EP1452302B1 - Process for correcting a bending operation and press brake - Google Patents
Process for correcting a bending operation and press brake Download PDFInfo
- Publication number
- EP1452302B1 EP1452302B1 EP03405126A EP03405126A EP1452302B1 EP 1452302 B1 EP1452302 B1 EP 1452302B1 EP 03405126 A EP03405126 A EP 03405126A EP 03405126 A EP03405126 A EP 03405126A EP 1452302 B1 EP1452302 B1 EP 1452302B1
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- EP
- European Patent Office
- Prior art keywords
- piece
- side frames
- bottom dead
- dead centre
- length
- 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
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005452 bending Methods 0.000 title claims description 32
- 238000012937 correction Methods 0.000 claims description 40
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 230000035515 penetration Effects 0.000 claims description 4
- 230000000284 resting effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 11
- 240000008042 Zea mays Species 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 230000003042 antagnostic effect Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241001080024 Telles Species 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
- B30B15/245—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam using auxiliary cylinder and piston means as actuating members
-
- 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 lower apron 2 of the press shown on the Figure 1A comprises three reaction holes 13, 13 ', 13'', passing right through the plates 3, 4 and 7.
- Each reaction hole accommodates a compensation hydraulic cylinder 14, 14', 14 '', which rests on the reaction plates 4 and 7 and whose piston 11 supports from below at 12 on the central plate 3, as schematically illustrates the Figure 1B , to provide a compensation thrust to the upper part of the central plate 3 of the lower deck, so as to compensate for the deformation mentioned above.
- the reaction plates 4 and 7 undergo a reaction downwards.
- the action of the hydraulic compensating cylinders 14, 14 ', 14 is controlled, as is that of the pistons and working rolls 6 and 6' by an electronic control unit (not shown in the drawing). On long presses, the number of reaction holes equipped with compensation rolls is higher.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
La présente invention concerne un procédé de correction d'une opération de pliage effectuée par une presse-plieuse du type comprenant un tablier fixe, un tablier mobile, des moyens de déplacement du tablier mobile s'appuyant sur deux montants solidaires du tablier fixe, des capteurs, associés respectivement aux deux montants, mesurant les forces exercées par lesdits moyens de déplacement sur lesdits montants, des vérins de compensation de déformation associés à l'un des deux tabliers, et un dispositif électronique de commande commandant le déplacement du tablier mobile entre un point mort haut et un point mort bas.The present invention relates to a method of correcting a folding operation carried out by a press brake of the type comprising a fixed deck, a movable deck, means for moving the movable deck resting on two integral uprights of the fixed deck, sensors, respectively associated with the two uprights, measuring the forces exerted by said moving means on said uprights, deformation compensation cylinders associated with one of the two aprons, and an electronic control device controlling the movement of the moving apron between a top dead center and bottom dead center.
L'invention concerne également une presse-plieuse de ce type.The invention also relates to a press brake of this type.
Le brevet
Le document
La mise en oeuvre d'un tel procédé de correction dans une telle presse permet de diminuer sensiblement la différence d'angle de pliage entre le milieu et les extrémités de pièces longues. Par contre, les deux tabliers et les outils étant certes parallèles, mais présentant une flèche, cette flèche est transmise à la pièce à plier, de sorte que son arête n'est plus parfaitement droite, mais se courbe. Le procédé est mal adapté au pliage de pièces courtes, c'est-à-dire de pièces dont la longueur est très inférieure à la distance entre les montants.The implementation of such a correction method in such a press substantially reduces the difference in bending angle between the medium and the ends of long pieces. On the other hand, the two aprons and the tools being certainly parallel, but presenting an arrow, this arrow is transmitted to the part to be folded, so that its edge is not perfectly straight, but curves. The method is poorly suited to folding short parts, that is to say parts whose length is much less than the distance between the amounts.
Le document
Le but de l'invention est donc de proposer un procédé de correction d'opération(s) de pliage simple et efficace, qui puisse être automatiquement mis en oeuvre par la commande numérique d'une presse équipée d'une seule rangée de vérins de compensation.The object of the invention is therefore to propose a method for correcting simple and effective folding operation (s), which can be automatically implemented by the numerical control of a press equipped with a single row of jacks. compensation.
Ce but est atteint en mettant en oeuvre, dans une presse-plieuse du type défini d'entrée, un procédé comprenant le pré-enregistrement d'un abaque d'étalonnage en mémoire du dispositif électronique de commande, au moyen de pièces d'étalonnage très courtes, ledit abaque établissant une correspondance entre les forces mesurées par les capteurs associés aux montants et les pressions applicables aux vérins de compensation du tablier les portant, pour maintenir ledit tablier sensiblement droit, et dans lequel procédé, pendant une opération de pliage subséquente, on applique auxdits vérins de compensation des pressions résultant dudit abaque, en fonction des forces mesurées au niveau desdits capteurs.This object is achieved by implementing, in a press brake of the defined input type, a method comprising the pre-registration of a calibration chart in memory of the electronic control device, by means of parts. very short calibration, said abacus establishing a correspondence between the forces measured by the sensors associated with the uprights and the pressures applicable to the compensating jacks of the deck carrying them, to maintain said deck substantially straight, and in which process, during an operation of subsequent folding, applying to said compensation cylinders pressures resulting from said chart, according to the measured forces at said sensors.
