JPS63157743A - Twin roll continuous casting machine - Google Patents

Abstract

PURPOSE:To freely enable change of thickness and width for continuously cast slab by moving a moving roll to a fixed roll in a twin roll continuous casting machine toward the axial direction and the right angle direction to the axial direction. CONSTITUTION:The one side roll 1 in the twin roll type continuous casting machine, is fitted as fixing at the fixed position to the fixed frame 4 through a bearing box 5 as the fixed roll. The moving roll 2 facing it is fitted to a moving frame 8 by a bearing box 6 and screw shaft 7. Side dams 21, 24 for forming a pouring a pouring basin together with both rolls 1, 2 are fitted respectively to the moving frame 8 and the fixed frame 4. In case of moving the moving frame 8 along axial direction X by rotating a motor 14, the width of continuously cast slab can be changed and in case of moving the moving frame 8 toward the axial direction X and the right angle Y direction by rotating a motor 20, the gap 3 of both rolls 1, 2 can be changed, to be able to freely change the width of continuously cast slab.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a twin-roll continuous casting machine that allows the width and thickness of a slab to be changed even during continuous casting.

(Prior art) In the twin roll continuous casting machine of the prior art,
0-64755, as shown in Fig. 6, when one roll (at) is moved in the horizontal direction perpendicular to the axial direction with respect to the other roll (b), the thickness of the slab is reduced during casting. In addition, as shown in Fig. 8 of JP-A-60-118355 f'i, by moving the side dam (cl) in the axial direction, the slab fd + Only the width can be changed.

(Problems to be Solved by the Invention) In the above-mentioned prior art, in the case of JP-A-60-64753,
Although the thickness of the slab can be changed, the width of the slab cannot be changed at the same time. Regarding the change in slab thickness, for example, if an attempt is made to increase the slab thickness from (tθ to ) and the counter roll [al] become narrower, so
The upper limit of the molten steel pool in the casting space decreases by Δh. In continuous casting, it is important to keep the level constant and to prevent the meniscus level from changing. However, in this patent, in order to change the thickness of the slab, the upper limit of the depth of the molten metal is used. It is necessary to reset the initial value of the hot water level in response to changes in the temperature, making operation difficult.

In the case of JP-A-60-118555, the width of the slab can be changed, but the thickness of the slab cannot be changed at the same time.

Even if you stop changing the slab width, the depth of the molten steel pool in the casting space does not change, but if you try to change the slab thickness, as shown in Figure 9 (
As shown in the changes from a) to (b), a gap (f) is created between the peripheral surfaces of the roll and the side tom, and molten steel flows out. Therefore, it is impossible to change the slab thickness without changing the side dams.

Does the present invention solve the above problems of the prior art? It is an object of the present invention to provide a twin-roll continuous casting machine that can change the trap slab thickness and slab width during casting, and can also change them simultaneously.

(Means for Solving the Problems) In order to achieve the above object, the present invention relates to a twin-roll continuous casting machine, in which one of the rolls is fixed and the other is movable,
The following configuration is provided with a side dam that can be moved to a predetermined position independently of the relatively moving roll.

That is, in the twin-roll continuous casting machine of the present invention, a pair of rolls are arranged horizontally in parallel as casting rolls, and the upper part of the gap between the two rolls is used as a casting space in which the molten metal to be cast is reserved. Regarding a twin-roll mold in which the slab that has started to solidify is pulled out below the gap between the rolls and both rolls rotate synchronously, one roll is supported at a fixed position on a fixed frame, and the other roll is supported on a moving frame. In addition to being movable in the axial direction and the horizontal direction perpendicular to the axial direction, both side dams at the ends are installed independently of the roll (
D is characterized by being movably provided.

The side dam extending from the movable roll side is made independent of horizontal movement perpendicular to the axial direction of the movable roll, but is made to move together with the circular direction movement of the movable roll. The side dam extending from the fixed roll side is independent of the fixed roll and follows the movement of the movable roll in the horizontal direction perpendicular to the axial direction.

(Examples and Effects) The present invention will be specifically described below based on examples with reference to FIGS. 1 to 5. FIG. 1 is a perspective view of the main body of a twin-roll continuous casting machine according to an embodiment of the present invention, and FIG. 2 is a plan view of the entire machine including its drive system.

A pair of casting rolls (1) and (2) are arranged side by side with a distance (3) between them under horizontal parallel axes. RF3 between both rolls)
The molten metal to be cast is held in the upper part of the space as a storage space, and the slab that has been cooled and started to solidify by both rolls (1) and L2) is pulled out below the distance between the rolls, and both rolls rotate in synchronization. O, which is a twin-roll configuration mold, one roll (1) is supported at a fixed position with respect to a fixed frame (4) via bearing boxes +5) (5) on both sides, and is used as a fixed side roll. The other roll (2) is supported by a moving frame (8) at the rear via bearing boxes (6) [6] and screw shuts (7) on both sides, and becomes a moving roll.

The movable roll (2) is also supported horizontally by the fixed frame (4) via sliding bushes (9) at both ends, and is horizontally moved so that the moment due to the weight of the roll does not act on the fixed frame. It is designed to guide the movement smoothly.

The movable frame (8) supporting the movable roll (2) is attached with ICIs (10) at both ends and is supported by the fixed frame (4) via the sliding bushes (11) (Iυ).

