EP2559499A1 - Incremental forming method and device - Google Patents

Incremental forming method and device Download PDF

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Publication number
EP2559499A1
EP2559499A1 EP12178446A EP12178446A EP2559499A1 EP 2559499 A1 EP2559499 A1 EP 2559499A1 EP 12178446 A EP12178446 A EP 12178446A EP 12178446 A EP12178446 A EP 12178446A EP 2559499 A1 EP2559499 A1 EP 2559499A1
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EP
European Patent Office
Prior art keywords
sheet
hot
incremental
incremental forming
forming
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EP12178446A
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German (de)
French (fr)
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EP2559499B1 (en
Inventor
Bernard Duprieu
Nicolas Guegan
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Airbus Operations SAS
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Airbus Operations SAS
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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
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/005—Incremental shaping or bending, e.g. stepwise moving a shaping tool along the surface of the workpiece
    • 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
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles

Definitions

  • the invention relates to a method of incremental forming sheet metal parts, and a hot incremental forming device adapted to implement it.
  • the field of the invention is that of the forming of sheet metal parts by incremental forming.
  • a machine which may be a robot or any other machine of 3-axis type or more
  • a forming tool with rolling or rigid end;
  • the movements of the tool are controlled by a digital processor under the control of software.
  • the tool moves in a horizontal plane according to a parametric trajectory defined by the software then, by successive vertical incremental jumps, according to trajectories based on the geometry to be formed in parallel horizontal planes.
  • the incremental forming in "dieless” or “partial die” configuration does not make it possible to form parts of complex geometries nor to obtain acceptable accuracies with certain materials such as stainless steels or titanium alloys. Indeed, the elongations tolerated by this technology limit the geometry of the pieces to achieve. Thus, for certain geometries, risks of damage appear: the sheet can tear and cracks can form.
  • elastic deformations may occur due to the elastic return of some alloys after forming. This elastic return then forces to modify the trajectories of the tool to anticipate this phenomenon, but this anticipation does not make it possible to obtain a final geometry of the satisfactory piece.
  • the invention aims to overcome these disadvantages by proposing to raise the temperature of the sheet during the incremental forming and in a particular configuration.
  • the subject of the invention is a method of incrementally forming sheet metal in a configuration devoid of a carrier matrix (of the "dieless” or “partial die” type), in which, after a rise in temperature, a heating is carried out under the sheet to be formed and kept substantially constant in temperature during the duration of the incremental forming.
  • Such hot incremental forming promotes the formability of the sheet by reducing the forces required for forming and elastic return caused by forming.
  • the possibilities of incremental forming of complex parts and the precision of the formed parts are thus significantly improved.
  • the temperature of the heating can be raised to different temperature levels depending on the material to be formed, for example between 600 and 800 ° C for titanium alloys.
  • the invention also relates to a hot forming device particularly suitable for this process.
  • This device comprises a frame comprising means for positioning the sheet to be formed, and an insulating box disposed in the frame and arranged to thermally isolate heating means, in particular halogen or infrared lamps or equivalent. These heating means are arranged in the box so as to be able to heat the sheet by its lower face turned towards the inside of the frame.
  • the figure 1 illustrates the principle of incremental forming without tools, that is to say without a sheet metal support matrix.
  • a tool of forming 1 - here a tool of 3-axis type - moves along a path T on the sheet 2 to be formed, initially flat.
  • the tool is guided by a machine, a robot R in the example, and its trajectory is parameterized by a digital processing unit 3 of the robot.
  • the sheet 2 is connected to the frame by the link 10
  • the tool 1 deforms the sheet 2 according to zones Z1, Z2,..., Zi, parallel to the trajectory T.
  • the tool passes from one zone Zi to another by a step of increment "I" of perpendicular displacement in the plane of the plate 2.
  • the amplitude of the increment is also set by the unit 3.
  • the invention exploits the lowering of the mechanical characteristics of a sheet when passing from a cold deformation domain D1 to a heat deformation field D2, as illustrated by FIG. figure 2 for a titanium alloy sheet.
  • the cold deformation domain D1 when the elongation "A" of a stress test specimen "C” increases, the cold variation curve C1 passes from a linear variation C10, corresponding to a field of elastic strain to a nonlinear variation C11 defining a plastic strain domain.
  • the value of the stress at the point R e1 corresponding to the transition between the elastic and plastic domains, defines the elastic limit of the specimen.
  • the plastic strain curve C11 passes through a maximum R m1 , corresponding to the mechanical strength at break.
  • the variation curve C2 changes from a linear variation C20 to a nonlinear variation C21, at the point R e2 of change of domain.
  • the nonlinear variation curve C21 passes through a maximum defining the point Rm2 of mechanical strength at break.
  • the figure 3 illustrates an example of an incremental hot forming apparatus according to the invention.
  • the apparatus 100 comprises a frame 110 lined internally with a thermal insulating box 120.
  • This box is of parallelepipedal shape and comprises five walls, including a base wall 121 and side walls 122, 123 and 124 (only three lateral faces are visible on the sectional view of the figure 3 ). It is open on its upper part, as shown in the figure, located opposite the sheet 2 to be formed.
  • the frame 100 also comprises positioning means 112 of the sheet 2 in the form of a blank holder 114 and a peripheral matrix 116.
  • the sheet 2 is thus positioned on the opposite side to the base face 121 of the box 120.
  • the casing 120 accommodates, on its base wall 121, halogen lamp heating means in the example 130. These lamps are able to heat the sheet 2 from below (arrows F).
  • An auxiliary heating system 140 consisting of resistive heating elements in the example, is arranged in a support 142 under the peripheral matrix 116.
  • This heating system 140 makes it possible to compensate for the thermal losses associated with the fixing and maintenance of the heating element. sheet 2 through the clamp 114 and the matrix 116.
  • This auxiliary system 140 also improves the temperature homogeneity of the entire sheet to form 2.
  • the lamps 130 are heated in the direction of the lower face 2i of the sheet 2 turned towards the inside of the frame 110.
  • the sheet is made of a titanium and aluminum alloy, known under the trade name "TA6V ".
  • the temperature to reach is at least 600 ° C. Once this temperature is reached, the heating is kept substantially constant under the sheet 2 to be formed, at the same time as the incremental forming is made from the upper face 2s of the sheet with the tool 1.
  • the sheet 2 once formed schematically shows the generally curved shape referenced 2f on the figure 3 .
  • the invention is not limited to the examples described or represented above.
  • the positioning means of the sheet may be of any type known to those skilled in the art (clamp, key, etc.).
  • the auxiliary heating system may consist of any suitable means, for example an induction heater or the like.

