MXPA97010390A - Metal tape for fun - Google Patents
Metal tape for funInfo
- Publication number
- MXPA97010390A MXPA97010390A MXPA/A/1997/010390A MX9710390A MXPA97010390A MX PA97010390 A MXPA97010390 A MX PA97010390A MX 9710390 A MX9710390 A MX 9710390A MX PA97010390 A MXPA97010390 A MX PA97010390A
- Authority
- MX
- Mexico
- Prior art keywords
- molten metal
- nozzle
- fold
- delivery nozzle
- walls
- Prior art date
Links
- 239000002184 metal Substances 0.000 title claims abstract description 132
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 132
- 238000002844 melting Methods 0.000 claims abstract description 23
- 230000014759 maintenance of location Effects 0.000 claims abstract description 11
- 238000005266 casting Methods 0.000 claims description 43
- 230000015572 biosynthetic process Effects 0.000 description 10
- 230000005499 meniscus Effects 0.000 description 9
- 238000005755 formation reaction Methods 0.000 description 7
- 238000007711 solidification Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 230000004301 light adaptation Effects 0.000 description 3
- 230000002028 premature Effects 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N AI2O3 Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 ferrous metals Chemical class 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 210000004907 Glands Anatomy 0.000 description 1
- 241000270295 Serpentes Species 0.000 description 1
- XWROSHJVVFETLV-UHFFFAOYSA-N [B+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O Chemical compound [B+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O XWROSHJVVFETLV-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 235000013601 eggs Nutrition 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000003068 static Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Abstract
The twin method and apparatus for melting a cylinder in which the molten metal is introduced between a pair of fresh cylinders (16) through an elongated delivery nozzle (19) to form a cast puddle (68) above the point of retention (69) between the cylinders (16). The cylinders (16) are rotated to melt a solidified ribbon (20) sent downward from the retention point (69). The delivery nozzle (19) comprises an upward opening syncline crease having side walls (62), a floor (63) and lower outlet openings (64). A pair of walls or vertical flow barrier walls (84) rise from the floor (63) to define an internal syncline (85) to receive the inflow of the molten metal (65). The barrier walls (84) prevent the direct flow of the inlet metal towards the outlet openings (6).
Description
METAL TAPE FOR. MELT
Background of the Invention
This invention relates to the casting of a metal belt. It has particular but not exclusive applications for the melting of ferrous metal tapes.
It is known how to melt metal ribbons by means of a continuous melt in a double cylinder melting machine. The molten metal is inserted between a pair of casting cylinders against horizontal rotations that are cooled, so that the metal layers solidify on the surfaces of the cylinder in motion and are brought together to the line of contact between them to produce a product of solidified tape sent down from the line of contact between the cylinders. The term "contact line" is used herein to refer to the general region in which the cylinders meet together as closely as possible. The molten metal can be placed from a pouring ladle into a smaller container or into a series of smaller containers from which it flows through a localized metal delivery nozzle. The line of contact will be drawn to the line of contact between the cylinders, and thus forge a cast iron charro of molten metal supported on the surfaces of the melt of the cylinders immediately above the contact line. This casting pond can be limited between the side plates or stagnation held at the slip joint with the ends of the cylinders.
Although the casting of double cylinders has been applied with some success to non-ferrous metals that solidify rapidly upon cooling, there are problems in applying the melting technique of ferrous metals that have high solidification temperatures and tend to produce defects caused by uneven solidifications. in the cool casting surfaces of the cylinders. Much attention has been paid to the design of metal delivery nozzles aimed at producing a smooth, even flow of metal into the melting puddle. US Pat. Nos. 5,178,205 and 5,238,050 disclose adaptations in which the nozzle extends below the surface of the cast puddle and incorporates a means for reducing the kinetic energy of the molten metal flowing down through the molten metal. the nozzle towards an outlet groove at the submerged lower end of the nozzle. In the adaptation disclosed in US Specification 5, l "73, .05, kinetic energy is reduced by a flow diffuser having a multiplicity of flow passages and a deflector located above the diffuser. Underneath the diffuser the molten metal moves smoothly and evenly out through the outlet slot in the melting puddle with minimal discomfort In the adaptation disclosed in the US Specification, 5,238,050 of the molten metal are allowed to fall so that they fall into a side wall surface which slopes from the nozzle at a precise angle of impact, so that the metal adheres to the side wall surface to form a flow sheet , which is directed to an output flow passage, again the goal is to produce an even flow that moves smoothly from the bottom of the delivery nozzle to produce the minimum of separates of the foundry puddle.
