JP2002219557A - Twin drum type continuously casting drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casting drum composed of a Cu-alloy made sleeve and an SUS-made core light in weight, free from the sliding of a fitting part in thermal loading, and long in durable life, in a twin drum type continuous casting drum used for twin drum type continuous casting equipment. SOLUTION: By constituting the SUS made core, which is fitted into a Cu- alloy made sleeve, of ring-shaped cores juxtaposed in the axial direction with a space with one another as a plurality of splitted bodies, the sleeve is movable in the axial direction at the part where the core does not exist, and the relative sliding on the fitting part becomes hard to be caused at the part where the core exists owing to that the length in the axial direction of the fitting part of the sleeve and the core is cut to be short, as a result, enabling the tightening force to be small in fitting of the sleeve and the core, which enables the sleeve to be formed thin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field 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]

2. Description of the Related Art An outline of a twin-drum type continuous casting drum used in a conventional twin-drum type continuous casting facility is described below.
A description will be given based on FIG. FIG. 3 is a vertical sectional side view of a conventional twin-drum continuous casting drum.

As shown in FIG. 3, a conventional casting drum in a twin-drum continuous casting facility has a
A SUS core 52, which is integrally formed in the axial direction, is fitted to the inner surface of the alloy sleeve 51 by shrink fitting and Cu
It has a double structure of an alloy and SUS, and has a drum shaft 53 connected to both ends of a SUS core 52 with bolts 54.

[0004] Here, shrink fit and tightening are used to obtain C
Slip resistance (surface pressure × friction coefficient) is applied between the u-alloy sleeve 51 and the SUS core 52,
If the thermal load generated during operation is equal to or higher than the slip resistance, there is a possibility that the Cu alloy sleeve 51 and the SUS core 52 may slip.

In order to prevent the occurrence of such a slip, if the shrink fit is increased in order to increase the slip resistance and the tightening force is increased in the tightening process, then the Cu alloy sleeve 51 is cut off. Since a danger arises, it is necessary to increase the thickness of the Cu alloy sleeve 51 so as to prevent the danger from occurring.

[0006] Usually, the temperature of molten steel handled by this type of continuous casting equipment is about 1350 to 1450 ° C.
As a result of taking into account the temperature of the molten steel, other operating conditions, and prevention of the occurrence of shredding, the Cu alloy sleeve 51
Had a thickness of 120 to 150 mm, generally about 140 mm, and a SUS core 52 was fitted therein.

The Cu alloy sleeve 51, SU
Each of the S-made core 52 and the drum shaft 53 has a water-cooled structure including a cooling water passage, but illustration and detailed description are omitted here.

[0008]

As described above, since the Cu alloy sleeve constituting the conventional twin-drum type continuous casting drum has a thick plate structure, the manufacturing process of the Cu alloy sleeve is carried out. It is difficult to forge in steel, causing large variation in quality. As a result, C due to heat load during casting operation
There is a problem that the surface layer of the u-alloy sleeve is damaged quickly and the life of the Cu alloy sleeve is short.

The present invention solves the problems of the conventional twin-drum type continuous casting drum, and is a lightweight, non-slip fitting part under heat load, and has a long service life.
An object of the present invention is to provide a casting drum composed of a u-alloy sleeve and a SUS core.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems.
In a twin-drum continuous casting drum in which a SUS core is fitted into a u-alloy sleeve to form a body,
The US-made core provides a twin-drum 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.

In other words, according to the first means, the SUS core fitted in the Cu alloy sleeve is constituted by a plurality of divided bodies, which are ring-shaped cores arranged at intervals in the axial direction. Therefore, in the Cu alloy sleeve, a portion where the SUS core that is fitted and supported by the Cu alloy sleeve and a portion where the SUS core does not exist are alternately formed, and the Cu alloy sleeve is a portion where the SUS core does not exist. Can be freely changed in the axial direction, and in the existing portion, the axial length of the fitting portion between the Cu alloy sleeve and the SUS core is divided short, so that relative slipping occurs in the fitting portion. As a result, the Cu alloy sleeve and the SU
This makes it possible to reduce the tightening force at the time of fitting the S core, so that the Cu alloy sleeve can be formed thin.

