EP0733420B1 - Modular mould for continuous casting - Google Patents

Abstract

The mould with a cylindrical mould space (10) is characterised by the following facts: (a) the mould elements (20,30) are detachably joined to one another by insertion of the inner sleeve (3) into the carrier structure (20); (b) the opposing sides of the sleeve and/or the carrier structure are shaped so that - when joined to one another - an annular space (32) located concentrically around the mould axis (m) is formed to constitute a second coolant chamber. Also claimed is a method for producing ingots with use of the proposed mould.

Description

The present invention relates to a mold for the continuous casting of rolled or pressed bars containing a cylindrical mold cavity with an inflow and a Outlet opening, means for evenly applying coolant to the surface of the Rolled or pressed ingot after it emerges from the mold cavity and two closed annular mold elements with a common concentric central axis, the mold axis, a mold element, the inner sleeve, with respect to the The mold axis is on the inside and laterally delimits the cylindrical mold cavity, and the other mold element, the support body, lies on the outside with respect to the mold axis and receives the inner sleeve, the inner sleeve detachable by pushing it into the supporting body is connected to this and after joining the mold elements between Inner sleeve and support body a ring-shaped concentric with respect to the mold axis Cavity, the second coolant chamber, is formed for receiving coolant.

The invention further relates to a method for producing rolled or pressed bars a metal or a metal alloy by continuous casting with a mold according to the invention.

Coolable molds for the continuous casting of molten metals for the production of Ingots or bolts as primary material for their further processing by, for example Extrusion presses or rollers are known per se.

The molds known from the prior art for the continuous casting of molten materials Metals by means of a coolable, shaping mold essentially consist of one coolable metal ring with an inlet and outlet opening, the metal ring usually a cylindrical or frustoconical mold cavity encloses.

DE-OS 24 54 166 describes a mold for continuous, vertical continuous casting of copper alloys, the mold of one Cooling jacket is surrounded.

Chill molds for the production of rolled or pressed bars with homogeneously distributed, primary solidified solid particles, which consist of individual degenerate dentrites known for example from the patents DE 30 06 588 and DE 30 06 618.

In continuous casting, especially in the continuous casting of thixotropic metal alloys, the inner walls of the molds exposed to the continuous casting material are of high height Exposed to abrasion. In addition, the continuous casting leads to a high temperature and Pressure load on the mold, so that the mold can be used for Achieving the desired bar or bolt shape optimal shape through thermal and can lose mechanical influences. To achieve a constant The metal bolts or bars used as primary material must always be of product quality have the same cross-sectional dimensions. The required high dimensional accuracy of the Because of ingots used as primary material, the previously known molds must be in short Production intervals are replaced, whereby - due to the necessary Removal of the entire mold from the continuous casting facility - a high time, material and Costs result.

The object of the present invention is therefore to create a mold for continuous casting of metals or metal alloys for the production of rolled or pressed bars, which Avoids disadvantages described above and the inexpensive manufacture of rolling or Press bars with constant bar or bolt cross-section enabled. Another job The present invention also consists in specifying a method for the production of rolled or pressed bars using such a cost-saving mold.

According to the invention, the object relating to the mold is achieved in that the inner sleeve essentially a hollow cylindrical body with a terminal end on the inflow side molded, outwardly projecting, annular flange, the support body a has an annular rib formed on the outlet side and protruding against the mold cavity, the inner sleeve and the support body are designed such that the inner sleeve in inserted state is positively attached to the rib on the outlet side and on the inflow side the flange has a positive fit on the wall of the supporting body directed against the inner sleeve comes to rest, the second coolant chamber through the flange, the rib, the wall of the support body directed against the inner sleeve and that against the support body directed wall of the inner sleeve is limited, and the means for uniform Applying coolant to the surface of the rolled or pressed ingot after it has emerged from the mold cavity from a plurality of machined into the annular rib Secondary coolant channels exist, on the one hand with the second coolant chamber in Stand connection and on the other hand obliquely on the surface of the emerging from the mold Rolling or pressing bars are aimed.

The mold according to the invention has two mold elements with different functions on. The annular inner sleeve is used to shape the continuous casting material and provides thus the part of the mold that is exposed to high abrasion and pollution is. The ring-shaped support body takes on its essentially cylindrical shape Cavity on the inner sleeve and gives the mold the necessary for continuous casting mechanical stability.

