JPS58112601A - Perfect continuous rolling disposition train by joining of sheet bars - Google Patents

Abstract

PURPOSE:To make the execution of welding of sheet bars possible without moving a welding machine and to reduce the equipment costs of a continuous rolling device in the stage of continuous rolling of sheet bars by interposing a looper between the welding machine for the sheet bars and finishing mills. CONSTITUTION:A sheet bar 2 rolled with a roughing mill 1 is coiled in a coil box 3 and the preceding end of the sheet bar 5 which is uncoiled and removed from a coil 4 is cut with a shear 7 to trim the shape of the end part. When the succeeding end part of the preceding sheet bar 5' comes near the shear 7, the looper rolls of a looper 11 are moved upward to loop the sheet bar. The succeeding end of the sheet bar is cut with the shear 7 to trim the shape of the end part. In the stage of welding the succeeding end of the preceding bar 5' and the preceding end of the succeeding bar 5 with a welding machine 8', the looper rolls of the looper 11 are moved downward whereby the welding is made possible with the machine 8' which is held fixed without moving, without stopping finishing mills 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fully continuous rolling arrangement with sheet par joints.

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 is discontinuous rolling in which one slab is rolled at a time, and has the drawbacks of poor efficiency and poor quality.

Therefore, continuous hot rolling equipment, which joins the sheet par after rough rolling to the preceding sheet bar during finish rolling and continuously rolls the joined sheet bar, has been adopted, dramatically improving rolling efficiency. did.

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 There was also the problem that it also became larger.

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 using a coil pock 3 known as a so-called Stelco coil box, shifts the position of this coil 4, and then unwinds it. The leading end and the tail end of the sheet bar 5 and the preceding sheet bar 5' which have been finished rolled in the finishing mill 6 are cut by a shear 7 to adjust the end shape. Then, move the welding machine 8 along the rail 9 to the seat bar 5.
’ while moving at the same speed as ’. The joined sheet bar passes through a group of swing rollers 10 and is finished rolled by a finishing mill 6 to become a hot strip coil.

The means of the prior application described above has the advantage that rolling can be carried out continuously without performing complicated interlocking control of the rough rolling mill 1 and the finishing mill 6.

However, since the welding machine clamps both the leading and going-back seat bars and performs welding while traveling, very advanced and difficult technology is required, and in history, the lower clamping device of the welding machine was used. Since it is located below the seat bar bus 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, an object of the present invention is to provide a completely continuous rolling array using sheet bar joining, which can easily perform joining by fixing a welding machine and can reduce monthly 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 in front of a rough rolling mill 1 to roughly roll a rolled roll 2 (/L).

A shear 5 is installed in front of the shear 3, and a welding machine 8' is fixed in front of it. This welding machine 8' is provided with a holding device 8'a for holding the tail end of the leading/doper 5' and a holding device 8b for holding the leading end of the trailing seat bar 5. A looper device 11 is placed in front of the welding machine 8'.
is installed. A pair of pinot 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.

This embodiment is constructed as described above, with the rough rolling mill 1
The sheet bar 2 that has been roughly rolled is wound in a coil box 3 to form a coil 4. After moving this coil 4,
It is rewound to form a sheet bar 5, and its leading end is cut to adjust the end shape. Then, it is rolled by a finishing mill 6 via a welding machine 8' and a looper device 11. Then, as the rolling work of the preceding sheet bar 5' progresses and the tail end comes to be located near the /yaar 7, the looper roll of the looper device 11 is raised to perform looping. At this time, the loop may be adjusted to allow for a margin until welding of the trailing seat bar 5 is completed. Then, trim the end with the shear 7 by cutting the tail end of the leading jet knife <-5', and then hold and hold the tail end with the tail end holding device 8a of the welding machine 8', and then Wait for the leading ending of 5 to come. On the other hand, start unwinding the trailing seat bar (-5 is the coil 40 manufactured in the same manner as described above), cut the leading end with yarn 7, look at the end, and attach it to the tail end of the leading sheet bar 5'. After butting and holding the leading end with the leading end holding device 8b, welding is performed.

During the above operation, finish rolling is continued and 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 by the looper device 11 in the above embodiment.
Although the description has been made to store Dopar, the present invention is not limited thereto, and a volumetric storage device may be used.

The present invention has the above-described configuration and operation, and since the sheet bar rough rolled in the rough rolling mill 1 is wound around the -H coil, the amount of temperature drop can be minimized, and The temperature on the entry side in step 6 can be kept almost constant, and good rolling can be performed.

In addition, since the leading and trailing seat bars can be welded together using a solid W type welding machine, advanced technology is not required, and equipment costs can be greatly reduced.

Historically, the sheet bars are stored with plenty of room in the storage device 11, so they have better heat retention compared to the conventional case where they are spread out on a table, and the distance between the rough rolling mill and the finishing mill can be shortened. can do.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a hot rolling line according to the prior application, and FIG. 2 is a schematic diagram of an embodiment of a completely continuous rolling array using sheet bar joining according to the present invention. In the figure, 1 is a rough rolling mill, and 3 is a coil pock. 5.5' is a run bar, 6 is a finishing rolling mill, 7 is a shear,
8' is a stationary welding machine, and 11 is a storage device.

Claims (1)

[Claims] A completely continuous rolling arrangement line using sheet par joints characterized by installing a coil bolt, shear, fixed welding machine, sheet bar storage device, and finishing rolling mill sequentially along the line from a rough rolling mill.