JPH0215304B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dummy bar for continuous casting equipment that can be used for casting slabs with different cross-sectional shapes, such as round and rectangular shapes.

[Prior art and its problems] As is well known, a dummy bar in continuous casting equipment consists of a flexible chain link with a dummy bar head attached to the tip, and casting is performed while being guided by the dummy bar. The pieces are drawn and cast. Therefore, it is necessary to smoothly pass both the dummy bar and the slab following it through the same roller apron (guide roll) and pinch roll.

By the way, in conventional bending type continuous casting equipment equipped with a common pass line that can draw round slabs and rectangular slabs, flat rolls are used as pinch rolls, so it is difficult to pull rectangular slabs. However, if the round slab is held with the same pinch roll, pulled out or straightened, the round slab will be pressed more than necessary, so flat parts will be created at the top and bottom of the pulled round slab. is formed, causing a major problem in terms of the quality of the final product of the slab.

Therefore, as a result of trial and error in an attempt to solve this problem, it was devised to form a semicircular caliber in the axial direction of the pinch roll to prevent over-pressure of the round slab.

However, although it is sufficient to replace the entire dummy bar each time the shape of the slab is changed, when using a so-called common dummy bar in which most of the dummy bar is shared by one dummy bar, the dummy bar common body (rectangular slab) and A problem occurred in that the dummy bar could not run smoothly on the pass line because the pass line with the round slab was different and shifted.

[Means for Solving the Problems] Therefore, the present invention was created with a focus on solving such problems in continuous casting equipment for both round slabs and rectangular slabs. In a dummy bar for continuous equipment that can be used for slabs with multiple cross-sectional shapes by replacing the dummy bar head according to changes in the cross-sectional shape of A dummy bar head having a shape and a short dummy bar having a cross-sectional shape substantially corresponding to the cross-sectional shape of the slab interposed between the dummy bar common body and the dummy bar head, and the short dummy bars are fitted with concave and convex shapes in the front-rear direction. The recessed and recessed fitting portions are connected to each other by a link pin, and furthermore, the concave and convex portions of the recessed and recessed fitting portions are formed in an L-shape so as to face each other, and one side thereof is It is an object of the present invention to provide a dummy bar for continuous casting equipment, which is characterized in that it can be bent only in one direction by arranging the dummy bars so that they are substantially in contact with each other and have a gap on the other side.

[Example] Hereinafter, the configuration of the present invention will be explained in detail with reference to an example shown in the accompanying drawings.

Fig. 1 is an explanatory diagram of the pass line in the bending type continuous casting equipment of this embodiment, Fig. 2 is an enlarged view of the main part of Fig. 1, Fig. 3 is a sectional view from A to A of Fig. 2, and Fig. 4 is a plan view of the dummy bar in FIG. 2, FIG. 5 is a side view of FIG. 4, FIG. 6 is a view in the direction of the arrow B in FIG. 5, FIG. The figure shows a cross-sectional view of A to A when a rectangular slab is pulled out in Fig. 2.

First, the state in which the dummy bar of this embodiment is used will be explained.

That is, in FIG. 1, 1 is a mold in a bending continuous casting equipment for casting bloom, billet or slab slabs, 2, 2... are guide rolls forming guide roll zone G, and 3, 3... are pinch rolls. In the pinch roll that makes up zone P,
In the pinch roll zone P, the broken line indicating A in the figure indicates pass line A, and the solid line indicating B indicates pass line B. Pass line A is the line over which the round slab 4 (see Fig. 2) passes. The pass line B indicates the line over which the rectangular slab 5 (see FIG. 8) passes. Note that G' constitutes a single pass line.

The pinch roll 3 has an arcuate gulliver 3a formed at its axial center, and roll flat portions 3b on both sides (see FIGS. 3 and 8). In addition, the pass line A of the round slab 4
In the pinch roll zone P, its radius of curvature R2
This is a so-called multi-point bending path line in which the angle is changed midway.

For example, in the pinch roll zone P, if the pass line B of the rectangular slab 5 is configured by a simple one-point bending method, the pass line A of the round slab 4 is a pass line of a two-point bending method or more.

In this way, the pass lines of the round slab 4 and the rectangular slab 5 are made different, and a deviation S is generated there. The deviation S corresponds to the depth of the gulliver 3a.

Next, the dummy bars used for the pass lines A and B will be described.

The illustrations in Fig. 2 and Figs. 4 to 7 show what is used when casting the round slab 4, where 6 is a dummy bar head, and 7 is a short piece-shaped dummy bar exclusive body for the round slab. It can be used in common for each size of 4. However, for example, when casting a rectangular slab 5 such as a slab, the dummy bar is replaced with a dummy bar dedicated body having a rectangular cross section for the rectangular slab. 8 indicates a dummy bar union.