De préférence, à la compensation de la déformation des tabliers au moyen des vérins de compensation, le procédé de correction selon l'invention ajoute une correction de la profondeur de pénétration du poinçon dans la matrice, en recalculant le point mort bas en fonction des caractéristiques de la pièce à plier et des valeurs mesurées par les capteurs associés aux montants.Preferably, to compensate for the deformation of the aprons by means of the compensation cylinders, the correction method according to the invention adds a correction of the penetration depth of the punch into the matrix, by recalculating the bottom dead center according to the characteristics the piece to bend and values measured by the sensors associated with the uprights.
La méthode de calcul de la correction du point mort bas prend de préférence en compte le fait que la pièce à plier est une pièce longue ou une pièce courte. Par pièce "longue", il faut entendre une pièce dont la longueur est sensiblement égale à la distance entre les deux montants de la presse. Par pièce "courte", il faut entendre une pièce dont la longueur ne dépasse pas un tiers de la distance entre les deux montants.The method of calculating the bottom dead center correction preferably takes into account the fact that the piece to be bent is a long piece or a short piece. By "long" part, is meant a piece whose length is substantially equal to the distance between the two amounts of the press. "Short" coin means a coin whose length does not exceed one third of the distance between the two uprights.
Pour une pièce courte, la correction du point mort bas ΔZ peut être calculée à partir de la formule
- F est la charge locale sur la pièce courte (en Newton)
- l est la distance entre les montants
- la et lb sont les distances respectives du centre de la pièce aux montants
- E est le module d'élasticité du tablier supérieur (en N/mm2)
- I est le moment d'inertie axiale du tablier (en mm4)
- F is the local load on the short coin (in Newton)
- l is the distance between the amounts
- l a and l b are the respective distances from the center of the room to the uprights
- E is the modulus of elasticity of the upper deck (in N / mm 2 )
- I is the axial moment of inertia of the deck (in mm 4 )
La déformation Δf du tablier qui ne comporte pas de vérins de compensation augmente pendant la phase de déformation élastique de la pièce pliée mais varie peu pendant la phase de déformation plastique.The deformation Δf of the deck which does not include compensating jacks increases during the phase of elastic deformation of the folded part but varies little during the phase of plastic deformation.
Le point mort bas est corrigé de la valeur de la déformation maximale Δfmax du tablier.The bottom dead center is corrected by the value of the maximum deformation Δf max of the deck.
Pour une pièce longue, on peut appliquer une correction du point mort bas à la course du tablier mobile calculée par la formule
Si la longueur exacte de la pièce à plier est connue, le type de correction du point mort bas peut être choisi par l'opérateur de la machine, et la valeur de la longueur de la pièce entrée en mémoire de l'électronique de commande. Si la longueur de la pièce n'est pas parfaitement connue, notamment si elle varie d'une pièce à l'autre d'une série, elle peut être déterminée en cours d'opération, par référence à une première opération de pliage de référence, et la correction sera déterminée automatiquement par l'électronique de commande.If the exact length of the part to be bent is known, the type of correction of the bottom dead center can be chosen by the operator of the machine, and the value of the length of the part entered into memory of the control electronics. If the length of the part is not perfectly known, especially if it varies from one part to the other of a series, it can be determined during operation, with reference to a first reference bending operation. , and the correction will be determined automatically by the control electronics.
D'autres particularités et avantages de l'invention apparaîtront à l'homme du métier de la description ci-dessous d'un mode d'exécution de l'invention, en se référant aux figures, dans lesquelles :
- La
Fig. 1A est une vue schématique en perspective d'une presse hydraulique, montrant l'action de vérins hydrauliques de compensation sur le tablier inférieur; - La
Fig. 1B est une vue schématique en coupe transversale du tablier inférieur de la presse de lafigure 1A ;
- The
Fig. 1A is a schematic perspective view of a hydraulic press, showing the action of hydraulic compensating cylinders on the lower deck; - The
Fig. 1B is a schematic cross-sectional view of the lower apron of the press of theFigure 1A ;
Les
- La
Fig. 2a est une représentation du pliage d'une pièce longue; - La
Fig. 2b est une représentation du pliage d'une pièce courte centrée par rapport aux montants de la presse; - La
Fig. 2c est une représentation du pliage d'une pièce courte, décentrée par rapport aux montants de la presse.
- The
Fig. 2a is a representation of the folding of a long piece; - The
Fig. 2b is a representation of the folding of a short piece centered with respect to the amounts of the press; - The
Fig. 2c is a representation of the bending of a short piece, off-center with respect to the amounts of the press.
