EP0155228A1 - Plate bending machine with a device for controlling the bending angle - Google Patents

Plate bending machine with a device for controlling the bending angle Download PDF

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Publication number
EP0155228A1
EP0155228A1 EP85810020A EP85810020A EP0155228A1 EP 0155228 A1 EP0155228 A1 EP 0155228A1 EP 85810020 A EP85810020 A EP 85810020A EP 85810020 A EP85810020 A EP 85810020A EP 0155228 A1 EP0155228 A1 EP 0155228A1
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EP
European Patent Office
Prior art keywords
folding
angle
sheet
bars
measuring
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.)
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Application number
EP85810020A
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German (de)
French (fr)
Inventor
Willem Dieperink
Arend Vruggink
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 Machines SA
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Beyeler Machines SA
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Filing date
Publication date
Application filed by Beyeler Machines SA filed Critical Beyeler Machines SA
Publication of EP0155228A1 publication Critical patent/EP0155228A1/en
Withdrawn legal-status Critical Current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
    • B21D5/006—Bending sheet metal along straight lines, e.g. to form simple curves combined with measuring of bends
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S72/00—Metal deforming
    • Y10S72/702—Overbending to compensate for springback

Definitions

  • the invention relates to a press for bending sheet metal, the folding device of which allows continuous control of the bending angle of the sheet metal to be bent.
  • the folding angle obtained can exhibit significant variations along the folding line.
  • the causes of these differences in folding angle are mainly due to the following factors: deformations appearing in the press at the time of folding, in particular deformations of the upper apron and deformations of the lower apron, deformations of the amounts of the press and of the tooling, tolerances in the construction of the machine and the tools, wear of the tools, quality of the sheets, and in particular tolerances in the thickness of the sheets.
  • the characteristics of two apparently similar sheets are not always strictly identical, which means that, for the same movement of the tool, it can result in substantially different bending angles for these two sheets.
  • presses of the kind described above require numerous tests and adjustments and, for the most part, oblige the user to predetermine the deformation due to the work of the press.
  • these presses only compensate for the angle differences due to deformations of the machine, the uprights and the upper and lower aprons, but not the other differences, due for example to local deformations of the die or the punch. or the wear of these.
  • these presses do not make it possible to solve the problem of obtaining a constant precision of the bending angle from one sheet to another. Indeed, from one batch of sheets to another, and even for the same batch of sheets, the characteristics of the sheets, in particular their thickness, their resistance or their elasticity, are not always strictly identical from one sheet to another .
  • Presses which make it possible to measure the folding angle during the folding cycle. These are, for example, presses described in patent applications FR 2 362 722, DE 2 044 199 and in US patent 3,440,847.
  • the control devices described in the above patents are not very precise. In fact, their arrangement is such that they measure the folding angle outside the die, which generally results in a significant error due to the weight of the sheet.
  • a more precise measurement of the folding angle is obtained with the device described in patent application GB 2 072 551, which makes it possible to measure the angle at the location of the folding, in the matrix.
  • this device does not allow a correct measurement in the case of asymmetrical folding which occurs, for example, when the sheet is folded near one of its edges, one of the two sides of the sheet then being significantly more heavy than the other.
  • a control device allowing a more precise measurement of the bending angle is described in the German utility model G 82 34 901.0, which relates to a small press for bending metal profiles.
  • the folding angle is determined at the location of the folding using two measuring bars, each having a flat surface on which the profile rests during folding, these bars being arranged so as to undergo rotation during folding.
  • Measuring bars of similar shape can advantageously be used in a device for controlling the bending angle of the presses for bending sheets.
  • the object of the present invention is to provide a press for bending sheets, which allows continuous and automatic control of the bending angle of the sheet and which allows to obtain automatically and with very high precision the imposed bending angle, the bending angle being obtained constant over the entire length of the sheet.
  • the present invention relates to a press for bending sheets, as defined in claim 1.
  • the invention also relates to a method of actuating the press, as defined in claim 10.
  • the press comprises an upper apron 1 and a lower apron 2.
  • the upper apron supports a punch 3 and the lower apron a tool holder 4.
  • the upper apron is provided with two jacks 17, 17 'intended to set the punch in motion 3.
  • Displacement means 5 are located in a slot made in the lower deck. They are intended to remedy the defects inherent in the folding process listed above, such as deformations appearing in the press at the time of folding, the quality of the sheets, etc.
  • the sheet bending angle control device comprises two pairs of measuring bars 6, 6 'and a series of pairs of measuring bars 16, 16', each of the bars 6, 6 'and 16, 16' being of round section and longitudinally truncated so as to present a flat upper surface 7, the two bars of a couple being housed side by side in a housing arranged on the surface of the tool holder 4, the two pairs of measuring bars 6 , 6 'being arranged respectively above the uprights 18, 18' of the press, the pairs of bars 16, 16 'being arranged above the displacement means 5, so that each displacement means 5 corresponds to a pair of measuring bars 16, 16 '.
  • the pairs of measuring bars are arranged end to end, so that the flat surfaces 7 constitute two continuous surfaces.
  • Each measuring bar is integral with a measuring device 8 intended to measure the angle of rotation of the bar.
  • each measuring device 8 consists of two potentiometers, each of them being arranged inside one of the two bars 6, 6 'or 16, 16'.
  • the control device further comprises a control device 9 connected to the various measurement devices 8, to control means 13, 13 ′ of the jacks 17, 17 ′ for actuating the movement of the punch 3 as well as to means of control 15 of the displacement means 5.
  • the control of the folding angle of the sheet to be folded 10 is carried out as follows: at the start of the folding operation, the sheet is put in place so that its surface lower is in contact with the flat surfaces 7 of the measuring bars.
  • the value of the imposed folding angle is indicated at a control station 11.
  • the entire folding operation will then be carried out continuously and automatically, without requiring the intervention of an operator.
  • the measuring bars when the sheet 10 begins to bend under the force due to the punch 3, the measuring bars, the flat rectified surfaces of which 7 remain in close contact with the lower surface of the sheet, will undergo a rotation whose angle will be measured by the measuring devices 8, the angles of rotation a and measured absolutely for each of the two bars 6, 6 'or 16, 16' of a pair of bars being added by the control device 9, so as to determine the instantaneous local folding angle y of the sheet.
  • the control device 9 is arranged so as to be able to compare the various instantaneous local values of the folding angle and to control the actuation of one or more displacement means 5, so as to standardize the folding angle over the entire length of the sheet and to control the continuation of the movement of the punch 3 via the control means 13, 13 'of the jacks 17, 17', so as to continue the folding operation without interruption, the same process repeating continuously and automatically until the required and constant bending angle is obtained along the entire length of the sheet.
  • the control device is arranged so that the thrusts exerted by each of the jacks 17, 17 'can be different.
  • the comparison between them of the measured local values of the folding angle is carried out by electronic means 14, electronic means 12 making it possible to compare these values with the angle of imposed folding, the control means 13, 13 'of the jacks 17, 17' are constituted by servo-valves, the control means 15 of the displacement means 5 being constituted by pressure valves or servo-valves, in number equal to that of the displacement means 5.
  • the punch stroke is imposed, which must be determined beforehand.
  • the stroke of the punch being controlled continuously by the control device 9, until the angle of imposed folding, this angle being obtained with very high precision, and constant over the entire length of the sheet.
  • the folding process no longer requiring operator intervention at any time, and the folding operation taking place without apparent interruption of the folding movement, this results in an appreciable saving of time.
  • the problem of the variation of the folding angle which can occur after the end of the folding movement, when an expansion of the sheet occurs, is easily solved with the present press.
  • the control device 9 controls the automatic discharge of the force applied to the punch. If a change in the bending angle is detected (due to the sheet metal relaxing), the bending process resumes bending to a bending angle less than the imposed value, so as to take account of the new planned relaxation of the sheet, the process repeating until the required bending angle is obtained.
  • the measuring bars are arranged in a housing arranged on the surface of the tool holder. According to another variant of the press, the measuring bars are arranged in a housing directly arranged in the apron, the tool holder 4 being absent. In the variant described, the measuring bars are arranged so as to be integral with the lower bulkhead. In another variant, the functions of the two aprons are reversed and the measuring bars are arranged in the upper apron or on the surface of a tool holder supported by the upper apron, the punch being integral with the lower apron.
  • the displacement means 5 are arranged in the lower deck. Of course, it is also possible to arrange them in the upper deck or to arrange them in each of the upper and lower decks. In particular, the displacement means 5 can be arranged inside a slot arranged in one of the aprons.
  • the lower apron consists of two parts, the first part constituting a support apron supporting the displacement means 5, which support one or more flexible aprons on the surface of which are housed the pairs of measuring bars.
  • the folding device comprises five displacement means 5, opposite which are arranged respectively five pairs of measuring bars 16, 16 '.
  • All the operations of the folding cycle including in particular the work of the control device 9 for controlling the actuation of the displacement means 5 and of the devices for controlling the movement of the punch are carried out automatically until very precise bending angle imposed.
  • the presses according to the invention have many advantages. Indeed, the combination of the displacement means 5 and the pairs of measuring bars associated with the control means 9 makes it possible to eliminate, on the one hand, the differences in bending angle due, for the same sheet, to one any of the deformations seen above, whether the deformations of the machine, the uprights, the upper or lower aprons, the die or the punch, or to the sheet thickness tolerances, and, on the other On the other hand, the differences in bending angle from one sheet to another, due to the differences in thickness, resistance and elasticity of the sheets.
  • the presses according to the invention make it possible to remedy the drawbacks of asymmetric folding and those due to a non-parallel movement of the punch. In the latter case, the folding angle will be obtained constant over the entire length of the folding, even for thin sheets, provided that they are positioned so that they rest on at least two pairs of measuring bars .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

