JPH08238512A - Method for suppressing vibration of material to be rolled and device therefor - Google Patents

Abstract

PURPOSE: To suppress chattering of a material to be rolled by suppressing tension variation of the material to be rolled which is traveled between rolling mills between the rolling mills and preventing the tension variation to be transmitted from one rolling mill to the other. CONSTITUTION: The vibration suppressing device 15 is provided with a control roll 9 for supporting the material 4 to be rolled with is traveled between the rolling mills 1 and for controlling the tension of this material 4 to be rolled. The control roll 9 is supported on a load cell 20 and this load cell 20 is driven with an actuator 11. Tension applied o the material 4 to be rolled is controlled and the vibration of the material 4 to be rolled is suppressed by driving the actuator 11 and changing the pressing force with the control roll 9 so as to offset the variation of tension detected with the load cell 20 with a controlled 12. In this way, the chattering which is transmitted between the rolling mills 1 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for suppressing vibration of a material to be rolled which is traveling between rolling mills under tension, and more particularly to vibration generated when the material to be rolled is rolled at a high speed. The present invention relates to a vibration suppressing method and a vibration suppressing device for suppressing (chattering).

[0002]

2. Description of the Related Art In one rolling mill, a large reduction force is applied to a pair of work rolls via a backup roll provided behind each work roll, and a large rolling force is applied between the pair of work rolls. The rolled material is rolled by bringing the rolled material into contact with each other. A plurality of such rolling mills are provided along the traveling direction of the material to be rolled. Then, the material to be rolled is rolled by each rolling mill to be successively thinned. The material to be rolled between the above rolling mills is
Alternatively, it is stretched by pressing rolls provided between rolling mills and runs between the rolling mills under a predetermined tension. In such a rolling mill, when the rolling speed (traveling speed of the material to be rolled) is increased to some extent, as shown in FIG.
Longitudinal vibration of Hz is generated, causing a strip thickness defect on the rolled material.
Therefore, if such chattering occurs,
If it is left as it is, the rolling speed will have to be reduced, which will incur operational disadvantages. Therefore, it is necessary to suppress the vibration without reducing the rolling speed.

[0003]

By the way, it has been reported by Sakurai et al. That chattering of a material to be rolled traveling between rolling mills is caused by a change in tension applied to the material to be rolled (Sakurai et al. , “Vibration Analysis of Chattering Phenomenon during Sheet Rolling”, Japan Society of Mechanical Engineers, Proc. Of Mechanical Dynamics and Measurement and Control (Vol.B, p.281), 199.
1). In addition, the chattering of the material to be rolled does not occur only due to the operating conditions between certain rolling mills, but is propagated to a plurality of rolling mills sequentially through the tension fluctuation of the material to be rolled, It occurs in the material to be rolled across the series of rolling mills. However, even with such knowledge, a useful method for suppressing chattering occurring in the material to be rolled between rolling mills as described above has not been found. Therefore, an object of the present invention is to suppress the tension fluctuation of the material to be rolled running between certain rolling mills between the rolling mills and prevent the tension fluctuation from being transmitted from one rolling mill to the other rolling mill. Accordingly, it is an object of the present invention to provide a vibration suppressing method and a vibration suppressing device for a rolled material capable of suppressing chattering of the rolled material.

[0004]

In order to achieve the above-mentioned object, the main means adopted by the first invention is the gist of the invention, namely the material to be rolled which runs between the rolling mills under tension. In the above vibration suppression method, a control roll for controlling the tension of the material to be rolled is provided between the rolling mills, the variation amount of the tension applied to the material to be rolled between the rolling mills is detected, and the variation of the detected tension is detected. The amount of tension fluctuation compensation that cancels out the amount is calculated, and the pressing force of the control roll on the material to be rolled between the rolling mills is changed according to the calculated amount of tension fluctuation compensation, whereby the material to be rolled is changed. It is configured as a vibration suppressing method for a material to be rolled, which is characterized by controlling tension applied to the material. In order to achieve the above-mentioned object, the second invention is a vibration suppression device for a rolled material that travels between rolling mills in a tensioned state. A control roll for controlling the tension, a tension fluctuation amount detecting means for detecting the fluctuation amount of the tension applied to the material to be rolled between the rolling mills, and a tension fluctuation compensation amount for canceling the detected fluctuation amount of the tension. Compensation amount calculating means for controlling the rolling amount of the rolling material by changing the pressing force of the control roll against the rolling material between the rolling mills according to the calculated fluctuation compensation amount of the tension. It is configured as a vibration suppressing device for a material to be rolled, comprising a tension control means for controlling tension.