Les
- La
Fig. 3a est une représentation d'un pliage d'une pièce longue; - La
Fig. 3b est une représentation d'un pliage d'une pièce très courte; - La
Fig. 3c est une représentation d'un pliage d'une pièce courte.
- The
Fig. 3a is a representation of a folding of a long piece; - The
Fig. 3b is a representation of a folding of a very short piece; - The
Fig. 3c is a representation of a folding of a short piece.
Les
- La
Fig. 4a est une représentation d'un pliage d'une pièce longue; - La
Fig. 4b est une représentation d'un pliage d'une pièce très courte centrée; - La
Fig. 4c est une représentation d'un pliage d'une pièce courte centrée. - La
Fig. 5b est une représentation d'un pliage d'une pièce très courte décentrée. - La
Fig. 5c est une représentation d'un pliage d'une pièce courte décentrée.
- The
Fig. 4a is a representation of a folding of a long piece; - The
Fig. 4b is a representation of a fold of a very short centered coin; - The
Fig. 4c is a representation of a folding of a short centered coin. - The
Fig. 5b is a representation of a folding of a very short piece off center. - The
Fig. 5c is a representation of a folding of a short piece off center.
Les
La
Comme le montrent les
Le tablier inférieur 2 de la presse représentée sur la
L'invention s'applique aussi bien à ce type de machines présentant plusieurs trous de réaction qu'à celles ayant une seule fente de compensation, décrites par exemple dans
Dans le cas hypothétique où le centre de la pièce à plier serait pratiquement sous le montant a, Fa vaudrait pratiquement 100 % de F, et Fb ≃ 0.In the hypothetical case where the center of the piece to be bent is substantially in the amount, F would be nearly 100% of F, and F b ≃ 0.
Dans le cas illustré par la
Dans une première étape de procédé, on procède à un étalonnage valable pour une paire de tabliers, une paire de porte-outils et d'outils. L'opération d'étalonnage est effectuée à l'aide de pièces d'étalonnage de très courtes longueurs, c'est-à-dire dont la longueur est inférieure à 10 % de la longueur entre deux vérins, placées en plusieurs positions successives entre les deux montants. La pièce très courte est mise sous pression entre les deux tabliers et, pour une succession de valeurs de Fa et de Fb selon la/lb, on ajuste les vérins du tablier inférieur de telle façon à ce que son arête supérieure soit droite. L'ensemble des valeurs de Fa, Fb et des valeurs des pressions des vérins de compensation ainsi mesurées constitue un abaque d'étalonnage, qui est préenregistré dans la mémoire du dispositif électronique de commande.In a first process step, a valid calibration is performed for a pair of aprons, a pair of tool holders and tools. The calibration operation is performed using calibration pieces of very short lengths, that is to say the length of which is less than 10% of the length between two jacks, placed in several successive positions between both amounts. The very short piece is pressurized between the two aprons and, for a succession of values of F a and F b according to l a / l b , the cylinders of the lower deck are adjusted so that its upper edge is right. The set of values of F a , F b and the values of the pressures of the compensation cylinders thus measured constitutes a calibration chart, which is pre-recorded in the memory of the electronic control device.
Lors d'une opération de pliage réelle d'une pièce de longueur relativement courte par rapport à la distance l entre les deux montants, les capteurs des deux montants mesurent en cours de pliage des forces Fa et Fb et le dispositif électronique de commande actionne les vérins de compensation de manière que leurs pressions correspondent aux valeurs correspondantes de l'abaque.During an actual folding operation of a piece of relatively short length relative to the distance between the two uprights, the sensors of the two uprights measure during the folding of the forces F a and F b and the electronic control device actuates the compensation cylinders so that their pressures correspond to the corresponding values of the chart.
L'homme du métier comprendra aisément qu'en actionnant les vérins de compensation de la manière sus-indiquée, le tablier inférieur reste sensiblement droit pendant l'opération de pliage de pièces de courtes longueurs, mais présente une certaine courbure résiduelle lors du pliage de pièces longues.Those skilled in the art will readily understand that by actuating the compensation cylinders in the manner indicated above, the lower deck remains substantially straight during the folding operation of short length pieces, but has a certain residual curvature during the folding of long pieces.
Comme on peut le voir sur la
Dans laquelle E est le module d'élasticité (en Nn/mm2) du tablier supérieur et I désigne le moment d'inertie axiale (en mm4) du tablier; les valeurs de E et de I sont déterminées lors de la fabrication du tablier et sont enregistrées dans la mémoire de l'électronique de commande.In which E is the modulus of elasticity (in Nn / mm 2 ) of the upper deck and I denotes the axial moment of inertia (in mm 4 ) of the deck; the values of E and I are determined during the manufacture of the apron and are stored in the memory of the control electronics.
Dans le cas où la pièce est centrée dans la presse, cette formule se simplifie en :
La
Après calcul de la déformation Δfmax du tablier supérieur, la profondeur de pénétration de l'outil dans la matrice est corrigée en corrigeant la position du point mort bas d'une quantité correspondant à la déformation maximale.After calculating the deformation Δf max of the upper deck, the depth of penetration of the tool into the matrix is corrected by correcting the position of the bottom dead center by an amount corresponding to the maximum deformation.