La presse comporte un tablier supérieur (1) supportant un poinçon (3) et un tablier inférieur (2) supportant un porte-outil (4). Des moyens de déplacement (5) destinés a remédier aux défauts inhérents au processus de pliage sont aménagés dans le tablier inférieur. Le dispositif de pliage de la presse permet un contrôle de continu de l'angle de pliage de la tôle. Il comporte une série de couples de barres de mesure (6, 6' et 16, 16') de section ronde, tronquées longitudinalement de façon à présenter une surface plane (7) destinée à servir d'appui à la surface inférieure de la tôle (10), associées à des dispositifs (8, 8') de mesure de l'angle de rotation des barres de mesure, et un dispositif de commande (9) connecté aux dispositifs (8, 8') de mesure, aux moyens de commande (13, 13') des vérins (17, 17') d'actionnement du poinçon (3) et aux moyens de commande (15) des moyens de déplacement (5). Ce dispositif est agencé de façon à permettre l'obtention de l'angle de pliage imposé de manière très précise et constant sur toute la longueur de la tôle. Le processus de pliage est continu et automatique, après indication par l'opérateur de l'angle de pliage imposé.The press comprises an upper apron (1) supporting a punch (3) and a lower apron (2) supporting a tool holder (4). Displacement means (5) intended to remedy the defects inherent in the folding process are arranged in the lower deck. The press folding device allows continuous control of the sheet bending angle. It comprises a series of pairs of measuring bars (6, 6 'and 16, 16') of round section, cut longitudinally so as to present a flat surface (7) intended to serve as a support for the lower surface of the sheet (10), associated with devices (8, 8 ') for measuring the angle of rotation of the measuring bars, and a control device (9) connected to the devices (8, 8') for measurement, with the means of control (13, 13 ') of the jacks (17, 17') for actuating the punch (3) and to the control means (15) of the displacement means (5). This device is arranged so as to allow the bending angle imposed very precisely and constantly to be obtained over the entire length of the sheet. The folding process is continuous and automatic, after indication by the operator of the imposed folding angle.

Description

L'invention concerne une presse pour le pliage de tôle, dont le dispositif de pliage permet un contrôle continu de l'angle de pliage de la tôle à plier.The invention relates to a press for bending sheet metal, the folding device of which allows continuous control of the bending angle of the sheet metal to be bent.

Lors du pliage d'une tôle à l'aide d'une presse, les difficultés rencontrées pour l'obtention de l'angle de pliage imposé sont de deux types :

  • 1) obtenir un angle de pliage constant sur toute la longueur de la tôle,
  • 2) obtenir un angle de pliage présentant la même précision d'une tôle à une autre.
When bending a sheet using a press, the difficulties encountered in obtaining the imposed bending angle are of two types:
  • 1) obtain a constant bending angle over the entire length of the sheet,
  • 2) obtain a bending angle having the same precision from one sheet to another.

