EP1546428B1 - Method and device for the production of metal alloy bodies having localized small particle size - Google Patents

Abstract

The invention relates to a method for the production of metal alloys, especially magnesium alloys, having small particle size in a non-extruded metal alloy body, in addition to a device for carrying out said method and a product which is produced according to the inventive method. Cyclical, location-dependent, alternating charging of partial surfaces of the surface of the non-extruded metal alloy body enables them to be locally compressed and de-compressed. In association with a process temperature of up to 600 DEG C of the metal alloy body, this leads to a reduction in the particle size of the metal alloy on the surface, which in turn leads to a significant improvement of the rollability of the metal alloy.

Description

The invention relates to a method for the production of metal alloys, in particular magnesium alloys, with small grain sizes within a non-extruded metal alloy body and to an apparatus for carrying out the method.

The use of light metal materials, especially in the automotive and aircraft construction, mainly serves to reduce the weight of the components used. The use of prefabricated bodies of light metal materials, e.g. However, aluminum, metal and titanium alloys, especially in further processing such as e.g. during rolling, forging or rolling, manufacturing problems, since due to the usually large grain sizes of the starting materials cracks and fractures mostly arise along the grain boundaries at the corners of the body made of light metal materials. This influences and reduces the mechanical and optical properties of the components.

The prior art therefore attempts on the one hand to improve the mechanical properties of the corresponding starting alloys. The DE 199 37 184 A1 relates, for example, to a metal alloy for use at elevated temperatures, which is particularly suitable for use in die casting. The disadvantage here is that previously known and commonly used light metal alloys can not be used and for each application and each application method, a special light metal alloy would have to be developed.

Furthermore, special processing and manufacturing methods of frequently used light metal alloys are known in the art. The DE 199 17 175 A1 describes a method for producing a component, as well as the component according to the invention. The component is produced in a die-casting mold by means of a ceramic green body in the die casting mold in that this green body is filled with a metal or a metal alloy, wherein the green body is produced as a ceramic base body by means of a ceramic powder mixture by a heating and pressing process. The disadvantage here is that this method is only applicable in the die casting process. The DE 100 33 768 A1 describes a method for folding thin-walled semi-finished products or components of at least one metallic material, wherein the material is difficult or brittle deformable at room temperature and is heated in the region to be folded. The disadvantage here, however, that the brittle properties of the machined metal materials are not changed during the folding and therefore the components continue to break and susceptible to cracking in subsequent manufacturing sections.

It is also known that, in particular, in the re-forming of conventional metal materials, such as e.g. the rolling or forging, the distribution and the size of grain sizes in a conventional metal material body, in particular during rolling, has a decisive influence on fracture and tear points of the components arising during production. The 25 21 330 C2 describes a method for inducing a simultaneous with the heat deformation running dynamic recrystallization in a metal alloy with a non-sufficient fine-grained structure, wherein for the structural influence of a metal alloy of the metal alloy blank additional elements such. Copper or zinc, and these are present as mixed crystals, wherein the fine-grained structure is formed due to a predetermined deformation temperature and a predetermined strain rate in the blank due to a progressive recrystallization. The disadvantage here is that the change in the microstructure depends on the recrystallization rate within the blank and therefore can only be used to a limited extent within the scope of a processing and production method.

Furthermore, the describes DE 695 05 327 T2 a method for producing a localized fine grain microstructure on selected surfaces of aluminum alloys. The surface of an aluminum sheet with a coarse grain microstructure with generally parallel to the longitudinal plane lying long grain boundaries is through locally processing a bullfin burr within existing holes by breaking up the coarse-grained microstructure and then initiating recrystallization by a localized heat treatment. The disadvantage here is that the method is applicable only for drilling within an aluminum alloy of an aircraft sheet metal. Furthermore, the depth of deformation of this process in the surface is very low, so that hereby only the surface corrosion of the treated surfaces but not breakage and cracking during rolling is prevented.

