JPH1029046A - Twin roll continuous casting equipment - Google Patents

Abstract

(57) [Problem] To prevent a reduction in the thickness of a complete solid-phase shell of a strip due to reheating of an unsolidified portion. SOLUTION: A pair of cooling rolls 1a and 1b for continuously casting the strip 8, and a cooling gas is injected from immediately below the cooling rolls 1a and 1b toward the strip 8 located near the roll nip of the cooling rolls 1a and 1b. Nozzle 24
a, 24b and cooling panels 25a, 25b for radiant cooling the strip 8 immediately below the nozzles 24a, 24b
And a plurality of pairs of middle and low crown-shaped cooling pinch rolls 2 for sandwiching the strip 8 below the cooling panels 25a and 25b.
6a, 26b, 27a, 27b, 28a, 28b, which cools the strip 8 located near the roll nip of the cooling rolls 1a, 1b, and suppresses breakage of the strip 8 and end cracks of the strip 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin-roll continuous casting facility.

[0002]

2. Description of the Related Art Various twin-roll continuous casting facilities have been proposed as a means for continuously casting metal sheets from molten metal.

FIG. 3 shows a twin-roll type continuous casting apparatus (a twin-roll type continuous casting apparatus) disclosed in Japanese Patent Application Laid-Open No. 3-33053.

[0004] Reference numerals 1a and 1b denote a pair of cooling rolls (water-cooling rolls). The cooling rolls 1a and 1b are arranged horizontally and in parallel with each other.

[0005] Further, side dams (not shown) are provided on one end face and the other end face of the cooling rolls 1a and 1b, respectively.

Reference numeral 2 denotes an upstream chamber (body container),
The upstream chamber 2 has the cooling rolls 1a and 1b therein.

At a predetermined position in the upstream chamber 2, an inert gas supply port 3 for supplying an inert gas as an oxidizing gas to the inside of the upstream chamber 2 and a vacuum pump (not shown) are provided. A connected suction port 4 is provided.

Reference numeral 5 denotes a tundish. The tundish 5 is provided in the upstream chamber 2 so that a molten metal pool (molten metal pool) 6 can be formed in a space surrounded by the cooling rolls 1a and 1b and the side weir. Located inside.

The tundish 5 has an upstream chamber 2
The molten metal is supplied from a ladle 7 arranged above the molten metal, and the molten metal flows down from the tundish 5 so that the molten metal pool 6 is placed in a space surrounded by the cooling rolls 1a and 1b and the side weir. Is formed, the cooling roll 1a located on the right side in FIG.
Is rotated clockwise and the cooling roll 1b located on the left side in FIG. 3 is simultaneously rotated counterclockwise, so that the metal solidified between the cooling rolls 1a and 1b causes the cooling rolls 1a and 1b to rotate.
It is formed into a strip 8 (metallic strip) having a thickness corresponding to the roll gap of 1b, and is continuously fed downward to the cooling rolls 1a and 1b.

An opening is provided at the bottom of the upstream chamber 2 for sending the strip 8 to the outside, and the opening can be closed by an opening / closing door 9 if necessary. I have.

Reference numerals 10a and 10b denote a pair of nozzle groups (upper gas spray zone), and one of the nozzle groups 10a is not substantially horizontal as a cooling gas toward one side surface of the strip 8 sent out from the cooling rolls 1a and 1b. The other nozzle group 10b is arranged as a cooling gas substantially horizontally toward the other side of the strip 8 sent out from the cooling rolls 1a and 1b so as to be able to inject the active gas. It is arranged inside the upstream chamber 2 so that an inert gas can be injected.

Reference numerals 11a and 11b denote a pair of pinch rolls (guide rolls).
Is disposed on one side below the inside of the upstream chamber 2 so as to be able to sandwich the strip 8 delivered from the cooling rolls 1a and 1b from above and below.

Reference numeral 12 denotes a downstream chamber (a slab transfer container). The downstream chamber 12 is connected to a lower portion of the upstream chamber 2 and has pinch rolls 11a and 11b.
The interior is decorated.

At a predetermined location in the downstream chamber 12, an inert gas supply port 13 for supplying an inert gas as a non-oxidizing gas into the downstream chamber 12 is connected to a vacuum pump (not shown). Suction port 14 is provided.

Also, on one side of the downstream chamber 12,
An opening for delivering the strip 8 to the outside is provided.

