KR100961354B1 - Pair cross automatic position control method - Google Patents

Abstract

The present invention relates to a fair cross automatic position control method for preventing a poor flowability by reducing the left / right load difference fluctuation even when the top / bottom backup roll and the work roll is crossed in pairs to adjust the angle of the fair cross rolling mill, When receiving a control signal from the control unit for controlling the angle adjustment of the fair cross rolling mill, overrun adjustment of the fair cross head formed by pairing each other on the right and left sides of the work roll and the backup roll according to the received control signal, and overrun And a process of moving the work roll and the backup roll to the center of the pair cross head by the pair cross head.

Fair Cross Rolling Mill, Automatic Position Control (APC), Poor Flowability, Work Roll, Backup Roll, Fair Cross Head, Work Roll Choke, Backup Roll Choke.

Description

PAIR CROSS AUTOMATIC POSITION CONTROL METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling process, and more particularly, to an automatic position control (APC) method for preventing the generation of defective sheeting due to the use of a pair cross facility.

In order to control the crown of the steel sheet in the rolling process, Fair Cross (Pair Cross) facilities are often used. The fair cross is a facility for controlling the crown of the steel sheet, the fair cross rolling machine, as shown in the accompanying Figure 1, the work roll (Work Roll) 20a, 20b in contact with the strip 10, and the work roll ( BackUp Rolls 30a and 30b are pressed in pairs from above 20a and 20b, and the upper work roll 20a and the lower work roll 20b are not parallel but have a predetermined angle (cross angle). Are formed to intersect. That is, the fair cross rolling machine controls the crown of the steel sheet by the cross angle of the upper work roll 20a and the lower work roll 20b.

In general, the fair cross is known to have a large crown control effect, but if the facility management is not very strict, there is a disadvantage that the failure in the flow through, that is, rolling is not made smoothly.

In addition, when rolling by changing a faircross use angle for every rolling coil, since rolling is not made smoothly, generally the faircross is used at a fixed angle as much as possible. When changing the fair cross angle, the fair cross automatic position control is performed by moving the entry / exit fair cross head at a predetermined interval.

FIG. 2 is a diagram illustrating a conventional faircross automatic position control method. Referring to FIG.

Referring to FIG. 2, in the conventional faircross automatic position control, the distance between the entry / exit faircross head 40 and the roll chocks 50 and 60 immediately after calibration is about 1 mm. Thereafter, even if the paircross angle is changed as shown in FIGS. 2B, 2C and 3D, the total distance between the paircross head 40 and the roll choke 50 at the entry / exit side always maintains 1 mm. For example, if the entrance gap is 0.4 mm, the exit gap is 0.6 mm and the gap is always 1 mm.

However, in the conventional faircross automatic position control, the roll and roll chocks are positioned as shown in FIG. 1A attached to the faircross head immediately after the automatic position control before rolling the steel sheet, and the rolling starts. When the work roll WR and the backup roll BUR are in poor alignment, as shown in FIG. 3, the rolling may not be performed smoothly. Here, the work roll WR is momentarily rotated at the point where it meets the steel sheet during the metal-in metal injection (Metal-In), and the work roll WR is momentarily moved in the inward direction by the initial rotation moment. Go back to the exit and generate a crash sound. Subsequently, the work roll WR moves in the inward direction by the counter-repulsion force as much as the force pulling the steel sheet to the rolling mill side to roll again, and at this time, when the moving amount becomes large until the equilibrium point is found, the moving amount becomes very close to the inlet side. If this becomes small, a problem arises between the entry and exit sides.

In order to solve the problems as described above, the present invention is a pair for preventing the poor flowability by reducing the left / right load difference fluctuation even when the top / bottom backup roll and the work roll is crossed in pairs to adjust the angle of the fair cross rolling mill Provides a cross automatic position control method.

The method for achieving the above object of the present invention is a paircross automatic position control method in a paircross automatic position control device for adjusting the angle of the paircross rolling mill in which the upper work roll and the lower work roll are crossed in pairs, When the control signal is received from the control unit for controlling the angle control of the pair cross rolling mill, adjusting the overrun of the fair cross head formed by pairing each other on the left and right sides of the work roll and the backup roll according to the received control signal; And moving the work roll and the backup roll to the center of the fair cross head by the overcross head.