Lorsque les capteurs de force ont détecté une position excentrée de la pièce, telle que l'illustre la
En variante, les corrections de ΔZ peuvent être entièrement déterminées à l'aide d'abaques numérisés, préenregistrés dans la mémoire du dispositif électronique de commande : pour chaque angle de pliage de consignes et pour chaque rapport la/lb, l'abaque contient des corrections des valeurs ΔZ pour chaque montant, valeurs qui peuvent varier de quelques centièmes de millimètres jusqu'à environ 2 mm. Les valeurs des corrections ΔZ appliquées aux deux montants sont pré-calculées à l'aide de formules telles que les formules ci-dessus. Les valeurs des corrections applicables sont choisies par le dispositif électronique de commande à partir des valeurs captées par les capteurs de pression associés à chacun des deux montants. Cette méthode présente l'avantage d'être beaucoup plus rapide à mettre en oeuvre pendant une opération de pliage que si le système électronique devait recalculer les corrections ΔZ en temps réel.As a variant, the corrections of ΔZ can be entirely determined by means of digitized abacuses, prerecorded in the memory of the electronic control device: for each angle of bending of instructions and for each ratio l a / l b , the abacus contains corrections of the ΔZ values for each amount, values that can vary from a few hundredths of a millimeter up to about 2 mm. The values of the ΔZ corrections applied to the two amounts are pre-calculated using formulas such as the formulas above. The values of the applicable corrections are chosen by the electronic control device from the values sensed by the pressure sensors associated with each of the two uprights. This method has the advantage of being much faster to implement during a folding operation than if the electronic system had to recalculate ΔZ corrections in real time.
Les
- Les
Figs 3a, 3b et 3c illustrent des pliages sans aucune compensation de la flexion des tabliers :- La
Fig. 3a montre le pliage d'une pièce dont la longueur est environ égale à celle de la presse plieuse : l'angle de pliage au milieu de la pièce est supérieur à l'angle de pliage aux deux extrémités. - La
Fig. 3b montre le pliage d'une pièce très courte : l'angle est beaucoup plus ouvert que l'angle de consigne, à cause de la déformation quasi triangulaire des montants supérieur et inférieur. - La
Fig. 3c montre le pliage d'une pièce dont la longueur est environ le tiers de la longueur de la machine : l'angle de pliage est relativement constant sur la longueur de la pièce, mais il est nettement plus ouvert que l'angle de consigne.
- La
- Les
Figs 4a, 4b, 4c ainsi que 5b et 5c illustrent des pliages dans lesquels seule la flexion des tabliers est compensée de telle façon à ce que ces tabliers restent parallèles lors du pliage d'une pièce longue :- La
Fig. 4a représente le pliage d'une pièce longue : l'angle est constant sur toute la longueur de la pièce et il est égal à la valeur de consigne; - La
Fig. 4b représente le pliage d'une pièce très courte centrée : l'angle est nettement plus ouvert que l'angle estimé à cause de la déformation quasi triangulaire du tablier supérieur. - La
Fig. 5b représente le pliage de la même pièce, mais excentrée : l'angle de pliage est également plus ouvert que la valeur de consigne, mais de plus, sa valeur est variable en fonction de la position de la pièce sur la machine, de sorte qu'une correction de cet angle peut difficilement être effectuée de manière reproductible. - La
Fig. 4c représente le pliage d'une pièce courte, dont la longueur est environ le tiers de la longueur de la machine : l'angle est relativement constant le long de la pièce, mais plus ouvert que la valeur de consigne; - La
Fig. 5c illustre le pliage de la même pièce fortement excentrée : l'angle de pliage n'est pas constant, il est plus ouvert que la valeur de consigne et des corrections sont très difficiles à estimer.
- La
- Les
Figs 6a à 7c illustrent des pliages dans lesquels une correction des points morts bas des montants du tablier supérieur est superposée à une compensation de la flexion du tablier inférieur :- La
Fig. 6a montre le pliage d'une pièce longue : l'angle est constant sur toute la longueur de la pièce et égal à la valeur de consigne. - La
Fig. 6b montre le pliage d'une pièce très courte centrée : les deux points morts bas des deux extrémités du tablier supérieur sont corrigés de la déformation quasi triangulaire de celui-ci et la valeur de l'angle de pliage est correcte. - La
Fig. 7b montre le pliage de la même pièce excentrée : les deux points morts bas des deux extrémités du tablier supérieur ont subi deux corrections différentes adaptées pour corriger la déformation triangulaire asymétrique de ce tablier et l'angle de pliage de la pièce très courte est correct. - La
Fig. 6c montre le pliage d'une pièce dont la longueur est environ le tiers de la longueur de la machine, centrée : les deux points morts bas des deux extrémités du tablier supérieur ont reçu la même correction et l'angle de pliage présente une valeur sensiblement constante sur la longueur de la pièce et égale à la valeur de consigne. - La
Fig. 7c illustre le pliage de la même pièce excentrée dans la machine : les deux points morts bas des extrémités du tablier supérieur ont reçu des corrections différentes et adaptées, de sorte que l'angle de pliage est approximativement constant sur la longueur de la pièce et égal à la valeur de consigne.