Reference numerals 15a and 15b denote a pair of nozzle groups (lower gas spray zone). One nozzle group 15a supplies an inert gas as a cooling gas to one side surface of the strip 8 delivered from the upstream chamber 2. The other nozzle group 15b is disposed inside the downstream chamber 12 so that the inert gas can be injected, and the other nozzle group 15b injects an inert gas as a cooling gas toward the other side of the strip 8 delivered from the upstream chamber 2. As such, it is located inside the downstream chamber 12.

In the twin roll type continuous casting apparatus shown in FIG. 3, prior to the casting of the strip 8, the strip 8 is connected to the suction port 4 of the upstream chamber 2 with the opening of the upstream chamber 2 closed with the opening / closing door 9. Vacuum pump (not shown)
And a vacuum pump (not shown) connected to the suction port 14 of the downstream chamber 12 so that the inside of the upstream chamber 2 exhibits a higher degree of vacuum than the inside of the downstream chamber 12. The pressure inside the two chambers 2 and 12 is reduced, and the inert gas supply port 3 in the upstream chamber 2 is
By filling the interior of both chambers 2 and 12 with argon gas from the inert gas supply port 13 of the downstream chamber 12, the interior of both chambers 2 and 12 is made into an oxidizing gas atmosphere (inert gas atmosphere). The strip 8 is prevented from being oxidized.

When the metal solidified between the cooling rolls 1a and 1b is formed into a strip 8 having a thickness corresponding to the roll gap between the cooling rolls 1a and 1b, the opening and closing door 9 is moved to move the metal to the upstream side. The closure of the opening at the bottom of the chamber 2 is released so that the strip 8 is continuously delivered to the outside of the apparatus through the upstream chamber 2 and the downstream chamber 12, and inside the upstream chamber 2,
Helium gas is injected as a cooling gas from the nozzle groups 10a and 10b to both sides of the strip 8, and helium gas is injected as a cooling gas from the nozzle groups 15a and 15b to both sides of the strip 8 inside the downstream chamber 12. Then, the strip 8 is cooled.

FIGS. 4 and 5 show a twin-roll type continuous casting apparatus (a twin-roll type continuous thin-plate continuous casting apparatus) disclosed in Japanese Patent Application Laid-Open No. 5-277654. The attached portions represent the same thing.

16a and 16b are a pair of side weirs,
One side weir 16a is a cooling roll (casting roll) 1
a, 1b are arranged so as to be in surface contact with one end face, and
The other side weir 16b is arranged so as to be in surface contact with the other end surfaces of the cooling rolls 1a and 1b.
The molten metal pool 6 is formed in a space surrounded by the a and 1b and the side weirs 16a and 16b.

Reference numerals 17a and 17b denote a pair of dog-bone type cooling rollers each having a water-cooling type enlarged roller portion at both ends.
Below one cooling roll 1a, the cooling roll 1
a, 1b, the enlarged roller portion is pivotally supported so as to rollably contact both edges of one side of the strip 8, and the other dog-bone type cooling roller 17b is rolled.
Is pivotally supported below the other cooling roll 1b so that the enlarged roller portion can rollably abut against both edges on the other side of the strip (thin sheet material) 8 sent out from the cooling rolls 1a and 1b. ing.

In the twin roll type continuous sheet casting apparatus shown in FIGS. 4 and 5, metal solidified between the cooling rolls 1a and 1b is formed into a strip 8 having a thickness corresponding to the roll gap between the cooling rolls 1a and 1b. At the time, cooling roll 1
a, the enlarged roller portion of one of the dog-bone type cooling rollers 17a is brought into surface contact with both edges of one side of the strip 8 fed from the strip 8 and the other edge of the strip 8 is brought into contact with both edges of the other side of the strip 8. The enlarged roller portion of the dog-bone type cooling roller 17b is brought into rolling contact with the roller, and both edges of the strip 8 are simultaneously cooled from one side and the other side,
The end crack of the strip 8 and the breakage of the strip 8 are suppressed.

[0023]

However, the cooling roll 1 inside the upstream chamber 2 as shown in FIG.
The strip 8 is supplied with helium gas at the downstream side in the strip flow direction of the a and 1b and the upstream side of the pinch rolls 11a and 11b in the strip flow direction inside the downstream chamber 12.
Or a twin-roll type continuous casting facility for cooling the cooling rolls, or as shown in FIG. 4 and FIG. 5, on the downstream side of the cooling rolls 1a and 1b in the strip flow direction, the enlarged roller portions of a pair of dog bone type cooling rollers 17a and 17b In any of the twin-roll type continuous casting equipment, in which both edges of the strip 8 are rollably abutted on both sides of the strip 8 to simultaneously cool both edges of the strip 8 from one side and the other side, a pair of cooling rolls is used. 1a,
The strip 8 may be broken or the end of the strip 8 may be cracked near the roll nip where the outer peripheral surface of the strip 1b is closest.