Both mold elements expediently have a substantially hollow cylindrical shape Shape up. The cross section of the mold cavity can be, for example, any one represent the area enclosed by a closed, convex curve. Is preferred the cross-sectional area is enclosed by a circle or a convex polygon.

The two-part structure of the mold according to the invention thus allows the replacement of only one mold element, namely that which has a high abrasion or pollution is exposed. In addition, the mold according to the invention allows the expansion of the soiled mold parts for easier cleaning without removing the whole mold from the mold Having to remove the continuous casting device and thus enables considerable cost savings compared to the use of molds known from the prior art.

The mold according to the invention is expediently mechanically complex Means to be produced, for example for taking up and introducing coolant or lubricant in the support body, since this usually has a much longer life than the inner sleeve.

The mold according to the invention is suitable, for example, for horizontal or vertical Continuous casting of molten metals, preferably light metals and in particular of aluminum or aluminum alloys. All commercially available are particularly suitable for this Aluminum alloys and aluminum of all purity levels.

The mold according to the invention is particularly preferred for the continuous casting of metal alloys for the production of rolled or pressed bars with homogeneously distributed primarily solidified solid particles, which consist of individual degenerate dentrites, are used. Such rolled or pressed bars, which serve as primary material, show after they have been heated to a temperature between the corresponding solidus and liquidus temperature the metal alloy, thixotropic properties. The metal alloys of such rolling or Press bars in the thixotropic state contain the reverse developed dentritic, primary solid particles in a matrix of liquid metal surrounding them. For achievement for example, good casting, rolling and finished part properties have rolled or pressed bars, which are further processed in the thixotropic state, preferably a homogeneously distributed fine and isotropic grain, the degenerate dentrites preferably being globulistic Show shape.

The support body of the mold according to the invention can be made of any material which the mold has sufficient mechanical and thermal strength as well as sufficient Dimensional stability, exist. Metals or Metal alloys and in particular aluminum or its alloys are used. All the support body preferably consists of AlMgSi alloys.

The inner sleeve preferably consists of aluminum or its alloys or copper or its alloys. The inner sleeve is very preferably made of AlMgSi alloys. In A further preferred embodiment of the mold according to the invention consists of the inner sleeve made of aluminum or an aluminum alloy and points against the mold cavity directed surface on a graphite layer or a graphite ring.

The dimensions of the mold according to the invention depend, for example, on the desired ones Final dimensions of the rolled or pressed bars. The length of the mold cavity or the length of the inner sleeve is, for example, 2 to 20 cm, expediently 2 to 10 cm and preferably between 3 and 6 cm. The length of the support body is, for example 3 to 25 cm, preferably 3 to 15 cm and preferably between 4 and 8 cm. The The diameter of the mold cavity is, for example, 3 to 20 cm, advantageously 4 to 15 cm and preferably between 6 and 15 cm. The outer diameter of the body is not critical in itself; for example, it is 8 to 25 cm, advantageously 9 to 20 cm and preferably between 11 and 18 cm.

The mold elements are releasably connected to one another. The joining of the two mold elements happens by inserting the inner sleeve into the support body, the inner sleeve is preferably inserted essentially completely into the supporting body. Prefers the releasably joined mold elements have a density compared to liquid media Connection on.

The inner sleeve on the side facing the support body and / or the support body on the the side facing the inner sleeve are such that after the assembly of the two mold elements between the inner sleeve and support body with respect to the mold axis concentric, annular cavity, the so-called second coolant chamber for the absorption of coolant occurs. This second coolant chamber enables cooling the inner sleeve, as a result of which the surface of the inner sleeve facing the mold cavity, the so-called inner surface of the inner sleeve, as a cooling surface for the during Continuous casting is used as continuous casting material. For the best possible heat flow between the continuous casting material to be cooled and that in the second coolant chamber To ensure the coolant present has the substantially hollow cylindrical The inner sleeve expediently has a thin wall thickness.

The support body for receiving coolant preferably contains one with respect to the mold axis concentric, annular cavity, the so-called first coolant chamber, and means for the supply of coolant from an external coolant supply in the first coolant chamber, the first and second coolant chambers being connected to one another via a or a plurality of connecting channels or an annular ring which is concentric with respect to the mold axis Connection opening are connected. The connection channels can for example represent holes in the supporting body. The annular connection opening will preferably by an annular groove-shaped recess concentric with respect to the mold axis formed in the support body, the annular groove-shaped recess at least partially forms the annular connection opening and is designed such that it has a Through-holes provided ring-shaped body, the so-called coolant distributor ring, can record. The ring-shaped body is, for example, one with through holes provided metal ring. The annular groove-shaped recess is preferably formed such that the surface of the mold directed into the mold cavity is shaped like an annular groove Recess used coolant distributor ring flush with the inner surface of the Completes the body. In a particularly preferred embodiment, two close Adjacent through holes of the coolant distributor ring, in the cross section of the Coolant distributor ring considered, the same central angle with respect to the mold axis on. This is very particularly preferably two with respect to the mold axis Through holes included central angle 6 to 12 °. The angle specifications relate to this in the present text always on a full circle of 360 °.

The support body preferably has at least one, preferably 1 to 4, coolant channels through which the first coolant chamber with the inflow end face of the support body connected to the external coolant supply. With inflow side The end face is the side of the support body facing the inflow opening.

In a particularly preferred embodiment of the mold according to the invention, the Carrier body on the side facing the mold cavity preferably a cylindrical Inner surface, at the end of which is directed towards the mold cavity, annular rib is formed. The inner sleeve particularly preferably represents a hollow cylindrical one Part with an annular flange formed on the inflow end, wherein the annular flange is directed against the support body and the hollow cylindrical Part of the inner sleeve on the rib of the support body and the annular flange on the cylindrical inner surface of the support body comes to rest, so that through the inner sleeve and the annular body enclosed by the support body, the second coolant chamber forms.

The height of the flange and the height of the rib is preferably selected such that the Inner surface of the inner sleeve represents a straight cylinder surface, the cylinder axis with the The mold axis coincides.

In a further preferred embodiment of the mold according to the invention, the second coolant chamber means for uniform coolant application to the surface of the rolled or pressed ingot after it emerges from the mold cavity. Prefers are the means for uniform coolant application to the surface of the Rolled or pressed bars from a large number, preferably 40 to 70, of secondary coolant channels, which are connected on the one hand to the second coolant chamber and on the other hand at an angle to the surface of the rolled or pressed ingot emerging from the mold are directed.

The secondary coolant channels are particularly preferably arranged radially uniformly, so that viewed in the mold cross-section with respect to two adjacent secondary coolant channels enclose the same central angle of the mold axis, the central angle, based on a full circle of 360 °, preferably between 5 and 10 °.

In a further preferred embodiment of the mold according to the invention, the Mold elements Means for the supply of lubricant to the end face of the inflow Inner sleeve on. The inner sleeve particularly preferably faces the support body Side and / or the support body on the side facing the inner sleeve with respect the mold axis concentric, annular groove-shaped recess, so that after the Joining the two mold elements into an annular cavity, the lubricant distributor ring, is formed to hold lubricant. The is particularly preferred annular groove-shaped inlet and outlet side with annular sealant, sealed between the inner sleeve and the support body. All the support body particularly preferably have on the side facing the inner sleeve and / or the inner sleeve on the inflow and outflow side facing the support body to the lubricant distributor ring on annular groove-shaped recesses arranged in this way are that after joining the two mold elements, annular cavities arise in which the sealing means, for example sealing rings, are introduced can.

The lubricant distributor ring is preferably over a large number, preferably 15 to 30, of lubricant channels let into the inner sleeve with the inflow end face of the Inner sleeve in connection, and the lubricant distributor ring is connected to at least one, preferably 1 to 4, lubricant filling channels embedded in the supporting body for the supply of lubricant from an external lubricant supply, the Connection of the lubricant filling channel to the external lubricant supply is preferred happens on the inflow end face of the support body. Very particularly preferred close - viewed in a cross section through the inner sleeve - two neighboring ones Lubricant channels with respect to the mold axis each have the same central angle, whereby the central angle is preferably 10 to 30 °.

The inflow-side end face of the inner sleeve further preferably has an annular groove-shaped recess on, the so-called lubricant outlet ring, which connects the to the inflow Connects end face of the inner sleeve opening lubricant channels. This Lubricant outlet ring has the task of further distributing the lubricant radially to improve.

