, 32a, 32b Speed detector, 40a , 40b Electric motor drive device, 42a, 42b Electric motor, 50-50d Rolling control device, 60a, 60b, 61a, 61b Injection drive device, 62a, 62b, 63a, 63b Injection nozzle, 64a, 64b Temperature detector, 70 Vertical movable table Roller, 71a table roller, 71b support member, 72 table roller height position moving device, 100-100d rolling system

Claims (8)

A first rolling stand for rolling the material to be rolled;
A second rolling stand provided apart from the first rolling stand and further rolling the material to be rolled;
A warp detector that is provided between the first rolling stand and the second rolling stand and detects a warping amount of the material to be rolled;
A deflection amount of the material to be rolled that occurs in relation to a separation distance between the first rolling stand and the second rolling stand is calculated, and based on the warpage amount and the deflection amount, the coverage in the second rolling stand is calculated. A control device for generating a control signal for correcting the vertical position of the tip of the rolled material;
A correction device that corrects the vertical position based on the control signal;
With rolling system. The first rolling stand has work rolls provided vertically.
The rolling system according to claim 1, wherein the correction device includes a driving device that controls each peripheral speed of the work roll based on the control signal. Further comprising a temperature detector for measuring the temperature of the upper surface and the lower surface of the material to be rolled,
The control device generates a control signal for correcting the position in the vertical direction based on the warpage amount, the deflection amount, and the temperatures of the upper surface and the lower surface,
The correction device, based on the control signal, based on the output of the injection control device for controlling the injection amount of each of the fluid injected to the upper surface and the lower surface of the material to be rolled, The rolling system according to claim 1, further comprising: an injection nozzle that injects the fluid onto the upper surface and the lower surface of the material to be rolled. The correction device controls an injection amount of each of the fluids injected to the upper surface and the lower surface of the material to be rolled based on the control signal, and the fluid based on the output of the injection control device. and wherein the nozzle elevation injection you injected into the upper surface and said lower surface,
The rolling system according to claim 1, wherein the fluid includes a fluid that reduces a coefficient of friction between the upper surface and the lower surface.   The correction device is provided on the entrance side of the first rolling stand, and moves in a direction including a vertical direction. Based on the control signal, the correction device moves the table roller in a direction including the vertical direction. The rolling system according to claim 1, comprising: an apparatus. Rolling system according to the warp detector, said by measuring the difference in velocity along the upper and lower surfaces of the rolling direction of the rolled material, any one of the preceding claims for measuring the amount of warpage. By the warp detector provided on the exit side of the first rolling stand, the amount of warpage of the material to be rolled output from the first rolling stand is detected,
By the control device, the amount of deflection of the material to be rolled in the second rolling stand disposed at a predetermined distance from the first rolling stand is calculated,
By the control device, based on the amount of warpage of the material to be rolled and the amount of deflection, a control signal for correcting the vertical position of the tip of the material to be rolled in the second rolling stand is generated ,
A rolling method in which the position in the vertical direction is corrected by a correction device based on the control signal. In the outlet side of the first rolling stand, the warp amount detected by the warp detector for detecting the vertical direction of the warp of the rolled material, and a second rolling which is provided to be separated a predetermined distance from the first rolling stand The control apparatus which produces | generates the control signal which correct | amends the position of the vertical direction of the front-end | tip of the said rolling material in a said 2nd rolling stand based on the amount of deflections of the said rolling material in the stand in the vertical direction.

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