EP1413368A1 - Presse plieuse - Google Patents

Presse plieuse Download PDF

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Publication number
EP1413368A1
EP1413368A1 EP20030103869 EP03103869A EP1413368A1 EP 1413368 A1 EP1413368 A1 EP 1413368A1 EP 20030103869 EP20030103869 EP 20030103869 EP 03103869 A EP03103869 A EP 03103869A EP 1413368 A1 EP1413368 A1 EP 1413368A1
Authority
EP
European Patent Office
Prior art keywords
clamping plate
folding tools
press brake
tools
pivot axis
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
EP20030103869
Other languages
German (de)
English (en)
Other versions
EP1413368B1 (fr
Inventor
Cornelis Hendricus Liet
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.)
Nivora IP BV
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1413368A1 publication Critical patent/EP1413368A1/fr
Application granted granted Critical
Publication of EP1413368B1 publication Critical patent/EP1413368B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D5/0236—Tool clamping
    • 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 press brake comprising folding tools that can be fitted in a movable beam by means of a receiving and clamping arrangement, which receiving and clamping arrangement consists at least of recesses formed in said beam for accommodating the folding tools, a clamping plate being pivotable about a pivot axis, which clamping plate has an end intended to engage the tools present in said recesses, and a driving arrangement engaging said clamping plate, which functions to cause the clamping plate to pivot about its pivot axis.
  • the driving arrangement engages the clamping plate at a point located between the pivot axis and the aforesaid end of the clamping plate engaging the folding tools.
  • clamping tools are only present in one half (seen crosswise) of the clamping plate, the folding tools located nearest the centre of the clamping plate will be engaged with the greatest force by the clamping plate, whilst the clamping tools present at locations increasingly further away from said centre of the clamping plate will be engaged with decreasing force (or not al all) by the clamping plate. It stands to reason that such a situation is undesirable, since at least some of the tools may move or even become detached during operation of the press brake in that case, which will have an adverse effect on the accuracy of the folding operation.
  • the invention provides a press brake comprising folding tools that can be fitted in a movable beam by means of a receiving and clamping arrangement, which receiving and clamping arrangement consists at least of recesses formed in said beam for accommodating the folding tools, a clamping plate being pivotable about a pivot axis, which clamping plate has an end intended to engage the tools present in said recesses, and a driving arrangement engaging said clamping plate, which functions to cause the clamping plate to pivot about its pivot axis, characterized in that the end of the clamping plate that engages the folding tools and the point of engagement of the driving arrangement are located on opposite sides of the pivot axis.
  • the present invention is based on the perception that the aforesaid undesirable deformation (torsion) of the clamping plate at the location of the end engaging the folding tools can be reduced by decreasing the distance between said end and the pivot axis of the clamping plate. While it is difficult to realise such a decrease when using the press brake that is known from the prior art, as sufficient space must be available in said prior art press brake between said pivot axis and said end in order to enable the driving arrangement to engage the clamping plate, the press brake according to the invention is designed to enable the driving arrangement to engage the clamping plate at a point located on a side of the pivot axis opposite the side where the aforesaid engaging end is located.
  • said engaging end of the clamping plate comprises a number of resilient lips arranged side by side.
  • said end comprises resilient lips, said lips can easily compensate for said - already minimised - deformation, by resiliently deforming to a greater or lesser extent. In this way it is ensured at all times that each folding tool is engaged.
  • a simple way of realising such resilient lips is provided by an embodiment of the press brake in which said end is provided with a number of spaced-apart cuts extending perpendicularly to the relevant edge of the clamping plate.
  • This strip of material defined between two adjacent cuts thus forms a lip. It is possible, of course, to define a desired resilience of the lips by suitably selecting the material at the location of said lips and suitably selecting the shape of said lips.
  • said end of the clamping plate is bevelled on the side that faces towards the folding tools, it will be easier to fit the folding tools in the recesses in the beam, beside the clamping plate, since the bevel forms an entrance guide, as it were, for the ends of the folding tools.
  • a housing is mounted on the beam for accommodating at least part of the driving arrangement, which housing comprises a shoulder extending parallel to the longitudinal direction of the beam, and thus of the folding tools, which shoulder forms the pivot axis.
  • a pivot axis extends over the entire width of the clamping plate, so that, in combination with the minimised distance between said pivot axis and said engaging end of the clamping plate, the extent of deformation of the clamping plate under the influence of an asymmetric load can be minimised.
  • the clamping plate will generally comprise, in a manner, which is known per se, a (counter) shoulder mating with the aforesaid shoulder. In this way the position of the clamping plate and the housing relative to each other is fixed in a reliable manner, whilst pivoting of the clamping plate and the housing with respect to each other will nevertheless be possible.
