JPS5942164A - Method and device for feeding and continuously casting molten 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

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for cooling cast metal from molten metal introduced into the casting region of a moving mold between two spaced apart moving cooling surfaces that cools the cast metal through a semi-enclosed nozzle member or nosepiece. The present invention relates to a method and apparatus for supplying molten metal and continuously casting metal strips, sheets, slabs, plates, bars or billets directly and continuously.

The present invention is directed to directing the molten metal through a semi-enclosed nozzle member between opposing portions of two mobile molds having a surface forming a mold area and being water or liquid cooled. The structure and operation of the casting machine that feeds the mold or 81-containing area will be specifically described. The moving mold of the illustrative example is a flexible band or belt that acts as a cooling surface and surrounds or confines the molten metal introduced into the moving mold between them;
The molten metal gradually moves and solidifies into a tangible object, or product. The product is strip #/”-t1
A thick plate, flat plate, bar or piece of steel, hereinafter referred to as "
These products are called "cast products" or "cast products." Continuous casting machines that employ such flexible bands or belts and are often referred to as twin-belt casters are manufactured by Lutpay, the No.
e Hazelett Strip-Casting C
organization ) Developed for many years by VC,
Manufactured. If information regarding various aspects of such a casting machine is desired, it may be obtained from the above-identified company, the assignee of the present invention.

First, when #4 molten metal is fed or filled into a moving mold of a generally horizontal or downwardly tilted continuous caster, the casting is of superior quality and has surface properties and characteristics suitable for commercial use. Critical elements for metals are to avoid sudden changes in the velocity of the molten metal being introduced, to avoid agitation of the molten metal, to the atmosphere or to other reactive substances that are reactive with the molten metal. and to provide desirable interaction between the moving mold surfaces and the metal defined by those surfaces.

The molten metal handling and feeding equipment that conveys the molten metal to be cast from the melting furnace or stationary furnace to the mold area of the casting machine is generally designed to avoid obstructions and limit exposure of the molten metal to the free atmosphere. , usually accomplished by under-injecting at each transfer. Therefore, the molten metal is not poured over an open mouth, but instead is poured well below the surface of the molten metal within the vessel, leaving behind oxygen and many extraneous substances. This technique of lower injection further
The molten metal is transferred or introduced into an adjacent vessel from below the surface of the molten metal in a manner that reduces agitation and avoids contact with atmospheric or oxygen-containing substances. These compositions and technologies generally include fried lead, zinc, aluminum, and steel.

It is used for handling iron and steel, alloys of these metals, and other metals as well. Failure to implement such configurations and techniques would result in the unrestricted generation of oxygen, which would adversely affect the metallurgical properties of the cast end and also cause problems with the molten metal feeding equipment and the casting. . For these metal containers, relatively small amounts of oxygen can cause such problems. Hydrogen is water in the atmosphere,
Hydrogen dissociates into its molecules on contact with hot molten metal or on contact with combustion gases that produce hydrogen, and becomes infused into the cast metal. Even a small degree of ambiguity causes undesirable porosity. Even nitrogen is inconvenient under certain conditions. The problem of oxygen in the troughs, tanks, and tundishes is generally solved by downward injection in conjunction with reducing the atmosphere hitting the surface of the bath metal. This atmospheric relief is obtained by passing a combustion flame of oxygen-depleted oil or gas which is supplied to the gutter or the like.

In the case of aluminum, the protective oxygen film is designed to be applied gently to the surface of the open container with minimal agitation. Atmospheric mitigation in this case is not required in preparation for aluminum transfer by downward injection.

The entrapment of oxygen or other impurities is less likely to occur in conventional vertical continuous casting methods that use rigid molds that are open at the top and bottom. In this vertical casting process 2, the mold is generally poured by downward pouring and at a relatively slow rate.

Oxygen and other impurities have time to float to the top, so they remain in the top oxygen layer that forms there or are frozen in the center or core region of the relatively large cross-section ingot. It's across the street.

In the case of vertical casting of large cross-section products, it is likely that the VC will not be substantially horizontal or tilted downwards so that trapped oxygen or other impurities will not harm or tolerate the cast product. When casting with an FC continuous casting machine, the situation is completely different and unique.

If the mold area is elongated, such as in a twin-belt caster, for example, the continuously moving mold surface is normally operated at relatively high linear speeds. Here, the problem of entrapment of oxygen and other impurities becomes more of an issue and makes casting products more difficult to assess.

When casting relatively thin cross-sections in near-horizontal conditions, downward injection techniques for introducing molten metal into the moving mold region of a continuous caster are usually impractical and impractical;
This is because there is insufficient vertical clearance between the mold surfaces. When casting such relatively thin cross-sections, molten metal is typically introduced through a semi-closed nozzle member. As a practical matter, this nozzle member is placed at a slight distance from the moving mold surface near the entrance of the mold region to compensate for the inevitable changes and fluctuations in the entrance of a continuously moving mold. This spacing of the nozzle member from the surface of the continuously moving mold involves the formation and shaping of refractory materials having physical, chemical and thermal properties suitable for the requirements of molten metal handling. It is necessary to take into account dimensional tolerances. Refractory materials suitable for this demanding purpose are difficult to create and maintain in shape within narrow and consistent tolerances.

Therefore, the fit between the nozzle member supplying molten metal and the surface of the continuously moving mold is relatively loose and the new nozzle ′
0,2 tough 7LTrLC0,0 which is customary for the member
10 inches). However, this gap tends to widen due to wear, especially at the top of the nozzle member. If the operator of the moving mold were to continue filling the mold area with molten metal against the nozzle member, it could be avoided that much of the molten metal around the sealing surface of the nozzle member would periodically escape. It's difficult. In other words, it is usually impractical to attempt to keep the mold area filled with molten metal against the nozzle member. In fact, a 0.3 mm (0,020 inch) gap around the nozzle member will generally leak any pure metal with low surface tension, and metals such as 'f:' will solidify quickly. , or untimely: to congeal,
This causes an undesirable pushing action on the nozzle member, resulting in destruction of the nozzle member.

Therefore, it is usually necessary to avoid filling the mold area to avoid molten metal pouring into the nozzle member. Such attempted molten metal filling is quite good for aluminum due to its high surface tension which tends to inhibit leakage through the gasket. However, even for aluminum, a "head" of molten metal that is significantly higher than the upper mold region should be avoided, since the resultant pressure of the molten aluminum in the gap near the nozzle member is due to the surface tension This is because all keys are locked, causing leaks. Therefore, even for aluminum units, operators often maintain the level of molten metal in the mold area to be no higher than the lower front edge of the entire nozzle member, so that a gas cavity in the mold exists. I come to do it.

In fact, during successive casting of this aluminum, all the nozzle elements fitted in a hermetically sealed manner ensure that the molten metal is slightly higher than at any point in the mold area, i.e. at the location of the gas cavities that have not yet been removed. Despite being a small head of metal pressure higher than that, a small gas cavity persists. This phenomenon of undesired residual gas cavities results in part from the drag of the moving mold surface on the surface of the molten metal, caused in part by the power of the feed and increased by surface tension.

