JPH0418934B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in twin roll continuous casting machines.

In recent years, various methods (twin roll method) have been proposed for continuously casting strip-shaped plates using a twin roll continuous casting machine. Continuous casting using such a twin roll method was the first
To explain with a diagram, cooling rolls 1 and 2 whose inner surfaces can be water-cooled are arranged horizontally and in parallel, and a barrel seal 3 is placed on the cooling rolls 1 and 2.
The cooling rolls 1 and 2 are rotated by a required drive device while continuously supplying molten steel 4 into a barrel formed by side seals (not shown), and the steel is cooled by the surfaces of the cooling rolls 1 and 2. The solidified layer 5 thus formed is formed into a plate shape and pulled out from between the cooling rolls 1 and 2.

The strip-shaped plate 6 is continuously cast as described above, but in this case, it is difficult to keep the length of the solidification section of the cooling rolls 1 and 2 constant, so the plate thickness becomes uneven and breakouts occur. The problem is that it is easy to do.

In view of the above, the present invention provides a continuous casting machine that can control the length of the solidification section by making the cooling roll offset in the direction of drawing out the board or in the opposite direction, thereby producing a board with a constant thickness. It was done for the sake of

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

FIG. 2 shows an example of the present invention, in which the continuous casting machine of FIG. The center position C of the cooling roll 2 can be offset in the direction opposite to the board drawing direction 11 by moving the center position C of the cooling roll 2 by the same distance in the vertical direction within the window 9 by the hydraulic cylinder 10. A load cell 13 is provided between them so that the rolling load on the cooling roll 2 can be measured, and an arithmetic device 15 that compares the measurement signal from the load cell 13 and the setting signal 14, and as a result of the calculation by the arithmetic device 15, A control device 16 is provided to control the hydraulic cylinder 10 to raise the cooling roll 2 when the load is below a set value, and to lower the cooling roll 2 when the load is above the set value. By offsetting the center position C of the roll 2, the solidification section lengths l and l' are controlled. Center position before offset
Indicated by C′.

As described above, since the solidification zone lengths l and l' on the surfaces of the cooling rolls 1 and 2 can be controlled, it is possible to cast the plate 6 of uniform thickness and to prevent breakouts from occurring.

It should be noted that the present invention is not limited to only what is shown in the above embodiments; for example, in the above embodiments, the thickness of the roll outlet side is predicted by measuring the rolling load, and the cooling roll is offset based on this. However, a thickness gauge may be provided on the exit side of the roll to directly measure the plate thickness, and the cooling roll may be offset based on this measurement result. Also, in the above embodiment, one cooling roll is offset. However, both cooling rolls may be made to be offset, or further may be made to be offset in the direction of sheet withdrawal, and various other changes may be made without departing from the gist of the present invention. Of course.

According to the present invention, since the length of the solidification zone on the surface of the cooling roll can be controlled as described above, it is possible to produce a plate with a constant thickness, and it is possible to achieve the excellent effect of preventing the occurrence of breakout.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional continuous casting machine, and FIG. 2 is an explanatory diagram showing an outline of the continuous casting machine of the present invention. 1, 2... Cooling roll, 4... Molten steel, 5...
Solidified layer, 10... Hydraulic cylinder, 11... Board pulling direction, 13... Load cell, 15... Arithmetic device, 16... Control device, l, l'... Solidification section length.

Claims (1)

[Claims] 1. An offset device that offsets at least one of the cooling rolls in the direction of sheet drawing or in the opposite direction in a continuous casting machine that guides molten steel between two cooling rolls that rotate facing each other and pulls it out in the form of a plate from the gap between the rolls. A continuous casting machine characterized by being equipped with.