JPH02268913A - Rolling mill equipped with device for absorbing variation of tension on inlet side - Google Patents

Abstract

PURPOSE:To control the variation of tension of a strip on the inlet side with a high responsiveness by moving the positions of deflector rolls guided through a die means based on information about the thickness of the strip on the inlet side of main rolling rolls. CONSTITUTION:The passing locus of the strip A uncoiled from an uncoiling reel 20 is bent by the deflector rolls 13, then, the strip A is rolled by the main rolling rolls 24. The control means anticipates the variation of tension based on information regarding the thickness of the strip A brought into the main rolling rolls 24, the deflector rolls 13 are guided by a guide means according to this variation of tension and moved to a prescribed position. Since the variation of tension of the strip on the inlet side of the rolling rolls can be absorbed by the movement of the deflector rolls 13 with a high responsiveness and at a high speed, the thickness of the rolled sheet material can be controlled with a high accuracy while the rolling speed is held at a high speed and the productivity is kept at a high grade.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to cold rolling mills for steel and non-ferrous metals, and in particular to an inlet tension variation suitable for use in plate thickness control technology in high-speed rolling of thin plates in one stand. The present invention relates to a rolling mill equipped with an absorption device.

[Prior Art] FIG. 4 is a schematic diagram showing a conventional aluminum strip cold rolling mill. On the downstream side of the rewinding reel 20 on which the coil B of the strip A is attached, there is an entry side deflector roll 2.
1, an inlet thickness deviation gauge 22, a mill guide 23, a rolling main body roll 24, an outlet thickness deviation gauge 25, an outlet deflector roll 26, and a take-up reel 27 are provided. Also, A.G.
C (automatic plate thickness control) control device 30 stores the input side strip speed detected from the rotation speed of the input side deflector roll 21 and the plate thickness deviation value from a predetermined plate thickness detected by the input side plate thickness deviation meter 22, The timing at which this position reaches the rolling body roll 24 is predicted. Further, a deviation signal from a predetermined plate thickness detected by the exit plate thickness deviation meter 25 and an actual rolling load value from a rolling pressure detection load cell 33 are input to the AGC control device 30. Based on these detection results, the AGC control device 30 controls the hydraulic servo device 31.
The hydraulic servo device outputs a control signal to and drives the hydraulic rolling device 32 that adjusts the distance between the pair of rolling body rolls 24 to adjust the distance between the rolls 24 .

In the conventional rolling mill configured in this way, the aluminum strip A is unwound from the coil B attached to the unwinding reel 20, passes through the entry side deflector roll 21, and changes the bus direction to horizontal. Entry side plate thickness deviation gauge 22
After measuring the sheet thickness deviation before rolling, the sheet passes through the entrance mill guide 23 and is bitten into the rolling body roll 24 while being held stably in the width direction. After the strip A is rolled down by the drive roll of the rolling main body roll 24, it is delivered to the outlet thickness deviation gauge 25. vinegar)
After the IJ tube A passes through an outlet thickness deviation gauge 25 to measure the thickness deviation after rolling, it is wound onto a take-up reel 27 via an outlet deflector roll 26.

Measured values such as plate thickness, roll rotation speed, etc. are input to the control device 30, and the control device 30 uses these information to
Via the drive device 31, the interval (reduction amount) of the rolls 24 by the hydraulic reduction device 32 is adjusted to control the plate thickness.

In recent years, the required accuracy of plate thickness in cold rolling has become stricter, and for this reason, automatic plate thickness control technology using the control device 30 has been improved, and hydraulic control with extremely high responsiveness has been developed due to the development of hydraulic technology. A hydraulic pressure reduction device using a valve has been developed.

Conventionally, fluctuations in tension on the entry side are predictively controlled by feedforward automatic plate thickness control (F-F AGC) as described below. That is, the entry side plate thickness deviation meter 22
From the plate thickness deviation signal measured by , the entrance tension fluctuation corresponding to this deviation signal is predicted, and this position is tracked.

Then, at the instant of rolling, a necessary amount of tension control corresponding to this is applied to the drive motor of the unwinding reel 20, and the current is controlled so that the tension is constant.

[Problems to be Solved by the Invention] However, conventional rolling mills have the following drawbacks. First, the drive system of the rewind reel 20 generally has a large reduction ratio, and the weight of the gears is also heavy, resulting in a large structural drive loss.

Further, since the diameter of the coil B attached to the rewind reel 20 gradually decreases, the weight and rotation speed of the coil change over time. Therefore, the amount of change in inertial force is large.

Furthermore, in addition to the above-mentioned factors, there is also a low tension control response capability to the drive device of the rolling material take-up wheel 27, and this tension control typically has a delay of 200 to 250 m5ec. For this reason, for example, if the distance between the entrance side plate thickness deviation gauge 22 and the drive roll 24 of the rolling mill main body is 2000 mm, the input side strip speed that can be tracked has a response delay of 2
In case of 50m5ec, 480m/min, response delay is 200m
Eioom/min for m5ec. Therefore, in a conventional rolling mill, the entrance strip speed is 500 m
It is difficult to control the tension at high speed rolling of 1/min or higher.

