EP0442995B1 - Folding press - Google Patents

Folding press Download PDF

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Publication number
EP0442995B1
EP0442995B1 EP90912869A EP90912869A EP0442995B1 EP 0442995 B1 EP0442995 B1 EP 0442995B1 EP 90912869 A EP90912869 A EP 90912869A EP 90912869 A EP90912869 A EP 90912869A EP 0442995 B1 EP0442995 B1 EP 0442995B1
Authority
EP
European Patent Office
Prior art keywords
press
bars
deflection
frames
tables
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.)
Expired - Lifetime
Application number
EP90912869A
Other languages
German (de)
French (fr)
Other versions
EP0442995A1 (en
Inventor
Willem Dieperink
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.)
Beyeler Raskin SA
Original Assignee
Beyeler Raskin SA
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 Beyeler Raskin SA filed Critical Beyeler Raskin SA
Priority to AT90912869T priority Critical patent/ATE101556T1/en
Publication of EP0442995A1 publication Critical patent/EP0442995A1/en
Application granted granted Critical
Publication of EP0442995B1 publication Critical patent/EP0442995B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
    • 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
    • B21D5/0272—Deflection compensating means

Definitions

  • the invention relates to a press brake comprising an upper apron and a lower apron, at least one of the aprons comprising at least one means for moving at least part of at least one member of the press, and a device for comparing the flexion of each of the aprons arranged so as to control the actuation of said displacement means in order to compensate for the difference in flexion of said aprons.
  • some press brakes have compensating cylinders located in one or both of the aprons and which make it possible to compensate for the deformations due to the work of the press and in particular to obtain comparable flexions of the aprons. upper and lower.
  • This press comprises on the edge of at least one of the aprons a means of measuring formations, more particularly by measuring the penetration of the tool or the bending angle of the workpiece.
  • the object of the invention is to remedy the drawbacks.
  • the press brake according to the invention is characterized in that the comparison device comprises two longitudinal bars respectively arranged in longitudinal housings of each of the upper and lower decks, one of the ends of each of the bars being rendered integral with its respective housing, the other ends of each of the bars, free to move longitudinally in their respective housings, being connected to measuring means fixed respectively on each of the upper and lower aprons, so as to measure the respective displacements of said others ends of the bars in their respective housings for any deformations of the upper and lower aprons.
  • the measuring means preferably include linear inductive sensors and are connected to an electronic device arranged so as to automatically control the actuation of the displacement means until compensation for the difference in flexion of the upper and lower aprons.
  • the press brake shown in Figure 1 has an upper deck 1 supporting a punch and a lower deck 2 supporting a die.
  • the lower deck has a plurality of compensating cylinders 3, intended to remedy the defects inherent in the folding process.
  • the movement of these compensation cylinders is controlled by an electronic device 11 such as for example a digital control.
  • the device for comparing the flexion of each of the aprons comprises longitudinal measurement means 4, 5 intended to measure the elongation of said aprons when they bend, said means being connected to the digital control 11.
  • each of the aprons has two longitudinal bars 4, 5, respectively arranged in housings 6, 7 made respectively in the upper deck and in the lower deck.
  • the upper bar 4 is simply placed in the housing 6. It is made integral with the upper deck by a fixing means 14 fixed at one of its ends. During any deformation of the upper deck, the other end of the bar which is free can therefore move freely relative to the housing 6.
  • This other end of the bar is secured to a measuring means 9, such as for example a linear inductive sensor, fixed on the upper apron, at the end of the housing 6.
  • the lower bar 5 is simply placed in the housing 7.
  • One of its ends is fixed to the lower apron by means of fixing 15.
  • a second measuring means 10 similar to measuring means 9, is fixed to the lower bulkhead at the end of the housing 7 and connected to the second end of the bar 5.
  • the two sensors 9 and 10 are connected to the digital control 11, which, inter alia, is arranged so as to receive the signals emitted by each of the sensors 9 and 10 during any bending of the upper and lower aprons, to compare said signals and automatically controlling the actuation of the compensation cylinders 3 until signals at the output of the sensor 10 are obtained which are equal to those obtained at the output of the sensor 9.
  • the surfaces of the two tool holders of the upper and lower aprons will be parallel. The penetration depth of the punch in the die will then be constant over the entire length of the bend.
  • the upper bar 4 can be housed in the lower part of the upper deck, in a housing 6 produced on the surface of one of its faces.
  • This housing can of course be produced at any other location on the upper deck or the upper tool holder.
  • the lower bar 5 shown in Figure 4 is arranged in a housing 7 made at the lower part of the table 8 of the lower deck.
  • This housing can of course also be produced at any other location on the lower deck.

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

Abstract

The folding press is comprised of an upper table (1) and a lower table (2), the lower table having compensation cylinders (3) intended to remedy the defects inherent to the folding process. The press-folder includes an automatic device for comparing the flexion of each of the tables. Said device has two longitudinal bars (4, 5) arranged respectively within longitudinal housings (6, 7) of each of upper and lower tables. One of the extremities of each bar is fixed by fixing means (14, 15) to the extremity of its respective housing. The other extremities of each of the bars are respectively connected to linear inductive sensors (9, 10) secured respectively to each of the tables and connected to a digital control (11) which compares the signals from both sensors and to program automatically the actuation of the compensation cylinders till the flexion difference of the upper and lower tables has been compensated.

Description

L'invention concerne une presse-plieuse comportant un tablier supérieur et un tablier inférieur, l'un des tabliers au moins comportant au moins un moyen de déplacement d'au moins une partie d'au moins un organe de la presse, et un dispositif de comparaison de la flexion de chacun des tabliers agencé de façon à commander l'actionnement dudit moyen de déplacement afin de compenser la différence de flexion desdits tabliers.The invention relates to a press brake comprising an upper apron and a lower apron, at least one of the aprons comprising at least one means for moving at least part of at least one member of the press, and a device for comparing the flexion of each of the aprons arranged so as to control the actuation of said displacement means in order to compensate for the difference in flexion of said aprons.

Lors du pliage avec une presse-plieuse, des déformations se produisent à l'intérieur des deux tabliers, ces déformations étant d'autant plus importantes que les dimensions de la presse sont importantes. Ces déformations dépendent notamment de la forme, des dimensions et de la qualité du matériel à plier, et ne sont généralement pas identiques pour les deux tabliers. En particulier, lors du pliage d'une pièce, sous l'effet de la poussée des pistons des cylindres de travail, généralement disposés à chacune des extrémités de la presse, le tablier supérieur a tendance à se courber vers le haut, impliquant un fléchissement longitudinal vers le haut de la surface du porte-outil supérieur. De la même façon, le tablier inférieur a tendance à se courber vers le bas, entraînant un fléchissement longitudinal vers le bas de la surface du porte-outil inférieur. Il en résulte que les surfaces de travail respectives des deux tabliers et donc des outils ne sont plus parallèles. La profondeur de pénétration du poinçon dans la matrice ne sera alors plus la même sur toute la longueur de la presse. Il s'ensuit que l'angle de pliage obtenu n'est pas le même sur toute la longueur de la pièce que l'on plie.When folding with a press brake, deformations occur inside the two aprons, these deformations being all the more important the larger the dimensions of the press. These deformations depend in particular on the shape, dimensions and quality of the material to be folded, and are generally not identical for the two decks. In particular, when folding a part, under the effect of the thrust of the pistons of the working rolls, generally disposed at each end of the press, the upper deck tends to bend upwards, implying a bending longitudinal upwards from the surface of the upper tool holder. In the same way, the lower deck tends to bend downwards, causing a longitudinal downward bending of the surface of the lower tool holder. As a result, the respective working surfaces of the two decks and therefore of the tools are no longer parallel. The penetration depth of the punch in the die will then no longer be the same over the entire length of the press. It follows that the folding angle obtained is not the same over the entire length of the part that is folded.

Afin de remédier à ces difficultés, certaines presses-plieuses comportent des cylindres de compensation situés dans l'un des tabliers ou dans les deux et qui permettent de compenser les déformations dues au travail de la presse et d'obtenir notamment des flexions comparables des tabliers supérieur et inférieur.In order to overcome these difficulties, some press brakes have compensating cylinders located in one or both of the aprons and which make it possible to compensate for the deformations due to the work of the press and in particular to obtain comparable flexions of the aprons. upper and lower.

