EP2682198B1 - Dispositif de cambrage dans des presses à plier - Google Patents

Dispositif de cambrage dans des presses à plier Download PDF

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Publication number
EP2682198B1
EP2682198B1 EP13163686.2A EP13163686A EP2682198B1 EP 2682198 B1 EP2682198 B1 EP 2682198B1 EP 13163686 A EP13163686 A EP 13163686A EP 2682198 B1 EP2682198 B1 EP 2682198B1
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EP
European Patent Office
Prior art keywords
valve
cambering
oil
accumulator
lower beam
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EP13163686.2A
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German (de)
English (en)
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EP2682198A1 (fr
Inventor
Augusto Zanini
Stefano Bizzotto
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Gasparini Industries Srl
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Gasparini Industries Srl
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0272—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
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection

Definitions

  • the present invention relates to an active cambering device of bending presses.
  • Document US 3 914 975 A discloses an active cambering device for a bending press comprising an upper beam and a lower beam, the active cambering device making use of an hydraulic mechanism.
  • a cambering circuit which comprises a high- capacity pump, in which the deformation of the jacks is controlled by a proportional pressure valve that performs this control by operating on the pressure of the circuit.
  • the aim of the present invention is therefore to solve the above technical problems, eliminating the drawbacks of the cited background art, by providing a device that makes it possible to achieve higher energy savings.
  • an object of the invention is to provide a device that allows activating the press in very short times by supplying, in a set pressure range, large instantaneous oil flows.
  • Another object of the invention is to allow the use of only the amount of oil that is necessary, avoiding discharging the pressurized excess uselessly.
  • Another object of the invention is to allow having a lower installed power.
  • Another object of the invention is to allow achieving a higher reaction speed of the cambering, reducing the cycle time and increasing productivity.
  • Another object is to obtain a device that is structurally simple, has low manufacturing costs and can be provided with usual known plants.
  • an active cambering device of bending presses comprising an upper beam and a lower beam, characterized in that it comprises a pump adapted to load at least one accumulator, said accumulator being adapted to actuate said lower beam by means of a proportional direction valve.
  • the reference numeral 1 designates an active cambering device of bending presses comprising an upper beam 2 and a lower beam 3.
  • the device comprises a pump 4, P1 adapted to load at least one accumulator 5, ACC, said accumulator being adapted to actuate said lower beam 3 by means of a proportional direction valve 6, V8.
  • the position of the slider of the proportional direction valve 6, V8 is continuous and proportional to the current that flows through the coils/solenoids installed therein; in the specific case, the proportional direction valve 6, V8 has three possible positions between which the slider can move, affecting them both partially and completely.
  • V8A There is a second position, designated by V8A, with crossed centers, in which the branch P is connected to the branch B; in this condition the oil flows toward the cambering jacks 7 of the lower beam 3; the branch T is also connected to the branch A; in this condition, since A is plugged, nothing happens.
  • V8B There is a third position, designated by V8B, with straight centers: the branch P is thus connected to the branch A (and since A is plugged, nothing happens) and the branch T is connected to the branch B: in this case the oil that arrives from the cambering jacks 7 is discharged.
  • the pump 4, P1 is activated at power-on of the machine or press: in this step a motor 8, M is switched on which, by rotating the pump 4, P1, starts to make the oil circulate in the circuit.
  • the oil flows through a first valve 9, V5, which is a one-way valve for protecting the pump 4, P1; it is a one-way valve that prevents the flow of the oil toward the pump 4, P1 whereas it allows its flow toward the user device.
  • V5 is a one-way valve for protecting the pump 4, P1; it is a one-way valve that prevents the flow of the oil toward the pump 4, P1 whereas it allows its flow toward the user device.
  • the circuit is not pressurized, because the fluid is discharged through a first electric valve 10, V1 that is in the inactive position.
  • the first electric valve 10, V1 in the inactive position discharges the circuit onto the tank 11, whereas in the position V1A it prevents the passage of the oil toward the tank 11, i.e., it acts as a plug.