Therefore, as a result of deliberate manipulation to reduce the chance of leakage of molten metal occurring through the gap adjacent to the nozzle member, or even without intention to do so, or such power drag phenomenon As a result, gas spaces or cavities usually exist within the mold region. The cavity is located adjacent the forward end of the nozzle member in an upper portion of the mold region upstream from the level of the molten metal.

Approximately 0.0 mm near the surface of the continuously moving mold. ,! ; mrrt
Due to the surface of the nozzle member being within (0,02θ I/TE), the operator cannot visually ascertain the physical condition or level of molten metal in the mold area at any time. Thus, the operator cannot rely on visual observation to control the level of molten metal or the dimensions of the aforementioned cavities. A new method and apparatus that overcomes the difficulty of visual operator inability to control injection levels is disclosed in U.S. Pat. '? , 2/, Otsu No. 77, and these disclosures are incorporated herein by reference. The methods and apparatus of these patents are conveniently applied to twin belt casters, where full visibility of the molten metal level is not required. They have proven to be of practical use for the control of commercial double-belt casting machines. Thus, the use of a suitably matched nozzle member provides a practical method for introducing metal into the casting region while maintaining a controlled cavity in the upper portion of the mold region between the nozzle member and the molten metal. became.

Fused aluminum and aluminum alloys have particularly high reactivity. It can be combined with other metals, gases and refractory materials. For example, aluminum alloys in the bath molten state during continuous casting undergo chaotic reactions with, or are attacked by, atmospheric oxygen, water vapor, and are contaminated by atmospheric gas contamination. Contact with the disordered atmosphere in the continuous wetting of the aluminum alloy enclosing the magnesium causes reactions that in turn create oxygen spots or stripes on the surface of the casting and reduce the fluidity of this alloy in the molten state.

The problem of free oxidation and reaction of molten metal is compounded in one way when relatively thin sections are continuously cast.

Firstly, as already pointed out, there is the problem of lack of clearance for the equipment for downward injection into the mold area of all continuous movement of metal; The surface to R ratio is increased by such a thin cross section. Since oxidation is generally a surface or interfacial reaction, the formation of oxygen in such relatively thin continuous cast sections constitutes a greater relative proportion of the product when contrasted with thicker sections.

Also, while it is practical to extract oxygen from the surface of the cast product for such thick sections, this is not the case for relatively thin sections.

Although some of the above description is from the perspective of a twin-belt caster, the same problem may be encountered with other types of continuous casters that cast relatively thin cross-sections in a horizontal or downwardly inclined position. It also happens.

The “relatively thin cross section” used here is 6 mm (777
Inch) to J/mm (,2 inches), preferably Otsu'mm (//'A inch)
It is an object of the present invention to provide superior surface properties and characteristics by continuous casting machines with molten metal feeding and settling and horizontal or downwardly inclined moving mold areas. An object of the present invention is to provide a method and apparatus for continuous casting of metal products with excellent internal structure and properties.

The molten metal is placed at a distance of /, 27 mm (0,
a semi-enclosed nozzle member precisely mounted on the surface of the moving mold, upstream or inlet end of the continuously moving mold region;
At the same time, inert gas is directed onto the moving mold surfaces and the introduced metal to protect and cover all molten metal surfaces within the mold cavity from oxygen and other harmful atmospheric gases. Advantageously covering the supply molten metal and a controlled cavity at the upper end of the mold area and the moving mold surface allows inert gas to flow into the mold through a semi-enclosed nozzle member, or This is accomplished by passing the gap fiz into the mold cavity and around the nozzle member.

Such inert gas is circulated to clean the moving mold surface from undesirable entrained or adhered gases associated with the mold surface as it approaches the nozzle member prior to entering the mold region.

One embodiment of the present invention is inserted into the upstream end of the continuously moving mold region and from the continuously moving mold surface.
molten metal is supplied through at least one flow path 7 in a nozzle member of refractory material having a play gap f in the range of less than rms (0,060 inches), and the nozzle member is connected to a rigid upper and lower support mounting structure. It sticks to things and is inert.
At least seven said installations supply said inert gas through at least one channel in the structure and gently introduce said inert gas into at least one of the narrow play gaps around the inserted nozzle member, thereby allowing said inert gas to flow in. The upper end of the molten metal and moving mold area is completely covered with a controlled cavity.

Another embodiment of the present invention provides for a nozzle member of a combined refractory material to be inserted into a continuously moving mold region and/or to a continuous moving mold surface having a play gap of less than 27 mm (0,050 inches). Supplying molten metal through at least one flow path and introducing casting metal through at least one flow path of at least seven inserted suspended nozzle members, while simultaneously discharging the metal into a controlled cavity at the inlet end of the mold region. In order to directly introduce the active gas and improve the quality and characteristics of continuously cast metal products, the inert gas is directly introduced through at least one additional channel of the at least one nozzle member.

In another embodiment of the present invention, in the configuration described in the above two sections, at least one flow path of at least one nozzle member support structure is entirely passed through an inert gas flow path. and at the same time supplying an inert gas through the flow path of at least one nozzle member itself.

Another embodiment of the present invention provides for entraining the entire moving mold surface with an inert gas and carrying or entering the inlet of the moving mold region through a play gap beside the nozzle member. a shielding member or shielding structure disposed relatively close to at least one of the moving mold surfaces that is moving in the direction of the inlet of the moving mold region, and an inert gas formed in close proximity to the moving mold surface; It is to feed into the groove.

Still other embodiments of the present invention provide for cleaning mold surfaces to remove atmospheric forces and/or contaminant gases and/or water vapor carried on the moving mold surface to remove relatively thin cross-sections. In order to improve the quality and characteristics of continuous casting metal products, casting relatively thin metal cross sections is relatively close to at least one of the moving mold surfaces moving in the direction of the moving mold area population; The shielding member or shielding structure is positioned and an inert gas is allowed to flow into the groove formed adjacent to the moving mold surface.

Yet another embodiment of the present invention provides for casting relatively thin metal cross sections by supplying an inert gas forward to the moving mold surfaces as the moving molds move toward each other and toward the inlet of the moving mold. In order to do this, the inert gas is supplied through channels and/or chambers associated with the support structure of the metal supply nozzle member. Additionally, such channels and/or chambers may interfere with the movement of moving edge dams employed in twin-belt casters as these moving edge dams approach the moving mold. The inert material may have a lateral exit facing the direction of each moving edge dam member for infiltration and encampment.

Among the many features of the embodiments described above, an inert gas is introduced into a cavity in a generally horizontal or downwardly inclined position in the upstream portion of a moving mold for casting relatively thin metal cross-sections. Direct injection brings the pressure of the inert gas within the cavity to slightly above atmospheric pressure, so that the cavity itself is covered and the inert gas is transferred to the mold surface and inserted into the heated metal supply nozzle. This results from the fact that the clearance between the parts and the gear knob allows the slag to be removed, cleaned and allowed to flow outwards while bathing. Further, while the molten metal is being supplied through the at least one passageway of the nozzle member, an inert gas is introduced through the at least one passageway within the refractory material of the nozzle member. The outlet of the gas flow path is an inert f7. may be raised above the centerline of the nozzle member to ensure that the molten metal flows into the upstream portion of the moving mold above the level of the molten metal.

