JPH028818B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dummy barless continuous casting apparatus, and particularly proposes a continuous casting apparatus that can start casting without using a dummy bar.

Conventional continuous casting equipment uses a mold surrounded by cooling boxes on four sides, or a pair of opposing endlessly moving circulating bodies (metal belts).
There is a continuous casting device that combines a fixed cooling plate and a cooling box located between them. Usually, these continuous casting devices are called dummy bars. It was inevitable to provide a mechanism for holding the molten metal at the start of casting, and for subsequently guiding and drawing out the slab.

However, the dummy bar installed in such conventional equipment is configured to be drawn out from below or above, which corresponds to the direction in which the slab is pulled out.
For this reason, for example, in the case of a type that approaches from below in the direction of drawing the slab, there is a time loss as the next casting process cannot be started until the slab is completely drawn. Therefore, conventional continuous casting apparatuses have had the disadvantage of poor operating efficiency and low productivity.

An object of the present invention is to propose a dummy barless continuous casting apparatus that can overcome the drawbacks of the conventional continuous casting apparatus equipped with the dummy bar described above.

In order to solve the above-mentioned technical problem, this invention includes a pair of opposing circulating bodies that circulate while maintaining a gap for holding molten steel over a certain distance, and a pair of opposing circulating bodies that circulate while maintaining a gap for holding molten steel over a certain distance. In a continuous casting device in which a casting space is constituted by a pair of fixed side plates located near the side edges, a bottom plate is provided at the bottom of the casting space, which is sandwiched between both circulating bodies and in liquid-tight contact with the lower end of the fixed side plates. The present invention provides a dummy barless continuous casting apparatus characterized in that the dummy barless continuous casting apparatus is disposed in such a manner that it can be put in and taken out in a direction substantially perpendicular to the direction in which the slab is drawn.

FIG. 1 shows a preferred embodiment of the apparatus of the present invention, and reference numerals 1 and 1' in the figure indicate a pair of metal belt circulating bodies that move endlessly facing each other at a predetermined interval. , 1' are respectively wound between a plurality of support rolls 3, 3',
A gap is formed to hold the cast molten steel over a certain distance. These circulating bodies 1, 1' have a surface (outer surface) opposite to the surface (inner wall surface) that contacts the molten steel.
A cooling device 4 is installed therein for cooling. Fixed side plates 2, 2' for cooling the short sides of the slab are arranged near both side edges of these circulation bodies 1, 1', and together with the circulation bodies 1, 1', they extend over a certain distance. A casting space is formed in which the molten steel is held and solidified. And the above-mentioned circulating body 1,
1', on the downstream side in the slab drawing direction, there are pinch rolls (not shown) whose spacing is adjusted to be approximately equal to or smaller than the short side surface of the slab in the casting space, or a thin steel plate with a desired thickness. A plurality of pairs of rolling rolls or the like are arranged whose distance is gradually narrowed to a considerable distance.

In the case of the present invention, in addition to the above configuration, a bottom plate 5 for holding molten steel, which is used while being sandwiched between both circulation bodies 1 and 1', is installed at the lower end of the casting space in a direction substantially perpendicular to the slab drawing direction. Place it so that it can be taken in and taken out. This bottom plate 5 is retracted during casting, but at the start of casting, it is moved laterally to the lower end position of the casting space via a cylinder 6 in the horizontal direction as shown by arrow X in the figure. Both fixed side plates 2, 2' for cooling the short sides are rotated through a rotating shaft supporting the cylinder 6 and extended in the direction shown by the arrow Y in the figure.
It is used to hold the initially poured molten steel within the casting space by making liquid-tight contact with the lower end surface.

The molten steel 8 injected through the injection nozzle 7 is cooled in contact with the circulating bodies 1, 1', the fixed side plates 2, 2', and the bottom plate 5, and forms a solidified shell in the shape of a cylindrical shell with a bottom as shown in FIG. It becomes 9. Note that a cold material 10 such as scrap is placed on the bottom plate 5 in advance in order to promote cooling of the molten steel. After the solidified shell 9 is obtained in this way, the bottom plate 5 is retracted horizontally or while being rotated, so that the solidified shell 9, that is, the slab can be pulled out. After such a state has passed, the circulating bodies 1, 1' are then moved in the direction of drawing out the slab, and the solidified shell slab is pulled out downward and guided to the pinch rolls. In this case, in the case of an extremely thin plate with a slab thickness of about 20 mm, the above-mentioned pinch rolls are not necessarily essential.

As explained above, the equipment of the present invention has lower equipment costs than the conventional dummy bar system, and it takes 40 minutes to start the next casting with the equipment that uses a dummy bar to draw slabs. However, with the dummy barless device of the present invention, the
This has the effect of significantly improving operational efficiency.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the dummy barless continuous casting apparatus of the present invention, and FIG. 2 is a partially cut away perspective view of the above-mentioned apparatus of the present invention. 1, 1'... Circulating body, 2, 2'... Fixed side plate, 3... Support roll, 4... Cooling device, 5... Bottom plate, 6... Cylinder, 7... Injection nozzle, 8... Molten steel, 9... Solidified shell (slab ), 10...Cold material.

Claims (1)

[Claims] 1 A pair of opposing circulating bodies that circulate while maintaining a gap for holding molten steel over a certain distance, and a pair of fixed side plates sandwiched between the circulating bodies and positioned near the respective side edges. In a continuous casting device having a casting space, a bottom plate is placed in the lower part of the casting space and is sandwiched between both circulation bodies and in liquid-tight contact with the lower end of the fixed side plate, in a direction substantially perpendicular to the direction of drawing out the slab. A dummy barless continuous casting device characterized by being arranged so that it can be taken in and taken out.