JPH06206Y2 - Metal continuous casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a continuous casting apparatus for metal, and more particularly to an apparatus for uniformly and stably supplying gas and / or lubricating oil to the inner peripheral surface of a forced cooling mold. It is about.

[Prior Art] In continuous casting of metals, especially non-ferrous metals such as aluminum and magnesium, a molten metal reservoir (header) is connected to the upstream end of a forcibly cooled cylindrical mold, and solidified casting is performed from the downstream end of the mold. A metal continuous casting device provided with a mechanism for continuously pulling out lumps is widely adopted.

Continuous casting of metals includes vertical continuous casting and horizontal continuous casting.

FIG. 4 is a vertical cross-sectional view of an example of a hot top continuous casting apparatus used in the vertical continuous casting method, in which the inner peripheral lower end surface of the header overhangs inside the cylindrical mold and has an overhang. In such a continuous casting apparatus, the ingot is cooled by the cooling inner wall surface of the cylindrical mold 1 itself and the cooling water discharged from the cooling water flow passage 2 formed inside the mold through the injection port 3, and the molten metal is melted. 8 is once held in the header 4 having the overhang 5, and then continuously supplied to the solidification section 7.

In continuous casting, in order to prevent seizure between the molten metal or ingot and the mold and to obtain a good ingot casting surface, it is necessary to keep the inner wall surface of the mold a lubricating surface, for example, supplying lubricating oil to the inner wall surface of the mold. Is done. In addition, a method of introducing a gas such as air directly under the overhang portion has been proposed for improving the casting surface (Japanese Patent Publication No. 54-4284).
No. 7). The gas and / or the lubricating oil is introduced under the overhang 5 through a narrow slit 9 formed between the lower part of the header 4 and the upper part of the mold 1 to the extent that the molten metal is not inserted. The lubricating oil may be introduced from the lubricating oil supply port 10 opened on the upper part of the inner wall surface of the mold as shown.

This type of system is also adopted in a horizontal continuous casting apparatus, an example of which is disclosed in JP-A-61-71157.

As described above, conventionally, the gas such as air or the liquid lubricating oil is supplied into the mold through the narrow slits, grooves, or pores that do not allow the molten metal to be inserted.

[Problems to be Solved by the Invention] In the continuous casting apparatus as described above, the slits, grooves, pores, etc., which are the supply passages for the gas or liquid lubricating oil, have such a fine dimension that the molten metal is not inserted, and It is an essential requirement that gas and lubricant be uniformly dispersed and supplied to the inner peripheral surface of the mold. However, at present, these requirements are not sufficiently satisfied.

Such a problem becomes more difficult in a slab (a rectangular cross-section ingot for rolling) in which the mold is large, as compared with the case of a billet (casting rod) in which the mold is relatively small.

That is, the header is in contact with the high temperature molten metal, while the mold has a surface that contacts the molten metal and a surface that is cooled by water. However, it is inevitable that distortion will occur, and such twisting or distortion causes changes in the fine opening size of the gas or lubricating oil flow path, which makes the supply of gas or lubricating oil extremely uneven, and makes good ingots. It was found that it was difficult to obtain a casting surface.

In a horizontal continuous casting machine, the above thermal effect is even greater. In other words, the gas and lubricating oil supply flow paths and openings are designed in advance in detail in response to the deviation of gravity exerted on the molten metal.
However, due to the above thermal influence, these considerations are utterly neglected, and it is difficult to obtain a good ingot casting surface.

The present invention solves the non-uniform supply of gas or lubricating oil caused by twisting or distortion of the header or mold by heating or cooling the pores or slits for supplying gas or lubricating oil,
The purpose is to stably cast an ingot having a good casting surface.

[Means for Solving the Problems] In order to solve the above problems, the present inventors have succeeded in uniformly distributing and supplying the distortion of the mold and the header to the passage of gas and lubricating oil. Completed the present invention.

That is, the present invention relates to a metal continuous casting apparatus in which a molten metal reservoir (header) is connected to the upstream end of a forcibly cooled cylindrical mold and a mechanism for continuously drawing out a solidified ingot from the downstream end of the mold is provided. When supplying gas and / or lubricating oil from between the molten metal reservoir (header) and the mold, insert a thin insert plate between the lower surface of the header and the upper surface of the mold, and further fireproof between the lower surface of the header and the insert plate. This is a continuous casting device for metal, which is characterized in that a fiber layer is charged.

Here, the insert plate is an annular plate body sandwiched in the slit, the material is a metal, such as ceramics that does not contaminate the molten metal, and is possible if it has a certain heat resistance, for example, when casting aluminum Can be used with an aluminum plate.

As for the thickness, the slit is relatively narrow, and as will be described later, it is necessary to have some elasticity and flexibility, so in the case of an aluminum plate, it is about 0.05 to 1.0 mm, preferably about 0.2 mm. An aluminum plate having a thickness of 1 is preferable.

The refractory fiber may be any fiber that is heat resistant and inert to the molten metal, but is preferably a material that is difficult to wet with the molten metal. For example, the molten aluminum is a non-woven fabric or a woven fabric made of carbon fiber, alumina fiber, silicon carbide fiber and the like. The thickness of the fireproof fiber layer in the charged and assembled state can be about 0.2 to 3 mm. These materials have elasticity and cushioning properties and are functionally satisfactory. Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is an example of an apparatus according to the present invention and shows a longitudinal cross section in the short side direction of a mold of an apparatus used for a rectangular ingot for rolling. That is, in the present drawing, a mold 1 having a lubricating oil supply port 10 and a gas supply port 6 bored therein and a header 4 are provided on the mold 1, and the mold and the header are vertical through bolts (not shown). It is tightly connected by a nut. The gas supply port opens from below between the header and the mold toward the bottom of the overhang 5. The insert plate 13 and the fiber layer 12 are sandwiched between them,
The opening of the gas supply port is adjusted.