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

Abstract

The method involves performing heating under a to-be-formed sheet (2) by a heating unit i.e. halogen lamp (130), after rise in temperature, where the heating unit is thermally isolated by a thermal insulation box (120) arranged in a frame (110) that includes a positioning unit (112) for positioning the sheet. Constant temperature is maintained throughout incremental forming of the sheet, where the sheet is surrounded by a peripheral die (116). An independent claim is also included for a device for hot incremental forming of a sheet.

Description

DOMAINE TECHNIQUETECHNICAL AREA

L'invention concerne un procédé de formage incrémental de pièces de tôlerie, ainsi qu'un dispositif de formage incrémental à chaud apte à le mettre en oeuvre.The invention relates to a method of incremental forming sheet metal parts, and a hot incremental forming device adapted to implement it.

Le domaine de l'invention est celui de la mise en forme de pièces de tôlerie par le formage incrémental.The field of the invention is that of the forming of sheet metal parts by incremental forming.

Dans un formage incrémental, avec une matrice partielle simplifiée (« partial die» en terminologie anglaise) ou sans matrice (« dieless » en terminologie anglaise), la tôle est uniquement maintenue en bordure, entre un serre-flan non spécifique et une matrice périphérique - dont la géométrie est adaptée à la pièce à former - en configuration « partial dieless » ou un simple support pour la configuration « dieless ».In an incremental forming, with a simplified partial matrix ("partial die" in English terminology) or without a matrix ("dieless" in English terminology), the sheet is only maintained at the edge, between a nonspecific blank holder and a peripheral matrix - whose geometry is adapted to the part to be formed - in "partial dieless" configuration or a simple support for the "dieless" configuration.

