EP3171999A1

EP3171999A1 - Melting unit for melting down casting materials and method for producing molten material for casting

Info

Publication number: EP3171999A1
Application number: EP15735928.2A
Authority: EP
Inventors: Stephan Schwenkel
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-07-21
Filing date: 2015-07-06
Publication date: 2017-05-31
Also published as: US20170113270A1; WO2016012225A1; DE102014110251A1

Abstract

The invention relates to a melting unit for melting down casting materials and to a method for producing molten material for casting.

Description

Melting unit for melting casting materials and a method for producing a melt for casting

Description

The invention relates to a melting unit for melting

Casting materials and a method for producing a melt for casting.

During casting, a solid body of the casting material is formed from the melt of a cast material after it has solidified in a casting mold.

Cast materials are especially based on iron as well as

Non-ferrous metals known. Common cast iron is cast iron, an iron-carbon compound, and cast steel.

The casting of cast materials takes place in foundries. In foundries, in melting furnaces, for example in cupola furnaces, a mixture of various raw materials is first melted in the form of the desired casting material

melted. This melt can then be cast either directly or in a process-related downstream Vergießofen be transferred, which serves for storing and / or treatment and / or keeping warm the melt until it is fed to the downstream Gus forms, in which from the melt, a solid body or a casting is formed. In particular casting method using a

Vergießofens have proven themselves, as these provide a buffer between the

Preparation of the melt of Gus serkstoffes from the raw materials and the casting of the melt represent.

Basically, appropriately designed casting methods have

Although the use of potting furnaces has proven successful in practice, they also have numerous disadvantages.

Thus, for example, it can lead to performance problems in the process if too little melt is made available to the casting furnace from the melting furnace. Furthermore, for example, quality problems with respect to the melt may occur if the supply of melt from the casting furnace to the casting molds falters; because in this case it can come in the lingering for a long time in the casting furnace melt by burning to a change in the chemical composition of the melt.

Furthermore, the transport of the melt from the furnace to the casting furnace can be problematic. Because usually the melt is this purpose in suitable vessels, for example by means of a forklift, transported, which may be associated with the risk of personal injury in the event of an accident.

Furthermore, the melting and casting furnace must have a high sorption capacity, so that a sufficient buffer of the melt of the cast material is available. For example, at a typical throughput of about 10 tons of cast material per hour, furnaces have about 10 tons Fas sungsvermögen for the casting material or the

For example, underlying raw materials and Vergießöfen

Fasungsvermögen of 3 t to 10 t of molten cast material, such as a cast-iron melt, on.

According to the invention, it has been recognized that the aforementioned problems resulting from the known technology for casting cast iron materials lie, in particular, in the coupling of the melting furnace and the casting furnace to one another. The inventive idea is therefore to provide a technology with which a decoupling of furnace and

Pouring furnace is possible.

Against this background, the invention is based on the object of providing a smelting unit for melting cast iron materials and a

To provide a method for producing a melt for casting, by which a casting of Gus serkerkstoffe is possible in which the aforementioned problems no longer arise. In particular, according to the invention, a technology should be made available by which a complete decoupling of melting furnace on the one hand and

Potting oven on the other hand is possible.

According to the invention, a melting unit is provided for melting casting materials with the following features:

A first furnace vessel and a second furnace vessel;

the first furnace vessel is designed for the melting of cast iron materials and for receiving the melt formed by the melting; the second furnace vessel is connected downstream of the first furnace vessel in such a process that it is possible to conduct melt formed in the first furnace vessel made of cast materials into the second furnace vessel; the second furnace vessel is designed to receive the melt which can be conducted from the first furnace vessel into the second furnace vessel, and to raise the temperature of the received melt to its casting temperature.

Melting according to the invention is understood to mean the production of a melt from a solid material, in particular a solid cast material.

According to the invention, a cast material can be any casting material for casting, in particular a cast iron material in the form of cast iron or cast iron.

The casting temperature is the temperature of the melt of the casting material, which is desired in the furnace unit for the purpose

subsequent casting in Gus forms should have. In general, this casting temperature is overheated by a few degrees Celsius above the optimum temperature during subsequent casting, so that the casting temperature as well

Overheating temperature is called.

By the second furnace vessel Stchnisch downstream of the first furnace vessel process, it is expressed that produced during regular operation of the melting unit according to the invention in the first furnace vessel melt then passes into the second furnace vessel or is passed.

