JPS58110161A - Continuous casting device - Google Patents

Abstract

PURPOSE:To prevent the leakage of molten metal in the starting stage of casting and to reduce the friction between a movable bandlike object and side plates during casting, by providing pressing means which press supporting and cooling means to the side plate sides in the initial period of casting when charging of molten metal is started and can relieve the pressing force after starting of drawing of an ingot. CONSTITUTION:Prior to charging, hydrostatic bearings 32, 34 are pressed with strong force to short plate sides, and a dummy bar 42 is disposed in a casting mold. In the initial period of charging of molten metal, said metal collides vigorously against the bar 42 and the splashes thereof collide against belts 3, 4 but the belts 3, 4 are kept pressed strongly to the short sides; therefore, no clearances are produced between the short side plates and the belts, and the leakage of the molten metal is prevented. When the molten metal is supplied sufficiently and arrives at a reference level 43, the force of cylinders 41 is weakened in response to said arrival and the belts 3, 4 and the bar 42 are driven, whereby casting is started.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous casting apparatus that continuously cools and shapes molten metal.

As a continuous casting machine that synchronizes the slab and the shaped body and performs continuous casting, the machine is designed to form a pair of curved opposing side plates that form the wall surface on the short side of the slab, and a wall surface on the long side of the slab. A pair of tensioned belts move in synchronization with the slab while holding the stationary side plate inwardly and outwardly along the curved surface, and define a casting area, and a back side of each of the belts. proposed a continuous casting apparatus which is provided with means for supporting and cooling the belt.

In such devices, the belt is stretched around a plurality of guide rollers and supported and cooled by, for example, hydrostatic bearings.

However, in such a device, the dynamic pressure of the molten metal ejected from the nozzle at the start of casting presses the gap between the belt and the short side, and hot water is poured into the gap.

Alternatively, there is a risk that an accident such as hot water leaking may occur.

At least as mentioned above, if hot water is inserted between the belt and the short side and creates a cast tension, the pull-out resistance of the slab will increase, making casting impossible, or if a strong pulling force is applied, the cast tension The object of the present invention is to provide a continuous casting device that can reliably prevent leakage of metal from the mold at the start of casting. in,
At the start of casting, the means for supporting and cooling the movable belt-shaped body constituting the mold is suppressed by the side plate constituting the mold, at least after the start of drawing out the slab.

Item 4 is characterized in that a suppressing means capable of alleviating the suppressing force is provided. According to this invention, it is possible to reliably prevent melt leakage at the start of casting, and also to reduce the friction between the movable strip and the side plate during casting, making continuous casting possible.

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

FIG. 1 is a diagram showing an example of a synchronous continuous casting machine, and FIG. 2 is a view taken along the line A--A in FIG. 1. The molten metal from the tundish 1 is transferred to the nozzle 2, the dowel 3.4 and the fixed short side plate 20A,
Belt 3 composed of 20B and continuously poured into nine molds
, are arranged so as to sandwich the four short-side fixed side plates 20A and 20B. Behind the belt, a hydrostatic bearing 10.11 is provided for hydrostatic support and cooling of the molten steel. That is, the hydrostatic bearing is provided with a large number of cooling water jetting holes 21, and cooling water is jetted onto the back surface of the belt. This hydrostatic bearing 10
．． 11 is supported on a pedestal 5.12. Belt 3.4
are supported by guide rollers 6.7, 9.degree. 13.14.15, and rotated as the slab 19 is cast. Note that the guide roller 9.15 is pushed out by a spring 8.16.

Proper tension is applied to the belt 3.4.

Further, the round slab 19 formed by the mold described above is bent again by bending rollers constituted by an upper bending roller group 17 and a lower bending row 2 group 18.

A detailed enlarged view of the hydrostatic bearing 10.11 is shown in FIG. In other words, the hydrostatic bearings have a split structure, and for the belt 3 located inside the curved mold, there are fixed hydrostatic bearings 30 and 31 for setting the reference position of the belt 3, and In between, a hydrostatic pressure bearing 32 is arranged which is movable with respect to the short side plate by a spring 36. On the other hand, with respect to the belt 4 located outside the curved mold #-i, the hydrostatic pressure bearing 33.34° 35 is movable by the spring 36.
It is arranged.