The DE 195 08 718 A1 describes a method for improving the properties of an alloy by extrusion or alternatively by applying a force from different directions. Both alternative types of procedure should ensure a "kneading" of the raw alloy. Thereby, the fine graininess is increased within the entire metal alloy body.

US 5,868,026 describes a method for pressing workpieces.

Based on this prior art, it is the object of the present invention to influence the structure of existing metal alloys such that the fracture and cracking tendency of non-extruded metal alloy bodies in processing and manufacturing processes, especially when rolling, is reduced and thus a cost Preparation of rollable metal alloy bodies is provided.

This object is achieved by the features of claim 1. According to the invention, it is provided that the surfaces of a non-extruded metal alloy body having a particle size greater than 200 .mu.m are alternately locally compressed and decompressed by a cyclic, location-dependent alternating loading of the surface of the non-extruded metal alloy body. and permanently heated to a process temperature range of up to 600 ° C. The cyclic, location-dependent alternating loading of the surface of the metal alloy body takes place by temporary pressure by means of pressure-exerting elements on individual defined surface segments of the surface of the metal alloy body.

In the context of the present invention, surface is understood as a surface layer of the metal alloy body, which is influenced and changed by the cyclic, location-dependent loading. The depth of this surface layer is Depending on the metal alloy used, the temperature and the deformation rate of the metal alloy due to the cyclic, location-dependent alternating load along the outer sides of the metal alloy body.

In a surface segment of the surface, in a first pressing cycle, first one of two sub-areas of the area segment is loaded by means of pressure-exerting elements and in a second pressing cycle the second sub-area of the area segment is compressed by means of other pressure-exerting elements, wherein in the second pressing cycle the first sub-area is not loaded. The shape of the respective surface segment is preferably symmetrical, in particular circular or rectangular, designed. Within a surface segment, during the second pressing cycle, the unloaded first partial surface is decompressed due to volumetric forces within the metal alloy body and / or by means of tensile elements. Furthermore, the use of spring-restoring elements is provided, which allow as a location-dependent counterforce to the first partial surface, a control of the deformation height and rate of the decompressing first partial surface, in particular at the beginning of the second Presszyklusses. Just at the beginning of the second pressing cycle, due to acting frictional forces, a jerky movement of the decompressing first partial surface may occur, which may adversely affect the material properties of the decompressing first partial surface. Upon completion of the second press cycle, the metal alloy body assumed the initial volumetric shape as before the two press cycles. This press cycle sequence can be carried out as often as desired within a surface segment with a further number of integer press cycles. After completion of the two pressing cycles, the metal alloy body is heated unloaded for a period of time to a temperature of up to 600 ° C, if a high rate of heat loss within the area segment is given. Furthermore, the shape of the first partial surface is preferably designed as an annular surface or a semicircular surface within the surface segment and the second partial surface is configured corresponding to the first partial surface within the planar segment. Also, a plurality of surface segments are defined on the surface of the metal alloy body, the surface segments adjoining each other, and the surface of the metal alloy body is completely covered with surface segments with respect to at least one orientation. During the process cycles, throughout the metal alloy body, a constant temperature in a temperature range of up to 600 ° C given. During the process, the volume of the metal alloy body is not changed. The method is not only applicable to a surface segment on the surface of a metal alloy body, but can successively cyclically and alternately compress and decompress the two partial surfaces of the respective individual surface segments along connected surface segments. Alternatively, the two partial surfaces of the individual surface segments along the surface of the metal alloy body can be successively cyclically and simultaneously compressed and decompressed along associated surface segments. At the same time, several surfaces of the metal alloy body can be cyclically or simultaneously compressed and decompressed simultaneously.

It is another object of the present invention to provide a device for carrying out the method according to the invention.