Among the many features of the embodiments described above, by directing an inert gas toward at least one of the moving mold surfaces as the moving mold surface is moving in the direction of the inlet of the moving mold, the surface of the moving mold is horizontally moved. Alternatively, it results from the fact that an inert gas can be directly introduced into the cavity existing upstream of the moving mold in which the downwardly inclined and relatively thin metal cross-section is entirely cast. The inert gas supports the refractory nozzle member that supplies the molten metal. In order to effectively apply the active gas to the surface of the moving mold, the inert gas is gently introduced through the channels and/or chambers in the structure, and the inert gas is applied to the surface of the moving mold. The at least one shielding member may be 1% conformal to the relatively proximate configuration of the moving mold surface for diffusing and cleaning purposes.

Another embodiment of the invention is an apparatus in which the inert force is introduced indirectly into the mold through a play ring around the nozzle member.
The i aspect can be explained below. This embodiment simultaneously:
Two types and two concentrations of inert gas are advantageously used.

In particular, an inert gas heavier than air should be supplied above the nozzle member. This gas tends to remain on the nozzle member and its upper supporting member rather than dissipate. At the same time, an inert gas lighter than air is supplied under the nozzle member. Rather than dissipate, this gas tends to rise and remain against the nozzle member and its lower support structure. By way of example, the heavier-than-air gas used at the top is Alkon, which is approximately 3J% heavier than air. A suitable lighter-than-air gas needed in the bottom is a gas that is about 3 inches lighter than air.

The present invention, as well as its objects, embodiments, advantages and features, will be more clearly understood upon consideration of the following description in conjunction with the accompanying drawings. In the accompanying drawings, members of class 1 and above are given the same reference numerals throughout the various drawings. The directional arrow drawn in IJ mi indicates the direction of movement of the metal fed to the mold and cast within the range from upstream to downstream, and the metal fed to the upstream end of the continuous moving mold. show. The drawings are not to scale, emphasis instead being placed upon detailed description of the invention.

A first embodiment of a continuous metal casting machine that advantageously uses the present invention is
As shown in FIGS. In this casting machine, molten metal l is supplied by a feeding device, which is a pouring box, a ladle or a trough 2, and flows down from a pouring spout 3 in under pouring relation to a tung pusher 4. The tank 4 is lined with a suitable refractory material 31. To make the drawings clearer,
The unit 4 is shown in FIG. 1 retracted into the fixture from the entrance of the moving mold. The flow rate from the gutter 2 to the tank 4 is controlled by a tapered string 1 (not shown) provided at the lower end of the control rod 5. The molten metal 1 from the tunnel 4 is passed through a nozzle or nosepiece 7 of refractory material or through a tube 21.
It is supplied to the inlet E of the moving mold or pouring area C. The embankment E is at the upstream end of a casting zone C, which is formed between substantially parallel surfaces separated by an upper and lower flexible endless casting bell. Ru. Cast belts are usually made from low carbon cold rolled steel strip with uniform properties. And they are in G contact by TiG welding. Cast T-belts are typically grid-crusted to roughen the surface facing the molten metal, followed by rolling and coating.

The casting bell) 9.10 is generally supported and driven by upper and lower calipers indicated by U and L&. Both carriers are provided on the machine frame 11. Each carriage has one king roll or roller that directly supports, drives and steers the fishing belt. These girders have respective upper and lower inlets or upstream pulleys 12, 13 and upper and lower outlets or downstream pulleys 14,15.

The casting belt 9.10 has a plurality of support rollers 16 with 2-in.
(FIG. 2), so that the casting surfaces of the mutually opposing belts are maintained in a preselected relationship throughout the casting area C.

These finned support rollers 16 are preferably of the type disclosed in U.S. Pat. No. 3,7,130.

Metal retaining endless edge dams 17, sometimes referred to as moving edge dams, are placed on both sides of the casting area to confine the molten metal. The side dams 17 (only one of which is shown in FIG. 1) are guided at the entrance or upstream end of the casting machine by a partially shown guide member 35, which guide member 35
For example, the above US clock or US patent No.≠, is0. ”
As shown in No. yii, there is a rear carriage LK.

During the casting operation, the single casting belts 9 and 10 are used, for example, as described in the above-mentioned US Pat. /1.7, the drive mechanism IEI as described in No. 30 can be driven at the same linear velocity. As shown in FIG. 2, the upper and lower carriages U and Ljd are inclined downwardly in the downstream direction, so that the komagome region C of the moving mold between the komagome belts is inclined at an angle 1iA with respect to the horizontal. This downward slope A facilitates the flow of the bath molten metal into the inlet E of the casting region C. At this time, the oblique angle A was
It is usually 20° or less and can be adjusted by the jacking mechanism 50. A convenient angle for aluminum and its alloys is in the range of 0 to 0.

A stream of very hot heat is applied from the nozzle header and withdrawn from each casting belt by a fast moving layer of liquid coolant that moves along the cooling surfaces on the backside of each of the upper and lower bells (9.10). be done.

The liquid coolant is added at a rapid rate and the rapidly flowing layer is formed in the above-mentioned patent No. 3. /1,7. Ryo No. 30 and U.S. Patent No. 3, O'l
-7, Coolants that are currently maintained in a manner such as that shown in No. 6 are corrosion-inhibiting agents in the temperature range of 2/°C (70°F) to 32°C (70'F). It's water with medicine in it.

After the cast product P has hardened 9 at least on its outer surface and left the casting machine, it is guided and conveyed away by a roll conveyor (not shown) V.

The nosepiece is made of marinite or other suitable refractory material, for example to accommodate low melting point metals such as lead, zinc or aluminum. This nose piece 7 is
It is made of a single piece of refractory material as shown in FIGS. 2 and 4. Alternatively, the nosepiece may be assembled from multiple monoliths of refractory material.The term "nosepiece" used in its entirety refers to
An integral part or an assembly of multiple integral parts is considered important.

To support this refractory nosepiece 7, there are rigid upper and lower support structures 25 and 26, respectively, which are designed to be sandwiched between the nosepiece clamping structures 25 and 26. Positioned by clasps at the top and bottom of the nosepiece.

As shown in FIGS. 5 and 3, the refractory nosepiece 7 includes at least seven metal feed channels 20. In this embodiment, there are two such journeys 20 with a central bulkhead 40 between them. It is provided with a nosepiece and extends vertically in the downstream direction. These metal supply channels 20 have a rectangular cross section I[
Has IT. They are relatively wide and low height suitable for casting relatively thin pieces of metal. Transfers the feed bath molten metal smoothly and quietly without undesirable turbulence in casting area C (
2 and 3), the downstream ends of these metal supply channels 20 are shown gradually widening laterally with respect to the downstream direction, as indicated at 41 (Figs. 5 and 3). Third
figure).