FIG. 4 is a view taken along the line C-B in FIG. It has become. This pressing is of course performed by the belt 3,
4. It is pressed against the short side plate side.

The operation of this embodiment will be explained below. first.

Before pouring, the cylinder 41 presses the hydrostatic pressure bearings 32 and 34 against the short side plate side with strong force. Before starting pouring,
A dummy bar 42 as shown by the broken line is arranged in the mold, and at the beginning of pouring, the molten metal violently collides with the dummy bar 42.
This rebound collides with the belt, but since the belt 3゜4 is pressed against the short side plate with a strong force during the above-mentioned operation, a large gap does not occur between the short side plate and the belt. It is possible to prevent hot water from leaking at the initial stage of pouring.

After that, after the hot water is sufficiently supplied and reaches the standard hot water level 43,
The blade of the cylinder 41 is immediately loosened, the bell) 3.4/mm 712 is driven, and casting is started.

After the melt level shown in Fig. 3 reaches the standard melt level and the tip injection hole of the nozzle 2, shown by the dotted line, hits the melt surface, the dynamic pressure of the molten steel ejected from the nozzle is reduced, and the spring shown in Fig. 3 3
4 belt 3.4 with weak force of 6 or belt 40 attachment force
and short side plate 20A.

Leakage can be prevented without creating a gap between 20B.

Of course, the initial strong pressing of the cylinder 41 may be applied to the belt supports 33 shown in FIG. 3 other than those shown in FIG. It is best to apply it to

According to this embodiment, even if the dynamic pressure of the pouring metal from the nozzle acts on the belt at the start of casting, it is possible to prevent a large gap from being generated between the short side plates of the Peltor, thereby preventing the leakage of the metal and also reducing the casting tension. This also has the effect of allowing casting to be carried out continuously at all times, since the occurrence of such problems can also be prevented. In addition, according to the above-mentioned hydrostatic bearing with a split structure, since the fixed hydrostatic bearing is provided, the overall shape of the belt support can be kept almost constant, and moreover, it is possible to maintain a substantially constant overall shape of the belt support, and moreover, it is possible to maintain a large number of short lengths in the direction of drawing out the slab. Since it uses a movable hydrostatic bearing, even if the short side plate is thermally deformed, it can sufficiently follow this deformation, thereby reducing the change in the gap between the belt and the short side plate and applying tension. Since the fixed hydrostatic bearing can support the force acting on the belt 4 toward the inside of the curved mold, that is, toward the belt 3, the gap between the belt 3 and the short side plate can be further reduced.

In the above embodiment, the short side plate is fixed, but it goes without saying that the short side plate may be of the movable type.

According to the present invention, it is possible to provide a continuous casting apparatus that can reliably prevent melt leakage at the start of casting.

[Brief explanation of drawings]

Fig. 1 is an overall view of a continuous casting apparatus showing one embodiment of the present invention, Fig. 2 is a view taken along the line A-A in Fig. 1, Fig. 3 is an enlarged view of a support cooling body for a belt, and Fig. 4 is an enlarged view of a support cooling body for a belt. The figure is a view taken along the line B-B in FIG. 3. 3.4... Belt, 10.11... Hydrostatic pressure bearing,
20A. 20B... Side plate, 30.31... Fixed hydrostatic bearing. 32.33, 34.35...Movable hydrostatic bearing. IQ 2+

Claims (1)

[Claims] 1. A pair of curved opposing side plates forming the wall surface on the short side of the slab, and the side plates being sandwiched inside and outside along the curved surfaces to form the wall surface on the long side of the slab. A pair of stretched movable strips that move in synchronization with the movable strips define a casting V area, and a means for supporting and cooling the movable strips is provided on the back surface of each of the movable strips. In the continuous casting apparatus, the supporting/cooling means is pressed against the side plate in the initial stage of casting when pouring is started, and at least one bale from which pulling is started is provided with a suppressing means capable of relieving the suppressing force. A continuous casting device characterized by being provided with.