EP2001615A1 - Procédé et dispositif de pliage de pièces métalliques plates - Google Patents

Procédé et dispositif de pliage de pièces métalliques plates

Info

Publication number
EP2001615A1
EP2001615A1 EP07710531A EP07710531A EP2001615A1 EP 2001615 A1 EP2001615 A1 EP 2001615A1 EP 07710531 A EP07710531 A EP 07710531A EP 07710531 A EP07710531 A EP 07710531A EP 2001615 A1 EP2001615 A1 EP 2001615A1
Authority
EP
European Patent Office
Prior art keywords
bending
groove
pressure roller
die
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.)
Granted
Application number
EP07710531A
Other languages
German (de)
English (en)
Other versions
EP2001615B1 (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

Links

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, over edges along a bending line with a straight tool movement.
  • the forming takes place according to the invention by a) sinking a bending punch between the bending edges of a die b) holding the punch at the lowest point of the bend c) applying a compressive stress to superimpose the tensile stress in the forming zone d) incremental superimposition of the tensile stress in the forming zone by a compressive stress along the bending line of the workpiece to be bent.
  • the invention further relates to a device 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 are interchangeable and below the bending punch in the direction of the bending line ver slaughterbarer tool carriage are arranged with a directed against the workpiece to be bent and adjustable pressure roller.
  • 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 processes such as, for example, according to 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 base.
  • 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 enables 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. Also suitable for the new process bending device should be much simpler and more flexible.
  • the solution of these objects according to the invention consists essentially in the fact that the resulting from the bending process in the forming zone voltages with a compressive stress in locally and temporally successive steps. is incrementally superimposed. It is based on the idea that the maximum of the tensile stress is achieved in a deformation 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. By controlling this process, 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 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.
  • the starting point of the invention is the already mentioned free bending, in the gem.
  • a punch is pressed from above on a sheet.
  • 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 ⁇ ⁇ 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 be able to remove the bent workpiece after being relieved of load by the bending punch as a ready-to-use part.
  • the pressure roller can also have other shapes, 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 bring the sensor from the outside to the bending edges, if this is appropriate 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
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 true EP2001615A1 (fr) 2008-12-17
EP2001615B1 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)

Families Citing this family (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
WO2014139539A1 (fr) * 2013-03-15 2014-09-18 Syddansk Universitet Inhibiteur de dpysl3/crmp4 pour le traitement d'une perte osseuse
DE102017006218A1 (de) 2017-06-28 2019-01-03 Technische Universität Dortmund Vorrichtung und Verfahren zum Biegen von blechartigen Werkstücken bei gleichzeitiger Druckspannungsüberlagerung
EP3511085A1 (fr) * 2018-01-16 2019-07-17 Outokumpu Oyj Structure porteuse d'une voiture de tourisme formée par pliage
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

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
DE4042732B4 (de) * 1989-11-14 2004-09-16 Amada Co., Ltd., Isehara Verfahren zum Biegen eines Metallbleches und Biegemaschine mit einem Oberstempel und einer Matrize zum Biegen eines Metallbleches
US5099675A (en) * 1991-01-25 1992-03-31 Century Manufacturing Co., Inc. Punch and die assembly for bending operations

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007109819A1 *

Also Published As

Publication number Publication date
ATE453464T1 (de) 2010-01-15
WO2007109819A1 (fr) 2007-10-04
US20110036136A1 (en) 2011-02-17
DE502007002488D1 (de) 2010-02-11
EP2001615B1 (fr) 2009-12-30
DE102006014093A1 (de) 2007-09-27

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