The present invention has been made in view of such problems, and includes:
To provide a rolling mill equipped with an entry side tension fluctuation absorption device capable of controlling tension fluctuations of an IJ tube with high responsiveness and controlling plate thickness with high accuracy even during high-speed rolling. The purpose is to

[Means for Solving the Problems] A rolling mill equipped with an entry side tension fluctuation absorbing device according to the present invention has the following features:
an unwinding reel on which a coil of strip is attached; a rolling body roll for rolling the strip unwound from the unwinding reel; and a rolling body roll disposed between the rolling body roll and the unwinding reel for rolling the strip through which the strip passes. a deflector roll that bends a locus, a guide means that supports the deflector roll so that it can reciprocate in the direction toward the rolling body roll, and the guide means based on information regarding the thickness of the strip on the entry side of the rolling body roll. and a control means for moving the position of the deflector roll guided by the deflector roll.

[Operations] In the present invention, the strip unwound from the unwinding reel is bent in its path by a deflector roll, and then rolled by a rolling body roll. Then, the control means predicts the amount of tension variation based on the information regarding the thickness of the strip entering the rolling body roll, and moves the deflector roll to a predetermined position by guiding it by the guide means in accordance with this amount of tension variation.

Therefore, for example, if it is predicted that the tension of the strip will decrease due to an increase in the thickness of the strip at the entrance side of the rolling body roll, when this part is bitten by the rolling body roll, the control means will move the deflector roll to the rolling body roll. Move it away from the roll to increase the tension. In this way, tension fluctuations are absorbed by the movement of the deflector roll.

This deflector roll is relatively light and has relatively small and stable fluctuations in the applied force, making it extremely responsive. Therefore, the plate thickness can be controlled with high precision even during high-speed rolling.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing a rolling mill according to an embodiment of the present invention, FIG. 2 is a vertical sectional view showing a deflector roll device 1 thereof, and FIG. 3 is a plan sectional view thereof. Components in FIG. 1 that are the same as those in FIG. 4 are given the same reference numerals, and explanations of overlapping parts will be omitted.

In this embodiment, an entry side tension detection device 34 is disposed below the entry side mill guide 23, and the entry side strip tension detected by this entry side tension detection device 34 is
It is input to the C control device 30. Further, the plate thickness control signal from the control device 30 is input to the hydraulic reduction device 31, and the strip entry side tension control signal is input to the speed control conversion device 35, which controls the rotation of the unwinding reel 20. Controls the power and control strokes of the deflector roll 1.

Next, the deflector roll will be explained in detail with reference to FIGS. 2 and 3.

The deflector roll 1 has a housing 2 extending in a direction perpendicular to the passing direction of the strip A (indicated by arrow C), and insert pin bearings 3 provided at both ends of the housing 2 in the longitudinal direction. An insert pin 4 is rotatably attached to the insert pin bearing 3 and extends in a direction perpendicular to the strip passing direction (arrow C). This insert pin 4 is disposed directly above the strip A, and the threads are cut in opposite directions on both sides of the widthwise center of the strip A. A base part 6 is attached to one end of the housing 2 and extends from the housing 2 to the side thereof, and a drive motor 5 is installed on the base part 6.

The drive shaft of this drive motor 5 is screwed through an appropriate transmission.
l! 4, and the insert pin 4 rotates in the forward and reverse directions as the motor 5 rotates in the forward and reverse directions. The wedge 7 can slide on a guide surface 8 of the housing 2 that extends in a direction perpendicular to the direction of the arrow C, and can move in a direction perpendicular to the direction of the arrow C. The wedge 7 has a screw hole (not shown) formed in its center, and the insert pin 4 is screwed into this screw hole.
When the insert pin 4 rotates forward and backward due to the rotation of the motor 5, a pair of wedges 7 that are threaded onto the insert pin 4 and guided by the guide surface 8 move toward each other or move away from each other on the guide surface. Move along 8.

The deflector roll bearing 10, which is U-shaped in plan view, is supported so that its front end screen slides on the bearing guide 9 extending in the direction of the arrow C, so that it can move along the bearing guide 9 in the direction of the arrow C. A compression spring 12 is interposed between a stopper 11 provided at the upstream end of the bearing guide 9 in the strip passing direction and the front surface of the bearing 10. Further, the side surface of the bearing 10 on the insert pin 4 side is formed to be inclined with respect to the longitudinal direction of the insert pin 4,
The inclined side surface of the bearing 10 engages with the side surface of the wedge 7 on the bearing 10 side, so that the wedge 7 and the bearing 10 can move while sliding against each other on a horizontal surface.

A circular hole 14 is provided at the leading end of the image located on both sides of the width direction of the strip A in the deflector roll bearing 10, and by fitting the shaft 15 into this hole 14, the deflector roll 13 can be rotated. It is supported by a bearing 10. As a result, the deflector roll 13 is interposed in the passage area of the strip A with its axial direction perpendicular to the passage direction of the strip A (direction of arrow A).

