EP2001615B1 - Procédé et dispositif de pliage de pièces métalliques plates - Google Patents

Procédé et dispositif de pliage de pièces métalliques plates Download PDF

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Publication number
EP2001615B1
EP2001615B1 EP07710531A EP07710531A EP2001615B1 EP 2001615 B1 EP2001615 B1 EP 2001615B1 EP 07710531 A EP07710531 A EP 07710531A EP 07710531 A EP07710531 A EP 07710531A EP 2001615 B1 EP2001615 B1 EP 2001615B1
Authority
EP
European Patent Office
Prior art keywords
bending
pressure
die
sheet
punch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07710531A
Other languages
German (de)
English (en)
Other versions
EP2001615A1 (fr
Inventor
Matthias Kleiner
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.)
Trumpf Maschinen Austria GmbH and Co KG
Original Assignee
Trumpf Maschinen Austria GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Trumpf Maschinen Austria GmbH and Co KG filed Critical Trumpf Maschinen Austria GmbH and Co KG
Publication of EP2001615A1 publication Critical patent/EP2001615A1/fr
Application granted granted Critical
Publication of EP2001615B1 publication Critical patent/EP2001615B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor

Definitions

  • the invention relates to a method for bending flat metallic workpieces, in particular steel sheets, by free bending, also called bending or bending air, over edges along a bending line with straight tool movement, according to the preamble of claim 1 (see, eg US-A-3978706 ).
  • the invention further relates to a device according to the preamble of Anpruchs 5 for carrying out the method according to the preceding paragraph, consisting of a die with two parallel sets of dies for receiving the bending edges and a bending die arranged above the die, the die sets for setting different die widths interchangeable are and below the bending punch a ver slaughterbarer in the direction of the bending line tool carriage with a directed against the workpiece to be bent and adjustable pressure roller are arranged.
  • the present invention relates to the bending process standardized in DIN 8586 and in particular to the free bending of flat metallic workpieces.
  • known bending methods such as for example EP 0 341 211 A2
  • the bending of sheets takes place with the aid of a bending device which has a bending punch and a die with an adjustable bottom.
  • the bending punch penetrates depending on the desired bending angle up to a previously defined immersion depth with simultaneous pressing of the die bottom along the bending line.
  • the aforementioned methods are expensive to implement and do not allow universal applications on any workpiece shapes and bending angles. Therefore, a simple method was sought in which the bending angle can be set precisely and which allows reproducible values for the geometry of the bent workpiece with high accuracy.
  • the bending angle should be locally variable with respect to the sheet width and thus also the springback behavior be locally adjustable.
  • a suitable for the new process bending device should be much simpler and more flexible to use.
  • the solution of these objects consists according to the invention in a method according Anpruch 1.
  • the resulting from the bending process in the forming zone voltages are compressed with a compressive stress in locally and temporally successive steps. incrementally superimposed. This is based on the idea that the maximum of the tensile stress is achieved in a deforming zone displaced into the bending limbs, so that here too the stress superposition with the applied compressive stress must take place in this region of the deformation zone.
  • the local change of bending angle and springback behavior in the direction of the sheet metal parts is to be made possible.
  • the device according to the invention according to claim 5, therefore, provides a pressure roller, in particular a steel roller with a preferably V-shaped groove, annular groove or with an elastomer coating below the bending punch.
  • a pressure roller in particular a steel roller with a preferably V-shaped groove, annular groove or with an elastomer coating below the bending punch.
  • a bending punch is pressed onto a metal sheet from above.
  • the sheet lies horizontally on a die equipped with two parallel die sets for the bending edges. If the bending punch now dips into the die with its stamp tip, the sheet is bent down into the die, whereby it is laterally supported on the die edge radii. This creates compressive stresses on the inside of the sheet in the region of the forming zone, while tensile stresses prevail on the outside of the sheet in the region of the forming zone.
  • the sheet metal now has a bending angle ⁇ 1 in the loaded state. It consists of the lateral bending lugs, which run on the lower punch bending edge.
  • the compressive stress is effected with the groove surface which presses laterally from the outside against the radius range.
  • a compensation of the tensile stress is effected in the forming zone, which is sufficient to remove the bent workpiece after being relieved by the punch as a ready-to-use part.
  • the pressure roller can also have other shapes (see FIGS. 2a to 2c ), such as the one Combination of a ring and V-groove or be provided with a spherical surface such as a ton. It is also possible to provide the pressure roller with an elastomer coating.
  • a bending angle sensor is sunk between the bending edges. Then, the delivery of the pressure roller in dependence on the measurement of the sensor signal but also by the pressure to be set pressure controlled. However, it is also possible to reduce the sensor from the outside to the bending edges, if this is expedient taking into account the local conditions.
  • the geometry of the V-groove is dimensioned so that the forming zone is reached in the bending legs. It is important that contact between the surface in the region of the groove and the bent part also prevails outside the radius range.
  • the groove width should preferably be greater than twice the bending radius or the bow shape of the punch, so that in a V-shape as large a contact surface with the pressure roller along the bending line is achieved.
  • the method according to the invention can be carried out with alternating pressure application. This is of great advantage, above all, for sheets with different material properties or sheet thicknesses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Claims (12)

