JPS60162556A - Continuous casting device for thin plate - Google Patents

Abstract

PURPOSE:To maintain the accuracy at the end faces of rolls and to enable stable continuous casting with a casting device of a twin drum type by disposing freely attachably and detachably collars consisting of the same material as the material of the rolls in the sliding parts between the end faces of the rolls and stationary gates. CONSTITUTION:Collars 8 formed of the same or equal material as or to the material of horizontal rolls 1, 1' (for example, a copper alloy or steel material) are disposed freely attachably and detachably in the sliding parts between the end faces of the rolls 1, 1' and stationary gates 2, 2', thereby constituting the titled device of a twin drum type. The above-described twin drum type method is a method for pouring a molten metal 4 into the space formed of the rolls 1, 1' and the gates 2, 2' and obtaining a thin plate 3. The end faces of the rolls 1, 1' are easily exchanged by the above-mentioned device, by which the end faces of the rolls 1, 1' are maintained always with good accuracy and the plate 3 is stably and continuously cast.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a continuous thin plate casting apparatus, and particularly to a twin drum type continuous thin plate casting apparatus.

[Conventional twin-drum continuous casting machine and its disadvantages]

A twin-drum continuous casting machine that continuously casts thin plates by pouring molten metal into a space created by two internal water-cooled rolls and two fixed weirs pressed against the end faces of the rolls, solidifies the molten metal on the fixed weir wall. It is important to prevent or prevent the solidified material solidifying on the fixed weir wall surface from interfering with casting. For this reason, the fixed weir wall surface is preheated to a fairly high temperature before casting, but the temperature of the part pressed against the roll end drops and a solidified product is formed in this part. If this solidified material adheres to and grows on the fixed weir wall surface, it not only significantly impairs the properties of the slab, but also causes damage to the roll ends. Furthermore, the end of the roll comes into contact with the high-temperature fixed weir, causing thermal deformation, etc., which creates a clearance between the roll and the fixed weir, which may cause breakout.

[Object of the present invention]

Therefore, the present invention provides a thin plate continuous casting apparatus that can always accurately maintain the roll end face that has been damaged by solidified material or thermal deformation by creating a structure that allows the roll end face that contacts the fixed weir to be easily replaced. The purpose is to provide

A further object of the present invention is to provide a continuous thin plate casting apparatus that can prevent operational failures such as breakouts and perform stable casting.

[Configuration of the present invention]

The present invention, as a means for achieving the above object, resides in that a thin plate (calan) made of the same material as the roll or the same material as the roll is removably disposed on the end face of the roll.

That is, the present invention consists of two water-cooled rolls that are arranged horizontally in parallel with a gap corresponding to the thickness of the metal strip to be manufactured, and that rotate in different directions. Pour the molten metal into the space formed by two fixed weirs,
A continuous casting device for producing thin plates, characterized in that thin plates (collars) made of the same or equivalent material as the rolls are removably disposed on the roll end faces, fixed weirs, and sliding parts. It is a device.

Hereinafter, the present invention will be explained in detail based on FIGS. 1 and 2. FIG. 1 is a longitudinal cross-sectional view of a thin plate continuous casting apparatus which is an embodiment of the present invention, and FIG. 2 is a detailed view showing a collar attached to the end of a roll which is also an embodiment of the present invention.
FIG. 2(a) is a plan view thereof, and FIG. 2(b) is a side view thereof.

The equipment shown in Figure N1 includes water-cooled casting rolls 1 and 1' for casting thin plate slabs 3, side solid layer weirs 2 and 2' for preventing leakage of molten metal 4 between the water-cooled casting rolls 1 and 1', and molten metal at the molten steel temple. The main components include a tandish 5 that stores 4. Regarding this device in detail, a water-cooled casting roll 1.1
' is installed horizontally and is driven to rotate (in the direction of the arrow) by a drive device (not shown). This water-cooled casting roll 1.
1' is made of, for example, copper, copper alloy, or steel, has a water cooling mechanism inside, and has a fairly large diameter roll in order to have a large contact area with the molten metal 4. Fixed weirs 2, 2' for sealing the sides are pressed against both ends of the water-cooled casting rolls 1, 1'.

