JP2719210B2 - Tuning control method of shape control end in sheet rolling - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the tuning of a shape operating end in rolling a steel plate or other metal plate.

[Prior Art] One of the qualities of a steel plate or a rolled metal plate used for a vehicle, a home electric appliance or the like is a plate shape, a plate crown and an edge drop.

Recently, the demands of users for plate shapes and the like have become more severe, and therefore, various rolling methods or rolling mills capable of controlling the plate shape, plate crown or edge drop have been developed. As one of them, a rolling mill that gives offset and horizontal deflection to a small-diameter work roll is known. (See "Japan Plastic Working II", Japan Plastic Working Association, August 14, 1986). In this rolling mill, the work roll is elastically deformed into a required shape by adjusting the vertical and horizontal roll bending forces, thereby obtaining a desired plate shape, plate crown or edge drop. By giving an offset to the work roll, horizontal roll deflection is likely to occur.

[Problems to be Solved by the Invention] In the above-mentioned rolling mill for imparting a horizontal deflection to the offset work roll, the horizontal roll bending force (horizontal roll deflection) of the roll or the horizontal roll bending force depends on the rolling conditions or plate shape during rolling. The magnitude of the roll offset amount may be left-right asymmetric with respect to the center of the rolling mill. In such a case, a thrust force is generated in the roll, and the thrust force accelerates the wear of the thrust bearing. further,
When the thrust force increases and exceeds the bearing strength, the bearing is damaged and the rolling mill fails.

Therefore, the present invention seeks to provide a tuning control method of a shape operating end capable of preventing occurrence of a roll thrust force in plate rolling in which a horizontal roll bending force is applied to a horizontally offset roll to control the shape. Is what you do.

[Means for Solving the Problems] The tuning control method of the present invention is directed to a plate rolling for controlling a plate shape by applying a horizontal roll bending force to at least one roll that is offset in the horizontal direction to control the plate shape. The horizontal roll bending force and the roll offset amount are detected on the drive side. Then, based on the detection result, the horizontal roll bending force and the roll offset amount are adjusted so that the horizontal roll bending force and the roll offset amount on both sides are equal.

As the horizontal roll bender, for example, a known roll bender that applies a horizontal roll bending force by a hydraulic cylinder connected to a roll shaft portion is used. To detect the magnitude of the horizontal roll bending force, a hydraulic pressure of a hydraulic cylinder or a load cell provided on a roll shaft or a cylinder rod is used. As the roll offset adjusting device, for example, a device including a wedge slidably inserted between a housing and a bearing box and a hydraulic cylinder for putting the wedge in and out is used. The roll offset adjusting device can adjust the roll offset amount even during rolling. In order to detect the magnitude of the roll offset amount, the displacement of the roll, the wedge or the cylinder rod is detected by an operating transformer, a potentiometer, a magnetic scale, or the like.

Note that, in addition to the horizontal roll bender and the roll offset adjusting device, a vertical roll bender, a work roll shift device, and the like are used for the shape control operation end. The horizontal roll bender and the roll offset adjusting device may be provided on either the work roll or the intermediate roll.
It is preferable to provide both.

[Operation] Since the horizontal roll bending force and the roll offset amount are equal on the work side and the drive side, the horizontal deflection of the roll is substantially symmetric with respect to the center of the rolling mill. As a result, the component of the rolling reaction force acting on the roll in the sheet width direction cancels out on the left and right sides, and the thrust force becomes almost zero.

[Embodiment] FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a plan view of a six-high rolling mill including a block diagram of a control system, and FIG. 2 is a side view of the rolling mill. FIG.

The upper and lower work rolls 3 are provided with bearing housings 4 at the roll shafts.
It is supported by. The hydraulic cylinder 6 of the vertical roll bender 5 is connected to the bearing housing 4. The vertical roll bender 5 applies a vertical bending force to the work roll 3.

The intermediate roll 7 is supported by a bearing housing 11. Bearing housing 11
Is a self-aligning bearing comprising a convex spherical inner ring 12 and a concave spherical seat 13. By supporting the roll shaft portion 8 with the self-aligning bearing, when a bending force is applied to the intermediate roll 7, the roll shaft portion 8 is freely deformed and concentration of stress is avoided. A hydraulic cylinder 16 of a horizontal roll bender 15 is connected to a portion of the intermediate roll 7 near the shaft end of the roll shaft portion 8. Also, a bearing box of the housing 1 and the intermediate roll 7
The wedge 19 of the roll offset adjusting device 18 is slidably inserted between the roll offset adjusting device 18 and the hydraulic cylinder 20 of the roll offset adjusting device 18. The hydraulic cylinders 20 work together so that when one wedge 19 moves forward, the other wedge 19 moves backward by the same distance. The intermediate roll 7 is supported by a backup roll 9.

The control device for the horizontal roll bending force includes horizontal roll bending force detectors 24 arranged on the work side and the drive side, respectively. The horizontal roll bending force detector 24 includes a pressure sensor provided on the hydraulic cylinder 16 of the horizontal roll bender 15. The signal from the horizontal roll bending force detector 24 is
The signal is amplified and A / D converted in the signal processing circuit 23 and input to the tuning control operation circuit 21. A target value is previously input to the tuning control arithmetic circuit 21 from the setting circuit 22 and is set. By the signal from the tuning control arithmetic circuit 22,
The controller 25 outputs an operation signal to the horizontal roll bender 15.

