JPH04344852A - Cooling roll for twin roll type continuous caster - Google Patents

Abstract

PURPOSE:To improve the quality of a cast product and the productivity by securing structural strength and having constitution to be thinned in a roll barrel part coming into contact with a molten metal and improving this cooling efficiency in uniform temp. distribution. CONSTITUTION:A supporting cylinder 2 fitting plural through-holes 2a as grid- state to the peripheral wall is inserted into the sleeve-state roll barrel part 1 and also tubular spray nozzle 6 arranging plural injecting holes 6a directing in a radius direction in an outer periphery is set at the center part of the supporting cylinder 2. Even if the roll barrel part is thinned, the structural strength withstanding to the static pressure of the molten metal and thermal stress can be secured by reinforcing with the supporting cylinder. Further, the roll barrel part is directly cooled with cooling water injected from the spray nozzle through the through-holes in the supporting cylinder and on the other hand, the supporting cylinder can be efficiently cooled in high heat-exchanging area and the whole roll barrel part can be uniformly cooled from the inner part in the high cooling efficiency.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a cooling roll for a twin-roll continuous casting machine, and more specifically, the cooling rolls form a casting part in pairs and cool and solidify the cast molten metal into a sheet shape. This relates to the cooling roll of a twin-roll continuous casting machine.

0002

[Prior Art] A twin-roll continuous casting machine used for continuous casting of ultra-thin metal sheet materials, etc. has a twin-roll type continuous casting machine that casts molten metal M in pairs, as shown in Fig. 3, which is a conceptual diagram. A pair of cooling rolls (31) and (31') are installed to form the part (32) and to cool and solidify the cast molten metal M in a sheet form and send it out. Further, these cooling rolls are usually formed into hollow rolls, and are configured to cool the roll body by introducing a refrigerant thereinto.

[0003] Conventionally, as shown in FIG. 4, which is a cross-sectional view showing the general configuration, a tubular spray nozzle (43) is installed in a hollow part (42) in a roll body (41) of a cooling roll. The most commonly used method has been to cool the roll body (41) from the inside by disposing cooling water through the spray nozzle (43).

By the way, in order to increase the cooling efficiency of these hollow cooling rolls, it is necessary to use a highly thermally conductive material such as copper material for the roll body, as well as increase the amount of cooling water and increase the cooling efficiency of the roll body. The solution was to make it thinner.

However, by increasing the amount of cooling water, there is a limit to the heat exchange efficiency for the roll body which has a certain inner surface area, and no effect beyond a certain level can be obtained.On the other hand, if the roll body is made thinner, the cooling Although the efficiency is increased, the structural strength of the cooling roll is reduced, and the static pressure and thermal stress of the molten metal applied during operation make it more likely to bend or flex, resulting in a deterioration in the quality of the cast product. cause problems.

[0006] On the other hand, as a cooling roll having a structure that can address the above-mentioned problems, there is, for example, one disclosed in Japanese Patent Laid-Open No. 59-50965. As shown in FIG. 5, which is a partially cutaway perspective view, this cooling roll has a sleeve-shaped roll body (51) with shafts (52a) at both ends.
A core shaft (52) having a diameter (52b) is fitted therein, and a spiral passageway (53) for passing a refrigerant is provided between the roll body (51) and the core shaft (52). . In this conventional cooling roll, cooling water is introduced from one end shaft (52b) side and discharged from the other end shaft (52b) side through a spiral water passage (53). ) and is backed up by the core shaft (52), so that even if the roll body (51) is made thinner, its structural strength can be ensured.

[0007]

[Problems to be Solved by the Invention] However, when the latter conventional cooling roll mentioned above (Japanese Patent Laid-Open No. 59-50965) is used in a twin-roll continuous casting machine, the following problems arise. found. In other words, in this conventional cooling roll, the cooling water introduced from one end flows spirally in the axial direction to cool the roll body, while at the same time increasing the temperature due to heat exchange with the roll body. Since it is discharged from the other end, a large temperature difference occurs between the inlet and outlet sides, and the roll body cooled by this cooling water has a certain temperature gradient in the axial direction, and as a result, the molten metal It becomes impossible to cool and solidify evenly.

