EP3581291B1 - Machine de pliage à tôles à géométrie des rouleaux modifiable - Google Patents

Machine de pliage à tôles à géométrie des rouleaux modifiable Download PDF

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Publication number
EP3581291B1
EP3581291B1 EP19178287.9A EP19178287A EP3581291B1 EP 3581291 B1 EP3581291 B1 EP 3581291B1 EP 19178287 A EP19178287 A EP 19178287A EP 3581291 B1 EP3581291 B1 EP 3581291B1
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EP
European Patent Office
Prior art keywords
roller
rocker arm
bending machine
bolt
rocker
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.)
Active
Application number
EP19178287.9A
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German (de)
English (en)
Other versions
EP3581291A1 (fr
EP3581291C0 (fr
Inventor
Mario Maier
Benjamin Schäuble
Florian Bittner
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.)
Haeusler Holding AG
Original Assignee
Haeusler Holding AG
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Publication date
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Publication of EP3581291A1 publication Critical patent/EP3581291A1/fr
Application granted granted Critical
Publication of EP3581291B1 publication Critical patent/EP3581291B1/fr
Publication of EP3581291C0 publication Critical patent/EP3581291C0/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
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
    • 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
    • B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
    • 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/08—Bending by altering the thickness of part of the cross-section of the work

Definitions

  • the invention relates to a bending machine with variable roller or shaft geometry, in particular a roller sheet metal bending machine with at least three rollers.
  • the invention relates to a bending machine, in particular a round bending machine according to the preamble of claim 1.
  • the bending of large sheets of metal into shaped parts is typically carried out with sheet metal bending machines, to which a sheet of metal is fed from one side and which use force to bring the sheet of metal into a desired shape as precisely as possible.
  • the force applied and the parameters of the sheet determine the degree of deformation.
  • a supplied sheet metal is essentially at the same temperature as its surroundings, which means that the sheet metal bending process is cold forming. Even if the embodiments of the invention described below are based on such a cold sheet, the method described and the corresponding control should not be limited to this. The method described can also be used for a heated or hot sheet.
  • the round bending machines described here work according to the known process of roll rounding and have at least three rollers.
  • the sheet metal to be bent can be clamped between two rollers, an upper and a lower roller, at least one of which is motor-driven, so that a sheet metal clamped between these rollers can be moved by rotating the rollers.
  • a bending force is exerted on the sheet metal using another roller, a side roller.
  • the sheet can be moved between the rollers of the bending machine and over the side roller by means of the at least one driven roller in such a way that the sheet is bent.
  • the machine can only have the top roller and a first and a second side roller.
  • a sheet metal to be bent is then passed over the first side roller, which can also be referred to as a secondary roll, is guided below the top roll and then over the second side roll, the second side roll being positioned so that the sheet metal is bent.
  • the advancement of the sheet metal can be designed in any way.
  • the invention described below is independent of whether the bending machine has an upper and/or lower roller of the machine. It can be used in a bending machine with a top and bottom roll or in a machine that only has one top or bottom roll.
  • the invention is described below using an embodiment of a bending machine which has an upper and a lower roller.
  • the degree of deformation during a bending process depends on a variety of parameters.
  • the properties of the sheet metal to be bent for example the sheet thickness as well as the deformability and toughness, have a significant influence on the achieved radius of the bent sheet metal.
  • the geometry of the rollers relative to each other and the geometric dimensions of the rollers arranged in the bending direction themselves determine the smallest possible bending radius during bending.
  • the theoretically smallest possible bending radius is typically the diameter of the top roll or the roll around whose radius the sheet metal is bent.
  • the sheet metal to be bent must be guided in such a way that it is guided as closely as possible to the corresponding roller, for example when the sheet metal is bent around the radius of the top roller, on this roller. Accordingly, the geometry of the rollers must be adapted to each other according to the desired bending radii and depending on the thickness of the sheet.
  • a side roller can be held in a rocker, which is fixed at one end in the supporting structure of a bending machine and is held at the other end by a hydraulic cylinder.
  • the position of the rocker arm and thus the position of the side roller held by it can be changed via the position of the hydraulic cylinder.
  • another actuator for example a threaded spindle, can be used.
  • Such rolling machines still have the disadvantage that the movable side roller can only be moved within narrow limits because one end of the rocker is fixed. Replacing the side roller or changing the position of the fixed end of the rocker requires considerable effort.
  • the US 6,044,675 describes a roll bending machine for bending metal sheets, the machine describing two or more bending rolls and a drive for a roll with which the roll can be rotated or its working position can be adjusted.
  • the US 2010 089 114 A1 describes a calendering machine with several rollers, two of which are adjustable via a threaded rod.
  • the DE 36 15 771 A1 describes a method and a device for round bending sheets with one top and two bottom rolls, with a roll gap set alternately between the top and one bottom roll and between the top and the other bottom roll through which the sheet metal to be bent is passed one after the other.
  • Both lower rollers are each mounted in rockers, the respective rocker being pivotally mounted about a stationary axis and the position of the lower rollers can be adjusted by motorized pivoting of the respective rockers.
  • Figure 1 shows a perspective view of a bending machine 1 with an upper roller 2, a lower roller 3 and a side roller 4.
  • at least the upper roller 2 or the lower roller 3 is motor-driven, so that a sheet metal to be bent (not shown in the figure) is between the upper - and the lower roller is clamped, can be moved by the upper or lower roller in the direction of the at least one side roller 4.