Therefore, as shown in FIG.
At a production speed of 60 m / min, the relationship between the distance from the roll nip of the cooling rolls 1a and 1b to the thickness of the complete solid-phase shell of the strip 8 is shown in FIG.
The temperature was set at 0 ° C., 500 ° C., 800 ° C., 1000 ° C., and 1200 ° C., and the cooling rolls 1a,
The complete solid shell thickness of the strip 8 within a range of about 800 mm from the roll nip of the strip 1b tends to decrease due to reheating of the unsolidified portion inside the strip 8 as the ambient temperature increases, and the strip 8 And the fact that the end portion of the strip 8 is liable to occur.

The present invention has been made in view of the above circumstances, and provides a twin-roll continuous casting equipment capable of preventing a reduction in the thickness of a complete solid-phase shell of a strip due to reheating of an unsolidified portion. It is intended to be.

[0026]

In order to achieve the above object, in a twin roll continuous casting apparatus according to the present invention, a pinch pinches a strip continuously cast by a pair of cooling rolls. A roll, a chamber surrounding a moving path of the strip from the cooling roll to the pinch roll, and having a seal member that is in air-tight contact with the outer periphery of the cooling roll and the pinch roll, and a pair of nozzles for respectively injecting a cooling gas. One nozzle is arranged inside the chamber so that the cooling gas can be injected from directly below one of the cooling rolls toward one side of the strip located near the roll nip of the cooling roll, and from just below the other cooling roll. In order to inject cooling gas toward the other side of the strip located near the roll nip of the chill roll, the other nozzle is used. It is disposed inside the chamber Le.

In the twin-roll type continuous casting facility according to a second aspect of the present invention, a pair of cooling panels is added to the configuration of the twin-roll type continuous casting facility described in the first aspect of the present invention. One cooling panel is arranged inside the chamber so that the strip can be radiatively cooled from one side immediately below the nozzle, and the other cooling panel can be radiantly cooled from the other side just below the other nozzle. Is located inside the chamber.

In the twin-roll continuous casting apparatus according to the third aspect of the present invention, a plurality of pairs of strips capable of holding strips can be inserted into the twin-roll continuous casting apparatus according to the second aspect of the present invention. A cooling pinch roll in the shape of a low to middle crown is added, and one side of the plurality of pairs of cooling pinch rolls can abut one side of the strip below one cooling panel and the other side of the strip below the other cooling panel The cooling pinch roll is disposed inside the chamber so that the other of the plurality of pairs of cooling pinch rolls can come into contact with the cooling pinch roll.

Further, in the twin-roll continuous casting facility according to claim 4 of the present invention, each of the pair of nozzles in the twin-roll continuous casting facility according to any one of claims 1 to 3 of the present invention. Between the position where the cooling gas is injected toward the strip located near the roll nip of the cooling roll immediately below the cooling roll and the position where the molten metal is not affected by the splash of the molten metal that falls from between the cooling rolls at the start of strip casting. It is configured to be able to move between.

[0030] In the twin-roll continuous casting equipment according to claim 5 of the present invention, each of the pair of cooling panels in the twin-roll continuous casting equipment according to claim 2 or 3 of the present invention is connected to a nozzle. It is configured to be able to move between a position directly below the radiation cooling of the strip and a position not affected by the splash of the molten metal falling from between the cooling rolls at the start of strip casting.

In the twin-roll continuous casting equipment according to claim 6 of the present invention, each of a plurality of pairs of cooling pinch rolls in the twin-roll continuous casting equipment according to claim 3 of the present invention is placed below the cooling panel. At a position where the strip does not receive the influence of the splash of the molten metal that falls from between the cooling rolls at the start of strip casting.

Further, in the twin-roll continuous casting equipment according to claim 7 of the present invention, each of the pair of nozzles in the twin-roll continuous casting equipment according to any one of claims 1 to 6 of the present invention. Is configured such that the range of spraying the cooling gas to the strip is about 200 mm from the roll nip of the cooling roll toward the strip flowing direction.

In any of the twin-roll continuous casting equipment according to the first to seventh aspects of the present invention, a nozzle located immediately below each cooling roll is directed to a strip located near the roll nip of the cooling roll. A cooling gas is injected to prevent a reduction in the thickness of the complete solid-phase shell of the strip due to reheating of the unsolidified portion, thereby preventing the strip from breaking.