According to the invention, it was found that s with the invention

Melting unit a complete decoupling of the preparation of a melt of Gus serkstoffes from the raw materials on the one hand and the provision of such a melt for their casting in Gus forms on the other hand is possible. Because the melting unit according to the invention allows both the Melting a solid cast material and the treatment of

Melt such that it is available in particular for the casting, in particular their casting temperature. For this purpose, the melting unit according to the invention has a first furnace vessel in which first of all a melt of the casting material can be produced from the solid cast material. For the treatment of this melt such that it is present in a desired shape for casting, in particular the desired

Having casting temperature, the inventive melting unit, the second furnace vessel. A particular feature of the melting unit according to the invention is in particular also that the second furnace vessel is not only used for keeping the first furnace vessel warm

absorbed melt is formed, but to increase the

Temperature of the melt received by the first furnace vessel. Furthermore, the first and second furnace vessels are preferably formed with a relatively small volume for receiving casting material or a melt formed therefrom, since it has been recognized according to the invention that this brings numerous advantages. Thus, with a relatively small volume of the second furnace vessel, only a smaller amount of melt in the furnace assembly liquid is kept ready and consumed faster at the typical throughputs than in the state-of-the-art units. This results in a short residence time of the melt in the

furnace assembly according to the invention, in particular in the second furnace vessel.

As a result, however, the risk of a qualitative deterioration of the melt is minimized during their residence in the furnace assembly according to the invention, since due to the short residence time in particular the risk of burnup is minimized. At the same time resulting from the possible short residence time of the melt in the furnace assembly according to the invention

Possibility of a quick change between melting a

different, desired composition. Further, with a small volume of the first and second furnace vessels and the resulting resulting in shorter process times only a lower energy than in the prior art needed to a desired amount of cast material

melt and provide for casting.

The first furnace vessel has an inlet s for the entry of solid

Cast iron in the first furnace vessel. This inlet s may, for example, be an opening in the first furnace vessel. The inlet s can be closed, for example. Preferably, the inlet s of the first furnace vessel is formed in the upper region of the first furnace vessel.

For melting solid introduced into the first furnace vessel

Cast material, the first furnace vessel has a device for heating solid casting material in the first furnace vessel above its melting temperature. In principle, this device can be any device known from the prior art for

Smelt casting materials in a furnace vessel,

for example, a gas burner. However, the first furnace vessel is particularly preferably heated inductively. In that regard, the first furnace vessel as means for melting located in the first furnace vessel Gus serkstoff an induction device, in particular an induction coil, through which the first furnace vessel is heated inductively or by induction. Overall, the first furnace vessel can be designed in this respect, for example, in the form of an induction furnace. The particular advantage of such an inductively heatable first furnace vessel lies in particular in the fact that solid cast iron material contained in the first furnace vessel can be melted particularly quickly, so that the first furnace vessel can be used very flexibly for melting cast iron of desired different compositions. The first furnace vessel is designed overall such that the casting material located in the first furnace vessel can be heated to a temperature in which it melts or is present as a melt. However, the first furnace vessel need not be formed so as to be in the first furnace vessel

formable melt is heated to casting temperature. This may be advantageous insofar as the device for heating cast material in the first furnace vessel does not have to be dimensioned in such a way that it heats the material out of the casting in the first furnace vessel

located melt is necessary at casting temperature.

It may be provided, for example, that the first furnace vessel - based on a throughput of one ton of cast iron per hour - means for heating or melting of in the first furnace vessel

located casting material having an output of not more than 450 kW, that is, for example, not more 400 kW, 350 kW, 300 kW or not more than 250 kW, as far as the first furnace vessel is designed to receive a Gus serkerk material in the form of cast iron , As far as the first

Furnace vessel for receiving a cast material in the form of cast steel is designed, for example, be provided that the first furnace vessel - based on a throughput of one ton of cast iron per hour - a device for heating or melting of located in the first furnace vessel Gus sstahl with a benefit of not more than

500 kW, that is, for example, not more than 450 kW,

400 kW, 350 kW, 300 kW or not more than 250 kW. In particular, the power of the heating means may vary linearly with throughput, eg twice as high at a throughput of 2 tons per hour and half as high as the above performances at a throughput of 0.5 tons per hour. As far as the first furnace vessel is designed to receive a cast material in the form of cast iron, it may preferably be provided that the cast iron or a melt formed therefrom be in the first furnace vessel at a temperature in the range from 1 .000 ° C. to 1. 300 ° C is heated,

in particular, for example, to a temperature of at least 1 .050 ° C or 1. 100 ° C or, for example, at most also to one

Temperature of 1 .250 ° C or 1 .200 ° C. As far as the first furnace vessel for

Receiving a cast material in the form of cast steel, it may preferably be provided that the molten steel content of a melt formed therefrom in the first furnace vessel can be heated to a temperature in the range from 1,400 ° C. to 1,600 ° C., in particular So for example, to a temperature of at least 1 .450 ° C or, for example, at most also to a temperature of 1 .550 ° C.