En effet, avec les presses conventionnelles, l'angle de pliage obtenu peut présenter des variations importantes le long de la ligne de pliage. Les causes de ces différences d'angle de pliage sont dues principalement aux facteurs suivants : déformations apparaissant dans la presse au moment du pliage, notamment déformations du tablier supérieur et déformations du tablier inférieur, déformations des montants de la presse et de l'outillage, tolérances dans la construction de la machine et des outils, usure des outils, qualité des tôles, et notamment tolérances dans l'épaisseur des tôles. D'autre part, les caractéristiques de deux tôles apparemment semblables ne sont pas toujours rigoureusement identiques, ce qui entraîne que, pour un même mouvement de l'outil, il peut résulter des angles de pliage sensiblement différents pour ces deux tôles.In fact, with conventional presses, the folding angle obtained can exhibit significant variations along the folding line. The causes of these differences in folding angle are mainly due to the following factors: deformations appearing in the press at the time of folding, in particular deformations of the upper apron and deformations of the lower apron, deformations of the amounts of the press and of the tooling, tolerances in the construction of the machine and the tools, wear of the tools, quality of the sheets, and in particular tolerances in the thickness of the sheets. On the other hand, the characteristics of two apparently similar sheets are not always strictly identical, which means that, for the same movement of the tool, it can result in substantially different bending angles for these two sheets.

Parmi les systèmes actuellement connus, différents systèmes permettent de remédier partiellement aux difficultés ci-dessus, en particulier certains d'entre eux utilisent des cylindres de compensation qui permettent de compenser en partie les déformations dues au travail de la presse, dans le but d'obtenir un angle de pliage constant sur toute la longueur de la tôle. On peut citer, par exemple, le brevet FR 2 119 528 qui décrit une presse comportant des cylindres de compensation situés dans le tablier inférieur, la demande de brevet européen publiée sous No O 025 469 qui décrit une presse comportant des cylindres de compensation situés dans le tablier supérieur et la demande de brevet FR 2 200 064 qui décrit une presse comportant des cylindres de compensation situés dans les tabliers supérieur et inférieur. Malheureusement, les presses du genre décrit ci-dessus nécessitent de nombreux essais et réglages et, pour la plupart, obligent l'utilisateur à prédéterminer la déformation due au travail de la presse. De plus, ces presses ne permettent que de compenser les différences d'angle dues aux déformations de la machine, des montants et des tabliers supérieur et inférieur, mais non pas les autres différences, dues par exemple aux déformations locales de la matrice ou du poinçon ou à l'usure de ces derniers. D'autre part, ces presses ne permettent pas de résoudre le problème de l'obtention d'une précision constante de l'angle de pliage d'une tôle à une autre. En effet, d'un lot de tôles à un autre, et même pour un même lot de tôles, les caractéristiques des tôles, notamment leur épaisseur, leur résistance ou leur élasticité, ne sont pas toujours rigoureusement identiques d'une tôle à une autre. De même, pour une même tôle, d'un endroit à un autre de la tôle, ces caractéristiques peuvent varier. Il s'ensuit que, pour un même mouvement du poinçon, les angles de pliage obtenus pour deux tôles différentes, ou pour une même tôle en des emplacements différents, peuvent être sensiblement différents. Pour remédier à ces inconvénients pendant le cycle de pliage, il est nécessaire de pouvoir contrôler l'angle du pliage pendant le pliage.Among the systems currently known, various systems make it possible to partially remedy the above difficulties, in particular some of them use compensation cylinders which make it possible to partially compensate for the deformations due to the work of the press, with the aim of obtain a constant bending angle over all the length of the sheet. Mention may be made, for example, of patent FR 2 119 528 which describes a press comprising compensating cylinders located in the lower deck, the European patent application published under No O 025 469 which describes a press comprising compensating cylinders located in the upper apron and patent application FR 2 200 064 which describes a press comprising compensation cylinders located in the upper and lower aprons. Unfortunately, presses of the kind described above require numerous tests and adjustments and, for the most part, oblige the user to predetermine the deformation due to the work of the press. In addition, these presses only compensate for the angle differences due to deformations of the machine, the uprights and the upper and lower aprons, but not the other differences, due for example to local deformations of the die or the punch. or the wear of these. On the other hand, these presses do not make it possible to solve the problem of obtaining a constant precision of the bending angle from one sheet to another. Indeed, from one batch of sheets to another, and even for the same batch of sheets, the characteristics of the sheets, in particular their thickness, their resistance or their elasticity, are not always strictly identical from one sheet to another . Similarly, for the same sheet, from one place to another of the sheet, these characteristics may vary. It follows that, for the same movement of the punch, the folding angles obtained for two different sheets, or for the same sheet in different locations, can be substantially different. To overcome these drawbacks during the folding cycle, it is necessary to be able to control the angle of the folding during folding.

On connaît des presses qui permettent de mesurer l'angle de pliage pendant le cycle de pliage. Il s'agit, par exemple, des presses décrites dans les demandes de brevet FR 2 362 722, DE 2 044 199 et dans le brevet US 3 440 847. Toutefois, les dispositifs de contrôle décrits dans les brevets ci-dessus sont peu précis. En effet, leur agencement est tel qu'ils effectuent la mesure de l'angle de pliage en dehors de la matrice, ce qui entraîne généralement une erreur importante due au poids de la tôle. Une mesure de l'angle de pliage plus précise est obtenue avec le dispositif décrit dans la demande de brevet GB 2 072 551, qui permet de mesurer l'angle à l'endroit du pliage, dans la matrice. Toutefois, ce dispositif ne permet pas une mesure correcte en cas de pliage asymétrique qui se produit, par exemple, lorsque l'on plie la tôle près d'un de ses bords, l'un des deux pans de la tôle étant alors nettement plus lourd que l'autre.Presses are known which make it possible to measure the folding angle during the folding cycle. These are, for example, presses described in patent applications FR 2 362 722, DE 2 044 199 and in US patent 3,440,847. However, the control devices described in the above patents are not very precise. In fact, their arrangement is such that they measure the folding angle outside the die, which generally results in a significant error due to the weight of the sheet. A more precise measurement of the folding angle is obtained with the device described in patent application GB 2 072 551, which makes it possible to measure the angle at the location of the folding, in the matrix. However, this device does not allow a correct measurement in the case of asymmetrical folding which occurs, for example, when the sheet is folded near one of its edges, one of the two sides of the sheet then being significantly more heavy than the other.

Un dispositif de contrôle permettant une mesure plus précise de l'angle de pliage est décrit dans le modèle d'utilité allemand G 82 34 901.0, qui concerne une petite presse pour le pliage de profilés métalliques. Dans ce dispositif, l'angle de pliage est déterminé à l'endroit du pliage à l'aide de deux barres de mesure présentant chacune une surface plane sur laquelle s'appuie le profilé lors du pliage, ces barres étant agencées de façon à subir une rotation lors du pliage. Des barres de mesure de forme semblable peuvent avantageusement être utilisées dans un dispositif de contrôle de l'angle de pliage des presses pour le pliage de tôles.A control device allowing a more precise measurement of the bending angle is described in the German utility model G 82 34 901.0, which relates to a small press for bending metal profiles. In this device, the folding angle is determined at the location of the folding using two measuring bars, each having a flat surface on which the profile rests during folding, these bars being arranged so as to undergo rotation during folding. Measuring bars of similar shape can advantageously be used in a device for controlling the bending angle of the presses for bending sheets.

Le but de la présente invention est de proposer une presse pour le pliage de tôles, qui permette un contrôle continu et automatique de l'angle de pliage de la tôle et qui permette d'obtenir de façon automatique et avec une très grande précision l'angle de pliage imposé, l'angle de pliage étant obtenu constant sur toute la longueur de la tôle.The object of the present invention is to provide a press for bending sheets, which allows continuous and automatic control of the bending angle of the sheet and which allows to obtain automatically and with very high precision the imposed bending angle, the bending angle being obtained constant over the entire length of the sheet.

A cet effet, la présente invention concerne une presse pour le pliage de tôles, telle que définie dans la revendication 1.To this end, the present invention relates to a press for bending sheets, as defined in claim 1.

L'invention concerne également un procédé de mise en action de la presse, tel que défini à la revendication 10.The invention also relates to a method of actuating the press, as defined in claim 10.

On comprendra mieux l'invention à l'aide de la description qui suit d'un exemple de presse selon l'invention et qui se rapporte au dessin, sur lequel la

  • fig. 1 représente une coupe schématique longitudinale d'un exemple de presse selon l'invention ;
  • fig. 2 représente, en coupe latérale partielle, un exemple de couple de deux barres de mesure avant le pliage, et
  • fig. 3 représente, en coupe latérale partielle, un exemple de couple de deux barres de mesure pendant le pliage.
The invention will be better understood using the following description of an example press according to the invention and which relates to the drawing, in which the
  • fig. 1 shows a schematic longitudinal section of an example press according to the invention;
  • fig. 2 shows, in partial side section, an example of a pair of two measuring bars before folding, and
  • fig. 3 shows, in partial side section, an example of a couple of two measuring bars during folding.

La presse comprend un tablier supérieur 1 et un tablier inférieur 2. Le tablier supérieur supporte un poinçon 3 et le tablier inférieur un porte-outil 4. Le tablier supérieur est muni de deux vérins 17, 17' destinés à la mise en mouvement du poinçon 3. Des moyens de déplacement 5 sont situés dans une fente pratiquée dans le tablier inférieur. Ils sont destinés à remédier aux défauts inhérents au processus de pliage énumérés plus haut, tels que les déformations apparaissant dans la presse au moment du pliage, la qualité des tôles, etc. Le dispositif de contrôle de l'angle de pliage de la tôle comporte deux couples de barres de mesure 6, 6' et une série de couples de barres de mesure 16, 16', chacune des barres 6, 6' et 16, 16' étant de section ronde et tronquée longitudinalement de façon à présenter une surface supérieure plane 7, les deux barres d'un couple étant logées côte à côte dans un logement aménagé à la surface du porte-outil 4, les deux couples de barres de mesure 6, 6' étant disposés respectivement au-dessus des montants 18, 18' de la presse, les couples de barres 16, 16' étant disposés au-dessus des moyens de déplacement 5, de façon qu'à chaque moyen de déplacement 5 corresponde un couple de barres de mesure 16, 16'. Les couples de barres de mesure sont disposés bout à bout, de façon que les surfaces planes 7 constituent deux surfaces continues.The press comprises an upper apron 1 and a lower apron 2. The upper apron supports a punch 3 and the lower apron a tool holder 4. The upper apron is provided with two jacks 17, 17 'intended to set the punch in motion 3. Displacement means 5 are located in a slot made in the lower deck. They are intended to remedy the defects inherent in the folding process listed above, such as deformations appearing in the press at the time of folding, the quality of the sheets, etc. The sheet bending angle control device comprises two pairs of measuring bars 6, 6 'and a series of pairs of measuring bars 16, 16', each of the bars 6, 6 'and 16, 16' being of round section and longitudinally truncated so as to present a flat upper surface 7, the two bars of a couple being housed side by side in a housing arranged on the surface of the tool holder 4, the two pairs of measuring bars 6 , 6 'being arranged respectively above the uprights 18, 18' of the press, the pairs of bars 16, 16 'being arranged above the displacement means 5, so that each displacement means 5 corresponds to a pair of measuring bars 16, 16 '. The pairs of measuring bars are arranged end to end, so that the flat surfaces 7 constitute two continuous surfaces.

