JPS6321561B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous hot rolling line arrangement.

A conventional continuous hot rolling line was constructed, for example, as shown in FIG. That is, the hot strip sheet bar A manufactured from the tundish 1 via the rotary caster 2 is uniformized in temperature in the heating furnace 3, and then sent to the finishing mill 4, where it becomes hot strip A' and is then rolled into the hot line table. After passing through the upper cooling device 5, it passes through a looper 6, is cut by a running shear 7, and is wound up by a coiler 8.

Further, as shown in FIG. 2, after the hot slab A leaving the heating furnace 11 is roughly rolled in a rough rolling mill group 12, it is wound up in a so-called Stelco coil box 13.
A sheet bar coil 13' is formed. Then, use the crop shear 14 to adjust the leading and trailing seat bars.
The front and rear ends of A' are cut respectively, and both sheet bars A' and A' are welded by a running welder 15, and then sent to a finishing mill 4 for continuous rolling. Thereafter, it is sent to the cooling device 5 in the same manner as in FIG. 1, and the same operations are performed.

Both of the above-mentioned conventional means are mainly improvements on the inlet side of the finishing mill, and as a matter of course, the strips come out completely continuous on the outlet side of the finishing mill. Therefore, in order to make a coil of a predetermined weight, equipment such as a running shear is required.

By the way, the maximum speed of the running shear on the exit side is approximately half a rotation in the conventional drum type, as it has to reach the required speed after being driven.
Since the limit was 300-400mpm, a large amount of looper was required.

Recently, a miscut method was proposed in Japanese Patent Application Laid-Open No. 52-67889. In this configuration, as shown in FIGS. 3 and 4, the upper blade 23 and lower blade 24 mounted on the upper drum 21 and lower drum 22 are accelerated by rotating several times in advance until they reach the stripping speed. For example, as shown in FIG. 4, the lower blade 24 of the lower drum 22 is in contact with the strip as shown in the diagram, the upper drum 21 is in a position away from the strip, and the upper and lower blades 24 are at the left end position. , 24 are in opposing positions. Then, the upper and lower drums 21 are rotated three times, and the upper blade 23 is at the center position as shown in the trajectory shown in the figure, and the lower blade 24 is placed in the center position as shown in the trajectory shown in the diagram.
Rotated to the opposite position, in this state,
The upper drum 22 is lowered as shown by the broken line to cut the strip. Thereafter, the upper drum 22 rises as shown by the broken line on the right side, and the upper and lower blades 23 and 24 are located in opposing positions at the uppermost position, completing one shearing cycle.

The miscut method mentioned above has a shear between runs.
1000mpm, and it is now possible to handle the maximum stripping speed, making it possible to scrap-cut the joints when sheet bars of different widths or thicknesses are joined and rolled continuously.
I've gotten to the point where I only use the looper when making scrap cuts.

However, the strip speed is around 1200mpm
(20 ps), and due to the time cycle of running shear, the cutting interval is approximately 10 seconds. For this purpose, a loop of 200 meters is required.

Therefore, since a loop length of at least 200 m is required, the looper equipment becomes large and the equipment cost increases. Furthermore, due to the high speed, the looper rolls are subject to severe wear and maintenance is a major problem.

Therefore, an object of the present invention is to provide a hot rolling line arrangement that does not require looper equipment.

The structure of the present invention will be explained in detail based on the embodiment shown in FIG. Pinch roll 3 to control tension and prevent waving at the tip of strip A'
1 is installed, and a pinch roll 32 is installed on the inlet side of the coiler 8 to prevent the strip from springing up. Then, between both pinch rolls 31 and 32, 2
Two running shears 33 and 34 are installed.

On the other hand, a detector 35 for different materials such as different widths and thicknesses is installed on the exit side of the finishing rolling mill 4, and a speed detector 35 detects the strip speed on the hot line table from the rotation speed of the final stand of the finishing rolling mill 4. 36 is installed, and a cut timing command circuit 37 is provided which receives detection signals from both detectors 35 and 36, performs calculations, and sends signals to both running shears 33 and 34. still,
38 is a scrap bag installed on the outlet side of the coiler 8 for storing scraps.

This example is constructed as described above, and is a strip that is continuously rolled and conveyed as in the conventional case.
A' is cooled by a cooling device 5 and wound up by a coiler 8. Then, the foreign material detector 35 strips the
When a joint with a different width or different thickness is detected at A', a signal is sent to the cut timing command circuit 37, and calculation is performed in the cut timing command circuit 37 based on the signal from the speed detector 36. 3
Send commands to 3.

According to the above command, the front of the joint (coiler side)
After cutting with the front running shear 34, the rear of the joint (rolling machine side) is cut to a predetermined length (removal of defective rolling parts due to temperature changes at the tip) by the rear running shear 3.
Cut at 3. The scrap generated by this cutting moves on the table and is transferred to the scrap bag 38.
is stored in.

Incidentally, in order to adjust the winding amount of the coiler 8, when cutting the same strip A' in the middle, it is sufficient to use one of the running shears as in the conventional case.

Further, it is more convenient to provide two different material detectors 35 to detect different widths and different thicknesses separately.

The present invention has the above-mentioned configuration and operation, and when continuous rolling is performed, there are many types of dimensional configurations of the strip fed from the exit side of the finishing rolling mill. Therefore, it is natural that joints of different widths, different thicknesses, different steel types, etc. must be cut to a length of 1 m to 10 m.

In the present invention, by using two running shears, the strip is cut at two places while being conveyed at the speed on the exit side of the finishing rolling mill, so that it is possible to easily cut at a predetermined place without the need for a looper. Can be done.

As a result, equipment costs and maintenance for conventional looper equipment are eliminated, reducing costs.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a hot continuous line using a conventional rotary caster, Fig. 2 is a schematic diagram showing a part of another hot continuous line, Fig. 3 is a side view of a running shear, and Fig. 4 5 is a diagram showing the operation cycle of the upper and lower blades and the drum of the miscut method, and FIG. 5 is a schematic diagram of the main part of an embodiment of the arrangement row of the hot continuous line according to the present invention. In the figure, 4 is a finishing rolling mill, and 33 and 34 are running shears.

Claims (1)

[Claims] 1. An arrangement of a continuous hot rolling line characterized in that two running shears 33 and 34 are installed in series next to a finishing rolling mill 4 and a hotline table in the continuous hot rolling line.