KR910006550B1 - Method and apparatus for feeding and continuously casting molten metal with inert gas applied to the mouing mold surfaces and to the entering metal - Google Patents

Abstract

Methods and apparatus for feeding and continuously casting molten metal (1) are described in which inert gas is applied to the moving mold surfaces and to the entering metal for the protection or shrouding of the molten metal surface within the mold cavity from oxygen and other detrimental atmospheric gases. The shrouding is by means of inert gas injected into the mold through a semi-sealing nosepiece (7), or directed at the mold cavity and passing through the necessary slight gaps around the nosepiece. At the same time, such inert gas is further circulated by channeling or shielding the circulated gas for blanketing and diffusing of the inert gas along the moving mold surfaces (9, 10) for cleansing them of undesired accompanying gases, such as atmospheric oxygen, water vapor, sulphur dioxide, carbonic acid gas, etc. as the mold surfaces approach the nosepiece before entering the mold region. In installations where the inert gas is directed at the mold cavity from above and/or below the nosepiece, the gas is ejected at a relatively slow flow rate so as to be noiselessly ejected, i.e. without audible disturbance, the objective being to avoid entrainment of air. Heavier-than-air inert gas may advantageously be used above the nosepiece, while lighter-than-air inert gas is simultaneously used below it.

Description

Method and apparatus for continuously casting by supplying molten metal while supplying inert gas to the surface of moving mold and flowing molten metal

1 is a perspective view of an inlet or upstream end of a continuous casting machine embodying the present invention in an upstream position and an outer portion of a double belt carriage;

2 is a partially cut-away sectional view showing that the casting part is inclined downward at a predetermined inclination angle as a casting machine for carrying out the present invention toward the outer axis of the double belt carriage.

3 is a partial sectional view of an upstream end and a supply end of the machine, in which a semi-closed nosepiece for casting a relatively thin metal part while supplying an inert gas is installed to form a shape particularly suitable for a low melting point metal. .

4 is an enlarged perspective view of one of a pair of support clamp structures of a refractory nosepiece installed to distribute an inert gas to one of the clearance gaps in close proximity.

5 is a perspective view showing a cross section of a refractory quick feed nosepiece or wide nosepiece having a shape particularly suitable for internally feeding low melting point molten metal.

FIG. 6 is a perspective view of a nosepiece with a passage through which inert gas is introduced directly into the cavity in the inlet of the moving mold as shown in FIG.

7 is a plan view of a tundish which is particularly suitable for internally supplying a high melting point molten metal.

8 is a cross-sectional view of the tundish of FIG. 7 associated with an upstream end or feed end of a continuous casting machine for casting a relatively thin metal cross section while supplying an inert gas.

FIG. 9 is a cross-sectional view similar to that of FIG. 3 generally showing a gas sealing cover funnel and gas sealing passages coupled with a metal supply device for continuous casting of high melting point metals while supplying an inert gas with an open-open metal supply. .

* Explanation of symbols for main parts of the drawings

1 molten metal 2 launder

4: tundish 7: nosepiece

9,10: Moving mold surface (belt) 31: Fireproof material

The present invention provides a separation between two spaced apart portions of two cooling surfaces for cooling a cast metal for continuous casting of strips, sheets, slabs, plates, rooms or billets directly from the molten metal flowing through the semi-closed nosepiece. The present invention relates to a method and apparatus for continuously casting by supplying molten metal into a casting part of a moving mold.

In the present invention, the structure and operation of the casting machine for supplying the molten metal through the nosepiece into the moving mold or casting portion located between the opposite portion of the two water or liquid-cooled moving mold having a surface defining the mold portion It is described in detail.

The moving mold in the embodiment is a flexible strip or belt that acts as a cooling surface and encircles and confines the molten metal flowing into the moving mold in between, simultaneously solidifying the molten metal gradually to produce strips, sheets, slabs, It is manufactured in the form or product such as a plate, bar or billet, etc., and the product is referred to as a “cast product” or a “cast product”. Continuous casting machines using flexible belts or belts, often referred to as double belt casting machines, have been developed and manufactured over the years by Hazellet Strip-Casting Corporation in Burrmont Maleth. If more information is needed about the various features of this machine, it can be found in the patent assigned to the present invention and assigned to the company.

When the molten metal is introduced, fed, or charged into a moving mold of a continuous casting machine inclined almost horizontally or downwards, it has an acceptable quality and surface properties with a commercially available suitable surface quality. Determinants for castings include: avoiding abrupt speed changes of the molten metal introduced, avoiding turbulence of the molten metal, limiting the metal's exposure to reactive atmospheres or other reactants, and Providing the desired interaction between the metals as defined by it.

In molten metal processing and dispensing systems that transfer the molten metal to be cast from the melting furnace or the holding furnace to the casting part of the casting machine, it is usually avoided every time it is transported downward to avoid the restrictions and limit exposure of the molten metal to an uncontrolled atmosphere. This is done by under-pouring. Therefore, the molten metal is sucked down the surface of the container without being injected into the lip, leaving behind surface oxides and many foreign substances. The downward injection technique also moves or introduces the molten metal into the next vessel at the bottom of the metal surface to minimize agitation of the molten metal and avoid contact with the atmosphere or coral-containing agent. Such limitations and techniques usually deal with molten lead, zinc, aluminum, copper, iron and steel, or alloys of these metals and other metals. Failure to comply with the above limitations, techniques, or the like, adversely affects the metallurgical properties of the metal to be cast, or otherwise leads to the formation of uncontrollable oxides that present difficulties in the molten metal feeder and mold. In some of these metals, the same difficulty may be caused by relatively small amounts of oxygen. In addition, hydrogen released by contact with a hot molten metal or a combustion gas containing hydrogen may be dissolved in the cast metal. Such dissolved hydrogen, even in small amounts, leads to undesirable porosity. In some conditions, nitrogen is also not good.

The problem of oxides in gutters, troughs and tundishes has been solved by supplying a reducing atmosphere to the surface of the molten metal and simultaneously performing downward injection. Such a reducing atmosphere is obtained through the combustion of oxygen-deficient combustion oils or gases. In the case of aluminum, the oxide protective film will remain quiet on the surface of the open container if it is designed to minimize agitation, in which case the reducing atmosphere is not necessary for the preliminary step of transporting the aluminum with downward injection. The trapped oxides and other impurities rarely occur in commercial vertical continuous casting methods using hard molds with open top and bottom. In this vertical casting method, injection into the mold is done by injecting downward at a relatively low speed. Oxides and other impurities formed have time to rise to the top and are likely to freeze in the center or core portion of the ingot that remains in the top oxide layer formed thereon or has a relatively large cross section. In vertical casting to make a product having a large cross-section, trapped oxides and other impurities do not damage or become unacceptable to the casting.

The situation when casting with a continuous caster inclined almost horizontally or downwards is quite different and unique.

For example, when the mold is extended as long as in a double belt casting machine, the surface of the continuously moving mold is usually operated at a relatively high linear speed. Here, the trapped oxide or other impurity problem may become more severe and unacceptable to the casting.

When casting relatively thin parts near horizontal, the downward injection technique of introducing molten metal into the moving mold of the continuous casting machine is usually not practical or easy because of insufficient vertical clearance between the mold surfaces.

