EP0370956B1 - Procédé et dispositif de pliage de pièces en tôle - Google Patents

Procédé et dispositif de pliage de pièces en tôle Download PDF

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Publication number
EP0370956B1
EP0370956B1 EP89810882A EP89810882A EP0370956B1 EP 0370956 B1 EP0370956 B1 EP 0370956B1 EP 89810882 A EP89810882 A EP 89810882A EP 89810882 A EP89810882 A EP 89810882A EP 0370956 B1 EP0370956 B1 EP 0370956B1
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EP
European Patent Office
Prior art keywords
die
bending
punch
cylinder units
metal piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89810882A
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German (de)
English (en)
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EP0370956A3 (fr
EP0370956A2 (fr
Inventor
Eduard Hänni
Vaclav Zbornik
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.)
Haemmerle AG Maschinenfabrik
Original Assignee
Haemmerle AG Maschinenfabrik
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Publication date
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Publication of EP0370956A2 publication Critical patent/EP0370956A2/fr
Publication of EP0370956A3 publication Critical patent/EP0370956A3/fr
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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
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • B21D5/0236—Tool clamping

Definitions

  • the present invention relates to a method for bending sheet metal pieces with a bending punch and a bending die, to the use of a device for bending sheet metal pieces and to an apparatus for carrying out the method.
  • press brakes For bending sheet metal pieces, press brakes are used, which have a movable bending punch and a bending die arranged in a die holder, the high working pressures that occur necessitate a heavy type of press brake.
  • deflection of the machining tools as a result of deflection of the press frame cannot be prevented.
  • deflections naturally impair the accuracy of the bending process and efforts have been made to prevent or compensate for the possible deflections.
  • a proposal by the applicant was for the use of a work table, the table top of which rests on a support element corresponding to its length, which is vertically displaceable in a base part and is supported on an oil cushion.
  • a further completion of such a press brake was to place the die holder on a number of pistons lined up side by side Arranged cylinder units. If the workpiece to be machined is shorter than the available length of the work table, the workpiece is pressed too hard at the ends and there are inaccuracies.
  • a press brake allows a more precise processing, in which the elastically resiliently supported tool itself or its support is formed from a number of sub-elements which are arranged next to one another independently of one another and are vertically displaceable. Under the load, only those sub-elements are shifted against the elastic base on which the workpiece rests directly or indirectly. With such a press brake, it is advantageous if the die holder rests on a number of piston-cylinder units lined up next to one another, while the bending die is provided with an adjustable base, so that any angle can be set by the base adjustment.
  • such a device has a die with a groove, which is equipped with movable pins.
  • the lower end faces of the pins rest on the surface of a wedge which is movably mounted. When the wedge was moved, the pins were raised and lowered.
  • a press brake is designed in such a way that the lower or upper tool is separated from the pistons of several vertical hydraulic support cylinder distributed over the length of the press brake is supported. These are interconnected to form a self-contained hydraulic system.
  • a particular advantage of the proposed method is that even extremely narrow sheet metal strips can be processed with great precision without one-sided displacements or unstabilities occurring.
  • the piece of sheet metal is pressed against the die bottom continuously and with constant pressure. In this way, a constant bending angle is ensured over the entire bending length, regardless of whether the sheet length corresponds to the length of the bending punch, is shorter than the bending punch or is significantly shorter than the bending punch.
  • the pressure of the corresponding piston-cylinder units is only varied to compensate for local irregularities in the sheet metal properties or in the mechanical and strength properties of the sheet metal piece.
  • the die base in the region of the piston-cylinder units lying on the left and right is increased by the sheet thickness, provided that these piston-cylinder units arranged on both sides are outside the area of the sheet-metal piece.
  • the corresponding segments of the bending die i.e. those segments that lie in the area of the two piston-cylinder units on the right and left, can be reduced by the sheet thickness, provided the sheet piece is narrow and in the area of the there is no sheet metal in the outermost piston-cylinder units.
  • the air gap is bridged at both ends of the punch between the punch and the bending die, once by the increase the bottom of the bending die and, alternatively, by lowering the corresponding segments of the punch, so that the high forces occurring during bending cannot cause instability.