The shaft α[J on the right side of the figure has a screw, and is moved in the roll axis direction (X) by driving a screw jack O■ that is screwed into the shaft through a shaft o1 with a motor circle for changing the slab width.

The above-mentioned screw shaft [7] (7) that supports the movable roll (2) is supported by the movable frame (8) via the bush 06 (lυ), and the screw jack αaQ that is screwed thereon is connected to the shaft σ. , spline (to), shaft Ql, and is driven by a motor for changing slab thickness to move in the horizontal (Y) direction perpendicular to the roll axis direction. At this time, the screw shirts at both ends of the roll)
7) The roll (2) for moving in synchronization with the a-shut Cl 71 is always kept parallel to the roll (1).

Referring to FIG. 6, the side dam at one end is bolted to the side of the movable gnome (8) via the support bar (A).

Referring also to Figure 4, the side dam (C) at the other end is movably supported by penetrating the bushing (A) of the fixed frame (4) via the support bar (C), and is supported by a spring (F).
The structure is such that it is always biased in the direction of pressing against the roll (2).

These side dams? I penalty rolls (1) (2) are placed directly alongside the end face or slide in a groove cut near one end of the roll as shown in Figure 5 (a), but as shown in Figure 5 (b) It has a structure that slides between the roll end face and the presser ring 4,
Correspondingly, the side dam has a side shape as shown in FIGS. 6 and 4.

In the apparatus of the present invention having the above configuration, when the movable frame (8) is moved in the axial direction (x) by the slab width changing motor α→, the movable side roll (2) and the side dam υ are also moved. Since the distance in the X direction of the casting space between the side dams Qυ(c) is changed, the slab width can be changed. At this time, the stationary side dam 0υ is kept in the state shown in FIG. 3, and the movable side dam is kept in the state shown in FIG. 4.

When the movable roll (2) is moved in the perpendicular horizontal direction (y) by the slab thickness changing motor a, the roll interval (3) is changed and the slab thickness can be changed.

In this way, even if the slab width and slab thickness are changed, the depth of the molten metal in the casting space remains the same from the roll center line to the roll top, and therefore the molten metal level does not change. Furthermore, since the side dam ■υ(c) is maintained in contact with the peripheral surface of the roll, no gap is created that would cause leakage of weld metal. The slab width and slab thickness can be changed individually or both at the same time.

(Effects of the Invention) As described above, according to the twin-roll continuous casting machine of the present invention, the width and thickness of the slab can be changed even during continuous casting.

At that time, the depth of the pool in the casting space does not change, making it easy to control the amount poured.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main body of a twin-roll continuous casting machine according to an embodiment of the present invention, FIG. 2 is a plan view of the entire machine including its drive system, and FIG.
The figure is a partial sectional view taken along the line m-$ in Fig. 2, and Fig. 4 is a partial cross-sectional view taken along the line M-$ in Fig. 2.
■ Line partial sectional view, Figure 5 (a) is a diagram showing an example of the contact state between the side dam and the roll, Figure 5 (b) is a diagram showing the other side, and Figure 6 is an example of the conventional technology. A plan view, Fig. 7 is a diagram showing changes in the condition of the hot water pool, Fig. 8 is a perspective view showing a conventional pond row, and Fig. 9 (a) is a diagram showing one situation of the side dam and roll. , FIG. 9(b) is a diagram showing other situations. (1)... Fixed side roll, (2)... Moving side roll, (
3)...Gap, [4)...Fixed frame, (5) +6
)... Bearing box, (7)... Screw shaft, (8)... 8-movement 7L'-m, (9)... Sliding shaft, αI-・sha7), (IIJ・-
Sliding bushing, @...screw jack, σ3.../yaft, (1→...motor for changing slab width, α9...bushing, aQ...screw jack, a7)φφ shaft, 0 stage...
e-spline, α1...shaft, kiln...motor for changing slab thickness, Qυ(c)...side dam, (2)@...support bar, ■...holt stop, ni)...button, slope...
・Spring, (to) ・Groove, ridge ・Press ring, (x
l... Axial direction, (Y)... Horizontal direction perpendicular to the axial direction,
(a) (b) Roll, (C) Side dam, (d
l...Slab, (el...Flange, (f)...Gap, (
Δh)...Difference in hot water level, (t+)(t2)...
Slab thickness.

Claims (3)

[Claims] (1) A pair of rolls are arranged horizontally in parallel to serve as casting rolls, and the upper part of the gap between the two rolls is used as a casting space to hold the molten metal to be cast, and the slab that has started to solidify is rolled. Regarding a twin-roll mold that is pulled out below the gap so that both rolls rotate synchronously, one roll is supported at a fixed position on a fixed frame, and the other roll is supported in the axial direction and perpendicular to the axial direction by a moving frame. A twin-roll continuous casting machine characterized in that it is movable in the horizontal direction and that both side dams at the end are movable relative to each other independently of the rolls. (2) The twin-roll continuous casting machine according to claim 1, wherein the side dam is made independent of the horizontal movement of the movable roll and is held so as to move together with the axial movement thereof. (3) The twin-roll continuous casting machine according to claim 1, wherein the side dam is held independent of the fixed roll so as to follow the horizontal movement of the movable roll.