As can be seen in FIG. 3, the upper and lower support structures are similar in structure to the hollow structure except that the shape of the lower support structure 26 is reversed in order to tighten the fireproof nosepiece 7 of the support structures 25 and 26. It is. These support structures 25 and 26 are rigid, for example made of steel.

Figure ≠ shows an enlarged view of 25 structures for upper support tightening. This structure includes a rigid base plate 28 and its fastening 42 is a rigid fastening engagement with the refractory nozzle member 7? It has shallow lands 43 and grooves extending laterally for securing. The upright rigid rear 7 lunges or walls 45 are e.g. 46 and 47
It is attached to the substrate 28 by welding. The assembly of the substrate 28 and the rear wall 45 is
Swash plate 331/ welded to 5 and 48 and 49 respectively
il: Therefore, it is reinforced. As shown in FIG. 3, the slope of this swash plate 33 approximately corresponds to the shape of the upper cast-in belt 9 nearby, and the belt 9 is curved to form an upper cam log-IJ.
The wheel 12 moves around (arrow 51). In other words, this swash plate 33 is inclined approximately parallel to the imaginary plane of the X'' warp to the nearest 1'' rest of the cylindrical VC# curved belt 9.

Triangular side wall 53 (Figure ≠) is the base plate, rear wall and swash plate 33
The support fastenings are hermetically identified on the other side of the structure 25 and have corresponding triangular side walls (not shown), whereby the ledge forms a shed-like plenum chamber 54. In order to clearly show that this differential loss is a shed-shaped lunum 454, the tightening is shown by cutting out a part of the phosphor nose 25, and the lower tightening is similar to the structure 26. There are 54 Runum Solstice.

The opening of the receiver, that is, the mounting hole 55 is connected to the mounting bracket 56 (i
3), this fastening is provided on the structure 25, the mounting bracket 56 of which is attached to the upstream end 57 of the main frame member of the lower carriage L. The tongue pusher 4 is shown supported on a pawl member 58 extending from a bracket 56, and other support attachments for the tongue pusher 4 are also provided at device 65.

The front (lower tN,) end or affected area of the substrate 28 is 5
9 is chamfered with a smaller slope than the swash plate 33. As can be seen in FIG. 3, this slanted lesion 59 is approximately parallel to an imaginary plane that is curved and tangential to the moving mold surface 9.

FIG. 3 shows the molten metal exiting the channel 20 of the nosepiece 7 and entering at 60 the inlet region ε of the casting region C of the moving mold.

The resulting nitrogen gap or cavity 8 exists in the inlet region EK above the level of molten metal in the transfer casting region C adjacent to the downstream end of the nose shaft.

The nosepiece 7 has at least seven longitudinal extensions running along the sides of the metal feed channel 20 for introducing pressurized inert gas directly into the gas cavity 8 and controlling the volume of said gas therein. A gas supply flow path 19 (FIG. 3) is provided. This gas flow channel 19 is the central part 4o of the refractory material of the nose bead.
Located in

Konofu R
) is located at a level above the line (7), and its outlet 61 is located at the "F" flow end or terminal end 62 of the nosepiece.
near the top of the . The manner in which inert is supplied to the vertical port 63 communicating with the skegas supply channel 19 will be described later.

By providing the entire gas supply outlet 61 at a high position of the nostle end portion 62, the force m is generally upstream of the level of the #resistant metal outflow 60 (FIG. 3) from the supply channel 20. . The inert gas thus enters the cavity 8 directly and maintains a pressure slightly higher than the total atmospheric pressure in this cavity filled with inert gas. Even if the level of molten metal in population area E may temporarily and inadvertently rise slightly above the level shown in FIG. Since the bulk supply outlet 61 is placed upstream of the molten metal, the gas supply outlet 61 is always unobstructed by the molten metal in the inlet area E, and therefore the gas control cavity 8
We communicate constantly. The gas supply outlet 61 is shown communicating with a horizontally extending narrow lateral groove cut into the terminal end of the nosepiece 7 (6) -1';
Thereby, the inert gas is transferred at a low velocity to the gas control cave 8.
N-contact supply, resulting in agitation or disturbance of the molten metal to a total minimum. Thus, is cavity 8 an inert gas? It remains controlled by continuously feeding through one or more channels 19 at a pressure slightly above atmospheric pressure. The ingress of non-freezable gases, in particular oxygen and water vapor (and also atmospheric polluting gases such as oxidized sulfur and carbonic acid) into the cavity 8 can be prevented by continuously filling the cavity. The inert gas covers and purifies this cavity 8, after which it overtakes the undesired gas from the inlet region E.

During casting, the flow rate of the inert gas leaking through the gas supply channels 19 is kept constant, and the inert gas in the cavity 8r is kept at a pressure slightly VC higher than the atmosphere. As discussed in the first part, f between the downstream end of the nosepiece and the upper and lower mold surfaces 9, 10 moving continuously in the direction indicated by arrows 51 and 52.
iJlvC has a slight vertical VC play gano f22 (FIG. 3). In this casting machine, these moving mold surfaces 9, 10 are formed by casting belts. Some of this constant flow of inert gas exits upstream through the aforementioned narrow play gap 22.
is smaller than 27 mm (0.03; 0 inch), usually 0.2! ; within the range of mm (0,070 inch) to 0.3 mm (0,020 inch). These clearance gaps 2 of North Heath 7
The inert gas exiting through 2 advantageously scrubs and purifies atmospheric gases, including water vapor 1, and excludes them from the mold surface 9° IO and evacuates them from the artificial area E.

The above-mentioned close flow, exclusion, enclosing and purifying action of the moving mold surfaces is enhanced by the formation of narrow grooves 66 as the moving mold surfaces 9, 10 turn around and approach the inlet area E;
Moving mold surface9. Covers a large area of IO. narrow groove 6
6 is provided with a curved shielding member 34 (FIG. 3) between the swash plate 33 and the moving mold surface.
Contain the escaping inert gas close to 10. The shielding member 34 has a voltage of 9.10V on each curved moving mold surface. - curved into a cylindrical shape for close arrangement, and spaced from these moving mold surfaces 9, 10 by less than 0 in (/ /≠ inch), preferably within 3 mm (/ /g inch); located close to. The front (downstream) end of the curved shield member 34 abuts along the ridgeline 64 of the substrate 28 near the upstream edge of the chamfered shield 59 . The inert gas flows in close proximity to the moving mold surface, the ridges flowing through the narrow grooves in the direction opposite to the core movements 51 and 52 while expelling and purifying, and in close proximity to the shielding member 34. It emerges from the narrow groove 66 between the movable mold surface 9 and 36 (FIG. 3).

The use of the shielding member 340 favors the consumption of inert gas and also protects the moving mold surface 9.10 for atmospheric gas exclusion and purification.
'i Increase the time of exposure to inert gas δ.