[0034] Claims 2, 3 and 5 of the present invention.
In any of the twin-roll continuous casting equipment according to claim 6 and 7, in addition to the pair of nozzles, the strip is radiatively cooled by a cooling panel located directly below each of the nozzles, resulting from reheating of the unsolidified portion. This prevents a decrease in the thickness of the complete solid shell of the strip, thereby more effectively preventing the strip from breaking.

In any of the twin-roll continuous casting equipment according to the third and sixth aspects of the present invention, both edges of the strip are cooled by a plurality of pairs of cooling pinch rolls.
Suppresses the end crack of the strip.

In the twin-roll continuous casting apparatus according to a fourth aspect of the present invention, each of the pair of nozzles is moved to a position not affected by the splash of the molten metal falling from between the cooling rolls. To prevent damage.

In the twin-roll continuous casting apparatus according to the fifth aspect of the present invention, each of the pair of cooling panels is
The splash that falls from between the cooling rolls is moved to a position not affected by the molten metal, thereby preventing damage to the cooling panel.

In the twin-roll continuous casting apparatus according to the sixth aspect of the present invention, each of a plurality of pairs of cooling pinch rolls is moved to a position not affected by the splash of molten metal falling from between the cooling rolls. To prevent damage to the cooling pinch roll.

In the twin-roll continuous casting equipment according to the present invention, the cooling gas is supplied from a pair of nozzles to the strip located within a range of about 200 mm from the roll nip of the cooling roll in the strip flowing direction. Injection prevents the reduction of the thickness of the complete solid phase shell of the strip due to the reheating of the unsolidified portion, thereby reliably preventing the strip from breaking.

[0040]

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

FIG. 1 shows an example of an embodiment of a twin-roll continuous casting apparatus according to the present invention.
The parts denoted by the same reference numerals as those in FIG.

Reference numerals 18a and 18b denote a pair of pinch rolls. The pinch rolls 18a and 18b are disposed below the cooling roll 1a so that the strip 8 delivered from the cooling rolls 1a and 1b can be clamped from above and below. It is located on one side.

Reference numeral 19 denotes a chamber.
From the cooling rolls 1a, 1b to the pinch rolls 18a, 1
8b so as to surround the movement path of the strip 8 up to 8b.

At a predetermined portion of the chamber 19, an inert gas supply port 20 for supplying an inert gas as a non-oxidizing gas into the chamber 19, and a suction connected to a vacuum pump (not shown). A mouth 21 is provided.

Reference numerals 22a and 22b denote sealing members. The sealing members 22a and 22b are provided at the ends of the chamber 19 facing the cooling rolls 1a and 1b so as to be in airtight contact with the outer peripheral portions of the cooling rolls 1a and 1b. It is installed.

Reference numerals 23a and 23b denote sealing members. The sealing members 23a and 23b are pinch rolls 18a and 18b.
The chamber 19 is mounted on the end of the chamber 19 facing the pinch rolls 18a and 18b so as to be in airtight contact with the outer peripheral portion.

These seal members 22a, 22b, 23
A labyrinth seal and a wire seal formed by a large number of metal wires are applied to a and 23b.

24a and 24b are a pair of nozzles. One nozzle 24a is provided with a cooling gas (non-cooling gas) flowing from immediately below one cooling roll 1a to one side of the strip 8 located near the roll nip of the cooling rolls 1a and 1b. The other side of the strip 8 is located inside the chamber 19 so as to be able to inject the active gas), and the other nozzle 24b is located immediately below the other cooling roll 1b and located near the roll nip of the cooling rolls 1a and 1b. It is arranged inside the chamber 19 so that a cooling gas (inert gas) can be injected toward the chamber 19.

The strips 8 of the nozzles 24a and 24b
Injection range of cooling gas to both sides of the jet (spray cooling range)
Has a range of about 200 mm from the roll nip of the cooling rolls 1a and 1b toward the downstream side in the strip moving direction.

Further, the nozzles 24a and 24b are moved by a moving means (not shown) such as a fluid pressure cylinder, a screw shaft and a nut to a strip located immediately below the cooling rolls 1a and 1b near the roll nip of the cooling rolls 1a and 1b. It is possible to move between a position where the cooling gas is injected into the cooling roll 8 and a position which is not affected by the splash of the molten metal that falls from between the cooling rolls 1a and 1b at the start of casting of the strip 8.

