JPH0219742B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method and apparatus for changing the width of a slab in continuous casting of thin-walled slabs, and particularly relates to a method for changing the width of a slab in continuous casting of thin-walled slabs, and particularly relates to a method for changing the width of a slab in continuous casting of thin-walled slabs. This paper proposes a technology for changing the width of slabs without interrupting casting in continuous casting technology, which directly manufactures slabs without interrupting casting.

Conventionally, in order to manufacture thin metal sheets, a steel ingot was first created through an ingot-forming process, and then the ingot was bloomed and rolled to obtain a thickness.
After forming a slab of 100 to 300 mm, it was further rolled through a heating furnace, called rough rolling, into a thin steel slab of about 30 mm, and then the steel slab was hot-striped into a thin steel plate of 10 mm or less.

On the other hand, in the past, the continuous casting method was used to directly manufacture slabs using a technique called a sliding die, as shown in FIG. 1. This technology transfers molten metal to nozzle 1.
01 into a water-cooled mold 102 to generate a solidified shell 103 along the casting wall, the solidified shell 103 is continuously pulled out as a thick slab through guide rolls 104, etc., and then This method involves rough rolling to make the material thinner, but it has the following problems. In other words, since the solidified shell slab is pulled out by sliding successively at the contact surface with the mold inner wall surface, the resistance increases as the speed increases, and there is a limit to speeding up (2
m/min) was hot.

Pinch rolls are required to pull out the solidified slab, and breakouts are likely to occur when the control of the drawing speed is disrupted.

Sliding surfaces are prone to scratches, reducing yield.

The following points can be mentioned.

On the other hand, in order to overcome the above-mentioned drawbacks, there has been proposed a rotary belt type continuous machine corresponding to the sliding type in Japanese Patent Laid-Open No. 55-8311. However, for this rotating belt type,
There was an inconvenience that the width of the slab could not be changed during casting without interrupting the casting process.

The present invention is aimed at overcoming the drawbacks of the prior art precisely as mentioned above, and aims at providing a slab width that can be advantageously used to obtain a slab of the desired width during pouring without interrupting the operation. Suggest change techniques. The configuration will be explained in detail below.

FIGS. 2 and 3 both show a rotary belt type thin-wall continuous casting machine according to the present invention, in which 1 is a tundish, 2 is an injection nozzle, 3, 3' and 4, 4' is an endless circulating body for regulating the thickness direction of the slab, and includes a plurality of idle rolls and drive roll groups 5..., 6.
They are opposed to each other over a predetermined distance in the slab drawing direction via... and circulate while maintaining a constant interval. On the other hand, a pair of stationary side plates 7, 7' are provided between the two circulating bodies 3, 3', 4, 4' which are disposed opposite each other and are sandwiched between them at positions near the side edges. . The fixed side plates 7, 7' are
While being sandwiched between the two circulation bodies 3, 3', 4, 4', it is possible to slide it in the pouring direction, that is, in the direction of slab withdrawal, while maintaining a liquid-tight state. At the same time, they also slide toward or away from each other while maintaining a liquid-tight state in a direction perpendicular to the slab drawing direction, that is, in the slab width (L) direction. In short, the stationary side plates 7, 7' can be moved both in the pouring direction and in the slab width direction.

FIG. 4 shows a preferred example of the mechanism used to move the stationary side plates 7, 7'. This mechanism consists of female and male guide supports 11, 11', 1 attached via clamps 10, 10' to a chain 9 stretched between a pair of chain sprockets 9a, 9b.
The fixed side plates 7, 7', 8,
The guide supports 11, 11', 12, 1 move together when the chain 9 is circulated by the drive of the motor 13.
2' moves the stationary side plates 7, 8 in the pouring direction.

In addition, the guide supports 11, 11', 1
Hydraulic cylinders 14 and 15 are built into the hydraulic cylinders 14 and 15, and the female guide supports 11 and 11' are expanded and contracted by their operation and are fixed at their free ends. The structure is such that the fixed side plates 7 and 8 are moved in the width direction of the slab.