In the present invention, by placing the work roll and the backup roll at the center of the fair cross head, even if the work roll moves to the entry or exit side, the work roll and the backup roll are kept parallel to the backup roll. Since it can prevent, rolling can be performed smoothly.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In the embodiment of the present invention, the work roll and the backup roll are finally positioned at the center of the head while moving the fair cross by a desired angle, so that after the automatic position control ends, even if the work roll moves to the entry or exit side during rolling, it is parallel to the backup roll. To keep.

First, as shown in FIG. 1, the fair-cross rolling mill pushes down the work rolls 20a and 20b and the work up rolls 20a and 20b that are in contact with the strip 10. Are formed by pairing with each other.

A paircross automatic position control device for moving the positions of the work rolls 20a and 20b and the backup rolls 30a and 30b of such a faircross rolling mill is formed.

Next, a structure of a paircross automatic position control apparatus for preventing faircross boarding defects according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 is a diagram illustrating a structure of an apparatus for automatically controlling a fair cross in accordance with an embodiment of the present invention. FIG. 5 is a diagram briefly illustrating a structure of the apparatus for controlling a crosscross automatic position of FIG. 4.

Referring to FIG. 4, the apparatus for automatically adjusting the faircross head includes a faircross head 110, a work roll choke 120, a backup roll choke 130, and a faircross head. It may be configured to include a controller (not shown) for controlling to adjust (110).

The fair cross head 110 is formed to be paired with the entry and exit sides of the drive side (DS) of the work roll choke 120 and the backup roll choke 130, the configuration of the DS also in the work side (WS) It is configured in the same manner as to keep the distance between the fair cross head constant. In addition, the pair cross head 110 is formed in a form in which a side is rotated in a left-right direction in a 'b' shape, and according to a control signal of a controller, screws 101 connected to a motor (not shown) are connected. Drive to adjust the angle.

As shown in FIG. 5, the work roll chocks 120a and 120b are formed at the work rolls 20a and 20b and moved to the entry or exit side by the cross beams 140a and 140b formed to the left and right.

As shown in FIG. 5, the backup roll chocks 130a and 130b are moved to the entry or exit side by the pair-cross heads 110a and 110b formed to the left and right of the backup rolls 30a and 30b.

Such an automatic fairing cross positioning device receives a signal about the angle of the fair cross head measured by the sensor and adjusts the desired angle. Finally, the work roll and the backup roll are positioned at the center of the fair cross head. . This method will be described in detail with reference to the accompanying drawings.

6 is a diagram illustrating a paircross automatic position control operation according to an embodiment of the present invention.

5 and 6, the fair-cross automatic positioning device includes the work rolls 20a and 20b and the backup rolls 30a and 30b by the work roll chocks 120a and 120b and the backup roll chocks 130a and 130b. ) Is moved overrun to be located at the center of the paircross heads 110a and 110b.
Specifically, when receiving a control signal from the control unit for controlling the angle adjustment of the fair cross rolling mill, paired cross formed in the right and left sides of the work roll (20a, 20b) and the backup roll (30a, 30b) in accordance with the received control signal The heads 110a and 110b are overrun controlled by a predetermined distance, and the work rolls 20a and 20b and the backup rolls 30a and 30b are overrun by the pair of crosscross heads 110a and 110b that are overrun. It moves to the center of the 110a, 110b.

For example, when a motor (not shown) is driven by receiving an angle increasing control signal from a control unit, the screws 101 connected to the pair crossheads 110a and 110b by the motor are driven by a predetermined distance. 110b) to increase the angle. At this time, if the distance between the pair crossheads (110a, 110b) and the work roll chocks (120a, 120b) and the backup roll chocks (130a, 130b) is, for example, 1mm, 0.5mm is further added from the preset distance by the control signal. After overrun (after further increasing), the work rolls 20a and 20b and the backup rolls 30a and 30b are moved to the center of the fair cross heads 110a and 110b again by decreasing by 0.5 mm.
That is, when the signal from the controller is an angle increasing control signal, the pair cross heads 110a and 110b and the work roll chocks 120a and 120b, and the pair cross heads 110a and 110b and the backup roll chocks 130a and 130b. The paircross heads 110a and 110b are overrun at a predetermined distance by an "setting value" corresponding to half of the sum of the distances (for example, 1 mm) (for example, 0.5 mm), and increased by the setting value. In the distance, the pair crossheads 110a and 110b are reduced by a set value again to move the work rolls 20a and 20b and the backup rolls 30a and 30b to the centers of the paircross heads 110a and 110b.