The directions of movement of the nozzles 24a and 24b are such that they move close to and away from the strip 8, move along the rotation axis of the cooling rolls 1a and 1b, and center on the horizontal axis or the vertical axis. Any of movement may be used.

In the vicinity of the nozzles 24a and 24b,
A monitoring camera (not shown) for checking whether or not the splash of the molten metal at the start of casting has been cured is installed, so that an apparatus manager can check the state inside the chamber 19. .

Reference numerals 25a and 25b denote a pair of water-cooled cooling panels. One cooling panel 25a is disposed inside the chamber 19 so that the strip 8 can be radiated and cooled from one side immediately below one nozzle 24a. The other cooling panel 25b is disposed inside the chamber 19 so that the strip 8 can be radiated from the other side just below the other nozzle 24b.

Radiation cooling range (radiation cooling range) for both sides of strip 8 of cooling panels 25a and 25b
Is about 600 mm from the downstream end in the strip moving direction of the spray cooling range by the nozzles 24a and 24b to the downstream side in the strip moving direction. Therefore, the radiation cooling range of the cooling panels 25a and 25b is The downstream end in the strip moving direction is the cooling rolls 1a and 1b.
Is located about 800 mm downstream from the roll nip in the strip moving direction.

Further, the cooling panels 25a and 25b are moved by means of moving means (not shown) such as a fluid pressure cylinder, a screw shaft and a nut to a position where the strip 8 is radiated and cooled immediately below the nozzles 24a and 24b.
At the start of casting of the molten metal, it can be moved between a position not affected by the splash of the molten metal falling from between the cooling rolls 1a and 1b.

The direction of movement of the cooling panels 25a and 25b is such that the cooling panels 25a and 25b move close to and away from the strip 8.
Any of a movement along the rotation axis of the cooling rolls 1a and 1b and a movement around a horizontal axis or a vertical axis may be used.

26a, 26b, 27a, 27b, 28
Reference numerals a and 28b denote three pairs of cooling pinch rolls of a water cooling type, and the cooling pinch rolls 26a, 26b, 27a and 27
Each of b, 28a, and 28b is formed in a middle-low crown shape such that the diameter of the middle portion is smaller than that of both end portions.

The three pairs of cooling pinch rolls 26a, 26b,
One of the cooling pinch rolls 26a, 27a, 28a of 27a, 27b, 28a, 28b is provided inside the chamber 19 so as to be able to abut both edges of one side of the strip 8 below one cooling panel 25a. Placed in
Also, the other cooling pinch rolls 26b, 27b, 28b
Are arranged inside the chamber 19 so as to be able to contact both edges of the other side of the strip 8 below the other cooling panel 25b.

One of these cooling pinch rolls 26a, 2
7a, 28a and the other cooling pinch rolls 26b, 27
The inside of the chamber 19 is provided with a hydraulic cylinder 29 so that
a, 29b, 30a, 30b, 31a, 31b are installed, and the fluid pressure cylinders 29a, 29b, 30a, 3
When the fluid pressure is applied to the head side fluid chambers of the cooling pinch rolls 26a, 26b, 27a, 2b, 31a and 31b,
7b, 28a, 28b sandwich the strip 8, and the fluid pressure cylinders 29a, 29b, 30a, 3
When fluid pressure is applied to the rod side fluid chambers of the cooling pinch rolls 26a, 26b, 27a,
7b, 28a and 28b are moved between the cooling rolls 1a and 1b at the start of the casting of the strip 8 to a position not affected by the splash of the molten metal that falls.

The cooling pinch rolls 26a, 26b,
The roll crowns 27a, 27b, 28a, and 28b may have a fixed roll crown, or may be a taper piston type that can appropriately adjust the roll crown.

Reference numeral 32 denotes a threading table. The threading table 32 includes cooling rolls 1a and 1b.
Is formed in a curved plate shape when viewed in the axial direction of the.

The threading table 32 includes cooling pinch rolls 26a, 26b, 27a, 27b, 28
a, 28b, cooling nozzles 24a, 24b, cooling panels 25a, 25b, cooling pinch rolls 26a, 26b, 27a, 27b, 28 below the cooling rolls 1a, 1b.
a guide position (in a state shown by a two-dot chain line in FIG. 1) for guiding the strip 8 moving downward through the space between the pinch rolls 18a and 18b. It is arranged inside the chamber 19 so as to be rotatable between a standby position (a state shown by a solid line in FIG. 1) which is suspended below the position.

Hereinafter, the operation of the twin-roll continuous casting facility shown in FIG. 1 will be described.