  • the remaining units which are also outside the area of the sheet metal piece, are relieved.
  • a folding press designated 1 in FIG. 1 is used to carry out the proposed method, which has a hydraulically actuated ram 2 which is provided with a bending punch 3.
  • the bending punch 3 is in one piece or composed of individual segments 4.
  • a length adjustment of the stamp 3 is made possible by adding or omitting segments 4.
  • the bending die 3 interacts with a bending die 5, which is arranged in a die holder 6 and has a height-adjustable bottom, also consisting of individual segments, which is then described and explained in more detail in connection with FIG. 4.
  • the die including die holder 6 is supported by the pistons of a number of piston-cylinder units 7 lined up next to one another, which can be actuated individually or together, as will be described later.
  • Air bending force is the force that is required to deform the sheet metal piece, which initially lies flat on the die 5 and is pressed into the die 5.
  • This air bending force is the pressing pressure required to deform the sheet metal piece 8, namely until the sheet metal piece touches the bottom of the die 5. After the bending edge lies on the base of the die, this provides resistance, which leads to an increase in the pressure.
  • the height-adjustable bottom of the bending die is set beforehand in accordance with the bending angle, this setting being able to be carried out in a known manner by means of adjustable wedges.
  • the sheet metal piece 8 is significantly narrower than the bending die 3 and the bending die 5, an unstable state arises when the bending edge of the sheet metal piece 8 strikes the bottom of the bending die 5, since an air gap remains outside the area of the sheet metal piece 8 and no resistance to the punch 3 is opposed.
  • the air gap is bridged by stops.
  • the bottom of the die 5 is increased at both ends at 5 'by the sheet thickness h.
  • the bottom of the die is increased at both ends of the die 5 by separate wedges, not shown, which can be actuated by an adjusting spindle.
  • the spindles are expediently driven by a motor and precisely adjusted. This arrangement will be explained in more detail later.
  • the piston-cylinder units which are outside the area of the sheet metal pieces, are relieved after the end of the air bending.
  • FIG. 2 Another possibility is shown in FIG. 2.
  • the die is designated by 5 and the die holder by 6.
  • the procedure is exactly the same as that described with reference to FIG. 1, with the difference that the two outer segments 4a and 4b of the Stamp 3 are extended by the sheet thickness h down.
  • FIG. 3 Another possibility is shown in FIG. 3.
  • a stop 9 in the form of a threaded spindle is arranged on the ram 2 of the press brake on both ends thereof on the right and left, which are adjustable in a holder 10 fastened to the ram 2.
  • a counter stop 10 ' is laterally movably arranged synchronously with the die bottom on the die holder 6. With these counter stops 10 ', the threaded spindles work together as stops 9, which are set so that an air gap 11' remains at both ends of the punch 3, the height of which corresponds to the sheet thickness h.
  • FIG. 4 shows a device which is particularly suitable for carrying out the described method, the design of the die and the die holder and a piston-cylinder unit being shown in more detail.
  • a number of piston-cylinder units are arranged, which are arranged closely next to each other and each have a cylinder 12 with stepped pistons 13, 14.
  • the piston part 13 is guided in the usual way in the cylinder 12, while the piston part 14, whose diameter is smaller than that of the piston part 13, is arranged in a cover 15, which cover is ring-shaped and is provided with sealing rings 16.
  • the cover 15 also has a ring extension 17 pointing downward, which extends into the interior of the cylinder 12 and with its end face 17 ′ forms a stop for the top dead center position of the piston part 13.
  • the lower stroke limitation is the corresponding surface 11a of the support plate 11. In this way, a piston stroke H remains.
  • a pressure channel 18 is provided in the stationary support plate 11 and is connected to a pressure source.
  • Another pressure line 19 leads from the channel 18 into a three-way valve 20, which connects the line 19 with a line 21 in one position and the line 21 with a return channel 24 in the other position.
  • the line 21 leads into the space 23 below the piston part 13, while the line 22 is a return line to the return channel 24.
  • a common plate 25 is provided, which rests on the various piston-cylinder units arranged next to one another, specifically on the facing surfaces 14 ′ of the piston parts 14, and serves to receive the die holder 26.
  • the die 27 is arranged, which is provided with an adjustable die bottom 28.