Japanese Patent Publication 5-70537 of Nippon Steel Corporation also discloses a delivery nozzle which is directed to the production of a smooth, slow-moving flow of the metal in the melting puddle. The nozzle is fitted with a porous deflector / diffuser to extract the kinetic energy from the molten metal flowing down, which then flows into the melting puddle through a series of openings in the side walls of the nozzle. The openings are angled in such a way that they direct the metal inlet flow along the cast surfaces of the longitudinal cylinders of the contact line in one direction and the openings on the other side direct the metal flow of entering in the other longitudinal direction with the intention of creating a smooth even flow along the casting surfaces with minimal discomfort from the puddle surface.
After an extensive test program we have determined that a major cause of defects is the premature solidification of the molten metal in regions where the surface of the puddle meets the casting surfaces of the cylinders, generally known as the "meniscus" or Meniscus regions of the puddle The molten metal in each of these regions flows to the adjacent casting surface and if solidification occurs before the metal has made uniform contact with the surface of the cylinder, it tends to produce a heat transfer irregular initial between the cylinder and the layer with the resulting formation of surface defects, such as depressions, ripple marks, cold folds and cracks.
Previous attempts to produce a very even flow of molten metal in the puddle have to some extent the problem of solidification by the direction of the inlet metal outward from the regions in which the metal first solidifies to form the surfaces of the metal. cover that eventually become the outer surfaces of the resulting tape. Accordingly, the temperature of the metal in the region of the surface of the melting puddle between the cylinders is significantly lower than that of the input metal. If the temperature of the molten metal on the surface of the puddle in the meniscus region becomes very low, then the cracks and the "meniscus marks" (marks on the tape caused by the meniscus freezing while the puddle level is uneven) is very likely to arise. One way to deal with this problem has been to employ a very high level of superheating in the inlet metal, so that it can be cooled inside the melting puddle without reaching solidification temperatures before it reaches the casting surfaces of the cylinders. However, in recent times it has been recognized that the problem can be addressed more efficiently by taking steps to ensure that the incoming molten metal is delivered relatively quickly via the nozzle directly into the meniscus regions of the cast puddle. This minimizes the tendency of premature freezing of the metal before it contacts the surfaces of the casting cylinder. It has been found that this is a much more effective way to avoid surface defects than to provide an absolutely stable flow in the puddle and that a certain degree of fluctuation in the surface of the puddle can be tolerated since the metal does not solidify until that contacts the surface of the cylinder. Examples of this scope can be seen in Japanese Patent Publication No. 64-5650 of Nippon Steel Corporation and the present applicants of Australian Patent Application No. 60773/96.
In order to ensure that the incoming molten metal is sent relatively quickly in the meniscus regions of the casting puddle, it is necessary to employ delivery nozzles with lateral outlet openings to send the metal outwardly laterally from the bottom of the nozzle. delivery to the casting cylinders. Accordingly, it is required that the nozzle capture a downward flow of the molten metal and produce a smooth outward flow of the metal through the side outlet openings with the minimum turbulence and possible flow fluctuation. This requires that the kinetic energy downstream of the inlet current be absorbed and that the essential conditions of non-turbulence be established in the lateral outlet openings. Furthermore, this can be achieved within a very limited space within the lower part of the delivery nozzle without significant flow restriction. The above baffle and diffuser arrays are not suitable for this purpose, but the present invention provides a simple method and means to achieve this.
Compendium of the Invention
In accordance with the present invention there is provided a method of cast metal tape comprising:
the introduction of a molten metal between a pair of cast iron cylinders cooled through an elongated metal delivery nozzle placed above the contact line and extended therebetween therebetween the cylinders to form a metal melting puddle fused supported above the contact line and limited at the ends of the contact line through the puddle that limits the end closures, and
turn the rolls to melt a solidified ribbon that is sent down from the contact line;
wherein the metal delivery nozzle comprises an elongated channel with an upward opening having a floor and side walls extending longitudinally to the contact lines to receive the molten metal; the longitudinal side walls of the channel are provided with lateral outlet openings through which the molten metal is caused to flow from the channel; The channel floor is provided with raised flow barrier walls adjacent to the side exit openings and the molten metal is sent down into the channel between the flow barrier walls to fall on the channel floor and flow out against the barrier walls before they flow over the walls of the side exit openings.