- La
- The
Figs 3a, 3b and 3c illustrate bends without any compensation for the bending of the aprons:- The
Fig. 3a shows the folding of a piece whose length is approximately equal to that of the press brake: the bending angle in the middle of the piece is greater than the bending angle at both ends. - The
Fig. 3b shows the folding of a very short piece: the angle is much more open than the setpoint angle, because of the quasi-triangular deformation of the upper and lower uprights. - The
Fig. 3c shows the folding of a piece whose length is about one third of the length of the machine: the bending angle is relatively constant over the length of the piece, but it is much more open than the set angle.
- The
- The
Figs 4a, 4b, 4c as well as 5b and 5c illustrate folds in which only the bending of the aprons is compensated in such a way that these aprons remain parallel during the folding of a long piece:- The
Fig. 4a represents the folding of a long piece: the angle is constant over the entire length of the piece and it is equal to the set value; - The
Fig. 4b represents the folding of a very short piece centered: the angle is much more open than the estimated angle because of the quasi-triangular deformation of the upper deck. - The
Fig. 5b represents the bending of the same piece, but eccentric: the bending angle is also more open than the set value, but moreover, its value is variable depending on the position of the piece on the machine, so that a correction of this angle can hardly be performed in a reproducible manner. - The
Fig. 4c represents the folding of a short piece, whose length is about one third of the length of the machine: the angle is relatively constant along the part, but more open than the set value; - The
Fig. 5c illustrates the folding of the same piece strongly eccentric: the bending angle is not constant, it is more open than the set value and corrections are very difficult to estimate.
- The
- The
Figs 6a to 7c illustrate bends in which a correction of the lower dead spots of the upper deck uprights is superimposed on a compensation of the bending of the lower deck:- The
Fig. 6a shows the bending of a long piece: the angle is constant over the entire length of the piece and equal to the set value. - The
Fig. 6b shows the folding of a very short piece centered: the two bottom dead spots of the two ends of the upper deck are corrected for the quasi-triangular deformation thereof and the value of the folding angle is correct. - The
Fig. 7b shows the folding of the same eccentric part: the two bottom dead spots of the two ends of the upper deck have undergone two different corrections adapted to correct the asymmetrical triangular deformation of this deck and the angle of folding of the very short piece is correct. - The
Fig. 6c shows the folding of a piece whose length is about one-third of the length of the machine, centered: the two bottom dead spots at both ends of the machine upper deck have received the same correction and the bending angle has a value substantially constant over the length of the room and equal to the set value. - The
Fig. 7c illustrates the folding of the same eccentric part in the machine: the two bottom dead spots of the ends of the upper deck have received different and adapted corrections, so that the bending angle is approximately constant over the length of the piece and equal to the set value.
- The
Plusieurs autres phénomènes peuvent nécessiter des corrections du point mort bas de la machine, corrections qui s'ajoutent à la correction due aux déformations du tablier décrites ci-dessus.Several other phenomena may require corrections of the bottom dead center of the machine, corrections which are added to the correction due to the deformations of the deck described above.
Ainsi, lors du pliage d'une tôle, la force subie par les montants sous l'effet de la poussée des vérins provoque une flexion de ces montants, qui peut se traduire par une déformation du cadre de l'ordre de 1 à 2 mm, ce qui modifie la profondeur de pénétration du poinçon dans la matrice. Plusieurs méthodes de correction de la déformation des montants sont connues dans l'état de la technique. On peut, par exemple, utiliser celle décrite dans le brevet
Un autre paramètre susceptible d'engendrer une erreur de l'angle de pliage est la variabilité de l'épaisseur des pièces traitées. En effet, les tôles d'acier fournies par les fabricants peuvent présenter des variations d'épaisseurs allant jusqu'à ± 10 % de la valeur nominale. Une opération de pliage précise doit prendre en compte la différence entre l'épaisseur réelle de la pièce et l'épaisseur nominale. Plusieurs procédés ont été proposés pour ce faire dans l'état de la technique. On peut, par exemple, utiliser celui décrit dans le
Un autre problème qui se pose lors d'un processus de pliage est la compensation de l'effet de ressort, c'est-à-dire le retour élastique de la pièce pliée à un angle de pliage légèrement inférieur, lorsque la pression du poinçon est relâchée. A cause de cet effet, la valeur maximale de l'angle instantané de pliage sous charge doit être supérieure à la valeur de consigne de l'angle de pliage désiré, après relâchement de la pièce pliée. Plusieurs procédés de correction de l'effet de retour élastique ont été proposés dans l'état de la technique. On peut, par exemple, utiliser les procédés proposés par les
On peut également calculer la compensation de l'effet de ressort sans faire une modélisation éventuellement inadéquate en utilisant le procédé proposé par le déposant dans sa demande de brevet no PCT/