[0005]

In the method for suppressing vibration of a material to be rolled according to the present invention, first, the variation amount of the tension applied to the material to be rolled between the rolling mills is detected, and then the tension variation for canceling the detected variation amount of the tension is detected. The fluctuation compensation amount is calculated. Then, the tension applied to the material to be rolled between the rolling mills is controlled by changing the pressing force to the material to be rolled by using the control roll according to the calculated tension fluctuation compensation amount. Therefore, the vibration of the material to be rolled at this portion is suppressed, so that the transmission of chattering from one rolling mill to the other rolling mill is prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and are not intended to limit the technical scope of the present invention. FIG. 1 is a block diagram showing a schematic side cross section of one rolling mill according to an embodiment of the present invention, and FIG. 2 is a state explanation showing a state of rolled material sequentially rolled by two rolling mills. 3 and 4 are schematic diagrams showing a schematic configuration of a vibration suppressing device for suppressing the vibration of the material to be rolled between the rolling mills, and FIG. 4 is a diagram showing a fixed roll, a control roll and one rolling mill arranged between the rolling mills. FIG. 5 is an explanatory view showing respective positional relationships of work rolls, FIG. 5 is a graph showing a simulation result of vibration of a material to be rolled suppressed by the vibration suppressing device, and FIG. 6 is a schematic configuration showing a modification of the vibration suppressing device. It is a figure.

As shown in FIG. 1, a rolling mill 1 according to this embodiment has a pair of work rolls 10 for rolling and rolling a material 4 to be rolled, and a pair of work rolls 10 behind the work rolls 10. It is mainly composed of a pair of backup rolls 2 arranged in contact with each other to apply a rolling force in the direction of the material to be rolled 4 to each work roll 10, and a housing 3 for accommodating them. Further, the rolling mill 1 is provided with a reduction cylinder 5 for applying a reduction force applied to the material to be rolled 4 to the backup roll 2, and a load cell 6 for detecting the reduction force applied to the material to be rolled. As shown in FIG. 2, a plurality of such rolling mills 1 are arranged at regular intervals along the running direction of the material 4 to be rolled. Below the material to be rolled between the rolling mills 1, the rolling mills 1
Fixed roll 8 which is arranged at a fixed position with respect to the installation position and which supports the traveling rolling material 4 rotatably at that position, and a tension measuring roll for detecting the tension of the traveling rolling material 4. 7 and a control roll 9 for controlling the tension of the material 4 to be rolled, and a vibration for maintaining the tension of the material 4 to be rolled by controlling the pressing force applied to the material 4 by the control roll 9. A suppression device 15 is provided.

In the vibration suppressing device 15, as shown in FIG. 3, a control roll 9 for pressing the material 4 to be rolled is rotatably supported by the load cell 20. Further, the control roll 9 and the load cell 20 are supported by the driving end of the actuator 11. Therefore, the pressing force F applied to the material 4 to be rolled by the control roll 9 is detected by the load cell 20, and the detected pressing force F is input to the control device 12. The actuator 11 is driven based on the output signal from the control device 12 to move the control roll 9 up and down. Therefore, the principle of keeping the tension of the rolled material 4 constant by the control roll 9 of the vibration suppressing device 15 will be described below with reference to FIG. It is assumed that the fixed rolls 8, the control rolls 9 and the work rolls 10 of the rolling mill 1 on the right side are in the positions shown in FIG. At this time, the distance L of the material to be rolled 4 from the fixed roll 8 to the work roll 10 is expressed by the following equation (1). L = L ₁ ′ + L ₂ ′ = √ (L ₁ ² + h ² ) + √ (L ₂ ² + h ² ) ... (1)