  • V1 In order to pressurize the circuit, all the drains to the tank 11 must be closed, and therefore the first electric valve 10, V1 is energized and reaches the position V1A and, if there is a safety block 12 for accumulators 5, ACC, as shown in Figure 2 , a second electric valve 13, V2 also is energized which in turn reaches the position V2A.
  • V8 is in the inactive position with the centers closed, i.e., with P, T, A and B plugged; the oil cannot pass through it and therefore the part of the circuit that is upstream thereof is pressurized.
  • T1 When a pressure transducer 16, T1 sends the signal that the reference pressure (target) has been reached, the first electric valve 10, V1 is deactivated and the oil resumes flowing through it from the pump 4, P to the tank 11.
  • the bending cycle can begin; initially there is a quick descent of the upper beam 2 and then the step of approach to the metal plate to be bent (not shown) at the working speed begins.
  • the pump 4, P1 is inserted in the circuit again by activation of the first electric valve 10, V1, moving it to the position V1A.
  • the bending step begins and therefore following, deformation and cambering in position occur.
  • the main cylinders 17a, 17b of the press push downward in order to reach the levels YY1 and YY2 that will allow reaching the target angle of the plate being bent.
  • the upper beam 2 is deformed; the numeric control or computer 18, CNC begins comparing the values of the deformation of the upper beam 2 with those of the lower beam 3, measured respectively by adapted position transducers 19, UT and 20, LT, and operates accordingly; its purpose is to render the deflection of the lower beam 3 equal to the deflection of the upper beam 2.
  • the cambering jacks 17a, 17b must be opened more or less according to need; the 'more or less' is obtained by operating on the proportional direction valve 6, V8, moving its slider continuously and proportionally to the supply current of the coils between the positions V8A and V8B.
  • the numeric control or computer 18, CNC operates therefore in the following manner: if the level QUT detected by the transducer 19, UT on the upper beam 2 is higher than the level QLT detected by the transducer 20, LT on the lower beam 3, the slider of the proportional direction valve 6, V8 is induced to move toward the position V8A and the deformation of the lower beam 3 is increased.
  • the relaxation step begins, in which the pressure in the main cylinders 17a, 17b is decreased and the structure relaxes.
  • the upper beam 2 returns to the horizontal and therefore, since cambering is still active, the lower beam 3, which continues to follow its deflection, also returns to the horizontal, discharging the excess oil from the cambering jacks 7.
  • V2 in circuits with accumulators 5, ACC of a capacity greater than one liter, and therefore with a safety block 12 certified according to the mandatory standards of the country of destination, once the machine or press has been powered on, the second electric valve 13, V2 remains always active (discharge closed) so that the oil cannot be discharged into the tank 11; it can be deactivated at the end of the day.
  • the maximum pressure in the circuit is determined first by the third safety valve 21, V4 and then by the fourth safety valve 22, V7 and the fifth safety valve 23, V9.
  • the proportional direction valve 6, V8 does not determine the pressure of the circuit, but merely passes either toward the cambering or toward the discharge quantities of oil that are proportional to the current that flows through the coils that move its slider.
  • the first electric valve 10, V1 and the third electric valve 15, V3 are fundamentally on/off - open/closed valves; the third electric valve 15, V3 actually always lets the oil flow 'upward from below', whereas it behaves as on-off only downward from above.
  • the invention fully achieves the intended aim and objects cited above, more energy being saved than in the illustrated background art; the device allows moving small volumes of oil, but when it intervenes these volumes are supplied in very short times; there are, therefore, high flow-rates of oil and therefore many liters/minute.
  • the use of the accumulator allows using a pump having a small capacity, despite supplying, in the set pressure range, high immediate flow-rates of oil.
  • the device allows having the quantity of oil necessary only when it is needed, without draining it uselessly.
  • the device allows instead a position control by means of a proportional direction valve and therefore one drains and then produces the laminar flow of a quantity of oil that is positively lower than before, thus saving more energy.
  • the main purpose of the pump 4 is to charge the accumulator 5, ACC during idle times, whereas the supply of the cambering jacks 7 is provided almost exclusively by the latter.