This object is achieved by the features of claim 13. According to the invention, it is provided that on a defined surface segment on the surface of the metal alloy body with coarse grain size, a pressure-exerting element loaded one of two partial surface of the surface segment during a first pressing cycle, and then another, for first fitting exactly corresponding, pressure-exerting element with a residual surface corresponding second partial surface is applied to the surface segment and loaded in a subsequent second press cycle and a heat source permanently tempered the metal alloy body to a predetermined process temperature in a range up to 600 ° C. However, the heat source is only necessary if the heat loss rates are too high during the process or the manufacturing process takes too long and thus associated with temperature losses of the metal alloy body. The surface segment is defined by the inner diameter of a pressure-resistant container parallel to the surface of the metal alloy body.

The pressure-exerting elements fill the inner diameter of the container in a corresponding and accurate way. The cross section of the metal alloy body corresponds to the cross section of the container, wherein the dimensions of the container by the dimensions of the metal alloy body and the processing plant, For example, the rolling mill, are determined. The pressure in the interior of the container is transmitted by stamping elements on in each case one of two partial surfaces, wherein the stamp elements are actuated by force transmitters connected to an external press. Furthermore, the interior and the surface segment is maintained during the process to a process temperature to compensate for any temperature losses. A power transformer controls the stamp elements in the inventive device alternately and cyclically and transmits the pressure of the press on the respective partial surfaces of the surface segments. After loading of the first punch member by means of the press and the power transformer of the power transmission, such as a steel plate is relieved by the press and then the pressure is transmitted exclusively to the second punch member on the wiederbelastenden by the press power transfer. The power transmission or the steel plate are heated to the process temperature. Likewise, the stamping surface of the first stamping element is designed in particular as an annular surface or as a semicircular surface within the inner diameter of the container. The stamp surface of the second stamp element is formed with a precise fit and corresponding to the first stamp face of the first stamp element within the inner diameter of the container. The height of the first stamp member and the height of the metal alloy body taken together have a greater height extent than the container. By varying the respective height of the punch member and the Metalllegierungsktirpers relative to the container, the deformation in the surface of the metal alloy body is determined. However, excessive over-height relative to the container results in instabilities during the press cycles and may result in breakage of the punch elements. Furthermore, the stamp elements are pressed so far into the metal alloy body during a pressing cycle that the upper edge of the stamp elements coincide with the upper edge of the container. A continuous array of juxtaposed containers along the surface of a metal alloy body defines a plurality of surface segments along an alignment of the surface of a metal alloy body. In the surface segments thus defined, a periodic arrangement of first and second punch elements serves for the cyclic, location-dependent alternating pressing of an elongated metal alloy body and thus influences the grain sizes of specific orientations along the surface of the metal alloy body. there the respective first and second punch elements of a surface segment are individually controllable. Furthermore, in each area segment in the first press cycle, the first punch element is driven by a force transmitter and driven in a two pressing cycle, the second punch element and then a new pressing cycle is initiated in a surface segment nearest thereto. As a result, the grain size of the metal alloy is changed by the device according to the invention along an orientation of the surface. After completion of all process cycles, the metal alloy body is removed from the container.

According to the invention, it is further provided that the grain sizes are reduced only along a selected orientation vertical to the longitudinal axis of the metal alloy body, wherein the orientations of the reduced grain sizes along the surface of the metal alloy body are symmetrical with respect to the longitudinal axis of the metal alloy body and in particular a sandwich structure with respect to the treated and untreated surfaces of the metal alloy body.

