JPH09141396A - Cooling drum for continous casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welded structure capable of being exactly sealed of cooling liquid by providing a cooling liquid hole in the vicinity of the outer peripheral surface at the inner part of a cooling roll and providing a cooling liquid flowing control member in the inner part of the cooling liquid hole, a supporting member for fitting the member in liquid-tightness and a seal cover. SOLUTION: The cooling liquid hole is bored so as to penetrate the axial directional cooling liquid hole 10a in the axial direction in a sleeve 2b for cooling and bored so as to form the radial directional cooling liquid hole 10b in the radial direction to pass the cooling water through a cooling liquid duct. A control member 3 is set in the axial directional cooling liquid hole 10a and a hollow hole 3a is arranged in the axial direction. A packing 20 foe sealing is arranged in a supporting member 4 of the member 3 to support the member 3 and also, to prevent the cooling liquid from flowing into a space part 7. The end part of the axial directional cooling liquid hole 10a is provided with the seal cover 5 and firmly sealed with welding.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cooling drum for a continuous casting apparatus.

[0002]

2. Description of the Related Art A twin drum type continuous casting apparatus is shown in FIG.
An example of a conventional cooling drum used in the apparatus is shown in FIG.

In FIG. 3, reference numerals 1 and 1'indicate a pair of water-cooling cooling drums arranged with a predetermined gap, and a hollow shaft portion 102 thereof is supported by a bearing. Both cooling drums 1,
1'rotates in a mutually opposite direction as indicated by an arrow by a driving device (not shown), and supplies molten metal to a casting portion composed of a pair of side dams 105 and a pair of outer peripheral surfaces of the cooling drums 1 and 1 ', This is solidified and the thin plate 106 is continuously cast. At this time, the cooling liquid is supplied in order to prevent the temperature rise of the cooling drums 1, 1 '.

The cooling water follows the arrow, and the cooling liquid duct 50b.
Through the cooling liquid 1, 1 ′ into a large number of axial cooling liquid holes 10 a arranged along the outer peripheral surface, and through the cooling liquid duct 50 a in the cooling drum 1, 1 ′, the right side in the figure. It is discharged through the other hollow shaft portion.

In the cooling liquid hole 10a formed in the axial direction,
As shown in FIG. 4, a cooling liquid flow control member 3 (hereinafter referred to as a control member) is arranged to identify the flow rate / flow velocity of the cooling liquid,
The molten metal is cooled effectively.

The end of the cooling liquid hole 10a in the axial direction is welded and sealed by welding 6, but a through hole 4'a is formed in the supporting member 4'of the control member 3 for use. By providing the through hole 4'a, the cooling liquid directly flows into the seal lid 5, so that if the seal lid 5 is damaged, the effect of preventing the cooling liquid from flowing out is small. On the other hand, when the through hole 4'a is not formed in the support member 4 ', the space on the opposite side of the seal lid 5 to be welded is small, so that the gas in the space expands during welding and a back pressure is generated in the molten metal. Therefore, there are drawbacks such as insufficient throat thickness, blowholes, and welding defects such as pitting.

[0007]

The conventional cooling drum described above has the following problems. Since the space on the opposite side to be welded is narrow, the gas in the space expands during welding, creating a back pressure on the molten metal and inducing welding defects such as blowholes and pitting. When the through hole 4'a is formed in the support member 4'in order to prevent the above-mentioned problem, the cooling liquid directly flows into the space, and the load on the seal lid 5 increases. Further, when the seal lid 5 is damaged, the effect of preventing the cooling liquid from flowing out is small.

[0008]

In order to solve the above problems, the present invention adopts a welding structure for the seal at the end of the cooling liquid passage hole of the cooling drum and installs it in the cooling liquid passage.
The control member for reducing the cross section of the flow path is hollow, and the hollow hole is configured to penetrate from one end to the other end. Further, the cooling liquid is sealed at two stages, that is, the packing for sealing the support member and the welded portion of the seal lid.

