JPS62230417A - Correction method for rolling roll leveling and strip mendering in cold rolling - Google Patents

Abstract

PURPOSE:To correct strip meandering and rolling roll leveling in a cold rolling operating by detecting a tension distribution in the plate width direction of a strip on a tension roll and adjusting a roll gap of a cold rolling mill in proportion to a deviation amount of the tension distribution center from the line center. CONSTITUTION:When a strip S on a tension roll 20 eccentrically runs in either right or left side of the line center Cl, a difference between loads on tension sensors 40a and 40b installed symmetrically, bilaterally to the center line Cl is generated, so that a deviation amount of the strip S is obtained as a difference of detected signals of tension meters 50a and 50b and meanderings of the strip S are corrected by a controller 70. A generated deviation between a leveling of rolling rolls 10 and 10 causes uneven thicknesses in the right and left sides of the strip S, so that the unevenness is obtained as a difference between the two tension meters 50a and 50b; rolling draft devices 80a and 80b are controlled in proportion to the difference to adjust a roll gap between the rolls 10 and 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for leveling mill rolls and correcting meandering of a steel strip in cold rolling.

[Conventional technology]

In a cold rolling line, a steel strip to be rolled is unwound from a payoff reel, passed through rolling rolls, rolled to a predetermined thickness, and run on tension rolls to be wound onto a take-up reel.

Prior to the start of rolling, the rolling rolls are leveled (
horizontal setting of the roll axis and adjustment of the roll gap). In addition, during rolling, if meandering (left-right deviation) occurs in the steel strip that passes through the rolling rolls and runs on the tension roll, the steel strip consisting of photoelectric tubes and light receiving tubes installed at appropriate locations on the rolling line RPC (edge position controller) that uses an edge position detector to detect the meandering direction and amount of the toning belt, and based on the detection signal, shifts the payoff reel in the opposite direction to the meandering direction of the toning belt. This is to correct the meandering of the steel strip.

[Problem that the invention seeks to solve]

If there is a deviation in the leveling of the rolling rolls, the steel strip cannot be rolled to a predetermined thickness. In that case, the leveling deviation must be corrected immediately, but conventionally, there is no suitable method for correcting the leveling during rolling, and the leveling is corrected after the line is stopped and the steel strip is removed from the rolling rolls. There must be.

In addition, when a steel strip passes through a rolling roll and runs on a tension roll, the meandering is corrected by shifting the payoff reel located on the opposite side of the rolling roll, so the response is slow and the effect is is not enough.

The present invention aims to solve the above problems.

[Means for solving problems]

The rolling roll leveling and steel strip meandering correction method of the present invention includes installing a pair of tension gauges symmetrically with respect to the line center at appropriate locations on the cold rolling line below the tension rolls; The present invention is characterized in that the tension distribution in the width direction of the steel strip on the tension rolls is detected, and the roll gap of the cold rolling mill is adjusted according to the amount of deviation of the center of the tension distribution from the line center.

[Effect]

If the leveling of the rolling rolls is properly set and the rolled strip is running on the tension rolls along the line center, the center of the tension distribution in the width direction of the steel strip is the line. It matches the center. If the steel strip shifts to either the left or right side (meandering) with respect to the line center, the center of the tension distribution of the steel strip will be
It shifts from the line center to the same side in proportion to the meandering width). The amount of deviation of the center of tension distribution in the steel strip is determined as the difference between the detection signals of a pair of left and right tension meters installed on the line. Based on the difference in the detection signals, the tension band is slid in the width direction of the plate toward the line center by operating the roll-down device of the rolling roll and adjusting the roll gap, and the center of the tension distribution is set at the center of the line center. The misalignment (meandering) of the steel strip is corrected by making it match.

In addition, if a deviation occurs in the leveling of the rolling rolls, the thickness of the rolled steel strip will be uneven on the left and right sides, and the unevenness of the plate thickness in the width direction will be measured by a tension meter as a deviation from the line center of the tension distribution center. Detected. The degree of discrepancy in plate thickness can be determined as the difference between the detection signals of the two tension meters, so by operating the rolling device of the rolling roll accordingly so that the center of tension distribution coincides with the line center, Mill roll leveling is fixed.