Chaque barre de mesure est solidaire d'un dispositif 8 de mesure destiné à mesurer l'angle de rotation de, la barre. Dans l'exemple représenté sur les figures, chaque dispositif 8 de mesure est constitué par deux potentiomètres, chacun d'eux étant disposé à l'intérieur d'une des deux barres 6, 6' ou 16, 16'. Le dispositif de contrôle comporte en outre un dispositif de commande 9 connecté aux différents dispositifs 8 de mesure, à des moyens de commande 13,13' des vérins 17, 17' d'actionnement du mouvement du poinçon 3 ainsi qu'à des moyens de commande 15 des moyens de déplacement 5. Le contrôle de l'angle de pliage de la tôle à plier 10 s'effectue de la façon suivante : au début de l'opération de pliage, la tôle est mise en place de façon que sa surface inférieure se trouve en contact avec les surfaces planes 7 des barres de mesure. La valeur de l'angle de pliage imposé est indiquée à un poste de commande 11. Toute l'opération de pliage va alors s'effectuer de façon continue et automatique, sans nécessiter l'intervention d'un opérateur. Lors de l'opération de pliage, lorsque la tôle 10 va commencer à se plier sous l'effort dû au poinçon 3, les barres de mesure, dont les surfaces rectifiées planes 7 restent en contact étroit avec la surface inférieure de la tôle, vont subir une rotation dont l'angle sera mesuré par les dispositifs 8 de mesure, les angles de rotation a et mesurés de façon absolue pour chacune des deux barres 6, 6' ou 16, 16' d'un couple de barres étant additionnés par le dispositif de commande 9, de façon à déterminer l'angle de pliage local instantané y de la tôle. Le dispositif de commande 9 est agencé de façon à pouvoir comparer les diverses valeurs locales instantanées de l'angle de pliage et à commander la mise en action d'un ou plusieurs moyens de déplacement 5, de façon à uniformiser l'angle de pliage sur toute la longueur de la tôle et à commander la poursuite du mouvement du poinçon 3 par l'intermédiaire des moyens de commande 13, 13' des vérins 17, 17', de façon à continuer l'opération de pliage sans interruption, le même processus se répétant de façon continue et automatique jusqu'à l'obtention de l'angle de pliage imposé et constant sur toute la longueur de la tôle. Le dispositif de commande est agencé de façon que les poussées exercées par'chacun des vérins 17, 17' puissent être différentes.Each measuring bar is integral with a measuring device 8 intended to measure the angle of rotation of the bar. In the example shown in the figures, each measuring device 8 consists of two potentiometers, each of them being arranged inside one of the two bars 6, 6 'or 16, 16'. The control device further comprises a control device 9 connected to the various measurement devices 8, to control means 13, 13 ′ of the jacks 17, 17 ′ for actuating the movement of the punch 3 as well as to means of control 15 of the displacement means 5. The control of the folding angle of the sheet to be folded 10 is carried out as follows: at the start of the folding operation, the sheet is put in place so that its surface lower is in contact with the flat surfaces 7 of the measuring bars. The value of the imposed folding angle is indicated at a control station 11. The entire folding operation will then be carried out continuously and automatically, without requiring the intervention of an operator. During the folding operation, when the sheet 10 begins to bend under the force due to the punch 3, the measuring bars, the flat rectified surfaces of which 7 remain in close contact with the lower surface of the sheet, will undergo a rotation whose angle will be measured by the measuring devices 8, the angles of rotation a and measured absolutely for each of the two bars 6, 6 'or 16, 16' of a pair of bars being added by the control device 9, so as to determine the instantaneous local folding angle y of the sheet. The control device 9 is arranged so as to be able to compare the various instantaneous local values of the folding angle and to control the actuation of one or more displacement means 5, so as to standardize the folding angle over the entire length of the sheet and to control the continuation of the movement of the punch 3 via the control means 13, 13 'of the jacks 17, 17', so as to continue the folding operation without interruption, the same process repeating continuously and automatically until the required and constant bending angle is obtained along the entire length of the sheet. The control device is arranged so that the thrusts exerted by each of the jacks 17, 17 'can be different.

Selon un mode d'exécution préférentiel de la presse, la comparaison entre elles des valeurs locales mesurées de l'angle de pliage est effectuée par des moyens électroniques 14, des moyens électroniques 12 permettant d'effectuer la comparaison de ces valeurs avec l'angle de pliage imposé, les moyens de commande 13, 13' des vérins 17, 17' sont constitués par des servo-valves, les moyens de commande 15 des moyens de déplacement 5 étant constitués par des valves de pression ou des servo-valves, en nombre égal à celui des moyens de déplacement 5.According to a preferred embodiment of the press, the comparison between them of the measured local values of the folding angle is carried out by electronic means 14, electronic means 12 making it possible to compare these values with the angle of imposed folding, the control means 13, 13 'of the jacks 17, 17' are constituted by servo-valves, the control means 15 of the displacement means 5 being constituted by pressure valves or servo-valves, in number equal to that of the displacement means 5.

Dans les presses-plieuses conventionnelles, on impose la course du poinçon qu'il faut préalablement déterminer. Par contre, pour la presse selon l'invention, il suffit d'indiquer la valeur de l'angle de pliage désiré, la course du poinçon étant commandée de façon continue par le dispositif de commande 9, jusqu'à obtenir l'angle de pliage imposé, cet angle étant obtenu avec une très grande précision, et constant sur toute la longueur de la tôle. En outre, le processus de pliage ne nécessitant plus à aucun moment l'intervention d'un opérateur,.et l'opération de pliage se déroulant sans interruption apparente du mouvement de pliage, il en résulte un gain de temps appréciable. D'autre part, le problème de la variation de l'angle de pliage qui peut intervenir après la fin du mouvement de pliage, lorsqu'il se produit une détente de la tôle, est aisément résolu avec la présente presse. En effet, il est possible d'agencer le dispositif de commande 9 de façon que, lorsque l'angle de pliage imposé est atteint, ce dispositif commande la décharge automatique de l'effort appliqué sur le poinçon. Si une variation de l'angle de pliage est décelée (due à la détente de la tôle), le processus de pliage reprend en pliant jusqu'à un angle de pliage inférieur à la valeur imposée, de façon à tenir compte de la nouvelle déténte prévue de la tôle, le processus se répétant jusqu'à obtention de l'angle de pliage imposé. Dans la presse décrite ci-dessus, les barres de mesure.sont disposées dans un logement aménagé à la surface du porte-outil. Selon une autre variante d'exécution de la presse, les barres de mesure sont disposées dans un logement directement aménagé dans le tablier, le porte-outil 4 étant absent. Dans la variante d'exécution décrite, les barres de mesure sont disposées de façon à être solidaires du tablier inférieur. Dans une autre variante, les fonctions des deux tabliers sont inversées et les barres de mesure, sont disposées dans le tablier supérieur ou à la surface d'un porte-outil supporté par le tablier supérieur, le poinçon étant solidaire du tablier inférieur.In conventional press brakes, the punch stroke is imposed, which must be determined beforehand. On the other hand, for the press according to the invention, it suffices to indicate the value of the desired folding angle, the stroke of the punch being controlled continuously by the control device 9, until the angle of imposed folding, this angle being obtained with very high precision, and constant over the entire length of the sheet. In addition, the folding process no longer requiring operator intervention at any time, and the folding operation taking place without apparent interruption of the folding movement, this results in an appreciable saving of time. On the other hand, the problem of the variation of the folding angle which can occur after the end of the folding movement, when an expansion of the sheet occurs, is easily solved with the present press. Indeed, it is possible to arrange the control device 9 so that, when the imposed folding angle is reached, this device controls the automatic discharge of the force applied to the punch. If a change in the bending angle is detected (due to the sheet metal relaxing), the bending process resumes bending to a bending angle less than the imposed value, so as to take account of the new planned relaxation of the sheet, the process repeating until the required bending angle is obtained. In the press described above, the measuring bars are arranged in a housing arranged on the surface of the tool holder. According to another variant of the press, the measuring bars are arranged in a housing directly arranged in the apron, the tool holder 4 being absent. In the variant described, the measuring bars are arranged so as to be integral with the lower bulkhead. In another variant, the functions of the two aprons are reversed and the measuring bars are arranged in the upper apron or on the surface of a tool holder supported by the upper apron, the punch being integral with the lower apron.

Dans la variante d'exécution décrite ci-dessus, les moyens de déplacement 5 sont disposés dans le tablier inférieur. Bien entendu, il est aussi possible de les disposer dans le tablier supérieur ou d'en disposer dans chacun des tabliers supérieur et inférieur. En particulier, les moyens de déplacement 5 peuvent être disposés à l'intérieur d'une fente aménagée dans l'un des tabliers. Dans une variante intéressante, le tablier inférieur se compose de deux parties, la première partie constituant un tablier porteur supportant les moyens de déplacement 5, qui supportent un ou plusieurs tabliers flexibles à la surface desquels sont logés les couples de barres de mesure.In the embodiment described above, the displacement means 5 are arranged in the lower deck. Of course, it is also possible to arrange them in the upper deck or to arrange them in each of the upper and lower decks. In particular, the displacement means 5 can be arranged inside a slot arranged in one of the aprons. In an interesting variant, the lower apron consists of two parts, the first part constituting a support apron supporting the displacement means 5, which support one or more flexible aprons on the surface of which are housed the pairs of measuring bars.

Dans la variante représentée sur les figures, le dispositif de pliage comporte cinq moyens de déplacement 5, en regard desquels sont disposés respectivement cinq couples de barres de mesure 16, 16'. Les montants de la presse, au-dessus desquels sont disposés respectivement les deux couples de barres de mesure 6, 6', jouent un rôle de "pistons.fixes". Selon la longueur de la presse, et selon la précision de l'angle de pliage que l'on désire obtenir le long de la tôle, le nombre de moyens de déplacement 5 et de couples de barres de mesure 16, 16' correspondants sera choisi plus ou moins grand.In the variant shown in the figures, the folding device comprises five displacement means 5, opposite which are arranged respectively five pairs of measuring bars 16, 16 '. The amounts of the press, above which the two pairs of measuring bars 6, 6 ′ are respectively disposed, act as "fixed pistons". According to the length of the press, and according to the precision of the folding angle that it is desired to obtain along the sheet, the number of displacement means 5 and pairs of corresponding measuring bars 16, 16 ′ will be chosen larger or smaller.

Toutes les opérations du cycle de pliage, comprenant en particulier le travail du dispositif de commande 9 pour la commande de l'actionnement des moyens de déplacement 5 et des dispositifs de commande du mouvement du poinçon s'effectuent automatiquement jusqu'à l'obtention très précise de l'angle de pliage imposé.All the operations of the folding cycle, including in particular the work of the control device 9 for controlling the actuation of the displacement means 5 and of the devices for controlling the movement of the punch are carried out automatically until very precise bending angle imposed.

Par rapport aux presses de l'art antérieur, les presses selon l'invention présentent de nombreux avantages. En effet, la combinaison des moyens de déplacement 5 et des couples de barres de mesure associés au moyen de commande 9 permet de supprimer, d'une part, les différences d'angle de pliage dues, pour une même tôle, à l'une quelconque des déformations vues plus haut, qu'il s'agisse des déformations de la machine, des montants, des tabliers inférieur ou supérieur, de la matrice ou du poinçon, ou aux tolérances d'épaisseur de la tôle, et, d'autre part, les différences d'angle de pliage d'une tôle à une autre, dues aux différences d'épaisseur, de résistance et d'élasticité des tôles. De plus, les presses selon l'invention permettent de remédier aux inconvénients d'un pliage asymétrique et à ceux dus à un mouvement non parallèle du poinçon. Dans ce dernier cas, l'angle de pliage sera obtenu constant sur toute la longueur du pliage, même pour des tôles de faibles largeurs, à condition de les positionner de façon qu'elles s'appuient sur au moins deux couples de barres de mesure.Compared to the presses of the prior art, the presses according to the invention have many advantages. Indeed, the combination of the displacement means 5 and the pairs of measuring bars associated with the control means 9 makes it possible to eliminate, on the one hand, the differences in bending angle due, for the same sheet, to one any of the deformations seen above, whether the deformations of the machine, the uprights, the upper or lower aprons, the die or the punch, or to the sheet thickness tolerances, and, on the other On the other hand, the differences in bending angle from one sheet to another, due to the differences in thickness, resistance and elasticity of the sheets. In addition, the presses according to the invention make it possible to remedy the drawbacks of asymmetric folding and those due to a non-parallel movement of the punch. In the latter case, the folding angle will be obtained constant over the entire length of the folding, even for thin sheets, provided that they are positioned so that they rest on at least two pairs of measuring bars .