En général, une machine (qui peut être un robot ou tout autre machine de type 3 axes ou plus) est équipée d'un outil de formage à extrémité roulante ou rigide ; Les déplacements de l'outil sont pilotés par un processeur numérique sous le contrôle d'un logiciel. L'outil se déplace dans un plan horizontal selon une trajectoire paramétrique définie par le logiciel puis, par des sauts incrémentaux verticaux successifs, selon des trajectoires s'appuyant sur la géométrie à former dans des plans horizontaux parallèles.In general, a machine (which may be a robot or any other machine of 3-axis type or more) is equipped with a forming tool with rolling or rigid end; The movements of the tool are controlled by a digital processor under the control of software. The tool moves in a horizontal plane according to a parametric trajectory defined by the software then, by successive vertical incremental jumps, according to trajectories based on the geometry to be formed in parallel horizontal planes.

ÉTAT DE LA TECHNIQUESTATE OF THE ART

Cependant, le formage incrémental en configuration « dieless » ou « partial die », ne permet pas de réaliser le formage de pièces de géométries complexes ni d'obtenir des précisions acceptables avec certains matériaux tels que des aciers inoxydables ou des alliages de titane. En effet, les allongements tolérés par cette technologie limitent la géométrie des pièces à réaliser. Ainsi, pour certaines géométries, des risques d'endommagement apparaissent : la tôle peut se déchirer et des criques peuvent se former.However, the incremental forming in "dieless" or "partial die" configuration does not make it possible to form parts of complex geometries nor to obtain acceptable accuracies with certain materials such as stainless steels or titanium alloys. Indeed, the elongations tolerated by this technology limit the geometry of the pieces to achieve. Thus, for certain geometries, risks of damage appear: the sheet can tear and cracks can form.

Par ailleurs, des déformations élastiques peuvent apparaître du fait du retour élastique de certains alliages après formage. Ce retour élastique oblige alors à modifier les trajectoires de l'outil pour anticiper ce phénomène, mais cette anticipation ne permet pas d'obtenir une géométrie finale de la pièce satisfaisante.Moreover, elastic deformations may occur due to the elastic return of some alloys after forming. This elastic return then forces to modify the trajectories of the tool to anticipate this phenomenon, but this anticipation does not make it possible to obtain a final geometry of the satisfactory piece.

De plus certains matériaux, comme ceux déjà cités, nécessitent des efforts importants pour être mis en forme. Et ces efforts risquent de devenir bloquants lorsque la machine n'est pas suffisamment rigide ou puissante. En effet, une machine peu rigide se déforme face aux efforts de formage : la rigidité de la machine influe ainsi directement sur la précision du formage.In addition some materials, such as those already mentioned, require significant efforts to be shaped. And these efforts may become blocking when the machine is not sufficiently rigid or powerful. In fact, an inflexible machine deforms in the face of forming forces: the rigidity of the machine thus directly affects the precision of the forming.

EXPOSÉ DE L'INVENTIONSTATEMENT OF THE INVENTION

L'invention vise à palier ces inconvénients en proposant d'élever la température de la tôle lors du formage incrémental et selon une configuration particulière.The invention aims to overcome these disadvantages by proposing to raise the temperature of the sheet during the incremental forming and in a particular configuration.

Plus précisément, l'invention a pour objet un procédé de formage incrémental de tôle selon une configuration dépourvue de matrice porteuse (de type « dieless » ou « partial die »), dans lequel, après une montée en température, une chauffe est effectuée sous la tôle à former et maintenue sensiblement constante en température pendant la durée du formage incrémental.More specifically, the subject of the invention is a method of incrementally forming sheet metal in a configuration devoid of a carrier matrix (of the "dieless" or "partial die" type), in which, after a rise in temperature, a heating is carried out under the sheet to be formed and kept substantially constant in temperature during the duration of the incremental forming.

