JPS638845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fully continuous rolling array with sheet bar connections.

In a conventional hot rolling line, a hot slab passed through a heating furnace is gradually rolled in a rough rolling mill group and a finishing rolling mill group to form a strip coil.

The above-mentioned rolling method was a discontinuous rolling method in which one slab was rolled at a time, which had the drawbacks of poor efficiency and poor quality.

Therefore, continuous hot rolling equipment, which joins the sheet bar after rough rolling to the preceding sheet bar undergoing finish rolling and continuously rolls the joined sheet bar, has been adopted, dramatically increasing rolling efficiency. Improved.

However, in the above-mentioned continuous hot rolling equipment, the sheet bar after rough rolling is joined to the preceding sheet bar during finish rolling, so the speed of the rough rolling mill is limited by the speed of the finishing mill, so the fuel consumption is The problem was that it also got bigger.

Therefore, the inventors of the present invention previously proposed the means shown in FIG. This means winds a sheet bar 2 roughly rolled in a rough rolling mill 1 into a coil 4 in a coil box 3 known as a so-called Stelco coil box, shifts the position of this coil 4, and then unwinds it. The trailing sheet bar 5 and the preceding leading sheet bar 5' which have been finish rolled in the finishing mill 6 are cut at the leading end and the tail end by a shear 7, respectively.
Adjust the shape of the end. Then, move the welding machine 8 to the rail 9
While moving along the seat bar 5' at the same speed as the seat bar 5', the seat bar 5' is joined while traveling. The joined sheet bars pass through a group of swing rollers 10 and are finished at a finishing mill 6.
The coil is finished rolled and turned into a hot strip coil.

The means of the earlier application is a rough rolling mill 1 and a finishing mill 6.
It is possible to obtain the effect that the rolling can be carried out continuously without performing complicated interlocking control.

However, since the welding machine clamps both the leading and trailing seat bars and performs welding while traveling, very advanced and difficult techniques are required. Since it is below the line, if the welding machine goes ahead, it will hit the rollers, so a group of swinging rollers must be used, which has the disadvantage of high equipment costs.

Therefore, it is an object of the present invention to provide a completely continuous rolling array using sheet bar joining, which can easily perform joining by fixing a welding machine and can reduce equipment costs.

The structure of the present invention will be explained in detail based on the embodiment shown in FIG. 2. A coil box 3 is provided downstream of a rough rolling mill 1, and a rough rolled sheet bar 2 is wound around a coil 4. There is. A shear 7 is installed downstream of this coil box 3, and a welding machine 8' is fixed in front of it. This welding machine 8' is provided with a holding device 8a for holding the tail end of the leading seat bar 5' and a holding device 8b for holding the leading end of the trailing seat bar 5. A looper device 11 is installed in front of the welding machine 8'. A pair of pinch rolls 12 and 13 are installed before and after this looper device 11, respectively, and a finishing mill 6 is installed in front of the front pinch roll 12.

The present embodiment is constructed as described above, and the sheet bar 2 roughly rolled by the rough rolling mill 1 is wound up in the coil box 3 to form a coil 4. After this coil 4 is moved, it is rewound to form a sheet bar 5, and its leading end is cut to adjust the end shape. And welding machine 8', looper device 11
It is then rolled by a finish rolling mill 6. Then, as the rolling work of the preceding sheet bar 5' progresses and the tail end comes to be located near the shear 7, the looper roll of the looper device 11 is raised to perform looping. The amount of loops at this time may be determined to allow for a margin until welding of the trailing seat bar 5 is completed. Then, the tail end of the leading seat bar 5' is cut by the shear 7 to prepare the end, and then the tail end is held by the tail end holding device 8a of the welding machine 8', and the leading end of the trailing seat bar 5 comes. wait for. On the other hand, the trailing seat bar 5 has a coil 4 manufactured in the same manner as described above.
Start rewinding and shear the leading end to 7.
The leading end is held by the leading end holding device 8b, and then welding is performed.

During the above operations, finish rolling continues;
The sheet bar is fed by lowering the looper roll. After welding, the looper roll is completely lowered and the trailing sheet bar 5 is continuously fed to the finishing mill.

In the above embodiment, the sheet bars are stored using the looper device 11, but the present invention is not limited to this, and various storage devices can be used.

The present invention has the above-described structure and operation, and since the sheet bar that has been roughly rolled in the rough rolling mill 1 is once wound into a coil, the amount of temperature drop can be minimized, and the sheet bar that has been roughly rolled in the rough rolling mill 1 can be The temperature on the entry side of the rolling mill can be kept almost constant, and good rolling can be performed.

Furthermore, since the leading and trailing seat bars can be welded together using a fixed welding machine, advanced technology is not required, and equipment costs can be significantly reduced.

Furthermore, since the sheet bars are stored with plenty of room in the storage device 11, heat retention is better than when spread out on a table as in the past, and the distance between the rough rolling mill and the finishing mill can be shortened. can do.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the hot rolling line of the earlier application;
The figures each show a schematic view of an embodiment of a completely continuous rolling arrangement array with sheet bar joining according to the present invention. In the figure, 1 is a rough rolling mill, 3 is a coil box,
5 and 5' are sheet bars, 6 is a finishing mill, 7 is a shear, 8' is a stationary welding machine, and 11 is a storage device.

Claims (1)

[Claims] 1. A coil box, a device for moving and unwinding the coil after being wound in the coil box, a shear, a stationary welding machine, a sheet bar storage device, and a finishing rolling mill were installed sequentially along the line from the rough rolling mill. Completely continuous rolling arrangement row with sheet bar joints.