Preferably, the lateral outlet openings of the nozzle are in the form of longitudinally spaced openings formed in each of the longitudinal side walls of the nozzle.
Preferably, the openings are modeled as elongated slots. The grooves may be closely spaced to promote the substantially continuous curtain jet streams of the molten metal in the melting puddle from the openings in the adjacent slot of the delivery nozzle.
The delivery nozzle channel can be supplied with the molten metal in a series of discrete free fall streams spaced apart longitudinally from the channel c in a continuous free fall curtain stream extending along the channel.
Preferably the molten metal is supplied to the delivery nozzle in a series of discrete free fall currents spaced apart longitudinally from the channel so as to fall on the channel floor at laterally aligned locations with space between the nozzle outlet openings.
Preferably, the raised barrier walls comprise a pair of laterally spaced walls raised from the floor of the channel and continuously extending along the channel to define an internal channel for receiving the inflow of the molten metal.
The invention also provides the apparatus for melting the metal strip comprising a para to parallel casting cylinders forming a line of contact between them; an elongated metal delivery nozzle positioned above and extended along the contact line between the casting cylinders to send the molten metal to the nip and a manifold positioned above the delivery nozzle to supply the molten metal to the molten metal. the delivery nozzle, wherein the metal delivery nozzle comprises an elongated channel with upward opening having a floor and side walls extending longitudinally of the contact line to receive the molten metal from the distributor; the delivery nozzle is provided with lateral outlet openings in the longitudinal sidewalls of the channel for the flow of molten metal outward from the bottom of the delivery nozzle; the floor of the channel is provided with raised barrier walls adjacent to the side exit openings and the manifold is operable to send the molten metal down the channel between the flow barrier walls to fall on the floor and flow out against the barrier walls.
The invention also provides a delivery nozzle for sending the molten metal to an apparatus for melting tape comprising an elongated upward opening channel having a floor and side walls extending longitudinally to receive the molten metal; the delivery nozzle is provided with the side exit openings in the longitudinal side walls from the bottom of the delivery nozzle and the channel floor is provided with raised barrier walls adjacent to the side exit openings to facilitate the delivery to the molten metal down in the channel between the flow barrier walls to fall on the floor the flow out against the barrier walls.
Brief Description of the Drawings
In order that the invention may be explained more fully, a particular method and apparatus will be described in detail with reference to the accompanying drawings, wherein;
Figure 1 illustrates a dual cylinder continuous ribbon casting machine constructed and operated in accordance with the present invention;
Figure 2 is a vertical cross-section through the important components of the melting machine illustrated in Figure 1, including a metal delivery nozzle constructed in accordance with the invention;
Figure 3 is a further cross-section through important components of the melting machine taken transversely from the section of Figure 2;
Figure 4 is an elongated cross-section through the metal delivery nozzle and adjacent parts of the casting cylinders;
Figure 5 is a side elevation of one half of the segment of the metal delivery nozzle;
Figure 6 is a plan view of the segment of the nozzle shown in Figure 5;
Figure 7 is a longitudinal cross-section through the segment of the delivery nozzle;
Figure 8 is a perspective view of the segment of the delivery nozzle;
Figure 9 is an inverted perspective view of the segment of the nozzle;
Figure 10 is a cross-section through the segment of the delivery nozzle on line 10-10 in Figure 5;
Figure 11 is a cross section on line 11-11 in Figure 7, and;
Figure 12 is a cross section on line 12-12 in Figure 7.