If you want to significantly increase the resistance of atmospheric gases to enter the populated area E, use the thin grooves 6 of the loose HJ flexible/slip material 23.
Put it in 6. Babcock
& Wllcok) or [KaOWOOl J Ceramic Insulator]. The loose pieces may be brought into close contact with the moving mold surface. Also, the relevant number is 23
As shown in , it is preferable that the groove 66 be located within the narrow groove 66 and/or adjacent to the front end of the inclined shield portion 59 of the nose piece 7 . This loose packing 23Ii may be used only for the direct supply of inert gas to the cavity 8 through the channel 19 of the nosepiece 7 (FIG. 4). The gas in the moving mold surface 9, 10 and/or as described in U.S. Pat.
7/, ri0. ! It is clear that adsorption is achieved by those coatings such as those described and claimed in this issue. Also, due to the use of a roughened moving mold surface 9.10 with grid blasting, atmospheric oxygen and other gases tend to become entrained in the small nooks created. Furthermore, in addition to adsorption, rough coatings on the moving mold surface can also be entrained by atmospheric air. The adsorbed and/or entrained atmospheric gases are continuously carried into the moving mold and thus have an adverse effect on the metal being cast, but, as mentioned above, the inert gas is used to prevent the moving mold surface 9, ]0 produce beneficial cleaning, diffusion and elimination effects.

In addition to exiting the moving mold surfaces 9, 101C by exerting a diffusion and cleaning action, some of the inert gas is pressurized by flowing out across the respective moving 1g dams 17 transversely to each side. Exiting from the gas control cavity 8, atmospheric gases are purified and excluded from these edge dams 17 and their ingress into the inlet area is excluded.

This inert gas is often nitrogen, but argon,
It may also be carbon dioxide or other gases which are suitably inert and non-reactive with respect to the particular metal or alloy being cast. Advantageously when casting aluminum and hyaluminum alloys (the inert gas that can be used is water 2
This "dry wicking" is a pre-purified nitrogen, known as "dry" nitrogen, which is different from the nitrogen wicked with oil bonnos, i.e. the watertight wicking of Congres FvC. Nitrogen is commonly sold to welders as a shielding gas. Typical specifications (for such nitrogen shields) are less than parts per million oxygen;
Requires less than one part per million of water.

The supply of inert gas through more than t channels 19 of one refractory nosepiece 7 with an outlet 61 communicating directly with the gas-controlled fil I cavity 8 is referred to as direct injection of inert gas. The advantage of this direct injection into the cavity 8 is that it dilutes and expels from the inlet area E any oxygen, water vapor or other harmful or contaminating gases, which are present in the injected molten metal stream 60. It is the one that is emitted by the mold and nozzle arrangement VC under the very large heat release that occurs from the VC.

In order to properly control and eliminate problematic atmospheric gases, something other than direct injection of inert gas into the cavity itself is required. Sunawamo, moving mold surface 9
．． 10 is also surrounded and purified by gas flowing upstream through channels 66 created in close proximity to the moving mold surface by shielding member 34 as described above and as follows.

In addition to, or as a variant of, this direct injection, an advantageous indirect supply of inert gas may also be employed. If you look closely at FIG.
8, it can be seen that the inert gas G is supplied to the shed-shaped Blenheim supply chamber 54. The supply port 58 is threaded for connection to gas supply piping or flexible conduit (not shown). Gas G11-1. discharged from this plenum chamber 54. , as shown by the arrows, passes through the plurality of vertical passages 27-1 and enters each long perforated channel 27. The channel 27-2, which is a slotted hole, extends horizontally in the downstream direction within the substrate 28, and is connected to the header channel 2, which is perforated in the horizontal direction.
7-31/l: communication, the header flow path 27-3 is a substrate,
It communicates with a plurality of small holes 24 in a chamfered shield part 59 of a 7" rate 28. The upstream end of the vertically bored channel 27-2 is based on a plug 67. The drilled header channel 27-3 is also blocked by a plug 67.

If it is desired to add some of the inert gas G in the header flow path 27-3 laterally to the edge column, small holes 24-2 can be made in the latter two plugs 677. Approximately 23mm
When fabricating to a thickness Kfi of Cl inches), it is typically not necessary to provide lateral flow holes 24-2. Up to such a thickness, sufficient pressure is maintained in the gas control cavity and
The inert gases move laterally towards the edge dam members 17 of the moving mold and also move upstream along the vertical sides 6 (IVC) of the substrate 28, and these moving inert gases The flow rate and amount are sufficient to prevent debris from entering the J-shaped area E.

The inert gas emitted through the small holes 24 of the slanted shield 59 gently and noiselessly breaks, covers, wraps and cleans the movable mold surfaces 9, 10 in the vicinity of the mold. And you can use them to your advantage. If the direct feed gas flow path 19 is removed from the IC nosepiece 7 as shown in FIG. 5, the movements 51', 5 of the mold surfaces 9, 10
2 (Fig. 3) carries some of the inert gas to the cavity 8.
Put it in. An advantageous device has a center-to-center distance of 2 jmm (
For example, small holes 24 with a relatively small diameter of A m, mc 0.0 m, λ inch) are arranged horizontally.

“Dry wicking” crab element as inert gas G? Channel 2
7-1.27-2.27-3 and through small hole 24='
+ m The flow rate successfully used in the continuous casting of feed aluminum and aluminum alloys is 333 m, m (/≠ inch) in width of the casting and thickness of , 2
0 per 7 hours for objects up to 3 mm (/inch)
．． 2g cubic meter (70 cubic feet). This amount of 08.2 cubic meters per 7 hours is the volume of inert gas at atmospheric pressure and room temperature. The corresponding calculated rate of noiseless inflow of inert gas from the small holes 24 is about 5 feet per second (about 5 feet per second). The difference is that the pressure inside the shed-shaped lenum supply chamber 54 is higher than the atmospheric pressure, and the pressure is thought to be less than 0.07 km/sq/lb. It will be done. According to the above relationship 24, we have a theory that this low flow is within the fluid flow parameters that are effective when laminar flow opposes turbulent flow. .

Laminar flow is non-turbulent due to constant flow, and non-turbulence is necessary to avoid air entrainment. The turbulence and agitation noise associated with too high a speed are all air entrained, and this air entrainment is undesirable. Whether or not our theory that laminar flow prevails is correct, as stated above, the use of the present invention will yield favorable results in the continuous consolidation of aluminum and aluminum alloys, and It is advantageous for continuous casting of other metals in substantially horizontal or π-inclined continuous machines where oxidation or contamination of the cast product is a problem.

These small holes are machined into lateral slots or grooves 24 cut into the sloped surface 59 to reduce the potential for IC turbulence and reduce the tendency to entrain air as the inert gas exits through the orifice 24. It ends at -1.

