JP4441130B2 - Twin drum type drum for continuous casting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a twin drum type continuous casting drum used in a twin drum type continuous casting facility.
[0002]
[Prior art]
An outline of a twin drum type continuous casting drum used in a conventional twin drum type continuous casting facility will be described with reference to FIG.
FIG. 3 is a longitudinal sectional side view of a conventional twin drum type continuous casting drum.
[0003]
As shown in FIG. 3, a casting drum in a conventional twin-drum type continuous casting facility is obtained by baking a SUS core 52 that is integral with an inner surface of a Cu alloy sleeve 51 that forms an outer surface. The SUS core 52 is coupled to the drum shaft 53 with bolts 54 at both ends of the SUS core 52.
[0004]
Here, slip resistance (surface pressure × friction coefficient) is applied between the Cu alloy sleeve 51 and the SUS core 52 by shrink fitting and tightening, but the thermal load generated during operation is reduced. If the slip resistance is exceeded, the Cu alloy sleeve 51 and the SUS core 52 may slip.
[0005]
In order to prevent the occurrence of such a slip, if the shrinkage force is increased to increase the slip resistance force, and the tightening force is increased during the tightening process, there is a risk that the Cu alloy sleeve 51 may be broken. Therefore, it is necessary to increase the thickness of the Cu alloy sleeve 51 so as to prevent the occurrence of this danger.
[0006]
Normally, the temperature of the molten steel handled by this kind of continuous casting equipment is about 1350 to 1450 ° C. As a result of considering the temperature of the molten steel, other operating conditions, and the prevention of the occurrence of cutting of the steel, The sleeve 51 has a thickness of 120 to 150 mm, generally about 140 mm, and a SUS core 52 is fitted therein.
[0007]
Each of the Cu alloy sleeve 51, the SUS core 52, and the drum shaft 53 has a water-cooled structure in which a cooling water flow passage is incorporated, but the illustration and detailed description thereof are omitted here. .
[0008]
[Problems to be solved by the invention]
As described above, since the Cu alloy sleeve constituting the conventional twin-drum type continuous drum is thick, it is difficult to forge in the manufacturing process of the Cu alloy sleeve and the quality is improved. As a result, there was a problem in that the surface layer of the Cu alloy sleeve was damaged quickly due to the heat load during the casting operation, and the life of the Cu alloy sleeve was short.
[0009]
The present invention eliminates such problems in the conventional twin-drum type continuous casting drum, is light in weight, does not slip in the fitting portion under heat load, and has a long service life and a SUS sleeve made of SUS An object of the present invention is to provide a casting drum composed of a core.
[0010]
[Means for Solving the Problems]
The present invention has been made to solve the above-mentioned problems. As a first means, a twin drum type continuous casting drum in which a SUS core is fitted into a Cu alloy sleeve to form a body portion. The SUS core provides a twin-drum type continuous casting drum composed of a ring-shaped core that is divided into a plurality of pieces and is arranged at intervals in the axial direction.
[0011]
In other words, according to the first means, the SUS core fitted in the Cu alloy sleeve is composed of ring-shaped cores arranged at intervals in the axial direction as a plurality of divided bodies. Therefore, in the Cu alloy sleeve, a portion where the SUS core to be fitted and supported is formed and a portion where the SUS core does not exist are alternately formed, and the Cu alloy sleeve is axially formed in the portion where the SUS core does not exist. In addition, in the existing portion, the axial length of the fitting portion of the Cu alloy sleeve and the SUS core is divided short, so that relative slip does not occur in the fitting portion, As a result, the tightening force can be reduced when the Cu alloy sleeve and the SUS core are fitted, and the Cu alloy sleeve can be formed thin.
[0012]
Further, the present invention provides, as a second means, a twin-drum continuous casting drum in which, in the first means, the Cu alloy sleeve is formed of a thin plate of 60 to 100 mm.
[0013]
That is, according to the second means, the Cu alloy sleeve in which a plurality of ring-shaped cores arranged at intervals in the axial direction are fitted is constituted by a thin plate of 60 to 100 mm. Compared to the conventional 120-150 mm thick sleeve made of this kind of Cu alloy, its thickness is greatly reduced to reduce the weight of the Cu alloy sleeve and to prolong its useful life. .
[0014]
Furthermore, the present invention provides a third means in which, in the first or second means, the cores at both ends of the SUS core divided into a plurality of parts fix the drum shaft to the axial end face. The peripheral surface that fits into the Cu alloy sleeve is formed wider than the peripheral surface of the intermediate core, and the intermediate core is provided with a convex narrow portion that fits into the Cu alloy sleeve on the peripheral surface. The present invention provides a twin drum type drum for continuous casting.