Further, the present invention provides, as a second means, in the first means, wherein the Cu alloy sleeve is 60 to
An object of the present invention is to provide a twin-drum continuous casting drum composed of a 100 mm thin plate.

In other words, 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 formed of a thin plate of 60 to 100 mm. Therefore, the thickness of the Cu alloy sleeve is greatly reduced as compared with the conventional Cu alloy sleeve having a thickness of 120 to 150 mm, so that the Cu alloy sleeve is reduced in weight and has a longer service life. Things.

Further, the present invention provides, as a third means, in the first or second means, wherein, among the plurality of divided SUS cores, cores at both ends are provided with a drum shaft at an axial end face. The peripheral surface to be fixed and fitted to the Cu alloy sleeve is formed wider than the peripheral surface of the intermediate core, and the intermediate core is formed on the peripheral surface with a convex small-width portion fitted to the Cu alloy sleeve. The present invention provides a twin-drum continuous casting drum provided with:

That is, according to the third means, among the plurality of ring-shaped SUS cores arranged at intervals in the axial direction inside the Cu alloy sleeve, the cores at both ends are the same as those described above. The peripheral surface fitted to the Cu alloy sleeve is formed wider than the peripheral surface of the intermediate core, and the intermediate core is provided with a convex small width portion fitted to the Cu alloy sleeve on the peripheral surface. Because of the configuration, the cores at both ends can cope with a larger load, and the core at the intermediate portion increases the ratio of the free portion to the elongation of the Cu alloy sleeve, and the slip prevention effect on the mating surface is further enhanced. Thus, it is possible to sufficiently cope with a casting drum having a long body and a large weight.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a vertical sectional side view of a twin-drum continuous casting drum according to the present embodiment.

That is, in the present embodiment, reference numeral 10 denotes a casting drum. The casting drum 10 is separated from the Cu alloy sleeve 11 by being spaced apart from each other in the axial direction inside the Cu alloy sleeve 11. And a plurality of ring-shaped SUS cores 12 fitted to the inner surface of the Cu alloy sleeve 11 by shrink fitting. Among them, the SUS cores 13 disposed at both ends are provided with an axial direction. Bolt 15 on end face
And the drum shaft 14 is connected.

Here, the ring-shaped SUS cores 12 and 13 are used.
The temperature of the molten steel handled by the twin-drum continuous casting equipment is 1350-14.
The thickness is about 80 mm in consideration of the fact that the temperature is about 50 ° C., etc., and the thickness can be selected from a width of 60 to 100 mm.

A ring-shaped SU divided into a plurality of pieces
An appropriate number of S cores 12 are selected according to the drum body length of the casting drum 10 to be manufactured. However, the axial direction of the space where the SUS core 12 does not fit with the Cu alloy sleeve 11 is selected. The length is configured to be larger than the length of the width of each ring-shaped core 12 fitted to the inner surface of the Cu alloy sleeve 11.

In the casting drum 10 of the present embodiment configured as described above, C
When the u-alloy sleeve 11 extends in the axial direction, the interval between adjacent SUS cores 12 formed in a ring shape fluctuates freely, so that the Cu alloy sleeve 11 slides with respect to each SUS core 12. Is eliminated.

In the portion where the inner surface of the Cu alloy sleeve 11 and the peripheral surface of the ring-shaped SUS core 12 are fitted, the width (length in the axial direction) of the fitting portion is short. The relative sliding of the Cu alloy sleeve 11 within the joint width does not occur.