Similarly, the roll offset amount control device includes roll offset amount detectors 34 disposed on the work side and the drive side, and on the entrance side and the exit side of the rolling mill, respectively. The roll offset amount detector 34 is constituted by a displacement sensor connected to the rod of the hydraulic cylinder 20 of the roll offset amount adjusting device 18. The signal from the roll offset amount detector 34 is input to the tuning control operation circuit 31 via the signal processing circuit 33. In the tuning control operation circuit 31, a target value from the setting circuit 32 is set in advance. Based on the control deviation from the tuning control arithmetic circuit 31, the controller 35 sends the operation signal to the roll offset amount adjusting device 18
Output to

In the six-high rolling mill configured as described above, the magnitude of the vertical bending force acting on the work roll 3, the magnitude of the horizontal bending force acting on the intermediate roll 7, and the roll offset amount, the sheet shape, the sheet crown and The relationship with the edge drop amount has been experimentally obtained for the actual machine in advance, and is stored as a calculation table in a rolling control computer (not shown). When a sheet size, a rolling amount, other rolling conditions, a target sheet shape and a sheet crown are input to a rolling control computer, a vertical bending force is applied to the work roll 3. The horizontal roll bending force is applied to the intermediate roll 7 so as to be convexly curved toward the rolling mill exit side, and is offset to the rolling mill exit side. During rolling, the strip shape and strip crown of the strip rolled on the exit side of the rolling mill are detected. Based on the detection result, the magnitude of the vertical bending force of the work roll 3 and the horizontal bending force of the intermediate roll 7 and the roll offset amount are adjusted, and the plate shape and the plate crown are feedback-controlled.

During rolling, the horizontal roll bending force and the roll offset amount are detected on the work side and the drive side, respectively. Then, the detection result is input to the tuning control operation circuits 21 and 31, where the control deviation is calculated. The control deviation is output to the controllers 25 and 35, and the horizontal roll bender 15 and the roll offset adjusting device 18 are controlled by operation signals from the controllers 25 and 35.
Since the target value is set to the same value on both the work side and the drive side, by setting the control deviation to zero, the horizontal roll bending force and the roll offset amount on both sides become equal to each other.

Here, a specific example in which a steel sheet is rolled by the above-described six-high rolling mill will be described.

Rolling machine configuration Work roll: Roll diameter 550mm, Roll copper length 1820mm Intermediate roll: Roll diameter 400mm, Roll copper length 1820mm Roll offset amount 0-40mm, Horizontal bending force ± 40TON Roll crown 0.16mm parabolic crown Backup roll: Roll diameter 1420mm , Roll copper length 1820mm Rolled sheet Material: ordinary steel Sheet thickness: 2.7mm 0.6mm Sheet width: 1500mm Rolling conditions Rolling rate: 30% Rolling speed: 1500m / min The vertical bending force of the work roll and the intermediate roll by the above rolling mill As a result of controlling the horizontal bending force and the roll offset amount, the plate shape could be changed by about 4% in the middle elongation and the end elongation change Δλ (change in steepness), and a good plate shape could be obtained. During rolling, the magnitudes of these were controlled so that the horizontal roll bending force and the roll offset amount were equal on the work side and the drive side. As a result, only a thrust force that did not cause a problem in the rolling operation was generated. On the other hand, when the horizontal roll bending force and the roll offset amount were not adjusted so as to be equal, a thrust force of several to tens of tons was generated in the roll.

The present invention is not limited to the above embodiment. For example, the rolling mill may be a quadruple rolling mill and a work roll provided with a horizontal roll bender and a roll offset adjusting device.

[Effects of the Invention] In the present invention, since the magnitudes of the horizontal roll bending force and the roll offset amount are controlled so as to be equal on the work side and the drive side during rolling, almost no roll slide occurs. As a result, wear and breakage of the thrust bearing are prevented, and rolling can be stably performed.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a plan view of a six-rolling mill including a block diagram of a control system, and FIG. 2 is a side view of the rolling mill. is there. 1 ... housing, 3 ... work roll, 7 ... intermediate roll, 9 ... backup roll, 11 ... bearing box, 15 ...
… Horizontal roll bender, 16 …… hydraulic cylinder, 18 ……
Roll offset adjusting device, 19: Wedge, 20: Hydraulic cylinder, 21, 31: Tuning control operation circuit, 22, 32 ...
Setting circuit, 23, 33 Signal processing circuit, 24 Horizontal roll bending force detector, 25, 35 Controller, 34
... Roll offset amount detector.

Continuation of the front page (72) Inventor Matsuo Ataka 1-1-1 Edamitsu, Yawatahigashi-ku, Kitakyushu-shi, Fukuoka Prefecture Nippon Steel Corporation 3rd Technical Research Institute (56) References JP-A-58-116916 (JP, A) JP-A-61-103610 (JP, A) JP-A-62-238014 (JP, A)

Claims (1)

(57) [Claims] In a plate rolling for controlling a plate shape by applying a horizontal roll bending force to at least one roll offset in the horizontal direction, a horizontal roll bending force and a roll offset amount on a work side and a drive side are controlled. Detecting and adjusting the horizontal roll bending force and the roll offset amount so that the horizontal roll bending force and the roll offset amount on both sides are equal based on the detection result. Control method.