To ensure a favorable lubricant distribution on which the continuous casting material receiving inner surface of the inner sleeve has the inner sleeve in a further preferred Embodiment of the mold according to the invention on its inner surface lubricant guide on. These lubricant guiding means can, for example, essentially Represent grooves running parallel to the mold axis. The grooves are expedient designed such that they are in the direction of the groove depth and groove width Widen the outlet opening conically. So that the lubricant is not essential Portion flows away through the lubricant guide means without the remaining inner surface of the To lubricate the inner sleeve, the lubricant guide means preferably do not begin immediately at the inflow opening, i.e. the lubricant guide means start in a preferred one Embodiment of the mold according to the invention - in the flow direction of the continuous casting material considered - only after a certain distance, for example 1/4 to 1/3 of the length corresponds to the mold cavity. The number of grooves required depends, for example of the continuous casting material, the lubricant, the continuous casting parameters and the size of the Mold cavity and is expediently 100 to 300, preferably 150 to 200 Grooves.

With regard to the method, the object according to the invention is achieved in that a molten metal or a molten metal alloy, the continuous casting material, through the mold cavity of the inner sleeve of the mold according to the invention guided and continuously lubricant to the inflow end face of the inner sleeve is passed, the lubricant flowing from the inlet opening Continuous casting material continuously recorded and thus a continuous lubrication of the the entire inner surface of the inner sleeve is ensured, the continuous casting material on the Inner surface of the inner sleeve is subjected to primary cooling, so that from the Rolling or pressing bars emerging from the mold at least in its outer edge zone in is in solid form and the rolled or pressed ingot after it has left the Chill according to the invention by secondary cooling by means of coolant is further cooled.

The method according to the invention is particularly suitable for horizontal or vertical Continuous casting of aluminum or its alloys, aluminum of all purity levels and all commercially available aluminum alloys come into question.

The method according to the invention is preferred for the production of rolled or pressed bars with homogeneously distributed, primarily solidified solid particles that consist of individual degenerate For example, there are globulistic dentrites used, the continuous casting material is vigorously stirred at least in the entire solidification zone.

For the production of rolled or pressed bars with homogeneous, primarily solidified ones Solid particles consisting of individual degenerate dentrites are suitable, for example Aluminum, magnesium or zinc alloys and in particular AlSi, AlSiMg, AlSiCu, AlMg, AlCuTi and AlCuZnMg alloys.

The molten continuous casting material is, for example, by means of an inlet nozzle at least partially forms a ceramic sleeve, introduced into the mold according to the invention. Essential for the production of rolled or pressed bars with homogeneously distributed, this is primarily solidified solid particles, which consist of individual degenerate dentrites vigorous stirring of the continuous casting material, for example already in part of this ceramic sleeve, as well as in the whole consolidation zone, i.e. in the entire mold cavity and the area of the rolling or press ingot in which a part of the alloy is still in the molten state

The molten continuous casting material is preferably stirred by an electromagnetic one Stirring device that generates a magnetic field rotating around the mold axis. The stirring is particularly preferably carried out by means of a stator of a multi-pole, for example two, four, or in particular six-pole induction motor.

The present invention is further explained by way of example with reference to FIGS. 1 to 3.

Figure 1 shows a plan view of the inflow-side part of the mold according to the invention.

FIG. 2 shows a longitudinal section through the mold along the mold axis the line B-B according to FIG. 1.

Figure 3 shows a longitudinal section of the mold along the line A-A of Figure 1 and shows thus a mold longitudinal section, on the one hand through a lubricant filling channel and on the other runs through a coolant channel.

Figure 1 shows the top view of the inflow-side part of a mold according to the invention horizontal or vertical continuous casting of rolled or pressed bars. The top view shows the inflow-side end faces of the mold elements releasably connected, the Support body 20 and the inner sleeve 30, wherein the two mold elements 20, 30 a concentric Have center axis, the so-called mold axis m, and with respect to this show a rotationally symmetrical cross section. The top view also shows the circular one Inflow opening 12 of the mold cavity 10. The inner sleeve 30 is detachably connected Condition of the mold elements 20, 30 - at least partially - directly on the inner surface 16 of the supporting body 20, the inflow-side end face 48 of the inner sleeve 30 is set back with respect to the inflow end face of the support body 20, so that a cavity, the nozzle recess 28, is formed, in which a - not shown - Cuff, for example made of ceramic material, an inlet nozzle for the through the Chill mold can be inserted in a form-fitting manner. The cuff the inlet nozzle becomes tight with the inflow-side end face 48 of the inner sleeve added, so that no continuous casting material between the inner surface during the continuous casting 16 of the support body 20 and the sleeve of the inlet nozzle can emerge.