Claims (12)

1. Presse pour le pliage de tôles comportant un tablier supérieur (1) et un tablier inférieur (2), un des tabliers supportant un poinçon (3), presse comportant deux moyens d'actionnement (17, 17') du mouvement du poinçon et au moins un moyen de déplacement (5) destiné à remédier aux inconvénients inhérents au processus de pliage, caractérisée en ce qu'elle comporte un dispositif de pliage destiné à un contrôle continu de l'angle de pliage de la tôle et comportant : a) deux couples de barres de mesure (6, 6'), situées en regard des montants de la presse (18, 18'), et au moins un couple de barres de mesure (16, 16') situées en regard du moyen de déplacement (5), les barres de mesure (6, 6', et 16, 16') étant de section ronde, tronquées longitudinalement de façon à présenter une surface plane (7) destinée à servir d'appui à l'une des surfaces de la tôle à plier, chacune des barres de mesure étant agencée de façon à pouvoir tourner lors du pliage de la tôle, chacun des couples de barres de mesure étant associé à un dispositif (8) de mesure de l'angle de rotation des barres de mesure, b) un dispositif de commande (9) connecté aux dispositifs (8) de mesure, aux moyens d'actionnement (17, 17') du mouvement du poinçon (3) et.au moyen de déplacement (5) et comportant : - des premiers moyens (12) destinés à comparer avec la valeur imposée les signaux donnés par les dispositifs (8) de mesure, - des deuxièmes moyens (13,13') destinés à commander les moyens d'actionnement (17,17') du mouvement du poinçon, - des troisièmes moyens (14) destinés à comparer les signaux issus des différents dispositifs (8) de mesure entre eux et à mettre en oeuvre - des quatrièmes moyens (15) destinés à commander les moyens de déplacement (5) de façon à obtenir un angle de pliage constant sur toute la longueur de la pièce à plier. 1. Press for folding sheets comprising an upper apron (1) and a lower apron (2), one of the aprons supporting a punch (3), press comprising two actuation means (17, 17 ') of the movement of the punch and at least one displacement means (5) intended to remedy the drawbacks inherent in the bending process, characterized in that it comprises a bending device intended for continuous control of the bending angle of the sheet and comprising: a) two pairs of measuring bars (6, 6 '), located opposite the amounts of the press (18, 18'), and at least one pair of measuring bars (16, 16 ') located opposite the means displacement (5), the measuring bars (6, 6 ', and 16, 16') being of round section, truncated longitudinally so as to present a flat surface (7) intended to serve as a support for one of the surfaces of the sheet to be folded, each of the measuring bars being arranged so as to be able to rotate during the folding of the sheet, each of the pairs of measuring bars being associated with a device (8) for measuring the angle of rotation of the measure bars, b) a control device (9) connected to the measuring devices (8), to the actuation means (17, 17 ') of the movement of the punch (3) and to the displacement means (5) and comprising: - first means (12) intended to compare with the imposed value the signals given by the measuring devices (8), - second means (13,13 ') intended to control the actuation means (17,17') of the movement of the punch, - third means (14) intended to compare the signals from the various measuring devices (8) with one another and to be implemented - fourth means (15) intended to control the displacement means (5) so as to obtain a constant folding angle over the entire length of the part to be folded. 2. Presse selon la revendication 1, caractérisée en ce qu'elle comporte une pluralité de moyens de déplacement (5), répartis le long de la presse, et en ce que le dispositif de contrôle de l'angle de pliage comporte une pluralité de couples de barres de mesure (16, 16') associées à une pluralité de dispositifs (8) de mesure, le nombre des couples de barres de mesure (16, 16') étant égal au nombre des moyens de déplacement (5), en ce que les moyens (13, 13') permettent de commander individuellement les moyens d'actionnement (17, 17') du mouvement du poinçon, et en ce que le dispositif de commande (9) est agencé de façon à mettre en oeuvre les moyens de commande (15) des moyens de déplacement (5) en tenant compte de l'interaction de ces moyens de déplacement.2. Press according to claim 1, characterized in that it comprises a plurality of displacement means (5), distributed along the press, and in that the device for controlling the folding angle comprises a plurality of pairs of measuring bars (16, 16 ') associated with a plurality of measuring devices (8), the number of pairs of measuring bars (16, 16') being equal to the number of displacement means (5), that the means (13, 13 ') make it possible to individually control the actuation means (17, 17') of the movement of the punch, and in that the control device (9) is arranged so as to implement the control means (15) of the displacement means (5) taking into account the interaction of these displacement means. 3. Presse selon l'une des revendications 1 ou 2, caractérisée en ce que les dispositifs (8) de mesure sont agencés de façon à mesurer la rotation absolue de chacune des barres (6, 6' ou 16, 16'), les valeurs obtenues pour la rotation de chacune des deux barres étant ensuite additionnées par le dispositif de commande (9), de façon à déterminer l'angle de pliage local instantané de la pièce à plier.3. Press according to one of claims 1 or 2, characterized in that the measuring devices (8) are arranged so as to measure the absolute rotation of each of the bars (6, 6 'or 16, 16'), the values obtained for the rotation of each of the two bars then being added by the control device (9), so as to determine the instantaneous local bending angle of the part to be bent. 4. Presse selon l'une des revendications 1 à 3, un des tabliers supportant un poinçon (3), caractérisée en ce que les barres de mesure (6, 6' et 16, 16') sont disposées dans un logement aménagé dans l'autre tablier.4. Press according to one of claims 1 to 3, one of the aprons supporting a punch (3), characterized in that the measuring bars (6, 6 'and 16, 16') are arranged in a housing arranged in the other apron. 5. Presse selon l'une des revendications 1 à 3, un des tabliers supportant un poinçon (3), caractérisée en ce que l'autre tablier supporte un porte-outil (4) et en ce que les barres de mesure (6, 6' et 16, 16') sont disposées dans un logement aménagé dans ledit porte-outil.5. Press according to one of claims 1 to 3, one of the aprons supporting a punch (3), characterized in that the other apron supports a tool holder (4) and in that the measuring bars (6, 6 'and 16, 16') are arranged in a housing arranged in said tool holder. 6. Presse selon l'une des revendications précédentes, caractérisée en ce que l'un au moins des tabliers comporte une fente dans laquelle sont aménagés les moyens de déplacement (5).6. Press according to one of the preceding claims, characterized in that at least one of the aprons has a slot in which the displacement means (5) are arranged. 7. Presse selon l'une des revendications 1 à 5, caractérisée en ce que les moyens de déplacement (5) sont situés à l'intérieur d'une fente aménagée dans le tablier inférieur et en ce que lesdits moyens de déplacement sont agencés de façon à exercer une poussée sur la face supérieure de la fente en s'appuyant sur au moins deux plaques latérales disposées parallèles au tablier inférieur.7. Press according to one of claims 1 to 5, characterized in that the displacement means (5) are located inside a slot in the lower apron and in that said displacement means are arranged so as to exert a thrust on the upper face of the slot by pressing on at least two side plates arranged parallel to the lower deck. 8. Presse selon l'une des revendications 1 à 5, caractérisée en ce que le tablier inférieur comporte une première partie constituée d'au moins un tablier porteur et une deuxième partie constituée d'au moins un tablier flexible supporté par les moyens de déplacement (5) et supportant.le dispositif de pliage.8. Press according to one of claims 1 to 5, characterized in that the lower apron comprises a first part consisting of at least one load-bearing apron and a second part consisting of at least one flexible apron supported by the displacement means (5) and supporting the folding device. 9. Presse selon l'une des revendications 7 ou 8, caractérisée en ce que des moyens de déplacement (5) sont situés à l'intérieur d'une fente aménagée dans le tablier supérieur.9. Press according to one of claims 7 or 8, characterized in that displacement means (5) are located inside a slot in the upper deck. 10. Procédé de mise en action de la presse selon l'une des revendications 1 à 9, caractérisé en ce que l'on mesure de façon continue l'angle de pliage de la tôle en une pluralité d'endroits répartis le long de la tôle, en ce que l'on compare ces valeurs entre elles et que l'on agit sur la tôle de façon ponctuelle, de manière à obtenir un angle de pliage constant sur toute la longueur de la pièce, et en ce que l'on compare la valeur de l'angle de pliage obtenu avec la valeur de l'angle de pliage imposé et que l'on continue le pliage en répétant le processus jusqu'à l'obtention de l'angle de pliage imposé.10. Method for actuating the press according to one of claims 1 to 9, characterized in that the bending angle of the sheet is continuously measured in a plurality of places distributed along the sheet, in that we compare these values with each other and that we act on the sheet in a punctual manner, so as to obtain a constant bending angle over the entire length of the part, and in that we compare the value of the folding angle obtained with the value of the imposed folding angle and that the folding is continued by repeating the process until the imposed folding angle is obtained. 11. Procédé selon la revendication 10, caractérisé en ce que l'on commande la décharge de l'effort appliqué sur le poinçon lorsque l'angle de pliage imposé est atteint, en ce que l'on poursuit la mesure continue de l'angle de pliage de façon à déterminer la variation de l'angle de pliage due à la détente de la tôle et en ce que l'on reprend le processus de pliage après modification de l'angle de pliage à atteindre de façon à tenir compte de la nouvelle détente prévue de la tôle, le processus se répétant jusqu'à obtention, après détente de la tôle, de l'angle de pliage imposé.11. Method according to claim 10, characterized in that one controls the discharge of the force applied to the punch when the imposed folding angle is reached, in that one continues the continuous measurement of the angle bending so as to determine the variation in the bending angle due to the relaxation of the sheet and in that the bending process is resumed after modification of the bending angle to be reached so as to take account of the new planned relaxation of the sheet, the process repeating until the sheet bending angle obtained is obtained. 12. Procédé selon l'une des revendications 10 ou 11, caractérisé en ce que toutes les opérations sont effectuées automatiquement, après que l'opérateur a imposé l'angle de pliage.12. Method according to one of claims 10 or 11, characterized in that all the operations are carried out automatically, after the operator has imposed the folding angle.
EP85810020A 1984-02-03 1985-01-22 Plate bending machine with a device for controlling the bending angle Withdrawn EP0155228A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH504/84A CH654761A5 (en) 1984-02-03 1984-02-03 BENDING PRESS FOR WHICH THE FOLDING DEVICE ENABLES CONTINUOUS CONTROL OF THE FOLDING ANGLE OF THE WORKPIECE.
CH504/84 1984-02-03