As the inert gas is forced out of the collar holes 24, it slows down and thus moves onto the moving mold surfaces 9, 10. It is clear that this creates a continuous band or "ridge" of fine pressure in the tip region between the sloped shield 59 and the forward (downstream) end of the nosepiece. This deceleration and generation of pressure ridges is aided by having the small holes 24 terminate in transverse spots or grooves 24-1. ) Some of the gas from this pressure ridge flows into the gas control cavity 8 through the idler gear saw 22 . The remainder of the inert gas from this pressure ridge flows upstream (in other words, closely flowing, eliminating and purifying through grooves 66 and 36 as described above). get out.

An indirect method of applying an inert gas gently, i.e., as described above, by forming a pressure ridge in the tip yi region near the nosepiece, without audible perturbations at the entrance E of the moving mold. In order to produce aluminum casting products P and aluminum alloy casting products P in a quiet manner, aluminum alloys containing especially magnesium, and in particular a relatively high proportion of magnesium, are used. This is the preferred method of manufacture.The above magnesium-containing alloys are free of undesirable and problematic surface oxygen
Moreover, it has excellent quality and characteristics both on the surface and inside.

It is advantageous to simultaneously use both the tangential and indirect methods of introducing inert gas gold. For example, when the molten metal at the inlet E of the moving piece type is expected to rise to a level sufficient to at least cover the lower play gap 22 of the nose piece (FIGS. 3 and g), this lower play gear gap 2
2, the lower sill is connected to the gas supply channel of the structure 26 through the entire shed-shaped lennum chamber 54, and the inert gas is introduced indirectly. Covered and controlled. Such downward tightening is similar to the gas supply flow path of structure 26, and upward tightening is similar to that shown in FIG. Thus, the lower play gap 22 (Fig. 3 and Fig. g) is covered and controlled by the indirect method,
On the other hand, the upper play gap gag 22 simultaneously flows upstream of the cavity 8 through the upper play gap gag f22 (FIG. 3 or g) and further flows upstream through the upper approach flow groove 66. Covered and controlled by active gas.

In FIG. 6 and FIG. It opens into a lightly pressurized lumen chamber 54 through one of the communicating projections 43 .

If it is desired to increase the flow of inert gas near the nosepiece clamping supports 25 and 26, an additional outlet hole 72 may be inserted through the swash plate 33 to provide a pressurized differential loss. A hole is opened so as to communicate with a hut-shaped lunum chamber 54.

When casting high melting point metals, for example copper, iron and steel, the moving mold surfaces 9, 10 are covered with an appropriate coating, for example a coating of the Nlicon oil Taino or Haalkyl oil type. Union Carbide
LICO available from
N L8-300X and may be used with or without mixtures of graphite. 1 for such high melting point metals is usually the 72nd
It is advantageous to use a nosepiece 7 having a plurality of parallel reinsertable pouring nozzles or tubes 21 in conjunction with the tundish 4 shown in FIGS. g and 7. These restretchable tubes 21 can be inserted into the nosepiece 7 and communicate with the molten metal in the tundish 4, as shown most clearly in FIG. These cabinets 21 are made of a refractory material with a durable temperature, and this refractory material can be melted, for example! oxide (quartz), unplated titanium, dissolvated aluminum or high temperature refractory crabmide, all of which are commercially available in the form of buds.・U21 is embedded in the parallel hole of the nose piece 7 which is accurately machined.

Figure 5. Mantissa parallel supply gas channels 63.39 similar to the configuration shown are provided with a single hole in the nose piece 7Vr which allows inert gas G to flow directly into the gas control cavity 8 (Figure g). . These small active gases each have a vertical flow r66
3 through a supply passage 70 located at a suitable location communicating with
The pressurized differential loss comes from a shed-shaped lunum chamber 54. The play gap near the downstream end of the nozzle member 7 is indicated at 22.

In order to isolate the gas control cavity from atmospheric gases and to further provide resistance to the ingress of such gases, the above-mentioned loose oI flexible packing ring 23 is attached to the base plate 28 of the structure 25, 26 with supporting fastenings. are located above and below the nosepiece 7 adjacent to the downstream edge of the shoulder 59 (Fig. ≠). This packing 23 may contact the moving mold surfaces 9,10.

In addition to the supply gas flow path 19, the inert gas is supplied between the swash plate 33 (Fig. It may also be supplied to the narrow grooves. Figure g shows a curved shielding member 34 (Figures 3 and 7).
Although not shown in FIG. 7, it will be appreciated that such a connection may be used for metal delivery by the multi-tube 21 shown in FIGS. 7 and ♂. Torn and tightened M relics 25, 26
0 channel 27-, I, z7-2.27-3.24 and 2
1-1 Indirect supply of inert gas may be employed.

The method of supplying molten metal at the entrance EK of the movable mold C shown in Figures 2.3 and g is called "closed pool" (with the sump closed) supply, and it means that the desired $i18 This is because, as described above, the small M gap gag 22 VC adjacent to the downstream end of the nose piece 7 is actually closed.

An alternative to full molten metal feeding, referred to as "closed pool" feeding, is shown in FIG. Although the open reservoir supply does not include the closely mounted nosepiece 7,
When casting a metal section with a thickness of more than 3 gmm (/θ inch), it is sometimes necessary to cut the steel. Inert gas is supplied to the funnel-shaped chamber 54' through the supply port 68. These pressure losses are absorbed by the curved shielding member 34. Base &
28 and support fastening are made up of the structure 25 or 26, the rear wall 45, and the serial member support wall 74V welded between the rear wall 45 and the shank member 34. What about inert gas? The entire outlet adjacent to the downstream end of the curved shielding member 34 exits from the funnel-shaped chamber 54' and extends downward bTt, Vc.
Some of this inert gas flows through the inlet area εV of the moving mold C.
It flows in like a commercial. Some of this inert gas cleans the moving mold surface and returns upstream through slot 66, thus exiting the slot at 36.

Multiple reinsertion CIJ capable tubes made of high temperature refractory materials2
Although the supply of metal from 1 is described as being used for a metal or alloy having a high melting point r, such a plurality of 'WV
The supply by C may also be used for low melting point metals and alloys, if desired.

Any results of the methods and apparatus described above are subject to US% approval.
3,937,270% and rjmll-,002,197
The application for the simultaneous use of pre-heated belts and/or/zo as stated in the No. 1 and claimed in the United States was filed in the United States on October 2, 2010, and was accepted as a minor invention. By pre-heating the steam V-twisting belt very close to the front of the inlet E of the moving mold C, as stated in the filed application No. , two kuruto casting machines? It will be improved.

The present invention is particularly useful when fabricating aluminum alloys with a horizontal or downward orientation, particularly aluminum alloys and their alloys, especially aluminum alloys with a relatively thin cross-section. improving the surface quality and characteristics of continuously cast metal products P. The non-inventiveness is further explained by the fact that such a sequence 1j
) n Also improves the internal quality and characteristics of metal products. The present invention also improves the quality of thicker continuously cast metal products P when cast in a horizontal or downwardly inclined manner.