  • the die base 28 expediently consists of pin-shaped inserts 29 which are received in bores in the die holder and protrude into the cutout 27 ′ of the die 27 at the top. With their lower end they rest on the surface of a carrier 30, which can be adjusted in height with the aid of a wedge 31.
  • Spindles 32 with regulating members 33 are used for wedge adjustment.
  • the die 27 together with the wedge adjustment is accommodated on or in the die holder 26, which is fastened on the continuous table top 25 by means of clamping members 34.
  • the die holder 26 can be horizontal Plane displaceable and adjustable, so that the die 27 can be moved relative to the plunger 2, not shown in this FIG. 4, by moving the die holder 26.
  • a spindle (not shown in detail) can be provided for the displacement.
  • the proposed method can be carried out in a simple manner.
  • the three-way valve 20 connects the pressure line 19 to the line 21, which opens into the space 23.
  • the stepped piston 13, 14 is in the upper end position, as can be seen in FIG. 4.
  • the shoulder 13 'of the piston part 13 will abut against the end face 17' of the extension 17.
  • the pressure acting on the stepped piston 13, 14 in the space 23 is somewhat greater than the air bending force required for bending, so that the stepped piston 13, 14 remains in the illustrated top dead center position during air bending.
  • the stepped pistons 13, 14 which are below the sheet metal piece to be bent are pushed back. If the sheet metal piece to be bent is shorter than the die, the stabilization measures mentioned take effect at both ends of the die.
  • the two ends of the bending punch, not shown, abut corresponding stops which are arranged for compensation. Either parts of the die base 28 are raised at the corresponding points or segments of the ram are lowered. In this way, the thickness of the sheet metal piece is compensated so that the entire press brake remains stable.
  • the remaining step pistons 13, 14, which are not under the sheet, are relieved.
  • step pistons 13, 14 it is also possible for the step pistons 13, 14 to be in the bottom dead center position without pressure in the starting position.
  • the bending of the sheet metal piece is carried out with the bending punch, the plunger being stopped before reaching the die bottom 28.
  • the pistons 13, 14 are then pressurized so that they press the entire die 27 together with the adjustable die bottom 28 against the die with constant pressure Press the piece of sheet metal, whereupon there is a uniform deformation along the bending edge of the stamp.
  • the die base 28 remains in the desired position during the entire operation.
  • each stepped piston 13, 14 can be pressurized and controlled separately and independently of the others. The individual control makes it possible to compensate for unevenness in the nature of the piece of sheet metal to be bent by locally increasing or decreasing the pressure.
  • the die holder rests on a number of piston-cylinder units lined up next to one another.
  • the press brake is designated 40, which is equipped with a punch 41 which is received in a punch holder 42.
  • the punch holder 42 is arranged on the ram 43 of the press brake with the aid of piston-cylinder units 44.
  • the design of the piston-cylinder units 44 corresponds to the design described above.
  • a piston-cylinder unit 44 ′′ is arranged in a holding arm 42 ′.
  • a bending die 46 works together with the bending die 41, which is arranged in a die holder 47 on a table 48. At both ends of the bending die 46 there is a holder 49 for the adjustable reception of a threaded spindle 45 each, which extend into the movement path of the two piston-cylinder units 44 ′′.
  • the brackets 49 are adjusted synchronously with the height-adjustable bottom parts of the die 46, which are on the outside on both sides, as will be explained in more detail below.
  • This height-adjustable die base is designated 50 in FIG. 5 and is shown in more detail in FIGS. 6, 7 and 8.
  • pins 51 which are inserted into corresponding bores in the die 46.
  • the upper ends of the pins 51 are expediently provided with square heads 52, which together form a smooth surface of the die base.
  • the starting position can be seen in FIG. 5, where all the pins 51 assume the same height and their heads 52 define the flat die bottom 50.
  • the height of the pins 51 can be adjusted by means of wedges 54 which can be adjusted jointly or individually.
  • FIG. 8 schematically shows a view of FIG.
  • FIGS. 6 and 7 show that the two outer pins 51 with heads 52 assume a higher position than the rest.
  • the brackets 49 are adjusted synchronously with these.
