JPS58184006A - Method and device for controlling width and thickness of band steel - Google Patents

Abstract

PURPOSE:To control the width and thickness of a band steel uniformly by providing a rough control part which rolls down and corrects the width and thickness only in the longitudinal end part of the band steel and a fine control part which rolls down and corrects the width and thickness for the overall length of the band steel. CONSTITUTION:A basic unit A is formed of vertical rolls V of which the right and left rolls are paired and which are in press contact with both edges of a band steel (a), horizontal rolls H which are located in the same position on the line in the width direction as the position where the rolls V are in press contact and engagement with the band steel (a) and are in press contact and engagement with the top and bottom surfaces of the band steel (a) near both edges thereof, and a roll B for preventing buckling disposed between the right and left horizontal rolls H. A pair of upper and lower masher rolls M which screw down and correct the edges having an increased thickness are disposed on the downstream of said basic unit, whereby a rough control part 10 for width is provided. A fine control part 29 consisting of the plural units A and a pair of the rolls M is disposed on the downstream thereof. The band steel (a) having a uniform width and thickness is thus obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for uniformly controlling the width and thickness of a descaled copper strip.

During the rolling process of copper strip, it is inevitable that edge drops (thin walled parts) occur at both ends in the strip width direction. Site 9 trimming is performed using round blade shearing. However, in this side trimming, both edges of the copper strip are cut off over several millimeters to several tens of millimeters, so there is a drawback that it usually causes a yield loss of 1 to 2%, and it also depends on the properties of the sheared surface. had the disadvantage that the edges of the finished product after cold rolling became saw-toothed, degrading quality.

As a means of compensating for this drawback, the present inventors have developed a technique for simultaneously rolling the descaled copper strip in the strip width direction and the strip thickness direction, for example, at the outlet side of a pickling line or at the inlet side of a cold rolling tandem mill. We have already developed a method for obtaining a desired plate thickness by correcting the reduction in thickness without performing site rimming by shearing (Japanese Patent Application No. 47,689/1989).

In this earlier application, the basic technical idea was to first create a steel strip α of uneven width with edge drops b on both edges, as shown in Figure 1 (c)). Then, correct the width using the vertical roll V. At this time, a slight bulge d is generated at the edge of the steel strip α due to the reduction, resulting in a so-called dogbone shape, but at the same time, the upper and lower horizontal rolls H The copper strip is held down to prevent the plate from bending and shaking, and at the same time, the protrusion d of the edge portion is suppressed toward the center and is made uniform across the entire width. , ・ 1 Therefore, in order to prevent the plate width W corrected at the time of width adjustment shown in Figure 1) from being deviated at the time of vertical reduction shown in Figure 1, the width correction and plate thickness should be adjusted. Make sure that the correction reduction and reduction are performed at the same location, or at slightly different locations and at approximately the same time. When the amount of correction of the sheet width or thickness is large, the above-mentioned reduction correction process is performed at multiple consecutive positions to appropriately share the amount of correction, and the roll spacing of the final set is adjusted to the desired sheet thickness T and sheet width. Set each to W.

Rolling using such control means is extremely effective as it can improve the width accuracy without causing trimming loss, but looking at the width of the material rolled using the method of this prior application, it is found that As shown in Figure 2, although almost the entire length of the material in the longitudinal direction is controlled to the target value R, large errors appear in a certain range between the top T and bottom B of the material, and the control result is not necessarily satisfactory. It is not.

Therefore, the first object of the present invention is to provide a means for stably controlling the plate width and thickness over the entire length of the material, including the top and bottom, by further improving the control means of the prior application. The aim is to further improve quality and yield.

In the present invention, a plurality of sets are provided on the line using the same roll configuration as the previous application as a basic unit, and the upstream side is selectively used as an eccentric control section, and the downstream side is always used as an eccentric control section. .

As shown in FIG. 3, the basic unit of rolls constituting the present invention consists of vertical rolls V that form a pair on the left and right and press against both edges of the steel strip α, and a position where the vertical rolls press and engage with the copper strip. A horizontal roll H that is located on the same line in the sheet width direction and press-fits into the upper and lower surfaces near both edges of the copper strip, and a backlink prevention roll B that is placed between the left and right horizontal rolls, and It consists of a pair of upper and lower matsha rolls M located slightly downstream of the roll group and correcting the edge thickness increased by width reduction.

A1. A specific example of an apparatus for carrying out the method of the present invention is shown in FIG. Since this device is installed symmetrically opposite the positions of both edges of the running copper strip, only one side thereof will be described.