The support body 20 shown in Figure 1 has two coolant channels 21 for introducing Coolant in the first coolant chamber 22, the two coolant channels 21 in Include cross-section with respect to the mold axis m a central angle of 180 °. The Coolant channels 21 connect the first coolant chamber 22 to the inflow end face of the support body 20. The coolant channels 21 have a circular top view Opening and run parallel to the mold axis m into the interior of the support body 20th figure 1 further shows the opening of a lubricant filling channel 43 located in the carrier body 20, which in cross section with respect to the mold axis m with the coolant channels 21 has a central angle of 90 ° (right angle). The lubricant filling channel 43 has in the Top view of a circular opening and runs parallel to the mold axis m inside of the supporting body 20.

The top view of a mold according to the invention shown in FIG. 1 further shows the inflow side Openings of a plurality of lubricant channels 42 and a lubricant outlet ring 41. The inflow-side openings of the lubricant channels 42 are uniform distributed over the front of the support body, i.e. two adjacent lubricant channels 42 close seen in cross section, with respect to the mold axis m, always the same central angle on. The lubricant outlet ring 41 provides an annular groove-shaped recess in the inflow-side end face 48 of the inner sleeve 30, which from the lubricant channels 42 escaping lubricant collects and evenly over the entire lubricant outlet ring 41 distributed. The lubricant is removed during the continuous casting process the mold cavity 10 flowing continuous casting material detected, thereby creating a uniform thin film of lubricant between the continuous casting material and the inner surface 46 of the inner sleeve 30 is formed.

FIG. 2 shows a longitudinal section of the mold running through the mold axis m the line B-B according to FIG. 1. The inner sleeve is detachably connected to the supporting body 20 30 shown. The of the inner surface 46 of the inner sleeve 30 and the inflow and Outlet openings 12, 14 enclosed space forms the cylindrical mold cavity 10. The support body 20 lies with respect to the mold cavity 10 on the outside and the inner sleeve 30 inside.

The carrier body 20 contains an annular, concentric with respect to the mold axis m first coolant chamber 22 through at least one coolant channel 21 for introducing the Coolant in the first coolant chamber 22 with the inflow-side surface of the support body 20 is connected.

The inner sleeve 30 is on the side facing the support body 20 such that after joining the two mold elements 20, 30 between the inner sleeve 30 and Support body 20 a ring-shaped, second, concentric with respect to the mold axis m Coolant chamber 32 is formed, which with the first coolant chamber 22 via a coolant distributor ring 26 is connected.

The coolant distributor ring 26 provides a metal ring designed as a separate mold element with a plurality of through holes 27, with two adjacent through holes 27 viewed in cross section with respect to the mold axis m the same Include central angle. The support body 20 has the mold cavity on it facing side an annular groove-shaped recess concentric with the mold axis m which at least partially has an annular connection opening with the first Has coolant chamber 22. The annular groove-shaped recess serves to receive the Through holes 27 provided coolant distributor ring 26. The annular groove The recess and the coolant distributor ring 26 are configured such that the coolant distributor ring 26 in a form-fitting manner in the annular groove-shaped recess of the supporting body 20 fits, i.e. that the inner surface of the coolant distribution ring 26 is flush with the inner surface 16 of the support body 20 closes. To insert one from one with through holes 27 provided metal ring existing coolant distributor ring 26 in the annular groove The coolant distributor ring 26 can be cut open at one point, for example be so that the coolant distributor ring 26 for insertion into the annular groove Elastic recess can be deformed.