In addition, in the device of the present invention, the fixed side plates 7, 8
consists of two upper and lower blocks 7 and 8 in the pouring direction (slab withdrawal direction). Under normal conditions, the upper block 7 is located from the level just above the molten metal surface to the level just below the meniscus, and is The casting width L is maintained (at this time, the lower block 8 is either retreating or waiting at a position outside the casting space). In this way, by configuring the two blocks 7 and 8, and by moving the fixed side plates 7 and 8 using the moving mechanism, it is possible to sequentially place the upper blocks from above. This makes it possible to change the width of the slab without interrupting casting. For example, in FIG. 4, the fixed side plate 8 located on the lower side is
Remove the clamp 10' (you may move it in circulation without removing the clamp), place it on the upper fixed side plate 7, and move the fixed side plate 8 that has been shifted to the upper position to the hot water level. ,3',
If you move it together with 4 and 4', it will be wider (L')
It becomes possible to cast slabs of

Next, a method of changing the width of a slab having a width L to a slab having a narrow width L will be explained with reference to the process diagram of FIG. 5.

When changing the slab width from L to L as shown in Fig. 5-a, first, as shown in Fig. 5-b, the fixed side plate 7,
7' (width: L), another pair of fixed side plates 8,
8' (width: l) to prepare it. next,
As shown in FIG. 5-c, by moving the chain 9 of the moving mechanism shown in FIG. 4 in synchronization with the movement of the circulating body 3, both fixed side plates 7 and 8 are moved in the direction of pouring the metal. and bring it until the fixed side plates 8 and 8' located above are at the level of the molten metal, and the solidified shell 16 with a width of L and the solidified shell 17 with a width of l are placed together in the same casting space. lead to a state of continuation. Finally, as shown in Figure 5-d, the width:
A solidified shell slab 17 with a narrow width of
4, it is moved back and further the clamp 1
Remove 0 to set it to standby. Each of these steps for narrowing the width can be applied as is when changing the width to a wider width in exactly the same order of steps.

The reason why continuous width changes are possible without interrupting casting in the present invention is because the short side of the slab has a thickness of at most 30 to 50 mm and cools quickly. If the molten metal has time to move in the pouring direction within the casting space, it is sufficient to grow a solid solidified shell to form a narrow-to-wide slab.

As explained above, according to the present invention, since the width of the slab is automatically changed without interrupting casting, there are significant operational and cost effects, and in particular, the amount of cut-off due to changing the width is reduced. Yield improves because it decreases.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of conventional continuous slab casting technology, FIGS. 2 and 3 are front views schematically showing the thin wall continuous casting apparatus of the present invention, and FIG. 4 is a fixed side plate. A front view showing an example of a moving mechanism,
FIG. 5 is a process diagram of the method for changing the slab width of the present invention. 1...Tendishu, 2...Injection nozzle, 3,
3', 4, 4'... Circulating body, 5, 6... Roll,
7, 7', 8, 8'... fixed side plate, 9... chain,
9a, 9b... Chain sprocket, 10, 1
0'... Clamp, 11, 11', 12, 12'...
...Guide supporter, 13...Motor, 14,1
5... Cylinder, 16, 17... Solidified shell.

Claims (1)

[Scope of Claims] 1. A pair of circulating bodies for regulating the thickness direction of the cast slab arranged in opposition to circulate while maintaining a predetermined interval, and a pair of fixed side plates for regulating the widthwise direction of the cast slab disposed between the circulating bodies. During continuous casting of thin slabs by injecting molten steel from one side and pulling out solidified slabs from the other into a casting space surrounded by The upper block placed on the upstream side of the mold is adjusted to the changed casting width, and the fixed side plate with the upper block placed on the lower block is moved until the upper block comes to the level equivalent to the molten metal level as the circulating body moves. A method for changing the width of a slab in continuous casting of a thin-walled slab, characterized in that the width of the slab is moved together with a circulating body during the continuous casting of a thin-walled slab. 2. A casting space surrounded by a pair of circulating bodies for regulating the slab thickness direction, which are disposed facing each other and circulate at a predetermined interval, and a pair of fixed side plates for regulating the slab width direction, arranged between the circulating bodies. In a slab width changing device used to continuously cast thin slabs by injecting molten steel from one side and pulling out solidified slabs from the other, the device consists of two blocks in which each fixed side plate is divided in the pouring direction. The stationary side plate of each block was supported so that it could move in the width direction of the slab via a cylinder, and was also supported so that it could move in the pouring direction by being connected to a circulating machine through the cylinder. A slab width changing device for continuous casting of thin-walled slabs.