  • the height of the adjustable base 50 of the bending die 46 is first set exactly according to the bending angle.
  • the punch 41 is lowered while the piston-cylinder units 44 have a pressure which is greater than the pressure required for air bending.
  • the two lateral piston-cylinder units 44 ' which act as stops, abut against the upper ends of the precisely adjusted threaded spindles 45. whereby the pistons of the piston-cylinder units 44 located in the area of the sheet-metal piece 53 and the pistons of the two piston-cylinder units 44 ′ lying on the extreme side are pushed back.
  • piston-cylinder units 44 are held in the top dead center position without pressure during the air bending, after which the punch 41 is stopped before reaching the die bottom.
  • the pistons of the piston-cylinder units 44 which are located above the sheet-metal piece 53, and the two outermost units 44 'are then pressurized, so that they press the bending punch 41 against the bending edge or against the stops 49 with constant pressure.
  • FIG. 6 A variant is shown in Figures 6 and 7.
  • the die base 50 is increased by the sheet thickness of the sheet metal piece 53 in the region of the piston-cylinder units lying on the extreme left and right. This position can be seen from FIG. 6 and in an enlarged view from FIG. 7.
  • the die base is increased at the corresponding points by adjusting the corresponding wedges 54 under the two outer pins 51.
  • FIG. 9 A somewhat more detailed illustration of the device described last can be seen in FIG. 9.
  • the parts which are already shown in FIG. 4 have been given the same reference numerals.
  • the press brake shown is provided with a die 27 with an adjustable die bottom 28, in which in turn pin-shaped inserts 29 rest against a carrier 30 which can be adjusted by means of a wedge system 31 through transverse spindles 32 with regulating members 33.
  • the parts mentioned are arranged in a die holder 26, in which, as already described, there is an additional wedge system 35 which can be actuated by a spindle 36 with a motor 37.
  • the two clamping members 34 serve to fasten the die holder on the table 58 of the press brake.
  • a punch 41 interacts with the die 27 and is fastened in the punch holder 42 with the aid of a fastening device 56. This is on the piston part 14 of the stepped piston 13, 14 arranged.
  • the ram 2 of the press brake is provided with a support plate 11, on which a number of cylinders 12 are provided side by side.
  • a stepped piston 13, 14 is guided in each cylinder 12, which collectively hold the punch holder 42 with the bending punch 41.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Claims (9)

  1. Procédé de pliage de pièces de tôle avec un poinçon de pliage (3, 41) et une matrice de pliage (5, 27) qui possède un fond (28, 50) réglable en hauteur, et où la matrice (5, 27) ou le poinçon (3, 41) est supporté par les pistons (14) d'une série d'unités à piston-cylindre alignées les unes à côté des autres, procédé dans lequel, quand le pliage pneumatique est terminé, la pièce de tôle (8, 53), qui est plus courte que la matrice (5, 27) et le poinçon (3, 41), est déformée uniformément le long de la courbe élastique de l'arête de poinçon (3, 41) et du fond (28, 50) de matrice, par coopération des unités à piston-cylindre, mises sous pression et situées dans la région de la pièce de tôle (8, 53), avec la matrice de pliage (5, 27) ou avec le poinçon (3, 41), caractérisé en ce que, dans la région des deux unités à piston-cylindre situées le plus à l'extérieur à droite et à gauche, aussi sous pression, la jonction entre les fentes d'air (11') situées entre le poinçon (3, 41) et le fond (28, 50) de matrice, qui correspondent à l'épaisseur de la pièce de tôle (8, 53) manquante à ces emplacements, est réalisée par des butées pour la stabilisation du poinçon de pliage (3, 41) et de la matrice de pliage (5, 27), et les unités restantes à piston-cylindre, dans la mesure où elles sont situées en-dehors de cette région de la pièce de tôle (8, 53) et sont mises sous pression, sont détendues quand le pliage pneumatique est terminé.
  2. Procédé selon la revendication 1, caractérisé en ce que, pour faire la jonction entre les fentes d'air (11') présentes entre le poinçon (3, 41) et le fond (28, 50) de matrice, les segments (52) du fond de matrice, situés le plus à l'extérieur à droite et à gauche, sont montés, ou les segments (4a, 4b) du poinçon, situés le plus à l'extérieur à droite et à gauche, sont abaissés, le poinçon (3, 41) venant buter contre les segments (52) remontés du fond de matrice, ou le fond (28, 50) de matrice venant buter contre les segments (4a, 4b) abaissés du poinçon.