When casting such a relatively thin portion, molten metal is usually introduced through the semi-closed nosepiece. As a practical matter, the nosepiece should be slightly spaced from the surface of the mold near the inlet of the mold to compensate for the inevitable variables and deformations of the mouth of the continuous mold. The separation from the surface of the continuous-moulding mold is also necessary to allow the allowance for forming and shaping into refractory materials with suitable physical, chemical and thermal properties for the operations required to handle molten metal. It is difficult to shape and maintain a firebrick suitable for this required purpose within a range that is close to and consistent with the operating allowance.

Therefore, the fit between the nosepiece supplying the molten metal and the surface of the continuous-moulding mold is relatively loose so that a new nosepiece conventionally has an initial gap of 0.25 mm (0.010 inch). However, this gap is widened by wear, especially at the top of the nosepiece. Regular leakage of most of the molten metal around the closed surface of the nosepiece is inevitable if the moving mold operator attempts to continuously fill the mold with molten metal against the nosepiece. In other words, trying to keep the mold part full of molten metal relative to the nosepiece is usually not practical. In fact, a gap of about 0.5 mm (0.020 in) around the nosepiece usually causes the low surface tension molten metal to easily and quickly solidify, eventually causing undesired blockages on the nosepiece and destroying the nosepiece. )

As a result, it is necessary to avoid filling the mold to avoid the molten metal filling up to the nosepiece. This filling is somewhat marginal for aluminum because of the high surface tension that tends to prevent leakage through the gap. However, even in aluminum, the upper mold relief avoids the shock head of molten metal, which is quite high because the final pressure of the molten aluminum in the gap near the nosepiece exceeds the surface tension causing leakage. Therefore, even in aluminum, the operator will maintain the height of the molten metal of the mold not higher than the front lower edge of the nosepiece, so that a significant amount of gas cavity will appear.

In fact, small gas cavity remains apparent despite a small head with a slightly higher die than anywhere in the mold and a metal pressure higher than the location of the residual gas cavity in the closely-fitting northpiece during aluminum continuous casting. . This unintended phenomenon of residual gas cavities is believed, in part, to be the result of the traction of the moving mold surface on the molten metal surface increased by internal supply forces and surface tension. Therefore, as a result of intentional operation to avoid the chance of leakage of molten metal through the gap near the nosepiece or as a result of dynamic traction even if unintentional, it is usually a gas space or cavity in the mold. Will be.

This cavity is located near the front end of the nosepiece, above the mold, above the height of the molten metal.

At the nosepiece surface located within about 0.5 mm (0.020 inch) near the surface of the continuous-mould mold, it can be seen that the operator cannot observe at any time the physical state or height of the molten metal in the mould. Therefore, the operator cannot control the height of the molten metal or the size of the cavity depending only on the neck side. Novel methods and apparatus for overcoming the difficulties associated with operator neck failure for injection level control are described and claimed in US Pat. Nos. 3,864,973 and 3,921,697, the publications of which are incorporated herein by reference. The methods and apparatus of these patents have been successfully applied to double belt structurers where there is no need for human observation of molten metal. Controlling with a double belt casting machine has proved practical for commercial production. Therefore, using a properly fitted nosepiece is a practical way of introducing metal into the casting while maintaining a controlled cavity on top of the mold between the nosepiece and the molten metal.

Molten aluminum and alloys are particularly reactive. They can be combined with other metals, gases and refractory materials. For example, in the molten state during continuous casting, aluminum alloys are susceptible to random reaction or influence with atmospheric oxygen, water vapor and micro atmospheric gas contaminants. The continuous casting of the aluminum alloy containing magnesium will cause trituration or linearity on the casting surface and reduce fluidity in the molten state by any atmospheric contact.

Uncontrollable oxidation reactions and the reaction of molten metals can be expressed in two ways when continuously casting relatively thin parts. That is, firstly, a problem of lack of clearance in the apparatus for injecting metal downward into the continuous moving mold part. Second, the area-to-volume ratio increases with a thinner portion. Since the oxidation reaction is usually a surface or surface reaction, the oxide formed on the relatively thin continuous casting part constitutes a relatively large proportion compared to the thick part. It is also practical to strip the oxide from the surface of the casting in thick parts, but not in thin parts.

The oxidized portion occurs when using a double belt, and the same problem occurs in other continuous casting machines that cast relatively thin portions in a horizontally or downwardly inclined manner.

The relatively thin sections used herein are intended to range from 6 mm (1/4 inch) to 51 mm (2 inches), preferably from 6 mm (1/4 inch) to 38 mm (1 1/2 inch). will be.

It is an object of the present invention to continuously cast a metal product having an acceptable surface quality, surface properties and internal structure through a continuous casting machine which applies molten metal and fills it with moving molds that move horizontally or downwardly inclined. It is to provide a method and apparatus.

The molten metal flows into the upstream or inlet of the continuous mold while the gap is less than 1.27 mm (0.05 in.) With a clearance between the mold and the mold. Inert gas is supplied to the metal and the incoming metal to protect and surround the molten metal surface in the mold cavity from oxygen and other inhibited atmospheric gases. The beneficial effect is obtained by enclosing the supplied molten metal, the controlled cavity of the upper end of the mold and the surface of the moving mold with an inert gas injected through a semi-closed nosepiece or directed towards the mold cavity and through a clearance gap around the nosepiece. Can be achieved. This inert gas is further circulated to clean the unwanted gas entrainment or adherent moving mold surface associated with the mold surface as the mold surface approaches the nosepiece before entering the mold portion.

As a feature of the invention, as shown in the method and apparatus of the embodiment, a nosepiece made of a refractory material having a clearance gap of 1.27 mm (0.050 inch) or less from the surface of the continuous movement mold inserted into the upper flow end of the continuous movement mold portion The molten metal is fed into the interior through a single, small passageway, the nosepiece is secured up and down with a rigid support structure clamp, and inert through at least one passageway in at least one of the support structures. There is a step of quietly injecting gas into at least one of the narrow clearance gaps around the inserted nosepiece to cover the controlled cavity of the upper end of the moving mold portion and the incoming molten metal.

As another feature of the invention, as shown in the method and apparatus of the embodiment, it is inserted toward the inlet of the continuous moving mold part and meets the surface with a clearance gap of 1.27 mm (0.050 inch) or less from the surface of the continuous moving mold, Inject molten metal into the interior through at least one passage of the filled nosepiece and inject the inert gas directly into the controlled cavity at the inlet end of the mold through at least one additional passage within at least one portion of the inserted nosepiece. To improve the quality and characteristics of continuous casting products.

As an additional feature of the invention, the above method includes supplying an inert gas through at least one passage in at least one of the nosepiece support fixing structures while simultaneously supplying the gas through at least one passage in the nosepiece itself. It consists of the features described in the paragraphs of both sentences.

In another aspect, the present invention provides a moving mold by placing a sealing member or a structure member near at least one surface of the moving mold moving toward the inlet of the moving mold, and supplying an inert gas to a passage defined near the moving mold surface. The surface is immersed in an inert gas to convey and propagate this gas through the clear run gap by the nosepiece to the inlet of the moving mold.

As an additional feature, the present invention provides a method for cleaning and cleaning a mold surface by placing a sealing member or structure member near at least one moving mold surface moving toward the inlet of the moving mold for casting a relatively thin metal part. The quality and characteristics of continuous castings having a relatively thin part by supplying inert gas to the passage determined near the surface of the moving mold and removing the atmospheric gas and / or contaminant gas and / or water vapor which are transferred to and attached to the surface of the moving mold surface. To improve the step and the like.

Other features of the present invention include a metal supply nosepiece for supplying an inert gas to the moving mold surface forward while the moving mold surface converges toward the inlet of the moving mold to cast a relatively thin metal part. There is a supply of inert gas through passages and / or chambers associated with supporting fixture structures. Furthermore, the passages and / or chambers may include outlets directed axially toward each dam formed in a double belt caster that is immersed in an inert gas as it approaches the moving mold and then surrounded and purged. It may be.

Many of the advantages of the methods and apparatus in the embodiments described herein result from the following facts. In other words, through the clearance gap between the surface of the moving mold and the inserted metal supply nosepiece, it flows out of the inert gas in a relationship such as back-flushing, purging, immersion, and atmospheric pressure to surround the cavity itself. Inert gas can be introduced directly into any cavity in the upstream portion of the moving mold for casting a relatively thin metal part, usually in a horizontal or downwardly inclined orientation to form an inert gas pressure in the cavity slightly above Because of the fact that it can. Moreover, inert gas is introduced through at least one passage into the refractory material of the nosepiece itself, while the molten metal is fed in through the other passage of the nosepiece. The outlet of the gas passage is raised above the center line of the nosepiece so that inert gas can be surely introduced into any cavity in the upstream portion of the moving mold above the height of the molten metal.

Many of the advantages of the methods and apparatus in the embodiments described herein result from the following facts. That is, by moving an inert gas to at least one of the surface of the moving mold while the surface of the moving mold moves toward the inlet of the moving mold, it is usually located upstream of the moving mold casting a relatively thin metal part in a horizontal or downwardly inclined orientation. Inert gas can be indirectly introduced into any cavity. The inert gas is quietly introduced into the supporting fixed structure of the refractory nosepiece supplying molten metal through the passage and / or chamber, and at least one sealing member is firmly cast near the surface of the moving mold to effectively supply the inert gas to the moving mold surface. In addition, it causes the action of diffusion, enclosing, and purification of this gas on the moving surface.

Another feature of the present invention is to describe an apparatus for inert gas indirectly entering a mold through a clearance gap around a nosepiece. With this feature, two kinds of inert gases having different densities are advantageously used at the same time. In particular, an inert gas that is heavier than air is supplied to the top of the nosepiece. In this case, the gas does not disperse and tends to settle on the nosepiece and the upper support structure. At the same time, an inert gas lighter than air may be supplied to the bottom of the nosepiece. In this case, the gas is not dispersed and the nosepiece tends to rise against the bottom and the bottom support structure. As an example, a gas heavier than air suitable for use in the upper part is argon, about 35% heavier than air, and a lighter gas than air used in the lower part is nitrogen and about 3% lighter than air.

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to objects, features and advantages of the present invention. The same members in angular terms are shown with the same numbers. In the figure, the arrow direction indicates that the metal is supplied to the upstream end of the continuous moving mold and is cast in the downstream direction upstream of the moving direction of the metal supplied to the moving mold. In the drawings, the dimensions are not required and the emphasis is only on illustrating the principles of the present invention.

1 and 2 illustrate an embodiment of a continuous casting machine for metal using the present invention effectively. In this casting machine, molten metal (1) is fed through a feeding device, such as an injection box, a raid or a launcher (2), and is injected downward into a tundish (4) lined with a suitable refractory material (31). Flowing down through the inlet (3) to form. For the sake of clarity, in Figure 1, the lundyish is shown slightly retracted from the entrance into the moving mold. The flow rate from the trough 2 to the tundish 4 is controlled by a tapered stopper (not shown), which is mounted at the lower end of the control rod 5. From tundish 4 to molten metal 1 through nozzle or nosepiece 7 of refractory material or via tube 21 (FIG. 7) to inlet E of moving mold or casting part C Supplied. This inlet E is at the upstream end of the casting part C located between the substantially horizontal surfaces of each of the infinitely spaced up and down flexible cast belts (moving mold surfaces) 9 and 10 spaced apart. Casting belts are usually TIG welded low-temperature cold rolled steel strips. In addition, in order to roughen the surface that comes into contact with the molten metal, it is usually grit-blasted, followed by roller flattening and coating.

The casting belts 9 and 10 are supported and driven by respective upper and lower carriage phases, usually indicated by (U) and (L). Both carriages are mounted to the machine frame (11). Each carriage contains two main rollers or pulleys that directly support, drive and adjust the cast belt. These polys include upper and lower inputs or upstream pulleys 12 and 13 and upper and lower outputs or downstream polys 14 and 15, respectively.

The casting belts 9 and 10 are guided by a plurality of pinned support rollers 16 (FIG. 2) so that the opposite belt casting surface maintains a predetermined relationship over the entire length of the casting portion C. The pinned support roller 16 may be in the form described in US Pat. No. 3,167,830.

Flexible endless side dams (17) for holding metals, commonly referred to as mobile edge dams, are located on both sides of the casting to trap molten metal. Side dams 17 (only one in FIG. 2) are described, for example, in the above-mentioned US patent or In particular, as shown in 4,150,711 is guided to the input or upstream end of the casting machine by a guide member 35 shown partly mounted to the lower carriage (L).

In the casting operation the two casting belts 9, 10 are driven at the same linear speed by a drive mechanism 18 as described, for example, in patent 3,167,830.

As shown in Figure 2, the upper and lower carriages (U, L) are inclined in the downstream direction, so that the moving molding casting (C) between the casting belts inclined at an angle A with respect to the horizontal. Since it is inclined downward by the angle A, molten metal will flow easily into the inlet E of the casting column C. FIG. The inclination angle A is usually 20 ° or less, and the angle can be adjusted by the jack mechanism 50. Current preferred angles for aluminum and their alloys are 6 ° to 9 °. The intense heat flux exits through each cast belt by a high speed moving layer of liquid coolant supplied by the nozzle header 6 and moving back along the cooling surfaces of the upper and lower belts 9 and 10. The liquid coolant is supplied at a high temperature and the high velocity flow layer can be maintained by the methods described in patents 3,167,830 and 3,041,686. Currently good coolants are water containing corrosion inhibitors, having a temperature of about 21 ° C. (70 ° F.) to 32 ° C. (90 ° F.).

The casting P is conveyed and guided by a roller conveyor (not shown) after solidification has occurred at least throughout its outer surface and exits the casting machine.

For example, the nosepiece may be made of marinite (asbestos-resistant high temperature insulating material manufactured and sold by Johns Manville Co.) or other suitable refractory material to supply metals of low melting point such as lead, zinc or aluminum. Can be. This nosepiece 7 was made of a single piece of fireproof material, as in FIGS. 5 and 6. It is also possible to assemble a plurality of integral bodies that are fireproof materials.

As used herein, the term “nosepiece” is referred to collectively in a single integral part or in a plurality of integral members.

In order to support this fire-resistant nosepiece 7, a nosepiece sandwiched between the supporting fixed structures 25 and 26 and a rigid upper and lower support rollers 25 and 26 positioned above and below the nosepiece 7 in a high-odd state. There is. As shown in FIGS. 5 and 6, the fire resistant nosepiece 7 includes at least one metal supply passage 20.

