JPS61144245A - Twin drum type continuous casting machine - Google Patents

Abstract

PURPOSE:To prevent the leakage of a molten steel, etc. by constituting a side dam which is divided to a side dam for a molten metal pool and a side dam for press welding part of a solidified shell and making retreatable the dam for the press welding part of the solidified shell toward the outside. CONSTITUTION:A molten metal 2 is pooled between drums 1 and 15. The side dam is constituted of the two dams; the side dam 5 for the molten metal pool part and the side dam 3 for the press welding part of the solidified shell. The side dam 5 contacts tightly with the side of the drums 1, 15 via brackets 6 to prevent the leakage of the molten metal 2. The side dam 3 is pressed toward the side of the drums 1, 15 by the press welding part 12 of the solidified shell via a springs 4. The leakage of the molten metal 2 is prevented and the sliding wear of the dam 3 is decreased by such mechanism. The leakage prevention of the molten metal, the decrease of the sliding wear of the side dam, the improvement of safety, etc. are thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention provides a method for pooling molten metal between two rotating drums,
This invention relates to a twin-drum continuous casting machine that continuously produces thin plates by cooling the drum while rotating.

[Background of the invention]

Generally speaking, twin drum type continuous casting machines are
As seen in the publication, the molten metal is pooled between two drums, the molten metal is cooled and solidified on the surfaces of the two drums, and the two drums are then driven to rotate to press the two solidified shells together to form a thin plate. This is a continuous production device.

In the thin plate manufacturing method using such an apparatus, as pointed out in the above-mentioned publication, coagulation inevitably progresses more easily at the width edges of the plate than at the center of the plate.On the other hand, the two drums shown in FIG. At the narrowest inter-drum crimping section 12 that crimps the solidified shells 30 and 31 generated at 1.15, a pressure P for crimping the solidified shells is generated. When the solidified shell is pressed in this way, pressure P is generated on the surface of the drum, but at the same time, pressure Pg and Pg are generated in the lateral and vertical directions, respectively, as shown in FIG. That is, the material compressed by the drum tries to escape laterally and vertically, creating pressure in each direction as described above.

FIG. 4 is a vertical cross-sectional view of the center shown in FIG. 3. In the crimp portion 12 of the solidified shell 30, 31 shown in FIG. A force is applied to open it outward at Pg. In particular, as shown in the above-mentioned publication, if the solidification progresses excessively at the width edges of the plate, this force increases accordingly.

Generally, when manufacturing steel materials, the temperature of the molten metal is 1500
1:1', and firebricks that can withstand such high temperatures are used for the side dam (Fig. 4).

However, since the temperature of the solidified steel is close to 1350-1400C, the pressure Ps generated in the crimping part 12 that crimps the solidified steel is equal to the deformation resistance of the high-temperature steel material, and a large pressure of about 200 Kf/- is applied. have

On the other hand, the side dam 20 shown in FIG.
Since it is made of refractory brick, its strength is extremely low at high temperatures as described above, and as the thin plate 19 is pulled downward due to the pressure Pg shown in Fig. 4, it rapidly wears out, and the double drum series This prevents the commercialization of casting machines on an industrial scale.

Further, the side dam 20 shown in FIG. 4 is fixedly disposed from the outside and is slidably attached to the rotating drum 1.15 (not shown). Therefore, if the mounting force of the side dam 20 is weak, the mounting force of the side dam 20 will be defeated by the pressure P8 shown in the same figure, and the side dam 20 will retreat outward, causing accidents such as leakage of hot water or the protrusion of the solidified shell to the side. occurs.

As a means of solving the above problems, in the example of the above publication,
It has been proposed that both ends of the drum's outer peripheral surface be made of a material with low thermal conductivity. In areas with low thermal conductivity, the thickness of the solidified shell formed is thin, so even if the refractories are crimped, the pressure will be lower than that of the other central parts, resulting in the effect of extending the life of the side refractories. It is assumed that. however,
Even with such means, it is difficult to effectively solve all of the above problems.

[Purpose of the invention]

In view of this situation, the present invention has been developed to prevent material from protruding to the side of the υ width end by crimping at the two solidified shell crimping parts described above.
The object of the present invention is to provide a twin-drum continuous casting machine equipped with a side dam that can effectively prevent sliding wear and abrasion of the side dam without causing lateral leakage of molten metal. .

[Summary of the invention]

In order to achieve the above object, the present invention has a configuration of the side dam, in which the molten metal leaks if the contact between the drum side surface and the side dam is poor in the upper molten metal pool part of the side dam.
The entire side dam is divided into two parts: one for this molten metal pool and another for the solidified shell crimped part that allows the material to protrude to the side of the width by crimping at two solidified shell crimped parts. It is.

In particular, the side dam for the solidified shell crimping part can be configured to flexibly escape to the side in response to the crimping pressure.In this case, at the start of casting, it is in close contact with the side of the drum, preventing molten metal from leaking. can do. Further, after the solidified shell is crimped, it can escape to the side, so that large pressure does not act on the side dam of the crimped portion, and damage to the refractory can be prevented.

The present invention will be explained in detail below based on illustrated embodiments.

[Embodiments of the invention]

1 and 2 show one embodiment of the present invention.

First, the bathtub 2 is placed in the pool of two drums 1.15 (
Figure 2). This molten metal 2 is prevented from leaking to the side by a side dam provided on the side of the drum 1115.

In the present invention, the side dam is divided into two parts: a molten metal pool side dam 5 and a solidified shell compression bonding side dam 3.

The drums 1 and 15 are supported by bearing boxes 9 and 10 inserted into the shaft 8 and the shaft 40 at a constant 7.11. 8
The thin plate 18 is produced only by rotating it around the .