The strip 8 is formed by the cooling rolls 1a and 1b.
When casting is continuously performed, a vacuum pump (not shown) connected to the suction port 21 of the chamber 19 is operated to reduce the pressure inside the chamber 19 before the strip 8 is cast. From the active gas supply port 20 to the chamber 19
Is filled with argon gas as a non-oxidizing gas, and the inside of the chamber 19 is kept in a non-oxidizing gas atmosphere (inert gas atmosphere).

Further, each of the nozzles 24a, 24b and the cooling panels 25a, 25b is moved by moving means (not shown).
At the start of casting of the strip 8
The cooling panels 25a and 25b are set in an operation state in advance while being kept at a position where the cooling panels 25a and 25b are not affected by the splash of the molten metal that falls from between a and 1b.

Further, the cooling pinch rolls 26a, 26b,
Each of 27a, 27b, 28a, 28b is provided with a hydraulic cylinder 29a, 29b, 30a, 30b, 31a, 3
By applying fluid pressure to the rod-side fluid chamber 1b, the cooling rolls 1a, 1b
And the cooling pinch rolls 26a, 26b, 27a, 27b, 28a, 28b are activated, and the threading table 32 is described first. To the guided position.

When the preparation as described above is completed, the molten metal is supplied to the space surrounded by the cooling rolls 1a and 1b and the side weirs 16a and 16b to form the molten metal pool 6, and the right side in FIG. Is simultaneously rotated clockwise, and the cooling roll 1b located on the left side in FIG. 1 is simultaneously rotated counterclockwise.

At the start of casting, the cooling rolls 1a, 1
When the splash of molten metal that falls from between b is cured,
The metal solidified between the cooling rolls 1a and 1b is formed into a strip 8 having a thickness corresponding to the roll gap of the cooling rolls 1a and 1b, and is continuously sent out below the cooling rolls 1a and 1b.

On the other hand, as soon as the splash of the molten metal is cured, the nozzles 24a and 24b are moved by the moving means immediately below the cooling rolls 1a and 1b.
The cooling gas is moved to a position where the cooling gas is sprayed to the strip 8 located near the roll nip of a and 1b, and the helium gas is sprayed as cooling gas from the nozzles 24a and 24b. At the same time, the cooling panels 25a and 25b are moved by the moving means. Then, the strip 8 is moved to a position for radiation cooling just below the nozzles 24a and 24b to cool the strip 8 sent from the cooling rolls 1a and 1b.

Further, the fluid pressure cylinders 29a, 29b, 3
0a, 30b, 31a, 31b by applying a fluid pressure to the head-side fluid chambers, one cooling pinch roll 2
6a, 27a, 28a are brought into contact with both edges of one side of the strip 8, and the other cooling pinch rolls 26b, 2
7b and 28b are brought into contact with both edges of the other side of the strip 8 to cool both edges of the strip 8.

Inside the chamber 19 in a non-oxidizing atmosphere, injection cooling by the nozzles 24a and 24b, radiation cooling by the cooling panels 25a and 25b, and the cooling pinch roll 26
The strip 8 cooled by the contact cooling by the a, 26b, 27a, 27b, 28a, 28b is substantially horizontal with the pinch rolls 18a, 1 from the threading table 32.
8b, the pinch rolls 18a, 18b
Is sent out of the chamber 19.

When the strip 8 starts to be sent out of the chamber 19, the threading table 3
2 is rotated to the standby position described above.

Further, using the twin-roll type continuous casting equipment shown in FIG. 1, the cooling rolls 1a, 1 at a production condition of a plate thickness of 2 mm, a production speed of 60 m / min, and an atmospheric temperature of 1200 ° C.
The relationship of the complete solid phase shell thickness of the strip 8 to the distance from the roll nip of b is as follows: when no cooling is performed on the strip 8, when the strip 8 is cooled by jet cooling by the nozzles 24a and 24b, Cooling panel 2 in addition to injection cooling
In the case where the strip 8 is cooled by radiant cooling by the radiating cooling by the cooling pinch rolls 26a, 26b, 27a, and 27 in addition to the jet cooling and the radiating cooling described above.
When each was cooled by contact cooling by b, 28a, and 28b, as shown in FIG.
Cooling rolls 1a, 1b as compared to the non-cooled section
In the section where injection cooling, radiant cooling, contact cooling, etc. were performed in the vicinity of the roll nip, the reduction in the thickness of the complete solid phase shell of the strip 8 due to reheating of the unsolidified portion inside the strip 8 tends to be suppressed. Was presented.

As described above, in the twin-roll continuous casting apparatus shown in FIG. 1, the cooling rolls 1a, 24b are formed by the nozzles 24a, 24b inside the chamber 19 in the non-oxidizing atmosphere.
Injection cooling is performed on the strip 8 located in a range of about 200 mm from the roll nip 1b toward the downstream side in the strip moving direction, and cooling panels 25a, 25
b, radiant cooling is performed on the strip 8 located in a range of about 600 mm from the downstream end in the strip moving direction of the spray cooling range by the nozzles 24a and 24b to the downstream side in the strip moving direction. A pair of cooling pinch rolls 26a, 26b, 27a, 27b, 2
8a, 28b, the cooling panels 25a, 25
b, contact cooling is performed on both edges of the strip 8 located in a predetermined range on the downstream side in the strip moving direction of the radiant cooling range, so that the solid phase shell thickness of the strip 8 due to reheating of the unsolidified portion is reduced. It is possible to prevent the strip 8 from being reduced, and thus to prevent the strip 8 from being broken or the strip 8 from being cracked at the end.

In the twin-roll continuous casting equipment shown in FIG. 1, the nozzles 24a, 24b and the cooling panels 25a, 25
b, cooling pinch rolls 26a, 26b, 27a, 27
Each of the nozzles 24a, 24b can be moved to a position not affected by the splash of the molten metal falling from between the cooling rolls.
b, cooling panels 25a, 25b, cooling pinch roll 26
a, 26b, 27a, 27b, 28a, 28b can be prevented from being damaged.

The twin-roll type continuous casting equipment of the present invention is not limited to the above-described embodiment, and a cooling roll of a taper piston type capable of appropriately adjusting the roll crown is applied. Of course, various changes can be made without departing from the spirit of the present invention.

[0077]

As described above, in the twin-roll continuous casting facility of the present invention, the following various excellent effects can be obtained.

(1) In any of the twin-roll continuous casting equipment according to the first to seventh aspects of the present invention, the strip located near the roll nip of the cooling roll from the nozzle located immediately below the cooling roll. Injecting a cooling gas toward the strip to prevent a decrease in the thickness of the complete solid-phase shell of the strip due to reheating of the unsolidified portion, so that the strip can be prevented from breaking.

(2) In any of the twin-roll continuous casting equipment according to the second, third, fifth, and sixth aspects of the present invention, in addition to the pair of nozzles, each of the nozzles may be directly below each of the nozzles. The radiant cooling of the strip is performed by the cooling panel located at the position (1), and the reduction of the complete solid-phase shell thickness of the strip due to the reheating of the unsolidified portion is prevented, so that the breakage of the strip can be more effectively suppressed.

(3) In each of the twin-roll continuous casting equipment according to the third and sixth aspects of the present invention, since both edges of the strip are cooled by a plurality of pairs of cooling pinch rolls, the end of the strip is cooled. Part breakage can be suppressed.

(4) In the twin-roll continuous casting apparatus according to the fourth aspect of the present invention, each of the pair of nozzles is moved to a position not affected by the molten metal falling from between the cooling rolls. The nozzle can be prevented from being damaged due to the splash of the molten metal at the start of strip casting.

(5) In the twin-roll continuous casting facility according to the fifth aspect of the present invention, each of the pair of cooling panels is
Since it is moved to a position not affected by the molten metal falling from between the cooling rolls, damage to the cooling panel due to the splash of the molten metal at the start of casting of the strip can be prevented.

(6) In the twin-roll continuous casting apparatus according to the sixth aspect of the present invention, each of a plurality of pairs of cooling pinch rolls is moved to a position not affected by molten metal falling from between the cooling rolls. Movement can prevent damage to the cooling pinch roll due to splash of molten metal at the start of strip casting.

(7) In the twin-roll continuous casting apparatus according to the seventh aspect of the present invention, a strip located in a range of about 200 mm from the roll nip of the cooling roll in the strip distribution direction is cooled by a pair of nozzles. Since the gas is injected to prevent a reduction in the thickness of the complete solid phase shell of the strip due to the reheating of the unsolidified portion, the strip can be reliably prevented from being broken.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing an example of an embodiment of a twin-roll continuous casting facility of the present invention.

FIG. 2 is a graph showing a relationship between a distance from a roll nip of a cooling roll and a thickness of a complete solid shell of a strip in the twin-roll continuous casting facility shown in FIG.

FIG. 3 is a conceptual view showing a twin-roll continuous casting apparatus disclosed in Japanese Patent Application Laid-Open No. 3-33053.