The inner sleeve 30 has on the side facing the support body 20 with respect to the Chill axis m annular groove-shaped recess, which in cooperation with the Mold cavity 10 facing side of the support body 20 an annular cavity, forms the lubricant distributor ring 40 for receiving lubricant. The lubricant distributor ring 40 is with a lubricant filling channel embedded in the support body 20 43 connected. The lubricant distributor ring 40 thus serves for the radial distribution of the lubricant flowing through the lubricant filling channel 43. This lubricant distributor ring 40 also stands over a multiplicity of lubricant channels let into the inner sleeve 30 42 with the inflow-side end face 48 of the inner sleeve 30 in connection, see above that the lubricant located in the lubricant distribution ring 40 by the radial, for example uniform, distributed lubricant channels 42 in the on the inflow End face 48 of the inner sleeve 30 located lubricant outlet ring 41 can flow. The Lubricant channels 42 are preferably arranged such that in a mold cross section considers two adjacent lubricant channels 42 with respect to the mold axis m in each case include the same central angle. The lubricant is in the lubricant outlet ring 41 radially evenly distributed again. During the continuous casting process, this will Lubricant exit ring 41 located lubricant from the continuous casting material flowing past continuously captured, so that between continuous casting material and the inner surface 46 of the inner sleeve 30 forms a thin lubricant film.

The from the annular groove-shaped recess of the inner sleeve 30 and the inner surface 16 of the Carrier body 20 formed lubricant distributor ring 40 is on the inflow and outlet side with annular sealing means 44, which between the inner sleeve 30 and the support body 20 to come to rest, sealed, i.e. on both sides for the formation of the lubricant distribution ring 40 necessary, annular groove-shaped recess of the inner sleeve 30, the inner sleeve parallel to the lubricant distribution ring 40, perpendicular to the mold axis, have further annular groove-shaped recesses which - for example together with corresponding recesses in the support body 20 - for receiving annular sealing means 44, such as sealing rings, serve.

The inner sleeve 30 also has on its inner surface 46 extending parallel to the mold axis m Grooves 50, wherein the grooves 50 with respect to their groove depth and groove width in Expand conically in the direction of the outlet opening 14. These grooves 50 serve essentially for guiding the lubricant in the exit-side area of the mold cavity 10, i.e. they are used to distribute the lubricant evenly. So that the lubricant does not flow away to a substantial extent through the grooves 50 without an even flow over the To form the inner surface 46 of the distributed lubricant film, those incorporated into the inner sleeve begin Grooves 50 in the flow direction of the continuous casting material only after a certain distance, for example 1/4 to 1/3 of the length of the mold cavity 10 or the inner sleeve 30 corresponds.

The support body 20 has a cylindrical shape on the side facing the mold cavity Inner surface 16, to the one at the exit end against the mold cavity 10 directed, annular rib 18 is formed. The inner sleeve 30 has a hollow cylindrical shape Part 34 with an annular flange 36 formed on the inflow end on, wherein the annular flange 36 is directed against the support body 20. The ring-shaped Flange 36 contains the lubricant channels 42 and for the creation of the lubricant distribution ring 40, the lubricant outlet ring 41 and the one for receiving the Sealing means 44 required annular groove-shaped recesses. The hollow cylindrical part 34 of the inner sleeve 30 has in the outlet-side area directed against the support body Side a further annular groove-shaped recess, the stop 39. This is used for positive reception of the outer area protruding against the mold cavity 10 the annular rib 18 of the support body 20th

The two mold elements 20, 30 are expediently joined together by inserting the inner sleeve 30 into the support body 20, the one on the outlet side Area of the inner sleeve 30 lying, annular stop 39 form-fitting in the outer Area of the annular rib 18 of the supporting body which projects against the mold cavity 10 20 takes hold. When the mold elements 20, 30 are pushed into one another, the hollow cylindrical part 34 of the inner sleeve 30 on the annular rib 18 and the molding 38 of the annular flange 36 on the cylindrical inner surface 16 of the support body 20 to lie, so that the enclosed by the inner sleeve 30 and the support body 20 annular cavity the second coolant chamber 32 forms the height of the flange 36 and the height of the annular rib 18 are chosen such that the inner surface 46 of the inner sleeve 30 represents a straight cylinder surface, the cylinder axis of which is with the mold axis m coincides.

The hollow cylindrical part 34 of the inner sleeve 30 serves the primary cooling of the through Mold cavity 10 flowing continuous casting material and therefore has - the good Heat dissipation from the continuous casting material to the coolant because - preferably one thin wall thickness. Preferably there is at least the hollow cylindrical part 34 of the inner sleeve 30 made of a good heat-conducting material, preferably copper, copper alloys, Aluminum or aluminum alloys. Hollow cylindrical parts are further preferred 34 made of aluminum or aluminum alloys, which on the facing the mold cavity Side have a graphite ring.

