JPS59229216A - Sheet width controlling method - Google Patents

Abstract

PURPOSE:To keep always an edging device within a safety range by setting rolls so that a load burdened on the vertical rolls of edging device coincides with a reference value and converting the amount of load variation into a position of vertical roll corresponding to it and transferring the roll position, in a three- point restricting-type edging device. CONSTITUTION:Three point rolls are set so that a load burdened on the vertical rolls of edging device coincides with a reference value P0. A variating load DELTAP with respect to the reference value P0 of vertical roll 46 is computed by a comparison arithmetic device 6 to compute a variation amount DELTAS with respect to a reference position S by an arithmetic device 8. A rolling reduction cylinder 5 is actuated by the amount DELTAS to make always the load of vertical rolls coincide with the reference value P0 thereby keeping always the edging device within a safety range.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the width of a copper strip in a cold rolling process.

In the method of rolling a copper strip, a method for simultaneously correcting the reduction in both the strip width and thickness has been applied for as a three-point restraint type edger device by the present applicant, but conventional technology of this type has It was concerned with the structure, usage, etc., and did not specifically explain the control method.

Therefore, it is an object of the present invention to provide a concrete sheet width control means in a three-point restraint type edger, and to improve sheet width accuracy.

Prior to explaining the sheet width control method of the present invention, the configuration of a three-point restraint type edger device, which is the basis of the rolling function, will be explained with reference to FIG. The device is installed symmetrically opposite the positions of both edge portions of the running steel strip α, and the roll housing 1 is slidably fixed to the Rad 11 and moved in the width direction of the strip. in the roll housing 1,
Two horizontal rolls 2.6, which form a pair of upper and lower sides, and one vertical edge roll 4 are incorporated.

As shown in Fig. 1, six rolls 2.6.4 are made of steel strip α
The steel strips are provided in combination in positions where they are press-fitted and engaged with the steel strip simultaneously from three directions, top, bottom, and sideways, on the same line in the width direction of the steel strip. The upper presser roll 2 is movable in the vertical direction by a fluid pressure cylinder 21, supported so as to be able to adjust the amount of pressure reduction, and the rotation of the drive motor 22 is transmitted through a universal joint. The lower presser roll 6 is an idle roll, and a bearing is fixed to the roll housing 1. Etsujiya Vertical Roll 4 is also made into an idle role. The roll housing 1 incorporating these rolls is
The copper strip is pressed in the edge direction by the reduction cylinder 5, and the edger vertical roll 4 is made to perform the desired reduction.

As shown in FIG. 2, one of the vertical edge rolls 4 for controlling the sheet width is a fixed roll 4a and the other is a moving roll 4h, and the distance between these two rolls is B. is set fixedly to perform widthwise rolling. However, originally, the roll forming width was set to the target control width B.

Assuming that the position is set at t, the rigidity of the device is naturally not infinite, so if the load required for width reduction is relatively large, the position of the moving roll will inevitably move backward, and the strip width accuracy after control will be The situation becomes worse as shown by the dotted line in FIG. Therefore, in the present invention, the control circuit shown in FIG. 2 is used and set to predetermined conditions to stabilize the plate width accuracy. It is something.

The control method of the present invention will be specifically explained below with reference to FIG. First, in the process of passing the steel strip a, the position of the movable roll 4h is determined by the operation of the reduction cylinder 5, and the fixed roll 4h is
The roll distance from a is the target control width B. keep it. At this point, the load P is suspended on the moving roll 4b. is detected by the load cell 62, and the input switch 61 connected to the first comparator 6 is closed to store it in the first comparator B. From now on, this load is used as the standard value of the vertical roll load ( This lock-on load P is hereinafter referred to as lock-on load. Set the control circuit system to the starting state based on the following.

On the other hand, the reduction cylinder 5 is provided with a displacement gauge 51, and a lock-on load P is provided. Movement roll 4 at the time of setting
b position S. is set in the second comparator 7 as a reference point.

After setting these reference values, actual rolling is started. First, when the steel strip α travels in the direction of the arrow, the rolling load P applied to the moving roll 4h changes in accordance with the width variation. This rolling load P is continuously detected by the load cell 62 and inputted to the first comparator B. The comparison calculator 6 calculates the detected load P and the lock-on load P. Which difference ΔP (
That is, Δp=p−po) is calculated and input to the arithmetic unit 8.

On the other hand, the displacement meter 51 of the reduction cylinder 5 continues to detect the roll position S at the time corresponding to the detected load P, and inputs the detected value S and the reference point S to the second comparator 7. Which difference ΔS(
That is, Δ5=S−S,) is determined and input to the arithmetic unit 8.

The calculation device 8 calculates ΔPC=kX-+ΔS based on the input values ΔP and ΔS, assuming the mill rigidity of this device as K, and adjusts the hydraulic system 9 of the reduction cylinder 5 so that this C becomes zero. Control the servo valve 91 (here, k is a constant and is 1). Under the control of the servo valve 91, the moving roll 4b is moved to the target control width B in the reduction cylinder 5. Hydraulic pressure that can maintain the target control width B is automatically supplied, and the position of the moving roll 4b is fixed and maintained over the entire length of the steel strip σ.

is under pressure.

An embodiment of the control method according to the present invention will be specifically described. The implementation method is to install this device on the outlet side of the pickling line, and to prepare a sheet with a thickness of 3.5 mm after hot rolling, a sheet width of 1226 mm, and a coil weight of 2 mm.
5 tons 1. The material to be rolled is a pickled copper strip with a coil inner width variation of ±4 mm, and the target strip width is B. When width rolling was performed using the control method of the present invention by setting 1219y+m, the result was 1219y+m.
High precision results of ±0.05 mm were obtained. When a similar copper strip material was subjected to conventional fixed position control, the strip width varied by more than 2.0 degrees due to the rigidity of the equipment frame and rolls, and the method of the present invention was found to be more difficult than the conventional method. It was found that the control accuracy was extremely high compared to the previous one.

As described above, according to the sheet width control method of the present invention, a product with extremely high precision can be obtained over the entire length of the copper strip, so that no trimming is required, and there are also effects such as no-edge prevention. In addition, as a cold-rolled base material, dog bones or edge tops do not occur at the edge of the strip, significantly reducing the yield of TMW products, and making it possible to improve pickling efficiency by eliminating the need for trimming. Ta.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a half-rested three-point restraint type edger device used in the strip width control method of the present invention. FIG. 2 is an explanatory diagram schematically showing the configuration of a control circuit of the board width control method according to the present invention. 1: Roll housing 4: Etsuya vertical roll 5:
Reduction cylinder 6: First comparator 7: Second comparator 8: Computation device 9: Reduction hydraulic system a: Steel strip (4 other people)

Claims (1)

[Claims] In a steel strip manufacturing process in which at least one simultaneous plate thickness and plate width reduction device is installed, which simultaneously controls plate thickness and plate width by combining a pair of vertical edge rolls and copper strip upper and lower surface pressing rolls at the same position, The load applied to the edge roll at the time immediately after reducing the width of the tip of the copper strip to the target value is stored in the comparison calculation circuit as a reference value, and it is used when continuing to reduce the width from then on. A board width control method comprising continuously detecting a load applied to an Etsugi vertical roll, and adjusting the position of the Etsugi vertical roll according to the difference between the detected load and the memorized load.