Description of the Preferred Modalities
The illustrated melting machine comprises a frame of the main machine 11 that rises from the floor of the factory 12. The frame 11 supports the car of the casting cylinder 13, which moves horizontally between a mounting station 14 and a station casting 15. The carriage 13 carries a pair of parallel casting cylinders 16 to which the molten metal is supplied during a casting operation from the ladder 17 via a manifold 18 and the delivery nozzle 19. The casting cylinders 16 are they cool with water, so that the covers solidify on the surfaces of the moving cylinder and are carried together at the line of contact between them to produce the product of solidified tape 10 at the outlet contact line. This product is fed from a standard reel 21 and can be transferred substantially to a second reel 22. A receptacle 23 is mounted on the frame of the machine adjacent to the casting station and the molten metal can be divided in this receptacle via a pipe. of over flow 214 on the distributor.
The cylinder carriage 13 comprises a frame of the carriage 31 mounted by wheels 32 on rails 33 that extend along the frame portion of the main machine 11 whereby the cylinder carriage 13 is mounted as an integer for movement along the rails 33. The frame of the carriage carries a pair of cylinder frames 34 in which the cylinders 16 are mounted rotatably. The carriage 13 can be moved along the rails 33 by actuating the double-acting hydraulic piston and the cylinder unit 39, connected between a drive bracket 40 on the cylinder carriage and the frame of the main machine so as to be can act to move the cylinder carriage between the assembly station 14 and the casting station 15 and vice versa.
The casting cylinders 16 are counter-rotated through the drive rods 41 from an electric motor and the transmission mounted on the frame of the carriage 31. The cylinders 16 have peripheral copper walls formed with a series of water cooling passages. spaced apart longitudinally and circumferentially supplied with cold water through the ends of the cylinders from the water supply ducts in the cylinder driving rods 41, which are connected to the water supply hoses 42 through of the rotary packing glands 43. The cylinders can typically be approximately 500 mm in diameter and up to 2 m in length in order to produce a ribbon product up to 2 in width.
The ladle 17 is entirely of a conventional construction and is supported via a fork 45 on a mobile crane from which it can be taken to a position from a hot metal receiving station. The ladle is placed with a retainer bar 46 operable by a servo cylinder to allow the molten metal to flow from the ladle through the outlet nozzle 47 and refractory liner 48 into the distributor 18.
The distributor 18 is formed as a wide plate made of a refractory material such as meltable alumina with a sacrificial liner. One side of the distributor receives the molten metal from the ladle and is filled with the aforementioned overflow 24. The other side of the dispenser is provided with a series of metal exit openings 52 spaced apart longitudinally. The lower part of the distributor carries mounting brackets 53 to mount the distributor in the frame of the cylinder carriage 31 and provided with openings to receive splitting spindles 54 on the frame of the carriage to locate the distributor precisely.
The delivery nozzle 19 is formed in two halves of identical segments that are made of a refractory material so that the alumina graphite is held end to end to form the complete nozzle. Figures 5 and 11 illustrate the construction of the segments of the nozzle that are supported on the frame of the cylinder carriage by a mounting bracket 60; the upper parts of the segments of the nozzle are formed with side flanges 55 projecting outwards, which are located on that mounting bracket.
Each nozzle half segment is generally of synclinal fold formation, so that the nozzle 19 defines a syncline fold 61 of upstream inlet to receive the molten metal flowing down from the orifices 52 of the distributor. The synclinal fold ßl is formed between the side walls of the nozzle 62 and the end walls 70 and can be considered divided transversely between its ends by the two flat side walls 80 of the segments of the nozzle that are brought together in the nozzle complete The lower part of the synclinal fold is closed by a horizontal floor 63 which coincides with the lateral walls of the synclinal fold 62 in the beveled corners 81 of the lower part. The nozzle is provided in these lower corners with a series of lateral outlet holes in the form of longitudinally spaced elongated slots 64 placed in a longitudinally regular space along the nozzle. Slots 64 are positioned to provide the exit of molten metal from the synclinal fold generally at the level of the synclinal fold floor 63.
In accordance with the present invention, a pair of vertical flow barrier walls 84 are raised from the floor 63 of the syncline crease of the nozzle 61 adjacent the slots 64. The walls 84 extend continuously through the length of the synclinal fold 61. to define an internal channel 85 of the syncline to receive the inflow of the molten metal as described below.