  3. Procédé selon les revendications 1 et 2, caractérisé en que toutes les unités à piston-cylindre, avant le procédé de pliage, sont chargées d'une pression qui est plus grande que la force de pliage pneumatique nécessaire au pliage, grâce à quoi les pistons (14) sont déplacés contre une butée, après quoi, quand le pliage pneumatique est terminé, lorsque le bord de pliage de la pièce de tôle (8, 53) vient heurter le fond (28, 50) de matrice, les pistons (14) situés dans la région de la pièce de tôle (8, 53) sont repoussés, ainsi que les deux pistons (14), situés le plus à l'extérieur, des unités à piston-cylindre.
  4. Procédé selon les revendications 1 et 2, caractérisé en ce que les unités à piston-cylindre sont sans pression pendant le pliage pneumatique et, par conséquent, sont maintenues dans leur position inférieure au point mort ou sont poussées dans leur position supérieure au point mort, après quoi le poinçon de pliage (3, 41) est stoppé juste avant d'atteindre le fond (28, 50) de matrice, et les pistons (14) des unités à piston-cylindre, qui sont situés au-dessous ou au-dessus de la pièce de tôle (8, 53), sont mis sous pression, ainsi que les deux pistons (14) situés le plus à l'extérieur, de sorte que le bord de pliage de la pièce de tôle (8, 53) est poussé contre le fond (28, 50) de matrice, et les deux butées situées entre les deux unités à piston-cylindre situées le plus à l'extérieur font la jonction de part et d'autre de la fente d'air (11').
  5. Procédé selon les revendications 1-4, caractétisé en ce que la pression de travail des unités à piston-cylindre est augmentée ou diminuée aux endroits concernés pour compenser des irrégularités ponctuelles de la nature de la tôle ou des propriétés mécaniques ou des propriétés techniques de solidité de la pièce de tôle (8, 53).
  6. Utilisation d'un dispositif de pliage de pièces de tôle, lequel dispositif comporte un poinçon de pliage (41) formé de segments (4) et pouvant être actionné par un poussoir (43), avec un porte-poinçon (42), et une matrice de pliage (5) comportant un fond (28, 50) réglable et formé aussi de segments (52), laquelle matrice (5) est logée dans un porte-matrice (26, 47), le porte-matrice (26, 47) ou le porte-poinçon (42) étant supporté par les pistons (14) d'une série d'unités à piston-cylindre alignées les unes à côté des autres, directement ou par l'intermédiaire d'une plaque (25), où, quand le pliage pneumatique est terminé, la pièce de tôle (8, 53), qui est plus courte que la matrice (5) et le poinçon (41), est déformée uniformément le long de la courbe élastique de l'arête de poinçon (41) et du fond (28, 50) de matrice, par coopération des unités à piston-cylindre, mises sous pression et situées dans la région de la pièce de tôle (8, 53), avec la matrice de pliage (5) ou avec le poinçon (41), caractérisé en ce que, pour la mise en oeuvre du procédé selon les revendication 1-3, la jonction de part et d'autre des fentes d'air (11') correspondant à l'épaisseur de la tôle, aux deux extrémités du poinçon de pliage (41), est réalisée, au choix, par relèvement des segments (52) du fond de matrice situés le plus à l'extérieur ou par abaissement des segments (4a, 4b) de poinçon situés le plus à l'extérieur, sur une distance correspondant à l'épaisseur de la pièce de tôle (8, 53).