The present invention has been made in view of the above-mentioned problems of the prior art, and is capable of ensuring structural strength to withstand the static pressure and thermal stress of molten metal, while improving its cooling efficiency by achieving uniform temperature distribution. The object of the present invention is to provide a cooling roll for a twin-roll continuous casting machine that can improve the quality and productivity of cast products.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration. That is, the cooling roll of the twin-roll continuous casting machine according to the present invention includes a sleeve-shaped roll body, a support tube that is fitted inside the roll body, and has a peripheral wall with a large number of through holes arranged in a grid pattern in the radial direction. , an end shaft attached to both ends of the support tube, and an end shaft located inside the support tube passing through the center of at least one of the end shafts in the axial direction, and extending along the outer periphery. A tubular spray nozzle provided with a plurality of injection holes oriented in the radial direction.

0010

[Operation] In the present invention, the sleeve-shaped roll body is backed up by a support tube fitted into the roll body, so even if the roll body is thin, it can withstand the static pressure and thermal stress of molten metal. Structural strength can be ensured. On the other hand, a large number of through holes are provided in the peripheral wall of the support tube in a grid pattern in the radial direction, and a tubular spray nozzle is located inside the support tube and has a plurality of injection holes oriented in the radial direction on the outer periphery. The roll body and support tube can be cooled from inside by spraying cooling water in the radial direction through the spray nozzle. In addition, the cooling water injected from the spray nozzle directly collides with the inner surface of the roll body through the through holes in the support cylinder, cooling the roll body directly, while the surface area is expanded by providing a large number of through holes. The roll body is cooled evenly with high cooling efficiency through direct cooling and indirect cooling via the support tube. be able to.

[0011]

[Embodiments] Hereinafter, embodiments of the cooling roll according to the present invention will be explained with reference to the drawings. [FIG. 1] is a cross-sectional view of a cooling roll according to an embodiment of the present invention, in which (a) is a front cross-sectional view, and (b) is a cross-sectional view taken along line AA in (a).

[0012] In Fig. 1, (1) is a roll body, and this roll body (1) is a cylindrical body made of a copper material with high thermal conductivity, and is formed into a relatively thin sleeve shape. There is.

(2) is a support cylinder, and this support cylinder (
2) is formed into a relatively thick cylindrical body made of structural alloy steel, and has a large number of through holes (2a) in the radial direction in the peripheral wall, and the roll body (1) has a relatively thick cylindrical body. It is fitted throughout the entire length. Also, this support tube (2)
The through hole (2a) is oriented in the axial direction as shown in (a) of Fig. 2, which is an explanatory view of a part of the support cylinder (2) developed from the outer circumference. The openings are arranged at equal pitches in the form of a square grid tilted at 45 degrees. In this example, the through hole (2a) of the support tube (2) was provided so that the opening area of the outer circumference thereof accounted for about 50% of the total outer circumference area of the support tube (2).

(3) and (4) are end shafts, and these end shafts (3) and (4) are removably attached to both ends of the support tube (2). Also, this end shaft (3) (4)
A bearing (8) is attached to the holder. Moreover, one end shaft (3) is formed into a hollow shaft, and the other end shaft (4)
is formed on a solid shaft for connection to drive means.

Reference numeral (5) denotes a shaft end socket, and the base end of the shaft end socket (5) is rotatably and watertightly fitted into the hollow portion of the end shaft (3). Further, a water supply hole (5a) and a drainage hole (5b) are provided in the shaft end socket (5) to communicate the inside of the support tube (2) with the outside.

[0016] (6) is a spray nozzle, and this spray nozzle (6) is a tubular body in which a plurality of injection holes (6a) oriented in the radial direction are provided on the outer periphery in a staggered manner at a predetermined pitch in the axial direction. , its base end is fixed and supported by the inner end of the shaft end socket (5), and its inlet center hole communicates with the water supply hole (5a) of the shaft end socket (5), and the injection hole (6a) ) is disposed at the axial center of the support tube (2), extending over the entire length inside the support tube (2).

(7) is a drainage nozzle, and this drainage nozzle (7) has its base end connected to the shaft end socket (5).
The spray nozzle (6) is fixed and supported by the lower inner end of the shaft end socket (5).
It communicates with the drain hole (5b) of the support cylinder (2), and is arranged with its tip facing the inner lower part of the support cylinder (2).