The process of the present application includes the processing of extruded metal alloys as described in U.S. Pat DE 195 08 718 A1 out. It is used to process non-extruded metal alloys with a grain size of more than 200 μm through a cyclic, location-dependent alternating load, which leads to local compression and decompression on individual defined surface segments. By these features, the method of the application differs substantially from the method of DE 195 08 718 A1 , When "kneading" a raw alloy by the application of a force from different directions, a cyclic, location-dependent load of the metal alloy, which leads to a local compression and decompression, is excluded. This particular on defined segments of the plane, since in the process of DE 195 08 718 A1 the force is transferred to the surface of the metal alloy, which happens to be in front of the force transmitter at random. The procedure of DE 195 08 718 A1 serves to mix the components of the raw alloy, which leads to the elimination of the interfaces and the uniform distribution of, for example, silicon particles. In contrast, the method of the present application is designed to achieve on a defined area segment on the surface of the metal alloy body smaller grain sizes.

By the method of the present application fine grain can be achieved only on the surfaces of defined segments of the metal alloy body. Since the machining of the top and bottom of a metal alloy is sufficient to control the material properties of the alloy, e.g. When rolling in terms of ductility to improve, the inventive method offers advantages over the prior art.

Figur 1a

schematische Queransicht der erfindungsgemäßen Vorrichtung mit einem bezüglich der Mittelachse symmetrischen ersten Stempelelement;

Figur 1b

schematische Längsansicht der erfindungsgemäßen Vorrichtung entlang einer periodischen Anordnung der gesamten Oberfläche mit bezüglich der Mittelachse symmetrischen ersten Stempelelementen;

Figur 2a

schematische Queransicht der erfindungsgemäßen Vorrichtung mit einem bezüglich der Mittelachse asymmetrischen ersten Stempelelement;

Figur 2b

schematische Längsansicht der erfindungsgemäßen Vorrichtung entlang einer periodischen Anordnung der gesamten Oberfläche mit bezüglich der Mittelachse asymmetrischen ersten Stempelelementen;

Figur 3

schematische Queransicht der erfindungsgemäßen Vorrichtung mit einem bezüglich der Mittelachse asymmetrischen ersten Stempelelement und einem rückstellenden Federelement während des zweiten Presszyklusses;

Figur 4

Aufnahme der Mikrostruktur einer Metalllegierung (AZ31) vor und nach der lokalisierten Bearbeitung entsprechend dem erfindungsgemäßen Verfahren;

Figur 5

Exemplarische Abmessungen der erfindungsgemäßen Vorrichtung;

Figur 6

schematische Ansicht des erfindungsgemäßen Erzeugnisses.

Further advantageous measures are described in the remaining subclaims; the invention will be described in more detail with reference to embodiments and the following figures; it shows:

FIG. 1a

schematic transverse view of the device according to the invention with a symmetrical with respect to the central axis of the first punch element;

FIG. 1b

schematic longitudinal view of the device according to the invention along a periodic arrangement of the entire surface with respect to the central axis symmetrical first punch elements;

FIG. 2a

schematic transverse view of the device according to the invention with a respect to the central axis asymmetric first punch member;

FIG. 2b

schematic longitudinal view of the device according to the invention along a periodic arrangement of the entire surface with respect to the central axis asymmetric first punch elements;

FIG. 3

schematic transverse view of the device according to the invention with a respect to the central axis asymmetric first punch member and a restoring spring element during the second Presszyklusses;

FIG. 4

Recording the microstructure of a metal alloy (AZ31) before and after the localized processing according to the method according to the invention;

FIG. 5

Exemplary dimensions of the device according to the invention;

FIG. 6

schematic view of the product according to the invention.

Fig. 1a shows a schematic representation of the transverse view of the device according to the invention during three different process sections. During the first process cycle (left illustration), the metal alloy body 10 is compressed within a container 11 by a first punch element 12. In this case, only the cross section of the metal alloy body 10 is visible in this schematic illustration. The upwardly directed surface of the metal alloy body 10 corresponds to a defined surface segment. The first stamp member 12 compresses only one part symmetrical with respect to the shape of the sheet segment. After complete compression of the first stamp member 12 in the metal alloy body 10, the second stamp member 13 is inserted into the remaining gap of the surface segment and pressed into the metal alloy body 10 in a second process section (middle illustration). After completion of this second Presszyklusses (right illustration) is due to volumetric restoring forces in the second process cycle unloaded first punch member 12 has been partially pushed out of the container 11 and the metal alloy body 10 has assumed its Ausgangsvolumenform. Throughout the process, the metal alloy body 10 is tempered by a heater (not shown) to a predetermined process temperature or the metal alloy body 10 itself has the required process temperature due to preheating (not shown).

