EP2986401B1 - Method and system for producing sheets from strand-shaped profiles - Google Patents

Method and system for producing sheets from strand-shaped profiles Download PDF

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EP2986401B1
EP2986401B1 EP14723692.1A EP14723692A EP2986401B1 EP 2986401 B1 EP2986401 B1 EP 2986401B1 EP 14723692 A EP14723692 A EP 14723692A EP 2986401 B1 EP2986401 B1 EP 2986401B1
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profile
production
metal sheets
sheet
extruded profile
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German (de)
French (fr)
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EP2986401A1 (en
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Ulrich Bruhnke
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/06—Making sheets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium

Definitions

  • the invention relates to a method and a plant for the production of sheets of extruded profiles of small thickness, which are in particular made of magnesium or magnesium alloys, by means of an extrusion press.
  • DE 101 50 021 B4 discloses a method and an apparatus for producing profiles or sheet metal parts from magnesium or magnesium alloys by means of pressure forming by extrusion, rolling, forging or casting, wherein the liquid melt is introduced into a continuous casting or extrusion device for producing a semi-finished product and immediately thereafter Semi-finished by forming in the hot state is brought by forming in its final form, the temperature of the material is held after solidification from the melt during the entire production in a range of 250 ° C to 350 ° C and the manufacturing process from casting to cooling the moldings in total in an inert atmosphere or in a vacuum is performed.
  • the device for carrying out these method steps is characterized in that the arrangement consists of a linking of a melting furnace, a continuous casting or extrusion, with and without roll stand, a cutting device of one or more presses and a cooling device, the entirety or parts of the aforementioned devices are arranged in a protective gas or vacuum space.
  • the device specified for carrying out this method which consists of a linking of a melting furnace or crucible, a continuous casting device, one or more rolling stands, a cutting device, one or more presses and a cooling device and is operated in a protective gas or vacuum space is characterized in that a punching device is provided between the cutting device and the press designed as a forming press, with which punching and / or forming holes which are dimensionally and cross-section stable can be introduced into the blanks coming from the cutting device.
  • a disadvantage of this method it is also that only parts can be made with a limited width, because for larger parts, a considerable overhead for the working pressures to be controlled is required.
  • the tool and the machine frame must withstand the extrusion pressure applied during production of the semi-finished products or the parts with a corresponding back pressure and thus necessarily be dimensioned much larger.
  • the DE 43 33 500 C2 discloses a method for producing a cross-sectionally stepped and solid profile sheet with different wall thicknesses, in which first a semifinished product is produced whose cross section is similar to the cross section of the sheet in the thickness direction, and in which a sheet is rolled from the semifinished product, for the production of the semi-finished product, a hollow profile with circumferentially distributed, the desired wall thickness profile of the semifinished product corresponding wall thickness profile is extruded, while the hollow profile is separated along a surface line and formed into the semifinished product. Furthermore, two complementary profiles are superimposed, wherein at least one of the profiled contact sides of the complementary profiles is provided with a release agent, and the two complementary profiles are rolled out simultaneously with cylindrical, that is unampled rolls. Before rolling, the two complementary profiles are separated on two opposite generatrices.
  • Two parts are produced by this method.
  • the production process is discontinuous and only relatively narrow parts can be produced.
  • a disadvantage is further that only relatively narrow parts made can be and the fact that due to the production of semi-finished with two different wall thicknesses and a stepped roller assembly of the manufacturing process is relatively expensive.
  • the method comprises the steps of extruding or continuously casting a tubular body, cutting open the tubular body in its longitudinal direction, widening the tubular body into a flat body, rendering the flat body into a component suitable for drawing by means of manufacturing technologies known per se.
  • the device essentially consists of a linking of a melting unit, a continuous casting or extrusion unit, a longitudinal cutting device, a rolling stand, one or more forming units.
  • From the DE 10 2007 002 322 A1 is a process for the production of sheet metal or sheet metal parts from light metal, preferably magnesium, known, wherein in one or more preceding process steps an extruded profile in an open structure or a closed structure with subsequent slitting is made into an open structure and this then in one or several steps is subjected to straightening and directional bending over several rolling and bending stages.
  • a method for producing a flat metal sheet comprises the steps of: extruding a sheet metal blank into a curved surface sheet using an extrusion line, the curved surface sheet having first and second ends, and corrugating the surface of the curved surface sheet from the first end to the second end is; Spreading the sheet with a curved surface by means of a widening system to a flat sheet.
  • the extruded Sheet metal essentially has a wavy structure. The expansion takes place here by pulling / stretching the sheet across the waveform, so as to obtain a flat sheet.
  • the object of the invention is that a method and a plant for the production of sheets of strand-shaped profiles of small thickness, in particular of magnesium or magnesium alloys, indicate, wherein the emerging from an extrusion die open or closed extrusion can be continuously formed into a flat sheet metal.
  • FIG. 1 shows a schematic diagram of a system for producing strand-shaped profiles by means of an extruder 1, which are then formed into a flat sheet metal.
  • the plant consists essentially of an extruder 1 for producing an extruded profile 6, a forming device consisting of a working coil 2 and an abutment 3 and a calibration device . 4
  • a billet of a magnesium alloy for an extruded profile 6, for example a profile 6 that in cross-section three has shaped, shaped bows.
  • the profile 6 is positioned above the working coil 2 and formed without contact by the action of force of a pulsed magnetic field with a very high intensity, wherein the profile 6 is formed against the abutment 3 to a flat plate 7 .
  • a time-varying magnetic field 6 eddy currents are induced in the electrically conductive profile.
  • the magnetic field exerts forces on these currents.
  • the strength of the forces depends on the spatial gradient of the magnetic flux density and on the size of the induced currents.
  • the profile 6 experiences a directed towards lower flux density forces.
  • the necessary for the transformation of the profiles 6 to flat sheets 7 magnetic fields are generated by charged capacitors are discharged over a matched to the profile geometry coil in the course of a few microseconds. This results in the Profiloberfilumblee a very high magnetic pulse, as a result, in the profile 6, a current flows, which is directed in opposite directions to the coil current, the profile 6 is moved towards lower fields.
  • the strength of the induced currents and concomitantly the force on the profile 6 depend on the electrical conductivity. Since magnesium or the magnesium alloy have a relatively good electrical conductivity, act on the surface of the profile 6 high pressures. These can be up to several thousand megapascals. This pressure prevails only in a short time range, namely in the range of a few microseconds, during the duration of the discharge of the capacitors.
  • the profile 6 absorbs the required deformation energy in the form of pulses during this time. After an acceleration phase, the material of the profile 6 moves very quickly due to its low mass. In this case, speeds of up to 300 m / s can be achieved.
  • the stresses occurring in the profile 6 are so high that a flow in the sense of forming technology occurs and the profile 6 is formed into a flat sheet 7 .
  • the sheet 7 passes through a calibration device for smoothing and is wound up to the coil 5 .
  • a calibration device for smoothing
  • profiles 6 In order to reshape closed profiles 6 into a sheet metal, these are either provided with a predetermined breaking point along the surface line during profile production or separated along the surface line by means of a cutting device. For profiles 6 with inserted breaking point they are separated by the action of magnetic forces and converted to the sheet. 7