Un tel formage incrémental à chaud favorise la formabilité de la tôle en diminuant les efforts nécessaires au formage et le retour élastique provoqué par le formage. Les possibilités de formage incrémental de pièces complexes et la précision des pièces formées en est ainsi sensiblement améliorée.Such hot incremental forming promotes the formability of the sheet by reducing the forces required for forming and elastic return caused by forming. The possibilities of incremental forming of complex parts and the precision of the formed parts are thus significantly improved.

Dans des formes de mise en oeuvre particulières, la température du chauffage peut s'élever à différents niveaux de température suivant le matériau à former, par exemple entre 600 et 800°C pour des alliages de titane.In particular embodiments, the temperature of the heating can be raised to different temperature levels depending on the material to be formed, for example between 600 and 800 ° C for titanium alloys.

L'invention se rapporte également à un dispositif de formage à chaud particulièrement adapté pour ce procédé. Ce dispositif comporte un châssis comprenant des moyens de positionnement de la tôle à former, ainsi qu'un caisson isolant disposé dans le châssis et agencé pour isoler thermiquement des moyens de chauffe, en particulier des lampes à halogène ou infrarouge ou équivalent. Ces moyens de chauffe sont disposés dans le caisson de sorte à pouvoir chauffer la tôle par sa face inférieure tournée vers l'intérieur du châssis.The invention also relates to a hot forming device particularly suitable for this process. This device comprises a frame comprising means for positioning the sheet to be formed, and an insulating box disposed in the frame and arranged to thermally isolate heating means, in particular halogen or infrared lamps or equivalent. These heating means are arranged in the box so as to be able to heat the sheet by its lower face turned towards the inside of the frame.

Selon des modes de réalisation particuliers :

  • les moyens de positionnement comportent un serre-flan et une matrice périphérique ou un support non spécifique aptes à enserrer la tôle à former ;
  • un système de chauffe auxiliaire, agencé en utilisation de préférence sous la matrice périphérique ou le support, permet de compenser les pertes thermiques liées à la fixation et au maintien de la tôle à travers le serre-flan et la matrice périphérique ;
  • le système de chauffe auxiliaire est constitué d'éléments chauffants résistifs.
According to particular embodiments:
  • the positioning means comprise a blank holder and a peripheral matrix or a non-specific support capable of clamping the sheet to be formed;
  • an auxiliary heating system, arranged in use preferably under the peripheral matrix or the support, makes it possible to compensate the thermal losses associated with the fixing and the maintenance of the sheet through the blank holder and the peripheral matrix;
  • the auxiliary heating system consists of resistive heating elements.

BRÈVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

D'autres avantages, aspects et caractéristiques de l'invention apparaîtront à la lecture de la description détaillée qui suit, en référence aux figures jointes qui représentent, respectivement :

  • en figure 1, un schéma de principe de formage incrémental sans matrice support ;
  • en figure 2, le diagramme de la variation des caractéristiques mécaniques d'une tôle à chaud et à froid, et
  • en figure 3, une vue en coupe d'un exemple d'appareil de formage incrémental à chaud selon l'invention.
Other advantages, aspects and characteristics of the invention will appear on reading the detailed description which follows, with reference to the appended figures which represent, respectively:
  • in figure 1 , an incremental forming principle diagram without a support matrix;
  • in figure 2 , the diagram of the variation of the mechanical characteristics of a sheet with hot and cold, and
  • in figure 3 , a sectional view of an example of an incremental hot forming apparatus according to the invention.

DESCRIPTION DÉTAILLÉEDETAILED DESCRIPTION

La figure 1 illustre le principe du formage incrémental sans outillage, c'est-à-dire sans matrice support de tôle. Dans un tel formage, un outil de formage 1 - ici un outil de type 3 axes - se déplace selon une trajectoire T sur la tôle 2 à former, initialement plane. L'outil est guidé par une machine, un robot R dans l'exemple, et sa trajectoire est paramétrée par une unité de traitement numérique 3 du robot. La tôle 2 est reliée au bâti par la liaison 10The figure 1 illustrates the principle of incremental forming without tools, that is to say without a sheet metal support matrix. In such forming, a tool of forming 1 - here a tool of 3-axis type - moves along a path T on the sheet 2 to be formed, initially flat. The tool is guided by a machine, a robot R in the example, and its trajectory is parameterized by a digital processing unit 3 of the robot. The sheet 2 is connected to the frame by the link 10

