EP1306145A1 - Method for thermal hydroforming - Google Patents

Method for thermal hydroforming Download PDF

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Publication number
EP1306145A1
EP1306145A1 EP02020724A EP02020724A EP1306145A1 EP 1306145 A1 EP1306145 A1 EP 1306145A1 EP 02020724 A EP02020724 A EP 02020724A EP 02020724 A EP02020724 A EP 02020724A EP 1306145 A1 EP1306145 A1 EP 1306145A1
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European Patent Office
Prior art keywords
mold
metal
forming method
plates
heating
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Granted
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EP02020724A
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German (de)
French (fr)
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EP1306145B1 (en
Inventor
Peter Katzlinger
Helmut Reuter
Bernd Dr. Baumann
Burkhard Prof. Dr. Heine
Herbert Prof. Dr.-Ing. Bauer
Andreas Dr. Haas
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021—Deforming sheet bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021—Deforming sheet bodies
    • B21D26/031—Mould construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/053—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure characterised by the material of the blanks
    • B21D26/059—Layered blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling

Definitions

  • the invention relates to a thermal internal pressure forming process according to the preamble of claim 1.
  • the object of the invention is so the method of the type mentioned to design that also conventional, prone to recrystallization under the influence of heat Materials, such as normal aluminum or titanium, on the production side simple way without unwanted structural changes in the temperature range close to the melting point for high-quality hollow components are internally formable.
  • Shortening the heating and deformation phase is a nuisance Structural transformation of materials that are sensitive in this regard is prevented and in connection with the use of conventional, non-grain size stabilized instead of superplastic materials, a much cheaper one Component manufacturing with high degrees of forming ensured without the melting point of the sheet metal near the melting point is disadvantageous affects the material properties of the finished hollow component, with the further, Effect that is particularly significant for series production Due to the shorter cycle times, correspondingly higher production rates let achieve.
  • the heating and deformation phase has proven to be particularly advantageous limited to a period of about 5 minutes.
  • the invention preferably uses conventional aluminum sheets or the like made of a non-grain size stabilized aluminum alloy at one Temperature level of about 500 ° C deformed inside.
  • the sheet metal plates according to the Insert into the mold on the way via an integrated in this Heater heats up, which on the one hand wastes time when heating up the blanks are created outside the mold, avoided and on the other hand - unlike when heating the sheet metal plates with the help of a heated one Pressure medium - an exact, time-separate control of heating and Deformation process is made possible.
  • the internal pressure deformation is expediently carried out with the aid of a gaseous one Pressure medium, in the simplest case air, under a pressure of normally 20 to 40 bar up to pressure values of approx. 250 bar, if z. B. sharp-edged corner areas are to be formed on the hollow components.
  • a gaseous one Pressure medium in the simplest case air
  • these are advantageously partially precoated with a release agent.
  • the structural rigidity of the hollow components can be thereby increase in a technically simple manner that between the outer sheet metal plates arranged at least one inner plate of the same material and is welded to the edge of these, which is when the Outer boards to a stiffening plate passing through the hollow body deformed.
  • the hollow component 1 which is closed in cross section, is initially two sheet metal blanks 2, 3 with a wall thickness of a few mm each from conventional, non-grain size stabilized aluminum or an aluminum alloy, which on their contact surfaces - with the exception of a narrow one Edge strip - with a silicon nitride, shown in dashed lines Release agent layer 4 are occupied, with the interposition of a pressure lance 5 placed in a mold designated 6 overall.
  • Mold cavity 7 provided tool upper and lower part 8, 9, which on the Are each surrounded by a heat insulation layer 10 and by a heater 11 continuously at a near the melting point the metal plates 2, 3 lying temperature level of about 500 ° C. being held.
  • To monitor the temperature level are in the area the mold cavity 7 and in the edge region of the sheet metal plates 2, 3 each temperature sensors 12 arranged.
  • the tool parts 8, 9 are moved together and the sheet metal plates 2, 3 under the pressure effect of the tool parts 8, 9 and the simultaneous, near melting point heating on their Release agent-free edge zones are pressure-welded to one another, while a Melt bond on the other contact surfaces due to the release agent coating 4 is prevented.
  • Print medium e.g. B. compressed air
  • the pressure level of the print medium is usually between 20 and 40 bar, but can vary depending on the degree of deformation and cross-sectional geometry of the hollow component 1 up to 250 bar be raised.
  • the shaping tool 6 is opened and the hollow body 1 removed, whereupon the pressure lance 5 separated, the resulting Hollow body opening closed and a new production cycle started can be. It is essential that the time between heating up the metal plates 2, 3 and the removal of the hollow body 1 so short is dimensioned that a structural transformation of the sheet metal plates 2, 3 is omitted. This period of time is conventional, not grain size stabilized Aluminum boards on the order of a few, namely about 5 Minutes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The forming method uses a forming tool with an integrated heating device (11) for heating a pair of sheet metal plates (2,3) which are welded together around their edges to close to the melting temperature, before supplying a pressure medium between the plates, which are forced outwards into contact with the walls of a forming cavity, for providing a hollow component. The heating and forming process is effected in a short time interval, of less than the time required for a structural change in the material of the metal plates.

Description

Die Erfindung bezieht sich auf ein thermisches Innendruck-Umformverfahren nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a thermal internal pressure forming process according to the preamble of claim 1.

Aus der DE 195 31 035 C2 ist ein Verfahren dieser Art zur Innendruckumformung von randseitig miteinander verschweißten Blech- und insbesondere Aluminiumplatinen bekannt, bei dem die Blechplatinen entweder außerhalb des Formwerkzeugs oder in diesem selbst durch Vor- oder Aufheizen der Form oder des Druckmediums auf ein erhöhtes Temperaturniveau erwärmt und in diesem Zustand umgeformt werden, um auf diese Weise mit relativ niedrigen Drücken hohe Umformgrade zu erzielen. Dabei ergeben sich jedoch bei Werkstoffen wie Titan oder eben auch Aluminium, die in der Kraft- und Luftfahrzeugindustrie zunehmend häufiger zum Einsatz kommen, höchst unerwünschte Gefügeumwandlungen mit Rekristallisations- und Versprödungseffekten, wenn nicht auf korngrößenstabilisierte, superplastische Sonderwerkstoffe zurückgegriffen wird, die sehr kostspielig und zumindest für eine Serienfertigung nicht akzeptabel sind.DE 195 31 035 C2 describes a method of this type for internal pressure forming of sheet metal and especially welded together at the edge Aluminum boards known, in which the sheet metal boards either outside of Mold tool or in this itself by preheating or heating the mold or the print medium is heated to an elevated temperature level and in This condition can be reshaped to be relatively low in this way Press to achieve high degrees of deformation. However, this results in materials like titanium or aluminum, used in the automotive and aircraft industries increasingly used, highly undesirable Structural transformations with recrystallization and embrittlement effects, if do not use grain size stabilized, superplastic special materials that is very expensive and at least not for series production are acceptable.

Aufgabe der Erfindung ist es, das Verfahren der eingangs genannten Art so auszugestalten, dass auch konventionelle, unter Wärmeeinwirkung rekristallisationsanfällige Werkstoffe, wie normales Aluminium oder Titan, auf fertigungstechnisch einfache Weise ohne unerwünschte Gefügeumwandlungen im schmelzpunktnahen Temperaturbereich zu qualitativ hochwertigen Hohlbauteilen innendruckumformbar sind. The object of the invention is so the method of the type mentioned to design that also conventional, prone to recrystallization under the influence of heat Materials, such as normal aluminum or titanium, on the production side simple way without unwanted structural changes in the temperature range close to the melting point for high-quality hollow components are internally formable.

Diese Aufgabe wird erfindungsgemäß durch das im Patentanspruch 1 angegebene Verfahren gelöst.This object is achieved by the one specified in claim 1 Procedure solved.

Erfindungsgemäß wird durch eine gegenüber den bekannten Verfahren wesentliche Verkürzung der Erwärmungs- und Verformungsphase eine störende Gefügeumwandlung an in dieser Hinsicht empfindlichen Materialien unterbunden und in Verbindung mit der Verwendung konventioneller, nicht-korngrößenstabilisierter anstelle von superplastischen Werkstoffen eine erheblich kostengünstigere Bauteilfertigung mit hohen Umformgraden sichergestellt, ohne dass sich der schmelzpunktnahe Erwärmungszustand der Blechplatinen nachteilig auf die Materialeigenschaften des fertigen Hohlbauteils auswirkt, mit dem weiteren, insbesondere für eine Serienfertigung bedeutsamen Effekt, dass sich aufgrund der verkürzten Taktzeiten zugleich auch entsprechend erhöhte Produktionsraten erzielen lassen.According to the invention is essential compared to the known methods Shortening the heating and deformation phase is a nuisance Structural transformation of materials that are sensitive in this regard is prevented and in connection with the use of conventional, non-grain size stabilized instead of superplastic materials, a much cheaper one Component manufacturing with high degrees of forming ensured without the melting point of the sheet metal near the melting point is disadvantageous affects the material properties of the finished hollow component, with the further, Effect that is particularly significant for series production Due to the shorter cycle times, correspondingly higher production rates let achieve.

Als besonders vorteilhaft hat es sich erwiesen, die Erwärmungs- und Verformungsphase auf einen Zeitraum von etwa 5 Minuten zu begrenzen. Im Rahmen der Erfindung werden vorzugsweise konventionelle Aluminiumbleche oder solche aus einer nicht-korngrößenstabilisierten Aluminiumlegierung bei einem Temperaturniveau von etwa 500 °C innendruckverformt. In weiterer, besonders bevorzugter Ausgestaltung der Erfindung werden die Blechplatinen nach dem Einlegen in das Formwerkzeug auf dem Wege über eine in dieses integrierte Heizeinrichtung erwärmt, wodurch einerseits Zeitverluste, die beim Aufheizen der Platinen außerhalb des Formwerkzeugs entstehen, vermieden werden und andererseits - anders als beim Erwärmen der Blechplatinen mit Hilfe eines erhitzten Druckmediums - eine exakte, zeitlich getrennte Steuerung von Aufheizund Verformungsvorgang ermöglicht wird.The heating and deformation phase has proven to be particularly advantageous limited to a period of about 5 minutes. As part of The invention preferably uses conventional aluminum sheets or the like made of a non-grain size stabilized aluminum alloy at one Temperature level of about 500 ° C deformed inside. In another, especially preferred embodiment of the invention, the sheet metal plates according to the Insert into the mold on the way via an integrated in this Heater heats up, which on the one hand wastes time when heating up the blanks are created outside the mold, avoided and on the other hand - unlike when heating the sheet metal plates with the help of a heated one Pressure medium - an exact, time-separate control of heating and Deformation process is made possible.

Die Innendruckverformung erfolgt zweckmäßigerweise mit Hilfe eines gasförmigen Druckmediums, im einfachsten Fall Luft, unter einem Druck von normalerweise 20 bis 40 bar bis hin zu Druckwerten von ca. 250 bar, falls z. B. scharfkantige Eckbereiche an den Hohlbauteilen ausgeformt werden sollen. Um sicherzustellen, dass die Blechplatinen unter der Wärmeeinwirkung nicht an ihren an die Schweißnaht angrenzenden Kontaktflächen zusammenschmelzen, werden diese zweckmäßigerweise mit einem Trennmittel partiell vorbeschichtet. Die konstruktive Steifigkeit der Hohlbauteile schließlich lässt sich dadurch auf fertigungstechnisch einfache Weise erhöhen, dass zwischen den äußeren Blechplatinen zumindest eine werkstoffgleiche Innenplatine angeordnet und randseitig mit diesen verschweißt wird, welche sich beim Aufweiten der Außenplatinen zu einem den Hohlkörper durchsetzenden Versteifungsblech verformt.The internal pressure deformation is expediently carried out with the aid of a gaseous one Pressure medium, in the simplest case air, under a pressure of normally 20 to 40 bar up to pressure values of approx. 250 bar, if z. B. sharp-edged corner areas are to be formed on the hollow components. To ensure that the sheet metal boards are not under the influence of heat melt together at their contact surfaces adjacent to the weld seam, these are advantageously partially precoated with a release agent. Finally, the structural rigidity of the hollow components can be thereby increase in a technically simple manner that between the outer sheet metal plates arranged at least one inner plate of the same material and is welded to the edge of these, which is when the Outer boards to a stiffening plate passing through the hollow body deformed.

Die Erfindung wird nunmehr anhand zweier Ausführungsbeispiele in Verbindung mit den Zeichnungen näher erläutert. Diese zeigen in stark schematisierter Darstellung in

Fig. 1a, b
zwei aufeinanderfolgende Fertigungsstufen eines Hohlbauteils a.) nach dem Einlegen der Blechplatinen in das Formwerkzeug und b.) nach Beendigung des Umformprozesses; und
Fig. 2a, b, c
den Fertigungsablauf für ein modifiziertes, innenblechversteiftes Hohlbauteil a.) vor Beginn, b.) in einer Zwischenstufe und c.) nach Beendigung des Umformvorgangs.
The invention will now be explained in more detail using two exemplary embodiments in conjunction with the drawings. These show in a highly schematic representation in
1a, b
two successive manufacturing stages of a hollow component a.) after inserting the sheet metal blanks into the mold and b.) after the forming process has ended; and
2a, b, c
the production process for a modified, inner sheet reinforced hollow component a.) before the start, b.) in an intermediate stage and c.) after the forming process has ended.

Bei dem anhand der Fig. 1 erläuterten Umformverfahren zur Herstellung eines im Querschnitt geschlossenen Hohlbauteils 1 werden zunächst zwei Blechplatinen 2, 3 mit einer Wandstärke von jeweils einigen mm aus konventionellem, nicht-korngrößenstabilisierten Aluminium oder einer ebensolchen Aluminiumlegierung, welche an ihren Kontaktflächen - mit Ausnahme eines schmalen Randstreifens - mit einer siliziumnitridhaltigen, gestrichelt dargestellten Trennmittelschicht 4 belegt sind, unter Zwischenschaltung einer Drucklanze 5 in ein insgesamt mit 6 bezeichnetes Formwerkzeug eingelegt. Dieses besteht aus einem mit einer der Außenkontur des Hohlbauteils 1 entsprechenden Formkavität 7 versehenen Werkzeugober- und -unterteil 8, 9, welche auf der Außenseite jeweils von einer Wärmeisolationsschicht 10 umschlossen sind und durch eine Heizeinrichtung 11 kontinuierlich auf einem nahe dem Schmelzpunkt der Blechplatinen 2, 3 liegenden Temperaturniveau von etwa 500 °C gehalten werden. Zur Überwachung des Temperaturniveaus sind im Bereich der Formkavität 7 und im Randbereich der Blechplatinen 2, 3 jeweils Temperatursensoren 12 angeordnet.In the forming process explained with reference to FIG. 1 for producing a The hollow component 1, which is closed in cross section, is initially two sheet metal blanks 2, 3 with a wall thickness of a few mm each from conventional, non-grain size stabilized aluminum or an aluminum alloy, which on their contact surfaces - with the exception of a narrow one Edge strip - with a silicon nitride, shown in dashed lines Release agent layer 4 are occupied, with the interposition of a pressure lance 5 placed in a mold designated 6 overall. This exists from one with one corresponding to the outer contour of the hollow component 1 Mold cavity 7 provided tool upper and lower part 8, 9, which on the Are each surrounded by a heat insulation layer 10 and by a heater 11 continuously at a near the melting point the metal plates 2, 3 lying temperature level of about 500 ° C. being held. To monitor the temperature level are in the area the mold cavity 7 and in the edge region of the sheet metal plates 2, 3 each temperature sensors 12 arranged.

Nach dem Einlegen der Blechplatinen 2, 3 werden die Werkzeugteile 8, 9 zusammengefahren und die Blechplatinen 2, 3 unter der Druckwirkung der Werkzeugteile 8, 9 und der gleichzeitigen, schmelzpunktnahen Erwärmung an ihren trennmittelfreien Randzonen miteinander preßverschweißt, während eine Schmelzbindung an den übrigen Kontaktflächen infolge der Trennmittelbeschichtung 4 unterbunden wird.After inserting the sheet metal blanks 2, 3, the tool parts 8, 9 are moved together and the sheet metal plates 2, 3 under the pressure effect of the tool parts 8, 9 and the simultaneous, near melting point heating on their Release agent-free edge zones are pressure-welded to one another, while a Melt bond on the other contact surfaces due to the release agent coating 4 is prevented.

Anschließend werden die Blechplatinen 2, 3 über die Drucklanze 5 mit einem Druckmedium, z. B. Druckluft, innendruckbeaufschlagt und dadurch bis zur Anlage an der Formkavität 7 des Formwerkzeugs 6 aufgeweitet, so dass der in Fig. 1b gezeigte Hohlkörper 1 entsteht. Das Druckniveau des Druckmediums liegt dabei normalerweise zwischen 20 und 40 bar, kann jedoch je nach Verformungsgrad und Querschnittsgeometrie des Hohlbauteils 1 bis zu 250 bar angehoben werden.Then the sheet metal plates 2, 3 with a pressure lance 5 Print medium, e.g. B. compressed air, pressurized internally and thereby up to System expanded on the mold cavity 7 of the mold 6, so that the in Fig. 1b shown hollow body 1 is formed. The pressure level of the print medium is usually between 20 and 40 bar, but can vary depending on the degree of deformation and cross-sectional geometry of the hollow component 1 up to 250 bar be raised.

Nach Beendigung des Umformvorgangs wird das Formwerkzeug 6 geöffnet und der Hohlkörper 1 entnommen, woraufhin die Drucklanze 5 abgetrennt, die entstehende Hohlkörperöffnung verschlossen und ein neuer Fertigungszyklus begonnen werden kann. Wesentlich ist, dass die Zeitspanne zwischen dem Aufheizen der Blechplatinen 2, 3 und der Entnahme des Hohlkörpers 1 so kurz bemessen wird, dass eine Gefügeumwandlung der Blechplatinen 2, 3 unterbleibt. Diese Zeitspanne liegt bei konventionellen, nicht-korngrößenstabilisierten Aluminiumplatinen in der Größenordnung von wenigen, nämlich etwa 5 Minuten.After the shaping process has ended, the shaping tool 6 is opened and the hollow body 1 removed, whereupon the pressure lance 5 separated, the resulting Hollow body opening closed and a new production cycle started can be. It is essential that the time between heating up the metal plates 2, 3 and the removal of the hollow body 1 so short is dimensioned that a structural transformation of the sheet metal plates 2, 3 is omitted. This period of time is conventional, not grain size stabilized Aluminum boards on the order of a few, namely about 5 Minutes.

Die Ausführungsform nach Fig. 2, wo die dem ersten Ausführungsbeispiel entsprechenden Komponenten durch ein um 100 erhöhtes Bezugszeichen gekennzeichnet sind, unterscheidet sich von diesem in erster Linie durch einen anders aufgebauten Platinenverbund, welcher hier aus z. B. durch Laserstrahlnähte 13, 14 randseitig miteinander vorverschweißten Außen- und kleineren, von Durchlassöffnungen 15 durchsetzten Innenplatinen 102, 103 bzw. 16, 17 wiederum aus konventionellem, nicht-korngrößenstabilisierten Aluminium oder einer gleichartigen Aluminiumlegierung besteht. Aus Fig. 2b ist ersichtlich, wie die Außenplatinen 102, 103 unter der Innendruckwirkung und der gleichzeitigen, schmelzpunktnahen Erwärmung ballonartig aufgeweitet und zugleich die Innenplatinen 16, 17 gestreckt werden, bis am Ende des thermischen Umformprozesses (Fig. 2c) ein im Querschnitt geschlossenes Hohlbauteil 101 mit scharfkantigen Eckbereichen und durch die Innenplatinen 16, 17 gebildeten, parallel zur Verbindungsnaht 13 der Außenplatinen 102, 103 verlaufenden Versteifungsblechen entsteht. Aufgrund der rechteckförmigen Querschnittsgeometrie des Hohlbauteils 101 muss in diesem Fall mit wesentlich höheren Innendrücken in der Größenordnung von 200 bar gearbeitet werden. Im Übrigen ist die Verfahrensweise sowohl hinsichtlich der formwerkzeugseitigen Aufheizung als auch hinsichtlich der auf wenige Minuten begrenzten Zeitspanne zwischen dem Einlegen des Platinenverbunds und dem Entformen des Hohlbauteils 101 die gleiche wie bei dem ersten Ausführungsbeispiel.The embodiment of Fig. 2, where the corresponding to the first embodiment Components identified by a reference numeral increased by 100 differs from this primarily by one differently constructed board assembly, which here from z. B. by laser beam seams 13, 14 outer and smaller pre-welded edges, Inner boards 102, 103 or 16, 17 penetrated by passage openings 15 again from conventional, non-grain size stabilized aluminum or a similar aluminum alloy. 2b shows how the outer boards 102, 103 under the internal pressure effect and the simultaneous, heating near the melting point expanded like a balloon and at the same time the Inner blanks 16, 17 are stretched until the end of the thermal forming process (Fig. 2c) a closed in cross-section 101 with sharp-edged corner areas and formed by the inner boards 16, 17, extending parallel to the connecting seam 13 of the outer boards 102, 103 Stiffening plates are created. Due to the rectangular cross-sectional geometry of the hollow component 101 must in this case with significantly higher internal pressures work in the order of 200 bar. Furthermore is the procedure both with regard to the heating on the mold side as well as the limited time between the insertion of the board assembly and the demolding of the hollow component 101 is the same as in the first embodiment.

Claims (7)

Thermisches Innendruck-Umformverfahren, bei dem randseitig miteinander verschweißte Metallplatinen in ein Formwerkzeug eingelegt, bis nahe der Schmelztemperatur der Metallplatinen erwärmt und im erwärmten Zustand durch Einleiten eines Druckmediums zwischen die Platinen bis zur Anlage an der Formkavität des Formwerkzeugs zu einem Hohlkörper aufgeweitet und anschließend aus dem Formwerkzeug entformt werden, dadurch gekennzeichnet, dass die Metallplatinen aus einem nicht korngrößenstabilisierten Werkstoff bestehen und für die Erwärmungs- und Innendruckverformungsphase der Metallplatinen eine kurze, unterhalb der Gefügeumwandlungszeit des nicht korngrößenstabilisierten Werkstoffs bei Erwärmungstemperatur liegende Zeitspanne von wenigen Minuten eingehalten wird. Thermal internal pressure forming process in which metal plates welded together at the edges are placed in a mold, warmed up to near the melting temperature of the metal plates and expanded in the heated state by introducing a pressure medium between the plates until they come into contact with the mold cavity of the mold to form a hollow body and then from the Mold can be removed from the mold, characterized in that the metal boards consist of a material that is not grain size stabilized and for the heating and internal pressure deformation phase of the metal blanks, a short period of a few minutes below the microstructural transformation time of the non-grain size stabilized material at the heating temperature is observed. Umformverfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Erwärmungs- und Innendruckverformungsphase innerhalb einer Zeitspanne von etwa 5 Minuten gehalten wird.Forming method according to claim 1, characterized in that the heating and internal pressure deformation phase is held within a period of about 5 minutes. Umformverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die nicht-korngrößenstabilisierten Metallplatinen aus Aluminium oder einer Aluminiumlegierung bestehen und auf eine Temperatur von etwa 500 °C erwärmt werden. Forming method according to claim 1 or 2, characterized in that the non-grain size stabilized metal plates consist of aluminum or an aluminum alloy and are heated to a temperature of about 500 ° C. Umformverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
die Metallplatinen nach dem Einlegen in das Formwerkzeug auf dem Wege über eine in dieses integrierte Heizeinrichtung erwärmt werden.Forming method according to one of the preceding claims, characterized in that
the metal blanks are heated after insertion into the mold on the way via a heating device integrated in this. Umformverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
die Metallplatinen mit einem Innendruck von maximal 250 bar druckgasverformt werden.Forming method according to one of the preceding claims, characterized in that
the metal blanks are compressed gas-compressed with an internal pressure of maximum 250 bar. Umformverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
die Metallplatinen an ihren an die Schweißnaht angrenzenden Kontaktflächen mit einem Trennmittel beschichtet werden.Forming method according to one of the preceding claims, characterized in that
the metal boards are coated with a release agent at their contact surfaces adjacent to the weld seam. Umformverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
zwischen die äußeren Metallplatinen zumindest eine weitere, randseitig mit den Außenplatinen verschweißte und nach dem Aufweiten der Außenplatinen ein den Hohlkörper durchsetzendes Innenblech bildende Metallplatine eingesetzt wird.Forming method according to one of the preceding claims, characterized in that
between the outer metal plates, at least one further metal plate, welded on the edge to the outer plates and, after the outer plates have widened, forms an inner plate which penetrates the hollow body.
EP02020724A 2001-10-27 2002-09-14 Method for thermal hydroforming Expired - Lifetime EP1306145B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10153139A DE10153139A1 (en) 2001-10-27 2001-10-27 Thermal internal pressure forming process
DE10153139 2001-10-27

Publications (2)

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EP1306145A1 true EP1306145A1 (en) 2003-05-02
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Cited By (8)

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Publication number Priority date Publication date Assignee Title
EP2102034A1 (en) * 2006-12-14 2009-09-23 ErlingKlinger AG Shielding component, in particular heat shield
CN102284587A (en) * 2011-04-21 2011-12-21 上海板换机械设备有限公司 Heat radiating plate pair expansion forming process
CN102873166A (en) * 2012-10-19 2013-01-16 上海桦厦实业有限公司 Aircraft spherical shell isothermal forming method and device
CN103567271A (en) * 2013-10-11 2014-02-12 中航飞机股份有限公司西安飞机分公司 Inflating thermal-expansion forming method for titanium alloy panel
EP2099650B1 (en) * 2006-12-14 2014-06-11 ElringKlinger AG Method for adjusting a heat shield
US10737308B2 (en) 2016-09-19 2020-08-11 Zapadoceska Univerzita V Plzni Method of producing hollow objects and an arrangement for such method
EP4129521A1 (en) * 2021-08-05 2023-02-08 Airbus Operations SAS Method and device for manufacturing a part from a cushion made from deformable material, in particular for an edge of an element of an aircraft
US11833566B2 (en) 2021-08-05 2023-12-05 Airbus Operations (S.A.S.) Method and device for manufacturing a part from a plate made of a formable material, in particular for the edge of an element of an aircraft

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
DE102008045441B3 (en) * 2008-09-02 2010-02-18 Otto Fuchs Kg Producing extrusion profile section calibrated with respect to its outer contour and made of hardenable aluminum alloy, by subjecting profile section to solution-annealing, and cooling the solution-annealed section at ambient temperature

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DE2361215A1 (en) * 1973-12-08 1975-06-12 Volkswagenwerk Ag Closed container made from two sheet metal plates - which are simultaneously formed on single press tool
DE19531035A1 (en) * 1995-08-23 1997-02-27 Alcan Gmbh Procedure for moulding of flat workpieces
DE19946290A1 (en) * 1999-09-27 2001-04-12 Vaw Ver Aluminium Werke Ag Procedure for manufacture of fuel tank for cars has tubular plate part made out of tube by internal high pressure deformation and ends are closed by closing plate part.

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DE2361215A1 (en) * 1973-12-08 1975-06-12 Volkswagenwerk Ag Closed container made from two sheet metal plates - which are simultaneously formed on single press tool
DE19531035A1 (en) * 1995-08-23 1997-02-27 Alcan Gmbh Procedure for moulding of flat workpieces
DE19946290A1 (en) * 1999-09-27 2001-04-12 Vaw Ver Aluminium Werke Ag Procedure for manufacture of fuel tank for cars has tubular plate part made out of tube by internal high pressure deformation and ends are closed by closing plate part.

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2102034A1 (en) * 2006-12-14 2009-09-23 ErlingKlinger AG Shielding component, in particular heat shield
EP2099650B1 (en) * 2006-12-14 2014-06-11 ElringKlinger AG Method for adjusting a heat shield
CN102284587A (en) * 2011-04-21 2011-12-21 上海板换机械设备有限公司 Heat radiating plate pair expansion forming process
CN102873166A (en) * 2012-10-19 2013-01-16 上海桦厦实业有限公司 Aircraft spherical shell isothermal forming method and device
CN102873166B (en) * 2012-10-19 2014-12-24 上海桦厦实业有限公司 Aircraft spherical shell isothermal forming method and device
CN103567271A (en) * 2013-10-11 2014-02-12 中航飞机股份有限公司西安飞机分公司 Inflating thermal-expansion forming method for titanium alloy panel
US10737308B2 (en) 2016-09-19 2020-08-11 Zapadoceska Univerzita V Plzni Method of producing hollow objects and an arrangement for such method
EP4129521A1 (en) * 2021-08-05 2023-02-08 Airbus Operations SAS Method and device for manufacturing a part from a cushion made from deformable material, in particular for an edge of an element of an aircraft
FR3125975A1 (en) * 2021-08-05 2023-02-10 Airbus Operations Method and device for manufacturing a part from a cushion of deformable material, in particular for an edge of an aircraft element.
US11833566B2 (en) 2021-08-05 2023-12-05 Airbus Operations (S.A.S.) Method and device for manufacturing a part from a plate made of a formable material, in particular for the edge of an element of an aircraft
US12011754B2 (en) 2021-08-05 2024-06-18 Airbus Operations (S.A.S.) Method and a device for manufacturing a part starting from a cushion made of deformable material, in particular for an edge of an element of an aircraft

Also Published As

Publication number Publication date
EP1306145B1 (en) 2004-09-01
DE50200917D1 (en) 2004-10-07
ES2225707T3 (en) 2005-03-16
DE10153139A1 (en) 2003-05-08

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