Description

Die Erfindung betrifft ein Verfahren und eine Anlage zur Herstellung von Blechen aus strangförmigen Profilen geringer Dicke, welche insbesondere aus Magnesium oder Magnesiumlegierungen hergestellt werden, mittels einer Strangpreßanlage.The invention relates to a method and a plant for the production of sheets of extruded profiles of small thickness, which are in particular made of magnesium or magnesium alloys, by means of an extrusion press.

Allgemein bekannt ist das Herstellen von Blechen durch Walzen in konventionellen Walzgerüsten, wobei für das Herstellen von Blechen entsprechende Materialblöcke durch Walzvorgänge zu Blechen umgearbeitet werden. Aufgrund der großen Anzahl von Walzstichen vom Grob- zum Feinblech ist dieses Verfahren sehr kostenintensiv. Bei der Verarbeitung von Magnesium-Blöcken zu entsprechenden Blechen ist dies jedoch sehr aufwendig und bedingt durch die dem Magnesium eigene Sprödigkeit treten oftmals Rißbildungen auf. Die hohe Anzahl von Walzstichen wirkt sich auch negativ auf die Gefügestruktur und somit auf die mechanischen Eigenschaften aus.Generally known is the production of sheets by rolling in conventional rolling stands, wherein for the production of sheets corresponding blocks of material are reworked by rolling operations to sheets. Due to the large number of rolling passes from coarse to thin sheet, this process is very costly. In the processing of magnesium blocks to corresponding sheets, however, this is very complicated and due to the brittleness inherent in magnesium, cracks often occur. The high number of rolling passes also has a negative effect on the microstructure and thus on the mechanical properties.