  • the driving arrangement consists of a number of spring members arranged side by side, which spring members load the clamping plate to a pivoted position in which it engages the folding tools, and a driving unit, e.g. a cylinder-piston assembly, for pivoting the clamping plate against the spring force of the spring members to a pivoted position in which the folding tools are released.
  • the spring members may be compression springs accommodated in the beam, for example, whilst the driving unit is accommodated in a housing connected to the beam in that case.
  • the driving unit e.g. the cylinder-piston assembly, only needs to be activated when the folding tools are to be exchanged, removed or the like.
  • the advantage of this embodiment is the fact that a malfunction of the driving unit will not result in the folding tools unintentionally becoming detached.
  • the driving arrangement consists of a number of spring members arranged side by side, which spring members load the clamping plate to a pivoted position for releasing the folding tools, and a driving unit, e.g. a cylinder-piston assembly, for pivoting the clamping plate against the spring force of the spring members to a pivoted position in which the clamping plate engages the folding tools.
  • the spring members function to maintain the clamping plate in an inactive pivoted position, so that less powerful spring members may be used.
  • the folding tools are now kept immobile as a result of the driving unit being activated.
  • Fig. 1 is a schematic cross-sectional view of a part of the press brake according to the invention.
  • Fig. 2 is a schematic front view of a clamping plate used in the press brake according to the invention.
  • the press brake according to the invention comprises a movable beam 1, as is already known per se, in which recesses 2 for receiving folding tools 3 are formed.
  • the folding tools 3 can be used for folding sheet material, such as a metal sheet.
  • the movable beam 1 of a press brake of the present type is usually an upper beam of the press brake, said beam 1 may also be a lower beam.
  • the beam 1 may be stationary rather than movable, and arrangements may be provided for moving the sheet material with respect to the folding tools 3. This does not influence the movement of the folding tools 3 and the sheet material to be worked relative to each other, however.
  • the folding tools 3 are detachably fitted in the beam 1. After all, it must be possible to adjust the folding tools 3 with respect to the beam 1 (in a direction perpendicular to the plane of the drawing), to move the folding tools 3 at least partially or to exchange at least some of the folding tools for other folding tools.
  • a receiving and clamping arrangement which, as far as the most essential parts thereof are concerned, comprises a pivotable clamping plate 4 and a driving arrangement, which engages the clamping plate 4, in addition to the recesses 2, which driving arrangement in this case consists of compression springs 5 and a driving unit 6.
  • the clamping plate 4 has an end 7 intended for engaging the folding tools 3 that are accommodated in the recesses 2. Said end 7 is thereto provided with a nose 8, which can mate with a corresponding cutout 9 in the folding tools 3.
  • the clamping plate 4 has a shoulder 10 at a point some distance away from the aforesaid end 7, which shoulder rests on a shoulder 11 of a housing 12 mounted to the beam 1.
  • a pivot axis for the clamping plate 4 is formed at that location, which pivot axis extends over the entire width of the clamping plate 4, perpendicularly to the plane of drawing in Fig. 1.
  • the compression springs 5, a number of which are arranged side by side perpendicularly to the plane of drawing, load the clamping plate 4 to a pivoted position (as shown), in which the nose 8 engages in the cut-out 9 of the folding tools, so that the folding tools 3 are pressed firmly into the recesses 2 and upwards against the beam 1.
  • the driving unit 6 e.g. a cylinder-piston assembly
  • the clamping plate 4 can be pivoted against the force exerted by the compression springs 5 to a position (not shown) in which the clamping nose 8 releases the recesses 9, and the folding tools 3 can be removed in downward direction, seen in Fig. 1, from the beam 1.
  • Placement of the driving unit 5,6 on the side of the pivot axis (defined by the shoulders 10 and 11) remote from the end 7 makes it possible to minimise the distance between said pivot axis and the end 7.
  • Such a minimisation will also lead to a minimisation of the extent of torsion of the clamping plate 4, in particular at the end 7 (e.g. in the case of an asymmetric loading). In this way it is ensured that all folding tools will be effectively engaged, even when the clamping plate 4 is loaded asymmetrically.
  • Fig. 2 shows a front view of a clamping plate 4 that may be used in the press brake that is shown in Fig. 1.
  • a dotted line 16 indicates the location of the pivot axis (defined by the mating shoulders 10 and 11 of the clamping plate 4 and the housing 12, respectively).
  • the dotted circles 5' schematically represent the location at which two (in this case) compression springs 5 engage the clamping plate 4.
  • the dotted circle 6' similarly indicates the location at which a driving unit 6, such as a cylinder-piston assembly, engages the clamping plate 4 (in a direction opposite to the direction of pressure of the compression springs 5).
  • a driving unit 6 such as a cylinder-piston assembly
  • the press brake may be provided with a safety arrangement to prevent the folding tools 3 from falling out of the beam 1 in the inoperative position of the clamping plate 4 already.
  • a safety arrangement may e.g. consist of a projection formed on the folding tools 3, which mates with a movable projection that is connected to the beam 1 or to the housing 12.
  • Fig. 1 furthermore shows that the clamping plate 4 is provided with a bevelled portion 17 near the end 7. This provides a smooth entry of the folding tools 3 into the recesses 2 of the beam 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP20030103869 2002-10-21 2003-10-20 Presse plieuse Expired - Lifetime EP1413368B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1021707A NL1021707C2 (nl) 2002-10-21 2002-10-21 Kantpers.
NL1021707 2002-10-21