1 b shows a schematic longitudinal view of the device according to the invention in two different process stages. The process according to the invention is carried out within a surface segment A defined by the first stamp element 12 along the surface of the metal alloy body 10, in FIG in a first cycle of the first punch member 12 is pressed into the metal alloy body 10 and in a second pressing cycle, the second punch member 13 is also pressed into the metal alloy body 10 and the first punch member 12 back unloaded unloaded (left view). Subsequently, the method according to the invention is applied to the following surface segment B and to the adjoining surface segments along the surface (right-hand representation).

FIG. 2 a shows a schematic illustration of the transverse view of the device according to the invention during three different process sections. The surface segment of the surface of the metal alloy body is in this case loaded asymmetrically with respect to the central axis of the container 11. During the first cycle of the process (left illustration), the metal alloy body 10 is compressed within a container 11 by a first asymmetrical punch element 12. In this case, only the cross section of the metal alloy body 10 is visible in this schematic representation. The first stamp member 12 compresses only an asymmetric part of the sheet segment. After complete compression of the first stamp member 12 in the metal alloy body 10, the second stamp member 13 is inserted into the remaining gap of the surface segment and pressed into the metal alloy body 10 in a second process section (middle illustration). After completion of this second Presszyklusses (right illustration) is due to volumetric restoring forces in the second process cycle unloaded first punch member 12 has been partially pushed out of the container 11 and the metal alloy body 10 has assumed its Ausgangsvolumenform. Throughout the process, the metal alloy body 10 is tempered by a heater (not shown) to a predetermined process temperature or the metal alloy body 10 itself has the required process temperature due to preheating (not shown).

FIG. 2b shows a schematic longitudinal view of the device according to the invention in two different process stages for an asymmetric variant of the inventive arrangement in FIG. 1b. Within a defined surface segment A, the method according to the invention is carried out in which the first stamp element 12 is pressed asymmetrically into the metal alloy body 10 in a first process cycle and the second stamp element 13 is pressed in a second pressing cycle is also pressed into the metal alloy body 10, wherein in the second pressing cycle, the first stamp member 12 back unloaded unloaded (left illustration). Subsequently, the method according to the invention is applied to the following surface segment B and to the adjoining surface segments along the surface (right-hand representation).

3 shows a schematic transverse view of the device according to the invention with a first stamp element that is asymmetrical with respect to the center axis. In a first process cycle, the first die element 12 is replaced by a force transducer 14, such as a force transducer. a steel plate, pressed into the container 11 (left illustration). As a corresponding holder, the bottom of the container 11 is fixed by a steel plate 15. After the end of the first pressing cycle, the force transmitter 14 is replaced by an asymmetrical force transmitter 14 (middle illustration). In the force transmitter 14 is located at the position corresponding to the first stamp member 12 a restoring spring element 16 which controls the relaxation of the first stamp member 12 during simultaneous compression of the second punch member 13 in the metal alloy body 10 by the selected spring constant during the second process cycle lake (right illustration) , By the spring element 16, a rearward movement of the decompressing first partial surface is avoided at the beginning of the second pressing cycle. This jerky movement is mainly determined by the static friction between the inner surface of the container 11 and the first stamp member 12.

Fig. 4 shows a recording of the grain sizes within a metal alloy body before and after the application of the method according to the invention. The starting material used is an AZ31 magnesium alloy with an average particle size of 800 μm (FIG. 4A). After applying the method according to the invention at a process temperature of 400 ° C. and a postheating period after completion of the press cycles of 30 minutes at 400 ° C., the particle sizes in the deformation region have been reduced to an average of 17 μm. The reduction of the grain sizes - measured from the outside of the magnesium alloy body - to a deformation depth of 9mm measurable.