The roll housing 1 is integrally fixed to the sliding door 11 and is movable in the widthwise direction of the sheet, and also includes two horizontal rolls H and one vertical roll V, each of which forms a pair of upper and lower sides. It's crowded. The six rolls are assembled on the same line in the width direction of the sheet at a position where they can be press-fitted and engaged with the steel strip α simultaneously from three directions, up and down and lateral.

The upper horizontal roll H is movable in the vertical direction by a fluid pressure cylinder 21, supported so as to be able to adjust the amount of reduction, and the rotation of the drive motor 22 is transmitted through a universal joint. The lower horizontal roll H is an idle roll and has a bearing fixed to the roll housing 1. Similarly, the vertical roll (■) is also made into an idle roll. The roll housing 1 incorporating these rolls is pressed in the direction of the edge of the steel strip α by a hydraulic cylinder 5, causing the vertical roll 2 to perform a desired rolling reduction.

A buckling prevention roll B is horizontally arranged between the pair of left and right roll housings 1, facing in the board width direction.
Press the top and bottom of the copper strip as an idle roll.

A roll unit A and a matuja roll M having the configuration shown in FIG. 4 are sequentially arranged on a rolling line as shown in FIG. Let it be 1o. Then, a plurality of units A and one matuja roll M are arranged as a set on the downstream side, and this is set as an eccentric position control section 20.

In the method of the present invention, after setting the target plate width value for the final set of roll units of the eccentric control section 20, the plate width and plate thickness are simultaneously rolled. Constant eccentricity control section 2 over the entire length of the steel strip α
0 is operated to perform rolling, but the uneven assembly control section 10 is not used for rolling the normal part, but is used selectively only when passing the top T and bottom B of the steel strip α, Rolling is performed by using the control unit 10 and the eccentricity control unit 20 in duplicate.

A sixth example of use of the device 100 of the present invention configured as described above is described below.
As shown in FIG. In the example shown in FIG. 6, this device is installed next to the pickling tank 50 to create a rolling area after correction and rolling. The example shown in FIG. 7 is provided on the entry side of a cold rolling mill 60 to perform correction rolling and then cold rolling.

In either case, the edge drop of the copper strip is removed, the plate crown is also reduced, and the plate width accuracy is satisfied.

Next, specific examples according to the method of the present invention will be described.

Plate width variation target width ±3mm, descaling pickling method hot rolled copper strip with plate crown 60μ (3,011X 12361!11X
25 tons) was passed through the installation line of this device, and by applying pressure in the board thickness direction and the board width direction, it was possible to uniformize the board width to 1232 mm. In this case, since 14+m was traditionally cut off as a trim allowance, this amount is converted into a finished product.
An improvement in trim yield of 1.1% was observed. Further, the 90 burr on the edge after cold rolling was reduced by 9μ compared to the method of the prior application. Therefore, unnecessary thickening of 9 μm was unnecessary compared to the conventional product, and the yield was improved by 0.9%.

As described above, according to the control method of the present invention, it is possible to simultaneously correct the reduction in the width direction and the thickness direction of the copper strip, and moreover, it is possible to correct the reduction to a uniform value over the entire length 111 including the top and bottom parts. Accordingly, width accuracy can be further improved without causing trimming loss. Therefore, it is extremely effective in improving the product yield.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing step by step the principle of the rolling correction process of the present invention. FIG. 2 is a diagram showing the board width control state before implementing the method of the present invention. FIG. 3 is a top view showing the configuration of the basic unit according to the present invention. FIG. 4 is a front view showing one embodiment of the device according to the present invention with one symmetrical side omitted. FIG. 5 is a perspective view of an embodiment of the apparatus according to the present invention. FIGS. 6 and 7 are schematic explanatory diagrams showing an example of use of the apparatus of the present invention.

Claims (2)

[Claims] (1) On the line where the hot-rolled and descaled copper strip runs, there is a coarse control process that corrects the width and thickness of the copper strip only at the longitudinal ends of the strip, and the entire length of the copper strip. A finely controlled step of correcting the width and thickness of the copper strip is performed at least once each, so that the desired width and thickness can be obtained in the final rolling. Width and thickness control methods. (2) At least a pair of width rolling vertical rolls provided in pairs on both sides of the copper strip running line, at the same position on the strip width direction line as the position where the vertical rolls press and engage with the copper strip. A basic unit having a pair of horizontal rolls that press and engage the upper and lower surfaces of the copper strip at a distance within a range where the copper strip does not buckle; The width of the copper strip is made up of an uneven setting control section composed of a pair of matuja rolls for correcting and rolling down thick edges, and an eccentric control section composed of a plurality of sets of the basic units and a pair of the matuja rolls. and thickness control device.