On the contrary, when the motor is driven by receiving the angle reduction control signal from the control unit, the screws 101 connected to the paircross heads 110a and 110b by the motor may move the paircross heads 110a and 110b by a predetermined distance by the control signal. To reduce the angle. At this time, as opposed to the case of the angle increasing control signal, by further reducing the 0.5mm at a predetermined distance, and then again by 0.5mm to increase the work roll (20a, 20b) and the backup roll (30a, 30b) to the fair cross head ( It moves to the center of the 110a, 110b.
That is, when the signal from the controller is an angle reduction control signal, after the paircross heads 110a and 110b are further overrun (after further reducing) by the set value, the pair is reduced by the set value. The pair crossheads 110a and 110b are increased by a set value again to move the work rolls 20a and 20b and the backup rolls 30a and 30b to the centers of the paircross heads 110a and 110b.

In addition, the fair cross automatic position control device determines the position of the work roll during rolling, and performs automatic position control so that the work roll remains parallel to the backup roll without movement immediately after completion of the automatic position control moved during rolling.

By adjusting the angle of the fair cross head in this way, as shown in (a) of FIG. 7, the work roll WR and the backup roll BUR are paired with the work side WS and the drive side DS. When placed in the center of the crosshead, as shown in the case of rolling after (c) Metal-In of FIG. 7, even if the work roll WR moves to the entry or exit side, immediately after the automatic cross-position control of FIG. 7 (b) Since it is maintained in parallel with the backup roll (BUR) in the same form as it is possible to prevent the occurrence of the fair cross-flow failure. That is, the work roll and the backup roll are kept in parallel even during rolling so that a left / right load difference does not occur, thereby preventing a faulty mailing.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a view showing the structure of a fair cross rolling mill,

FIG. 2 is a diagram showing a paircross automatic position control of a top or bottom portion on one side of a conventional working side WS or drive side DS; FIG.

3 is a view for showing that the alignment state of the work roll and the backup roll is shifted according to the conventional paircross automatic position control;

4 is a diagram illustrating a structure of an automatic device for controlling a crosscross position according to an embodiment of the present invention;

FIG. 5 is a view briefly illustrating a structure of the apparatus for controlling a crosscross automatic position of FIG. 4;

6 is a diagram illustrating a paircross automatic position control operation according to an embodiment of the present invention;

7 is a view for showing that the work roll and the backup roll is located at the center of the fair cross head through the automatic pair cross position control according to an embodiment of the present invention.

Claims (3)

In the paircross automatic position control method in a paircross automatic position control device for adjusting the angle of the paircross rolling mill in which the upper work roll and the lower work roll cross each other, When the control signal is received from the control unit for controlling the angle adjustment of the fair cross rolling mill, adjusting the overrun of the fair cross head formed by pairing each other on the left and right sides of the work roll and the backup roll according to the received control signal; And And moving the work roll and the backup roll to the center of the fair cross head by the over cross head. The method of claim 1, When the control signal is an angle increase control signal, The overrun adjustment of the paircross heads over a preset distance may include increasing the paircross heads by more than a predetermined distance by a set value. The moving of the work roll and the backup roll to the center of the fair cross head includes reducing the fair cross head by the set value again at an increased distance. . The method of claim 1, When the control signal is an angle reduction control signal, The overrun adjustment of the paircross heads over a preset distance may include reducing the paircross heads by a set value more than the preset distance. The moving of the work roll and the backup roll to the center of the fair cross head includes increasing the fair cross head by the set value again at a reduced distance. .

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