JPS61150704A - Rolling installation - Google Patents

Abstract

PURPOSE:To correct an edge drop, a middle waviness and a roll mark, etc., and to obtain a product of high quality by disposing at least one set of multiroll cluster mill having the rolls of specific conditions at the front of the final stand of a tandem mill installation. CONSTITUTION:In multiroll cluster mills 10, 11, the ends of mutually opposite sides of upper and lower work rolls 2 are tapered respectively, and are controllingly moved in their axial directions. Accordingly, both-side ends of a rolling stock 1 are swelled reversely, and a rolling stock free from edge drop is obtained. But in the rolling of correcting this edge drop, a roll mark due to the starting point of taper of the body-end of work roll 2, is often produced in the vicinities of both side-ends of stock 1, or middle waviness is produced to lower the quality of stock 1. Then, a poor shape due to these roll mark and middle waviness, etc. is perfectly corrected by using the mills 10, 11 as the edge-drop correcting machines and using a mill 12 having an ordinary shape-controlling function for the final finishing machine.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a rolling equipment that can satisfactorily control the shape of a rolled material and has excellent productivity.

<Conventional technology> So-called tandem rolling equipment, in which multiple rolling mills are arranged in series, sequentially passes plates through multiple rolling mills and rolls them one after another. It is widely used in the metal rolling industry, including the steel industry.

This tandem rolling equipment is generally constructed by arranging a plurality of four-high or long-leg rolling mills, but in such conventional tandem rolling equipment, the thickness shape accuracy in the width direction of the plate is not good, especially when the plate material The thickness at both ends is the plate thickness at the center l
There is a so-called edge drop that decreases rapidly compared to this. For this reason, the side edges of the plate material had to be cut off to a large extent, resulting in a significantly low product yield.

In order to eliminate the shortcomings such as jin, for example,
As disclosed in Japanese Patent No. 121, etc., tandem rolling equipment has been developed that incorporates a rolling mill that allows adjustment of the axial movement of the rolls and adjustment of the roll pending force. In other words, a rolling mill that has a mechanism for shifting the work rolls in opposite directions in the axial direction and a mechanism that can adjust the bending force of the work rolls, that is, a rolling mill for edge drop correction, is installed at least before the end-of-layer rolling mill. By using a combination of work roll shift action and work roll bending action, the thickness shape and edge drop in the width direction of the strip can be corrected, while the mid-elongation of the rolled material that occurs during edge drop correction rolling can be corrected. Alternatively, in order to improve quality defects such as roll marks that occur on both sides of the plate due to work roll edges, a normal widthwise thickness shape control function that does not involve work roll shifting during the final rolling, such as a work roll bending mechanism, is used. A rolling mill equipped with such equipment, that is, a rolling mill for shape correction is used.

<Problems to be solved by the invention> In conventional rolling mills for edge drop correction, a work roll bending arrangement operated by hydraulic cylinders is used, but the installation space is narrow and there are many vibrations. In addition to being in a bad environment, the roll bearings that are pressed and bent are
Due to this shift, the arrangement structure including the attached hydraulic piping etc. becomes extremely complicated, which has the drawback of increasing equipment costs and maintenance costs. Furthermore, because conventional tandem rolling equipment consists of four-high or long-leg rolling mills, it is not possible to set a large amount of plate thickness reduction per machine, and it is not possible to set a large amount of plate thickness reduction per machine. In addition to having to arrange a large number of rolling mills, it was not possible to fully utilize the effect of the rolling mills for edge drop correction.

An object of the present invention is to provide a compact tandem rolling equipment that can eliminate the above-mentioned various drawbacks of the conventional tandem rolling equipment and can perform high reduction rolling.

Means for Solving the Problems> The rolling equipment of the present invention is a tandem rolling equipment in which a plurality of rolling mills are arranged in series, and includes a set of upper and lower work rolls that can be moved and adjusted in the axial direction of the rolls. , a multi-stage cluster rolling mill equipped with a set of two upper and lower intermediate rolls that can perform roll bending action, and a set of upper and lower reinforcing rolls that support these work rolls and intermediate rolls is installed in the tandem rolling equipment. At least one rolling mill is placed before the final rolling mill.

High reduction rolling is performed by a multi-stage cluster rolling mill with small-diameter work rolls, but the edge drop of the plate material is corrected by the work roll shifting action and work roll bending action in the multi-stage cluster rolling mill. Defects such as elongation in the plate material and roll marks on the side edges caused by the above-mentioned edge drop correction in the rolling mill are corrected.

Embodiment FIG. 1 shows the appearance of an embodiment in which the rolling equipment according to the present invention is applied to a three-stand tandem mill, and FIG. As shown in Fig. 2, the cluster rolling mill of this embodiment includes a pair of upper and lower work rolls 2 having a roll diameter of, for example, 200 mm to 300 mm, which apply rolling blades to the rolled material l, and the workpiece. roll 2
A set of intermediate rolls 3 with two rolls each on the upper and lower sides support the intermediate rolls 3 from above and below, and a set of split reinforcing rolls 4 with three rolls each on the top and bottom that support the intermediate rolls 3 from the top and bottom. 2.3°4 is a 12-tier roll arranged in a cluster. The upper and lower workpieces 2 are configured to move in opposite directions in the roll axis direction, and the intermediate roll 3 uses a roll bending arrangement 78 installed between a common metal chock 5 and a housing 6. It is supported so that it can perform roll bending action. The third enlarged part of work roll 2
As shown in Figure (a), each of the opposite ends 2a of the upper and lower work rolls 2 is tapered into an n-taper shape.