The first furnace vessel preferably has an outlet s for discharging the melt formed in the first furnace vessel.

The first furnace vessel preferably has such an outlet on the bottom side, so that the first furnace vessel does not have to be tilted in order to discharge the melt from the first furnace vessel. This has the advantage that the first

Furnace vessel is continuously used for melting of cast materials. A, in particular bottom-side outlet of the first furnace vessel, may preferably be closable, for example by a stopper or

Slide closures, as they are known for a pan or a tundish from steel production.

The first furnace vessel may be provided on the inside at least partially by a refractory lining, in particular in the areas in which a melt from the casting material is present. According to a preferred embodiment, it is provided that the first furnace vessel has regions, in which it is not delivered on the inside by a refractory lining, in particular, for example, in the areas where no melt from the. During operation of the melting unit according to the invention

Casting material is present. A particular advantage of a first furnace vessel, which has areas where it is not on the inside by a refractory

Lined is located, is that the furnace vessel in these

Areas can be acted upon much more effectively with heating energy than at such areas that are delivered through a refractory lining, in particular, as far as the first furnace vessel is inductively heated.

The second furnace vessel has an inlet s for receiving the melt of the casting material which can be conducted from the first furnace vessel into the second furnace vessel. Such an inlet s may, for example, be an opening which, for example, may also be closable. Preferably, the opening is arranged at the top of the second furnace vessel.

To increase the temperature of the received from the first furnace vessel melt of the casting material on the sen casting temperature, the second furnace vessel has a means for heating this melt. In principle, this device can be any device known from the prior art for melting cast iron materials in a furnace vessel, for example a gas burner. Particularly preferably, however, the second furnace vessel can be heated inductively. In that regard, the second furnace vessel as a means for heating located in the second furnace vessel melt of Gus serkstoffes one

Induction device, in particular an induction coil, through which the second furnace vessel can be heated inductively or by induction. Overall, the second furnace vessel can be designed in this respect, for example in the form of an induction furnace, for example in the form of a crucible furnace, wherein the melt is inductively heated to the casting temperature. Of the The particular advantage of such an inductively heatable second furnace vessel lies in particular in the fact that the melt of the casting material located in the second furnace vessel can be heated particularly rapidly to its casting temperature.

The second furnace vessel, as stated above, preferably a

relatively small capacity for the melt of the

Cast material on. As far as the cast iron is, for example, cast iron or cast steel, the second furnace vessel has, for example, a capacity for a cast iron melt of not more than 20% of the throughput of the furnace assembly according to the invention per hour, that is to say for example not more than 15. 10 % or 5% of throughput per hour. In particular, as far as the second furnace vessel for receiving a

Cast iron melt is formed in the aforementioned scope, the

Means - based on a throughput of one ton of cast iron per hour - for heating the melt located in the second furnace vessel have a power of, for example, at most 200 kW, ie

For example, even at most 150 kW, 100 kW or at most 50 kW, As far as the second furnace vessel for receiving a Gus s molten steel is formed in the aforementioned scope, the device - based on a throughput of one ton of cast steel per hour - for heating the in the second furnace vessel melt have a power of, for example, at most 250 kW, so for example, not more than 200 kW, 150 kW, 100 kW or 50 kW at most.

As far as the second furnace vessel to increase the temperature of a

Cast iron melt is formed at casting temperature, the second

Oven vessel be designed such that the cast iron melt on a

Temperature can be heated in the range of 1 .400 ° C to 1 .600 ° C, ie

for example, to a temperature of at least 1 .450 ° and for example, even to a temperature of at most 1 .550 ° C. As far as the second furnace vessel for increasing the temperature of a cast steel melt is formed to casting temperature, the second furnace vessel may be formed such that s the casting molten steel is heated to a temperature in the range of 1 .600 ° C to 1 .700 ° C, ie for example, to a temperature of at least 1 .620 ° and for example to a temperature of

at most 1 .680 ° C.