On peut enfin opérer une correction pour tenir compte des variations de longueur des pièces à plier et, pour ce faire, on peut d'abord procéder à une opération de pliage d'étalonnage avec une pièce dont la longueur exacte est connue, tout en mesurant l'épaisseur réelle, comme indiqué ci-dessus. Pendant l'opération de pliage d'étalonnage, pour un angle donné, par exemple 150°, on mesure la force pressante nécessaire à ce pliage. La longueur exacte de cette pièce étant connue, l'unité de commande peut calculer la force par unité de longueur, par exemple en T/m. Pour les pliages subséquents de la série, la force pressante est mesurée à ce même angle, par exemple 150°, et cette force est comparée à celle enregistrée lors de la première opération d'étalonnage. La longueur réelle des pièces successives peut alors être déterminée en appliquant une simple règle de proportionnalité, avec une approximation de ± 10 mm, ce qui est suffisant en pratique.Finally, a correction can be made to take account of variations in the length of the pieces to be folded, and to do this, a calibration folding operation can first be carried out with a piece whose exact length is known, while measuring the actual thickness, as indicated above. During the calibration folding operation, for a given angle, for example 150 °, the pressing force necessary for this folding is measured. Since the exact length of this part is known, the control unit can calculate the force per unit length, for example in T / m. For subsequent bends of the series, the pressing force is measured at the same angle, for example 150 °, and this force is compared with that recorded during the first calibration operation. The actual length of the successive pieces can then be determined by applying a simple rule of proportionality, with an approximation of ± 10 mm, which is sufficient in practice.
Selon une autre variante, on peut déterminer la longueur réelle de la pièce en admettant que la résistance à la rupture par traction est constante et correspond à la valeur nominale. La longueur de la pièce peut se déduire de la relation
- e désigne l'épaisseur mesurée
- γ la résistance à la rupture par traction
- V est l'angle d'ouverture
- F est la force en tonnes
- L est la longueur de la pièce
- e is the measured thickness
- γ tensile strength
- V is the opening angle
- F is the force in tons
- L is the length of the piece
L'ensemble des corrections précitées permet de recalculer le point mort bas de la course du tablier supérieur pendant qu'une opération de pliage est en cours.All the aforementioned corrections recalculate the bottom dead center of the upper deck stroke while a folding operation is in progress.
Claims (9)
- A method of correcting a bending operation performed by a press brake (1) of the type comprising a fixed beam (2), a movable beam (5), displacement means (6, 6') for displacing the movable beam resting on two side frames (10, 10') integral with the fixed beam (2), sensors, associated respectively with the two side frames (10, 10'), measuring the forces exerted by the said displacement means (6, 6') on the said side frames (10, 10'), deformation compensation cylinders (14, 14', 14'') associated with one of the two beams, and an electronic control device controlling the displacement of the movable beam (5) between a top dead centre and a bottom dead centre, characterised in that a calibration nomogram is pre-recorded in the memory of the electronic control device using very short calibration pieces, i.e. the length of which is less than 10% of the length between two cylinders, the said nomogram establishing a correspondence between the forces measured by the sensors associated with the side frames (10, 10') and the pressures that can be applied to said compensation cylinders (14, 14', 14'') of the beam carrying them, in order to keep the said beam substantially straight, and in that, during a subsequent bending operation, pressures resulting from the said nomogram are applied to the said compensation cylinders (14, 14', 14''), according to the forces measured at the said sensors.
- Method according to claim 1, characterised in that a correction to the depth of penetration of the punch into the die is made by recalculating the bottom dead centre of each side frames according to the characteristics of the piece to be bent and the values measured by the sensors associated with the side frames.
- Method according to claim 2, applied to a short piece to be bent, characterised in that a correction to the bottom dead centre (ΔZ) is calculated by means of the formula
in which:F is the local load on the short piece (in newtons)l is the distance between the side framesla and lb are the respective distances from the centre of the piece to the side framesE is the modulus of elasticity of the top beam (in N/mm2)I is axial moment of inertia of the beam (in mm4) - Method according to claim 2, applied to a long piece to be bent, characterised in that a correction ΔZ' to the bottom dead centre is applied to the travel of the movable beam calculated by means of the formula
in which:Q designates the load per unit length on the piece (in N/m)E is the modulus of elasticity of the top beam (in N/mm2)I is the axial moment of inertia of the beam (in mm4) - Method according to one of claims 2 to 4, characterised in that the actual length of the piece is determined by comparing the force measured by the said force sensors with the corresponding data of a reference bending operation.
- Method according to one of claims 2 to 5, characterised in that the corrections to the bottom dead centres of the movable beam are predetermined according to the length of the piece and the forces measured by the said force sensors, and pre-recorded in the memory of the said electronic control device.