L'outil 1 déforme la tôle 2 selon des zones Z1, Z2, .., Zi, parallèlement à la trajectoire T. L'outil passe d'une zone Zi à une autre par un pas d'incrément « I » de déplacement perpendiculaire au plan de la tôle 2. L'amplitude de l'incrément est également réglée par l'unité 3.The tool 1 deforms the sheet 2 according to zones Z1, Z2,..., Zi, parallel to the trajectory T. The tool passes from one zone Zi to another by a step of increment "I" of perpendicular displacement in the plane of the plate 2. The amplitude of the increment is also set by the unit 3.

L'invention exploite l'abaissement des caractéristiques mécaniques d'une tôle lorsque l'on passe d'un domaine de déformation à froid D1 à un domaine de déformation à chaud D2, tel qu'illustré par la figure 2 pour une tôle en alliage de titane. Dans le domaine de déformation à froid D1, lorsque l'allongement « A » d'une éprouvette test sous contrainte « C » augmente, la courbe de variation à froid C1 passe d'une variation linéaire C10, correspondant à un domaine de déformation élastique, à une variation non linéaire C11 définissant un domaine de déformation plastique.The invention exploits the lowering of the mechanical characteristics of a sheet when passing from a cold deformation domain D1 to a heat deformation field D2, as illustrated by FIG. figure 2 for a titanium alloy sheet. In the cold deformation domain D1, when the elongation "A" of a stress test specimen "C" increases, the cold variation curve C1 passes from a linear variation C10, corresponding to a field of elastic strain to a nonlinear variation C11 defining a plastic strain domain.

La valeur de la contrainte au point Re1, correspondant au passage entre les domaines élastique et plastique, définit la limite d'élasticité de l'éprouvette. La courbe de déformation plastique C11 passe par un maximum Rm1, correspondant à la résistance mécanique à la rupture.The value of the stress at the point R e1 , corresponding to the transition between the elastic and plastic domains, defines the elastic limit of the specimen. The plastic strain curve C11 passes through a maximum R m1 , corresponding to the mechanical strength at break.

De manière similaire, dans le domaine de déformation à chaud D2, la courbe de variation C2 passe d'une variation linéaire C20 à une variation non linéaire C21, au point Re2 de changement de domaine. La courbe de variation non linéaire C21 passe par un maximum définissant le point Rm2 de résistance mécanique à la rupture.Similarly, in the hot deformation domain D2, the variation curve C2 changes from a linear variation C20 to a nonlinear variation C21, at the point R e2 of change of domain. The nonlinear variation curve C21 passes through a maximum defining the point Rm2 of mechanical strength at break.

Lorsque l'on passe du domaine de déformation à froid D1 à un domaine de déformation à chaud D2, les caractéristiques mécaniques Re1 et Rm1 sont sensiblement abaissées et les allongements correspondants Ae1 et Am1 sont sensiblement augmentées. Ainsi, des tôles en acier inoxydable ou en alliage de titane ou autre, difficiles à mettre en forme par formage incrémental à froid - du fait d'une ductilité limitée et d'un important retour élastique - peuvent alors être mis en forme par un chauffage particulier, sans nécessiter d'appareil ou d'outil de formage de haute rigidité.When passing from the cold deformation domain D1 to a heat deformation domain D2, the mechanical characteristics R e1 and R m1 are substantially lowered and the corresponding elongations A e1 and A m1 are substantially increased. Thus, sheets of stainless steel or titanium alloy or other, difficult to form by incremental cold forming - because of limited ductility and a large springback - can then be shaped by a particular heating, without requiring apparatus or forming tool of high rigidity.