[0015]
That is, according to the third means, the cores at both ends of the plurality of ring-shaped SUS cores arranged side by side in the axial direction inside the Cu alloy sleeve are made of the Cu alloy. The peripheral surface that fits into the sleeve is formed wider than the peripheral surface of the intermediate core, and the intermediate core is formed by providing a convex small width part that fits into the Cu alloy sleeve on the peripheral surface. Therefore, the cores at both ends can handle a larger load, and the intermediate core increases the ratio of the free part with respect to the elongation of the Cu alloy sleeve, and the slip prevention effect on the mating surface is further enhanced. It is possible to sufficiently cope with a casting drum having a long part and a large weight.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a longitudinal side view of a twin drum type continuous casting drum according to the present embodiment.
[0017]
That is, in the present embodiment, reference numeral 10 denotes a casting drum, and the casting drum 10 is divided into a Cu alloy sleeve 11 and an inner space of the Cu alloy sleeve 11 spaced apart from each other in the axial direction. It has a plurality of ring-shaped SUS cores 12 that are shrink-fitted to the inner surface of a Cu alloy sleeve 11, and SUS cores 13 that are arranged at both ends have bolts on the axial end surfaces. The drum shaft 14 is coupled by 15.
[0018]
In consideration of the fact that the temperature of the molten steel handled by the twin drum type continuous casting equipment is about 1350 to 1450 ° C., the Cu alloy sleeve 11 fitted with the ring-shaped SUS cores 12 and 13 is, Although it is comprised by the thickness of about 80 mm, this plate | board thickness can choose the width | variety of 60-100 mm.
[0019]
An appropriate number of the ring-shaped SUS cores 12 divided into a plurality is selected according to the drum body length of the casting drum 10 to be manufactured, but the SUS core 12 is made of a Cu alloy. The length in the axial direction of the interval portion that is not fitted to the sleeve 11 is configured to be larger than the length of the width portion of each ring-shaped core 12 fitted to the inner surface of the sleeve 11 made of Cu alloy.
[0020]
In the casting drum 10 of the present embodiment configured as described above, when the Cu alloy sleeve 11 side extends in the axial direction due to a thermal load during casting operation, the ring-shaped SUS core 12 is adjacent. By allowing the mutual interval to freely change, the slip on the Cu alloy sleeve 11 side with respect to each SUS core 12 is eliminated.
[0021]
Further, in the portion where the inner surface of the Cu alloy sleeve 11 and the peripheral surface of the SUS core 12 configured in a ring shape are fitted, the width of the fitting portion (length in the axial direction) is short. The relative slip of the Cu alloy sleeve 11 does not occur inside.
[0022]
Therefore, there is no need to apply a strong tightening force here because of concern about the relative slip between the Cu alloy sleeve 11 and the SUS core 12 in the fitting portion, and there is a concern about damage due to this tightening force. There is no need to increase the thickness of the alloy sleeve 11, and the Cu alloy sleeve 11 can be made thinner.
[0023]
According to the knowledge obtained by the inventors as a result of trial and error, the temperature of the molten steel handled in the twin-drum continuous casting equipment to which the present embodiment relates is about 1350 to 1450 ° C. In this case, in relation to the temperature of the molten steel and other operating conditions, the thickness of the plate is effectively in the range of 60 to 100 mm, and it is particularly preferable that the thickness is about 80 mm.
[0024]
As described above, the Cu alloy sleeve 11 in the present embodiment has a plate thickness of about half that of the conventional apparatus described above, which is 120 to 150 mm, generally about 140 mm thick. In the manufacturing process of the Cu alloy sleeve 11, forging is remarkably improved, and the Cu alloy sleeve 11 having a stable quality can be obtained and can be used for a longer time than before.
[0025]
Further, since the Cu alloy sleeve 11 has a thin plate thickness, the material cost of the Cu alloy becomes low and the work time is shortened in the fitting process.
[0026]
Thus, according to the present embodiment, it is possible to provide the casting drum 10 that has a long durability (lifetime) and is thin and light in weight so that slippage does not occur on the fitting surface, and the productivity of the drum-type continuous casting is increased. An effect is obtained.
[0027]
Next, a second embodiment of the present invention will be described with reference to FIG.
2A and 2B show a casting drum according to the present embodiment, in which FIG. 2A is a longitudinal side view thereof, and FIG. 2B is an enlarged view of a portion A of FIG.
[0028]
In addition, in order not to make the description redundant, parts having the same configuration as those of the first embodiment described above are denoted by the same reference numerals in the drawing, and redundant description is omitted as much as possible. The point peculiar to a form is explained mainly.
[0029]
In other words, the present embodiment is preferable for a casting drum having a long body portion and a large weight. Among the ring-shaped SUS cores 12 divided into a plurality of pieces and spaced apart in the axial direction, a drum shaft is provided. The SUS cores 13 arranged at both ends to connect 14 are slightly thicker than the other SUS cores 12 arranged at the intermediate part and are slightly fitted to the inner surface of the end of the Cu alloy sleeve 11. Another ring-shaped SUS core 12 formed in a ring shape having a wide peripheral surface 13a, on the other hand, is provided with a convex small width portion 18 on the peripheral surface 12a, and this convex small width portion. 18, a ring-shaped core that is fitted to the Cu alloy sleeve 11 at positions spaced apart from each other in the axial direction.