The outer ends of the nozzle segments are provided with end formations generally indicated as 87 which extend outwardly beyond the end wall of the nozzle 70 and are provided with the metal flow passages to direct separate streams of the molten metal to the "triple point" regions of the puddle, that is, those regions of the puddle where the two cylinders and side blast furnace plates come together. The purpose of directing the hot metal to those regions is to prevent the formation of "metal films" due to the premature solidification of the metal in these regions, as described more fully in our Australian Patent Application No. P02367 .
Each formation of the end wall 87 defines a small open container 88 to receive the molten metal from the distributor; this container is separated from the main synclinal fold of the nozzle by the end wall 70. The upper end 89 of the end wall 70 is lower than the upper edges of the syncline and the outer parts of the container 88 and can serve as a weir to allow the return flow in the syncline of the main nozzle from the container 88 if the container is too full, as explained more fully below.
The container 88 is in the form of a surface disk having a flat floor 91, lateral side and side faces 92, 93 and a transverse curve side face 94. A pair of triple point pouring passages 95 extending laterally outwardly. from this container just above the level of the floor 91 to be connected with the pouring outlets of the triple point 96 on the lower sides of the formations of the end of the nozzle 87; the outlets 96 are angled downwards and inwards to send the molten metal towards the triple point regions of the casting puddle.
The molten metal falls from the outlet orifices 52 of the manifold into a series of vertical free-falling streams 65 in the lower part of the syncline fold of the nozzle 61. The molten metal flows from this vessel out of the slots 64 to form the casting puddle 68 supported above the retention point 69 between the casting cylinders 16. The casting puddle is confined at the ends of the cylinders 16 by a pair of side closing plates 56, which are held against the ends 57 of the cylinders. The side closure plates 56 are made of a strong refractory material, for example of boron nitrate; they are mounted on the holders of the plates 82, which can be moved by driving a pair of hydraulic cylindrical units 83 to bring the side plates to the junction with the ends of the casting cylinders to form end closures for the puddle. casting of molten metal.
In the casting operation the flow of the metal is controlled to maintain the melting puddle at a level such that the lower end of the delivery nozzle 19 is immersed in the casting puddle and the two series of horizontally spaced grooves 64 of the nozzle of delivery are placed immediately below the surface of the casting puddle. The molten metal flows through the slots 64 in two jet streams directed outwardly laterally in the general vicinity of the surface of the melting puddle so as to hit the cooling surfaces of the cylinders in the immediate vicinity of the puddle surface . This maximizes the temperature of the molten metal sent to the meniscus regions of the puddle and has been found to significantly reduce the formation of crevices and meniscus marks on the surface of the casting belt.
In accordance with the present invention, the streams 65 fall into the channel of the internal synclinal fold 85 to collide on the floor 63 of the syncline 61 between the two straight flow barrier walls 84. Thus the shock metal is caused to flow towards outside against the barrier walls, which prevents direct flow into slots 64. To ensure effective reduction of kinetic energy, it is important that channel 85 be formed with a flat floor and vertical side walls that coincide with exactly defined corners to produce a double effect of shock.
The outlet orifices 52 of the distributor are longitudinally alternating from the nozzle with respect to the slots 64, so that the falling currents 65 strike the nozzle floor at locations between the successive pairs of the slots 64. It has been found that the system can be operated to establish a casting puddle that rises to a level just above the bottom of the delivery nozzle so that the surface of the cast puddle is just above the floor of the syncline the nozzle and at the same level as the metal inside the syncline. Under these conditions it is possible to obtain very stable puddle conditions and if the outlet grooves are angled downward to a sufficient degree, it is possible to obtain a static puddle surface.
It is important to note that the slots 64 are provided at the inner ends of the two sections of the nozzle. This ensures proper delivery of the molten metal to the puddle in the vicinity of the central nozzle division and prevents the formation of cast iron films in this puddle region.