Landscapes

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

Claims (10)

  1. Dispositif de cambrage actif (1) pour presses à plier comprenant une poutre supérieure (2) et une poutre inférieure (3), caractérisé en ce qu'il comprend une pompe (4, P1), au moins un accumulateur (5, ACC) et une soupape de direction proportionnelle (6, V8), la pompe (4, P1) étant adaptée pour charger l'au moins un accumulateur (5, ACC), ledit accumulateur (5, ACC) étant adapté pour actionner ladite poutre inférieure (3) au moyen de la soupape de direction proportionnelle (6, V8).
  2. Dispositif selon la revendication 1, caractérisé en ce que ladite soupape de direction proportionnelle (6, V8) a un positionnement du coulisseau qui est continu et proportionnel au courant qui traverse les bobines/solénoïdes installés à l'intérieur, ladite soupape de direction proportionnelle (6, V8) ayant trois positions possibles, entre lesquelles ledit coulisseau peut se déplacer, les affectant partiellement et complètement ; une première position inactive avec centres fermés, dans laquelle il n'y a pas de liaison entre les différentes branches, branche sous pression (P), d'évacuation (T), d'utilisation (A) et (B) qui arrivent à/sortent de ladite soupape de direction proportionnelle (6, V8), qui se comporte comme un bouchon, empêchant le passage de l'huile dans toute direction ; une deuxième position (V8A) avec centres croisés, dans laquelle ladite branche sous pression (P) est reliée à ladite branche (B) de sorte que dans cet état l'huile s'écoule vers les vérins de cambrage (7) de ladite poutre inférieure (3) et ladite branche d'évacuation (T) est également reliée à la branche d'utilisation (A), qui est bouchée ; une troisième position (V8B) avec lesdits centres en direct, de façon à relier ladite branche sous pression (P) à ladite branche bouchée (A), et ladite branche d'évacuation (T) à ladite branche d'utilisation (B) de façon à évacuer l'huile qui arrive desdits vérins de cambrage (7).
  3. Procédé de cambrage actif de presses à plier comprenant une poutre supérieure (2) et une poutre inférieure (3) utilisant un dispositif de cambrage actif selon la revendication 1, caractérisé en ce qu'une fois que tous les drains à un réservoir (11) sont fermés, afin de mettre le circuit sous pression, une première soupape électrique (10, V1) est mise sous tension et atteint la position (V1A) et, si un bloc de sécurité (12) pour au moins un accumulateur (5, ACC) est prévu, une deuxième soupape électrique (13, V2) est également mise sous tension et atteint à son tour la position (V2A), une soupape de direction proportionnelle (6, V8) étant prévue dans la position inactive avec les branches (P, T, A, B) fermées, permettant la mise sous pression de la partie du circuit qui est en amont de celles-ci, réalisant également le chargement dudit au moins un accumulateur (5, ACC) depuis une première soupape (9, V5) et une deuxième soupape (14, V5) et une troisième soupape électrique (15, V3), les deux premières étant des soupapes unidirectionnelles simples et la dernière étant un clapet anti-retour dans la position inactive, empêchent l'écoulement de l'huile seulement vers le bas, de sorte qu'une fois que le circuit est mis sous pression, ledit au moins un accumulateur (5, ACC) commence à se charger.
  4. Procédé selon la revendication 3, caractérisé en ce que lorsqu'un transducteur de pression (16, T1) envoie le signal que la pression de référence, cible, a été atteinte, ladite première soupape électrique (10, V1) est désactivée et l'huile se remet à s'écouler à travers celle-ci d'une pompe (4, P) audit réservoir (11), la configuration de ladite troisième soupape électrique (15, V3) lorsqu'elle est inactive permettant audit au moins un accumulateur (5, ACC) de rester sous pression.
  5. Procédé selon la revendication 3, dans lequel, une fois que l'étape préparatoire pour l'allumage de ladite presse à plier est terminée, le cycle de pliage commence avec une descente rapide initiale de ladite poutre supérieure (2) et ensuite une étape d'approche de la plaque de métal à plier à la vitesse de travail, caractérisé en ce que peu avant que ladite plaque de métal à plier interagisse avec ladite poutre inférieure (3), ladite pompe (4, P1) est insérée dans le circuit à nouveau par activation de ladite première soupape électrique (10, V1), la déplaçant jusqu'à la position (V1A) de sorte qu'une situation d'équilibre est atteinte en termes de pressions entre les branches en amont et en aval de ladite troisième soupape électrique (15, V3), qui peut donc être dans la position (V3A) de sorte que l'huile qui est présente dans ledit au moins un accumulateur (5, ACC) peut s'écouler dans le circuit.