Next, the structure and function of the side dam of the present invention will be explained in detail using FIG.

The side dam 5 that pools the molten metal 2 is the stand 7.
．． The brackets 6 attached to the brackets 11 are pressed tightly against the sides of the drums 1 and 15 to prevent the molten metal 2 from leaking to the sides.

On the other hand, since the side dam 3 is provided below the side dam 5 and is pressed against the sides of the drums 1 and 15 by the spring 4 at the solidified shell crimping part 12, the material is pushed laterally at the solidified shell crimping part 12. If pressure Ps is generated as the side dam 3 tries to protrude, the side dam 3 escapes to the side, and the pressure generated in this portion corresponds to the force of the spring 4. Therefore, if the force of the spring 4 is appropriately selected to be sufficiently small, the pressure Ps acting on the side surface of the side dam 3 can be reduced, so the sliding wear on the side surface of the side dam is reduced, and the wear life can be greatly improved. .

FIG. 6 shows an example in which the side dams 13 at the compressed waste portions 12 of the solidified shells 41, 42 are made of fireproof wool to provide flexibility. In this example as well, the side dam 5 that pools the molten metal 2 and the side dam 13 of the solidified shell crimping part 12 are not integral but are separated, and the latter is constructed so that it can be retracted to the side compared to the former. .

Although this fireproof wool has some flexibility, it may be replaced with clay or the like for practical purposes. It may also be a clay body shaped by drying using an amorphous refractory.

In short, it is sufficient that hot water does not leak to the sides when pouring starts. Once the solidified shell is formed and the crimp area is filled,
This is because molten metal will never leak into this part, even if it is virtually unprecedented.

Therefore, there is virtually no problem in using a method in which the clay is packed with clay as described above, and after a solidified shell is formed and compression bonding begins, the clay force is removed by compression pressure.

In addition, the side dam 3 shown in Fig. 1 can be retracted by a spring 4, but the spring 4 is not used, and after the solidified shell starts to be crimped, it is automatically retracted by an actuator such as a cylinder. You may retreat to the side.

Furthermore, from the viewpoint of reducing wear due to sliding with the crimped solidified shell end, the side dam 3 may be made of a wear-resistant metal member such as bronze or aluminum block, and the inside may be internally cooled.

FIG. 7 shows an example in which a fireproof box 14 is provided above the drums 1, 15. In this case as well, the side dams include the side dam 5 that pools the molten metal 16 and the solidified shell 4.
1.42 of the crimp portion 12 and the side dam 3, the latter side dam can be retracted to the side.

In addition, the actual specifications of the thin plate continuous casting machine implemented in the present invention will be shown below.

The drum has a diameter of approximately 600-1200 mm and a width of 600-160 mm.
0+111+ is used. For this, thickness 2
~5 rm, and widths of 600 to 1600 m can be produced at casting speeds of 20 to 60 m/-.

The material of the thin plate to be cast is ordinary steel, stainless steel,
Various materials such as aluminum are possible.

〔Effect of the invention〕

As detailed above, according to the present invention, the following effects can be obtained.

■ The side dam of the twin-drum continuous caster is divided into two parts, one for the molten metal pool and the other for the solidified shell crimping area, so even if the latter is pushed sideways by the pressure from the solidified shell crimping, the molten metal will This effect does not affect the side dam for the pool, and the function of pooling molten metal is not impaired.

Further, even if the side dam for the solidified shell crimping part is damaged, the molten metal will not leak because this part is filled with the crimped solidified shell. Also, since this side dam is small, it is economical because it can use consumable materials such as cheap clay.

■ Since the side dam corresponding to the crimping of the solidified shell formed by two drums can be retracted to the side of the width of the plate, no large pressure is generated between the material and the side dam, and the sliding of the side dam is prevented. Dynamic wear can be reduced.

■ The entire side dam is constructed separately for the solidified shell crimping section and the molten metal pool section, so even if the former side dam retreats to the side, the latter side dam for the bath pool section remains in close contact with the side of the drum. Since the molten metal can be left in place, there is no sideward leakage of the molten metal, and safe work is possible.

■ At the start of pouring molten metal, the side dam for the solidified shell crimping part is also in close contact with the side of the drum, so molten metal will not leak.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the use of a two-stage side dam according to an embodiment of the present invention in a twin-drum continuous casting machine, with Figure 1 being a side sectional view and Figure 2 being a front view. , Figures 3 and 4 are diagrams showing the case where a conventional side dam is used.
FIG. 4 is a front view, FIG. 4 is a side sectional view, FIG. 5 is an explanatory diagram showing the state of pressure generation when solidified shells are crimped, and FIGS. 6 and 7 each show other embodiments of the present invention. FIG. 1.15...drum, 2.16...molten metal, 3.13
. . . Side dam for solidified shell crimping portion, 4 . . Spring, 5 . Side dam for molten metal pool portion, 12 . ~19... thin plate, 20... side dam,
30°31.41,42... Solidified shell.

Claims (1)

[Claims] 1. Side dams are provided on the sides of two rotating drums,
During this time, the molten metal is pooled, and while the two drums are rotated to face each other, the pooled molten metal is cooled to form a solidified shell on the surfaces of the two drums, and a solidified shell is formed on the surface of each drum. In a continuous casting machine that produces a thin plate by pressing the shaped solidified shell at the narrowest gap between the two drums, side dams are provided on the sides of the two drums, one for the molten metal pool part and one for the solidified shell crimping part. A twin-drum continuous casting machine characterized by being configured in two parts, including a side dam. 2. The twin-drum continuous casting machine according to claim 1, wherein the side dam for the solidified shell crimping portion is configured to be retractable to the outside with respect to the side dam for the molten metal pool portion.