The fixed weirs 2, 2' are heated to a considerably high temperature (1250°C) by heating the upper part of the refractory material 2a on the front side of the fixed weir 2 from the back side as shown in Figure 2 (a) and (→).
above). Two water-cooled casting rolls 1,1
The molten metal 4 is placed in the space formed by the fixed weir 2゜2'
The poured molten metal 4 comes into contact with the surfaces of the water-cooled casting rolls 1, i/, and Q and is cooled, and the solidified shell formed is integrated into a slab 3. This slab 6 is pulled out by a vinyl roll 6. In addition, in Figure 1, 7
is a chitrol, and in Figure 2), 2
a is a refractory material, such as boron nitride, silicon nitride (8
i3N4), 2b is ordinary fireproof castable,
For example, it is alumina, and the fixed weir 2 is formed by the refractory material 2a and the refractory castable 2b.

As shown in Fig. 2 0) and 2), the present invention provides that the sliding parts where the water-cooled casting rolls 1, 1' and fixed weirs 2, 2' contact are made of the same material as these rolls 1, 1', or the same material. By attaching the collar β made of a ring-shaped thin plate made of the same material, the collar 8 is protected against damage to the drum caused by solidified matter and thermal deformation caused by the fixed weir. Therefore, by replacing the collar 8, stable casting can be performed.

Although the present invention has been described in detail above, the present invention will be explained in more detail by giving specific examples of the present invention.

〔Concrete example〕

The dimensions and various conditions of the structural members in the case of casting steel are as shown below.

(1) Water-cooled cast roll made of steel with internal water cooling system, roll diameter 2000wφ,
A water-cooled casting roll with a roll width of 1200 m is used. The slab dimensions are 3W+1200m width, and the roll rotation speed (casting speed) is about 28m/min.

(2) Ring-shaped thin plate (collar) The material and quality of the collar was a steel collar that was the same as the casting roll.The thickness of the collar was 151111t% width SOx, and it was an integral ring.The collar was It was connected to the end of the drum with bolts.

(3) Fixed weir The fixed weir refractory is made of poron nitride (BN) and has a plate thickness of 20I+I+lt. This refractory was preheated to about 1300°C using an electric heater.

(4) Molten metal In the case of ordinary steel, the temperature of the molten metal in the tundish is approximately 155
It is 0°C.

Casting was carried out under the above conditions, and stable operation was possible without any operational troubles at Breakout Temple.

[Effects of the present invention]

Conventional equipment has the disadvantage that the ends of the roll are damaged due to the coagulation that forms on the wall surface of the fixed weir, but in the present invention, as detailed above, the thin plate (collar) is removably disposed. Therefore, the thin plate (collar) is subjected to the above-mentioned damage, and as a result, the life of the water-cooled roll is greatly increased. In addition, in the conventional device, there is a drawback that the water-cooled roll is thermally deformed due to the fixed weir, but in the present invention, this drawback can be overcome by attaching a thin plate (collar). This has the effect that troubles such as breakouts do not occur and stable casting operations are possible.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a continuous thin plate casting apparatus according to an embodiment of the present invention, and FIG. 2 is a detailed view showing a collar attached to the end of a roll according to an embodiment of the present invention. Figure 2(b) is its plan view, and Figure 2(b) is its side view. 1.1'... Water-cooled casting roll 2.2'... Fixed weir 2a... Refractory material 2b... Refractory castable 3... Slab 4... Molten metal 5... Tundish 6...・Pinch roll 7...Guide roll 8...Color Figure 1 Figure 2 (A) Figure 2 (B)

Claims (1)

[Claims] Two water-cooled rolls that rotate in different directions and are installed horizontally with a gap corresponding to the thickness of the metal strip to be manufactured;
In a continuous casting machine that obtains a thin plate by pouring molten metal into the space formed by two fixed weirs pressed against the end face of the water-cooled roll, the sliding part between the roll end face and the fixed weir is made of the same material as the roll material or A thin plate continuous casting device characterized by a thin plate (collar) made of the same material arranged in a detachable manner.