Fig. 5 shows two different configurations of the device according to the invention. In the configuration of Fig. 5A, a circular magnesium alloy body 10 is inserted in a circular container 11 having an inner diameter of 30 mm. This magnesium alloy body 10 is loaded by a first annular punch element 12, wherein the inner diameter of the first punch element 12 with 15 mm corresponds to the outer diameter of the second punch element 13. The stamp elements 12,13 are connected via a steel plate 14 as a power transmission with an outer press (not shown). In the configuration of FIG. 5B, both stamp elements 12, 13 are semicircular, with the respective outside diameter of the stamp elements 12, 13 corresponding to the internal pressure gauge of the container 10. Furthermore, in this configuration, the power transmission 14 is provided with a spring-restoring element 16. By spring-returning element 16, a rearward movement of the decompressing first partial surface is avoided at the beginning of the second pressing cycle.

Only in these two examples are all the dimensions of the magnesium alloy body 10 less than that of the container 11. The absolute dimensions of the configurations shown are only to be regarded as examples on a laboratory scale.

FIG. 6 shows a schematic representation of the product according to the invention. The metal alloy body 10 is characterized in that on two mutually symmetrical side surfaces with respect to the longitudinal axis of the metal alloy body 10, a reduction of the grain sizes is achieved by the inventive method and by this sandwich structure with respect to the inventively processed and unprocessed surfaces, the fracture and cracking tendency especially is reduced at the edges of the metal alloy body 10 during further forming, in particular during rolling, of the product according to the invention.

LIST OF REFERENCE NUMBERS

10

Metal alloy body

11

Container

12

first stamp element

13

second stamp element

14

Force transmitter

15

steel plate

16

spring element

Claims (26)

1. A method for the production of metal alloys with low grain sizes within a non-extruded metal alloy body, characterised in that the surface of the non-extruded metal alloy body (10) with a grain size of greater than 200 µm is alternately locally compressed and decompressed by a cyclic, location-dependent alternate loading of the surface of the non-extruded metal alloy body (10).
2. The method according to claim 1, characterised in that the cyclic, location-dependent alternate loading of the surface of the metal alloy body (10) is effected with temporary pressure by means of pressure-exerting elements on individual defined area segments of the surface of the metal alloy body (10).
3. The method according to claims 1 and 2, characterised in that, in an area segment of the surface, in a first pressing cycle one of two part areas of the area segment is initially loaded by means of pressure-exerting elements and in a second pressing cycle the second part area of the area segment is then loaded with other pressure-exerting elements, wherein the first part area remains unloaded in the second pressing cycle.
4. The method according to claims 1 to 3, characterised in that, within an area segment, during the second pressing cycle the unloaded first part area is relaxed by means of volumetric forces within the metal alloy body (10) and/or by means of tension-exerting elements and/or by means of spring-returning elements.
5. The method according to claims 1 to 4, characterised in that, on completion of the second pressing cycle, the metal alloy body (10) is restored to its initial volume shape as existed before the two pressing cycles.
6. The method according to claims 3 to 5, characterised in that, on completion of the two pressing cycles, a further number of whole-number pressing cycles are carried out on the area segment.
7. The method according to claims 3 to 6, characterised in that the shape of the respective area segment is symmetrical, and circular or rectangular in particular.
8. The method according to claims 1 to 7, characterised in that, during the pressing cycles, the temperature within the entire metal alloy body (10) is kept constant in a range of up to 600°C.
9. The method according to claims 1 to 8, characterised in that on the surface of the metal alloy body (10) the area segments are defined in such a way that they adjoin one another and the surface of the metal alloy body (10) in terms of at least one direction at right angles to the longitudinal axis of the metal alloy body (10) is completely filled with area segments.
10. The method according to claim 9, characterised in that compression and decompression are effected successively on adjoining area segments cyclically and alternately along the surface of the metal alloy body (10).
11. The method according to claim 9, characterised in that compression and decompression are effected successively on adjoining area segments cyclically and simultaneously along the surface of the metal alloy body (10).
12. The method according to claims 10 or 11, characterised in that compression and decompression are effected successively on adjoining area segments cyclically and simultaneously along several surface directions of the metal alloy body (10).
13. A device for implementation of the method according to claims 1 to 12, characterised in that, on a defined area segment on the surface of the metal alloy body (10) with a coarse grain size,