In der DE 101 50 021 B4 wird ein Verfahren und eine Vorrichtung zur Herstellung von Profilen oder Blechteilen aus Magnesium oder Magnesiumlegierungen mittels Druckumformung durch Strangpressen, Walzen, Schmieden oder Gießen offenbart, wobei die flüssige Schmelze in eine Stranggieß- oder Strangpreßeinrichtung zur Herstellung eines Halbzeuges eingebracht wird und unmittelbar danach dieses Halbzeug durch Umformung im Warmzustand durch Umformung in seine endgültige Form gebracht wird, wobei die Temperatur des Werkstoffes nach dem Erstarren aus der Schmelze während der gesamten Fertigung in einem Bereich von 250°C bis 350°C gehalten wird und der Fertigungsprozeß vom Gießen bis zur Abkühlung der Formteile insgesamt in einer inerten Atmosphäre oder im Vakuum durchgeführt wird.In the DE 101 50 021 B4 discloses a method and an apparatus for producing profiles or sheet metal parts from magnesium or magnesium alloys by means of pressure forming by extrusion, rolling, forging or casting, wherein the liquid melt is introduced into a continuous casting or extrusion device for producing a semi-finished product and immediately thereafter Semi-finished by forming in the hot state is brought by forming in its final form, the temperature of the material is held after solidification from the melt during the entire production in a range of 250 ° C to 350 ° C and the manufacturing process from casting to cooling the moldings in total in an inert atmosphere or in a vacuum is performed.

Die Vorrichtung zur Durchführung dieser Verfahrensschritte ist dadurch gekennzeichnet, daß die Anordnung aus einer Verkettung von einem Schmelzofen, einer Stranggieß- oder Strangpreßeinrichtung, mit und ohne Walzgerüst, einer Schneideinrichtung einer oder mehreren Pressen und einer Abkühleinrichtung besteht, die Gesamtheit oder Teile aus den vorgenannten Einrichtungen in einem Schutzgas- oder Vakuumraum angeordnet sind.The device for carrying out these method steps is characterized in that the arrangement consists of a linking of a melting furnace, a continuous casting or extrusion, with and without roll stand, a cutting device of one or more presses and a cooling device, the entirety or parts of the aforementioned devices are arranged in a protective gas or vacuum space.

Weiterhin wird in der DE 103 17 080 B4 ein Verfahren zur Herstellung von Blechformteilen aus Magnesium beschrieben, bei dem ein Blechformteil direkt im Anschluß an den Walzprozeß durch Umformen mit mindestens einer Presse in einem Temperaturbereich von >350°C bis 450°C hergestellt werden kann. Die zur Durchführung dieses Verfahrens angegebene Vorrichtung, welche aus einer Verkettung von einem Schmelzofen oder-tiegel, einer Stranggießeinrichtung, einem oder mehreren Walzgerüsten, einer Schneideinrichtung, einer oder mehrer Pressen und einer Abkühleinrichtung besteht und in einem Schutzgas- oder Vakuumraum betrieben wird, ist dadurch gekennzeichnet, daß zwischen der Schneideinrichtung und der als Umformpresse ausgebildeten Presse eine Stanzeinrichtung vorgesehen ist, mit der in die von der Schneideinrichtung kommenden Platinen form- und querschnittsstabile Stanz- und/oder Formlöcher einbringbar sind.Furthermore, in the DE 103 17 080 B4 a method for the production of sheet metal parts from magnesium described in which a sheet metal part can be produced directly after the rolling process by forming with at least one press in a temperature range of> 350 ° C to 450 ° C. The device specified for carrying out this method, which consists of a linking of a melting furnace or crucible, a continuous casting device, one or more rolling stands, a cutting device, one or more presses and a cooling device and is operated in a protective gas or vacuum space is characterized in that a punching device is provided between the cutting device and the press designed as a forming press, with which punching and / or forming holes which are dimensionally and cross-section stable can be introduced into the blanks coming from the cutting device.

Mit der DE 102 47 129 A1 wird ein weiteres Verfahren zur Herstellung von Profilen oder Blechformteilen aus Magnesium oder Magnesiumlegierungen wiedergegeben, bei dem ein Halbzeug in Form eines Bleches durch Umformen, vorzugsweise durch Formpressen, in seine endgültige Form gebracht wird, wobei in einem Verfahrensschritt unmittelbar vor dem Umformvorgang die Oberfläche durch Spanabhebung, vorzugsweise durch Schaben, von Verunreinigungen befreit wird.With the DE 102 47 129 A1 another method for the production of profiles or sheet metal parts made of magnesium or magnesium alloys is reproduced, in which a semi-finished product in the form of a sheet by forming, preferably is brought into its final shape by compression molding, wherein in a process step immediately before the forming process, the surface is removed by removal of chips, preferably by scraping, of impurities.

Von Nachteil bei diesem Verfahren ist es weiterhin , daß nur Teile mit einer beschränkten Breite hergestellt werden können, denn bei größeren Teilen wird ein erheblicher Mehraufwand für die zu beherrschenden Arbeitsdrücke erforderlich. Das Werkzeug und das Maschinengestell müssen dem beim Fertigen der Halbzeuge bzw. der Teile anliegenden Strangpreßdruck mit einem entsprechenden Gegendruck standhalten und so notwendigerweise wesentlich größer dimensioniert werden.A disadvantage of this method, it is also that only parts can be made with a limited width, because for larger parts, a considerable overhead for the working pressures to be controlled is required. The tool and the machine frame must withstand the extrusion pressure applied during production of the semi-finished products or the parts with a corresponding back pressure and thus necessarily be dimensioned much larger.

Die DE 43 33 500 C2 offenbart ein Verfahren zur Herstellung eines im Querschnitt gestuften und ein Vollprofil aufweisenden Bleches mit unterschiedlichen Wandstärken, bei dem zunächst ein Halbzeug hergestellt wird, dessen Querschnitt zu dem Querschnitt des Bleches in Dickenrichtung ähnlich ist, und bei welchem aus dem Halbzeug ein Blech gewalzt wird, wobei für die Herstellung des Halbzeuges ein Hohlprofil mit am Umfang verteilten, dem gewünschten Wanddickenverlauf des Halbzeuges entsprechendem Wanddickenverlauf stranggepreßt wird, und dabei das Hohlprofil entlang einer Mantellinie aufgetrennt und zu dem Halbzeug umgeformt wird. Weiterhin werden dabei zwei Komplementär-Profile aufeinandergelegt, wobei zumindest eine der profilierten Berührungsseiten der Komplementär-Profile mit einem Trennmittel versehen wird, und die beiden Komplementär-Profile gleichzeitig mit zylindrischen, das heißt ungestuften Walzen ausgewalzt werden. Vor dem Walzen werden die beiden Komplementär-Profile an zwei gegenüberliegenden Mantellinien getrennt.The DE 43 33 500 C2 discloses a method for producing a cross-sectionally stepped and solid profile sheet with different wall thicknesses, in which first a semifinished product is produced whose cross section is similar to the cross section of the sheet in the thickness direction, and in which a sheet is rolled from the semifinished product, for the production of the semi-finished product, a hollow profile with circumferentially distributed, the desired wall thickness profile of the semifinished product corresponding wall thickness profile is extruded, while the hollow profile is separated along a surface line and formed into the semifinished product. Furthermore, two complementary profiles are superimposed, wherein at least one of the profiled contact sides of the complementary profiles is provided with a release agent, and the two complementary profiles are rolled out simultaneously with cylindrical, that is unampled rolls. Before rolling, the two complementary profiles are separated on two opposite generatrices.

Mit diesem Verfahren werden jeweils zwei Teile hergestellt. Der Fertigungsablauf ist diskontinuierlich und es können nur relativ schmale Teile hergestellt werden. Ein Nachteil ist weiterhin, daß nur relativ schmale Teile gefertigt werden können und die Tatsache, daß auf Grund der Fertigung des mit zwei unterschiedlichen Wandstärken ausgeführten Halbzeuges sowie einer gestufte Walzenanordnung der Fertigungsprozeß relativ aufwendig ist.Two parts are produced by this method. The production process is discontinuous and only relatively narrow parts can be produced. A disadvantage is further that only relatively narrow parts made can be and the fact that due to the production of semi-finished with two different wall thicknesses and a stepped roller assembly of the manufacturing process is relatively expensive.

Aus der DE 10 2008 048 496 A1 ist ein Verfahren zur Herstellung von Blechformteilen und eine Vorrichtung zur Durchführung des Verfahrens bekannt. Das Verfahren umfaßt die Schritte - Strangpressen oder Stranggießen eines rohrförmigen Körpers, - Aufschneiden des rohförmigen Körpers in seiner Längsrichtung, - Aufweiten des rohrförmigen Körpers zu einem flächigen Körper, -Ausfertigen des flächigen Körpers zum zeichnungsgerechten Bauteil mittels an sich bekannter Fertigungstechnologien. Die Vorrichtung besteht im wesentlichen aus einer Verkettung von einer Schmelzeinheit, einer Stranggieß- oder Strangpreßeinheit, einer Längsschneideinrichtung, einem Walzgerüst, einer oder mehreren Umformeinheiten.From the DE 10 2008 048 496 A1 a method for the production of sheet metal parts and an apparatus for carrying out the method is known. The method comprises the steps of extruding or continuously casting a tubular body, cutting open the tubular body in its longitudinal direction, widening the tubular body into a flat body, rendering the flat body into a component suitable for drawing by means of manufacturing technologies known per se. The device essentially consists of a linking of a melting unit, a continuous casting or extrusion unit, a longitudinal cutting device, a rolling stand, one or more forming units.

Aus der DE 10 2007 002 322 A1 ist ein Verfahren zur Herstellung von Blechen oder Blechteilen aus Leichtmetall, vorzugsweise Magnesium, bekannt, wobei in einem oder mehreren vorgehenden Verfahrensschritten ein Strangpreßprofil in einer offenen Struktur bzw. einer geschlossenen Struktur mit anschließendem Aufschlitzen zu einer offenen Struktur hergestellt wird und dieses anschließend in einem oder mehreren Schritten einem Richtwalzen und Richtbiegen über mehrere Walz- und Biegestufen unterworfen wird.From the DE 10 2007 002 322 A1 is a process for the production of sheet metal or sheet metal parts from light metal, preferably magnesium, known, wherein in one or more preceding process steps an extruded profile in an open structure or a closed structure with subsequent slitting is made into an open structure and this then in one or several steps is subjected to straightening and directional bending over several rolling and bending stages.

Aus der CN 102 179 422 A , auf welcher der Oberbegriff der Ansprüche 1 und 7 basiert, ist ein Verfahren zur Herstellung eines flachen Metallbleches bekannt. Das Verfahren umfasst die folgenden Schritte: Extrudieren eines Blechzuschnittes in ein Blech mit gekrümmter Oberfläche unter Verwendung einer Extrusionsanlage, wobei das Blech mit gekrümmter Oberfläche ein erstes und ein zweites Ende aufweist, und die Fläche des Bleches mit gekrümmter Oberfläche vom ersten Ende zum zweiten Ende gewellt ist; Ausbreiten des Bleches mit gekrümmter Oberfläche mittels einer Aufweitungsanlage zu einem ebenen Blech. Das extrudierte Blech weist im Wesentlichen eine wellenförmige Struktur auf. Das Aufweiten erfolgt hier durch ein Auseinanderziehen / Strecken des Bleches quer zur Wellenform, um so ein ebenes Blech zu erhalten.From the CN 102 179 422 A on which the preamble of claims 1 and 7 is based, a method for producing a flat metal sheet is known. The method comprises the steps of: extruding a sheet metal blank into a curved surface sheet using an extrusion line, the curved surface sheet having first and second ends, and corrugating the surface of the curved surface sheet from the first end to the second end is; Spreading the sheet with a curved surface by means of a widening system to a flat sheet. The extruded Sheet metal essentially has a wavy structure. The expansion takes place here by pulling / stretching the sheet across the waveform, so as to obtain a flat sheet.

Die Aufgabe der Erfindung besteht darin, daß ein Verfahren und eine Anlage zur Herstellung von Blechen aus strangförmigen Profilen geringer Dicke, insbesondere aus Magnesium oder Magnesiumlegierungen, anzugeben, wobei die aus einem Strangpreßwerkzeug austretenden offenen oder geschlossenen Strangpreßprofile kontinuierlich zu einem ebenen Blech umgeformt werden können.The object of the invention is that a method and a plant for the production of sheets of strand-shaped profiles of small thickness, in particular of magnesium or magnesium alloys, indicate, wherein the emerging from an extrusion die open or closed extrusion can be continuously formed into a flat sheet metal.

Erfindungsgemäß wird diese Aufgabe durch die angegebene kontinuierliche Ausführung der im Anspruch 1 genannten Arbeitsschritte gelöst. Das aus dem Strangpreßwerkzeug einer Strangpresse austretende Strangpreßprofil durch berührungsloses Einwirken elektromagnetischer Kräfte zu einem ebenen Blech verformt wird und anschließend einem Glättungsprozeß mittels einer Walz- oder Kalibriereinrichtung unterworfen.According to the invention this object is achieved by the specified continuous embodiment of the mentioned in claim 1 steps. The extruded from the extrusion die of an extruder extrusion is deformed by contactless exposure to electromagnetic forces to a flat sheet and then subjected to a smoothing process by means of a rolling or calibrating.

Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind aus den übrigen Unteransprüchen und aus dem nachfolgend prinzipmäßig beschriebenen Ausführungsbeispiel ersichtlich.Advantageous developments and refinements of the invention can be seen from the remaining subclaims and from the embodiment described in principle below.

Die Figur 1 zeigt eine Prinzipdarstellung einer Anlage zur Herstellung strangförmiger Profile mittels einer Strangpresse 1, die anschließend zu einem ebenen Blech umgeformt werden. Die Anlage besteht im wesentlichen aus einer Strangpresse 1 zur Herstellung eines Strangpressprofils 6, einer Umformeinrichtung bestehend aus einer Arbeitsspule 2 und einem Gegenlager 3 sowie einer Kalibriereinrichtung 4. The FIG. 1 shows a schematic diagram of a system for producing strand-shaped profiles by means of an extruder 1, which are then formed into a flat sheet metal. The plant consists essentially of an extruder 1 for producing an extruded profile 6, a forming device consisting of a working coil 2 and an abutment 3 and a calibration device . 4

Mittels der Strangpresse 1 wird ein Pressbolzen aus einer Magnesiumlegierung zu einem Strangpressprofil 6, beispielsweise einem Profil 6, dass im Querschnitt drei sinnusförmige Bögen aufweist, geformt. Anschließend wird das Profil 6 oberhalb der Arbeitsspule 2 positioniert und durch Krafteinwirkung eines gepulsten Magnetfeldes mit einer sehr hohen Intensität berührungslos umgeformt, wobei das Profil 6 gegen das Gegenlager 3 zu einem ebenen Blech 7 umgeformt wird.By means of the extruder 1, a billet of a magnesium alloy for an extruded profile 6, for example a profile 6 that in cross-section three has shaped, shaped bows. Subsequently, the profile 6 is positioned above the working coil 2 and formed without contact by the action of force of a pulsed magnetic field with a very high intensity, wherein the profile 6 is formed against the abutment 3 to a flat plate 7 .

Durch ein zeitlich verändertes Magnetfeld werden im elektrisch leitenden Profil 6 Wirbelströme induziert. Auf diese Ströme übt das Magnetfeld Kräfte aus. Die Stärke der Kräfte ist abhängig vom räumlichen Gradienten der magnetischen Flußdichte und von der Größe der induzierten Ströme abhängig. Das Profil 6 erfährt dabei eine hin zu geringeren Flußdichte gerichtete Kräfte. Die für die Umformung der Profile 6 zu ebenen Blechen 7 notwendigen Magnetfelder werden erzeugt, indem geladene Kondensatoren im Verlauf von wenigen Mikrosekunden über eine an die Profilgeometrie angepaßte Spule entladen werden. Dadurch entsteht in der Profiloberfiläche ein sehr hoher Magnetimpuls, in deren Folge im Profil 6 ein Strom fließt, der gegenläufig zum Spulenstrom gerichtet ist, wobei das Profil 6 hin zu niedrigeren Feldern bewegt wird.By a time-varying magnetic field 6 eddy currents are induced in the electrically conductive profile. The magnetic field exerts forces on these currents. The strength of the forces depends on the spatial gradient of the magnetic flux density and on the size of the induced currents. The profile 6 experiences a directed towards lower flux density forces. The necessary for the transformation of the profiles 6 to flat sheets 7 magnetic fields are generated by charged capacitors are discharged over a matched to the profile geometry coil in the course of a few microseconds. This results in the Profiloberfiläche a very high magnetic pulse, as a result, in the profile 6, a current flows, which is directed in opposite directions to the coil current, the profile 6 is moved towards lower fields.

Die Stärke der induzierten Ströme und damit einhergehend die Krafteinwirkung auf das Profil 6 hängen von der elektrischen Leitfähigkeit ab. Da Magnesium bzw. die Magnesiumlegierung eine relativ gute elektrische Leitfähigkeit besitzen, wirken auf die Oberfläche des Profils 6 hohe Drücke. Diese können bis zu mehreren tausend Megapascal betragen. Dieser Druck herrscht nur in einem kurzen zeitlichen Bereich, nämlich im Bereich von wenigen Mirkosekunden, während der Dauer der Entladung der Kondensatoren. Das Profil 6 nimmt in dieser Zeit die benötigte Umformenergie in Form von Impulsen auf. Nach einer Beschleunigungsphase bewegt sich das Material des Profils 6 aufgrund seiner geringen Masse sehr schnell. Dabei können Geschwindigkeiten von bis zu 300 m/s erreicht werden. Die im Profil 6 auftretenden Spannungen werden so hoch, dass ein Fließen im Sinne der Umformtechnik eintritt und das Profil 6 zu einem ebenen Blech 7 umgeformt wird.The strength of the induced currents and concomitantly the force on the profile 6 depend on the electrical conductivity. Since magnesium or the magnesium alloy have a relatively good electrical conductivity, act on the surface of the profile 6 high pressures. These can be up to several thousand megapascals. This pressure prevails only in a short time range, namely in the range of a few microseconds, during the duration of the discharge of the capacitors. The profile 6 absorbs the required deformation energy in the form of pulses during this time. After an acceleration phase, the material of the profile 6 moves very quickly due to its low mass. In this case, speeds of up to 300 m / s can be achieved. The stresses occurring in the profile 6 are so high that a flow in the sense of forming technology occurs and the profile 6 is formed into a flat sheet 7 .

Anschließend durchläuft das Blech 7 eine Kalibriereinrichtung zur Glättung und wird zum Coil 5 aufgewickelt. Alternativ dazu ist es möglich, das Aufwickeln zum Coil 5 durch eine Stanz- oder Schneideinrichtung zu ersetzen, mit deren Hilfe aus dem aus der Kalibriereinrichtung kommenden Blech 7 Bauteile gestanzt werden bzw. das Blech 7 zu Tafeln oder Bändern geschnitten werden.Subsequently, the sheet 7 passes through a calibration device for smoothing and is wound up to the coil 5 . Alternatively, it is possible to replace the winding to the coil 5 by a punching or cutting device, with the help of which from the coming out of the calibration device sheet 7 components are punched or the sheet 7 are cut into sheets or tapes.

Um geschlossene Profile 6 zu einem Blech umzuformen, werden diese bei der Profilherstellung entweder mit einer Sollbruchstelle entlang der Mantellinie versehen oder mittels einer Schneideinrichtung entlang der Mantellinie aufgetrennt. Bei Profilen 6 mit eingebrachter Sollbruchstelle werden diese durch die Einwirkung magnetischer Kräfte aufgetrennt und zum Blech 7 umgeformt.In order to reshape closed profiles 6 into a sheet metal, these are either provided with a predetermined breaking point along the surface line during profile production or separated along the surface line by means of a cutting device. For profiles 6 with inserted breaking point they are separated by the action of magnetic forces and converted to the sheet. 7

Besonderen Vorteile des erfindungsgemäßen Verfahrens liegen zum einen darin, dass die Magnetfelder und die magnetischen Kräfte ungehindert durch das Material wirken, wodurch das Magnetumformen auch unter Vakuum oder einer Schutzatmosphäre angewendet werden kann, und andererseits benötigen Magnetumformanlagen keinen mechanischen Kontakt zum Werkstück, wodurch Oberflächenverunreinigungen oder Werkzeugabdrücke vermieden werden. Von Vorteil sind auch die kurzen Prozeßzeiten für den Umformvorgang zum Blech 7, die unter 0,1 s liegen.Particular advantages of the method according to the invention are, on the one hand, that the magnetic fields and the magnetic forces act unimpeded through the material, whereby the magnetic forming can also be applied under vacuum or a protective atmosphere, and on the other hand Magnetumformanlagen require no mechanical contact with the workpiece, whereby surface impurities or tool marks be avoided. Also advantageous are the short process times for the forming process to the plate 7, which are less than 0.1 s.

BezugszeichenaufstellungREFERENCE NUMBERS

11
- Strangpresse- Extruder
22
- Arbeitsspule- Working coil
33
- Gegenlager- Counter bearing
44
- Walz- /Kalibriereinrichtung- Rolling / calibrating device
55
- Coil- coil
66
- Strangpressprofil- Extruded profile
77
- Blech- Sheet

Claims (7)

  1. Method for producing metal sheets from strand-shaped profiles having a low thickness made of magnesium or magnesium alloys, an open or closed extruded profile being is produced in a preceding method step,
    characterised in that
    the extrusion profile (6) coming out of the extrusion die of an extrusion press (1) is shaped to a level sheet (7) by the contact-less influence of electromagnetic forces.
  2. Method for the production of metal sheets according to claim 1,
    characterised in that
    after the deformation to a level sheet (7), a smoothing step is performed by means of a rolling or calibration unit (4).
  3. Method for the production of metal sheets according to claims 1 and 2,
    characterised in that
    the extruded profile (6) is produced as open profile with a contour showing at least one sine-shaped section.
  4. Method for the production of metal sheets according to claims 1 and 2,
    characterised in that
    the extruded profile (6) is produced as closed profile with a circular or almost circular contour, or as a contour showing at least one sine-shaped section.
  5. Method for the production of metal sheets according to claims 1 and 2,
    characterised in that
    a predetermined breaking point is introduced into a closed extruded profile (6) along its peripheral surface line by means of the extrusion die.
  6. Method for the production of metal sheets according to claims 1 and 2,
    characterised in that
    in case of a closed extruded profile (6), this profile is severed along its peripheral surface line by means of a cutting unit.
  7. System for putting the method into practice according to claim 1 and at least one of the claims 2 to 6 for the production of an extruded profile and subsequent deformation to a level metal sheet,
    characterised in that
    this installation consists of an extrusion press (1), a deformation unit, consisting of a working coil (2) and a counter bearing (3) as well as a rolling or calibration unit (4).
EP14723692.1A 2013-04-10 2014-04-08 Method and system for producing sheets from strand-shaped profiles Active EP2986401B1 (en)

Applications Claiming Priority (2)

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DE102013006171.7A DE102013006171B4 (en) 2013-04-10 2013-04-10 Process and plant for the production of sheet metal from extruded profiles
PCT/DE2014/000179 WO2014166474A1 (en) 2013-04-10 2014-04-08 Method and system for producing sheets from strand-shaped profiles

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EP2986401A1 EP2986401A1 (en) 2016-02-24
EP2986401B1 true EP2986401B1 (en) 2017-01-11

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EP (1) EP2986401B1 (en)
JP (1) JP6357530B2 (en)
KR (1) KR20150139930A (en)
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CA (1) CA2909199C (en)
DE (2) DE102013006171B4 (en)
ES (1) ES2630114T3 (en)
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CA2909199A1 (en) 2014-10-16
JP2016522747A (en) 2016-08-04
US10040109B2 (en) 2018-08-07
WO2014166474A1 (en) 2014-10-16
US20160059289A1 (en) 2016-03-03
CN105263644A (en) 2016-01-20
DE112014001932A5 (en) 2016-03-03
CA2909199C (en) 2018-05-15
EP2986401A1 (en) 2016-02-24
JP6357530B2 (en) 2018-07-11
KR20150139930A (en) 2015-12-14
ES2630114T3 (en) 2017-08-18
DE102013006171B4 (en) 2015-04-16
CN105263644B (en) 2017-07-11

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