JPH07124704A - Horizontal continuous casting method and apparatus thereof - Google Patents

Abstract

PURPOSE:To cast a round cross sectional cast billet having good roundness even by executing high pressure drawing drive to roll pair for improving the surface and the internal qualities of the cast billet. CONSTITUTION:The roll pairs 11A-11E in the drawing device for executing drawing drive to the cast billet 5 fed out of a mold, are arranged in plural seats so as to separate some interval in the casting direction. The contacting points of these roll pairs 11A-11E to the cast billet 5 are shifted in the peripheral direction in order so that each pair of the roll pairs 11A-11E are not brought into contact with the same position on the peripheral surface of the cast billet 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal continuous casting method and apparatus for continuously casting a long slab by intermittently withdrawing a slab having a circular cross section in the horizontal direction.

[0002]

2. Description of the Related Art A horizontal continuous casting apparatus in which a tundish and a mold are hermetically joined has a merit that since a molten metal static pressure at a solidification starting point is large, a cast piece having a circular cross section can be easily cast. There is. By the way, in a conventional general continuous horizontal casting apparatus of this type, the contact point between the slab of the roll pair for driving the reduction in the plurality of sets (usually two sets) of drawing devices arranged at intervals in the casting direction is They were configured to be the same in the circumferential direction.

Further, as a drawing apparatus of this type of horizontal continuous casting apparatus, there is known a drawing apparatus which draws a slab having a circular cross section by pulling down a plate-shaped body instead of a roller pair. (For example, Japanese Patent Laid-Open No. 1-258081
(See the official gazette).

[0004]

In the comparison of the above-mentioned prior arts, the roll type using a pair of rolls is superior to the one using a plate-shaped body in terms of drawing accuracy, and the roll type is superior. Many are in practical use.

However, according to the horizontal continuous casting method using a roll-type drawing device, a plurality of roll pairs in the drawing device are always in contact with the same location on the peripheral surface of the slab, so that a multistage type or a high pressure under light pressure is applied. In either case of the lower stage type, the amount of deformation of the cast slab is large and the roundness is likely to collapse. In particular, in order to improve the surface quality and internal quality (segregation) of the slab, it is desirable to increase the amount of deformation and drive the drawing under high pressure. It is difficult to obtain the roundness of the slab.

Further, it is conceivable to separately arrange the forging device and the drawing device for obtaining the roundness of the slab in the casting direction, but in this case, devices having different functions such as the forging device and the drawing device are used. Since it is necessary to provide them separately in the casting direction, the size of the entire equipment tends to increase.

The present invention has been made in view of the above circumstances, and a horizontal continuous casting method capable of obtaining a slab with good quality and roundness by using a roll pair driven to be pulled out under high pressure. And its device.

[0008]

In order to achieve the above object, a horizontal continuous casting method according to the present invention is a method in which a slab having a circular cross section is intermittently withdrawn in a horizontal direction from a mold which is hermetically joined to a tundish to obtain a long length. A horizontal continuous casting method for continuously casting a slab, at intervals in the horizontal casting direction,
A plurality of pairs of rolls, which are arranged to face each other in the diametrical direction of the slab and are driven for reduction, are driven to intermittently pull out the slab while sequentially shifting the contact points in the circumferential direction.

In the horizontal continuous casting apparatus according to the present invention, the tundish, the mold hermetically joined to the tundish, and the slab having a circular cross section delivered from the mold are brought into contact with each other and driven to be pressed down. In a horizontal continuous casting apparatus having a drawing device formed by arranging a plurality of roll pairs at intervals in the casting direction, the contact points with the slabs of the roll pairs in the plurality of drawing devices are arranged in the circumferential direction. It is a shifted one.

Further, as in the horizontal continuous casting apparatus according to the third aspect of the invention, a plurality of roll pairs of the drawing apparatus are arranged so as to come into contact with the slab in which the unsolidified region remains. Preferably.

Further, as in the horizontal continuous casting device according to the invention of claim 4, as a plurality of roll pairs of the drawing device, an arc-shaped groove or caliber groove having a radius slightly larger than the radius of the slab is provided. Is preferably used.

[0012]

According to the first and second aspects of the present invention, the pulling-out drive is performed while sequentially shifting the contact points of the plurality of roll pairs with respect to the peripheral surface of the cast slab having a circular cross section fed from the mold in the circumferential direction. Even if the pressing pressure by each roll pair is increased so as to improve the surface quality and internal quality (segregation) of the slab, it becomes possible to obtain a slab with good roundness.

Further, according to the third aspect, each roll pair of the drawing device comes into contact with the slab in which the unsolidified region remains, so that the deformation amount when passing through the roll pair is increased, It is possible to enhance the improvement effect of internal quality.