In this embodiment, it can be seen that the two passages 20 extend in parallel with the downstream in the longitudinal direction beyond the nosepiece 7 with the central barrier 40 therebetween. The metal supply passage 20 has a rectangular cross section. It also has a small, high-profile shape that is suitable for casting relatively thin metal parts. In order to distribute the internally supplied molten metal smoothly and quietly into the moving mold C (FIGS. 2 and 3) without inappropriate turbulence formation, the downstream end of the metal supply passage 20 is numbered 41 ( It can be seen that the incisal side is opened in the downstream direction shown in FIGS. 5 and 6).

As shown in FIG. 3, the upper and lower support fixing structures 25 and 26 for fixing the fire resistant nosepiece 7 are usually similar in structure except that the lower ones are arranged in reverse order. The supporting fixed structures 25 and 26 are made of a rigid material, for example steel.

In FIG. 4, an enlarged state of the upper support fixing structure 25 can be seen. The structure has a rigid base plate 28 having a refractory nosepiece 7 and a fixed surface 42 that includes shallowly protruding lands 43 and grooves 44 that provide a firm and secure bond. The base plate 28 has, for example, a rigid rear flange or wall 45 in a standing state, welded and attached at (46) and (47). The assembly of the base plate 28 and the rear wall 45 is supported by the inclined plate 33 welded to the base plate and the rear wall at 48 and 49, respectively.

As shown in FIG. 3, the inclination of the inclined plate 33 is generally coincident with the orientation of the upper casting belt 9 in the vicinity so that the belt is bent around the upper input pulley roll 12 (arrow 51). . In other words, the inclined plate 33 is inclined so as to be usually parallel to an imaginary plate that is in a tangential direction to the closest portion of the belt 9 that is curved in a conical shape.

There is a triangular side wall (not shown) corresponding to the other side of the triangular side wall 53 (FIG. 4) and the supporting fixed structure 25, which maintains a gas-tight relationship with respect to the base plate, the rear wall and the inclined plate 33. A plenum chamber 54 is formed. A portion of the upper anchoring structure 25 is cut so that the plenum chamber 54 can be clearly seen, and there is a similar plenum chamber 54 in the lower anchoring structure 26. A socket or mounting hole 55 is provided in this support fixing structure 25 and attached to a bracket 56 (FIG. 3) mounted to an upstream end 57 of the main frame member of the lower carriage L. It can be seen that the tundish 4 is supported by the bars 58 extending from the bracket 56, and other support mounting devices 65 of the tundish may be installed.

The edges or ribs of the front edge (downstream) or the base plate 28 are cut off at an inclined position than the inclined plate 33, that is, at 59 to make the curved portion coincide with the movable mold surface 9.

As shown in FIG. 3, this inclined rib 59 is usually parallel to an imaginary plane tangential to the curved moving mold surface 9 of the tree.

In FIG. 3, it can be seen that the molten metal lies in the molten metal outlet 60 from the passage 20 of the nosepiece 7 and flows into the inlet E of the moving mold casting part C. The final gas space or cavity 8 is at the inlet E above the height of the molten metal in the moving mold C near the downstream end of the nosepiece 7.

At least one longitudinally extending gas supply passageway 19 formed along the side of the metal supply passageway 20 for directly introducing an inert gas under pressure into the cavity 8 to control the gas content. 6 is provided in the nose piece 7. This gas supply passage 19 is located at the central portion 40 of the refractory material of the nosepiece. The gas supply passage 19 is also located above the center line of the nosepiece 7 and the outlet 61 thereof is located near the upper end of the downstream end or end 62 of the nosepiece. The path through which the inert gas is supplied into the vertical inlet 63 connected to the gas supply passage 19 will be described later.

Since there is a gas supply discharge portion 61 on the nozzle tip 62, the gas flow is usually above the height of the molten metal outlet 60 (FIG. 3) from the supply passage 20. Therefore, inert gas enters the cavity 8 directly to fill this cavity and keep it slightly above atmospheric pressure. Even though the height of the molten metal in the inlet E has risen slightly above the height of FIG. 3, the raised portion of the outlet 61 of the gas supply passage is still above the metal and is caused by the molten metal in the inlet E. The alternating current is continuous with the controlled gas cavity 8 without being blocked. The gas supply outlet 61 is connected to a narrow groove or slot cut 61-1 extending horizontally into the end portion 62 of the fire resistant nosepiece 7 to minimize the fluctuation or turbulence formation of the molten metal. It helps to distribute the activating gas directly into the controlled gas cavity 8 at low speed. Therefore, the cavity 8 remains in a controlled state by continuously supplying inert gas through the one or more passages 20 at a pressure slightly higher than atmospheric pressure. Inert gas is continuously supplied to the cavity to prevent unwanted gases, in particular oxygen and water vapor (sulfur dioxide and carbon dioxide gas as air pollutant gases), from entering the cavity 8. The inert gas surrounds and purifies the cavity 8 and then pushes out the undesirable gas coming from the inlet E.

While casting the cavity 8 with inert gas while maintaining the pressure slightly above atmospheric pressure, a constant flow of inert gas is maintained through the gas supply passage 19. As mentioned in the introduction, between the upper and lower movable mold surfaces 9, 10 continuously moving in the direction indicated by the arrows 51 and 52 and the downstream end of the nosepiece 7, the number 22 (FIG. 3) is indicated. There is a small clearance gap above and below.

In the present casting machine, these moving mold surfaces 9 and 10 are made of casting belts. Some of the constant flow of inert gas flows upstream through the narrow clearance gap 22 described above. These clearance gaps 22 are less than or equal to 1.27 mm (0.050 inch), usually in the range of 0.25 mm (0.010 inch) to 0.5 mm (0.020 inch). Through the clearance gap 22 around the nosepiece 7, the inert gas effectively wipes out and purifies the atmospheric gas, including water vapor, and then drives it out of the inner mold surfaces 9 and 10 and pushes the gas out of the inlet E. .

The curved protection member 34 (FIG. 3) located between the inclined plate 33 and the movable mold surface forms a narrow passageway 66 to trap inert gas near these movable mold surfaces 9 and 10. As the moving mold surface is approached (direction 51 and 52) towards the inlet E, the action of the purification or the like on the above mentioned moving mold surface is promoted and extends over all of the mold surfaces 9, 10. do. The protective member 34 is circumferentially curved to fit close to each curved moving mold surface 9, 10, and is spaced below 6 mm (1/4 inch) and is about 3 mm (1 /) from the moving surface. 8 inches) is preferred. The front (downstream) edge of the curved protective member 34 is welded along the crest 64 (FIG. 4) of the base plate 28 near the upstream boundary of the cornered lip 59. The inert gas forms a relationship of adjacent flow, transfer and purification through the narrow passage 66 between the protective member 34 and the moving mold surfaces 9 and 10 adjacent thereto, and the moving mold surface is moved to the motions 51 to 52. Flow in a reverse direction, and then exit 36 from these passageways (FIG. 3).

The use of the protection member 34 has advantages such as reducing the consumption of inert gas, lengthening the time for exposing the moving mold surfaces 9 and 10 to the inert gas in order to discharge and purify atmospheric gas.

In order to further prevent the ingress of atmospheric gas into the inlet E, loose, soluble packing material 23 may be placed in this narrow passage 66 if desired. For example, suitable packing materials include Kaowool® ceramic insulators available from Babcook & Wilcox.