Next, the operation of the rolling mill configured as described above will be explained.

First, the strip A unwound from the coil B mounted on the unwinding reel 20 rolls on the deflector roll 13 and bends its path horizontally, and then heads toward the rolling body roll 24. Then, this strip A is measured by the entrance side plate thickness deviation meter 22 to obtain a deviation ΔS from the predetermined plate thickness t1.
is measured.

This deviation ΔS is input to the control device 30, and from this ΔS, the amount of tension variation on the inlet side is predicted, and this amount of tension variation is trapped and stored for the position of the strip A. Then, this position arrives at the casting position of the rolling body roll 24,
At the time when the sheet is bitten by the rolls 24 and rolled, the control device 30 outputs a control signal corresponding to the deviation ΔS to the drive motor 5 of the deflector roll device. That is, when the deviation ΔS is positive and the entrance side plate thickness is thicker than the predetermined plate thickness 1+, the motor 5 is rotated to rotate the insert pin 4 in one direction, and the pair of screws screwed into this screw tlI4 are The wedges 7 are moved toward each other. As a result, the deflector roll bearing 10, which is engaged with the wedge 7 on its inclined surface, moves along the bearing guide 9 in the direction opposite to the direction of arrow C, that is, in the direction away from the main body roll 24. Then, the deflector roll 13 moves to position 8 in FIG. 2, and the tension on the strip A increases. As a result, since strip A has a thick plate thickness of t1+ΔS, more reduction is applied during rolling and the tension tends to decrease, but the tension increases to compensate for this, so the rolling body roll When rolled by 24, it is maintained at a constant tension,
The plate thickness after rolling is controlled to a predetermined plate thickness t2. On the other hand, when the deviation ΔS is negative, the entrance side plate thickness is thinner than the predetermined plate thickness t1, so the motor 5 is rotated to rotate the insert pin 4 in the opposite direction to the one direction. As a result, the wedge 7 screwed onto the insert pin 4 is moved in the direction away from each other. Then, the deflector roll bearing 10 moves in the direction of arrow C along the bearing guide 9 due to the biasing force of the spring 12. As a result, the deflector roll 13 moves to position D2 in FIG. 2, and the tension on the strip A is reduced.

Therefore, since the strip A has a thin plate thickness of tl-ΔS, the rolling reduction during rolling is small and the tension tends to increase. Since it is rolled, the tension is kept constant and the thickness of the plate after rolling is controlled to a predetermined plate thickness t2.

In this way, by predicting the amount of tension variation on the entry side based on the measured value of the thickness deviation on the entry side and controlling the position of the deflector roll 13 during rolling, it is possible to absorb tension fluctuations in the strip A with high responsiveness. can.

Note that the deflector roll 13 is always maintained so that its position before the start of rolling is at the center of the control stroke 1. Further, the tension detected by the entry side tension detection device 34 is feedback-controlled to the AGC control device 30 so that the tension of the strip A is within a prescribed range that can be adjusted by moving the deflector roll 13.

Further, in the above embodiment, the wedge 7 and the bearing 10 are driven by the rotation of the motor 5, but depending on the rolling characteristics such as the rolling speed and the requirements for plate thickness accuracy, for example, cylinder driving by a hydraulic servo may be used.

Furthermore, the AGC control system and tension control system of the rolling mill can be combined in various ways to provide an optimal control system for the entire rolling mill.

[Effects of the Invention] According to the present invention, fluctuations in the tension of the IJ tube can be absorbed with high responsiveness and at high speed by moving the deflector roll, so the rolling speed can be maintained at high speed. The thickness of the thin plate material after rolling can be controlled with high precision while maintaining high productivity.

Therefore, according to the present invention, it becomes possible to fully utilize the sheet passing speed capability of a rolling mill, and this invention significantly contributes to the improvement of cold rolling technology for aluminum and the like.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing a rolling mill according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view showing the deflector roll device thereof, Fig. 3 is a plan sectional view thereof, and Fig. 4 is a conventional rolling mill. FIG. 1; deflector roll device, 2: housing, 4; insert pin, 5; drive motor, 7; wedge, 9: bearing guide, 1
0; Deflector roll bearing, 13; Deflector roll,
20; Unwinding reel, 22; Plate thickness deviation meter, 24; Rolling main body roll, 30; Control device (Fig.

Claims (1)

[Claims] (1) a rewinding reel to which a coil of strip is attached;
A rolling main body roll that rolls the strip unwound from the unwinding reel, a deflector roll that is disposed between the rolling main body roll and the unwinding reel and bends the passing trajectory of the strip, and the deflector roll. Control for moving the position of the deflector roll guided by the guide means based on information regarding the guide means movably supported in the direction toward the rolling body roll and the thickness of the strip on the entry side of the rolling body roll. A rolling mill equipped with an inlet tension fluctuation absorbing device, characterized in that it has: