JPS5825803A - Hot rolling installation - Google Patents

Abstract

PURPOSE:To perform width adjustment of a wide range and to suppress temp. drop by disposing rolling trains consisting of rolling mills for rolling the central part of the width direction and horizontal rolling mills continuously into plural rows in the fore stage of a roughing mill group. CONSTITUTION:Rolling mill trains consisting of CCR rolling mills 5 which roll only the central part in the width direction of an ingot and horizontal rolling mills 6 which roll the entire width are disposed continuously in plural rows in the fore stage of a roughing mill group 2. With one time of pass through said trains, the slab receives considerable broadside rolling with the desired width and the temp. drop of the slab is decreased. After the broaside rolling, the slab is passed through the group 2 and a finishing mill group 3. The width of the slab can be adjusted over a wide range and the temp. drop thereof can be suppressed with said rolling installations. Therefore, the slabs produced by a continuous casting method are satisfactorily rolled with the above-mentioned installations.

Description

[Detailed description of the invention] This invention relates to hot rolling equipment.

When manufacturing slabs in the blooming process.

Generally, the dimensions of the slab are determined by considering the finished dimensions of the coil, so when hot rolling a slab by blooming, the amount of width loss in the rolling equipment can be as small as 10 to 200. there was.

In other words, slabs produced by one-slab rolling or continuous casting are kept in a storage area before being charged into a heating furnace, which is the 11th step of hot rolling, and various slab sizes are sent to this storage area. Store slabs with . Normal in hot rolling.

As a method of rolling this slab, the slab width is sequentially rolled from wide to narrow.

This is to prevent deterioration of sheet pull fill, deterioration of shape, deterioration of surface quality, etc. due to uneven wear of the rolls that occur when rolling a large amount of the same width. However, in recent years, continuous casting methods have become popular.

Improving production efficiency in continuous casting methods has also become an important factor.

One method for improving production efficiency (manufacturing capacity) using continuous casting requires continuous high-speed casting with constant casting dimensions.

However, the requirement for the plate width of hot rolled products is 1■
The material in these aggregated slabs must be rolled into a width of 11JIll units or rolled out.

Here, the width increase and width reduction amount in the conventional technology is 50 to 60.
sa*: If you are trying to operate the newly installed rolling four within the allowable range from the product plate profile, shape, and quality, you will need to grind it again with a rolling amount of about 500 to 800 inches. It must be reassembled into finished rolls and rolled.

In the above-mentioned rolling operation, the rolling mill must be stopped during the four-wheel changeover, which not only reduces the operating rate of the rolling mill, but also
Due to the small pressure m< of the rolls, the re-polishing of the rolls results in a large amount of wear and tear, and from both of these points of view, this operating method has problems in terms of resource and energy conservation.

In order to improve production efficiency using the continuous casting method, the slab dimensions during casting are kept as constant as possible, continuous high-speed drawing is performed, and the slabs obtained are subjected to hot rolling. , 70 to 400 iow, or widening is required.

In addition, in recent years, in order to further promote energy conservation, continuous casting equipment and hot rolling equipment have been deployed continuously, and slabs produced by continuous casting are charged into hot rolling heating furnaces and reheated within a short time. If the method is adopted, the temperature of the slab when heated and extracted in a hot rolling heating furnace! Even if a method of lowering the temperature to about 100°C (previously 1200°C or higher) is adopted, this is the mainstream of hot piezoelectric products. Low [
c] It is known that material deterioration due to insufficient MN solid solution in aluminum killed steel can be prevented. However, in conventional hot rolling equipment rows, it is not sufficient to reduce the temperature drop (low (1)). Finish rolling was difficult.

The present invention has been developed in response to the demands of recent technological trends as described above, and is intended to provide hot rolling equipment that allows for wide width adjustment and reduces temperature drop.

An embodiment of the present invention will be explained below based on the drawings. In the drawing, 1 is a heating furnace, 2 is a rough rolling mill group, 3 is a finishing mill group, 4 is a winding machine, and (vsn) is a scale breaker. be.

In the present invention, two rows of rolling mills each consisting of a front stage kCCR rolling mill 5 and a horizontal rolling mill 6 of the rough rolling mill group 2 are arranged in succession.

The OCR rolling mill 5 is a conventional built-in type with an annular protrusion for widening.
It is called l. This OCR rolling machine 5
According to the book, it takes about 2 cum for 1 roll with a normal rolling machine.
Whereas it is about 0mm.

It is possible to increase the width to about 70vm. Horizontal rolling mill 6
is a normal horizontal rolling mill, which rolls the copper strip during erosion.

Two rolling mill rows consisting of such a CCR rolling mill 5 and a horizontal rolling mill 6 are arranged in succession.

In the figure, E and -E4 are rolling mills*, and R1-'-14 is a horizontal rolling mill.

In the above configuration, the slab extracted from the heating furnace 1 is passed through the OCR rolling mill 5 - horizontal rolling mill @ - CCR rolling mill 5 - horizontal rolling mill 6, and is rolled once to the required width. It is stretched out with a board. Therefore, the temperature drop is also small. After flattening, rough rolling mill group 2. It passes through a finishing rolling mill group 3 and is wound by a winding machine 4.

Also, width killing is performed by edgers E, ~E4 and scale breakers (van).

As a result, in the present invention, it is possible to widen the width and reduce the width without causing a temperature drop, and it is possible to obtain products having a wide range of width dimensions. Therefore, even if the slab is made by continuous casting and has limited dimensions, it can be adapted to the required product.

As explained above, according to the hot rolling equipment of the present invention, a wide range of medium adjustment is possible, and temperature drop can also be suppressed. Therefore, it has the advantage that it can be fully applied to slabs produced by continuous casting, and can also be used in an integrated line of continuous casting and hot rolling.

[Brief explanation of drawings]

The drawing is a layout diagram showing an embodiment of the present invention. 1... Heating furnace, 2... Axial rough rolling mill group, 3... Finishing rolling mill group, 4... Winding machine, 5... CCR rolling mill. 6.--Horizontal pressing machine. Patent applicant: Nippon Kokan Co., Ltd. Inventor: Akira Taniguchi

Claims (1)

[Claims] Rough rolling machine group and this ktsudzu (In a steel strip hot rolling facility consisting of a finishing rolling machine group and a winding machine, a rolling machine that rolls only the central part in the width direction of the steel billet and the rolling machine 1. A hot rolling facility characterized in that a plurality of rolling mill rows each consisting of a rolling mill capable of rolling the eclipse of a steel billet provided immediately after the rough rolling mill group are successively arranged in a preceding stage of a rough rolling mill group.