[Operation] Since the control member is provided with the hollow hole, when the seal lid and the cooling sleeve are welded, the gas existing in the space is heated and expanded by the welding heat, but penetrates the control member. Since the hollow holes are provided, the gas is cooled at the place away from the weld and the temperature does not rise, the gas pressure in the space hardly rises, and the molten metal during welding is kept calm and good. Can be welded to. Further, when the present cooling drum is used, since the hollow hole of the control member does not communicate the space portion and the cooling liquid hole with the supporting member, the cooling liquid is sealed.
The seal packing and the seal lid welded to each other are carried out in two steps, which further improves the reliability of the seal.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

[Embodiment] A first embodiment of the present invention will be described with reference to FIG. The main body structure portion of this embodiment is of the same type as the conventional device shown in FIG. 3, and FIG. 1 shows the main portion thereof.

In this embodiment, the body (drum sleeve 2) of the cooling drum 1 is a cooling sleeve 2b and a rigid sleeve 2.
c and an outer peripheral coating (for example, Ni plating) 2a, the cooling sleeve 2b and the rigid sleeve 2c are metallurgically bonded by diffusion bonding, and the outer peripheral coating 2a is coated with the cooling sleeve 2b by plating.

The cooling liquid hole is formed by penetrating the cooling sleeve 2b through the axial cooling liquid hole 10a in the axial direction and in the radial direction by forming the radial cooling liquid hole 10b.
a and 50b (see FIG. 3).

A control member 3 is installed in the axial cooling liquid hole 10a, and a hollow hole 3a is provided inside the shaft. A seal packing 20 is provided on the support member 4 of the control member 3 to support the control member 3 and prevent the cooling liquid from flowing into the space 7.

A seal lid 5 is provided at the end of the axial cooling liquid hole 10a.
Was provided and tightly sealed by welding 6. At the time of this seal welding, as shown in FIG. 2, the lid cooling jig 30 was pressed against the central portion of the seal lid 5 and the seal lid 5 was welded while cooling water 31 was circulated. At this time, in order to improve contact heat transfer between the seal lid 5 and the lid cooling jig 30, a thin copper wire was sandwiched and pressed as the heat transfer material 32.

As the above-mentioned welding method, the drawing of TIG welding using the welding torch 40 and the filler wire 41 is shown, but a welding method having a high energy density such as electron beam welding may be used. When the TIG welding method is adopted, an annular groove 11 may be provided around the welded portion 6 as shown in FIG.

At the time of welding, the periphery of the weld 6 and the seal lid 5 are heated, but since the control member 3 is hollow, a large back pressure is not applied to the molten metal, and good welding can be performed. became. Further, even when the cooling drum 1 is used, the sealing of the cooling liquid is a two-stage seal of the sealing packing 20 and the welding 6, so that the reliability of the leakage of the cooling liquid is high.

[0017]

As described above, according to the present invention, a plurality of cooling liquid holes substantially parallel to the drum rotation axis are provided in the vicinity of the inner peripheral surface of the continuous casting cooling drum, and inside the cooling liquid hole, A cooling liquid flow control member having a through hole in the axial direction, and a support member for mounting the member in a liquid-tight manner inside the cooling liquid hole,
Since the seal lid that airtightly shields the support member from the outside is provided, it is possible to provide a welding structure capable of ensuring the seal of the cooling liquid flowing to the cooling drum, and thus the cooling liquid sealing technology is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a cooling drum according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the welding work situation of the cooling drum according to the first embodiment of the present invention.

FIG. 3 is an overall view of a cooling drum according to the present invention.

FIG. 4 is a sectional view of a conventional cooling drum.

[Explanation of symbols]

 1 Cooling Drum 2 Drum Sleeve 3 Cooling Liquid Flow Control Member 3a Hollow Hole 4 Supporting Member 5 Seal Lid 6 Welding 7 Space 10a Axial Cooling Liquid Hole 20 Seal Packing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiichi Yamamoto 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries Ltd. Hiroshima Research Laboratory

Claims (1)

[Claims] 1. A cooling drum for continuous casting, which rotates in mutually opposite directions with a predetermined gap kept between them, to produce a thin plate by pouring molten metal into the gap, the drum rotating in the vicinity of the inner peripheral surface of the drum. A plurality of cooling liquid holes substantially parallel to the axis are provided, a cooling liquid flow control member having a through hole in the axial direction is provided inside the cooling liquid hole, and the cooling liquid flow control member is mounted inside the cooling liquid hole in a liquid-tight manner. A cooling drum for a continuous casting apparatus, comprising: a support member; and a seal lid that hermetically shields the support member from the outside.