JPH07110399B2 - Continuous casting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting apparatus having an improved fin roll shape for backing up a belt in a casting area.

[0002]

2. Description of the Related Art An example of a conventional twin belt type strip continuous casting apparatus is shown in FIGS. 8 to 10, and the prior art will be described with reference to these drawings.

FIG. 8 is a schematic side view of a conventional twin-belt type continuous casting apparatus, FIG. 9 is an enlarged front view of a sectional view taken along the line FF of FIG. 9 G-G
It is the top view which expanded the arrow cross section.

As shown in these figures, a top pulley 1 and a bottom pulley 2 each supported by a bearing block 4 and a side pulley 3 supported by a movable bearing box 5.
The pair of belts 6 are rotated by being wound around. With this rotation, the portions of the belt 6 facing each other are fin rolls 21 supported by the frame 14 via the rotation shaft 13.
And, it is backed up and lowered by the cooling pad 16. A moving wall of the moving mold is formed by the descending portion of the belt 6 and the side dam 7 which is held by both ends of the pair of belts 6 and rotates in synchronization with the belt 6.

The pair of belts 6 are formed by a water film of the cooling water W jetted from the jet nozzle 8 located at the tip of the water supply pipe 9 and the cooling water circulating in the cooling pad 16.
To be cooled.

The cooling water W flows down from above the fin roll 21 to the cooling pad 16 along the belt 6 while forming a required water flow thickness w _o, and the belt 6 in the meantime.
To cool.

When casting is performed with a mold having such a structure, molten steel L is continuously supplied from above, and the solidified strip-shaped slab S is guided by a guide roller apron 17,
An unillustrated pinch roller is used to pull out.

[0008]

In the above-mentioned conventional apparatus, as shown in FIG. 10, the thickness t _o of the fin roll 21 is _large.
Is 2 mm to 3 mm, and the flow of the cooling water is blocked by the fin roll 21 and is divided. Therefore, the water film thickness w _{o of} the cooling water W for cooling the belt 6 below the fin roll 21 becomes thin, or the flow velocity decreases, so that the belt 6 has an insufficient cooling portion.

For this reason, the belt 6 is partially overheated, and the molten steel L pouring flow is unbalanced, and the level of the molten metal between the belts 6 fluctuates (for example, descends). There is a risk of deformation and damage of the belt 6 due to melting.

[0010]

SUMMARY OF THE INVENTION A continuous casting apparatus according to the present invention comprises an outer circumference of a ring-shaped belt wound around a top pulley and a bottom pulley located below the top pulley and having cooling water flowing on the inner circumferential surface side. A pair of the belts are provided so that the surfaces face each other, and a pair of side dams for closing the ends of the pair of belts are provided, and the pair of belts and the pair of side dams are connected to the top pulley and the In a continuous casting apparatus that descends between bottom pulleys and continuously casts strips, the tips of fin rolls that are installed on a rotating shaft extending along the width direction of the belt and that support the inner peripheral surface side of the belt. The part has a thickness of 1 mm or less.

[0011]

Operation: Both the pair of belts rotate, the belt is lowered between the top pulley and the bottom pulley, and the side weir is lowered as the belt is lowered. The inner peripheral surface side of the descending belt is supported by the tip end side of the fin roll installed on the rotating shaft, and the cooling water flows on the inner peripheral surface side to cool the belt. Then, molten steel is poured into the space formed by the belt and the side weir to solidify, and the strip is continuously drawn out from below to perform casting.

At this time, although the water film of the cooling water flowing down on the inner surface of the belt is divided by the fin roll, the thickness of the tip end of the fin roll contacting the belt is as thin as 1 mm or less. Repaired immediately under the roll. Further, the resistance of the fin roll to the flow of the cooling water is reduced, the flow velocity of the cooling water below the fin roll is suppressed from being reduced, and the belt is cooled substantially uniformly.

[0013]

EXAMPLE A first example of the continuous casting apparatus of the present invention is shown in FIGS. 1 to 6 and 8, and this example will be described with reference to these figures. The same members as those described in the related art are designated by the same reference numerals, and a duplicate description will be omitted.

As shown in FIG. 8 and FIG. 1 which shows an enlarged view of the essential parts of this embodiment, a ring-shaped belt 6 is wound around the top pulley 1, the bottom pulley 2 and the side pulley 3.
The belts 6 are located adjacent to each other such that the portions supported by the top pulley 1 and the bottom pulley 2 face each other. Then, a pair of side dams 7 in which a large number of rectangular blocks 7a are connected in a ring shape are adapted to rotate in synchronization with the belt 6, and the moving blocks 7
a is held between the two ends of the pair of belts 6, respectively.

That is, the block 7a of the pair of belts 6 and the pair of side dams 7 forms a rectangular moving wall, and the belt 6 and the side dams 7 rotate at this portion so as to descend. To do.

Further, as shown in FIGS. 2 to 5, a jet nozzle 8 is attached to the tip of a water supply pipe 9 loosely fitted in a large number of grooves 1a on the outer peripheral surface of the top pulley 1.
The rotary shaft 13 is located below the jet nozzle 8,
The disk-shaped fin rolls 11 are installed at predetermined intervals on the rotary shaft 13. The fin roll 11 has a tapered shape such that the outer peripheral end portion has a thickness t as thin as about 1 mm.

That is, as shown in FIG. 5, the base end side of the fin roll 11 has a thickness of about 2 mm as in the conventional case, but the thickness gradually decreases from the portion 1 mm or more away from the tip. The thickness t of the tip is about 1 mm.

On the other hand, a plurality of rotating shafts 13 supported in parallel
A cooling pad 16 is positioned below the belt 6 and is in contact with the pair of belts 6 from the inner peripheral surface side, which is the back surface side.
Cooling and backup.