C'est le cas notamment de la presse-plieuse décrite dans le brevet CH 653289. Cette presse comporte sur le bord d'au moins un des tabliers un moyen de mesure de de formations, plus particulièrement par la mesure de la pénétration de l'outil ou de l'angle de pliage de la pièce à plier.This is the case in particular of the press brake described in patent CH 653289. This press comprises on the edge of at least one of the aprons a means of measuring formations, more particularly by measuring the penetration of the tool or the bending angle of the workpiece.

Il s'avère que les moyens de mesure et de comparaison utilisés jusqu'à présent ne sont pas satisfaisants notamment du point de vue de leur précision, de leur coût, de leur fiabilité.It turns out that the measurement and comparison means used so far are not satisfactory, in particular from the point of view of their precision, their cost and their reliability.

Le but de l'invention est de remédier aux inconvénients.The object of the invention is to remedy the drawbacks.

A cet effet, la presse-plieuse selon l'invention est caractérisée en ce que le dispositif de comparaison comporte deux barres longitudinales disposées respectivement dans des logements longitudinaux de chacun des tabliers supérieur et inférieur, l'une des extrémités de chacune des barres étant rendue solidaire de son logement respectif, les autres extrémités de chacune des barres, libres de se déplacer longitudinalement dans leur logements respectifs, étant connectées à des moyens de mesure fixés respectivement sur chacun des tabliers supérieur et inférieur, de façon à mesurer les déplacements respectifs desdites autres extrémités des barres dans leurs logements respectifs pour toutes déformations des tabliers supérieur et inférieur.To this end, the press brake according to the invention is characterized in that the comparison device comprises two longitudinal bars respectively arranged in longitudinal housings of each of the upper and lower decks, one of the ends of each of the bars being rendered integral with its respective housing, the other ends of each of the bars, free to move longitudinally in their respective housings, being connected to measuring means fixed respectively on each of the upper and lower aprons, so as to measure the respective displacements of said others ends of the bars in their respective housings for any deformations of the upper and lower aprons.

Les moyens de mesure comportent de préférence des capteurs inductifs linéaires et sont connectés à un dispositif électronique agencé de façon à commander automatiquement l'actionnement des moyens de déplacement jusqu'à compensation de la différence de flexion des tabliers supérieur et inférieur.The measuring means preferably include linear inductive sensors and are connected to an electronic device arranged so as to automatically control the actuation of the displacement means until compensation for the difference in flexion of the upper and lower aprons.

L'invention sera mieux comprise à l'aide de la description d'une forme de réalisation de la presse-plieuse selon l'invention, donnée ci-après à titre d'exemple, en se référant aux dessins annexés dans lesquels :

la fig. 1
est une vue schématique fonctionnelle en perspective d'un exemple de presse-plieuse selon l'invention,
la fig. 2
est une vue partielle de face de la presse montrant un mode d'exécution du dispositif de comparaison de la flexion des tabliers supérieur et inférieur,
la fig. 3
est une coupe partielle selon A-A du tablier supérieur de la presse de la figure 2, et
la fig. 4
est une coupe partielle selon B-B du tablier inférieur de la presse de la figure 2.
The invention will be better understood using the description of an embodiment of the press brake according to the invention, given below by way of example, with reference to the accompanying drawings in which:
fig. 1
is a functional schematic perspective view of an example of a press brake according to the invention,
fig. 2
is a partial front view of the press showing an embodiment of the device for comparing the bending of the upper and lower aprons,
fig. 3
is a partial section along AA of the upper apron of the press of FIG. 2, and
fig. 4
is a partial section along BB of the lower deck of the press in FIG. 2.

La presse-plieuse représentée à la figure 1 comporte un tablier supérieur 1 supportant un poinçon et un tablier inférieur 2 supportant une matrice. Le tablier inférieur comporte une pluralité de cylindres de compensation 3, destinés à remédier aux défauts inhérants au processus de pliage. Le mouvement de ces cylindres de compensation est commandé par un dispositif électronique 11 tel que par exemple une commande numérique. Le dispositif de comparaison de la flexion de chacun des tabliers comporte des moyens de mesure longitudinaux 4, 5 destinés à mesurer l'allongement desdits tabliers lorsqu'ils fléchissent, lesdits moyens étant connectés à la commande numérique 11.The press brake shown in Figure 1 has an upper deck 1 supporting a punch and a lower deck 2 supporting a die. The lower deck has a plurality of compensating cylinders 3, intended to remedy the defects inherent in the folding process. The movement of these compensation cylinders is controlled by an electronic device 11 such as for example a digital control. The device for comparing the flexion of each of the aprons comprises longitudinal measurement means 4, 5 intended to measure the elongation of said aprons when they bend, said means being connected to the digital control 11.