FIG. 4 is a conceptual diagram showing a twin-roll type continuous sheet casting apparatus disclosed in Japanese Patent Application Laid-Open No. 5-277654.

FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;

6 shows a relationship between a distance from a roll nip of a cooling roll and a thickness of a complete solid-phase shell of a strip in a twin-roll continuous casting apparatus shown in FIG. 3 or a twin-roll thin-plate continuous casting apparatus shown in FIGS. 4 and 5; It is a graph.

[Explanation of symbols]

 1a, 1b Cooling roll 8 Strip 18a, 18b Pinch roll 19 Chamber 22a, 22b Seal member 23a, 23b Seal member 24a, 24b Nozzle 25a, 25b Cooling panel 26a, 26b Pinch roll 27a, 27b Pinch roll 28a, 28b Pinch roll

Continued on the front page (72) Inventor Shiro Nagata 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries, Ltd. Yokohama Engineering Center (72) Inventor Tatsuo Tsumura Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa No. 1 Ishi Kawashima-Harima Heavy Industries, Ltd. Yokohama Engineering Center (72) Inventor Osamu Takeuchi No. 1, Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa Prefecture Ishi Kawashima-Harima Heavy Industries Co., Ltd. Yokohama Engineering Center (72) Inventor Hisashi Shiro 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries, Ltd. Inside the Yokohama Engineering Center (72) Inventor Heiji Kato 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa, Japan Inside Yokohama Engineering Center (72) Inventor Hisahiko Fukase 1 Kawasaki-Harima Heavy Industries, Ltd. Ishikawajima Harima Heavy Industries, Ltd. 1 Shinnakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa (72) Inventor Atsushi Hirata 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima Harima Heavy Industries, Ltd.

Claims (7)

[Claims] 1. A pinch roll for sandwiching a strip continuously cast by a pair of cooling rolls, and a moving path of the strip between the cooling rolls and the pinch roll, and hermetically sealed around the outer periphery of the cooling roll and the pinch roll. And a pair of nozzles each of which injects a cooling gas, and which can inject the cooling gas from immediately below one of the cooling rolls to one side of the strip located near the roll nip of the cooling roll. As described above, one nozzle is disposed inside the chamber, and the other nozzle is provided in the chamber so that the cooling gas can be injected from directly below the other cooling roll toward the other side of the strip located near the roll nip of the cooling roll. A twin-roll continuous casting facility, which is located inside a continuous roll. 2. A cooling panel comprising a pair of cooling panels, wherein one of the cooling panels is disposed inside the chamber so that the strip can be radiatively cooled from one side immediately below one of the nozzles.
The twin-roll continuous casting facility according to claim 1, wherein the other cooling panel is disposed inside the chamber so that the strip can be radiatively cooled from the other side immediately below the other nozzle. 3. A plurality of cooling pinch rolls each having a pair of middle and low crowns each capable of holding a strip, and one of the plurality of cooling pinch rolls abuts one side of the strip below one cooling panel. 3. The twin roll according to claim 2, wherein a cooling pinch roll is disposed inside the chamber so that the other of the plurality of pairs of cooling pinch rolls can be brought into contact with the other side of the strip below the other cooling panel. Type continuous casting equipment. 4. A molten metal falling from a position where a pair of nozzles are injected with a cooling gas toward a strip located near a roll nip of the cooling roll immediately below the cooling roll and between the cooling rolls at the start of strip casting. The twin-roll continuous casting equipment according to any one of claims 1 to 3, wherein the twin-roll continuous casting equipment is configured to be able to move between a position not affected by the splash. 5. Each of the pair of cooling panels is positioned between a position where the strip is radiatively cooled immediately below the nozzle and a position where the position is not affected by the splash of the molten metal falling from between the cooling rolls at the start of strip casting. The twin-roll continuous casting equipment according to claim 2 or 3, wherein the twin-roll continuous casting equipment is configured to be movable. 6. A plurality of pairs of cooling pinch rolls each having a position below the cooling panel which abuts the strip and a position which is not affected by the splash of molten metal falling from between the cooling rolls at the start of strip casting. 4. The twin-roll continuous casting equipment according to claim 3, wherein the equipment is configured to be able to move between them. 7. The nozzle according to claim 1, wherein each of the pair of nozzles is configured such that a range of spraying the cooling gas to the strip is about 200 mm from a roll nip of the cooling roll toward a direction in which the strip flows. The twin-roll continuous casting equipment according to any one of the above.