Publications (2)

Publication Number Publication Date
EP1413368A1 true EP1413368A1 (fr) 2004-04-28
EP1413368B1 EP1413368B1 (fr) 2012-08-29

Family

ID=32065074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030103869 Expired - Lifetime EP1413368B1 (fr) 2002-10-21 2003-10-20 Presse plieuse

Country Status (2)

Country Link
EP (1) EP1413368B1 (fr)
NL (1) NL1021707C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1037464A (nl) * 2008-11-11 2010-05-12 Wila Bv Inrichting voor het inspannen van een gereedschap.
ITPC20130024A1 (it) * 2013-09-13 2015-03-14 Rolleri S P A Dispositivo per il bloccaggio di utensili in una pressa piegatrice

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106881404A (zh) * 2017-04-25 2017-06-23 上海葛世工业自动化有限公司 夹块装置及折弯机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2339485A1 (fr) * 1976-01-27 1977-08-26 Colly Pierre Moyen de fixation amovible pour porte-outil de presse-plieuse et similaire
DE3524694A1 (de) * 1985-07-11 1987-01-22 Hilma Gmbh Maschf Spannvorrichtung fuer oberwerkzeuge in abkantpressen
US5022256A (en) * 1988-09-29 1991-06-11 Machinefabriek Wila B.V. Clamping device
DE19513576A1 (de) 1995-04-19 1996-10-31 Guenzburger Werkzeugmaschinenf Klemmvorrichtung für das lösbare Befestigen eines Werkzeuges in einer Biegepresse
EP1199113A1 (fr) * 1997-07-01 2002-04-24 Wilson Tool International, Inc. Porte-outil de presse-plieuse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2339485A1 (fr) * 1976-01-27 1977-08-26 Colly Pierre Moyen de fixation amovible pour porte-outil de presse-plieuse et similaire
DE3524694A1 (de) * 1985-07-11 1987-01-22 Hilma Gmbh Maschf Spannvorrichtung fuer oberwerkzeuge in abkantpressen
US5022256A (en) * 1988-09-29 1991-06-11 Machinefabriek Wila B.V. Clamping device
DE19513576A1 (de) 1995-04-19 1996-10-31 Guenzburger Werkzeugmaschinenf Klemmvorrichtung für das lösbare Befestigen eines Werkzeuges in einer Biegepresse
EP1199113A1 (fr) * 1997-07-01 2002-04-24 Wilson Tool International, Inc. Porte-outil de presse-plieuse

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1037464A (nl) * 2008-11-11 2010-05-12 Wila Bv Inrichting voor het inspannen van een gereedschap.
WO2010056110A1 (fr) 2008-11-11 2010-05-20 Wila B.V. Dispositif pour le serrage d'un outil
JP2012508115A (ja) * 2008-11-11 2012-04-05 ウィラ・ベスローテン・フェンノートシャップ 工具をクランプするための装置
CN102202811B (zh) * 2008-11-11 2014-10-15 韦拉有限公司 用于对工具进行夹持的装置
US8943870B2 (en) 2008-11-11 2015-02-03 Wila B.V. Device for clamping a tool
ITPC20130024A1 (it) * 2013-09-13 2015-03-14 Rolleri S P A Dispositivo per il bloccaggio di utensili in una pressa piegatrice

Also Published As

Publication number Publication date
EP1413368B1 (fr) 2012-08-29
NL1021707C2 (nl) 2004-04-22

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