Selon un mode d'exécution du dispositif de comparaison représenté à la figure 2, chacun des tabliers comporte deux barres longitudinales 4, 5, disposées respectivement dans des logements 6, 7 réalisés respectivement dans le tablier supérieur et dans le tablier inférieur. La barre supérieure 4 est simplement posée dans le logement 6. Elle est rendue solidaire du tablier supérieur par un moyen de fixation 14 fixé à l'une de ses extrémités. Lors de toute déformation du tablier supérieur, l'autre extrémité de la barre qui est libre peut donc se déplacer librement par rapport au logement 6. Cette autre extrémité de la barre est solidaire d'un moyen de mesure 9, tel que par exemple un capteur inductif linéaire, fixé sur le tablier supérieur, à l'extrémité du logement 6. De la même façon, la barre inférieure 5 est simplement posée dans le logement 7. L'une de ses extrémités est fixée au tablier inférieur par un moyen de fixation 15. Un second moyen de mesure 10, analogue au moyen de mesure 9, est fixé sur le tablier inférieur à l'extrémité du logement 7 et connecté à la seconde extrémité de la barre 5.According to one embodiment of the comparison device shown in Figure 2, each of the aprons has two longitudinal bars 4, 5, respectively arranged in housings 6, 7 made respectively in the upper deck and in the lower deck. The upper bar 4 is simply placed in the housing 6. It is made integral with the upper deck by a fixing means 14 fixed at one of its ends. During any deformation of the upper deck, the other end of the bar which is free can therefore move freely relative to the housing 6. This other end of the bar is secured to a measuring means 9, such as for example a linear inductive sensor, fixed on the upper apron, at the end of the housing 6. In the same way, the lower bar 5 is simply placed in the housing 7. One of its ends is fixed to the lower apron by means of fixing 15. A second measuring means 10, similar to measuring means 9, is fixed to the lower bulkhead at the end of the housing 7 and connected to the second end of the bar 5.

Les deux capteurs 9 et 10 sont connectés à la commande numérique 11, qui, entre autres, est agencée de façon à recevoir les signaux émis par chacun des capteurs 9 et 10 lors de toute flexion des tabliers supérieur et inférieur, à comparer lesdits signaux et à commander automatiquement l'actionnement des cylindres de compensation 3 jusqu'à l'obtention de signaux à la sortie du capteur 10 égaux à ceux obtenus à la sortie du capteur 9. A ce moment, comme représenté en traits mixtes à la figure 2, les surfaces des deux porte-outil des tabliers supérieur et inférieur seront parallèles. La profondeur de pénétration du poinçon dans la matrice sera alors constante sur toute la longueur de pliage.The two sensors 9 and 10 are connected to the digital control 11, which, inter alia, is arranged so as to receive the signals emitted by each of the sensors 9 and 10 during any bending of the upper and lower aprons, to compare said signals and automatically controlling the actuation of the compensation cylinders 3 until signals at the output of the sensor 10 are obtained which are equal to those obtained at the output of the sensor 9. At this time, as shown in dashed lines in FIG. 2, the surfaces of the two tool holders of the upper and lower aprons will be parallel. The penetration depth of the punch in the die will then be constant over the entire length of the bend.

Comme représenté à la figure 3, la barre supérieure 4 peut être logée dans la partie inférieure du tablier supérieur, dans un logement 6 réalisé à la surface de l'une de ses faces. Ce logement peut bien entendu être réalisé à tout autre endroit du tablier supérieur ou du porte-outil supérieur.As shown in FIG. 3, the upper bar 4 can be housed in the lower part of the upper deck, in a housing 6 produced on the surface of one of its faces. This housing can of course be produced at any other location on the upper deck or the upper tool holder.

La barre inférieure 5 représentée à la figure 4 est disposée dans un logement 7 réalisé à la partie inférieure de la table 8 du tablier inférieur. Ce logement peut bien entendu également être réalisé à tout autre endroit du tablier inférieur.The lower bar 5 shown in Figure 4 is arranged in a housing 7 made at the lower part of the table 8 of the lower deck. This housing can of course also be produced at any other location on the lower deck.