- Method according to one of claims 2 to 6, characterised in that an additional correction to the bottom dead centre is calculated after determination of the actual thickness of the piece to be bent.
- Method according to any one of claims 2 to 7, characterised in that an additional correction to the bottom dead centre is calculated in order to compensate for the spring effect.
- Press brake (1) comprising a fixed beam (2), a movable beam (5), displacement means (6, 6') for displacing the movable beam resting on two side frames (10, 10') integral with the fixed beam (2), sensors, associated respectively with the two side frames, measuring the forces exerted by the said displacement means (6, 6') on the said side frames (10, 10'), deformation compensation cylinders (14, 14', 14'') associated with the bottom beam (2), and an electronic control device controlling the displacement of the movable beam (5) between a top dead centre and a bottom dead centre, characterised in that the said electronic control device is programmed to implement a method according to one of claims 1 to 8.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60327042T DE60327042D1 (en) | 2003-02-26 | 2003-02-26 | Method for correcting a bending process and bending press |
EP03405126A EP1452302B1 (en) | 2003-02-26 | 2003-02-26 | Process for correcting a bending operation and press brake |
AT03405126T ATE427830T1 (en) | 2003-02-26 | 2003-02-26 | METHOD FOR CORRECTING A BENDING PROCESS AND BENDING PRESS |
CNA2004800089255A CN1767940A (en) | 2003-02-26 | 2004-02-19 | Method for correcting a folding operation and folding press |
CA002516998A CA2516998A1 (en) | 2003-02-26 | 2004-02-19 | Method for correcting a folding operation and folding press |
PCT/CH2004/000090 WO2004076161A1 (en) | 2003-02-26 | 2004-02-19 | Method for correcting a folding operation and folding press |
US10/546,909 US7503200B2 (en) | 2003-02-26 | 2004-02-19 | Method for correcting a folding operation and folding press |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03405126A EP1452302B1 (en) | 2003-02-26 | 2003-02-26 | Process for correcting a bending operation and press brake |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1452302A1 EP1452302A1 (en) | 2004-09-01 |
EP1452302B1 true EP1452302B1 (en) | 2009-04-08 |
Family
ID=32749031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03405126A Expired - Lifetime EP1452302B1 (en) | 2003-02-26 | 2003-02-26 | Process for correcting a bending operation and press brake |
Country Status (7)
Country | Link |
---|---|
US (1) | US7503200B2 (en) |
EP (1) | EP1452302B1 (en) |
CN (1) | CN1767940A (en) |
AT (1) | ATE427830T1 (en) |
CA (1) | CA2516998A1 (en) |
DE (1) | DE60327042D1 (en) |
WO (1) | WO2004076161A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022006613A1 (en) | 2020-07-09 | 2022-01-13 | Trumpf Maschinen Austria Gmbh & Co. Kg. | Bending device with a deformation compensation function |
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AT501264B8 (en) * | 2004-09-10 | 2007-02-15 | Trumpf Maschinen Austria Gmbh | METHOD FOR PRODUCING A WORKING PART THROUGH BENDING FORMING |
FR2877863B1 (en) * | 2004-11-12 | 2007-02-09 | Kazuhisa Oguchi | PRESS BRAKE WITH 3 SUPPORT POINTS |
ITMI20062026A1 (en) * | 2006-10-23 | 2008-04-24 | Antonio Maria Banfi | PROCEDURE AND DEVICE TO COMPENSATE THE STRUCTURAL DEFORMATIONS OF A FOLDING PRESS |
FR2942980B1 (en) * | 2009-03-13 | 2011-04-08 | Amada Europ | PRESS BRAKE FOR FOLDING SHEETS |
FR2942981B1 (en) * | 2009-03-13 | 2011-04-08 | Amada Europe | PRESS BRAKE FOR FOLDING SHEETS |
FR2942982B1 (en) * | 2009-03-13 | 2014-12-05 | Amada Europ | PRESS BRAKE FOR FOLDING SHEETS |
FR2942983B1 (en) * | 2009-03-13 | 2011-04-08 | Amada Europ | PRESS BRAKE FOR FOLDING SHEETS |
GB201114438D0 (en) * | 2011-08-22 | 2011-10-05 | Airbus Operations Ltd | A method of manufacturing an elongate component |
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. |
ITTV20120125A1 (en) * | 2012-07-06 | 2014-01-07 | Gasparini Ind S R L | DEVICE FOR BENDING IN FOLDING PRESSES. |
AT513150B1 (en) * | 2012-12-06 | 2014-02-15 | Trumpf Maschinen Austria Gmbh | press brake |
JP2015051453A (en) * | 2013-09-09 | 2015-03-19 | 蛇の目ミシン工業株式会社 | Electric press, inflection point detection method and program |