[0030]
In a casting drum having a long trunk portion and a large weight, that is, a casting drum having a trunk length and a large weight, a larger load is placed on the SUS core 13 arranged at both ends connecting the drum shaft 14 and divided into ring shapes. Take it.
[0031]
For this reason, in the present embodiment, the peripheral surface 13a of the SUS core 13 disposed at both ends and divided into a ring shape is slightly more than the peripheral surface 12a of the other SUS core 12 disposed in the intermediate portion. It is thick and wide and is fitted with the Cu alloy sleeve 11 at the peripheral surface 13a to bear the necessary strength.
[0032]
Further, as described above, the SUS core 12 arranged in the middle portion in the axial direction is provided with the convex small width portion 18 on the peripheral surface 12a, and is fitted to the Cu alloy sleeve 11 by the convex small width portion 18. By combining, the ratio of the free part with respect to the elongation of the Cu alloy sleeve 11 is increased, the anti-slip effect on the fitting surface becomes higher and more reliable, and the safety of the trunk-length casting drum is improved. It can be increased.
[0033]
Although the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to this embodiment, and it goes without saying that various modifications may be made to the specific structure within the scope of the present invention. Absent.
[0034]
【The invention's effect】
As described above, according to the invention described in claim 1 of the present application, in the twin-drum continuous casting drum in which a SUS core is fitted into a Cu alloy sleeve to form a body portion, the SUS core is Since the twin drum type continuous casting drum is composed of a ring-shaped core that is divided into a plurality of pieces and arranged at intervals in the axial direction, the inside of the Cu alloy sleeve is fitted and supported The portion where the SUS core is present and the portion where the SUS core is present are alternately formed, and the Cu alloy sleeve can freely vary in the axial direction in the portion where the SUS core does not exist. Since the axial length of the fitting portion between the Cu alloy sleeve and the SUS core is short, no relative slip occurs in the fitting portion. As a result, when the Cu alloy sleeve and the SUS core are fitted together, It is possible to obtain a suitable twin-drum type continuous casting drum that is light in weight and has a long service life by being able to reduce the fastening force and forming a thin Cu alloy sleeve. is there.
[0035]
According to a second aspect of the present invention, in the first aspect of the present invention, the Cu alloy sleeve comprises a twin drum continuous casting drum composed of a thin plate of 60 to 100 mm. Therefore, compared with the conventional thick sleeve of 120 mm to 150 mm of this kind of Cu alloy sleeve, the thickness is greatly reduced to reduce the weight of the Cu alloy sleeve, extend the service life, etc. A suitable twin-drum type continuous casting drum could be obtained.
[0036]
Furthermore, according to the invention described in claim 3, in the invention described in claim 1 or 2, the cores at both ends of the SUS core divided into a plurality are arranged on the drum shaft on the end surface in the axial direction. The peripheral surface that fits the Cu alloy sleeve is formed wider than the circumferential surface of the intermediate core, and the intermediate core is a convex small width that fits the Cu alloy sleeve on the circumferential surface. Since the twin drum type continuous casting drum is provided with a part, the cores at both ends can handle a larger load, and the ratio of the free part of the intermediate part core to the elongation of the Cu alloy sleeve increases. In addition, the anti-slip effect on the mating surface is further enhanced, so that it is possible to sufficiently cope with a casting drum with a long trunk and a large weight, and a suitable twin-drum type continuous casting having a long service life. I was able to get a drum
[Brief description of the drawings]
FIG. 1 is a vertical side view of a twin drum type continuous casting drum according to a first embodiment of the present invention.
FIGS. 2A and 2B show a twin-drum continuous casting drum according to a second embodiment of the present invention, in which FIG. 2A is a longitudinal side view thereof, and FIG. 2B is an enlarged view of a portion A of FIG.
FIG. 3 is a longitudinal side view of a conventional twin-drum continuous casting drum.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Casting drum 11 Cu alloy sleeve 12 SUS core 13 SUS core 14 Drum shaft 12a Peripheral surface 13a Peripheral surface 15 Bolt 18 Convex small width part 51 Cu alloy sleeve 52 SUS core 53 Drum shaft 54 Bolt

Claims (3)

In a twin drum type continuous casting drum in which a SUS core is fitted into a Cu alloy sleeve to form a body portion, the SUS core is divided into a plurality of rings and arranged in an axially spaced manner. The interval between the adjacent SUS cores can be freely changed in the axial direction as the Cu alloy sleeve is extended in the axial direction due to a thermal load during casting operation. Double drum continuous casting drum.   2. The twin-drum continuous casting drum according to claim 1, wherein the Cu alloy sleeve is formed of a thin plate of 60 to 100 mm.   Among the SUS cores divided into a plurality, the cores at both ends fix the drum shaft to the end surface in the axial direction and make the peripheral surface fitted to the Cu alloy sleeve wider than the peripheral surface of the core core. The twin-drum continuous casting drum according to claim 1 or 2, wherein the core of the intermediate portion is provided with a convex narrow portion that fits to the Cu alloy sleeve on the peripheral surface.

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