Publications (1)

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EP0155228A1 true EP0155228A1 (en) 1985-09-18

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EP85810020A Withdrawn EP0155228A1 (en) 1984-02-03 1985-01-22 Plate bending machine with a device for controlling the bending angle

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US (1) US4640113A (en)
EP (1) EP0155228A1 (en)
JP (1) JPS60180622A (en)
CH (1) CH654761A5 (en)

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DE9213532U1 (en) * 1992-10-07 1993-01-28 Haberstock, Rolf, 7897 Küssaberg Bending device for bending sheet metal parts
GB2226515B (en) * 1988-12-29 1993-06-02 Amada Co Ltd Sheet workpiece bending machine
US5295384A (en) * 1990-03-15 1994-03-22 Lift Verkaufsgerate Gesellschaft M.B.H. Sheet-metal bending device
EP0594532A1 (en) * 1992-10-20 1994-04-27 Beyeler Machines S.A. Device for measuring the angle of bend of a sheet
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GB2226515B (en) * 1988-12-29 1993-06-02 Amada Co Ltd Sheet workpiece bending machine
US5295384A (en) * 1990-03-15 1994-03-22 Lift Verkaufsgerate Gesellschaft M.B.H. Sheet-metal bending device
DE9213532U1 (en) * 1992-10-07 1993-01-28 Haberstock, Rolf, 7897 Küssaberg Bending device for bending sheet metal parts
EP0594532A1 (en) * 1992-10-20 1994-04-27 Beyeler Machines S.A. Device for measuring the angle of bend of a sheet
US5375340A (en) * 1992-10-20 1994-12-27 Beyeler Raskin S.A. Measuring device for the bend angle of sheet-metal
US5515706A (en) * 1994-08-22 1996-05-14 Paul; David R. Angle bender & method
EP0940196A1 (en) * 1996-10-29 1999-09-08 Komatsu Ltd. Bending angle correction method and press brake made using the same
EP0940196A4 (en) * 1996-10-29 2000-03-01 Komatsu Mfg Co Ltd Bending angle correction method and press brake made using the same
NL1004820C2 (en) * 1996-12-18 1997-12-23 Delem B V Control of bending press e.g. for sheet metal
WO1998056518A1 (en) * 1997-06-13 1998-12-17 Luciano Gasparini Device to automatically adapt the bending pressure, proportionally to the working pressure of the cylinders of the upper cross-piece, particularly in a press-bending machine and a machine so obtained

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US4640113A (en) 1987-02-03
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