EP2559499B1 - Vorrichtung zur inkrementellen Umformung - Google Patents

Vorrichtung zur inkrementellen Umformung Download PDF

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Publication number
EP2559499B1
EP2559499B1 EP20120178446 EP12178446A EP2559499B1 EP 2559499 B1 EP2559499 B1 EP 2559499B1 EP 20120178446 EP20120178446 EP 20120178446 EP 12178446 A EP12178446 A EP 12178446A EP 2559499 B1 EP2559499 B1 EP 2559499B1
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EP
European Patent Office
Prior art keywords
sheet
forming device
hot
incremental forming
forming
Prior art date
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Active
Application number
EP20120178446
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English (en)
French (fr)
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EP2559499A1 (de
Inventor
Bernard Duprieu
Nicolas Guegan
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 date
Application filed by Airbus Operations SAS filed Critical Airbus Operations SAS
Publication of EP2559499A1 publication Critical patent/EP2559499A1/de
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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 an incremental forming device hot sheet.
  • 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.
  • 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 object of the invention is a hot forming device according to claim 1.
  • 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 shown above but includes all the embodiments covered by the claims.
  • 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.

Landscapes

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

Claims (6)

  1. Vorrichtung zum inkrementalen Heißformen eines Bleches (2), dadurch gekennzeichnet, dass sie ein Gestell (110) besitzt, umfassend Mittel (112) zur Positionierung des zu formenden Bleches (2), sowie einen Isolierkasten (120), der in dem Gestell (110) angeordnet und derart vorgesehen ist, dass er Heizmittel (130) thermisch isoliert, wobei diese Heizmittel in dem Kasten (120) derart angeordnet sind, dass das Blech (2) mit seiner zum Inneren des Gestells (110) gewandten Unterseite (2i) erhitzt (F) werden kann.
  2. Vorrichtung zum inkrementalen Heißformen nach dem vorhergehenden Anspruch, bei der die Heizmittel Halogenlampen (130) umfassen.
  3. Vorrichtung zum inkrementalen Heißformen nach einem der Ansprüche 1 oder 2, bei der die Positionierungs-mittel (112) einen Blechhalter (114) und eine Umfangsmatrix (116) umfassen, die das zu formende Blech (2) halten können.
  4. Vorrichtung zum inkrementalen Heißformen nach einem der Ansprüche 1 bis 3, bei dem es ein Hilfsheizsystem (140) ermöglicht, die Wärmeverluste, die mit der Befestigung und dem Halten des Blechs (2) durch den Blechhalter (114) und die Matrix (116) zusammenhängen, auszugleichen.
  5. Vorrichtung zum inkrementalen Heißformen nach dem vorhergehenden Anspruch, bei der das Hilfsheizsystem (140) in Verwendung unter der Umfangsmatrix (116) angeordnet ist.
  6. Vorrichtung zum inkrementalen Heißformen nach einem der Ansprüche 4 oder 5, bei dem das Hilfsheizsystem (140) von Widerstandsheizelementen gebildet ist.
EP20120178446 2011-08-18 2012-07-30 Vorrichtung zur inkrementellen Umformung Active EP2559499B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1157403A FR2979066B1 (fr) 2011-08-18 2011-08-18 Procede et dispositif de formage incremental

Publications (2)

Publication Number Publication Date
EP2559499A1 EP2559499A1 (de) 2013-02-20
EP2559499B1 true EP2559499B1 (de) 2013-11-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120178446 Active EP2559499B1 (de) 2011-08-18 2012-07-30 Vorrichtung zur inkrementellen Umformung

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EP (1) EP2559499B1 (de)
FR (1) FR2979066B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20240039490A (ko) * 2022-09-19 2024-03-26 한국생산기술연구원 점진 성형 장치

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104384310B (zh) * 2014-09-24 2016-04-27 安徽工业大学 一种带辅助底座的板料渐进成形方法
US9719150B2 (en) * 2015-01-05 2017-08-01 The Boeing Company Methods of forming a workpiece made of a naturally aging alloy
CN106001254B (zh) * 2016-05-24 2017-12-26 北京航空航天大学 一种用于热渐进成形的保温装置
CN110102637B (zh) * 2019-06-13 2023-12-08 福州大学 一种单点渐进成形热空气加热工作台及其使用方法
CN111774472B (zh) * 2020-07-31 2022-02-11 重庆交通大学 浮动支撑单点渐进热成形装置
CN113042618A (zh) * 2021-03-15 2021-06-29 武汉理工大学 大型构件增量成形方法
CN113857342B (zh) * 2021-09-08 2023-05-12 上海交通大学 一种提高薄壁成形件搅拌摩擦渐进成形性能的方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3959455B2 (ja) * 2002-02-19 2007-08-15 本田技研工業株式会社 逐次成形装置
US7984635B2 (en) * 2005-04-22 2011-07-26 K.U. Leuven Research & Development Asymmetric incremental sheet forming system
JP5224259B2 (ja) * 2006-11-17 2013-07-03 新潟県 マグネシウム合金薄板の塑性加工方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20240039490A (ko) * 2022-09-19 2024-03-26 한국생산기술연구원 점진 성형 장치
KR102791769B1 (ko) 2022-09-19 2025-04-09 한국생산기술연구원 점진 성형 장치

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Publication number Publication date
EP2559499A1 (de) 2013-02-20
FR2979066B1 (fr) 2013-09-06
FR2979066A1 (fr) 2013-02-22

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