La figure 3 illustre un exemple d'appareil de formage incrémental à chaud selon l'invention. L'appareil 100 comporte un châssis 110 doublé intérieurement d'un caisson isolant thermique 120. Ce caisson est de forme parallélépipédique et comporte cinq parois, dont une paroi de base 121 et des parois latérales 122, 123 et 124 (seules trois faces latérales sont visibles sur la vue en coupe de la figure 3). Il est ouvert sur sa partie supérieure, telle que représentée sur la figure, située en regard de la tôle 2 à former.The figure 3 illustrates an example of an incremental hot forming apparatus according to the invention. The apparatus 100 comprises a frame 110 lined internally with a thermal insulating box 120. This box is of parallelepipedal shape and comprises five walls, including a base wall 121 and side walls 122, 123 and 124 (only three lateral faces are visible on the sectional view of the figure 3 ). It is open on its upper part, as shown in the figure, located opposite the sheet 2 to be formed.

Le châssis 100 comporte également des moyens de positionnement 112 de la tôle 2 sous forme d'un serre-flan 114 et d'une matrice périphérique 116. La tôle 2 est ainsi positionnée du côté opposé à la face de base 121 du caisson 120.The frame 100 also comprises positioning means 112 of the sheet 2 in the form of a blank holder 114 and a peripheral matrix 116. The sheet 2 is thus positioned on the opposite side to the base face 121 of the box 120.

Le caisson 120 accueille sur sa paroi de base 121 des moyens de chauffe à lampes à halogène dans l'exemple 130. Ces lampes sont aptes à chauffer la tôle 2 par en dessous (flèches F).The casing 120 accommodates, on its base wall 121, halogen lamp heating means in the example 130. These lamps are able to heat the sheet 2 from below (arrows F).

Un système de chauffe auxiliaire 140, constitué d'éléments chauffants résistifs dans l'exemple, est agencé dans un support 142 sous la matrice périphérique 116. Ce système de chauffe 140 permet de compenser les pertes thermiques liées à la fixation et au maintien de la tôle 2 à travers le serre-joint 114 et la matrice 116. Ce système auxiliaire 140 permet également d'améliorer l'homogénéité en température sur toute la tôle à former 2.An auxiliary heating system 140, consisting of resistive heating elements in the example, is arranged in a support 142 under the peripheral matrix 116. This heating system 140 makes it possible to compensate for the thermal losses associated with the fixing and maintenance of the heating element. sheet 2 through the clamp 114 and the matrix 116. This auxiliary system 140 also improves the temperature homogeneity of the entire sheet to form 2.

En fonctionnement, les lampes 130 chauffent en direction de la face inférieure 2i de la tôle 2 tournée vers l'intérieur du châssis 110. la tôle est ici constituée d'un alliage en titane et d'aluminium, connu sous la dénomination commerciale « TA6V ». La température à atteindre est d'au moins 600°C. Une fois cette température atteinte, la chauffe est maintenue sensiblement constante sous la tôle 2 à former, en même temps que le formage incrémental est réalisé à partir de la face supérieure 2s de la tôle avec l'outil 1. La tôle 2 une fois formée présente schématiquement la forme globalement incurvée référencée 2f sur la figure 3.In operation, the lamps 130 are heated in the direction of the lower face 2i of the sheet 2 turned towards the inside of the frame 110. Here the sheet is made of a titanium and aluminum alloy, known under the trade name "TA6V ". The temperature to reach is at least 600 ° C. Once this temperature is reached, the heating is kept substantially constant under the sheet 2 to be formed, at the same time as the incremental forming is made from the upper face 2s of the sheet with the tool 1. The sheet 2 once formed schematically shows the generally curved shape referenced 2f on the figure 3 .

l'invention n'est pas limitée aux exemples décrits ou représentés ci-dessus. Il est par exemple possible d'utiliser des formes de châssis et de caisson cylindriques ou autres. Les moyens de positionnement de la tôle peuvent être de tout type connu de la personne du métier (serre-joint, clavette, etc.). Le système de chauffe auxiliaire peut être constitué de tout moyen approprié, par exemple un chauffage à induction ou équivalent.the invention is not limited to the examples described or represented above. For example, it is possible to use chassis shapes and cylindrical caissons or others. The positioning means of the sheet may be of any type known to those skilled in the art (clamp, key, etc.). The auxiliary heating system may consist of any suitable means, for example an induction heater or the like.