The packing can be made to be in light contact with the moving mold surface (9,10). Loose packing is located adjacent to the front edge of the lip inclined relative to the passage 66 and / or the nosepiece 7 as indicated by reference numeral 23. This loose packing can only be used by directly supplying an inert gas to the cavity 8 through the passage 19 (FIG. 6) in the nosepiece 7. It is certain that atmospheric gases such as oxygen and water vapor in the atmosphere are absorbed on the moving mold surfaces 9 and 10 and / or on the coating as described in US Pat. No. 3,871,905.

In addition, using moving mold surfaces 9 and 10 that are roughened, such as by grit-blasting or the like, oxygen and other gases in the atmosphere are trapped in elaborate dimples. In addition to adsorption, atmospheric gases may be trapped in the rough coating on the moving mold surfaces 9 and 10.

The adsorbed and / or collected gas is continuously introduced into the moving mold while adversely affecting the metal casting P except rubbing, diffusion, and movement on the surface of the moving mold 9 and 10 generated by the inert gas. Is moved.

The gas cavity is discharged by diffusion, rubbing and the like on the moving mold surfaces 9 and 10, and a part of the inert gas flows in a lateral direction to each side through each moving edge dam 17 and is controlled under pressure. Exhaust from section 8 cleans and transports atmospheric gases from these corner dams and prevents them from entering the inlet (E).

This inert gas is usually nitrogen, but may be argon, carbon dioxide or other gas that is hardly reactive with the special casting metal or alloy (1). An inert gas that can be usefully used when casting aluminum and alloys is pre-purified nitrogen, which is pumped by water sealing in a water pump, ie, a compressor, and is called ＂nitrogen＂ nitrogen, separately from oil pump nitrogen. This dry-pumped nitrogen is often sold to welders as a closed gas. Typical specifications (nitrogen closed gas) require less than 2 ppm oxygen and less than 6 ppm moisture.

The supply of inert gas through one or more passages 19 in a refractory nosepiece 7 with an outlet 61 directly connected into the controlled gas cavity 8 is referred to as direct injection. The good effect of directly injecting inert gas into the cavity 8 is that any oxygen, water vapor or other contaminating gas escaping from the mold and nozzle components during the enormous heat release from the molten metal outlet 60 of the molten metal is introduced. Can be released or diluted from (E).

In order to adequately control or remove the difficult atmospheric gases, the protective sections 34, which are curved as described above, on the moving mold surfaces 9 and 10, may be further than directly injecting inert gas into the cavity 8 itself. More is required to be covered or purged by the upstream flowing gas passage 66 near the moving mold surface.

In addition to the direct injection or as another method, the indirect gas injection of the inert gas may be performed. In FIG. 4, it can be seen that the gas flows into the cavity 68 in the triangular end wall 53 to supply the inert gas G into the plenum chamber 54. The feed port 68 is threaded to fit a gas supply pipeline or flexible conduit (not shown). From this plenum chamber 54 gas G is connected to a number of small lifespans in the lip 59 of the base plate 28 via a plurality of vertical passages 27-1 and transversely perforated header passages 27 The plate 28, connected to -3), flows as indicated by the arrow into each longitudinal perforation passage 27-2 extending horizontally downstream. The upstream end of the longitudinal drilling passage 27-2 is closed by the plug 67. Each end of the yellow perforated header passage 27-3 is closed by a plug 67.

If it is desired to supply a part of the inert gas G in the header passage 27-3 to the corner dam laterally, the holes 24-2 are drilled in each of the two plugs 67 described above. When casting to a thickness of 25 mm (1 inch), it is not necessary to install the side flow holes 24-2. Up to this thickness, the vertical axis surface 69 of the base 28 is formed at a flow rate and volume sufficient to allow sufficient pressure to be maintained in the gas cavity 8 so that atmospheric gas can enter the mold inlet E. The inert gas is moved in the axial direction with respect to the upstream and moving edge dam 17 which follows.

Inert gas exiting through the hole 24 of the inclined lip surface 59 is effectively applied to the moving mold surfaces 9 and 10 in the near range to quietly cover and purify the surface without noise. As shown in FIG. 5, when the direct feed gas passageway 19 is removed from the nosepiece 7, movement of the mold surfaces 9, 10 (51, 52) (FIG. 3) causes the inert gas to enter the cavity (8). Is moved to). A good alignment is to drill holes 24 of relatively small diameter, for example 1.6 mm (0.062 inch), in a horizontal column with a distance of 25 mm (1 inch) from center to center.

In continuous casting of aluminum and its alloys, which directly supply the `` dry-pumped '' nitrogen as inert gas (G) through the passages 27-1, 27-2, 27-3, and the holes 24, The flow rate successfully used was 0.28 m³ / h (10 ft³ / j) for casting 355 mm (14 inches) wide and 25 mm (1 inch) thick.

The 0.28 m³ / h is the volume of the inert gas at room temperature under atmospheric pressure. The corresponding calculation rate at which the inert gas was emitted from the hole 24 without noise was about 1.5 m / sec (5 ft / sec). It is considered that the corresponding pressure above the atmospheric pressure of the plenum chamber 54 becomes 0.07 kilopascals (0.011 lb / in² or less) or less.

Considering the ratio of the holes 24, there is a theory that this low flow rate is in the direction of turbulent laminar flow parameters as opposed to turbulence. Laminar flow is defined as non-turbulent flow, which is necessary to avoid loading air. Turbulences and vortices that appear to be associated with very high flow rates will be accompanied by air. This air entrainment is undesirable. Whatever the theory that laminar flow is dominant, the present invention can achieve very effective results in continuous casting of aluminum and its alloys, and is inclined almost horizontally or downwardly where oxidation or contamination of castings by atmospheric gases is a problem. It is also useful when the continuous casting of other metals in the continuous casting machine.

In order to reduce air collection, in order to reduce the likelihood of vortex formation when inert gas is discharged through the holes 24, such slots are formed in the transverse slots or grooves 24-1 formed in the inclined lip surface 59. ) Can also end.

As the inert gas is provided from the multi-holes 24, it gradually descends to a continuous portion of slight pressure at the tip between the moving mold surface 9, 10, the inclined lip 59 and the front downstream section of the nosepiece or Form the floor. The creation of such downward slow flow and pressure ridges can be facilitated by causing the holes 24 to end in the transverse slots or grooves 24-1. Gas from the pressure continuum flows through the clearance gap 22 into the controlled gas cavity 8. The residual amount of inert gas from the pressure continuity flows to the upper flow, thereby exiting to the discharge portion 36 through the passage 66 while performing a closed flow, transfer, and purification as described above.

The indirect method of injecting the inert gas quietly, that is, the method of making the pressure continuous portion near the nosepiece as described above, in a quiet manner without giving an audible disturbance to the inlet E of the moving mold, is an aluminum casting (P) and an aluminum alloy casting. (P) Aluminum alloys, which are preferable in the manufacture and which have a relatively high percentage of magnesium and which do not have a desired surface oxide, which is an undesired obstacle, and which have a satisfactory quality and properties on the surface and the interior thereof. More preferred when producing castings. It is advantageous to use both direct and indirect methods of inert gas injection simultaneously.

For example, if the molten metal in the e north of the moving mold is required to reach a height sufficient to at least cover the lower clearance gap 22 (3 degrees or 8 degrees) of the nosepiece, this lower clearance gap ( 22 is suitably enclosed and controlled by indirect injection of inert gas through the gas supply passages in the lower plenum chamber 54 and in the lower support structure 26.