The cross-sectional shapes of these 6, 7, and 8 are formed as follows. That is, when casting a round slab 4, the dummy bar head 6 is round as shown in FIG. 6, the dummy bar exclusive body 7 is round or polygonal as shown in FIG. 7, and the dummy bar common body 8 is As shown in the second diagram, it is rectangular.

Since the dummy bar head 6 and the dummy bar dedicated body 7 are not pressurized by the pinch rolls 3, their contact is in a round or polygonal shape that is a point contact. The contact length between the pinch roll 3 and the dummy bar combination body 8 needs to be large in view of the strength of the contact pressure, so the shape is rectangular.

Of course, when casting a rectangular slab 5, the dummy bar head 6 and the dummy bar body 7 both have a rectangular cross section.

In addition, in FIGS. 4 and 5, between the dedicated body links 7a, 7b, and 7c of the dummy bar head 6 and the dummy bar dedicated body 7, the dummy bar does not bend downward in FIG. 5, but does curve upward. It has a structure that can be bent in only one direction. To explain this in detail, as shown in the figure,
The dedicated links 7a, 7b, 7c are fitted in a concave-convex manner with respect to each other in the front-rear direction, and are connected by inserting link pins 9, 9, . . . into the concave-convex fitting portions from the lateral direction. In the concave-convex fitting part, the concave-convex fitting part 10 and the convex part 11 have contact end surfaces formed in an L-shape, and the stepped part 12
engaged in.

With respect to the stepped portion 12, the respective abutting end surfaces are brought close to each other below the recessed portion 10 and the convex portion 11, and a distance 1 is provided between the abutting end surfaces above the stepped portion 12.

Therefore, the dedicated body links 7a, 7b, 7c can be bent upward by the distance l. Note that the distance m is provided to provide flexibility to the dummy bar.
Further, there is a play between the exclusive body link 7c of the dummy bar exclusive body 7 and the dummy bar common body 8 to the extent that it can absorb the amount of deviation S between the pass lines A and B, for example, as shown in the figure. Link pin 8a
It has a structure that allows it to rotate freely around the . In addition, between each link of the dummy bar union 8, as before,
It has a structure that can be bent only in one direction.

This embodiment is constructed as described above and has the following effects.

When casting the rectangular slab 5, the pass line B in the pinch roll zone P is the roll flat portion 3b of the pinch roll 3, as before.

When casting the round slab 4, the dummy bar combination body 8 is located on the pass line B in the pinch roll zone P, and travels while being held between the roll flat portions 3b of the pinch rolls 3. Next, the dummy bar head 6 for the round slab, like the round slab 4, runs on the pass line A along the gulliver 3a. There is a deviation S between these pass lines A and B, and this deviation S is absorbed by the dummy bar body 7. In other words, the difference in running height between the round slab 4 and the dummy bar common body 8 is absorbed by the relative rotation of the dummy bar body 7.

In summary, since the present invention adopts the configuration described in the claims, the following effects are achieved.

[Effect of the invention] Slabs with different cross-sectional shapes can be cast as they are in the same continuous casting equipment, and the pass line is simply changed, so the slabs with the desired shape are not subjected to unnecessary pressure. Because there is no metal, it can be cast without sacrificing quality.

Moreover, since the pinch rolls and most of the dummy bars can be shared, equipment costs can be reduced. Since this can be absorbed by the relative rotation of the dummy bar, any shape of the dummy bar for slabs can be smoothly pulled out.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the pass line in the bending continuous casting equipment according to the embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is a cross-sectional view of Fig. 2, 4 is a plan view of the dummy bar in FIG. 2, FIG. 5 is a side view of the dummy bar in FIG.
The figure shows a cross-sectional view from A to H in FIG. 5, and FIG. 8 shows a cross-sectional view from A to A in FIG. 3... Pinch roll, 4... Round slab, 5... Rectangular slab, 6... Dummy bar head, 7... Dummy bar exclusive body, 8... Dummy bar combination body, A, B...
...pass line, A, B...pass line, P...pinch roll zone, S...misalignment.

Claims (1)

[Claims] 1. In a dummy bar for continuous equipment that can be used for slabs with multiple cross-sectional shapes by replacing the dummy bar head according to changes in the cross-sectional shape of the slab to be cast, the dummy bar is used as a dummy bar common body and The dummy bar head has a cross-sectional shape corresponding to the cross-sectional shape, and the short-piece dummy bar has a cross-sectional shape substantially corresponding to the cross-sectional shape of the slab interposed between the dummy bar combination and the dummy bar head. The recesses and recesses are fitted in the front-rear direction, and the recess and recess fitting parts are connected to each other by link pins, and the concave and recessed parts of the recess and protrusion fitting parts are formed in an L-shape so as to face each other, and 1. A dummy bar for continuous casting equipment, characterized in that one side of the dummy bar is arranged so as to substantially contact each other and the other side thereof is arranged with a gap between them, so that the dummy bar can be bent in only one direction.