  1. Procédé de pliage de pièces métalliques plates (b), en particulier de tôles d'acier, par pliage libre sur des arêtes le long d'une ligne de pliage avec mouvement d'outil rectiligne, où les arêtes de pliage sont disposées parallèlement à la direction longitudinale de la tôle et le mouvement d'outil a lieu le long de la largeur de la tôle, avec les étapes suivantes:
    a) insertion d'un poinçon (a) entre les arêtes de pliage d'une matrice
    b) retenue du poinçon à la position la plus basse du pliage
    c) application d'une contrainte de compression pour la compensation des contraintes dans la zone de déformation produite par le pliage, caractérisé par l'étape suivante,
    d) superposition incrémentielle, c'est-à-dire par des étapes qui se suivent localement et dans le temps, de la contrainte de traction par une contrainte de compression, qui a lieu le long de la ligne de pliage dans la direction de la largeur de la tôle de l'outil plié (b), où l'outil (b) produisant la contrainte de compression est déplacé le long de la ligne de pliage dans la direction de la largeur de la tôle.
  2. Procédé selon la revendication 1, caractérisé en ce que la superposition de la contrainte de traction dans la zone de déformation a lieu par une contrainte de compression produite de manière incrémentielle entre l'arête de pliage et la ligne de pliage, et qu'il est produit un effet varié sur l'angle de pliage localement sur la largeur de la tôle.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que la superposition incrémentielle de la contrainte de traction a lieu par une contrainte de compression avec une compression de face qui se situe dans la zone élastique également en dessous de la limite de contrainte d'écoulement Rp0,2 du matériau respectif.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la contrainte de compression est produite d'une manière incrémentielle avec une pointe de contrainte augmentant et diminuant dans la zone de la contrainte de traction maximale entre l'arête de pliage et la ligne de pliage.
  5. Dispositif de pliage pour l'exécution du procédé selon la revendication 1, constitué d'une matrice (c) avec deux jeux de matrice parallèles et un poinçon de pliage (a) disposé au-dessus des jeux de matrice qui peut être introduit dans l'espace intermédiaire entre les arêtes de pliage, caractérisé en ce qu'il est disposé entre les jeux de matrice en dessous du poinçon (a) un chariot déplaçable dans la direction de l'axe de pliage, donc dans la largeur de la tôle, avec un rouleau d'application (d) agissant dans l'axe de poinçon, qui présente une rainure dans le plan de coupe avec l'axe de poinçon.
  6. Dispositif de pliage selon la revendication 5, caractérisé en ce qu'un capteur d'angle de pliage (e) peut être introduit à une distance en amont du rouleau d'application (d) entre les arêtes de pliage, et que le rapprochement du rouleau d'application (d) a lieu en fonction de la mesure du signal du capteur.
  7. Dispositif de pliage selon la revendication 6, caractérisé en ce que la rainure présente une forme en V, un rayon.
  8. Dispositif de pliage selon l'une des revendications précédentes, caractérisé en ce que la matrice (c) présente des jeux de matrice échangeables et tournables, et en ce que des largeurs de matrice différentes peuvent ainsi être réglées.
  9. Dispositif de pliage selon l'une des revendications précédentes, caractérisé en ce que l'application des contraintes de compression a lieu de manière incrémentielle à l'aide du rouleau d'application (d) le long de la ligne de pliage.
  10. Dispositif de pliage selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu un réglage de la vitesse d'avancement pour le déplacement du rouleau d'application (d) le long de la ligne de pliage de la pièce pliée (b).
  11. Dispositif de pliage selon l'une des revendications 7 à 10, caractérisé en ce que la profondeur de la rainure en V dans le rouleau d'application (d) est dimensionné de façon que la face de contact de la rainure en V sélectionnée s'étend avec la paroi extérieure de la tôle (b) dans la zone de traction de la zone de déformation de la tôle.
  12. Dispositif de pliage selon la revendication précédente, caractérisé en ce que la largeur de la rainure en V est adaptée au rayon de pliage de la tôle (b) pour obtenir une grande face de contact, sur toute la largeur de la zone de déformation, avec le rouleau d'application (d).
EP07710531A 2006-03-24 2007-03-23 Procédé et dispositif de pliage de pièces métalliques plates Not-in-force EP2001615B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006014093A DE102006014093A1 (de) 2006-03-24 2006-03-24 Verfahren und Biegevorrichtung zum Biegen von flächigen metallischen Werkstücken
PCT/AT2007/000142 WO2007109819A1 (fr) 2006-03-24 2007-03-23 Procédé et dispositif de pliage de pièces métalliques plates