Therefore, there is concern about relative slip between the Cu alloy sleeve 11 and the SUS core 12 in the fitting portion,
There is no need to apply a strong clamping force here, and there is no need to increase the thickness of the Cu alloy sleeve 11 because of concern about breakage due to the clamping force, and the Cu alloy sleeve 11 can be thinned.

According to the knowledge obtained by the inventors as a result of trial and error, this Cu alloy sleeve 11 has a temperature of 1350 to 1450 ° C. of the molten steel handled in the twin-drum continuous casting facility related to the present embodiment. The thickness is 6 in relation to the temperature of the molten steel and other operating conditions.
The range of 0 to 100 mm is effective, and it is particularly preferable that the thickness be about 80 mm.

As described above, the Cu alloy sleeve 11 according to the present embodiment is about half as thick as the conventional apparatus described above in which the thickness is 120 to 150 mm, generally about 140 mm. The plate thickness can be reduced, the forging is significantly improved in the manufacturing process of the Cu alloy sleeve 11, and the Cu alloy sleeve 11 with stable quality can be obtained, which can be used longer than before.

Further, since the Cu alloy sleeve 11 has a small thickness, the fitting operation is facilitated, for example, the material cost of the Cu alloy is low and the working time is shortened in the fitting step.

Thus, according to the present embodiment, a thin and lightweight casting drum 10 having a long durability (life) and no slippage at the fitting surface can be provided at a low cost, and the production of the drum type continuous casting can be achieved. The effect of enhancing the properties is obtained.

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described based on. 2A and 2B show a casting drum according to the present embodiment, wherein FIG. 2A is a longitudinal side view thereof, and FIG. 2B is an enlarged view of a portion A of FIG.

In order to avoid redundant description, portions having the same configuration as in the first embodiment are denoted by the same reference numerals in the drawings, and redundant description will be omitted as much as possible. The points specific to the present embodiment will be mainly described.

That is, the present embodiment is preferable for a casting drum having a long body and a large weight, and the ring-shaped SUS core 12 divided into a plurality of parts and axially spaced apart from each other. The SUS cores 13 arranged at both ends to connect the drum shaft 14 are slightly thicker than the other SUS cores 12 arranged in the middle part, and fit on the inner surface of the end of the Cu alloy sleeve 11. It is formed in a ring shape having a slightly wider peripheral surface 13a, while the other ring-shaped SUS core 12 arranged in the middle portion has a peripheral surface 1a.
A small convex portion 18 is provided in 2a, and is formed of a ring-shaped core that fits with the Cu alloy sleeve 11 at positions spaced apart from each other in the axial direction by the small convex portion 18.

In the case of a casting drum having a long body and a large weight, that is, a casting drum having a large body and a large weight, SU is disposed at both ends connecting the drum shaft 14 and divided into a ring shape.
A larger load is applied to the S core 13.

For this reason, in the present embodiment, the peripheral surface 13a of the SUS core 13 arranged at both ends and divided into a ring shape is connected to the other SUS core 1 arranged at the intermediate portion.
2 is slightly thicker and wider than the peripheral surface 12a, and the peripheral surface 13a is fitted with the Cu alloy sleeve 11 to bear the required strength.

As described above, the SUS core 12 divided in the axial direction at the intermediate portion is provided with a convex small width portion 18 on the peripheral surface 12a, and the convex small width portion 18 is provided with a Cu alloy sleeve. 11, the Cu alloy sleeve 1
1, the ratio of the free portion to the elongation is increased, the effect of preventing slippage on the fitting surface becomes higher and more reliable, and the safety of the casting drum having a trunk length can be improved.

While the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to such an embodiment.
It goes without saying that various changes may be made to the specific structure within the scope of the present invention.