  6. Procédé selon une ou plusieurs des revendications 3 à 5, caractérisé en ce qu'au début de l'étape de pliage, des vérins principaux (17a, 17b) de ladite poutre supérieure (2) exercent une pression vers le bas afin d'atteindre des hauteurs préréglées (YY1) et (YY2) qui sont adaptées pour permettre d'atteindre l'angle cible de la plaque pliée à mesure que cette étape progresse, ladite poutre supérieure (2) étant déformée pendant qu'une commande numérique ou ordinateur (18, CNC) commence à comparer les valeurs de la déformation de ladite poutre supérieure (2) avec celles de ladite poutre inférieure (3), mesurées respectivement par des transducteurs de position adaptés (19, UT ; 20, LT) dans cette étape ouvrant partiellement ou entièrement lesdits vérins de cambrage (17a, 17b) par action sur ladite soupape de direction proportionnelle (6, V8), déplaçant son coulisseau de manière continue et proportionnelle au courant d'alimentation des bobines, entre les positions (V8A) et (V8B) de sorte que la déflection de ladite poutre inférieure (3) correspond à la déflection de ladite poutre supérieure (2).
  7. Procédé selon une ou plusieurs des revendications 3 à 6, caractérisé en ce que par déplacement vers ladite position (V8A), l'huile s'écoule vers lesdits vérins de cambrage (17a, 17b), les mettant sous pression et les ouvrant, alors que par déplacement vers ladite position (V8B), le cambrage est dépressurisé et par conséquent la déformation de ladite poutre inférieure (3) est réduite, ladite commande numérique ou ordinateur (18, CNC) fonctionnant de sorte que si le niveau (QOT) détecté par ledit transducteur (19, UT) sur ladite poutre supérieure (2) est supérieur au niveau (QLT) détecté par ledit transducteur (20, LT) sur ladite poutre inférieure (3), le coulisseau de ladite soupape de direction proportionnelle (6, V8) est amené à se déplacer vers ladite position (V8A) et la déformation de ladite poutre inférieure (3) est augmentée ; si par contre QUT < QLT, le coulisseau de ladite soupape de direction proportionnelle (6, V8) est amené à se déplacer vers ladite position (V8B) et la déformation de ladite poutre inférieure (3) est diminuée ; si QUT = QLT, le coulisseau de ladite soupape de direction proportionnelle (6, V8) est amené à se déplacer vers la position inactive et la déformation de ladite poutre inférieure (3) est maintenue constante.
  8. Procédé selon une ou plusieurs des revendications 3 à 7, caractérisé en ce qu'à mesure que les deux déflexions s'approchent l'une de l'autre, ladite soupape de direction proportionnelle (6, V8) s'approche de la position de fermeture centrale, alors qu'à mesure que la demande d'huile diminue, l'excès d'huile recharge ledit au moins un accumulateur (5, ACC).
  9. Procédé selon une ou plusieurs des revendications 3 à 8, caractérisé en ce qu'une fois que lesdits vérins principaux (17a, 17b) de ladite presse à plier ont atteint lesdits niveaux YY1 et YY2 et les valeurs des déflexions desdites deux poutres, la poutre inférieure (3) et la poutre supérieure (2), sont identiques, la partie a été pliée et l'étape de détente commence, dans ladite étape la pression dans lesdits vérins principaux (17a, 17b) diminuant et ladite poutre supérieure (2) et ladite poutre inférieure (3) revenant à l'horizontal, évacuant l'excès d'huile desdits vérins de cambrage (7).
  10. Procédé selon une ou plusieurs des revendications 3 à 9, caractérisé en ce que la pression maximum dans le circuit est déterminée par une quatrième soupape de sécurité (21, V4), par une cinquième soupape (22, V7) et par une sixième soupape de sécurité (23, V9), ladite soupape de direction proportionnelle (6, V8) faisant simplement passer soit vers le cambrage soit vers l'évacuation des quantités d'huile qui sont proportionnelles au courant qui traverse les bobines qui déplacent son coulisseau.
EP13163686.2A 2012-07-06 2013-04-15 Dispositif de cambrage dans des presses à plier Active EP2682198B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000125A ITTV20120125A1 (it) 2012-07-06 2012-07-06 Dispositivo per la bombatura in presse piegatrici.