Further, according to claim 4, it is possible to increase the contact area of each pair of rolls of the drawing device with the slab, and it is possible to reduce the number of installation of the drawing device.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a horizontal continuous casting apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a ladle, and the molten metal held here is held in a tundish 2 arranged below the ladle. To be done. Reference numeral 3 denotes a mold, which is generally composed of a mold tube that serves as a strong cooling portion and an adjustable mold that serves as a slow cooling portion, and is hermetically joined to the tundish 2. Four
Is a drawing device, which continuously draws a long slab by intermittently withdrawing a slab 5 having a circular cross section sent from the mold 3 along a support roll 6 in the horizontal direction. Reference numeral 7 denotes a torch type cutter, which cuts the long slab 5 drawn by the drawing device 4 into a predetermined length, and the slab after cutting is supplied to the cooling bed 9 via the roller table 8.

The drawing device 4 is composed of five stages of drawing roll units 4A, 4B, 4C, 4D, and 4E installed at appropriate intervals in the horizontal casting direction, and the drawing rolls of each stage. Units 4A-4E
2 and 3, as shown in FIG. 2 and FIG. 3, roll pairs 11A and 11 are arranged to face each other in the diametrical direction of the slab 5.
B, 11C, 11D, 11E and these roll pairs 11A
To 11E are pressed against the peripheral surface of the slab 5, respectively, and the drive mechanisms 12A, 1 for rotating and driving the rolling mechanisms 11A, 10B, 10C, 10D, 10E and the roll pairs 11A through 11E.
2B, 12C, 12D, 12E and unit underframe 13
It is composed of A, 13B, 13C, 13D and 13E.

In each of the above-mentioned rolling-down mechanisms 10A to 10E, in a state in which one roll 11A to 11E is rotatably supported, rocking frames 15A to 15E and a rocking frame 15A to 15E mounted so as to be rockable around the horizontal support shafts 14A to 14E and The rocking frames 15A to 15E are composed of hydraulic cylinders 16A to 16E that rock and drive the support shafts 14A to 14E, and the drive mechanisms 12A to 12E include roll pairs 11A to 11E.
17A to 17E attached to one end of the roll shafts 11a to 11e so as to drive the motors separately, and drive motors 18A to 18 directly connected to the speed reducers 17A to 17E.
E, and each of the rolls 11A to 11E described above.
Have arcuate grooves 11a1 to 11e1 each having a radius slightly larger than the radius of the cast piece 5.

The above five-stage drawing roll unit 4A-
4E, as shown in FIG. 4, each roll pair 11A
To 11E are arranged so that the contact points with the cast slab 5 are shifted by 22.5 ° in the circumferential direction, and the drawing device 4 is composed of these five-stage drawing roll units 4A to 4E.
Is installed at a position where each of the roll pairs 11A to 11E comes into contact with the slab 5 in which an unsolidified region remains.

Next, a horizontal continuous casting method using the horizontal continuous casting apparatus having the above-mentioned structure will be described. The molten metal of the ladle 1 is held in the tundish 2 arranged below the ladle 1, and then flows into the mold 3. This mold 3
Inside, the slab 5 that has been cooled and solidified and shaped into a substantially circular cross section is sent out, and the long slab 5 is continuously cast by intermittently withdrawing horizontally along the support roll 6. Next, the long slab 5 is cut into a predetermined length by a torch cutter 7, then passed through a roller table 8 and supplied to a cooling bed 9 to be cooled.

Here, on the peripheral surface of the cast piece 5 passing through the drawing device 4, there are five stages of drawing roll units 4A to 4A.
The roll pairs 11A to 11E in 4E are pressed respectively via the rolling-down mechanisms 10A to 10E, and the pressed roll pairs 11A to 11E are driven by the drive mechanism 12A.
When the long slab 5 is driven to rotate through .about.12E, the long slab 5 is pressed down and its deformation amount is increased to improve the surface quality and the internal quality, while being intermittently driven in the horizontal direction. Further, at the time of this pulling drive, the contact points of the roll pairs 11A to 11E with respect to the slab 5 are sequentially displaced in the circumferential direction, as shown in exploded views in FIGS. 5 (a) to 5 (e). Therefore, the slab 5 is not largely deformed in one direction, and the slab 5 having a good roundness can be obtained.

In the above embodiment, as the roll pairs 11A to 11E in each of the drawing roll units 4A to 4E, the arcuate groove 11 having a radius slightly larger than the radius of the cast piece 5 is used.
A grooved roll having a1 to 11e1 was used.
And as shown in FIG. 7, caliber grooves 11a2-11e
2 may be used, and in this case, as shown in FIG. 7, since the contact area with the slab 5 of each roll pair 11A to 11E can be made large, the number of installation stages of the drawing roll unit should be reduced. Is possible.

Further, instead of the grooved roll as shown in the above embodiment and the caliber grooved roll shown in FIGS. 6 and 7, as shown in FIG. 8, a cylindrical roll which comes into point contact with the cast slab 5. You may use 11A-11F. In this case, two sets of roll pairs facing each other in the diametrical direction of the cast slab 5, that is, a total of four rolls are arranged in the six-stage drawing roll units 4A to 4F so that the contact points are displaced by 15 ° in the circumferential direction. By doing so, it is possible to achieve the same function as in the above embodiment.