Publications (2)

Publication Number Publication Date
EP2001615A1 EP2001615A1 (fr) 2008-12-17
EP2001615B1 true EP2001615B1 (fr) 2009-12-30

Family

ID=38283491

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07710531A Not-in-force EP2001615B1 (fr) 2006-03-24 2007-03-23 Procédé et dispositif de pliage de pièces métalliques plates

Country Status (5)

Country Link
US (1) US20110036136A1 (fr)
EP (1) EP2001615B1 (fr)
AT (1) ATE453464T1 (fr)
DE (2) DE102006014093A1 (fr)
WO (1) WO2007109819A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102151723A (zh) * 2011-05-24 2011-08-17 浙江通达钢模有限公司 一种钢板端部圆弧成型装置
DE102017006218A1 (de) 2017-06-28 2019-01-03 Technische Universität Dortmund Vorrichtung und Verfahren zum Biegen von blechartigen Werkstücken bei gleichzeitiger Druckspannungsüberlagerung
CN111580464A (zh) * 2020-05-20 2020-08-25 南京航空航天大学 多辊自由弯曲的三维恒定曲率构件的成形轨迹解析方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014139539A1 (fr) * 2013-03-15 2014-09-18 Syddansk Universitet Inhibiteur de dpysl3/crmp4 pour le traitement d'une perte osseuse
EP3511085A1 (fr) * 2018-01-16 2019-07-17 Outokumpu Oyj Structure porteuse d'une voiture de tourisme formée par pliage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978706A (en) * 1974-12-24 1976-09-07 Nippon Kokan Kabushiki Kaisha Precision bending work method for metallic materials
AT389829B (de) * 1988-05-03 1990-02-12 Haemmerle Ag Verfahren zum biegen von blechstuecken mit hilfe einer biegeeinrichtung
JPH072088Y2 (ja) * 1988-11-15 1995-01-25 株式会社小松製作所 曲げ機械の工具位置制御装置
DE4042733C2 (de) * 1989-11-14 2003-04-17 Amada Co Vorrichtung zur Erfassung eines Biegewinkels
US5099675A (en) * 1991-01-25 1992-03-31 Century Manufacturing Co., Inc. Punch and die assembly for bending operations

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102151723A (zh) * 2011-05-24 2011-08-17 浙江通达钢模有限公司 一种钢板端部圆弧成型装置
DE102017006218A1 (de) 2017-06-28 2019-01-03 Technische Universität Dortmund Vorrichtung und Verfahren zum Biegen von blechartigen Werkstücken bei gleichzeitiger Druckspannungsüberlagerung
EP3424606A1 (fr) 2017-06-28 2019-01-09 Technische Universität Dortmund Dispositif et procédé de pliage des pièces à usiner en forme de tôle à superposition de contrainte de compression simultanée
CN111580464A (zh) * 2020-05-20 2020-08-25 南京航空航天大学 多辊自由弯曲的三维恒定曲率构件的成形轨迹解析方法
CN111580464B (zh) * 2020-05-20 2021-06-29 南京航空航天大学 多辊自由弯曲的三维恒定曲率构件的成形轨迹解析方法

Also Published As

Publication number Publication date
ATE453464T1 (de) 2010-01-15
US20110036136A1 (en) 2011-02-17
WO2007109819A1 (fr) 2007-10-04
DE102006014093A1 (de) 2007-09-27
EP2001615A1 (fr) 2008-12-17
DE502007002488D1 (de) 2010-02-11

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