These triple-spot casting containers 88 receive the molten metal from the two external streams 65 that fall from the distributor 18. The alignment of the two outer stems 52 in the distributor are such that each container 38 receives a single current which checks on the piano floor 91 immediately outside of the sloping side face 92. Shock of molten metal on floor 88 causes the metal to vent out through the floor and out through the pour passage of triple point 95 toward the outlets 96, which produces slanting jets downwards and inwards of the hot metal directed through the sides of the blast furnaces and along the edges of the casting cylinders towards the point of retention. The triple-point casting proceeds only with a wide and superficial puddle of molten metal within each of the synclinal folds 88; the height of this puddle is limited by the height of the upper end 89 of the wall 70. When the container 88 is filled, the molten metal can flow back over the end of the wall 89 in the main nozzle syncline, so that the end of the wall serves as a weir to control the depth of the metal puddle in the supply container of the triple point cast 88. The depth of the puddle is more than sufficient to supply the pouring passages of the triple point, as to maintain the flow to a constant head, with which a very even flow of the hot metal is achieved through the pouring passages of the triple point. This flow of control is the most important for an appropriate formation of the parts of the edges of the tape. Excess flow through the passages of the triple point may cause buckling at the edges of the belt since a small flow will produce casting film effects and "snake eggs" on the belt.
The lower sides 98 of the pouring formations of the triple point 87 rise above the surface of the melting puddle, so as to prevent the cooling of the puddle surface in the region of the triple point. Furthermore, the lower sides 98 are inclined outwards and upwards. This is desirable in order to prevent an accumulation of slag or other contaminants that accumulate below the ends of the nozzle. This buildup can result in a blockage of gas and fumes escaping from the melting puddle and the risk of an explosion.
The illustrated apparatus has advanced by way of example only and the invention is not limited to the details of that apparatus. In particular, it is not essential to the present invention that the nozzle be provided with triple point castings, although that is the preferred form of a nozzle here. Although it is preferred that the barrier walls 83 be of uniform height across the length of the nozzle, it would be possible to have wall sections of reduced height between the holes of the slot or even to provide uneven wall sections along the nozzle. Moreover, the flow of the internal synclinal fold 85 could be raised or lowered relative to the remainder of the floor 63 of the nozzle. It should be understood that these variations can be made without departing from the spirit and scope of the invention, which extends to each novel feature and combination of features disclosed herein.
Claims (19)
1. A method of cast metal tape comprising: introduce the molten metal between a pair of cold casting cylinders (16) through a delivery nozzle (19) of elongated metal placed thereon and extending along the retention point (69) between the cylinders (16) to form a cast puddle (68) of molten metal supported above the retention point and confined to the ends of the retention point by the closures of the confining end (56) and; rotating the cylinders in order to melt a solidified ribbon (29) sent downward from the retention point (69); characterized in that the metal delivery nozzle (19) comprises an elongated syncline fold that opens up (61) having a floor (63) and side walls (62) extending longitudinally to the retention point (69) to receive the molten metal; the longitudinal side walls (62) of the sincinal fold (61) are provided with lateral exit holes (64) through which the molten metal is made to flow from the sincline fold; the lower floor (63) of the synclinal fold is provided with straight flow barrier walls (84) adjacent to the side exit holes (64) and the molten metal is sent down into the syncline (61) between the walls of the syncline. flow barrier (84) to collide on the floor of the syncline (63) and flow outwardly against the barrier walls (84) before flowing over those walls to the side exit holes (64).
2. A method as claimed in claim 1, further characterized in that the holes in the side wall (64) of the nozzle (19) are in the form of longitudinally spaced holes formed in each of the longitudinal side walls (62) of the nozzle.
3. A method as claimed in claim 2, further characterized in that the holes (64) are in the form of elongated slots.
4. A method as claimed in claim 3, further characterized in that the grooves (64) are closely spaced so as to promote substantially continuous streams of molten metal curtain jetting the casting puddle (68) from the holes in the groove. adjacent (64) of the delivery nozzle.
5. A method as claimed in claims 4, further characterized in that the sindex fold (61) of the delivery nozzle (19) is supplied with molten met in one or more free fall streams (65).
6. A method as claimed in the claim is further characterized in that the molten metal is supplied to the delivery nozzle (19) in a series of free-fall discrete streams (65) spaced apart from the syncline fold as a choke. s:: re the floor (63) of the union fold (61) in location aligned laterally with spaces between the lateral holes (64) of the nozzle.
7. A method as claimed in claims 1 to 5, further characterized by straight barrel walls (84) comprising a pair of laterally spaced-apart walls from the floor of the synclinal fold extending continuously along the sinclin fold to define a inner channel (85) to receive the inflow of molten metal.
8. The apparatus for melting the metal strip comprising a pair of parallel casting cylinders (16) forming a retention point (69) therebetween; an elongate metal delivery nozzle (19) positioned above and extending along the retention point (69) between the casting cylinders (16) to send the molten metal to the holding point and a distributor (18) placed on top of the delivery nozzle (19) for supplying the molten metal to the delivery nozzle, characterized in that the metal delivery nozzle (19) comprises an elongated up-hole fold (61) having a floor ( 63) and side walls (62) extending longitudinally to the retaining point (69) to receive the molten metal from the distributor (18); the delivery nozzle (19) is provided with the side exit holes (64) in the longitudinal side walls (62) of the syncline (61) for the flow of the molten metal outwardly from the base of the delivery nozzle (19). ); the lower floor (63) of the synclinal fold (61) is provided with straight barrier walls (84) adjacent to the holes in the side wall (64) and the distributor (18) can be operated to send the molten metal down in the syncline fold between the flow barrier walls (84) to collide on the syncline floor (63) and flow outwardly against the barrier walls (84).
9. The apparatus as claimed in claim 9, further characterized in that the lateral exit holes (64) of the nozzle (19) are in the form of longitudinally spaced holes formed in each of the longitudinal side walls of the nozzle.
10. The apparatus as claimed in claim 9, further characterized in that the side exit holes (64) are in the form of elongated slots.
11. The apparatus claimed in claim 10, further characterized in that the grooves (64) are closely spaced to substantially promote the continuous curtain jet streams of the molten metal in the melting puddle (68) from the adjacent grooves ( 64) of the delivery nozzle.
12. The apparatus claimed in any of claims 8 to 11, further characterized in that the distributor (19) is such that it supplies the molten metal to the syncline of the delivery nozzle in one or more of the streams of free fall (65).
13. The apparatus claimed in claim 12, further characterized in that the distributor (19) is provided with a series of outlet holes (64) to produce a series of discrete free fall streams (65) of the molten metal spaced apart longitudinally. of the synclinal fold (61) so as to hit the floor (63) of the synclinal fold in laterally aligned locations with spaces between the lateral exit holes (64) of the nozzle.
14. The apparatus as claimed in any of claims 8 to 13, further characterized in that the straight barrier walls (84) comprise a pair of straight barrier walls (84) stopped from the floor (63) of the synclinal fold (61). ) and extend continuously along the synclinal fold to define an internal channel (85) to receive the inflow of the molten metal.
15. A delivery nozzle for sending the molten metal to the tape melter comprising an elongated up-hole syncline fold (61) having a floor (63) and side walls (62) extending longitudinally to receive the metal melted the delivery nozzle is provided with the side exit holes (64) in the longitudinal side walls (62) of the syncline fold for the flow of the molten metal outward from the base of the delivery nozzle, which is characterized in that the floor ( 63) of the synclinal fold is provided with straight barrier walls (84) adjacent to the side exit holes (64) to facilitate the molten metal being sent down into the synclinal fold (61) between the flow barrier walls (64). 84) to hit the floor (63) and flow outward against the barrier walls (84).
16. A delivery nozzle as claimed in claim 15, further characterized in that the lateral exit holes (64) of the nozzle are in the form of longitudinally spaced holes formed in each of the longitudinal side walls (62) of the nozzle .
17. A delivery nozzle as claimed in claim 16 is further characterized in that the side exit holes (64) are in the form of elongated slots.
18. A delivery nozzle as claimed in claim 17, further characterized in that the grooves (64) are closely spaced to substantially promote the continuous curtain jet streams of the molten metal from the adjacent slots of the delivery nozzle.
19. A delivery nozzle as claimed in any of claims 15 to 18, further characterized in that the straight barrier walls (84) comprise a pair of laterally spaced walls that rise from the floor (63) of the synclinal fold. (61) and extend continuously along the synclinal fold to define an internal channel (85) to receive the inflow of the molten metal (65).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPO4342A AUPO434296A0 (en) | 1996-12-23 | 1996-12-23 | Casting metal strip |
AUP04342 | 1996-12-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
MX9710390A MX9710390A (en) | 1998-06-30 |
MXPA97010390A true MXPA97010390A (en) | 1998-10-30 |
Family
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