JP2938986B2 - Slab transfer method in twin roll thin sheet casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a thin plate slab by continuous twin roll type thin plate continuous casting.

[0002]

2. Description of the Related Art According to twin roll thin sheet casting, a thickness of 1
A slab of thin metal strip of ~ 3 mm is obtained. Therefore, a thin metal sheet that is difficult to roll can be obtained. Further, when a thinner metal sheet is produced by rolling, the rolling process can be greatly simplified because the amount of reduction is small. However, in twin-roll type thin plate casting, particularly in twin-roll type thin plate casting of a fragile metal, there is a problem that a slab is easily broken just below the twin rolls.

[0003] Fig. 2 is an explanatory view of the formation of a slab in twin roll thin sheet casting. The molten metal 5 is poured into the pool 2 formed by the twin rolls 1-1 and 1-2 rotating in the direction of arrow 8 and the side dam 17. The molten metal is cooled by twin rolls to form solidified shells 3-1 and 3-2. The solidified shells 3-1 and 3-2 are integrated into a cast piece 6 and taken out from the minimum gap 4 of the twin roll. The solidified shells 3-1 and 3-2 are integrated with each other at the minimum gap 4.

FIG. 3 is an explanatory view of a conventional example in which the manufactured slab 6 is conveyed to a winding machine 9. FIG. 3A shows an example in which the loop 10 is formed immediately below the twin roll. At this time, loop 10
The weight of the slab 6 is the slab immediately below the minimum gap 4. However, as described above, in the case of a brittle metal, the slab immediately below the minimum gap 4 is fragile and cannot withstand the weight of the loop 10, and the slab is easily broken immediately below the minimum gap 4. . In FIG. 3A, for example, 14-1 immediately below the twin rolls
It is also conceivable to provide a pinch roll and to support the slab by sandwiching the slab with the pinch roll. However, since the slab is brittle, if the pinching force is strong, the slab breaks along the arrow.

FIG. 3B shows a slab conveying device described in Japanese Patent Application No. 2-101573. In FIG. 3 (B), the strip-shaped slab 6 is sent out onto the slide guide 11 and slides on the slide guide 11 from above to below, and thereafter is pulled by the pinch roll 18 and the winding machine 9 to be wound up. Machine 9.
According to this device, the weight of the strip-shaped slab 6 is reduced by the sliding guide 11.
Grinning For this reason, the weight of the slab corresponding to the fragile slab immediately after the twin rolls are released is greatly reduced, and the slab is prevented from breaking. However, as described below, the slab is not completely prevented from being broken only by this transfer device.

FIG. 3 (C) is an explanatory view of an example in which the speed of pulling out the strip-shaped slab from the slide guide 11 is slightly too high in the transfer device of FIG. 3 (B). In this case, the support start position of the strip-shaped slab on the slide guide 11 is 11- in FIG.
The process moves from 1 to 11-2 in FIG. When the bearing start position moves to 11-2, the strip-shaped slab 6 from the minimum gap 4 to the support start position becomes too long, and the weight of the slab immediately after leaving the twin rolls becomes excessive, This may cause the slab to break. Although not shown, according to the knowledge of the present inventors, if the speed of taking out the strip-shaped slab 6 from the slide guide 11 is slightly too low, a compressive stress acts on the strip-shaped slab 6, and 4 in FIG.
The slab between 11 and 11-1 is laterally bent, and this lateral fold also causes the strip-shaped slab 6 to break.

In the twin-roll type continuous casting of a thin sheet, the twin-roll
-1 and 1-2 are rotated at a high peripheral speed of, for example, 30 m / min. Also, as described in FIG.
The solidified shells 3-1 and 3-2 are integrated at a minimum gap, and for this purpose, the rotation speed of the twin rolls 1-1 and 1-2 is frequently changed. The pinch roll is adjusted to a speed synchronized with the peripheral speed of the twin roll. For this reason, in FIG. 3 (B), the pinch roll adjusts the speed at high speed and frequently, and pulls the strip-shaped slab 6. When the rotation speed of the pinch roll is slightly too fast or slightly slow as described above, it causes breakage as described above.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a slab for twin-roll type thin plate casting, which can stably convey a strip-shaped slab sent from a twin roll to a winding machine without breaking. The task is to provide a transport method.

[0009]

FIG. 1 is an explanatory view of a sliding guide according to the present invention. In FIG. 1 (A), the sliding guide 1
In 1, the upper end P is disposed below and close to the twin rolls. The sliding guide 11 is inclined or curved and the other end (lower end) Q is disposed below. In this specification, the inclination or the curved inclination is collectively referred to as an inclination. The strip-shaped slab 6 is slipped from the twin rolls 1-1 and 1-2 by a sliding guide 11.
It is sent upward and slides downward from above on the slide guide 11 to reach the lower end Q. Rear surface of lower end Q of sliding guide 11
On the right side of FIG. 1, a not-shown conventional roller group 14, a pinch roll 18, and a winder 9 of FIG. 3, for example, are arranged. Convey to the winding machine. In the present invention, the inclination angle of the slide guide can be changed and adjusted by moving the lower end Q of the slide guide in the direction of arrow 12 around the upper end P of the slide guide. This change adjustment is achieved by raising and lowering the lower end Q of the sliding guide using known mechanical, hydraulic and electrical means.

