JPS59110404A - Hot tandem reverse rolling installation - Google Patents

Abstract

PURPOSE:To decrease the number of rolling mill stands and to reduce construction cost by disposing >=3 units of rolling mills which can reverse the rolling directions in proximity to each other, providing coilers on the inlet and outlet sides thereof and making reverse rolling possible. CONSTITUTION:A slab conveyed from a slab producing installation is roughly rolled by >=3 units of rolling mills 2 which permit reversing in rolling direction. The roughly rolled bar is run backward and is rolled. The strip 1 rolled in the 2nd pass is once coiled on an intermediate coiler 5. The strip is then cooled by a cooler 3 and is coiled on a coiler 4, whereby a final product is obtd. The number of rolling mill stands is decreased and the contruction cost is reduced by such installation.

Description

[Detailed description of the invention] Concerning multiverse rolling equipment.

In conventional hot tandem rolling equipment, the ingot coming out of the recuperation furnace is rolled in advance to a thickness of 20 to 60 mm in one to six rough rolling mills, and then rolled in a finishing mill or seven finishing mills. The strip was rolled into a 2 to 12-fold strip over a total of 10 passes or more.

Therefore, the number of rolling mills in the entire line increases, and the line length also increases, resulting in disadvantages such as extremely high construction costs.

In order to eliminate the drawbacks of the conventional hot tandem rolling equipment mentioned above, the present invention reduces the number of rolling mills by arranging three or more strip rolling mills in close proximity and making it possible to reciprocate the entire strip rolling mill. The present invention relates to a hot tandem reverse rolling facility that significantly shortens the line length and reduces construction costs.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which the pass line VC of string (1). Four strip rolling mills (2) capable of reversing the rolling direction are arranged close to each other, and the strip rolling mills (2) are arranged close to each other.
A strip cooling device (3) and a winding machine (4) are sequentially arranged downstream of the pass line of the strip rolling mill (
2) An intermediate winder (5) is provided upstream of the pass line.

After the slabs transported from slab manufacturing equipment such as continuous casting machines are heated in a heating furnace as necessary, they are roughly rolled in four strip rolling mills (2), and then the rough rolled bars are reversely rolled. The strip is rolled by the strip rolling mill (2). At this time, the strip rolled in the second pass is 10~”yOrt
Since it becomes thinner and has a longer overall length, and therefore the length of the equipment becomes longer, it is once wound up using an intermediate winding machine (5). The intermediate winder (5) has the effect of shortening the entry table and preventing a temperature drop in the longitudinal direction of the strip.

Next, the strip wound by the intermediate winder (5) is unwound and passed through the strip rolling mill (2) for a final pass rolling, and after being cooled by the strip cooling device (3), the strip is rolled by the winder (5). 4
) to obtain the final product.

Here, during rough rolling, the roll surface of the strip rolling mill (2) is likely to become rough, so from the viewpoint of the quality of the final product, the final stand in the final pass rolling is as shown in Figure 2. It may be used only at time 0 and not used during the first bus rolling (5) and second pass rolling (c) at high temperatures to prevent roll surface roughness on the final stand.

Furthermore, if the final stand is used only for the final pass, the work roll can be made into a small diameter roll, which is advantageous in controlling the shape of the strip.

In addition, the speed relationship on the output side of the strip rolling mill (2) is reversed during reverse rolling, so the range of maximum and minimum speeds is very wide, and as a result, it does not fall within the speed range of the work roll motor. In some cases, a speed ratio switching type drive may be used.

Furthermore, since many passes are not reliable when rolling thick products, bank passes may be used when rolling in reverse, and rolling may be performed twice in one direction without rolling.

Note that the hot tandem reverse rolling equipment of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

As described above, according to the hot tandem reverse rolling equipment of the present invention, three or more strip rolling mills are arranged close to each other, an intermediate winder is provided on the input side, and an intermediate winder is provided on the exit side.
By installing a whelk cooling device and winding machine to perform reverse rolling, the same number of passes as before can be obtained by simply moving back and forth, reducing the number of rolling mill stands and reducing the number of rolling mill stands. The length can also be significantly shortened,
It exhibits various excellent effects such as being able to reduce construction costs.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the hot tandem rolling equipment of the present invention, and FIG. 2 is a diagram showing a rolling method using the rolling equipment of the present invention. In the figure, (2) shows a strip rolling mill, (3) an IJ tube cooling device, (4) a winder, and (5) an intermediate winder. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1) A hot tandem characterized in that a hot strip steel rolling line is sequentially equipped with an intermediate winder, six or more rolling mills capable of reversing the rolling direction, a strip cooling device, and a winder. Reverse rolling equipment.