The second furnace vessel has an outlet s for Auslas sen of the melt formed from the second furnace vessel.

On the inside, the second furnace vessel is delivered through a refractory lining, which surrounds the furnace chamber for receiving the melt.

The melt formed in the first furnace vessel is basically any means known in the art for conducting

Melting in the second furnace vessel leitbar. For example, the melt via channels, pipes or combinations thereof from the first furnace vessel in the second furnace vessel can be conducted. These means for conducting the melt may be formed, for example, of a refractory material.

Preferably, the melting unit is designed in such a way that the melt is guided by gravity from the first furnace vessel into the second furnace vessel.

In that regard, it can be particularly preferably provided that the outlet s for discharging the melt from the first furnace vessel above, that is vertically higher than the highest bath level of the melt in the second furnace vessel is arranged, ie above the inlet of the second furnace vessel, as far as the inlet s of the second Oven vessel above the highest B mirror of the melt in the second furnace vessel is arranged. This makes it possible for the melt to flow from the first furnace vessel into the second furnace vessel by gravity.

According to a preferred embodiment, provision is made for the first furnace vessel and the second furnace vessel to be arranged relative to one another such that the melt flows from the first furnace vessel into the second furnace vessel in free fall. For the realization of this inventive concept can therefore

be provided, for example, that the outlet s of the first furnace vessel is arranged above the inlet ses of the second furnace vessel, the s from the Auslas s of the first furnace vessel effluent melt

Gravity due to the inlet of the second furnace vessel flows into this.

According to a preferred embodiment, the inventive

Melting unit several first furnace vessels. These may each be formed as described herein. The advantage of a melting unit with a plurality of first furnace vessels lies in particular in the fact that the latter can be charged with solid cast materials of a different composition, so that the melts formed therefrom can be combined in the second furnace vessel to form a pourable melt, which can be used as a melt represents a combination of the compositions of the melts from the first furnace vessels.

According to one embodiment it can be provided that the

Melting unit according to the invention has a plurality of second furnace vessels. These may each be formed as described herein. The advantage of a melting unit with several second furnace vessels is

for example, in that the latter of the first furnace vessels is charged with liquid casting materials of a different composition in each case can be, for example, the different Vergießeinrichtungen can be supplied.

The second furnace vessel is preferred for conducting the in the second

Furnace furnace heated to casting temperature melt formed in a downstream process stage, for example, to line in at least one of the following process stages: a device for the treatment of the melt or a Vergießeinrichtung. As a treatment device is herein a

Device understood by the melt according to the state of

Technique is treatable. As a Vergießeinrichtung is herein a

Casting understood, which includes one or more molds stas.

Preferably, the melting unit is designed such that the s in the second furnace vessel heated to casting temperature melt without

procedural intermediate step, ie in particular, for example, without further heating of the melt, a Vergießeinrichtung is zuleitbar. According to a preferred embodiment, the melt heated in the second furnace vessel to the casting temperature can be fed by gravity to the casting device, for example via grooves or pipes. As a result, a - possibly dangerous - transport of the melt to the casting molds is not necessary.

For discharging the melt from the second furnace vessel, the second furnace vessel preferably has an outlet s.

This outlet is preferably closable, for example via a plug or a Schieberverschlus s, which may be formed according to a Schieberverschlus s or a plug for a pan or a tundish from steel production. This allows the melt from the outlet of second furnace vessel are discharged, without the melting process would have to be interrupted in the second furnace vessel.

This has the particular advantage that s tilting to Auslas sen of

Melt from the second furnace vessel is not necessary, so that s the continuous melting operation in the second casting operation must not be interrupted s.

The inventive method for producing a melt for casting with a melting unit according to the invention has the following features:

Introduction of solid cast material into the first furnace vessel;

Melting the cast material in the first furnace vessel;

Passing the melt formed in the first furnace vessel into the second one

Oven vessel;

Increasing the temperature of the melt received by the second furnace vessel to its casting temperature.

The casting material used for the process according to the invention and the melt formed therefrom can, as stated hereinbefore, be characterized by

Be treated according to the invention melt aggregate.