As described above, if the rotation speed of the pinch roll 18 is too high in FIG. 3B, the support starting point of the strip slab 6 moves to 11-2 in FIG. This causes the piece 6 to break. In the present invention, FIG.
The sliding guide is moved in the direction of the dotted arrow 12 to set it at the position of 11 '. When the slide guide is moved in this way,
The length of the strip-shaped slab from the minimum gap portion 4 to the bearing start point can be prevented from being suddenly increased, and therefore, the slab can be prevented from breaking.

A contact or non-contact detection end, for example, which can detect the presence or absence of contact between the strip-shaped slab 6 and the slide guide 11, is disposed near the bearing start point of the slide guide 11.
When the slide guide 11 is moved and adjusted based on the information from the detection end, the strip-shaped slab 6 (6-1, 6-2) is always sufficiently supported by its own weight by the slide guide 11, and is sent out from the minimum gap portion 4. The cast slab immediately after being dropped does not have excessive self-weight.

In the present invention, when compressive stress is generated in the strip slab, point Q in FIG. 1A is moved in the direction of the solid arrow.
Although the running path of the strip slab (not shown) is extended, the compression stress of the strip slab 6 is eliminated by the movement of the sliding guide,
This prevents the strip-shaped cast slab described with reference to FIG.

FIG. 1B shows an example in which the lower end Q of the slide guide is used as an axis and the upper end P of the slide guide is moved in the direction of arrow 12 to change and adjust the inclination angle of the slide guide. In this case as well, it is clear from the above description that the strip-shaped slab can be prevented from being broken, as described with reference to FIG.

According to a second aspect of the present invention, the inclination angle of the sliding guide is changed and adjusted, and the rotation speed of the pinch roll 18 shown in FIG. I do. In FIG. 1 (A), the inclination of the slide guide 11 is changed to an angle α and adjusted to 11 ′, and the strip-shaped
By running as shown in 2, the breakage of the strip-shaped slab can be prevented as described above. However, it is preferable to return the slide guide from the position 11 'to 11 because, for example, a difference in height occurs with the pass line of the transport roll group 14 shown in FIG. 3B provided on the rear surface of the slide guide. . In this case, the rotation speed of the pinch roll 18 is changed so as to be slower in accordance with the change amount α of the inclination angle, but the change of the rotation speed of the pinch roll 18 causes the strip-shaped slab 6 to slide. Is gradually extended and the inclination angle α becomes smaller, and the slide guide returns to the position 11 from the position 11 ′. The second embodiment of the present invention relates to a method for manufacturing a belt-like cast strip shown in FIG.
-2 is returned to the original runway 6-1. The adjustment of the rotation speed of the pinch roll is performed when the slide guide is changed from the initial set position 11 to a position 11 'which is more preferable for operation. In addition, an extremely favorable effect is achieved.

For example, in FIG. 3B, a method of adjusting the contact start position by changing only the rotation speed of the pinch roll 18 without changing the inclination of the slide guide 11 is considered.
However, according to the knowledge of the present inventors, in this method, since there is no quantitative measure serving as a guideline for changing the rotation speed of the pinch roll 18, the amount of change in the rotation speed becomes excessively large or too small, and thus the method becomes smooth. Adjustment is difficult. In the method of the present invention, the belt-shaped cast piece is quickly supported by changing the inclination angle of the slide guide, and the rotation speed of the pinch roll 18 is adjusted using the amount of change in the tilt angle as a guide.
Can be smoothly controlled, and therefore, an excellent effect of preventing the strip-shaped slab from breaking can be obtained.

In the present specification, the means for adjusting the conveying speed of the strip-shaped slab 6 and sending it to the conveyor is collectively referred to as a pinch roll.
For example, a conventional bridle roll, a take-up roll, or the like also has the same operation and effect as the above-described pinch roll. Therefore, the pinch roll of the present invention includes these various rolls.

[0017]

According to the method of the present invention, the slab immediately after being discharged from the twin rolls is not subjected to excessive tensile stress or compressive stress, and therefore, the high temperature immediately after being discharged from the twin rolls. And can be transported to a winding machine without breaking the brittle slab.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of the present invention, FIG. 2 is an explanatory view of forming a slab in twin-roll type continuous casting of a thin sheet, and FIG. 3 is an explanatory view of a conventional example of conveying a slab to a winding machine.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideya Kuraya 1-1-1 Emitsu, Yawatahigashi-ku, Kitakyushu-shi, Fukuoka Nippon Steel Corporation Equipment Engineering Division (56) References JP-A-4-4952 ( JP, A) JP-A-4-266460 (JP, A) JP 7-106435 (JP, B2) JP 8-24999 (JP, B2) JP 7-47165 (JP, Y2) JP Hei 5-15404 (JP, Y2) Jikken Hei 7-44359 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) B22D 11/06 330

Claims (2)

(57) [Claims] 1. A twin-roll continuous casting machine having a sliding guide having an upper end disposed close to the twin rolls below the twin rolls and a lower end inclined obliquely downwardly, wherein the sliding guides are pivoted about the upper end. Alternatively, a slab conveying method in a twin-roll type thin plate casting method, wherein a slab sent from a twin roll is supported by changing a tilt angle around a lower end. 2. A twin-roll continuous casting machine having a sliding guide having an upper end located below the twin rolls close to the twin rolls and having a lower end inclined obliquely downward and having a lower end as an axis. Alternately, the tilt angle is changed around the lower end to support the cast piece fed from the twin roll, and the rotation speed of the pinch roll is adjusted according to the change in the tilt angle of the slide guide. A slab transport method in thin sheet casting.