[0018] In the cooling rolls of this embodiment having the above-mentioned configuration, when the cooling rolls are installed in pairs in a continuous casting machine for continuous casting, the cooling water introduced through the water supply hole (5a) of the shaft end socket (5) is used. The roll body (1) and the support tube (2) can be cooled from the inside by spraying in the radial direction from the injection hole (6a) of the spray nozzle (6). Here, the cooling water injected from the spray nozzle (6) directly collides with the roll body (1) through the through hole (2a) that occupies about 50% of the support tube (2), and then directly collides with the roll body (1).
) while cooling directly, numerous through holes (2a)
The roll body (1) collides with the support tube (2) whose surface area has been enlarged by providing a large heat exchange area, and efficiently cools the support tube (2) with a large heat exchange area. Indirect cooling via the support tube (2) allows uniform cooling with high cooling efficiency.

[0019] The roll body (1) also has a support cylinder (2).
), so even if it is relatively thin, it can maintain structural strength to withstand the static pressure and thermal stress of molten metal during continuous casting. By providing a thin wall, the cooling efficiency can be further improved.

On the other hand, the cooling water injected from the spray nozzle (6) and heat exchanged with the roll body (1) and the support cylinder (2) is caused by the rotation of the cooling roll to flow into the support cylinder (2) located at the upper part. The water flows down without stopping into the through hole (2a) of the support cylinder (2), and flows out to the outside through a drainage nozzle (7) disposed with its tip facing the inner lower part of the support tube (2).

Note that in this embodiment, one end shaft (3)
A hollow shaft is used, and a spray nozzle (
6) and a shaft end socket (5) that supports the drain nozzle (7), but this is just an example, and the end shafts (3) and (4) on both sides are hollow shafts, and shaft end sockets are provided on both sides. (5) may be provided, and thereby drainage nozzles (7) may be provided on both sides.

Further, in this embodiment, the through holes (2a) of the support tube (2) are formed in a rectangular lattice shape inclined at 45 degrees with respect to the axial direction, as shown in FIG. 2(a). However, the present invention is not limited to this, and for example, the openings shown in FIG. 2 showing another embodiment thereof are provided.
As shown in Figure b) and Figure (c), square through holes (2
A') may be provided in a staggered manner as a support tube (2'), or a support tube (2'') in which round through holes (2a'') are provided in a staggered manner. Furthermore, the shape is not only square or circular, but also semicircular,
One or more of these shapes may be arbitrarily selected from diamonds, rectangles, triangles, etc., and they may be arranged not only in a staggered manner but also in a vertically and horizontally aligned manner.

[0023]

Effects of the Invention As described above, the cooling roll of the twin-roll continuous casting machine according to the present invention has a support cylinder having a large number of through holes in the peripheral wall fitted therein, and the roll body in contact with the molten metal. Even if the roll body is made thinner, it can maintain the structural strength to withstand molten metal static pressure and thermal stress, and can be efficiently cooled directly and indirectly from the inside, thereby increasing its cooling efficiency. The quality and productivity of cast products can be significantly improved by increasing the temperature under uniform temperature distribution.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a cooling roll according to an embodiment of the present invention, in which (a) is a front cross-sectional view, and (b) is a cross-sectional view taken along line AA in (a).

FIG. 2 is an explanatory view of a part of the support tube in FIG. 1, unfolded from the outer peripheral side.

FIG. 3 is a conceptual explanatory diagram of cooling rolls of a twin-roll continuous casting machine.

FIG. 4 is a sectional view showing a schematic configuration of cooling rolls of a conventional twin-roll continuous casting machine.

FIG. 5 is a partially cutaway perspective view of a conventional cooling roll.

[Explanation of symbols]

(1) ---Roll body (2) ---Support tube (2a)--Through hole (3) -- End shaft (4) -- End shaft (5) ---Shaft end socket (5a)--Water supply hole (5b)--Drainage hole (6) --Spray nozzle (6a)--Injection hole (7) --Drainage nozzle (8) --Bearing

Claims (1)

[Claims] [Claim 1] A sleeve-shaped roll body, a support tube fitted into the roll body and having a peripheral wall provided with a large number of through holes in a grid pattern in the radial direction, and a support tube attached to both ends of the support tube. an end shaft, and a plurality of injection holes oriented in the radial direction on the outer periphery of the end shaft, the end shaft being located within the support cylinder and passing through the center of at least one of the end shafts in the axial direction. A cooling roll for a twin-roll continuous casting machine, characterized in that it is equipped with a tubular spray nozzle.