JPH03291140A - Belt type continuous caster - Google Patents

Abstract

PURPOSE:To obtain uniform pouring of molten metal in the width direction and to improve the quality of strip by constituting a molten metal discharging hole in a belt type continuous caster of a trough bottom plate and two trough side plates and making the trough side plates swingable on the trough bottom plate. CONSTITUTION:In the belt type continuous caster for continuously casting the metal strip by cooling and solidifying the molten metal on the belt inclinedly running, a pouring trough composed of the trough bottom plate 16 and two trough side plates 17, 18 is arranged at the molten metal discharging hole 15 in a molten metal pouring device 10. The trough side plates 17, 18 are made swingable on the trough bottom plate 16 with the end part at the molten metal discharging hole side being the supporting point and the molten metal discharging opening degree formed with the trough side plates 17, 18 is made changeable according to the cast strip width size. By this method, the uniform pouring of molten metal in the width direction can be achieved with one pouring trough, and local remelting of the solidified shell in the pouring basin part can be prevented and the quality of strip can be improved.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is a method of discharging molten metal (molten metal) on a belt running at an angle.
Concerning belt-type continuous casting machines (hereinafter referred to as belt-type continuous casting machines) that continuously cast metal thin plates (hereinafter referred to as thin plates) by cooling and solidifying metal, in particular pouring of molten metal into the belt. Regarding equipment.

[Conventional technology]

In recent years, several pieces to several pieces close to the final shape have been created from molten metal such as molten steel.
A continuous casting method that directly and continuously casts a thin plate having a thickness of about 0+u+ is attracting attention. If you use this method,
Since there is no need to perform treatments such as rolling in multiple stages as in the conventional method, the process and equipment can be simplified. In addition, this method is effective in terms of energy saving because the number of times the material is heat treated between each process is reduced.

One of the continuous casting machines that achieves this continuous casting method is a belt type chain machine disclosed in, for example, Japanese Patent Laid-Open No. 62-97750.

In this belt-type continuous casting machine, a metal belt, for example, is passed around a pair of bobbles, and runs on an endless track. Then, the belt is run with an inclination so that the casting direction is upward, and a pool section defined by a fixed weir and a pair of side weirs is provided on this belt, and a pouring device is connected to this pool section. By pouring molten metal and cooling and solidifying the molten metal by a cooling device placed below the belt, thin metal sheets are continuously cast from one pulley.

[Problem to be solved by the invention]

By the way, in general, in the above-mentioned belt type continuous casting machine, the pouring gutter installed at the outlet of the pouring device and guiding the molten metal from the pouring device to the sump l\ is uniformly spread along the width direction of the thin plate to be cast. It must be formed so that molten metal can be poured into it. However, since this pouring gutter is usually provided as a pair of thin plates with one width dimension, if you try to cast a thin plate with a medium size smaller than the previous medium size using this continuous casting machine, The conventional injection gutter had to be replaced with an injection gutter suitable for the required thickness of the thin plate, which caused problems in that it took time to replace and increased costs. Conversely, when casting a thin plate with a large width, if the conventional pouring gutter were used to pour the metal, the flow of molten metal concentrated in a specific part of the pool would re-melt the solidified shell that had formed in this part. This results in a thin plate having a non-uniform thickness in the middle direction being cast, which tends to impair casting quality.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a belt-type continuous casting machine that can always uniformly pour molten metal into a sump in the middle direction in response to changes in the thin plate.

[Means to solve the problem]

In order to solve the above object, according to the present invention, molten metal is poured onto the belt running at an angle from a pouring device provided above the belt, and the poured molten metal is transferred by the belt. In a belt-type continuous casting machine that continuously casts thin metal sheets by cooling and solidifying, a gutter bottom plate is installed at the tap outlet of the pouring device, and a gutter bottom plate is installed on the gutter bottom plate, sandwiching the tap tap and extending in the pouring direction. A pouring gutter consisting of two gutter side plates is provided, and the gutter side plates are made pivotable on the gutter bottom plate using the end on the outlet side as a fulcrum, and the width of the thin plate to be cast is adjusted according to the width of the thin plate described above. A belt-type continuous casting machine is provided, which is characterized in that the opening angle of the hot water controlled by two gutter side plates is made variable.

[For production]

By making the two gutter side plates that determine the outlet of the injection gutter movable on the gutter bottom plate, when casting a thin plate with a large width, the gutter side plates can be widened radially to increase the outlet opening angle. Make sure that the hot water is poured evenly in the middle of the hot water pool. In addition, when casting a thin plate with a small width, the gutter side plates are operated to reduce the opening angle of the tapped metal accordingly to uniformly pour the metal.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a schematic configuration of a belt-type continuous casting machine 1 as an embodiment of the present invention, in which a metal endless belt (hereinafter referred to as belt) 2 has a pair of pulleys 3 and 4
The hook has been passed.

One pulley 4 is held at a higher position than pulley 3, and these pulleys 3 and 4 are driven by a drive device such as a motor.
I (not shown) rotates in the direction indicated by the arrow in the figure. Therefore, the upper half of the belt 2 rises while tilting toward the pulley 4 located at a high position, as shown by arrow a. In this figure, arrow a corresponds to the casting direction of the continuous casting machine 1.

For the belt 2 moving in this way, on both sides,
A plurality of heat-resistant blocks 5 connected by chains or the like are arranged, and these heat-resistant blocks 5 move in synchronization with the running of the belt 2, and move on both sides of the pool 6 at the upper part of the belt where the belt 2 runs linearly. A partitioning side weir 7 is configured.