[0034]

As described above, according to the invention as set forth in claim 1 of the present application, in a twin-drum continuous casting drum in which a SUS core is fitted into a Cu alloy sleeve to form a body, The SUS core constitutes a twin-drum 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. The portion where the SUS core to be fitted and supported is present and the portion where the SUS core does not exist are formed alternately, and the Cu alloy sleeve can freely move in the axial direction in the portion where the SUS core does not exist. In the existing portion, the axial length of the fitting portion between 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 Cu alloy sleeve and the SUS core The tightening force at the time of fitting can be reduced, and the Cu alloy sleeve can be formed thin, so that a suitable twin-drum continuous casting drum having a light weight and a long service life can be obtained. Things.

According to a second aspect of the present invention, in the first aspect of the present invention, the Cu alloy sleeve is a twin-drum type continuous casting drum formed of a thin plate of 60 to 100 mm. Because of the structure, the thickness of the Cu alloy sleeve is significantly reduced as compared with the conventional Cu alloy sleeve having a thickness of 120 to 150 mm, so that the Cu alloy sleeve is reduced in weight and has a longer service life. Thus, a suitable twin-drum continuous casting drum could be obtained.

According to a third aspect of the present invention, in the first or second aspect of the present invention, among the plurality of divided SUS cores, cores at both ends are axial end faces. And a peripheral surface fitted to the Cu alloy sleeve is formed wider than the peripheral surface of the intermediate core, and the intermediate core is fitted to the Cu alloy sleeve on the peripheral surface. Since the twin drum type continuous casting drum provided with the convex narrow portion is configured, the cores at both ends can cope with a larger load, and the core at the middle portion is a ratio of a free portion to the elongation of the Cu alloy sleeve. The preferred twin drum has a long service life and can sufficiently cope with a casting drum having a long body and a large weight by increasing the anti-slipping effect on the mating surface by increasing Drum for continuous casting It is intended.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a twin-drum 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.
FIG. 4 is an enlarged view of a portion A in FIG.

FIG. 3 is a vertical sectional 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 narrow part 51 Cu alloy sleeve 52 SUS core 53 Drum shaft 54 Bolt

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Mamoru Yamada 3434 Shimada, Hikari-shi, Yamaguchi Prefecture Nippon Steel Corporation Hikari Works (72) Inventor Tsuyoshi Tanaga 3434 Shimada, Hikari-shi, Hikari-shi, Yamaguchi New Inside Nippon Steel Corporation Hikari Works (72) Inventor Hiroshi Izaki 3434 Shimada, Hikari-shi, Yamaguchi Prefecture New Nippon Steel Corporation Hikari Works (72) Inventor Tadahiro Izu 3434 Shimada, Hikari-shi, Hikari-shi Yamaguchi Prefecture New Nippon Steel Corporation Hikari Works (72) Inventor Keiji Tsuneari 20-1 Shintomi, Futtsu-shi, Chiba Prefecture Nippon Steel Corporation Technology Development Division (72) Inventor Kazuto Yamamura 20-Shintomi, Futtsu-shi, Chiba Prefecture 1 Nippon Steel Corporation Technology Development Division (72) Katsuyoshi Miyake 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Yokoo Kazutoshi 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Pref., Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd. 4E004 DA13 QA01 QA03

Claims (3)

[Claims] 1. A twin-drum continuous casting drum in which a body is formed by fitting a SUS core into a Cu alloy sleeve, wherein the SUS core is divided into a plurality of parts and spaced in the axial direction. A twin-drum continuous casting drum, comprising a ring-shaped core arranged side by side. 2. The method according to claim 1, wherein the Cu alloy sleeve has a thickness of 60 to 10.
2. The twin-drum continuous casting drum according to claim 1, wherein the drum is formed of a 0 mm thin plate. 3. Among the plurality of divided SUS cores, cores at both ends fix a drum shaft to an axial end surface, and a peripheral surface fitted to the Cu alloy sleeve corresponds to an intermediate core. The twin-drum type continuous according to claim 1, wherein the core is formed wider than the peripheral surface, and the core in the intermediate portion is provided with a small convex portion on the peripheral surface to be fitted to the Cu alloy sleeve. Drum for casting.