Such a gas supply passage in the lower support structure 26 is similar to the passages shown in FIG. 4 in the upper support structure 25.

In this way, the lower clearance gap 22 (FIG. 3 or 8 degrees) is properly enclosed and controlled by the indirect method, while the upper clearance gap 22 is upstream through the upper narrow passage 66 and then the upper clearance. It is simultaneously controlled and encased by a "direct inflow" method upstream of the cavity 8 through the gap 22.

6 and 4, the inert gas emerges from the plenum chamber 54 which is slightly pressurized through the base plate 28 and one of the lands 43 in line with the inlet 63. By puncturing 70, it is fed into the inlet 63 leading to the passage 19.

If you want to make the inert gas unsteady in the vicinity of the nosepiece clamp stationary structures 25 and 26 more quiet, an additional outlet hole 72 is introduced into the plenum chamber 54 under pressure through the inclined plate 33. It may be perforated. When casting metals such as copper, steel and iron having high melting points, the moving mold surfaces 9 and 10 may or may not be mixed with graphite, for example UCON LB-300X, available from Union Carbide. It is covered with a suitable coating material of silicone oil type or alkyl oil type.

For such high melting metals, the nosepiece 7 with multiple reinsertable injection nozzles or tubes 21 in parallel is used in combination with a tundish as shown in FIGS. 7, 8 and 9 degrees. It is advantageous to. These reinsertable tubes 21 are inserted in the sphere 7 to work with the molten metal in the tundish 4 as most clearly seen in FIG. The tube 21 is made of high temperature refractory materials such as fused silicon dioxide, titanium dioxide, aluminum oxide or high temperature refractory nitride, all of which can be used in the form of commercial tubes.

The tube 21 is fitted in the parallel holes to the correctly operated nosepiece 7. In addition to the arrangement shown in FIG. 6, a number of parallel supply passages 63 and 19 are drilled in the nosepiece 7 for injecting inert gas G directly into the controlled gas cavity of FIG. This inert gas emerges from the plenum chamber 54 (see FIG. 4) pressurized through an appropriately installed supply passageway 70 in communication with each of the vertical passages 63. It is seen in the clearance gap 22 near the downstream end of the nosepiece 7.

In order to isolate the controlled gas hollow portion 8 from the atmospheric gas and prevent the ingress of gas, as described above, the loose flexible packing seal 23 is provided with the base plate 28 of the fixed structure 25, 26. It lies above and below the nosepiece 7 near the downstream tip of the ribs 59 (FIG. 5). The packing 23 may contact the movable mold surfaces 9 and 10.

In addition to the feed gas passageway 19, the inert gas draws the exit holes 72 (FIG. 4) in these ramps into a narrow passageway between the ramps 33 (Fig. 8) and the moving mold surfaces 9,10. It is supplied using.

Although FIG. 8 does not show the curved protective member 34 (FIG. 3 and 9), such sealing members can be used with the plurality of tube 21 metal supply lines shown in FIG. have. In addition, an indirect supply method of inert gas through the passages 27-1, 27-2, 27-3, 24, and 24-1 in the supporting fixed structures 25 and 26 is also used. do. As shown in Figs. 2, 3 and 8, the method for supplying the molten metal to the inlet E of the moving casting mold C is as described above, where the cavity 8 is located near the downstream end of the nosepiece 7. It is called "closed pool supply" because it is substantially closed by a small clearance gap 22 of.

인치(28mm)두께이상의 두꺼운 주조금속부분의 경우에는 적합하다. 불활성가스는 공급구(68)를 통하여 펀넬형의 플리넘실(54')안으로 공급된다. 이들 펀넬형 플리넘실(54')은 만곡밀폐구재(34), 베이스판(28)과 지지고정구조물(25,26)의 뒷벽(45)과 밀폐부재(34)와의 사이에 용접된 보호-지지벽판(74)에 의해 형성된다. 불활성가스는 만곡보호구재(34)의 하류선단근처의 출구(38)를 통하여 펀넬형 플리넘실(54')로부터 아래쪽으로 흘러간다.Another supply method of molten metal, referred to as open-pool supply, is shown in FIG. Although the open-pool supply method does not include a snugly installed nosepiece (7), sometimes in particular

Suitable for thick cast metal parts larger than 28 inches thick. The inert gas is supplied into the funnel-type plenum chamber 54 'through the supply port 68. These funnel-type plenum seals 54 'are protected-support welded between the curved sealing material 34, the base plate 28, and the rear wall 45 of the support fixing structures 25 and 26 and the sealing member 34. It is formed by the wall plate 74. The inert gas flows downward from the funnel-type plenum chamber 54 'through the outlet 38 near the downstream tip of the curved protective material 34.

A part of this inert gas flows in the form of wrapping into the inlet part E of the mobile casting mold C. As shown in FIG. Some of this inert gas is returned upstream through the narrow passage 66 in a state of washing away the surface of the moving casting mold, and exits from this passage at 36.

Although a method of supplying metal through a plurality of reinsertion tubes 21 of refractory material that withstands high temperatures (7, 8, 9 degrees) has been described as being used for metals or alloys having a high melting point, many such Tube feeding methods can also be used for low melting point metals and alloys, if necessary.

Any results from the methods and apparatus described above may be obtained by simultaneously using a preheated belt as described and claimed in US Pat. Nos. 3,937,270 and 4,002,197, or filed Oct. 22, 1980, assigned to the assignee of the present application. It will be improved with a double belt caster by preheating the belt with steam just before the inlet E of the moving mold C as described in the call.

The present invention improves its surface quality or properties in a relatively thin portion of continuous castings (P), especially alloys containing aluminum or high manganese alloys, which are cast in a substantially horizontal or downwardly inclined form, To improve the characteristics. In addition, the present invention also improves the quality of the thick continuous casting (P) cast in a horizontal or downward inclined type.

The term "beveled downward" as used here is an angle of 45 ° or less with respect to the horizontal, usually about 20 ° or less. Embodiments of an aluminum alloy that can be effectively cast continuously using the present invention are as follows.

Example 1

AA1100 with moving mold width up to 630 kg / h (1,400 lb / h) casting speed per 25 mm

Example 2

AA3003 with moving mold width up to 630 kg / h (1,400 lb / h) casting speed per 25 mm

Example 3

AA3105 with moving mold width of at least 450 kg / h (1,000 lb / h) casting speed per 25 mm

Example 4

AA7072 with moving mold width of at least 450 kg / h (1,000 lb / h) casting speed per 25 mm

Example 5

An alloy containing up to 2.8% magnesium by weight ratio of up to 517.5 kg / h (1,150 lb / h) casting speed per 25 mm

Example 6

Light alloy with moving molds with a casting speed of at least 450 kg / h (1,000 lb / h) per 25 mm width and containing 3.0% magnesium by weight

Example 7

An alloy containing 1.8% magnesium by weight, with a transfer mold width of at least 528.7 kg / h (1,175 lb / h) per 25 mm

Example 8

An alloy similar to AA3105 except that the moving mold has a casting speed of at least 450 kg / h (1,000 lb / h) per 25 mm and contains 0.8% manganese and 0.3% magnesium by weight

Example 9

The width of the moving mold is at least 450kg / h (1,000lb / h) of casting speed per 25mm, and the alloy contains 1.8% manganese, 0.3% silicon, 0.3% iron, and 0.52% manganese.