As used here, the term "one shot in the F direction" means any angle less than 11-50 degrees with respect to the horizontal direction, usually less than about 20 degrees. . 3 Examples of aluminum alloys that can be cast using the present invention to advantage: Full/ Width of moving mold ≠ n1 m (/inch) / 7 hours @
Width of moving mold, 2s, 4mm (/inch), 36kg (/1I) per 7 hours, used at casting speeds up to 63,, kg (,/, -11-00 bond) AA3003゜1+! used at casting speeds up to -00,!?/de)! I 3 Width of moving mold, 2'A mm (/inch), AA3103° used at casting speeds up to at least 4/-j kg (/θoo pounds) per 7 hours Example ≠ Width of moving mold 2! ;,'y'rnm (/inch), at least 1A311. per 7 hours. KgcloOose:
A A 707J used at a casting speed of y do) i,
Seconds Oj Im of the moving mold, 2s: ≠ mm (/inch), Mold speed up to 22 kg (// θ lb) per 7 hours, Magne 7 Yum! , an alloy containing up to a small amount of %.

Examples Hard alloys containing up to 30% by weight of magnes, used with a casting mold width of 23 mm, IIL mm (finches), at a casting rate of at least ≠ j kg per hour (10θ0 fractured).

Example 7 Width of moving mold! 3 mm (/-17 mm), used at a casting rate of at least 333 kg (//73 bond) per 7 hours, and containing at least 100% of the alloy.

Example: Width of moving mold ≠mm (/inch), used at a casting speed of at least ≠jkg (/0007W/d) per 7 hours, 0.3% by weight of a 01g heavy lid p, A310. j and #
I-similar alloys.

1/I] Width of movable mold, 2 friends 11 trnmC/inch), / Uniform amount V stiffness 1'r, spider IILslltkg (i
ooθ, 1 y g) 1 change at a casting speed of Mf, /, 0.3 yen of magnesium, 0.3 y of silicon, 0.3 y of iron and 0.3, l It t
Alloy containing % manganese.

Although one particularly preferred embodiment of the invention has been described in detail herein, it is to be understood that these embodiments of the invention are presented for purposes of illustration.

This disclosure should not be construed as limiting the scope of the invention and, therefore, the described method and apparatus may be adapted to a particular casting machine without departing from the scope of the claims. Details may be modified by those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the upstream end or inlet of a continuous casting machine according to an embodiment of the present invention, looking from the upstream side of the twin belt carriage to the outside of the twin belt carriage. Fig. 2 is a partial cross section of a casting machine according to an embodiment of the present invention. This is an elevation view including the exterior of Lutocarino.
The casting area is shown tilted downward at a predetermined angle. Figure 3 is a cross-sectional elevational view of the upstream or feed end of the machine, which is equipped with a semi-closed nosepiece for casting relatively thin metal sections while supplying inert gas. Show something enlarged. Figure ≠ is an enlarged perspective view of one of a pair of refractory material support mounting structures, which are adapted to supply inert gas by directing it to one of the free space supports in the adjacent area. is configured to do so. FIG. 5 is a perspective view of a refractory metal delivery nosepiece, a wide nosepiece whose shape is suitable for total delivery of low melting point molten metal. Fig. 3 is a perspective view of the nosepiece shown in Fig. 3;
Is there an inert gas directly in the entrance cavity of the moving mold? It has a flow path for introduction. Figure 7 shows the increase in the supply of molten metal with a high melting point.
It is a top view of Lee/Yu. FIG. 1A is a cross-sectional elevational view of the tundish of FIG. 7, relating to the upstream or feed end V of a continuous casting machine for casting relatively thin metal sections while supplying an inert gas. Figure 2 is a cross-sectional elevation view generally similar to Figure 3. Figure 3 shows a metal supply assembly for supplying an inert gas to an open metal supply boule and then continuously supplying a metal at a brittle temperature. 2 shows a gas shield surrounding ventilation hole and a gas shield flow path that are assembled together. 1... Molten metal, 2... Gutter, 4...-Tandish, 7... Nose piece, 9.10... Casting belt, 11... Machine frame, 17... Edge dam, 18... Drive mechanism, 25.26... Support structure, 43... Land, 44... Groove, 54... Blenheim chamber, 56... Installation bracket, 61... Gas supply port . Chick Ame (Tsuka United States Vermont 05 452 Essex Junction Livendale Drive 1 1, Incident Display 1981 Patent Side No. 76 (
129 No. 3, ? Relationship with the case of a person who commits diversion Applicant 4.1 (: pJ! included)

Claims (1)