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EP2682198A1 EP2682198A1 (fr) 2014-01-08
EP2682198B1 true EP2682198B1 (fr) 2018-06-20

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914975A (en) 1970-12-25 1975-10-28 Amada Co Ltd Hydraulic press brake
EP0540476A1 (fr) 1991-10-31 1993-05-05 Beyeler Raskin S.A. Procédé de réglage de la course du coulisseau d'une presse-plieuse et presse-plieuse comportant un dispositif de réglage pour la mise en oeuvre du procédé
JPH05329549A (ja) 1992-06-03 1993-12-14 Amada Co Ltd 折曲げ加工機の加工制御装置
JPH10211522A (ja) 1997-01-27 1998-08-11 Amada Eng Center:Kk 曲げ加工機におけるテーブルのたわみ補正方法及びその装置
EP1027178B1 (fr) 1997-10-17 2002-01-30 Luciano Gasparini Presse a cintrer avec dispositif pour detecter la flexion de traverses inferieures et superieures afin d'interagir avec au moins un systeme de bombage
WO2002074463A1 (fr) 2001-03-16 2002-09-26 Bystronic Laser Ag Procede de reglage de la course d'une presse-plieuse
US6812693B2 (en) 2001-11-09 2004-11-02 Wabco Gmbh & Co. Ohg Inductive displacement sensor with volume occupying winding

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE427830T1 (de) * 2003-02-26 2009-04-15 Bystronic Laser Ag Verfahren zur korrigierung eines biegvorgangs und biegepresse
ITMI20062026A1 (it) * 2006-10-23 2008-04-24 Antonio Maria Banfi Procedimento e dispositivo per compensare le deformazioni strutturali di una pressa piegatrice

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914975A (en) 1970-12-25 1975-10-28 Amada Co Ltd Hydraulic press brake
EP0540476A1 (fr) 1991-10-31 1993-05-05 Beyeler Raskin S.A. Procédé de réglage de la course du coulisseau d'une presse-plieuse et presse-plieuse comportant un dispositif de réglage pour la mise en oeuvre du procédé
JPH05329549A (ja) 1992-06-03 1993-12-14 Amada Co Ltd 折曲げ加工機の加工制御装置
JPH10211522A (ja) 1997-01-27 1998-08-11 Amada Eng Center:Kk 曲げ加工機におけるテーブルのたわみ補正方法及びその装置
EP1027178B1 (fr) 1997-10-17 2002-01-30 Luciano Gasparini Presse a cintrer avec dispositif pour detecter la flexion de traverses inferieures et superieures afin d'interagir avec au moins un systeme de bombage
WO2002074463A1 (fr) 2001-03-16 2002-09-26 Bystronic Laser Ag Procede de reglage de la course d'une presse-plieuse
US6812693B2 (en) 2001-11-09 2004-11-02 Wabco Gmbh & Co. Ohg Inductive displacement sensor with volume occupying winding

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HOLGER WATTER: "Hydraulik und Pneumatik", 2007, VIEWEG+TEUBNER, ISBN: 978-3-8348-0539-3, article "Speicher", pages: 147 - 149, XP055578939

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Publication number Publication date
ITTV20120125A1 (it) 2014-01-07
EP2682198A1 (fr) 2014-01-08

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