Claims (7)

Procédé de formage incrémental de tôle (2) en configuration dépourvue de matrice porteuse, caractérisé en ce que, après une montée en température, une chauffe (F) est effectuée sous la tôle à former (2) et maintenue sensiblement constante en température pendant la durée du formage incrémental.Process for incrementally forming sheet metal (2) in a configuration devoid of a carrier matrix, characterized in that , after a rise in temperature, a heating (F) is carried out under the sheet to be formed (2) and maintained substantially constant in temperature during the duration of incremental forming. Dispositif de formage incrémental à chaud pour la mise en oeuvre du procédé selon la revendication 1, caractérisé en ce qu'il comporte un châssis (110) comprenant des moyens de positionnement (112) de la tôle à former (2), ainsi qu'un caisson isolant (120) disposé dans le châssis (110) et agencé pour isoler thermiquement des moyens de chauffe (130), ces moyens de chauffe étant disposés dans le caisson (120) de sorte à pouvoir chauffer (F) la tôle (2) par sa face inférieure (2i) tournée vers l'intérieur du châssis (110).Hot incremental forming device for carrying out the method according to claim 1, characterized in that it comprises a frame (110) comprising positioning means (112) for forming the sheet (2), as well as an insulating box (120) disposed in the frame (110) and arranged to thermally isolate heating means (130), these heating means being arranged in the box (120) so as to be able to heat (F) the sheet (2 ) by its lower face (2i) turned towards the inside of the chassis (110). Dispositif de formage incrémental à chaud selon la revendication précédente, dans lequel les moyens de chauffe comportent des lampes à halogène (130).Hot incremental forming device according to the preceding claim, wherein the heating means comprise halogen lamps (130). Dispositif de formage incrémental à chaud selon l'un des revendications 2 ou 3, dans lequel les moyens de positionnement (112) comportent un serre-flan (114) et une matrice périphérique (116) aptes à enserrer la tôle à former (2).Hot incremental forming device according to one of claims 2 or 3, wherein the positioning means (112) comprise a blank holder (114) and a peripheral matrix (116) capable of clamping the sheet to be formed (2). . Dispositif de formage incrémental à chaud selon l'une quelconque des revendications 2 à 4, dans lequel un système de chauffe auxiliaire (140) permet de compenser les pertes thermiques liées à la fixation et au maintien de la tôle (2) à travers le serre-flan (114) et la matrice (116).Hot incremental forming device according to any one of claims 2 to 4, wherein an auxiliary heating system (140) compensates for thermal losses associated with the attachment and maintenance of the sheet (2) through the greenhouse -flan (114) and the matrix (116). Dispositif de formage incrémental à chaud selon la revendication précédente, dans lequel le système de chauffe auxiliaire (140) est agencé en utilisation sous la matrice périphérique (116).Hot incremental forming apparatus according to the preceding claim, wherein the auxiliary heating system (140) is arranged in use under the peripheral matrix (116). Dispositif de formage incrémental à chaud selon l'une des revendications 5 ou 6, dans lequel le système de chauffe auxiliaire (140) est constitué d'éléments chauffants résistifs.An incremental hot forming apparatus according to one of claims 5 or 6, wherein the auxiliary heating system (140) is made of resistive heating elements.
EP20120178446 2011-08-18 2012-07-30 Incremental forming device Active EP2559499B1 (en)

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CN113042618A (en) * 2021-03-15 2021-06-29 武汉理工大学 Incremental forming method for large-scale component

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CN104384310A (en) * 2014-09-24 2015-03-04 安徽工业大学 Incremental forming method with auxiliary base for plates
CN104384310B (en) * 2014-09-24 2016-04-27 安徽工业大学 A kind of plate progressive molding method with sub-mount
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CN110102637A (en) * 2019-06-13 2019-08-09 福州大学 A kind of single-point progressive molding hot air workbench and its application method
CN110102637B (en) * 2019-06-13 2023-12-08 福州大学 Single-point progressive forming hot air heating workbench and application method thereof
CN111774472A (en) * 2020-07-31 2020-10-16 重庆交通大学 Floating support single-point progressive hot forming device
CN113042618A (en) * 2021-03-15 2021-06-29 武汉理工大学 Incremental forming method for large-scale component

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