    a) a pressure-exerting element (12) loads one of two part areas of the area segment during a first pressing cycle and then

    b) a different pressure-exerting element (13), precisely fitting and corresponding to the first one, is applied to the other, second part area and loads this second part area in a subsequent second pressing cycle.
14. The device according to claim 13, characterised in that a pressure-resistant container (11) parallel with the surface of the metal alloy body (10) is used for vertically guiding the pressure-exerting elements (12, 13), wherein an area segment is defined by the inner diameter of the container (11).
15. The device according to claims 13 to 14, characterised in that the pressure-exerting elements (12, 13) fill the inner diameter of the container (11) correspondingly and with a precise fit.
16. The device according to claims 14 to 15, characterised in that the cross section of the metal alloy body (10) corresponds to the cross section of the container (11).
17. The device according to claims 14 to 16, characterised in that an external press generates the pressure in the interior of the container (11) with plunger elements (12, 13) on one of two part areas in each case.
18. The device according to claim 17, characterised in that a power transmitter (14) joined to the press drives the plunger elements (12, 13) alternately and cyclically and transmits the pressure from the press to the respective part area of the plunger elements (12, 13).
19. The device according to claim 18, characterised in that, after the loading of the first plunger element (12) by means of the press and the power transmitter (14), the power transmitter (14) is relieved and the pressure from the press via the reloading power transmitter (14) is subsequently exclusively transmitted via the second plunger element (13).
20. The device according to claims 13 to 19, characterised in that the metal alloy body (10), the plunger elements (12, 13), the power transmitter (14) and the steel plate (15) are heated to a constant press temperature in a range of up to 600°C.
21. The device according to claims 13 to 20, characterised in that the plunger face of the first plunger element (12), particularly as an external face corresponding to the inner diameter of the container (11), is arranged with a circular recess or as a face filling the inner diameter of the container (11) on one half side and the second part area corresponding to the first part area is formed within the inner diameter of the container (11).
22. The device according to claims 13 to 21, characterised in that the plunger face of the second plunger element (13) is formed precisely fitting and corresponding to the first plunger face of the first plunger element (12) within the inner diameter of the container (11).
23. The device according to claims 13 to 22, characterised in that the height of the plunger elements (12, 13) and the height of the metal alloy body (10) are together greater than the height of the container (11), wherein the plunger elements (12, 13) are each pressed during a pressing cycle so far into the metal alloy body (10) that the top edge of the respective plunger elements (12, 13) is aligned with the top edge of the container (11).
24. The device according to claims 17 to 23, characterised in that the first (12) and second plunger elements (13) of an area segment are each individually drivable.
25. The device according to claims 17 to 24, characterised in that, in at least one area segment, in the first pressing cycle the first plunger element (12) is driven by a power transmitter (14) and in a second pressing cycle the second plunger element (13) is driven and subsequently a new pressing cycle is initiated in the immediately adjoining area segment.
26. The device according to claims 17 to 24, characterised in that, in terms of a direction at right angles to the longitudinal axis of the metal alloy body, in the first pressing cycle the first plunger element (12) is driven in each case by a power transmitter (14) and in a second pressing cycle the second plunger element (13) is driven in each case at the same time.

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