〔Example〕

An embodiment of the present invention will be explained with reference to FIG. 1. (10, t
o) are rolling rolls of a cold rolling mill, (80a, 80b
) is a cold rolling roll reduction device, (20) is a tension roll that conveys the cold rolled steel strip (S), (30) is a tension roll support frame, (40a, 40b) is a steel strip tension sensor ( load cell).

The tension roll support frame (30) is attached to the line center (C
It is swingably supported at a fulcrum (31) corresponding to 1),
The tension sensor (40) is in contact with the lower surface of the support frame (30).
a, 40b) are installed symmetrically around the line center (CI).

In the figure, 111'M on the tension roll (20)
When F (S) is running without shifting to either the left or right side, the center (Cs) of the tension distribution of the steel strip (S) coincides with the line center (C), and the left and right tension sensors ( 40a
) Since the loads on (40b) are equal, in the controller (60), the tension gauges (50a) and (50b)
Based on the fact that the signals inputted from and are equal, it is determined that the steel strip (S) does not meander and is running cleanly.

The steel strip (S) on the tension roll (20) meanders, for example, as shown in FIG.
) is running with an offset of Δd to the right from the line center (CG), the left and right tension sensors (40a) (40
The difference in load for b) increases in proportion to the meandering amount (equal to Δd). In the controller (60), the direction of deviation (meandering direction) of the center of tension distribution and the magnitude of the deviation (meandering amount Δd) are determined based on the difference between the two input signals from the tension meters (50a) and (50b). The calculated value is input to the controller (70). Based on the input signal, the controller (70) controls the rolling reduction device (8) so as to slide the steel strip (S) on the tension roll (20) by Δd toward the line center (C/ri).
0a, 80b) to adjust the roll gap of the rolling rolls (10, 10). In the example shown in the figure in which the steel strip (S) meanderes by Δd to the right with respect to the line center (cty), the rolling reduction devices (80a, 80b) are used to reduce the roll gap on the right side of the rolling rolls (10, 10). By controlling the drive and increasing the rolling pressure on the right side, the steel strip (S
) to the left by Δd.

On the other hand, if a deviation occurs in the leveling of the rolling rolls (10, 10) and the thickness of the steel strip (S) becomes uneven on the left and right sides as shown in FIG. The center (Cs) of the tension distribution in (S) is shifted from the line center (CI), and the loads on the left and right tension sensors (40a) and (40b) are biased. In this case as well, the controller (60) calculates the direction and amount of deviation (Δd) of the center of the tension distribution based on the two input signals from the tension meters (50a) and (50b). The value is input to the controller (70), and the controller (70) determines the center (Cs) of the tension distribution of the steel strip (S) based on the input signal.
) is aligned with the line center (C1), that is, the thickness of the left and right sides of the steel strip (S) is equal.
Adjust the roll gap of 0°10). In this case, the center (Cs) of the tension distribution of the tuning band (S) is the line center (C
I) by matching the rolling roll (1o.

It is confirmed that the leveling correction of 10) has been achieved.

〔Effect of the invention〕

According to the method of the present invention, it is possible to automatically and accurately correct the meandering of the steel strip and the leveling of the rolling rolls during a cold rolling operation. Correcting the meandering of a steel strip can be done if the tension in the steel strip is established, not only when the steel strip is passing through the rolling roll section, but also when the tail end of the steel strip separates from the payoff reel.
It can also be carried out at the time of passing through the rolling roll section. In addition, when correcting the leveling of a rolling roll, the rolling roll part has a threaded shape! (Situation H where there is a tension band between the rolling rolls)
) can also be implemented.

[Brief explanation of drawings]

FIG. 1 is an explanatory view of the main part showing an embodiment of the method of the present invention, and FIGS. 2 and 3 are explanatory views of the deviation between the tension distribution center of the tuning band and the line center. 10: Cold rolling roll, 20: Tension roll, 30
: Tension roll support +L 40a, 40b: Tension sensor, 50a, 50b: Tension meter, 60.70:: I controller, 80a. 80b: Rolling reduction device.

Claims (1)

[Claims] (1) The tension in the width direction of the cold rolled steel strip on the tension roll is determined by a pair of tension gauges installed symmetrically at the bottom of the tension roll at appropriate locations on the cold rolling line with the line center in between. A method for leveling rolls and correcting steel strip meandering in cold rolling, which comprises detecting the tension distribution and adjusting the roll gap of a cold rolling mill according to the amount of deviation of the center of the tension distribution from the line center.