JPH03189051A - Twin roll type continuous casting machine and method for starting pouring of molten metal with this roll type continuous casting machine - Google Patents

Abstract

PURPOSE:To prevent the development of solidified shell at inner side face of side weir and cutting of a strip by pre-heating the side weir till just before supplying molten metal from a ladle. CONSTITUTION:A truck 14 is shifted to casting position below the ladle 1 along the guide rail 16 with a cylinder 17 to position a tundish 4 below a nozzle 2 in the ladle 1. After that, the preheated side weir 7 is set at both end side part to axial direction of casting rolls 6, 6'. By this method, the side weir 7 is under high temp. condition, and the development of solidified shell at inner side face in the side weir 7 can be prevented. Therefore, the development of cutting phenomenon of strip can be prevented and the metal strip is continuously cast.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a twin-roll continuous caster and a method for starting pouring using the twin-roll continuous caster.

[Prior Art] Currently, there is a twin roll type continuous casting machine as shown in FIG. 3, for example.

In the figure, 1 has a nozzle 2 for discharging molten metal (molten metal) on the lower surface and an opening/closing plate 3 for opening and closing the nozzle 2, and 4 has a nozzle 2 located below the ladle 1. A tundish is supplied with molten metal from a drum 1 through a nozzle 2, and 5 is a pair of water-cooled casting rolls 6.6° whose facing surfaces rotate downward (in the direction of the arrow) and the axial direction of the casting rolls 6.6°. A core, IO, which supplies the molten metal 9 from the ladle 1 to the pool 8 formed by the side weirs 7 disposed at both end sides.
The solidified shell 11 formed when the molten metal 9 is cooled by the casting rolls 6.6' is drawn downward from the gap G formed at the facing portion of the casting rolls 6, 6', thereby producing the cast slab 12. Guide rolls 13 are pinch rolls that pull out the slab 12 at a required speed.

In the above-mentioned twin roll continuous casting machine, when starting casting, conventionally the cider 1 is heated in a heating furnace (not shown).
1. Preheat the tanning tray 4, core 5 and side weir 7,
After that, the casting roll 6.8 is first installed in the casting place.
Side weirs 7 were arranged on both axial end sides of the tundish 4, and then the core 5 and tundish 4 were set 6.6° above the casting roll in that order, and then the ladle 1 was set above the tundish 4. .

[Problem to be solved by the invention] Conventionally, the side weir 7, core 5, tundish 4, and ladle I are set in the above order, so the side weir 7 cools down before pouring starts. As a result, a solidified shell is formed on the inner surface of the side weir 7 (the surface in contact with the molten metal) by the cooled side weir 7. After the start of casting, this solidified shell is pulled by the solidified shell 11 formed on the surface of the casting roll 6.6゜ and falls off the inner surface of the side weir 7, and the fallen solidified shell falls between the gap G of the casting roll 6.6゜. When passing through the gap G, the gap G is suddenly opened by being pushed by the solidified shell that has fallen off, and a plate breakage phenomenon occurs in the slab 12, so that continuous casting cannot be performed.

The present invention has been made in view of the above-mentioned circumstances, and includes a twin-roll continuous casting machine and a method for starting pouring using the twin-roll continuous casting machine, which can prevent plate breakage during casting and ensure continuous casting. The purpose is to provide the following.

[Means for Solving the Problems] The first invention includes a pair of casting rolls that are arranged in parallel at a required interval on a horizontally movable cart, and whose facing surfaces rotate downward. , a side weir that can be disposed on both axial end sides of the pair of casting rolls, a core that can be installed on the trolley so as to be located above the opposing gap between the pair of casting rolls, and an upper end of the core. A twin-roll continuous casting machine characterized by comprising: a tundish that can be connected to and installed on the trolley; and a tundish that can be installed above the pair of casting rolls set at a casting position. It is something.

In addition, the second invention provides a pool formed by side weirs disposed on both axial end sides of a pair of casting rolls that are disposed in parallel with a required interval and whose facing surfaces rotate downward.
The molten metal is supplied from the ladle through the tundish and the core, the molten metal is cooled by the pair of casting rolls to form a solidified shell, and the solidified shell is placed below the gap formed between the facing surfaces of the pair of casting rolls. In a twin-roll continuous casting machine that performs casting by drawing at least once, the ladle is set at the casting position after at least preheating, and then the gap formed between the facing surfaces of a pair of casting rolls positioned at a location other than the casting position is A preheated core and a preheated tundish are placed on the upper side, and then the pair of casting rolls, the core, and the tundish are moved together and set at the casting position below the ladle, and then the pair of casting rolls are moved. This invention relates to a method for starting pouring using a twin-roll continuous caster, which is characterized by setting preheated side weirs on both axial end sides and pouring the metal.

[Function] Since the side weir can be set last, the temperature drop in the side weir until pouring is started is small, and no solidified shell is formed on the inner surface of the side weir. Therefore, after the start of casting, the gap between the pair of casting rolls is widened, thereby preventing sheet breakage from occurring.

[Example] Embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows an embodiment of the twin roll continuous casting machine of the present invention.
The same reference numerals as in FIG. 3 indicate the same parts.

In the figure, reference numeral 14 denotes a truck that rotatably holds a pair of water-cooled casting rolls 6.6'' at a required interval.
is movably mounted on a guide rail 16 via wheels 15, and the tip of a piston rod 18 of a cylinder 17 arranged as appropriate is connected to the above-mentioned truck 14. The trolley 14 moves on guide rails 16.