FIG. 2 shows another embodiment as gas and lubricating oil flow paths.

The figure is a perspective view of the upper surface of the mold. Gas is introduced from an annular groove 14 on the upper surface of the mold and is supplied to the inside of the mold through distribution grooves 15 provided at regular intervals. The lubricating oil is supplied from an annular pipe line 16 arranged inside the mold through a rising pipe line 17 and horizontal distribution grooves 18 provided at regular intervals.

The insert plate of the present invention is placed on this upper surface, and a fire resistant fiber layer (not shown) is inserted on the insert plate, and a header is crimp-connected to the upper part thereof.

FIG. 3 is an enlarged front view of the boundary between the mold and the header of the apparatus shown in FIG. 2 as viewed from the side of the mold internal wall.

FIG. 3 (a) shows a fireproof / heat insulating fiber layer 12 and an insert plate 13 between the header 4 and the mold 1 in a state before use.
Sandwiched between. In this case, the mold or header is distorted due to heat, and the distance changes greatly. However, as shown in FIG. 3 (b), the insert plate follows the mold deformation due to the elasticity of the fireproof / heat insulating fiber layer. It has become possible to maintain a uniform opening degree of the gas and lubricating oil supply ports and to maintain a uniform supply amount.

If this is simply the insert plate, it cannot reliably follow the deformation of the mold, and for example, as shown in FIG. 3 (c),
There is even a risk that the supply of gas or lubricating oil will become non-uniform or that the molten metal will be inserted and casting will become impossible.

On the other hand, the concept of continuous casting of metal by sandwiching an inorganic heat-resistant fiber between the header and the mold has existed for a long time, but simply casting by sandwiching the fiber causes the fiber to stick to the molten metal during casting and torn off. It has been known that not only the molten metal is caught on the surface of the ingot, but also molten metal is inserted into the hole formed by being torn off, which causes a trouble, and improvement is required.

However, it has been found that this problem can be avoided when using fibers that are difficult to wet the molten metal.

In this case, the refractory fiber layer deforms well following the distortion of the header and the mold, but since there is no function to adjust the opening degree of the gas or lubricating oil supply port, gas etc. is discharged from the entire fiber layer. However, there remains a problem in adjusting the aperture.

In this way, it is necessary to use a combination of insert plate and refractory fiber layer to adjust the opening degree of the gas or lubricating oil supply port,
A remarkable effect can be exhibited only when the two are combined as in the present invention.

FIG. 2 is an example (perspective view) of gas and lubricating oil supply passages on the upper surface of the mold, which are open on the molten metal side of the gas and lubricating oil supply ports, and the upper surfaces are flush with each other. There is. Therefore, it can be seen that if the insert plate is in close contact with this upper surface, even if the mold or header is slightly distorted, the opening is not affected and the same area can be maintained.

[Embodiment] A header is connected to the upstream end of a cylindrical mold having gas and lubricating oil supply passages as shown in FIG. 2, and an aluminum plate of 0.2 mm is inserted as an insert plate in the middle, and the header and the insert plate are further inserted. Between the and ICI company (UK) Safir paper (trade name), (thickness 1mm, weight per area 0.015g / cm ² , component 99% Al ₂ O ₃ ),
Air was used as the pressurized gas and castor oil was used as the lubricating oil. Castor oil was cast into a slab (rectangular ingot for rolling) while supplying 50 ml per ton of aluminum at a pressure slightly higher than the gas pressure.

During casting, the air pressure remains constant without adjustment, the hydraulic pressure (supply amount) is stable, and operation is easy. In addition, even after operating for a long time, the sapphire paper was not torn off by the molten aluminum, and there were no casting problems due to the insertion of the molten metal.

[Effects] In the continuous casting apparatus in which a flow path for supplying lubricating oil or gas according to the present invention is formed, a thin insert plate (aluminum plate) is sandwiched between the mold and the header, and a thin refractory fiber is further provided between the header and the insert plate. By adopting a structure that contains layers, the twisting and distortion of the header and mold due to heat are absorbed to effectively prevent changes in the gas or lubricating oil supply port, and maintain uniform dispersion of the gas or lubricating oil supply. Then
As a result, an ingot having a good casting surface can be stably and continuously cast. The effect is particularly remarkable when applied to continuous casting of large ingots such as rolling slabs.

[Brief description of drawings]

1 to 3 are partial sectional views of a continuous casting apparatus used in the present invention. FIG. 4 is a conceptual diagram of an apparatus for explaining conventional continuous casting of metal. 1. Mold 2. Cooling water channel 3. Injection port 4. Header (melt pool) 5. Overhang 6. Gas supply port 7. Coagulation part 8. Molten metal 9. Slit 10. Lubricating oil supply port 11. Sealing 12. Fiber layer 13. Insert plate 14. Annular groove 15. Distribution groove 16. Circular conduit 17． Rise line 18． Horizontal distribution groove

Claims (1)

[Scope of utility model registration request] 1. A continuous casting apparatus for metal, wherein a molten metal reservoir (header) is connected to an upstream end of a forcibly cooled cylindrical mold, and a mechanism for continuously drawing out a solidified ingot from the downstream end of the mold is provided. When supplying gas and / or lubricating oil from between the molten metal reservoir (header) and the mold,
A continuous casting apparatus for metal, wherein a thin insert plate is sandwiched between the lower surface of the header and an upper surface of the mold, and a refractory fiber layer is inserted between the lower surface of the header and the insert plate.