Next, the operation of the continuous casting apparatus of this embodiment will be described.

When the pair of belts 6 and the side weir 7 are rotated, the fin rolls 11 abutting on the belts 6 are moved to the belts 6.
It rotates with the descending of. Further, the cooling water W is jetted from the jet nozzle 8 toward the pair of belts 6, respectively. Therefore, the cooling water W flows along the inner peripheral surface of the belt 6 to form the required water film thickness w _o , and hits the fin roll 11 to pass therethrough. As a result, the cooling water cools the belt 6 while flowing down to the cooling pad 16.

The portion of the belt 6 that has moved further downward is cooled by the cooling pad 16.

The molten steel L is supplied to the mold formed by the belt 6 cooled in this way, solidified, and further drawn out as a strip-shaped slab S to be continuously cast.

At this time, the water film of the cooling water is the fin roll 1
Although the fin roll 11 is divided by 1, the thickness t of the fin roll 11 is thin, and the fin roll 11 is immediately restored on the downstream side due to the viscosity of water. Further, since the thickness t of the tip end portion of the fin roll 11 is as thin as about 1 mm, the resistance exerted on the flow of the cooling water W becomes small, and the decrease in the flow velocity of the cooling water W below the fin roll 11 is suppressed. Therefore, the change in the water flow is reduced, and the belt 6 can be cooled substantially uniformly over the entire width direction.

Specifically, as shown in FIG. 6, the flow velocity of the cooling water at the position A shown in FIGS. 3 and 4 just below the fin roll 11 located at the uppermost portion, the fin roll according to the prior art is shown. Compared to. Therefore, it has become possible to obtain a required flow velocity that cannot be obtained by the fin roll of the related art having no tapered portion at the tip.

As a result, the belt 6 can be cooled efficiently and sufficiently, and the belt 6 is prevented from being overheated.

Next, a second embodiment of the present invention will be described with reference to FIGS.
This embodiment will be described with reference to FIGS. 7 and 8 and based on these drawings. The same members as those described in the related art and the first embodiment are designated by the same reference numerals, and a duplicate description will be omitted.

As shown in FIG. 7, a disk 12 is attached to the rotary shaft 13 at a predetermined interval, and a disk-shaped fin roll 11a is fitted around the disk 12. The fin roll 11a, which is separate from the disk 12, has a thickness t of 1
It is about mm and the depth h of the fin roll 11a
Is a value slightly larger than the water film thickness w _{o of the} cooling water flowing out from the jet nozzle 8 so that the water flow of the cooling water does not hit the disk 12. Also, the fin roll 11a
The inner peripheral side of is firmly joined to the disk 12 by means such as welding. That is, it is possible to use a high-strength material only for the fin roll 11.

With this structure, not only the effect of the first embodiment can be obtained, but also the thickness of the fin roll can be maintained while maintaining the strength which cannot be achieved by the fin roll integrally formed. It has become possible to satisfy the demand for thinner products.

[0029]

According to the continuous casting apparatus of the present invention, the thickness of the tip end portion of the fin roll supporting the descending belt from the back side is reduced to 1 mm or less, and as a result, the water film of the cooling water flowing down is the fin roll. Although it is divided, it is restored immediately below the fin roll due to the viscosity of water, and the thickness of the water film does not become extremely thin partially. In addition, the flow velocity of the cooling water below the fin rolls can be maintained at a required speed or higher.

For this reason, there is no risk of deformation of the belt due to partial overheating or melting of the belt.

[Brief description of drawings]

FIG. 1 is a side view of a main part of a continuous casting apparatus according to first and second embodiments of the present invention.

FIG. 2 is a front view in which a part of the sectional view taken along the line BB of FIG. 1 is cut away.

FIG. 3 is a schematic view showing a fin roll portion of FIG. 1 according to the first embodiment of the present invention.

4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is an enlarged view of portion D in FIG.

FIG. 6 is a diagram showing a relationship between a water amount density and a cooling water flow velocity.

FIG. 7 is an enlarged plan view of a cross section taken along line EE of FIG. 2 according to the second embodiment of the present invention.

FIG. 8 is a schematic side view of a continuous casting device according to first and second embodiments of the present invention and a conventional technique.

9 is an enlarged front view of a conventional technique in which a part of the sectional view taken along the line FF of FIG. 8 is cut away.

10 is an enlarged plan view of a cross section taken along line GG of FIG. 9. FIG.

[Explanation of symbols]

1 Top Pulley 2 Bottom Pulley 3 Side Pulley 6 Belt 7 Side Weir 8 Jet Nozzle 11, 11a, 21 Fin Roll 12 Disc L Molten Steel S Slab W Cooling Water w _o Water Film Thickness

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Noriyuki Kanai No. 1 Nishinosu, Oita-shi, Oita Prefecture, Nippon Steel Co., Ltd. Oita Works, Nippon Steel Co., Ltd. (72) Hiroyuki Yoshida No. 1 Nishinozu, Oita-shi, Oita Prefecture New Japan Oita Steel Works, Ltd. (56) References JP 62-6743 (JP, A) JP 6-36968 (JP, B2) JP 4-9617 (JP, B2)

Claims (1)

[Claims] 1. A pair of belts are wound around a top pulley and a bottom pulley located below the top pulley, and the outer peripheral surfaces of ring-shaped belts through which cooling water flows on the inner peripheral surface side face each other. And a pair of side dams for closing both ends of the pair of belts,
A pair of belts and a pair of side dams are descended between the top pulley and the bottom pulley, and in a continuous casting apparatus for continuously casting strips, a plurality of rotary shafts extending along the width direction of the belts are installed. The continuous casting apparatus is characterized in that the tip portion of the fin roll supporting the inner peripheral surface side of the belt has a thickness of 1 mm or less.