While certain preferred embodiments of the invention have been described in detail in the specification, these embodiments of the invention have been described for purposes of illustration. In order to apply the apparatus and method for supplying the inert gas to a specific casting machine, the above-described method and apparatus may be changed in detail without departing from the scope of the appended claims by those skilled in the art. The description is not intended to limit the scope of the invention.

Claims (34)

Molten metal 1 is introduced into a moving mold C in which the downstream direction is horizontal or inclined downward and the moving mold is defined between the surfaces 9 or 10 of the opposing cooled moving mold. In a method of continuously casting a metal product (P) having a relatively thin cross section directly from), a clearance gap (22) of 1.27 mm (0.050 inch) or less is provided between the metal supply device (7 or 21) and the surface of the movable mold. Inserting the metal supply device into the inlet (E), installing a metal supply passageway (20 or 21) therebetween extending downstream through the metal supply device, and moving the mold through the metal supply passage ( Supplying molten metal to the inlet (E) of C), installing at least one gas supply passageway (19 or 27) extending downstream toward the inlet (E) of the moving mold (C), being cast Vanity against metal Continuously casting a relatively thin cross-section of a metal product directly from the molten metal, characterized in that the step of supplying a reactive and inert inert gas (G) at a pressure slightly higher than atmospheric pressure through the gas supply passage (19 or 27). Way. 2. The metal supply passage (7 or 21) according to claim 1, wherein the metal supply device (7 or 21) includes a supply device made of refractory material, and the metal supply passage (20 or 21) and the gas supply path (19) to the supply device made of refractory material. Continuous casting of a metal product having a relatively thin cross section directly from the molten metal. 2. The metal supply device (7 or 21) according to claim 1, wherein the metal supply device (7 or 21) includes a supply device made of refractory material and a rigid support fixing structure (25 or 26) for supporting the fireproof material, and supplying the gas to the support fixing structure. A method of continuous casting of thin metal cross sections directly from molten metal, characterized by the provision of passages (19 or 27). 2. The rigid support structure of claim 1, wherein the rigid support structure rests above and below the refractory material and holds above and below the metal supply passageway 20 or 21 to maintain the intervening refractory material between the rigid support structure 25 or 26. A method of continuously casting a thin cross-section metal product directly from molten metal, characterized in that the gas supply passage (19 or 27) is provided in both the rigid support structure (25 or 26). 5. The height of the molten metal in the inlet E of the moving mold C downstream of any metal supply passageway 20 or 21 in order to form a cavity 8 at the inlet of the moving mold. One or more moving mold flat surfaces 9 are inert gas (G) in order to maintain the cavities and to cover the cavity with inert gas (G) to exclude the atmospheric gas from the cavity and to control the gas capacity of the cavity. Continuously transporting the metal product having a relatively thin cross section directly from the molten metal. The inert gas (G) is quietly directed to each moving mold surface (9 or 10) moving in the direction of each clearance gap (22) and the inlet (E) of the moving mold (C). This allows each moving mold surface 9 or 10 to carry the inert gas G through each clearance gap 22 to the inlet E of the moving mold C. A relatively thin cross-section directly from the molten metal, characterized by providing a gas supply passageway 19 or 27 extending downstream from the fixed structure 25 or 26 and terminating near each clearance gap 22. How to continuously cast the product. The inert gas (G), which is heavier than air, over the metal supply passage (20 or 21) according to claim 1 or 2, so that the inert gas tends to be on the metal supply device near the upper clearance gap (22). It is characterized in that it is quietly supplied to the inert gas lightly below the metal supply passage (20 or 21) so as to tend to ascend with respect to the metal supply apparatus near the lower clearance gap 22 to the inert gas. Continuous casting of metal products with relatively thin cross sections directly from molten metal. The method according to claim 1, wherein at least one small area without molten metal 1 for forming a cavity 8 downstream of the metal supply passageway 20 or 21 of the inlet E of the moving mold C. 8) is installed at the inlet E of the moving mold C, and the inert gas G is filled to control the gas capacity of the cavity by filling the cavity 8 with an inert gas at a pressure exceeding atmospheric pressure. A method of continuously casting a metal product having a relatively thin cross section directly from molten metal, characterized in that it is supplied directly from the gas supply passage (19 or 27) to the cavity. 9. The method of claim 2 or 8, further comprising the step of loosely closing each clearance gap 22 with a packing of flexible insulator 23 that is in light contact with each moving mold surface. Continuous casting of a metal product having a relatively thin cross section directly from the molten metal. 5. The movement according to claim 2, 3 or 4, in order to purify and remove the atmospheric gas from the surface of each movable mold with inert gas before the gas in the atmosphere flows into the movable mold C. Directing from the molten metal, characterized in that when the mold surface is approaching the inlet, an inert gas flows from the inlet of the moving mold so as to approach the moving mold surface 9 or 10 upstream. Continuous casting of metal products with relatively thin sections. 9. The inlet of the movable mold C according to claim 2 or 8, which extends in the downstream direction parallel to each other through the refractory material, and through which the molten metal 1 passes through all the metal supply passages 20 or 21. E) installing a plurality of metal supply passages (20 or 21) for supplying: and one or more gas supply passages located between the pair of adjacent metal supply passages and extending downstream in the refractory material (parallel to); 19), further comprising the step of positioning the continuous casting of a metal article having a relatively thin cross section directly from the molten metal. 10. The inert gas G according to claim 2 or 8 is provided with a plurality of gas supply passages 19 extending in a downstream direction in the refractory material between each pair of adjacent metal supply passages 20 or 21. And simultaneously feeding all the gas supply passages through the gas supply passages to the inlet of the moving mold at a higher pressure. 9. The metal supply passage according to claim 2 or 8, for introducing an inert gas directly into the controlled gas cavity (8) above the height of the molten metal (1) of the inlet (E) of the moving mold (C). A method of continuously casting a metal product having a relatively thin cross section directly from molten metal, characterized in that it further comprises installing an outlet (61) of the gas supply passageway (19) above the height of the outlet of the (20). 8. The molten metal according to claim 7, characterized in that dry purified argon gas (G) is supplied above the metal supply passage (20 or 21) and dry purified nitrogen gas (G) is supplied below the metal supply passage. Continuous casting of metal products with relatively thin direct sections. 9. The method according to claim 2 or 8, wherein the groove 61-1 extends horizontally and horizontally with respect to the metal supply direction to form a groove in the discharge end of the refractory material: and the turbulence of the molten metal 1 Flowing inert gas (G) from said gas supply passage (19) to said groove for dispensing said inert gas (G) without generating it. How to continuously cast the product. The solid support fixture (25 or 26) according to claim 3 or 4, wherein inert gas (G) is directly supplied to the inlet (E) of the moving mold (C) through the gas supply passage (19) in the refractory material. A method of continuously casting a metal product having a relatively thin cross section directly from a molten metal, characterized by quietly supplying an inert gas through at least one gas supply passageway (27). Molten metal is introduced into the inlet E of the moving mold C in which the downstream direction is horizontal or inclined downward, and is defined between the surfaces 9 or 10 of the cooled moving mold which the moving mold C faces. A device for carrying out the method of claim 1, wherein the metal product P is continuously cast directly from the molten metal 1, the cross section being relatively thin in cross section, wherein the metal supply device 7 or 21 and the movable mold surface 9, 10) a pressure slightly exceeding the atmospheric pressure of the inert gas (G) and the metal supply device (7 or 21) inserted into the inlet (E) while having a clearance gap 22 of 1.27 mm (0.050 inch) or less. It consists of a device for supplying through the gas supply passage (19 or 27), the metal supply device (7 or 21) and one or more metal supply passage (20 or 21) extending through the metal supply in the downstream direction Downstream extending downstream of the inlet of the moving mold Or more gases, and has a feed passage (19 or 27), the inert gas (G) is inert and apparatus for directly cross section continuous to a relatively thin metal product casting from the molten metal, characterized in that non-reactive with respect to the cast metal. 