  7. Dispositif pour la mise en oeuvre du procédé de pliage de pièces de tôle selon les revendications 1-5, comportant un poinçon de pliage (41) formé de segments (4), pouvant être actionné par un poussoir (43) et comportant un porte-poinçon (42), et une matrice de pliage (5) disposée dans un porte-matrice (26, 47), comportant un fond (28, 50) réglable et aussi formé de segments (52), le porte-matrice (26, 47) ou le porte-poinçon (42) étant supporté, directement ou par l'intermédiaire d'une plaque (25), par les pistons (14) d'une série d'unités à piston-cylindre pouvant être mises sous pression, alignées les unes à côté des autres et pouvant être commandées individuellement et indépendamment les unes des autres, caractérisé en ce qu'il est prévu, aux deux extrémités du poussoir (2), des butées (9) pouvant se déplacer dans des supports (10), qui coopèrent avec des butées antagonistes (10') qui peuvent être déplacées de manière synchrone avec le fond (28, 50) de matrice pour effectuer la jonction aux emplacements où une fente d'air (11') est présente en raison de l'absence de pièce de tôle (8, 53).
  8. Dispositif selon le préambule de la revendication 7, caractérisé en ce que des butées (45) réglables sont présentes aux deux extrémités du porte-matrice (47), qui sont logées dans des supports (49) pouvant se déplacer de manière synchrone avec le fond (28, 50) de matrice et viennent buter contre les unités à piston-cylindre disposées aux deux extrémités du porte-poinçon (42).
  9. Dispositif selon la revendication 8, caractérisé en ce que les butées sont conformées en broches filetées (9, 45) réglables pour effectuer la jonction de part et d'autre d'une fente d'air (11') présente aux deux extrémités du poussoir (43) et correspondant à l'épaisseur de la tôle.
EP89810882A 1988-11-21 1989-11-20 Procédé et dispositif de pliage de pièces en tôle Expired - Lifetime EP0370956B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0284288A AT392023B (de) 1988-11-21 1988-11-21 Verfahren zum biegen von blechstuecken
AT2842/88 1988-11-21

Publications (3)

Publication Number Publication Date
EP0370956A2 EP0370956A2 (fr) 1990-05-30
EP0370956A3 EP0370956A3 (fr) 1991-05-02
EP0370956B1 true EP0370956B1 (fr) 1993-09-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP89810882A Expired - Lifetime EP0370956B1 (fr) 1988-11-21 1989-11-20 Procédé et dispositif de pliage de pièces en tôle

Country Status (6)

Country Link
US (1) US5097694A (fr)
EP (1) EP0370956B1 (fr)
JP (2) JPH02160120A (fr)
AT (2) AT392023B (fr)
DE (1) DE58905534D1 (fr)
ES (1) ES2043097T3 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0624411A1 (fr) * 1993-05-13 1994-11-17 Hämmerle Ag Procédé pour plier des tôles et presse à plier pour la mise en oeuvre du procédé
FR2708219B1 (fr) * 1993-07-27 1995-10-20 Amada Europ Sa Procédé de compensation des déformations des tabliers de presses hydrauliques, tabliers et presses hydrauliques ainsi équipés.
US5969973A (en) * 1994-11-09 1999-10-19 Amada Company, Ltd. Intelligent system for generating and executing a sheet metal bending plan
EP0841106A1 (fr) * 1996-11-12 1998-05-13 Maru Kikai Kogyo Co., Ltd. Presse plieuse
US20070056348A1 (en) * 2005-09-09 2007-03-15 David Leland Brake punch inserts
AT507809B1 (de) * 2009-01-27 2010-11-15 Trumpf Maschinen Austria Gmbh Biegepresse mit einem mehrteiligen pressenbalken
NL2006854C2 (nl) * 2011-05-26 2012-12-05 Wila Bv Werkwijze en inrichting voor het compenseren van afwijkingen bij een vervormende bewerking tussen twee balken van een pers.
AT512465B1 (de) * 2012-02-10 2014-01-15 Trumpf Maschinen Austria Gmbh Presstisch oder pressbalken mit verstellbarem balkenelement
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JPH08537U (ja) 1996-03-26
ATE94095T1 (de) 1993-09-15
EP0370956A3 (fr) 1991-05-02
ES2043097T3 (es) 1993-12-16
EP0370956A2 (fr) 1990-05-30
ATA284288A (de) 1990-07-15
AT392023B (de) 1991-01-10
JPH02160120A (ja) 1990-06-20
DE58905534D1 (de) 1993-10-14
JP2518512Y2 (ja) 1996-11-27
US5097694A (en) 1992-03-24

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