In that regard, the solid cast iron may preferably be in the form of cast iron or cast steel, which is initially heated in the first furnace vessel, for example, to 1 .000 ° C to 1 .300 ° C or to 1 .400 ° C to 1 .600 ° C , then in the second furnace vessel to 1 .400 ° C to 1 .600 ° C or 1 .600 ° C heated to 1 .700 ° C and finally can be forwarded from the second furnace vessel to a downstream treatment or Vergießeinheit. The process according to the invention can be part of a further process for producing the pourable melt. A central inventive idea of this further, fiction, contemporary method is that the melt - in contrast to the known from the prior art method - between the first melting of the casting material from the raw materials and the provision of a moldable melt thereof is cooled, so that s from the initially formed melt a solid cast material is formed.

In that regard, as stated above, according to the prior art, first of the raw materials, in particular pig iron and scrap, a Gus seisen- or cast steel melt created a desired composition that is either immediately shed or in liquid-state then fed to a downstream Vergießofen, from where it is fed to the Vergießeinheiten. According to the state of the art, therefore, the melt formed from the raw materials always remains in a molten state between its melting and pouring.

According to the method of the invention, however, initially a melt of a casting material of a desired from the raw materials

Formed composition, which can then be cooled les st. This cooled casting material is then melted down in the first furnace vessel of the melting unit according to the invention.

The further method according to the invention accordingly has the following further steps preceding the method described above:

Creating a melt of a cast material;

Cooling the melt to a solid cast material; Provision of the solid cast material for entering the solid cast material into the first furnace vessel.

This method has the particular advantage that the melting of Gus serkstoffes in the melting unit according to the invention of the melting and producing the casting material of a desired

Composition is decoupled.

In that regard, the solid Gus serkerkstoffe, with which the inventive melting unit is equipped, for example, be pre-produced to any extent, so s s if necessary, the invention

Melting unit can be supplied without delay.

Furthermore, the invention allows the production of a solid

Gus serkstoffes a desired composition on the one hand from the melting of this Gus serkstoffes in the invention

Melting unit on the other hand temporally and spatially separated takes place. S o, the production of the solid cast iron tererkstoffes, with which the inventive melting unit is equipped, for example in another

Production site as the melting of this Gus serkstoffes done in the melting unit according to the invention.

Furthermore, the melting unit according to the invention can be dimensioned relatively small.

Further features of the invention will become apparent from the claims, the figures and the accompanying description of the figures.

All features of the invention may be combined with each other, individually or in combination. An embodiment of the invention will be explained in more detail with reference to the following description of the figures.

It shows

Figure 1 shows an inventive melting unit in a lateral

Sectional view.

The marked in Figure 1 in total by the reference numeral 1

Melting unit is shown in a highly schematic embodiment in a side sectional view.

The melting unit 1 comprises a first furnace vessel 3 and a second furnace vessel 5.

The first furnace vessel 3 is designed as an induction furnace. The first furnace vessel 3 comprises a metal jacket jacket 7, which is supplied on the inside bottom side and in the, adjacent to the bottom portions of the side walls by a refractory material 9. The upper region of the side walls of the first furnace vessel 3 is not delivered by refractory material 9. The refractory material 9 encloses the furnace chamber 13 of the first furnace vessel 3 so that only on the bottom side. On the outside, the metal jacket 7 of a

Induction coil 1 1 includes stas, so that in the oven chamber 13 befindlicher

Gus material is inductively heated. On the upper side, the first furnace vessel 3 has an inlet 12, via which solid cast material can be introduced into the furnace chamber 13. The Einlas s 13 is closed by a flap 15. On the bottom side, the first furnace vessel 3 has an outlet 17 for discharging melt formed in the furnace chamber 13 of the first furnace vessel 3 from the casting material. The outlet s 17 is closed by a plug 19. The furnace chamber 13 of the first furnace vessel 3 is designed such that in this a melt of cast material up to a bath height 21st

can be included.

The throughput of the first furnace vessel 3 is about 10 tons of cast iron per hour. To be able to melt this amount of solid cast iron per hour, the furnace chamber 13 or in the furnace chamber 13

located cast iron through the induction coil 1 1 with an energy of about 4,000 kW acted upon.