A frame body 19 is provided on the upper surface of the truck 14, and the frame body 19 is provided with a recess 19a for inserting the protrusion 4a of the tundish 4 from above and supporting the tundish 4. , a support member 20 for supporting the core 5 in the same manner as the tundish 4 is provided inside the frame 19.

Next, a method for starting pouring using the above-mentioned twin roll type continuous casting machine A of the present invention will be explained with reference to FIGS. 2A, 2B, and 2C.

First, the preheated ladle l is set at the casting position. The cylinder 17 pulls out the cart 14 and casts the roll at 6.6°.
is located at a location other than the casting position, and a preheated core 5 is formed on the facing surface of the casting roll 6.6°, which supplies molten metal 9 between the casting rolls 6.6°. A support member 20 is attached to the frame structure 19 so as to be located above the gap G.
A preheated tandish 4
, the protrusion 4a is placed above the core 5 of the frame 1.
9 and supported by the bridge body 19 (state shown in FIG. 2 (e)).

Next, the carriage 14 is moved to the guide rail 1θ by the cylinder 17.
2 to the casting position below the ladle 1, and position the tundish 4 below the nozzle 2 of one dollar (FIG. 2(B)).

Thereafter, preheated side weirs 7 are placed on both axial ends of the casting roll at 6.6° (the state shown in FIG. 2(C)).

Set in the above order, supply the molten metal into the mustard ladle, move the opening/closing plate 3, open the nozzle 2 of the ladle 1, and pass the molten metal 9 from the ladle 1 through the tundish 4 and the core 5 in sequence. It is fed into a sump 8 formed by a casting roll 6.6° and a side weir 7. That is, when pouring, the side weir 7 can be preheated until just before the molten metal 9 is supplied from the ladle 1, so the side weir 7 is in a high temperature state, and therefore the inner surface of the side weir 7 ( It is possible to prevent the formation of a solidified shell on the surface that comes into contact with the molten metal. Therefore, it is possible to prevent the plate breakage phenomenon caused by the solidified shell generated on the inner surface of the side weir 7, and it is possible to achieve continuous casting of metal thin plates.

The present invention is not limited to the illustrated and described embodiments; for example, it is possible to use a moving device such as an electric motor in addition to the cylinder, to make the supporting member of the frame and the core integral with the cart, or to simply We have described the case where the tundish is supported by inserting and placing it on the frame, and the case where the ladle is preheated and set in the casting place, and then molten metal is supplied to the casting place and pouring starts. It is optional to supply the molten metal to the ladle and then set it in the casting place, and it goes without saying that various other changes can be made without departing from the gist of the invention.

[Effects of the Invention] As described above, according to the twin-roll continuous casting machine and the pouring start method using the twin-roll continuous casting machine of the present invention, (1) the lower casting position of one dollar set at the casting position; ■ A pair of casting rolls, a core, a tundish, a side weir, etc. can be easily set without being affected by space limitations, and space can be used effectively. (b) Immediately before the start of pouring, it is possible to assemble the twin-roll continuous caster and make the various arrangements required to start pouring with the twin-roll continuous caster. Since the side weir is set at , the side weir can be used at a high temperature at the start of pouring, which prevents the formation of a solidified shell on the inner surface of the side weir (the side that comes into contact with the pouring metal). (to) can prevent plate breakage and make continuous slabs of thin metal plates, etc., and exhibits various excellent effects.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the twin roll continuous casting machine of the present invention;
Figures (A), CB, and (C) are schematic diagrams showing the sequence of a pouring start method using the twin roll continuous caster of the present invention, and FIG. 3 is a schematic diagram showing a conventional twin roll continuous caster. In the figure, 1 is a single dollar, 2 is a nozzle, 3 is an opening/closing plate, 4 is a tundish, 4a is a protrusion, 5 is a core, 6.6' is a casting roll, 7 is a side weir, 8 is a sump, 9 1 is a molten metal, 10 is a guide roll, 11 is a solidified shell, 12 is a slab, 13 is a pinch roll, 14 is a truck, 15 is a wheel, 17 is a cylinder, 19 is a frame body, 19a is a recessed part, 20 is a support member, A
indicates a twin-roll continuous casting machine, and G indicates a gap of 6.6° between the casting rolls.

Claims (1)

[Scope of Claims] 1) A pair of casting rolls arranged parallel to each other at a required interval on a horizontally movable trolley, and with facing surfaces rotating downward, and shafts of the pair of casting rolls. a side weir that can be disposed on both end sides in the direction; a core that can be installed on the truck so as to be located above the opposing gap between the pair of casting rolls;
A twin-roll type characterized by comprising a tundish connectable to the upper end of the core and installable on the trolley, and a ladle installable above the pair of casting rolls set at a casting position. Continuous casting machine. 2) The tundish and medium are poured from the ladle into a pool formed by side weirs located at both axial ends of a pair of casting rolls that are arranged parallel to each other at a required interval and whose facing surfaces rotate downward. The molten metal is supplied through the casting roller, the molten metal is cooled by the pair of casting rolls to form a solidified shell, and the solidified shell is pulled downward from a gap formed on the facing surfaces of the pair of casting rolls to perform casting. In a twin-roll continuous casting machine, the ladle is set at the casting position after at least preheating, and then the preheated medium is placed above the gap formed between the facing surfaces of a pair of casting rolls located at a location other than the casting position. After that, the pair of casting rolls, the core and the tundish are moved together and set at the casting position below the ladle, and then both axial ends of the pair of casting rolls are placed. A method for starting pouring using a twin-roll continuous caster, which is characterized by pouring by setting a preheated side weir on the side.