18. The device according to claim 17, wherein the metal supply device (7) comprises a supply device of refractory material, wherein both the metal supply path (20 or 21) and the gas supply path (19) are in the supply device of refractory material. An apparatus for continuously casting a metal product having a relatively thin cross section directly from a molten metal. 18. The gas supply passage (27) according to claim 17, wherein the metal supply device (7 or 21) comprises a supply device made of refractory material and a rigid support fixing structure (25 or 26) for supporting the fireproof material. A device for continuous casting of relatively thin cross-sections directly from molten metal, characterized in being in said rigid support structure (25 or 26). 18. The method according to claim 17, further comprising a rigid support fixing structure (25 or 26) above and below the refractory material for holding the fire resistant material sandwiched between the support fixing structures (25 or 26). 21. An apparatus for continuous casting of a metal product having a relatively thin cross section directly from molten metal, characterized in that gas supply passages (27) are provided in both of the upper and lower support fixing structures. 21. The method according to claim 19 or 20, wherein the height of the molten metal (1) in the inlet (E) of the moving mold is downstream of the metal supply passage (20 or 21) to form a cavity (8) at the inlet of the moving mold. At least one moving mold surface 9, 10 to cover the cavity with an inert gas G, thereby excluding air from the cavity 8 and controlling the gas capacity of the cavity. Apparatus for continuously casting a metal product having a relatively thin cross section directly from the molten metal, characterized by conveying this inert gas into the cavity (8). 21. The method according to claim 20, wherein the inert gas (G) is quietly directed to each moving mold surface (9 or 10) moving in the direction of the clearance gap (22) and the inlet (E) of the moving mold (C), respectively. Gas supply passages 27 downstream of the respective fixed structure to allow each moving mold surface to carry inert gas through each clearance gap 22 to the inlet E of the moving mold. A method of continuously casting a metal product having a relatively thin cross-section directly from the molten metal, which extends and terminates near each clearance gap. 23. The metal supply passage (20) of claim 19, 20 or 22, wherein the inert gas (G), which is heavier than air, tends to be in an inert gas above the metal supply device near the upper clearance gap (22). Or 21) a device for quietly supplying inert gas and a device for quietly supplying an inert gas lighter than air below the metal supply passage so as to tend to ascend with respect to the metal supply device near the lower clearance gap 22 to the inert gas. An apparatus for continuously casting a metal product having a relatively thin cross section directly from the molten metal. The one or more small areas (8) without molten metal as claimed in claim 18, for forming the cavity (8) downstream of the metal supply passageway (20 or 21) at the inlet (E) of the moving mold (C). An inert gas is provided from the gas supply passageway 19 or 27 installed in the movable mold inlet to fill the cavity with an inert gas at a pressure exceeding atmospheric pressure, thereby controlling the gas capacity of the cavity. (8) A method of continuously casting a metal product having a relatively thin cross section directly from the molten metal, comprising a device for feeding directly to (8). 25. A flexible insulator (23) according to claim 18 or 24, comprising a flexible insulator (23) in light contact with each moving mold surface (9 or 10) for loosely packing each of said clearance gaps (22). Apparatus for continuous casting of metal products having a relatively thin section directly from molten metal. The method according to claim 18, 19, 20, 22, or 24, wherein the atmospheric gas is purified from each moving mold surface with an inert gas (G) before the atmospheric gas flows into the moving mold. When the surface of the moving mold is approaching the inlet of the moving mold, the inert gas flows out of the inlet E of the moving mold so that the surface of the moving mold 9 or 10 is extremely close to the opposite direction. A method of continuously casting a metal product having a relatively thin cross section directly from molten metal, characterized by providing a curved protective member (34) very close to each moving mold surface in order to flow upstream of the (reverse direction). The movable mold (C) according to claim 18 or 24, wherein a plurality of metal supply passages (20 or 21) extending in the downstream direction parallel to each other through the refractory material and molten metal through all of the metal supply passages. A device (4) for supplying to the inlet (E) of the engine and one or more gas supply passages (19) located between and adjacent to a pair of adjacent metal supply passages and extending downstream in the refractory material; A method of continuously casting a metal product having a relatively thin cross section directly from a molten metal. The gas supply passage (19) according to claim 27, comprising a plurality of gas supply passageways (19) between each pair of adjacent metal supply passages (20 or 21) and extending downstream in the refractory, and an inert gas (G) at a pressure above atmospheric pressure. ) Is a device for continuously casting a metal product having a relatively thin cross section directly from the molten metal, characterized in that the device for simultaneously supplying the same through the gas supply passage to the inlet (E) of the moving mold. 29. The controlled gas cavity 8 according to claim 18, 24 or 28, wherein the inert gas G is above the height of the molten metal 1 of the inlet E of the moving mold C. For direct introduction, continuous casting of a metal product having a relatively thin cross section directly from molten metal, characterized in that the height of the outlet 61 of the gas supply passage is located above the height of the outlet of the metal supply passage 20. Device. 29. The groove (61-1) according to claim 18, 24 or 28, wherein the groove (61-1) is horizontally transverse to the metal supply direction at the discharge end of the refractory material, and the gas supply passage (19) is a turbulent flow of molten metal. A device for continuous casting of a relatively thin cross-section directly from the molten metal, characterized in that it is connected to the groove (61-1) for distributing inert gas without causing. 29. An apparatus according to claim 18, 19, 20, 22, 24 or 28, which directly supplies an inert gas through a gas supply passageway 19 in a refractory material to an inlet of a moving mold. And at the same time a device for quietly supplying an inert gas through one or more of said gas supply passages 27 in a rigid supportive fixed structure 25 or 26. Molding device. 27. The method according to claim 26, wherein the inert gas discharged through the clearance gap 22 flows upstream in the reverse direction to the moving mold surface through the narrow passage 66, thereby allowing the gas in the atmosphere to flow into the moving mold ( A downstream portion of each protection member is located in the vicinity of each clearance gap 22 to purify and exclude the gas in the atmosphere from each of the moving mold surfaces 9 or 10 before entering into C). Apparatus for continuously casting a metal product having a relatively thin cross section directly from the molten metal. 24. The metal product having a relatively thin cross section directly from the molten metal according to claim 23, wherein the inert gas G is refined argon supplied above the metal supply passage, and refined nitrogen is supplied below the metal supply passage. Apparatus for continuous casting. The method of claim 17, 18, 19, 22, 24, 28, 32, or 33, wherein the movable mold cavity is also defined by two moving edge dams (17). And a device (24-2) for supplying an inert gas (G) to each of the moving edge dams (17) in the vicinity of the moving mold (C) is relatively thin in cross section directly from the molten metal. Apparatus for continuous casting of metal products.

Images