The annular rib 18 of the supporting body 20 also has a multiplicity, for example 40 to 60, of secondary coolant channels directed obliquely at the billets emerging from the mold 24 on, which are in communication with the second coolant chamber 32 and for Secondary cooling by applying coolant to the rolling or press ingot after it Exit exit opening 14 serve.

Figure 3 shows a longitudinal section of the mold along the line A-A of Figure 1 and shows thus a mold longitudinal section, on the one hand through a lubricant filling channel 43 and on the other hand, runs through a coolant channel 21. In this longitudinal section are next to the features already shown in Figure 2, a coolant channel 21 for introducing the coolant into the first coolant chamber 22 and the lubricant filling channel 43 for introducing Lubricant shown in the lubricant distributor ring 40.

The mold according to the invention can be used to manufacture conventional rolled or pressed bars by continuous casting of molten metal alloys or for the production of Rolled or pressed bars with homogeneously distributed, primarily solidified solid particles individual degenerate dentrites exist. The mold according to the invention allows the inner sleeve to be replaced quickly, i.e. replacing only that of abrasion and Part of the mold exposed to contamination, which reduces the manufacturing costs of rolling or pressed bars compared to those with molds known from the prior art manufactured rolled or pressed bars can be significantly reduced.

Claims (18)

1. Mould for the continuous casting of slabs or extrusion ingots containing a cylindrical mould cavity (10) with an inlet opening (12) and an outlet opening (14), means (24) for the uniform application of coolant to the surface of the slab or extrusion ingot once it emerges from the mould cavity (10) and two closed annular mould elements (20, 30) with a common concentric centre axis, i.e. the mould axis (m), one mould element, i.e. the inner sleeve (30), being situated on the inside relative to the mould axis (m) and laterally delimiting the cylindrical mould cavity (10), and the other mould element, i.e. the supporting body (20), being situated on the outside relative to the mould axis (m) and receiving the inner sleeve (30), the inner sleeve (30) being releasably connected to the supporting body (20) by inserting it therein, and an annular cavity concentric with the mould axis (m), i.e. the second coolant chamber (32), for receiving coolant being formed between the inner sleeve (30) and the supporting body (20) once the mould elements (20, 30) are joined together, characterised in that the inner sleeve (30) is a substantially hollow cylindrical body with an outwardly projecting annular flange (36) moulded on at the inlet end, the supporting body (20) has an annular rib (18) projecting towards the mould cavity (10) moulded on at the outlet end, the inner sleeve (30) and the supporting body (20) are designed in such a manner that the inner sleeve (30) is positively secured to the rib (18) at the outlet end in the inserted state and the flange (36) comes to bear positively against the wall of the supporting body (20) directed towards the inner sleeve at the inlet end, the second coolant chamber (32) being delimited by the flange (36), the rib (18), the wall of the supporting body (20) directed towards the inner sleeve (30) and the wall of the inner sleeve (30) directed towards the supporting body (20), and the means for the uniform application of coolant to the surface of the slab or extrusion ingot once it emerges from the mould cavity (10) consist of a plurality of secondary coolant channels (24) worked into the annular rib (18), on the one hand, connected to the second coolant chamber (32) and, on the other hand, directed at an incline relative to the surface of the slab or extrusion ingot emerging from the mould.
2. Mould according to claim 1, characterised in that the supporting body (20) contains an annular cavity concentric with the mould axis (m), i.e. the first coolant chamber (22), for receiving coolant, and means (21) for supplying coolant from an external coolant supply to the first coolant chamber (22), the first and second coolant chambers (22, 32) being connected together by means of one or more connecting channels (27) or an annular connecting opening concentric with the mould axis.
3. Mould according to claim 2, characterised in that the annular connecting opening is formed by an annular groove-shaped recess in the supporting body (20) concentric with the mould axis (m), the annular groove-shaped recess at least partially forming the annular connecting opening and being designed in such a manner that it can receive an annular body provided with through bores (27), i.e. the coolant distributor ring (26).
4. Mould according to claim 2, characterised in that the supporting body (20) has at least one, preferably 1 to 4, coolant channels (21) by means of which the first coolant chamber (22) is connected to the inlet end face of the supporting body (20) for connection to the external coolant supply.