JP6257970B2 (en) * | 2013-09-09 | 2018-01-10 | 蛇の目ミシン工業株式会社 | Electric press, bending point detection method and program |
JP6257971B2 (en) * | 2013-09-09 | 2018-01-10 | 蛇の目ミシン工業株式会社 | Electric press, judgment method and program |
DE102013110539B3 (en) | 2013-09-24 | 2014-11-20 | Fette Compacting Gmbh | Process for producing a compact of powdery material |
AT515153B1 (en) * | 2013-12-04 | 2015-08-15 | Trumpf Maschinen Austria Gmbh | bending machine |
CN106424229A (en) * | 2016-11-23 | 2017-02-22 | 南通新通威机床有限公司 | Structure optimization and rigidity compensation method for ultra-large bending machine |
US10369613B2 (en) * | 2017-02-06 | 2019-08-06 | GM Global Technology Operations LLC | Die assembly for a stamping press |
CN106955912A (en) * | 2017-04-28 | 2017-07-18 | 上海葛世工业自动化有限公司 | Automatic degree of disturbing compensation device and bender |
CN106890871B (en) * | 2017-04-28 | 2019-01-11 | 山东嘉意机械有限公司 | Stand stretch compensation device and bending machine |
JP6638022B2 (en) * | 2018-05-28 | 2020-01-29 | 株式会社アマダホールディングス | Press brake control device, press brake control method, and mold |
CN110961496B (en) * | 2019-11-22 | 2021-07-20 | 天水锻压机床(集团)有限公司 | Intelligent compensation system and compensation method for bending high-hardness plate based on high-precision numerical control cantilever forming machine |
WO2022146266A1 (en) * | 2020-12-31 | 2022-07-07 | Baykal Maki̇na Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ | Gas propellant top beam structure in press brakes |
EP4074432A1 (en) * | 2021-04-15 | 2022-10-19 | Bystronic Laser AG | Bending machine for bending workpieces, in particular bending press |
CN114653790A (en) * | 2022-05-26 | 2022-06-24 | 中国二十二冶集团有限公司 | Correcting device for DC arc furnace heavy current reflux bus flexible connection busbar |
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US4408471A (en) * | 1980-10-29 | 1983-10-11 | Massachusetts Institute Of Technology | Press brake having spring-back compensating adaptive control |
CH653289A5 (en) | 1982-11-03 | 1985-12-31 | Beyeler Machines Sa | Hydraulic press including a stationary apron and a movable apron |
CH680773A5 (en) | 1989-09-11 | 1992-11-13 | Beyeler Machines Sa | |
CH686119A5 (en) * | 1991-10-31 | 1996-01-15 | Beyeler Raskin Sa | Method of adjustment of the slide stroke of a press brake and press brake with a tuning device for the implementation of the Method. |
IT1250562B (en) * | 1991-12-30 | 1995-04-20 | Prima Ind Spa | PRECISION BENDING PRESS FOR RELATIVELY SHORT SHEET PIECES. |
WO1996001706A1 (en) * | 1994-07-08 | 1996-01-25 | Amada Company, Limited | Method for bending with press brake and press brake for use therein |
IT1295498B1 (en) * | 1997-10-17 | 1999-05-12 | Luciano Gasparini | DEVICE FOR DETECTING THE BENDING OF THE LOWER AND UPPER CROSSBARS, AIMED AT INTERACTION WITH AT LEAST ONE |
FI105366B (en) * | 1997-10-29 | 2000-07-31 | Nokia Networks Oy | Linearization procedure and amplifier arrangement |
FR2782942B1 (en) * | 1998-09-09 | 2000-12-01 | Amada Europ Sa | ACTIVE LOWER APRON BENDING PRESS |
DE60019544T2 (en) * | 2000-01-24 | 2006-02-23 | Bystronic Laser Ag | Method for controlling the stroke of a bending press |
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 |
-
2003
- 2003-02-26 EP EP03405126A patent/EP1452302B1/en not_active Expired - Lifetime
- 2003-02-26 DE DE60327042T patent/DE60327042D1/en not_active Expired - Lifetime
- 2003-02-26 AT AT03405126T patent/ATE427830T1/en active
-
2004
- 2004-02-19 CA CA002516998A patent/CA2516998A1/en not_active Abandoned
- 2004-02-19 US US10/546,909 patent/US7503200B2/en not_active Expired - Lifetime
- 2004-02-19 CN CNA2004800089255A patent/CN1767940A/en active Pending
- 2004-02-19 WO PCT/CH2004/000090 patent/WO2004076161A1/en active Application Filing
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022006613A1 (en) | 2020-07-09 | 2022-01-13 | Trumpf Maschinen Austria Gmbh & Co. Kg. | Bending device with a deformation compensation function |
Also Published As
Publication number | Publication date |
---|---|
US20070033981A1 (en) | 2007-02-15 |
WO2004076161A1 (en) | 2004-09-10 |
DE60327042D1 (en) | 2009-05-20 |
CN1767940A (en) | 2006-05-03 |
ATE427830T1 (en) | 2009-04-15 |
US7503200B2 (en) | 2009-03-17 |
CA2516998A1 (en) | 2004-09-10 |
EP1452302A1 (en) | 2004-09-01 |
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