JPS5922603B2 - Automatic strip width control method in cold rolling tandem mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the rolling process using a cold rolling tandem mill,
The present invention also relates to a method of controlling the width of a rolled steel plate.

Automatic plate thickness control (AGC) of tandem mills uses a coarse control method in which the front stage performs reduction control to coarsely control the plate thickness, and the rear stage stand performs tension control to finely control the plate thickness.

Although this tandem mill having an AGC leg assembly only controls the thickness of the steel plate, it would be extremely advantageous if the tandem mill could also control the width of the plate.

In other words, if the plate thickness and width can be controlled in the same process, it is possible to increase the unit weight of the coil by consolidating the base material width in lots, improving productivity and reducing yield loss during trimming. do.

An object of the present invention is to provide a means for controlling strip width at the exit side of the final stand of a tandem mill. The objective is to further streamline the cold-rolled steel sheet manufacturing process.

Originally, as shown in FIG. 1, the AGC of tandem mill C was equipped with a reduction control device 13 and a reduction adjustment device 14 into which detected values from a load cell 11 and a thickness gauge 12 were input, and a tension meter and a tension meter. Tension control device 16 into which detected values of 15 are input.
and a rolling speed adjustment device 17 that is adjusted and operated in response to commands from the tension control device.

In the method of the present invention, a tension pridle roll 2 is provided on the exit side of the final stand of the tandem mill.

A width detector 3 is provided on the exit side of the tension pridle roll 2 so that the width of the steel plate S after width adjustment can be detected.

The detected value of the width detector 3 is inputted into the width control device 4 in step 5.

The width control device 4 is set with a tension reference value corresponding to the desired board width, and the input width detection value is compared with the set value, and the speed is adjusted by controlling the control signal according to the deviation. It is fed into the device 5 so that the speed of the tension/pridle/roll 2 can be varied and adjusted.

In the method of the present invention, AGC control is performed to keep the tension between all stands of the tandem mill constant, and after thickness control rolling is performed, tentering control is performed by tension pridle roll 2. .

The width of the steel plate that has been tentered rolled is immediately detected by the width detector 3, and a feedback signal based on the set value is sent to the width controller 4.
It is then sent to the tension pridle roll 2 via the speed adjustment device 5, where width control is performed.

Example 5 Using stand cold rolling tantem mill, 0.8 m
In the cold rolling of a copper strip of m thickness x 1000mm width and 0.8mm thickness x 995u width, the inter-rolling base material dimension thickness was 3-3-0i.
A 30-ton coil with a width of 11,000 mm was rolled into a 0.80 mm thick x 1,000 mm wide steel strip using conventional constant tension control, and a priddle roll was installed on the exit side of the final stand (/165 stand). The rolling speed was varied, the tension was set to zero, and the width was detected using a width meter installed behind the priddle roll.

As a result, a cold rolled steel strip with a thickness of 0.796 mm and a thickness of 995 mm could be obtained.

The plate thickness at this time was reduced by 4μ from the target value of 0.80 mm, and the plate thickness did not deviate within the normal plate thickness tolerance, and it could be rolled without any problems, and it was 0.8 mm thicker than the same base material size. ×
1000ii width and 0.8mm (actual 0.796mm)
It was possible to roll two types of steel strips with a width of 995 mm.

As described above, according to the method of the present invention, plate thickness control and plate width control can be performed simultaneously in a cold rolling tandem mill, so unit weight is improved by lot consolidation of base material width, and productivity is increased. This reduces the unit power consumption.

In addition, the efficiency of trimming improves the yield of finished products.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of the width control method according to the present invention. 2 tension field roll, 3 dual width detector, 4: width control device, 5: speed adjustment device, 11: load
cell, 12 two thickness gauges, 13: reduction control device, 14: reduction adjustment device, 15: tension meter, 16: tension control device, 17:
Rolling speed adjustment device, S: Steel plate.

Claims (1)

[Claims] 1. Providing a speed-adjustable tension pridle roll on the exit side of the final stand in the cold rolling process, detecting the strip width of the coil that has passed through the tension pridle roll, and applying tension corresponding to the reference strip width. Set value: A width control device with preset values is provided, and the speed of the tension, idle, and roll is controlled based on the deviation between the input signal of the board width detection value and the set value, and all stands of the tandem mill. An automatic strip width control method in a cold-rolling tandem mill, which consists of keeping the tension constant between the strips and producing a thickness control sound.