JPS58179546A - Continuous casting device of hoop - Google Patents

Abstract

PURPOSE:To provide a continuous casting device which can produce a steel hoop directly from molten metal by putting belts on guide rolls and cooling rolls which are placed so as to face each other at required intervals respectively and arrayed in a row and supplying the molten steel into the passage for the steel plate formed between the belts. CONSTITUTION:Molten steel 14 is supplied from a tundish 1 through a nozzle 2 into the spacing between both steel belts 9 and 9', and is stored therein. Cooling rolls 5, 5' are rotated at a required peripheral speed, and the belts 9, 9' are unrolled and rolled in synchronization with said peripheral speed. The steel 14 is cooled by coolers 11, 11', rolls 5, 5' and coroles 12, 12' through the belts 9, 9' so that the steel 14 is cooled to solidify along the belts 9, 9'. The solidified layers 15, 15' formed in such a way are fed to the down stream while the layers are grown according to the movement of the belts 9, 9' until the molten steel solidifies thoroughly down to the inside part. The belts 9, 9' are stripped at the point of the time when the solidification is completed or when the layers 15, 15' solidify to a sufficient thickness, and the casting is completed. As a result, the production efficiency is improved considerably, and the manpower and energy of the production line are lessened.

Description

[Detailed description of the invention] By making it possible to significantly improve production efficiency and save production lines,
The present invention relates to a continuous strip casting device that can promote J conversion and energy saving.

The most common method for producing steel sheets, and one that is still in use today, is to cast thick slabs using a continuous slab casting machine and roll them on a separate rolling line.
This is a method of manufacturing a plate by rolling it several times to make it thin, and then using a light finish rolling process, which involves arranging a large number of finish rolling mills in tandem. However, this method requires heating the slab and controlling the temperature to a constant temperature for rolling, which requires a large amount of rolling energy as well as heating energy.

In addition, since the slab casting speed in the casting line and the rolling speed in the rolling line are different, it is impossible to run both lines continuously, and in order to manufacture strips, two lines are required. We have no choice but to install equipment. Therefore, the equipment becomes large-scale and equipment for connecting both lines is also required.

The present invention makes it possible to immediately cast a strip from molten steel, while greatly increasing the casting speed and making it possible to connect the casting line and rolling line in a continuous manner, facilitating equipment simplification and energy savings. The purpose is to

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

FIG. 1 shows a first embodiment of the invention.

In the figure, 1 is a tandish, and a nozzle 2 is attached to the bottom.

Deflector roll 3 with a required spacing above and below the tip of the nozzle 2. and the deflector rolls 3, 3'
In order to form a steel plate passage by extending the interval downward,
Guide roll group 4゜a, cooling roll 5. 6. Guide roll group 6. d. Deflector rolls 7.7 are installed in series.

Unwinding reels 8 and d are arranged near the downstream deflector rolls 3 and 3', and the downstream deflector rolls 7 and 7'
Take-up reels 10 and 10 are arranged near one of the unwinding reels 8, and the steel belt 9 wound around one unwinding reel 8 is applied to the deflector roll 3, the guide roll group 4, the cooling roll 5, the guide roll group 6, and the deflector roll 7. It is wound in sequence and wound around one take-up reel lO. Also, the other unwinding reel 8',
A steel belt 9' is similarly wound around the take-up reel 10, and both steel belts 9. Side walls (not shown) are provided on both sides of the space sandwiched by Cj to form a liquid-tight steel plate passage. A cooling device 11.11.12.12 is disposed in each of the guide roll groups 4.4', 6.6, and 6. Cooling water can be circulated inside the cooling rolls 5.5.

Next, the operation will be explained.

As shown in the figure, molten steel 14 is poured from the tanditshu 1 into the nozzle 2.
Molten steel 14 is stored in both belts 9, 9' through the belts 9, 9', and the cooling rolls 5, 5' are driven to rotate at a required circumferential speed, and the steel belts 9, 9 are unwound and wound up to match the circumferential speed.

Molten steel 1 is cooled by cooling devices 11, 11° through steel belts 9, 9', cooling rolls 5, 5', and cooling devices 1z, 1i.
The molten steel 14 is cooled along the steel belts 9, 9'.
is cooled and solidified. Solidified layer 15.15 is steel belt 9
, 9' moves downstream while growing, and eventually solidifies completely to the center. When solidification is completed or solidified layer 15. When Ig reaches a sufficient thickness, the steel belts 9, 9' are peeled off to complete the casting.

Here, in order to prevent the steel belts 9, 9' and the molten metal 14 from coming into too close contact with each other due to sintering, a lubricant or an anti-seize agent is applied to the belt surface, and the belt is made of the same material as the molten steel. , different materials, cold-rolled plates, hot-rolled plates, etc. are selected as appropriate depending on the casting conditions. Further, the stripped steel belt may be scrapped or reused, or may be made into an endless belt for cyclic use.

In the second embodiment shown in FIG. 2, the cooling roll 5.5' is inclined with respect to the arrangement of the guide roll groups 4, 4' and the guide roll groups 6, 6'. The passage is curved so that the circumferential speed of the cooling rolls 5 and 5' is set to the actual speed.

If the second embodiment is adopted, the contact length between the cooling rolls 5, 5 and the molten steel (via the steel belt) becomes longer, the cooling effect is improved, and the casting speed can be increased. Furthermore, since the upper solidified layer 15 and the lower complex solidified layer 15' move at different speeds and are bent, shear stress and shear deformation occur at the boundary, which agitates the unsolidified metal at the boundary, causing non-metallic The segregation of fat I
At the same time, the quality of the steel sheet can be improved by making the internal fibers denser.

FIG. 3 is a modification of the second embodiment, in which a heat insulating material 13 is provided on the upper side of the steel plate passage to prevent the upper solidified layer 15 from growing too much.

As described above, according to the present invention, (+) The cooling zone can be made longer, so casting can be sped up. O) The main cause of surface cracks during casting is that the weak solidified layer immediately after cooling is formed in the mold. The belt protects the surface from friction and tensile stress when it is peeled off from the surface until it solidifies in 1 minute, so surface cracking can be prevented. Good quality and less scale generation, 13v)
The casting speed is increased, making it easier to match with the rolling line.”
It exhibits various excellent effects such as high T performance and good surface texture as described above, so it can be directly connected to the finish rolling process.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the first embodiment of the present invention, and FIG. 2 is an explanatory diagram of the second embodiment of the present invention.
FIG. 3 is an explanatory diagram of the third embodiment. 4.4', 6, 6' are guide roll groups, and 9, 9' are steel belts. Patent application Hitoshi Kawajima Harima Heavy Industries Co., Ltd. 10'

Claims (1)

[Claims] 1) Guide rolls and cooling rolls are arranged in rows facing each other with a required interval, and a belt is wrapped around each of the guide rolls and cooling rolls in both rows to form a steel plate passage between the belts, and both cooling rolls are connected to each other in a row. The molten steel is cooled through the belts by moving both belts according to the circumferential speed of fl.
1. A continuous belt casting device characterized by being configured so that the belt can be peeled off from solidified steel.