Claims (3)

  1. Folding press comprising an upper frame (1) and a lower frame (2), one of the frames at least comprising at least one deflection means (3) of at least one portion of at least one press member, and a comparison device for comparing the deflection of each of the frames, adapted to control the actuation of said deflection means in order to compensate for a difference in the deflection of said frames, characterized in that the comparison device comprises two longitudinal bars (4,5) arranged, respectively, in longitudinal housings (6,7) of each of the upper and lower frames, one of the end of each of the bars being secured to its corresponding housing, the other end of each bar being free to move longitudinally in their respective housings and being connected to measuring means (9,10) respectively fixed on each of the upper and lower frames for measuring respective movements of said other ends of the bars in their respective housings for all deflections of the upper and lower frames.
  2. Folding press according to claim 1, characterized in that the measuring means include linear inductive sensors (9,10).
  3. Folding press according to anyone of claims 1 or 2, characterized in that the measuring means are connected to an electronic device (11) arranged for automatically programming actuation of the deflection means until the difference in deflection of the upper and lower frames is removed.
EP90912869A 1989-09-11 1990-09-11 Folding press Expired - Lifetime EP0442995B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90912869T ATE101556T1 (en) 1989-09-11 1990-09-11 PRESS BRAKE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3298/89A CH680773A5 (en) 1989-09-11 1989-09-11
CH3298/89 1989-09-11

Publications (2)

Publication Number Publication Date
EP0442995A1 EP0442995A1 (en) 1991-08-28
EP0442995B1 true EP0442995B1 (en) 1994-02-16

Family

ID=4252962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90912869A Expired - Lifetime EP0442995B1 (en) 1989-09-11 1990-09-11 Folding press

Country Status (6)

Country Link
US (1) US5193452A (en)
EP (1) EP0442995B1 (en)
JP (1) JPH04501826A (en)
CH (1) CH680773A5 (en)
DE (1) DE69006713T2 (en)
WO (1) WO1991003371A1 (en)

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DE4214818C2 (en) * 1992-05-05 1994-10-06 Daimler Benz Ag Hydraulic deflection compensation on deep-drawing presses
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US6250216B1 (en) 1999-03-19 2001-06-26 The Minster Machine Company Press deflection controller and method of controlling press deflection
AT411164B (en) * 2000-08-16 2003-10-27 Trumpf Maschinen Austria Gmbh METHOD FOR OPERATING A BENDING PRESSURE AND BENDING PRESSURE, IN PARTICULAR BUTTING PRESSURE
ITTV20010091A1 (en) * 2001-07-06 2003-01-06 Luciano Gasparini INTEGRATOR DEVICE TO DETECT AND RECOVER THE DEFORMATION OF THE SHOULDERS IN A BENDING MACHINE
DE60327042D1 (en) 2003-02-26 2009-05-20 Bystronic Laser Ag Method for correcting a bending process and bending press
US20040231397A1 (en) * 2003-05-23 2004-11-25 Faitel William M. Tonnage monitor for a mechanically driven press
FR2942980B1 (en) * 2009-03-13 2011-04-08 Amada Europ PRESS BRAKE FOR FOLDING SHEETS
TR201112647A2 (en) 2011-12-20 2012-05-21 Durmazlar Maki̇na Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ Dynamic bending mechanism that prevents deflection of sheet metal in press brakes.
WO2014201576A1 (en) * 2013-06-19 2014-12-24 Bruderer Ag Method for warping the machine bed and/or the press ram of a punching press and punching press
JP6243752B2 (en) * 2014-02-25 2017-12-06 株式会社アマダホールディングス Press brake
AT516377B1 (en) * 2015-02-05 2016-05-15 Trumpf Maschinen Austria Gmbh Bending device with measuring device

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JPH0686036B2 (en) * 1986-04-16 1994-11-02 関東自動車工業株式会社 Press machine parallelism measurement device

Also Published As

Publication number Publication date
JPH04501826A (en) 1992-04-02
DE69006713D1 (en) 1994-03-24
CH680773A5 (en) 1992-11-13
US5193452A (en) 1993-03-16
DE69006713T2 (en) 1994-07-14
EP0442995A1 (en) 1991-08-28
WO1991003371A1 (en) 1991-03-21

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