JPS6243782B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous casting device for continuously casting molten metal, which is particularly suitable for producing thin and wide slabs and capable of high-speed casting, and has a mold composed of a belt and a fixed side plate. This invention relates to a synchronous continuous casting device.

In recent years, there has been a demand for higher casting speeds in the field of continuous casting. In particular, there is a strong desire to establish a technology for producing wide slabs from molten steel at high speed. If this can be realized, it will be possible to match the processing capacity of the equipment before and after the casting equipment, and the effects will be significant, such as a reduction in equipment costs and maintenance personnel, as well as a significant improvement in productivity. The inventors have proposed the arrangement and configuration of the mold,
This was achieved by cleverly combining the support and cooling functions of molten metal static pressure. That is, a pair of curved opposing fixed side plates forming the wall surface on the short side of the cast strip, and the fixed side plates forming the wall surface on the long side of the cast strip are sandwiched from inside and outside along the curved surface while the above-mentioned We have proposed a synchronous continuous casting device comprising a pair of stretched movable strips that move in synchronization with the slab, and a device for supporting and cooling the movable strips on the back side of the movable strips. ing.

However, a pair of movable strips slide in contact with both sides of the fixed side plate of this synchronous continuous casting device.
Although it has the function of preventing leakage of molten steel, the thickness of the wide slab is also determined by the thickness of its fixed side plate and the movable strip forming the long side wall surface. In addition, a high-speed hydrostatic bearing is installed on the back of this movable strip, and it is supported by the static pressure of cooling water commensurate with the static pressure of molten steel, and at the same time, the movable strip is effectively cooled by the flow of cooling water. be. However, the static pressure of the cooling water must be set equal to or slightly higher than the static pressure of molten steel, which varies depending on the height above the molten metal surface, to prevent leakage. It is important that this is set appropriately.
For this reason, in the past, the fixed side plate was positioned and fixed so that it was centered between the hydrostatic bearing surfaces on both sides, but the characteristics of the hydrostatic bearing are resistant to changes in gap as shown in Figure 4. Since the generated static pressure changes sensitively, it takes a long time to set the distance between the static pressure bearing surfaces and the positioning of the stationary side plate. Since changes occur in the system, it is necessary to periodically correct and reset the settings, which has practical disadvantages such as requiring a long time for maintenance and readjustment.

The purpose of the present invention is to solve such practical obstacles such as assembly, maintenance, and adjustment, and to provide a synchronous continuous casting machine that is extremely easy to assemble, maintain, and adjust due to a self-resetting fixed side plate mechanism. There is something to do.

The present invention includes a pair of curved opposing fixed side plates forming a wall surface on the short side of the cast slab, and a pair of fixed side plates that form a wall surface on the long side of the cast slab, and is sandwiched between the fixed side plates from inside and outside along the curved surface. In the mold device, the casting area is constituted by a pair of stretched movable belt-shaped bodies that move in synchronization with the slab, and the mold apparatus is characterized in that a stationary side plate is supported movably in the thickness direction of the slab.

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

Molten steel 2 in a tundish 1 is continuously poured into a mold through a nozzle 3. The short side of the mold is formed by a pair of fixed side plates 30, 31 which are formed into a gradually increasing curve so that the slab 28 can be shaped into a curved shape, as shown in FIG. The curvature varies depending on the scale of the equipment, but by appropriately selecting it, a mold having the necessary slab cooling length can be constructed.

The long sides of the mold are used to hold the fixed side plates 30 and 31 along the curved surfaces from the inside and outside, and then insert the slab 2 into the mold.
It is formed by a pair of movable belt-like bodies 4 and 5 that move in synchronization with the belt-shaped body 8. The movable strips 4, 5 are supported movably on rollers 6, 7, 8 and 9, 10, 11 and are tensioned by springs 12, 13. It should be noted that each of the movable strips 4, 5 can be configured to actively move in synchronization with the slab by a drive device (not shown), if necessary.

Hydrostatic bearing devices 14, 15 are provided on the back surface of each movable strip 4, 5 corresponding to the mold wall surface for cooling the strip and supporting load. 1
4', 15' are support frames, and the hydrostatic bearing 1
4 and 15 are supported and fixed.

These static pressure bearing devices 14 and 15 are arranged in the movable belt-shaped body 4,
It is arranged so as to be able to support and cool the strip over almost the entire casting area defined by 5, and has water chambers 16 and 17 inside, respectively.
Pockets 18 and 1 are located opposite the movable strips 4 and 5.
9 is formed. The water chamber and the pocket communicate with each other through a large number of nozzles 20 and 21. During casting, by introducing high-pressure cooling fluid from the outside into the water chambers 16 and 17, the high-pressure cooling fluid flows from the nozzles 20 and 21 to the pockets 18 and 1.
9 and the movable belt-like bodies 4 and 5, and is further discharged in the width direction as shown by the arrow in FIG. During this flow process, a thin fluidized layer of the cooling fluid is formed between each of the movable strips 4, 5 and the static pressure bearing devices 14, 15, and static pressure is generated due to the flow resistance, which causes each fixed side plate 30, 31 and the movable belt-like body 4,
5 and support the static pressure of the molten steel, and also effectively cools the movable strips 4 and 5. The springs 12 and 13 are arranged between the protruding members 22 and 23 and the roll supports 24 and 25, respectively.

Now, in order to obtain a wide slab with a thickness H as shown in Fig. 3, the distance between the hydrostatic bearings 14 and 15 is L=H+2t+
It must be set to 2G (t=thickness of the movable strip, G=gap through which fluid flows). Also fixed side plate 3
Since the thickness H ₀ of 0 is approximately equal to the width H of the slab, in order to exert the static pressure of the static pressure bearings 14 and 15 against the static pressure of molten steel, the movable strip 4 must be moved as shown in FIG. , 5 must be set to an appropriate gap G on both back surfaces. In this embodiment, the fixed side plates 30, 31 are attached to the guides 38, 39 and the support plates 32, 33 which are slidable on the guide pin 3, so that a gap G is formed that balances the static pressure of the molten steel. , followed by the fixed side plates 30,3
1 comes to an optimal position and stands still. The springs 36 and 37 are used to provide the fixed side plates 30 and 31 with a self-returning action and to prevent excessive force from being exerted between the fixed side plates 30 and 31 and the movable strips 4 and 5.

In the present invention, the means for moving the stationary side plate is parallel movement using guide pins, but it goes without saying that other specific means such as link support may be used.

Since the present invention is constructed as described above, assembly, maintenance, and adjustment of parts are extremely easy, and a significant improvement in operating efficiency is achieved.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a synchronous continuous casting machine according to the present invention, Fig. 2 is a detailed cross-sectional view taken along line AA in Fig. 1, Fig. 3 is a detailed view showing the mechanism of the present invention, and Fig. 4 is a detailed view of the synchronous continuous casting machine according to the present invention. It is a characteristic diagram of a hydrostatic pressure bearing. 2... Molten steel, 4, 5... Movable band-shaped body, 14, 15...
Hydrostatic bearing device, 14', 15'...support frame.

Claims (1)

[Claims] 1 A pair of curved opposing fixed side plates forming a wall surface on the short side of the cast strip, and the fixed side plates forming a wall surface on the long side of the cast strip are sandwiched from the inside and outside along the curved surface while the above casting is made. A synchronous continuous casting device in which a casting area is constituted by a pair of stretched movable strips that move in synchronization with a cast piece, characterized in that a stationary side plate is supported movably in the thickness direction of the cast piece. .