Further, the reinforcing rule 4 is divided into a plurality of pieces in the axial direction,
Supported by the metal chock 8 and its support frame 91ζ, the rolled material 1 is rolled through the plate on the right side in FIGS. 1 and 2.

When rolling is performed using this multi-stage cluster rolling mill, the body end of the work roll 2, that is, the starting point of the taper, is an appropriate distance from both ends of the rolled material 1, depending on the width and shape of the rolled material 1. Shift the work roll 28 so that it is at a position l closer to the width center of 1. When rolling is performed using conventional work rolls that do not shift, the part of the work roll 20 in contact with the rolled material 1 is deformed by the rolling load, as shown in FIG. Edge drops 1a, which are flattened and have a reduced thickness at both ends of the rolled material 1 compared to the center, occur. However, in this rolling mill, as shown in the third factor @) As a result, the edge drop of the rolled material 1 is reduced, or the edge of the rolled material 1 is conversely raised due to the relief of the tapered part, and a rolled material 1 without edge drops can be obtained. In this embodiment shown in FIG. 1, rolling mill 10.1 in a three-stand tandem rolling facility
1, a multi-stage cluster rolling mill as described above is used, and these are used as rolling mills for edge drop correction.

However, work roll 2 processed into a tapered shape
Rolled material 1 that is rolled with the taper starting point from the side end of the rolled material 1 toward the center often has a-ru mark due to the taper starting point of the body end of the work roll 2 near both side ends. There is a problem in that the quality deteriorates due to elongation or elongation in the middle. Therefore, in this embodiment, in the tandem rolling equipment shown in FIG.
1, these are arranged in front of the final rolling mill 12, that is, on the upstream side in the sheet passing direction, and a multi-stage cluster rolling mill equipped with a normal shape control function without work roll shifting is arranged as the final rolling mill 12. This is a tandem rolling mill. The shape control function in the final rolling mill 12 for shape correction is achieved by extruding each of the reinforcing rolls 4, which are divided into a plurality of pieces in the roll axis direction, toward the work roll 2 via eccentric bearings, for example. This makes it possible to control the shape of l. In this way, the rolled material 1
In the case of rolling mills 10 and 11ζ for edge drop correction, the edge drops were improved.Furthermore, in the rolling mills 10 and 11 for edge drop correction, shape defects such as roll marks and mid-stretching occurred near the side edges. It is completely corrected in the final rolling mill 12 for correction.

In the above embodiment, the three upstream rolling mills in a three-stand tandem rolling facility are the rolling mills 10 and 11 for edge drop correction, and the final rolling mill 128 for shape correction. Although a multi-stage cluster rolling mill was used in all of these embodiments, the present invention is not limited to such embodiments. In other words, the number of rolling mills is not limited to Odai, but any number can be selected as needed, and the number of rolling mills for edge drop correction is not limited to three, but may be only one or more than Odai. It is also possible to do this.

Furthermore, the type of rolling mill does not necessarily have to be a multi-high cluster rolling mill, except for a mill for edge drop correction, and it is also possible to use a conventional four-high or long-leg rolling mill. However, even in this case, it goes without saying that the rolling mill for final shape correction must be equipped with a shape control function such as roll bending or initial roll cutting.

<Effects of the Invention> According to the rolling equipment of the present invention, the edge dross of the rolled material is improved in the rolling mill for edge drop correction, and the roll near the side edge of the strip generated in the rolling mill for edge drop correction is improved. Shape defects such as marks and mid-elongation are completely corrected, and a rolled material with good quality can be obtained. or,
The multi-stage cluster rolling mill used in the present invention can use small-diameter work mills, making it possible to perform high-reduction rolling to improve productivity and save energy. It is possible to reduce the number of rolling mills compared to a tandem rolling facility in which rolling mills such as the above are arranged, and it is possible to realize a reduction in equipment and maintenance costs.

[Brief explanation of drawings]

Fig. 1 is a schematic layout diagram of an embodiment of rolling equipment according to the present invention, Fig. 2 is an enlarged view of the multi-stage cluster rolling mill, and Fig. 3 (
a) is a conceptual diagram of rolling work by work roll shift, 3rd
Fig. 4) is an enlarged view of section 8 in the direction of arrows, and Fig. 4 is a conceptual diagram of the rolling operation when the work roll shifter is not performed. In the drawings, 1 is a rolled material, 2 is a work roll, 3 is an intermediate roll, 4 is a reinforcing roll, 7 is an a-le pending arrangement, 1
0.11 is a rolling mill for edge drop correction, and 12 is a final rolling mill for shape correction.

Claims (1)

[Claims] In a tandem rolling facility consisting of multiple rolling mills arranged in series, there is a set of upper and lower work rolls that can be moved in the axial direction of the rolls, and a set of two intermediate rolls each that can perform roll bending. and a set of upper and lower reinforcing rolls that support these work rolls and intermediate rolls, and at least one multistage cluster rolling mill is disposed in front of the final rolling mill of the tandem rolling equipment. Facility.