On the other hand, at the rearmost part of the water reservoir 6, a fixed weir 8 that slides in contact with the running belt 2 is fixed by a support mechanism (not shown). And this fixed weir 8, side weir 7 and belt 2
A pouring device 10 equipped with an injection gutter 9, which is a feature of the present invention, is disposed above the pool 6 defined by will be poured.

A cooling device 13 is provided on the back side of the belt 2 portion that forms this pool 6, and removes heat from the poured molten metal 11 to generate solidified gel 12 on the surface of the belt 2. The solidified shell 12 is conveyed while growing as the belt 2 moves, and finally separates from the belt 2 at the pulley 4, becomes a thin plate 14, and is carried out from the continuous casting machine 1.

FIG. 2 is an external view of the injection gutter 9 and pouring device 10 described above.

As is clear from this figure, the pouring device 10 is formed as a casing made of refractory material, and a ladle (not shown) is installed inside the casing.
It is designed to accommodate molten metal 11 from. Further, this pouring device 10 is formed with a tap hole 15 that serves as an outlet for the molten metal 11, so that the molten metal 11 flows into a pouring gutter 9, which will be described below.

The injection gutter 9 connected to the outlet 15 is as shown in the figure.
The gutter bottom plate 16 and the outlet 1 on the gutter bottom plate upper 16
5 from both sides, and two gutter side plates 17 and 18 are provided which extend in the hot water outlet direction indicated by arrow B in the figure. Naturally, the gutter bottom plate 16 is made of a heat-resistant material so as not to be damaged by melting due to the molten metal 11 flowing out from the spout 15.

According to this embodiment, the two gutter side plates 17 and 18 standing upright on the gutter bottom plate 16 are gutter side plate portions 17a and 18a made of a heat-resistant material like the gutter bottom plate 16, and these gutter side plate portions 17a, Metal frame 17b that supports 18a from the outside
and 18b, and a metal frame 17b.

Ends 17c and 18c of each outlet 18b are hinged to one side plate 10a of the pouring device 10, so that the gutter side plates 17 and 18 are mounted on the gutter bottom plate 16 using these ends 17c and 18c as fulcrums, respectively. It is possible to pivot.

Further, on the outer side of this gutter side plate 17, 18, there is a metal frame 17b.

Actuators (for example, hydraulic cylinders) 19 and 20 are installed which are connected to each of the actuators 18b and rotate the actuators around the fulcrum.

The operation of the continuous casting film of this embodiment constructed as described above will be explained below with reference to FIG.

FIG. 3 is a view of the continuous casting machine 1 seen from above, and shows a thin plate 14' having a medium dimension W' larger than the illustrated thin plate width W.
When casting, the distance between the side weirs 7 is increased accordingly. In this case, in the injection gutter 9, the gutter side plates 17 and 18 are rotated in a direction away from each other by the actuators 19 and 20, and the gutter side plates 17
, 18, that is, the pouring opening angle α is increased (α').As a result, the molten metal 11 is poured uniformly in the width direction of the newly formed pool. Therefore, the problem of remelting of the solidified shell due to localized pouring is eliminated.

Conversely, when casting a thin plate 14'' having a width w'' smaller than the illustrated thin plate width W, the distance between the side weirs 7 is reduced accordingly. At this time, on the side of the injection gutter 9, the gutter side plates 17 and 18 are rotated in a direction toward each other by the actuators 19 and 20, and the angle formed by the gutter side plates 17 and 18 up to that point is changed. The molten metal opening angle α is reduced (α′〉), and as a result, even if there is a small pool in the newly formed medium dimension, the molten metal 11 is uniformly spread in the direction of the newly formed medium dimension. will be poured.

As described above, according to this embodiment, by changing the pouring opening angle of the gutter side plates 17 and 18 of the pouring gutter 9 according to the required width of the thin plate 14, it is possible to form a thin plate tJ of any width.
A uniform amount of molten metal 11 can also be supplied to the J structure along the middle direction of the tundish portion 6, thereby suppressing the variation in solidified shell formation in this direction.

Although the embodiment of the present invention has been described above by taking an example of a continuous casting machine using a single belt, the present invention is not limited to this embodiment. It is also applicable to a twin-belt continuous casting machine in which molten metal is poured between two endless belts, and is particularly effective for a twin-belt Buun M casting machine that has an inclined belt.

In another embodiment of the injection gutter, in order to achieve a more uniform flow of the molten metal in the middle direction, the gutter bottom plate 16' itself is curved in a convex shape, as shown in FIG. The tendency of the gutter bottom plate to concentrate in the center may be weakened.

A view of the machine from above; FIG. 4 is a front view of the injection gutter showing another embodiment of the injection gutter.

1... Belt type continuous casting machine, 2... Belt, 9... Injection gutter, 10...
pouring device, 11... molten metal, 14... thin plate,
16... Gutter bottom plate, 17.18... Gutter side plate.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to achieve uniform pouring in the middle direction with one pouring gutter even in response to a request for changing the width of the thin plate, and it is possible to achieve uniform pouring in the middle direction of the solidified shell in the sump. It is possible to prevent re-melting and provide high quality thin sheets.

[Brief explanation of drawings]

Claims (1)

[Claims] 1. Molten metal is poured onto the belt running at an angle from a pouring device installed above the belt, and the poured molten metal is cooled and solidified by the belt. In a belt-type continuous casting machine that continuously casts thin metal sheets, the tap hole of the pouring device is provided with a gutter bottom plate and two grooves installed on the gutter bottom plate sandwiching the tap hole and extending in the pouring direction. A gutter side plate is provided, and the gutter side plate is made pivotable on the gutter bottom plate using the end of the gutter side plate as a fulcrum, and the two gutter side plates are arranged according to the width of the thin plate to be cast. A belt-type continuous casting machine characterized by a variable tap opening angle.