At this time, when the pressing force of the control roll 9 detected by the load cell 20 fluctuates from F to F + ΔF, the fluctuation amount ΔT of the tension applied to the material to be rolled 4 between the rolling mills 1 is ( It changes as shown in the equation (2). ΔT = ΔF / (h / L ₁ ′ + h / L ₂ ′) (2) On the other hand, from the lines L ₁ and L ₂ connecting the fixed roll 8 and the work roll 10 to the control roll 9 The distance h of
By varying the minute amount Δh by operating the actuator 11, the variation amount ΔT ₁ of the tension applied to the material 4 to be rolled between the rolling mills ₁ is as shown in equation (3). ΔT ₁ = (EAh / L ₁ ′ L ₂ ′) Δh (3) where E: longitudinal elastic modulus A: cross-sectional area perpendicular to the running direction of the material 4 to be rolled. Calculates the fluctuation amount ΔT of the tension applied to the material 4 to be rolled from the expression (2) based on the amount of change ΔF of the pressing force to the material 4 to be rolled detected by the load cell 20. That is, the load cell 20 and the control device 1
Reference numeral 2 is an example of a tension fluctuation amount detecting means for detecting the fluctuation amount of the tension applied to the material to be rolled between the rolling mills.

Then, the amount of fluctuation of the tension of the rolled material 4 Δ
In order to cancel T, the tension fluctuation amount ΔT ₁ in equation (3) that cancels the value of the fluctuation amount ΔT may be calculated. That is, the controller 12 that calculates the tension fluctuation compensation amount ΔT ₁ that cancels the tension fluctuation amount ΔT by using the equation (3).
Is an example of the compensation amount calculation means. Therefore, when the pressing force detected by the load cell 20 fluctuates by ΔF, the movement amount Δh of the actuator for suppressing the tension change of the material to be rolled 4 caused by this is expressed by the equations (2) and (3). Can be obtained from the following equation (4). Δh = (− 1 / (EA (L ₁ ′ + L ₂ ′))) (L ₁ ′ L ₂ ′ / h) ² × ΔF (4) Thus, the pressing force applied to the rolled material 4 The driving amount Δh of the actuator is calculated on the basis of the variation ΔF and the actuator 11 is operated based on the calculated driving amount Δh to control the tension applied to the rolled material 4. That is, the control device 12 that controls the tension applied to the material to be rolled by changing the pressing force F applied to the material to be rolled 4 by the control roll 9 is an example of the tension control means.

The chattering in the material 4 to be rolled between the rolling mills 1 as described above occurs near 100 Hz. When the actuator 11 is driven, it is necessary to drive it in consideration of the control delay generated in each part of the control roll 9, the load cell 20, and the actuator 11. Therefore, the control device 12 is configured to be able to perform more stable control without the above-mentioned control delay by performing differential compensation control in addition to proportional compensation control. As described above, according to the present embodiment, the material 4 to be rolled between the rolling mills ₁ is adjusted according to the variation compensation amount ΔT ₁ that cancels the variation ΔT of the tension applied to the material 4 to be rolled.
Since the tension applied to the rolled material 4 is controlled by changing the pressing force F applied to the rolled material 4 by using the control roll 9, the fluctuation of the tension of the rolled material 4 is suppressed. As a result, chattering of the rolled material 4 is suppressed at the position of the control roll 9, as shown in FIG. As a result, other rolling mills 1
The propagation of chattering to the material 4 to be rolled during the interval can be cut off at the position of the control roll 9.