Further, in the above embodiment, the roll pairs 11A to 11E in the pull-out roll units 4A to 4E are used.
Although the interval between the rolls is constant and invariable, as shown in FIGS. 9 and 10, each roll pair 4A to 4E is
It is also possible to use a configuration in which the interval of is adjustable. In FIGS. 9 and 10, 19 is a roll gap stopper disc fixed to one end of the roll shaft of the movable roll, 20 is fixed to one end of the roll shaft of the fixed roll, and its peripheral surface is for the roll gap stopper. An eccentric disc for a roll interval stopper that abuts on the circumferential surface of the disc 19 and a cylinder 21 for rotationally displacing the eccentric disc 20 for a roll interval stopper around an eccentric shaft 22. The distance between the roll pairs 11A to 11E can be adjusted by rotationally displacing the distance stopper eccentric disk 20 around the eccentric shaft 22. By using a drawing roll unit having such a roll gap adjusting mechanism, it is possible to apply it to continuous casting of a plurality of types of cast slabs 5 having different cross-sections having different diameters.

[0024]

As described above, according to claims 1 and 2 of the present invention, the contact points of a plurality of roll pairs with respect to the peripheral surface of the cast slab having a circular cross-section delivered from the mold are sequentially arranged in the circumferential direction. Since they are misaligned, it is possible to obtain a slab with good roundness even if the rolling pressure is increased by each roll pair to drive the slab to improve the surface quality and internal quality (segregation) of the slab. . Further, even if the high-temperature slab at the time of casting has a low hot strength and a large amount of deformation, the slab having a good roundness can be obtained because the contact points are displaced. Further, since the roll pair of the pulling device exerts the function of the forging device, it is not necessary to separately install the forging device, and it is easy to simply configure the entire equipment.

According to the third aspect, each roll pair of the drawing device is brought into contact with the slab in which the unsolidified region remains, thereby increasing the deformation amount when the roll pair passes. The improvement effect of internal quality can be enhanced.

Further, according to the fourth aspect, it is possible to increase the contact area of each pair of rolls of the drawing device with the slab, and it is possible to reduce the number of installation of the drawing device.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a horizontal continuous casting apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged front view of a pulling roll unit in the pulling device.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a front view of an essential part for explaining the arrangement of a roll pair of five stages.

FIG. 5 is a front view of a main part for explaining a contact state between a roll pair in each stage and a cast piece.

FIG. 6 is a front view of a main part for explaining the arrangement of rolls in five stages when using a caliber grooved roll.

FIG. 7 is a front view of a main part for explaining a contact state between a roll pair in each stage and a cast piece in the case of FIG. 6;

FIG. 8 is a front view of a main part for explaining a contact state between a pair of roll pairs at each stage and a cast piece when a cylindrical roll is used.

FIG. 9 is an enlarged front view of a pulling roll unit in a pulling device according to another embodiment of the present invention.

10 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 2 Tundish 3 Mold 4 Drawing device 4A to 4F Drawing roll unit 11A to 11F Roll pair 11a1 to 11e1 Arc-shaped groove 11a2 to 11e2 Caliber groove

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[Procedure amendment]

[Submission date] November 2, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Oath

[Correction content]

[Claims]

4. The horizontal continuous casting device according to claim 2, wherein each roll pair of the drawing device has an arcuate groove or a caliber groove having a radius slightly larger than the radius of the slab. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 9, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

4. The horizontal continuous casting device according to claim 2, wherein each roll pair of the drawing device has an arcuate groove or a caliber groove having a radius slightly larger than the radius of the slab. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 16, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Claims (4)

[Claims] 1. A horizontal continuous casting method for continuously casting a long slab by intermittently withdrawing a slab with a circular cross section horizontally from a mold which is hermetically joined to a tundish. A plurality of pairs of rolls, which are spaced apart from each other and are opposed to each other in the diametrical direction of the slab and are driven to be rolled down, are driven to be intermittently pulled out while sequentially shifting the contact points with respect to the slab. Characteristic horizontal continuous casting method. 2. A tundish, a mold hermetically joined to the tundish, and a pair of rolls which are driven to be pressed down by contacting with a diametrical position of a slab having a circular cross-section delivered from the mold and spaced apart in the casting direction. In a horizontal continuous casting apparatus equipped with a plurality of sets of drawing devices arranged horizontally, the horizontal continuous casting device is characterized in that the contact points with the cast pieces of the plurality of roll pairs in the drawing device are shifted in the circumferential direction. Casting equipment. 3. The horizontal continuous casting apparatus according to claim 2, wherein the drawing device is arranged so that each pair of rolls comes into contact with a slab in which an unsolidified region remains in the slab. 4. The horizontal continuous casting device according to claim 2, wherein each roll pair of the drawing device has an arcuate groove or a caliber groove having a radius slightly larger than the radius of the slab.