5. Mould according to claim 1, characterised in that the means for the uniform application of coolant to the surface of the slab or extrusion ingot once it emerges from the mould cavity (10) consist of 40 to 70 secondary coolant channels (24).
6. Mould according to claim 5, characterised in that the secondary coolant channels (24) are arranged in a radially uniform manner, so that, when the mould is viewed in cross section, two adjacent secondary coolant channels (24) enclose the same central angle relative to the mould axis (m), the central angle preferably being between 5 and 10° in relation to a full circle of 360°.
7. Mould according to claim 1, characterised in that the supporting body (20) and the inner sleeve (30) have means (40, 41, 42, 43) for supplying lubricant to the inlet end face (48) of the inner sleeve (30).
8. Mould according to claim 7, characterised in that the inner sleeve (30) is provided on the side directed towards the supporting body (20) and/or the supporting body (20) is provided on the side directed towards the inner sleeve (30) with an annular groove-shaped recess concentric with the mould axis (m), such that an annular cavity, i.e. the lubricant distributor ring (40), for receiving lubricant is formed when the two mould elements (20, 30) are joined together.
9. Mould according to claim 8, characterised in that the lubricant distributor ring (40) is sealed at the inlet and outlet ends by annular sealing means (44) coming to bear between the inner sleeve (30) and the supporting body (20).
10. Mould according to claim 8, characterised in that the lubricant distributor ring (40) is connected by means of a plurality of lubricant channels (42) formed in the inner sleeve (30) to the inlet end face (48) of the inner sleeve (30) and the lubricant distributor ring (40) is connected to at least one, preferably 1 to 4, lubricant feed channels (43) formed in the supporting body (20) for supplying lubricant from an external lubricant supply, the connection of the lubricant feed channel (43) to the external lubricant supply preferably being effected at the inlet end face of the supporting body (20).
11. Mould according to claim 10, characterised in that, when viewed in cross section through the inner sleeve (30), two adjacent lubricant channels (42) each include the same central angle of preferably 10 to 30° in relation to a full circle of 360° relative to the mould axis (m).
12. Mould according to claim 10, characterised in that the inlet end face (48) of the inner sleeve (30) has an annular groove-shaped recess, i.e. the lubricant outlet ring (41), which connects together the lubricant channels (42) opening into the inlet end face (48) of the inner sleeve (30).
13. Mould according to claim 1, characterised in that the inner sleeve (30) is provided on its inner surface (46) with lubricant guide means (50) preferably extending parallel to the mould axis (m).
14. Mould according to claim 13, characterised in that the lubricant guide means (50) constitute grooves (50) extending parallel to the mould axis (m), not beginning at the inlet end until after a distance of 1/4 to 1/3 of the length of the mould cavity (10) and preferably flaring out towards the outlet opening (14) with respect to the groove depth and the groove width.
15. Method for the production of slabs or extrusion ingots by continuous casting with a mould according to one of claims 7 to 14, in which a molten metal or a molten metal alloy, i.e. the continuous casting material, is guided through the shaping mould cavity (10) of the inner sleeve (30) and lubricant is fed continuously to the inlet end face (48) of the inner sleeve (30), the lubricant being received continuously by the continuous casting material flowing through the inlet opening (12), thereby ensuring continuous lubrication of the entire inner surface (46) of the inner sleeve (30), the continuous casting material on the inner surface (46) of the inner sleeve (30) being subjected to primary cooling, as a result of which the slab or extrusion ingot emerging from the mould is in solid form at least in its outer edge zone and, once it emerges from the mould, the slab or extrusion ingot is cooled further by secondary cooling by applying coolant thereto.
16. Method according to claim 15 for the production of slabs or extrusion ingots with primary solidified solid particles consisting of individual degenerated dendrites homogeneously distributed therein, characterised in that the continuous casting material is agitated vigorously at least in the entire solidification zone.
17. Method according to claim 16, characterised in that the continuous casting material is agitated by an electromagnetic agitating device which generates a magnetic field rotating about the mould axis.
18. Method according to claim 17, characterised in that agitation is effected by means of the stator of a multi-pole, e.g. two-pole, four-pole or, in particular, six-pole, induction motor.

Images