In the structure shown in FIG. 2, the load cell 20 is eliminated and the control roll 9 is directly rotatably supported by the drive end of the actuator 11 to be used in the control device 12. It is also possible to use the output from the tension measuring roll 7 as the variation amount ΔT of the tension of the material 4. Further, as shown in FIG. 6, the tension measuring roll 7 the function of the control roll 9 shown in FIG. 2 _a
By providing the, it can also be used to suppress vibration suppressing device 15 _a variation of the tension of the material to be rolled 4 This tension measuring roll 7 _a. Further, in the controller 12, the tension applied to the rolled material 4 is controlled by the proportional compensation control and the differential compensation control, but the control gain used at that time is not necessarily fixed. Instead, the optimum gain according to the change of the entire system constituted by each rolling mill 1 and the rolled material 4 etc. is calculated at any time, and the tension applied to the rolled material 4 is controlled using this gain. Good.

[0013]

According to the present invention, in a method for suppressing vibration of a material to be rolled which travels between the rolling mills under tension, a control roll for controlling the tension of the material to be rolled is provided between the rolling mills. The amount of fluctuation of the tension applied to the material to be rolled between the rolling mills is detected, and the amount of fluctuation compensation of the tension that cancels the detected amount of fluctuation of the tension is calculated. Accordingly, a method for suppressing vibration of a material to be rolled is provided, in which a tension applied to the material to be rolled is controlled by changing a pressing force applied to the material to be rolled between the rolling mills by the control roll. . Thereby, the tension fluctuation of the material to be rolled running between the rolling mills changes the pressing force of the control roll to the material to be rolled,
It is suppressed between the rolling mills. Therefore, it is possible to prevent the change in tension of the material to be rolled from being transmitted from one rolling mill to the other rolling mill. As a result, chattering of the rolled material propagating from the rolling mill to the rolling mill can be suppressed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a schematic side section of a rolling mill according to an embodiment of the present invention.

FIG. 2 is a state explanatory view showing a state of a material to be rolled which is sequentially rolled by two rolling mills.

FIG. 3 is a configuration diagram showing a schematic configuration of a vibration suppressing device that suppresses vibration of a material to be rolled between the rolling mills.

FIG. 4 is an explanatory view showing a positional relationship of each of a fixed roll, a control roll and a work roll of one of the rolling mills arranged between the rolling mills.

FIG. 5 is a graph showing a simulation result of vibration of the material to be rolled suppressed by the vibration suppressing device.

FIG. 6 is a schematic configuration diagram showing a modified example of the vibration suppressing device.

FIG. 7 is a graph showing chattering of a material to be rolled which is caused by a tension variation in the material to be rolled between conventional rolling mills.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rolling mill 4 ... Rolled material 7, 7 _a ... Tension measuring roll 9 ... Control roll 10 ... Work roll 11 ... Actuator 12 ... Control device 15, 15 _a ... Vibration suppressor 20 ... Load cell

Claims (2)

[Claims] 1. A method for suppressing vibration of a material to be rolled, which travels between rolling mills in a tensioned state, wherein a control roll for controlling the tension of the material to be rolled is provided between the rolling mills. The amount of change in tension applied to the material to be rolled is detected, the amount of change in tension compensation that cancels out the amount of change in tension detected is calculated, and the amount of change in tension between the rolling mills is calculated according to the calculated amount of change in tension compensation. The method for suppressing vibration of a material to be rolled is characterized by controlling the tension applied to the material to be rolled by changing the pressing force applied to the material to be rolled by the control roll. 2. A vibration suppressing device for a rolling material that travels between rolling mills in a tensioned state, and a control roll arranged between the rolling mills to control the tension of the rolling material,
A tension fluctuation amount detecting means for detecting a fluctuation amount of tension applied to a material to be rolled between the rolling mills, and a compensation amount calculating means for calculating a tension fluctuation compensation amount for canceling the detected fluctuation amount of tension. And a tension control means for controlling the tension applied to the material to be rolled by changing the pressing force of the control roll on the material to be rolled between the rolling mills according to the calculated fluctuation compensation amount of tension. A vibration suppressing device for a material to be rolled, comprising: