EP2363217B1 - Vorrichtung zum Umformen von Werkstücken durch lokale Erwärmung - Google Patents

Vorrichtung zum Umformen von Werkstücken durch lokale Erwärmung Download PDF

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Publication number
EP2363217B1
EP2363217B1 EP11153208.1A EP11153208A EP2363217B1 EP 2363217 B1 EP2363217 B1 EP 2363217B1 EP 11153208 A EP11153208 A EP 11153208A EP 2363217 B1 EP2363217 B1 EP 2363217B1
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EP
European Patent Office
Prior art keywords
workpiece
forming
tool
inductor
conductor elements
Prior art date
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Active
Application number
EP11153208.1A
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English (en)
French (fr)
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EP2363217A1 (de
Inventor
Valérie FRUSTIE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Operations SAS
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Airbus Operations SAS
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Publication of EP2363217A1 publication Critical patent/EP2363217A1/de
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • 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 present invention relates to a forming device of parts comprising localized hot forming, according to the preamble of claim 1.
  • the device of the invention is particularly applicable to the forming of very large thick parts having no cold forming ability.
  • a material known to be unsuitable for cold forming is the titanium alloy known under the acronym TA6Vbeta.
  • Hot forming results in greater elongation before breaking than when deforming a cold material.
  • the device of the invention implements localized hot forming which differs from hot forming which consists of a general heating of the workpiece and the tool.
  • the device of the invention uses induction heating so that only the part to be deformed is heated.
  • This device is used on cold presses which are much more common and less costly in investment than hot presses.
  • Localized heating forming devices are known and in particular the document DE-A-102 33 911 discloses a method and a forming device for which a heater is disposed in an angle of a die.
  • Induction heating is known in applications where the room is heated in its entirety. It is used in this case before forming. It is also known in tube bending applications and in these applications an inductor surrounds a section of the tube to be bent.
  • the device according to the present invention can be used in a parts forming process which comprises a step of positioning a workpiece in a cold press, at least one step of applying an induction field located adapted to carry an identified portion of the workpiece at a temperature adapted to the deformation of said portion and at least one step of applying a deformation tool to said identified heated portion, the tool forming a hot forming of the identified party.
  • the step of positioning the workpiece in a cold press advantageously comprises positioning the workpiece on a lower die and laying without pressure on the workpiece of an upper die comprising the inductor.
  • the step of applying the induction field is adapted to produce a localized heating of the part of the part to be deformed up to the deformation temperature.
  • the step of applying a tool is advantageously carried out by pressing the upper die onto the workpiece and pressurizing the workpiece between the lower die and the upper die.
  • the pressurization of the piece is performed by locking the tool.
  • the invention provides an induction forming device according to the features of claim 1.
  • the device of the invention is adapted to follow a profile of the part to be heated without surrounding the part to be heated, the inductive field being able to extend in a direction perpendicular to a plane containing the conductor elements.
  • the device of the invention advantageously comprises a field concentrator device disposed on the conductor elements and extending said part-side elements.
  • the field concentrator device is advantageously designed in the form of ferrite bars covering a flat face of the conductor elements opposite the part to be formed.
  • the invention finally relates to a forming tool, comprising an induction forming device according to the invention, which comprises a frame of electrical insulating material provided with grooves receiving the parallel conductive elements and the bars, the frame being integrated in a suitable matrix to be applied to a workpiece to be formed and comprising an electrical insulating plate covering the face of the device facing the workpiece.
  • the inductor is made with two parallel bars connected to one another at their ends and connected to a current generator at one second from their ends.
  • the Figure 1A schematically represents a cold press portion comprising the localized heating forming device of the invention.
  • the press comprises a base 100 receiving a lower die 1b of a forming tool and an upper portion shown diagrammatically under the reference 101 receiving an upper die 1a of the forming tool.
  • the part 2 to be formed is received between the two dies 1a, 1b of the tool and the press comprises means making it possible to press the upper die onto the workpiece, for example claving means schematized under the reference 102.
  • the localized induction heating device 4 of the part is arranged in a housing of the upper die of the tool facing the part to be heated and bent.
  • the workpiece 2 is positioned in the cold press 1 comprising the inductor device 4, between the two dies 1a, 1b of the forming tool as shown in FIG. Figure 1A .
  • the forming is done using at least one application step, by means of the inductor, of a localized induction field adapted to carry an identified part of the workpiece at a temperature adapted to the deformation. of said part.
  • This step is done according to the example with the upper matrix in contact with the workpiece without pressing the workpiece as shown in FIG. Figure 1B .
  • To perform the folding is carried out at least one step of applying the deformation tool comprising the matrices 1a, 1b on said identified portion heated, the tool performing a hot forming of the identified part.
  • the step of positioning the workpiece in the cold press comprises positioning the workpiece on the lower die 1b according to the Figure 1A and laying without pressure on the part of the upper die 1 having the inductor 4 as shown in FIG. Figure 1B .
  • the step of applying the induction field is adapted to produce a localized heating of the part of the part to be deformed up to the deformation temperature of the part as represented by a shaded area at the Figure 1B .
  • the step of applying a tool is performed by pressing the upper die 1a on the workpiece and pressurizing the workpiece between the lower die 1b and the upper die 1a diagrammed in FIG. figure 1C , the localized heating being maintained the time of the descent of the upper die to form the part.
  • the pressurization of the part is carried out for example by locking the tool as shown schematically in FIG. figure 1C , a system with keys 102 sinking into housings of the upper portion 101 of the press to press the upper die 1 a.
  • a panel forming range may thus comprise a positioning of the machined panel in the shaping tool, the positioning of the inductor in the upper die simply placed on the panel without pressure, the passage under a key press, the positioning of the die on the upper plate of the press, a descent of the upper plate to the vicinity of the non-contact panel, heating to the target temperature for folding or forming the workpiece , a lowering of the upper plate and pressurization by a keying of the tool and then include a withdrawal of the inductor after unclamping the tool of the upper plate these operations being followed by a set up of combs and a rolling punch and a detent treatment of the part in the furnace under controlled atmosphere.
  • the forming device represented as a whole in figure 2 and exploded into figure 3 comprises an inductor 4 comprising at least two parallel conductor elements 5a, 5b.
  • the conductive elements are interconnected at a first end 51 and connected to a current generator I at one second of their ends 52a, 52b.
  • the conductor elements are traversed by an electric current supplied by the generator and are adapted to generate, as a function of this current, an inductive field extending from one conductor element to the other along a curve centered on the passing axis between the two elements of conductors, as shown schematically in figure 2 .
  • the induction heating means formed by the conductive elements constitutes a flat coil for generating an inductive field without surrounding the part.
  • the inductor device comprises a field concentrator device 7a, 7b disposed on the conductor elements and extending said elements opposite to the workpiece.
  • the field concentrator device 7a, 7b is made in the form of ferrite bars placed on the conductive elements so that they cover a flat face of the conductor elements opposite to the part to be formed.
  • the ferrite bars here are of width equivalent to the width of the conductive elements.
  • These ferrite bars can be made from a plurality of ferrite elements bonded to each other.
  • the inductive device is adapted to follow a profile of the part to be heated without surrounding the part to be heated, the inductive field extending in a direction perpendicular to a plane containing the conductor elements and forming an arch connecting the conductive elements.
  • the inductor device is housed in the upper die and the heating means can be inserted directly into the forming punch as close as possible to the zone to be deformed.
  • the inductor device is mounted in a frame 8 of electrical insulating material provided with grooves receiving the parallel conductive elements 5a, 5b and the bars of the field concentrator device, the frame being integrated into the matrix of the tool adapted to to apply on a piece.
  • the frame comprises an electrical insulating plate 9 covering the face of the device facing the workpiece and the various components of the device are mounted on this plate which will come into contact with the workpiece during forming.
  • This construction by means of a frame makes it possible to produce a forming tool comprising an induction forming device for which the frame carrying said device is integrated in a matrix adapted to be applied on a part to be formed.
  • the parts referred to today by this method have a length of 5m. and are for example aircraft structural elements such as titanium-based alloy stiffening panels, examples of which are shown in FIGS. Figures 5 and 6 , for example reactor mast structure elements.
  • an interesting aspect of the invention is that a method using the device of the invention does not apply only to flat parts and in particular, it will be noted that the panel of the Figure 6A has flanks folded 21, for example obtained by machining in the mass of the panel and folded along axes perpendicular to the folding axis P to be produced by the method of using the device of the invention.
  • the folding to be done is schematized at the Figure 6B at an angle ⁇ .
  • the device represented in figure 4 includes a solution applicable in such a case by a particular conformation of the elements.
  • the inductor is shaped according to the area to be deformed which allows to design deformations along a line or a surface.
  • the part 2c to be formed comprises folds along axes perpendicular to the axis P to be folded by the method of the invention.
  • first planar portion 20a at a first height
  • second planar portion 20c at a second height different from the first and an inclined portion of connection between the first and second planar portions.
  • the induction device comprises in this case two parallel conductive elements 6a, 6b having segments 61a, 62a, 63a and 61b, 62b, 63b which follow the curvature of the part along the axis P of folding.
  • the elements 6a, 6b, 6c are interconnected at a first of their ends and connected to a current generator at the second of their ends.
  • the bar elements 7a, 7b of the field concentrator device follow the profile of conductive elements.
  • the part can be folded along the axis P despite its complex shape.
  • the induction technology has the advantage of homogeneous heating in the thickness in a very short time and, even for the high thicknesses, the heating time is reduced to a few minutes against hours in a heating press.
  • the device of the invention is not limited to the examples shown and also makes it possible to combine several types of deformations, for example a cold elongation and a hot flow, without departing from the scope of the invention as defined in the claims. .

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • General Induction Heating (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (6)

  1. Vorrichtung zum Induktionsumformen
    für ein Verfahren zum Umformen von Werkstücken, das einen Schritt zur Anordnung eines Werkstücks (2, 2a) in einer Kaltpresse (1), die einen Induktor (4) aufweist, mindestens einen Schritt zum Beaufschlagen, mittels des Induktors, eines lokalen Induktionsfelds, das geeignet ist, einen identifizierten Teil (10) des Werkstücks auf eine Temperatur zu bringen, die für die Verformung des Teils geeignet ist, und mindestens einen Schritt zum Anwenden eines Verformungswerkzeugs (1a, 1b) auf dem identifizierten, erwärmten Teil aufweist, wobei das Werkzeug eine Warmumformung des identifizierten Teils durchführt,
    dadurch gekennzeichnet, dass der Induktor (4) mindestens zwei parallele leitenden Elemente (5a, 5b, 6a, 6b) aufweist, die jeweils an einem ersten Ende miteinander verbunden sind und an einem zweiten Ende mit einem Stromgenerator verbunden sind, wobei durch die leitenden Elemente ein elektrischer Strom fließt und sie geeignet sind, ein induktives Feld zu erzeugen, das sich von einem leitenden Element zum anderen gemäß einer Kurve erstreckt, die auf der Achse zentriert ist, die zwischen den beiden leitenden Elementen verläuft, wobei die Induktorvorrichtung nur auf einer Seite des zu erwärmenden Werkstücks angelegt wird, ohne es zu umgeben.
  2. Vorrichtung zum Induktionsumformen nach Anspruch 1, dadurch gekennzeichnet, dass die leitenden Elemente Segmente (61a, 62a, 63a et 61b, 62b, 63b) aufweisen, die der Krümmung des Werkstücks gemäß einer Biegeachse (P) des Werkstücks folgen.
  3. Vorrichtung zum Induktionsumformen nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sie eine Feldkonzentratorvorrichtung (7a, 7b) aufweist, die auf den leitenden Elementen angeordnet ist und die die Elemente auf der Seite verlängert, die dem Werkstück gegenüberliegt.
  4. Vorrichtung zum Induktionsumformen nach Anspruch 3, dadurch gekennzeichnet, dass die Feldkonzentratorvorrichtung (7a, 7b) in Form von Ferritstäben ausgeführt ist, die eine ebene Seite der leitenden Elemente bedecken, die dem Werkstück gegenüberliegt.
  5. Werkzeug zum Umformen, das eine Vorrichtung zum Induktionsumformen nach Anspruch 4 aufweist, dadurch gekennzeichnet, dass es einen Rahmen (8) aus elektrisch isolierendem Material aufweist, der mit Rillen versehen, die die parallelen leitenden Elemente und die Stäbe aufnehmen, wobei der Rahmen in eine Matrix integriert ist, die geeignet ist, sich an ein umzuformendes Werkstück anzupassen und der eine isolierende elektrische Platte (9) aufweist, die die Seite bedeckt, die dem Werkstück gegenüberliegt.
  6. Werkzeug zum Umformen nach Anspruch 5, dadurch gekennzeichnet, dass es Mittel zum Verkeilen des Werkzeugs aufweist, die geeignet sind, eine Beaufschlagung des Werkstücks mit Druck durchzuführen.
EP11153208.1A 2010-02-05 2011-02-03 Vorrichtung zum Umformen von Werkstücken durch lokale Erwärmung Active EP2363217B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1050825A FR2956047B1 (fr) 2010-02-05 2010-02-05 Procede et dispositif de formage de pieces comportant un formage a chaud localise

Publications (2)

Publication Number Publication Date
EP2363217A1 EP2363217A1 (de) 2011-09-07
EP2363217B1 true EP2363217B1 (de) 2015-11-25

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FR (1) FR2956047B1 (de)

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CN115318890A (zh) * 2022-06-28 2022-11-11 江苏普力重工科技有限公司 一种智能制造卷板机床现场总线控制机构及控制系统

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DE10128199B4 (de) * 2001-06-11 2007-07-12 Benteler Automobiltechnik Gmbh Vorrichtung zur Umformung von Metallblechen
DE10233911A1 (de) * 2002-07-25 2004-02-19 Webasto Vehicle Systems International Gmbh Werkzeug und Verfahren zum Umformen von lackierten Blechen
DE102005018240B4 (de) * 2005-04-19 2010-11-18 Benteler Automobiltechnik Gmbh Vorrichtung zum Umformen von Metallblechen
DE102007054782A1 (de) * 2007-11-16 2009-05-20 Mtu Aero Engines Gmbh Induktionsspule, Verfahren und Vorrichtung zur induktiven Erwärmung von metallischen Bauelementen

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EP2363217A1 (de) 2011-09-07
FR2956047B1 (fr) 2012-06-22
FR2956047A1 (fr) 2011-08-12

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