Below the first furnace vessel 3, the second furnace vessel 5 is arranged. In its basic structure, the second furnace vessel 5 substantially corresponds to the first furnace vessel 3. In that regard, the second furnace vessel 5 has a

Sheet metal jacket 23, which is delivered on the inside with its refractory material 25. The refractory material 25 encloses the furnace chamber 27 of the second furnace vessel 5. For heating the second furnace vessel 5 or one in the furnace chamber 27 of the second furnace vessel fifth

located melt is the metal jacket 23 of the second furnace vessel 5 by an induction coil 29 includes stas through which the furnace chamber 27 is inductively heated. On the upper side, the second furnace vessel 5 an inlet s 3 1, via the melt formed in the first furnace vessel 3 in the furnace chamber 27 of the second furnace vessel 5 is conductive. In this case, the inlet s 3 1 of the second furnace vessel 5 is arranged vertically below the outlet 17 of the first furnace vessel 3, so the s from the first furnace vessel 3 effluent melt by gravity in free fall through the inlet s 3 1 of the second

Oven vessel 5 in the sen furnace chamber 27 flows. On the bottom side, the second furnace vessel 5 has an outlet 33, which can be closed by a stopper 35 is. About the outlet s 33 is from the furnace chamber 27 of the second furnace vessel 5 outflowing melt a distributor trough 37 zuleitbar, which directs the melt directly to a process Stechnisch downstream Vergießeinheit (not shown).

The Fas sungsvermögen the second furnace vessel 5 is about 1 t

melted Gus seisens, which is present at complete filling of the second furnace vessel 5 to the bathroom mirror 36. Through the induction coil 29 of the furnace chamber 27 of the second furnace vessel 5 with an energy of about 1, 000 kW can be acted upon.

The inventive method can be carried out with the melting unit 1 shown in the embodiment as follows:

First, a solid cast material in the form of solid cast iron is introduced through the inlet 12 into the furnace chamber 13 of the first furnace vessel 3. In the oven chamber 13, the first fixed cast iron is through the

Induction coil 1 1 so energized that this melts and the melt sen a temperature of about 1. 120 ° C has. The

melt formed accordingly is laused by opening the outlet 17 of the first furnace vessel 3 by means of the plug 19 from the outlet 17, so that the melt due to gravity through the inlet s 3 1 of the second furnace vessel 5 in the sen furnace chamber 27 flows. In the furnace chamber 27 of the second furnace vessel 5, the melt is energized by the induction coil 29 in such a way that the melt is heated to a temperature of about 1 .500 ° C. The temperature of 1 .500 ° C corresponds to the casting temperature of the melt, so that s after reaching this temperature by opening the Auslass ses 33 of the second furnace vessel 5 by means of the plug 35 from the outlet s 33 flows into the distribution channel 37, from where the melt is fed to the molds of the Vergießeinheit. In this process, a solid cast material of a known

Composition used. This cast material was obtained by the extended process according to the invention, wherein initially a melt of the casting material was prepared by melting raw materials into a melt of the casting material of a desired composition. The corresponding melt was then allowed to cool. The then formed, cold casting material was then provided to enter this Gus serkstoffes in the first furnace vessel available.

Claims

P a t e n t a n s p re c e s

Melting unit (1) for melting cast materials, having the following features:

A first furnace vessel (3) and a second furnace vessel (5);

the first furnace vessel (3) is designed for the melting of cast materials and for receiving the melt formed by the melting;

the second furnace vessel (5) is the first furnace vessel (3) in such a way

Process technology downstream, that in the first furnace vessel (3) formed from cast materials melt in the second furnace vessel (5) can be conducted;

the second furnace vessel (5) is for receiving the one from the first

Oven vessel (3) formed in the second furnace vessel (5) conductive melt and for increasing the temperature of the received melt to the casting temperature.

Melting unit according to claim 1, wherein the first furnace vessel (3) is inductively heated.

3. Melting unit according to at least one of the preceding

Claims in which the second furnace vessel (5) is inductively heated.

4. Melting unit according to claim 1, for the purpose of conducting in the second furnace vessel (5) heated to casting temperature melt in a

Treatment or Vergießeinrichtung is formed.

5. A process for producing a melt for casting with an aggregate according to at least one of the preceding claims with the following features:

Introduction of solid cast material into the first furnace vessel (3);

Melting the cast material in the first furnace vessel (3);

Passing the melt formed in the first furnace vessel (3) into the second furnace vessel (5);

Increase the temperature of the second furnace vessel (5)

absorbed melt on the casting temperature.

6. The method according to claim 5, which comprises the following further

previous steps comprises:

Creating a melt of a cast material;

Cooling the melt to a solid cast material;

Provision of the solid cast material for inputting the solid cast material into the first furnace vessel (3).