JPS60127048A - Width changing method in continuous casting machine for hoop - Google Patents

Abstract

PURPOSE:To assure the technique for changing width and to improve the versatility and working efficiency of a continuous casting machine for a hoop provided with gates slidable with the surface of a casting mold by using an auxiliary plate on the inside of the part of both gates in contact with the surface of the casting mold. CONSTITUTION:An auxiliary plate 6 consisting of a refractory material having a required thickness and the bottom end shaped in such a way as to engage with the surface of one roll is thoroughly preheated and is inserted and pressed from above to the inside part in the side guide part 3 contacting with the surfaces of cooling rolls 1, 1. A mash layer is collapsed with pressing of the plate 6 and no more molten metal is supplied under the plate 6 so that no more fresh solidified shell is generated between the plate 6 and the surface of the roll 1. The plate 6 is moved upward by as much as the thickness of the solidified shell on the roll 1 not in contact with the plate 6 upon lapse of suitable time so that the rolls 1, 1 can be moved in the counter arrow X direction by as much as the thickness of the plate 6. The above-mentioned operation is repeated until a hoop 5 attains a prescribed width.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a width changing method in a strip continuous casting machine such as a twin roll type continuous #R making machine or a belt type continuous casting machine.

The most common method for producing strips, which is still in use today, is to cast a thick slab using a continuous slab casting machine and roll it through a separate rolling line for 5 to 10 minutes.
It is rolled 0 times or more to make it thin, and then finished rolled to produce a strip.

However, in this method, it is necessary to heat the slab and control the temperature to a constant temperature for rolling, and a large amount of rolling energy and heating energy are required.

Under these circumstances, a twin-roll type continuous strip casting machine has been proposed that can directly cast strips from molten metal.

In a twin-roll continuous casting machine, a pair of cooling rolls whose inner surfaces can be cooled with water or the like are arranged in parallel with a gap corresponding to the thickness of the strip to be cast, and the molten metal is poured into the gap. Both rolls are rotated so as to be guided through the gap.

There are still only a few concrete examples of such twin-roll continuous @making machines.
Related technologies are also under development. One such technique is the width changing technology for cast strips, and the width changing technology is currently undeveloped.

In view of the above circumstances, the present invention has been developed using a continuous strip casting machine with 43G.
The purpose of this invention is to provide a method for changing the width of the casting machine, and to greatly improve the versatility and operation rate of the casting machine.

Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, cold lJ rolls 1, 1 arranged in parallel are configured to be rotatable and movable in the axial direction, and furthermore, a pair of weir frames 2, 2 is slidably and liquid-tightly disposed relative to the cooling rolls 1, 1.

As is clear from the arrow view in Fig. 3, the weir frames 2, 2 each have an L-shaped planar shape consisting of a side guide 3 and a barrel guide 4, and the side end surfaces of the side guides 3 are opposite to each other. are assembled so as to be in mutual sliding contact with the inner wall surfaces of the side barrel guides 4,
It is designed to move in the direction of the arrow in the figure while maintaining a liquid-tight state. Further, the lower end surface of the barrel guide 4 is an arc that engages with the surface of the cooling roll 1, and the lower end surface of the male side of the side guide 3, which is a continuous portion with the barrel guide 4, is also an arc that engages with the surface of the cooling roll 1. Yes, and also side guide 3
The lower inner surface of the protruding side is in sliding contact with the end face of the mating cooling roll 1.

When casting work is performed using a twin-roll continuous casting machine with such a configuration, the molten metal is stored in the space surrounded by the weir frames 2, 2, is cooled on the surface of the cooling rolls 1, and a solidified layer grows along the surface. As the cooling roll 1.1 is rotated, the solidified layer moves toward the gap and is eventually drawn out from the gap in the form of a strip 5.

Here, when changing the width of the strip plate 5, the cooling rolls 1, 1
The cooling rolls 1, 1 are moved alternately in the axial direction. At this time, there is no problem if the cooling rolls 1, 1 are moved in the direction of the arrow X, but if the cooling rolls 1, 1 are moved in the opposite direction of the arrow X, The solidified shell (mushy layer) that is being formed on the surface of the cooling rolls 1, 1 and the solidified shell that has already been formed will act as sliding resistance for the side guides 3, 3, and if the side guides 3, 3 are forced to slide, the collapsed solidified shell will cause the strip plate to 5 quality deteriorates.

As shown in FIGS. 1 and 2, an auxiliary plate 6 made of a refractory material such as boronite and having a required thickness and a shape such that its lower end engages with the surface of one of the rolls is attached to the cooling roll 1.1. On the inside part of the 3 side guides that are in contact with the surface,
Insert and press from above when fully preheated. By this pressing of the auxiliary plate 6, the massy layer is collapsed, and the molten metal is no longer supplied under the auxiliary plate 6, so that no new solidified shell is generated between the auxiliary plate 6 and the surface of the roll 1. Therefore, after an appropriate period of time has elapsed, the auxiliary plate 6 is moved upward by the thickness of the solidified shell on the roll 1 that is not in contact with the auxiliary plate 6, and the cooling roll 1.1 is moved in the opposite direction of the arrow X by the thickness of the auxiliary plate 6. Make it possible to move. The above operations are repeated until the strip 5 has a predetermined width.

As a result, no extra sliding resistance acts on the side guides 3.3, the cooling roll 1.1 can move smoothly, and the width of the strip 5 can be changed continuously.

Note that in the above embodiment C, the side guide 3 and the barrel guide 4 are
Although the present invention was applied to a casting machine equipped with a weir frame 2 consisting of It can also be implemented in the same way. Furthermore, the present invention can be implemented in a belt-type continuous strip casting machine as well.

As explained above, according to the present invention, it is possible to establish a width changing technique in a continuous strip casting machine, and the versatility and operating rate of the casting machine can be greatly improved, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view of a twin-roll continuous casting machine embodying the present invention, Fig. 2 is a view from the 1[-I arrow in Fig. 1, Fig. 3 is an explanatory diagram of the weir, and Fig. 4 is FIG. 5 is a schematic plan view showing an example of a twin roll continuous casting machine capable of carrying out the present invention, and FIG. 5 is a view taken along the line V--■ in FIG. 4. 1 is the cooling roll, 2 is the weir frame, 3 is the side guide, 4 is the barrel guide, 5 is the strip plate, and 6 is the auxiliary plate. Patent application Hitoshi Kawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1) In a strip continuous casting machine in which the opposing ends of movable molds arranged in parallel are provided with weirs that can slide on the surface of the other mold, an auxiliary plate is placed inside the portions of both layers that are in contact with the mold surface. A width changing method in a continuous band casting machine, characterized in that the mold is moved in a direction in which the distance between the two layers is narrowed, with the rear auxiliary plate separated from the surface of the mold by pressing to eliminate the solidified shell.