[Scope of Claims] (i) Molten metal is introduced into a moving mold whose downstream direction is approximately horizontal or downward (vcH); In a method for continuous casting of metal products having a relatively thin cross-section from molten metal in one contact, the distance between the pot supply device and the surface of the moving mold is 0,000 mm, ) inserting a metal feeder into the metal feeder with a smaller play gear; and providing at least seven metal feed channels extending downstream through the metal feeder; a stage for providing at least seven gas supply channels extending downstream of the inlet of the moving mold; and a further stage for supplying an inert gas through the force supply channels at a pressure slightly above total atmospheric pressure. said inert gas being inert and substantially non-reactive with respect to the cast metal. (2. In the method for continuously casting metal products with a relatively thin cross section directly from molten metal as set forth in claim 1, the metal supply device replaces the refractory material supply device,
A method characterized in that the refractory material supply device is provided with both the metal supply channel and the gas supply channel. (3) f! described in claim 1! In a method for continuously casting metal products with a relatively thin cross section directly from molten metal, the metal supply device includes a refractory material supply device and a rigid support member for fully supporting the refractory material, An advantageous method is to provide the gas supply flow path in the gas supply channel. (4) In the method for completely continuous casting of relatively thin cross-section metal products directly from molten metal as set forth in claim 1, in order to hold the refractory material sandwiched between the support parts, A method characterized in that rigid support members are provided above and below the refractory material, and force supply channels are provided on both of the support members above and below the metal supply channel. (5) The solution (
In a process for continuous casting of relatively thin cross-section metal products directly from molten metal, the level of molten metal in the inlet of the moving mold downstream of either metal feed channel is reduced to provide a cavity at the inlet of the moving mold. applying an inert gas to at least one moving mold surface to maintain and blanket the cavity with an inert gas to exclude atmospheric gases from the cavity and to control the gas volume g of the cavity. A method characterized by causing the person to be transported. (6) ``@iff'' as described in item g or item j of the claims. In a method of continuously casting metal products with a relatively thin cross section directly from molten metal, an inert gas is introduced into the gap of the solenoid. the gap and each moving mold surface moving in the direction of the inlet of the moving mold, thereby causing each of the moving mold surfaces to carry inert gas through the respective free gap into the population of the moving mold. , a gas supply flow path extending downstream of each of the supporting members and terminating near the respective idler gear horn. (7) Claim 3. In the method described in the above, an inert gas heavier than air is added above the metal feed channel to give the inert gas a similar shape to that which is intended to be on the metal feed device near the upper gap. A lighter-than-air inert gas is placed below the metal feed channel in order to quietly supply the metal feeder and to allow the inert force to have a rising and retracting slope relative to the metal feeder near the lower clearance gear. A method characterized in that gas gold is supplied quietly. (8) In the method according to claim 2, by forming a cavity downstream of the metal supply channel at the inlet of the moving mold, the inlet of the moving mold is free of molten metal or metal. In order to control the gas capacity of the cavity by filling/filling the frozen cavity with an inert gas at a pressure exceeding atmospheric pressure, the inert gas is introduced into the cavity from the gas supply channel. The whole method features direct feeding. (9) A method as claimed in claim 2 or any of the preceding claims, further comprising a step of loosely sealing each of the play gaps with a flexible isolation ring in light contact with the moving mold surface. Ct* In the method described in any one of claims 2 to 7, before the gas in the atmosphere enters the moving mold, the inert gas is added to the moving mold of each casket in the atmosphere. further comprising a stage for flowing an inert gas through an inlet of the moving mold and upstream in close proximity to the moving mold surface as atmospheric gases approach the population to purify and eliminate them from the surface; Method. ←]) Claim 2. A method according to any one of paragraphs 9 and 70, wherein the refractory material is extended parallel to each other in a downstream direction, and the molten metal is passed through the metal supply channel through the entire length of the metal supply channel. a stage providing a plurality of metal feed channels feeding the inlet of the moving mold; and at least seven gas channels located generally between and parallel to a pair of adjacent metal feed channels extending downstream within the refractory material. A method that roughly includes steps for providing a supply flow path. 02, in the method according to claim 1, a diagonal gas supply channel extending in the downstream direction within the refractory material is provided between each pair of metal supply channels that are in contact with each other. , a stage in which inert gas at a pressure in excess of atmospheric pressure is simultaneously supplied to the inlet of the moving mold through all of the above gas supply passages? How to include more. (2) Claim No. 22g, 10, /
/ and in the method according to any one of paragraphs 72, an inert gas in the gas control cavity upstream of the level of the molten metal at the inlet of the moving mold? For direct introduction, the level of the outlet of the metal supply channel is further increased by a step providing the outlet of the X supply channel. α4 An apparatus for carrying out the entire method of claim 1 for continuously casting metal products with a relatively thin cross section directly from molten metal, wherein the downstream direction is mostly horizontal or downwardly inclined. In a device in which one molten metal is introduced into the I-mold and the moving mold is defined between opposing cold moving mold surfaces, a a metal feed device inserted into the inlet with an idle gear solenoid of less than 0.27 mm (0,0 in.); the metal feed device having at least seven metal feed channels extending downstream therethrough; a device for supplying molten metal to the movable mold through the metal supply channel, the metal supply device having at least seven gas supply channels extending downstream of an inlet of the movable mold; A device for supplying active gas through the gas supply channel at a pressure exceeding the total atmospheric pressure or the inert gas
1. An apparatus characterized in that the gas is inert and substantially non-reactive with casting residues. αG A comparatively thin cross-section metal manuscript product directly produced from molten metal according to claim 1≠? In an apparatus for continuous casting, in which the metal supply device includes a refractory material supply device, the circular side of the metal supply channel and the gas supply channel is inside the refractory material supply device. A device characterized by something. (IQ %) An apparatus for continuously casting metal parts having a relatively thin cross section directly from a bath molten metal according to claim 14', wherein the metal supply apparatus is a refractory material supply apparatus, and the a rigid support member for supporting a refractory material, wherein the gas supply channel is within the support member. An apparatus for continuously casting relatively thin cross-section metal products directly from metal, comprising rigid support members above and below the refractory material to hold the refractory material sandwiched between the support members. An apparatus characterized in that a gas supply channel is provided on both of the support members above and below the metal supply channel. α frame Direct comparison from the molten metal according to claim 1 B or claim 77 In an apparatus for continuously casting thin cross-section metal products, the level of molten metal at the inlet of the moving mold is downstream of either metal supply channel, thereby creating a cavity at the inlet of the moving mold, and , at least one transfer mold surface conveys an inert gas into the cavity to exclude atmospheric gas from the cavity and control the gas content of the cavity by blanketing the cavity with an inert gas. An apparatus characterized in that: (to) Claim 17 or /g V In the apparatus for continuously casting metal products of relatively thin cross section directly from molten metal, Gently direct an inert gas onto each of the moving mold surfaces moving in the direction of the moving mold, thereby directing the inert gas through each of the idler gears into each of the moving mold surfaces. Apparatus characterized in that a gas supply channel extends downstream through each of said support members and terminates near the respective idler gear saw. 1. In the equipment described in any one of paragraphs B, /7, 7g and /, the inert gas V
This tends to be on the metal feeder near the upper free play gear knob, so it's more likely than not to be a scumbag. A lighter-than-air inert gas is supplied above the metal feed channel to provide a gentle feed of the inert gas above the metal feed channel and to cause the inert gas to tend to rise and draw toward the metal feed near the clearance gag. and a device for gently feeding metal into a metal feed channel. Qρ In the apparatus according to claim 1j, V), by forming a cavity in the flow F of the metal supply channel at the inlet of the moving mold, the inlet of the moving mold is at least devoid of molten metal. for supplying an inert gas directly to the cavity from the gas supply channel in order to provide seven regions and fill the cavity with a pressure above atmospheric pressure, thereby controlling the gas capacity of the cavity; A device characterized in that it is equipped with a device. (b) %ifF 1 fit range In the apparatus described in item 1 or item 27, a flexible separator that lightly contacts the surface of each moving mold is provided in order to loosely base each of the clearance gears. A device characterized by: 2) In the apparatus V according to any one of claims 1≠ to 22, gases in the atmosphere are transferred.
Before entering the mold, the entire inert gas flow is removed as the atmospheric gas approaches the inlet in order to allow the inert gas to clean each moving mold surface and eliminate the atmospheric gas. A curved shielding member was provided in close proximity to each moving mold surface to flow from the inlet of the moving mold and upstream in close proximity to and opposite to the moving mold surface (direction 4). A device characterized by: (C) Claims No. 73. of/,! ! and 13
In the apparatus according to any one of the preceding paragraphs, a number of metal supply channels parallel to each other and containing the highly flammable substance, and a molten metal passing through all of the metal supply channels to the moving mold. and at least seven gas supply L channels parallel to and generally between the pair of adjacent metal supply channels and extending downstream of the refractory material. A device that does this. ) Apparatus V described in Section 24L of the range of requirements for special fgW
C, between the valleys of adjacent metal supply channels,
A plurality of gas supply channels extending downstream in the refractory material, and a device for simultaneously supplying inert gas at a pressure exceeding atmospheric pressure to the inlet of the movable mold through all the gas supply channels. A device characterized by being provided with. (g) Scope of Claim 7. ! In an apparatus for continuously casting metal products according to any one of paragraphs 2/, 2, 23, 24L and 2j, a gas control cavity upstream of the level of molten metal at the inlet of the moving mold; Apparatus characterized in that the outlet of the gas supply channel is located upstream from the level of the outlet of said metal supply channel for the direct introduction of all inert gas into said metal supply channel.