  • a sheet clamped between the top and bottom rolls can thus be moved in the direction of the side roll 4 and guided over the side roll 4, with the sheet metal being bent depending on the geometric arrangement of the side roll.
  • the bending machine is typically set up so that the distance between the top and bottom rolls can be changed, so that the distance between these two rolls can be adapted to the thickness of the sheet, i.e. at least one roll is movable so that a sheet is clamped between these two rolls and can be moved by rotating the rollers.
  • the three points necessary for bending the sheet are achieved by the top and bottom rollers 2, 3 and the side roller.
  • the bending lever adjusts when the side roller 4 is advanced.
  • the three points necessary for bending are realized by the first and second side rollers and the top roller.
  • the side roller 4 is held in a rocker 5 at at least one of its two ends.
  • This holder of the side roller 4 in the rocker 5 can be a bearing which allows the rotation of the side roller 4, i.e. the side roller is mounted in a corresponding bearing, for example a sliding or ball or roller bearing.
  • the swing arm 5 is as follows and with reference to Figures 2 will be described in more detail, held at its first end 5a on a support element and fixed at its second end 5b in a pivotable and releasable manner with respect to the position of the top roller.
  • the suspension point of the side roller 4 is geometrically placed between the first and second ends of the rocker 5.
  • the rocker arm is held in a support element 6, the holder allowing the rocker arm to rotate relative to the support element 6.
  • a holder can be achieved by means of a connecting bolt, with the bolt acting as an axis of rotation. Large forces can therefore be transmitted from the side roller 4 and via the rocker 5 to the support element 6 via the bolt, for example during a rolling process.
  • the rocker arm is detachably fixed to the bending machine 1, the fixing allowing a rotational movement of the rocker arm 5 about the fixing point at its second end 5b.
  • Such a fixing of the rocker 5 can be achieved in one embodiment by means of a combination of holes and bolts, with a (working) bolt 7 being guided through a hole in the rocker and a hole in (a housing part) of the bending machine 1, so that the Locking pin determines the position of the rocker arm 5 relative to the upper roller and the lower roller, at the same time allowing a rotational movement of the rocker arm about this fixing point, but can still be solved relatively easily, so that the connection between the rocker arm 5 and the supporting structure of the bending machine can be solved.
  • the bolt 7 can be easily released if the side roller 4 does not exert any force on the bolt.
  • the support element 6 supports the rocker 5 at its first end.
  • the support element 6 is rotatably connected to the rocker 5 and is also rotatably or pivotally mounted at its other end, for example with a bolt connection, the bolt simultaneously forming the axis of rotation.
  • the support element is designed to be movable along its length, so that the support element 6 can rotate or pivot the rocker arm 5 about the (working) bolt at the second end of the rocker arm.
  • the support element can be a hydraulic cylinder or similar, for example a threaded spindle, so that the position of the rocker 5 can be adjusted by means of the support 6. In this way, the position of the rocker 5 and thus the position of the side roller 4 held by the rocker 5 can be pivoted, so that the position of the side roller 4 can be adjusted relative to the upper and lower rollers.
  • the geometric arrangement of the rollers can be changed in this way, ie the side roller 4 can be moved closer to the top and bottom rollers 2, 3, so that a small bending radius can be set.
  • the rocker 5 can be pivoted so that the side roller is placed further away from the top and bottom rollers, so that a larger bending radius can be set.
  • Figure 2A shows a front view of the bending machine 1 with upper and lower rollers 2, 3 and the side roller 4, which is held by the rocker 5.
  • the embodiment shown here includes the three rollers mentioned above. Further embodiments can have, in addition to the side roller 4, one or more additional side or secondary rollers (not shown here).
  • the magnification A in Fig. 2A shows the side roller 4 and the rocker 5, the support element 6 being adjusted so that the rocker 5 is pivoted maximally outwards, ie the distance of the side roller 4 from the upper and lower rollers is maximum with the position of the holder of the rocker 5.
  • the first end 5a of the rocker arm can be connected to the support element 6 by means of a bolt.
  • the second end of the rocker 5 is fixed with a bolt in the supporting structure of the bending machine 1, the supporting structure designating that section of the bending machine which is intended to receive the bolt and thus to absorb the transmitted forces.
  • the supporting structure can therefore be an integral part of the bending machine 1, alternatively it can be a separate machine part.
  • the rocker arm 5 By adjusting the length of the support element 6, the rocker arm 5 can be pivoted, with the rocker arm rotating around the bolt 7 at the other end 5b.
  • the bolt 7 is guided through a hole in the rocker arm 5 and engages in a supporting structure of the bending machine 1, which absorbs the force transmitted by the bolt 7 and thus supports the rocker arm 5 and the side roller 4.
  • the rocker arm 5 has a hole 8a for receiving an interchangeable bolt 10, not shown here, and the supporting structure of the bending machine 1 has a corresponding hole 8b. These two holes are intended and designed accordingly so that an interchangeable bolt is guided through the hole 8a into the hole 8b, which can absorb the force of the rocker arm 5.
  • the force to be absorbed is essentially the weight force that is to be temporarily absorbed during the pivoting process described below, with the bending machine not being operated in a productive sense during the pivoting process.
  • the interchangeable bolt 10 therefore does not have to absorb the forces that occur during a bending process, but only the weight forces and can therefore be dimensioned correspondingly smaller.
  • the supporting structure of the bending machine which absorbs the forces of the (working) bolt 7 and the interchangeable bolt, has a further bore 9, which is intended to receive the (working) bolt 7.
  • Fig. 2B and in particular the section B show a position of the rocker arm 5, in which the rocker arm is, for example, from the in Fig. 2A position shown was pivoted so that the hole 8a in the rocker arm 5 is congruent with the hole 8b.
  • the length of the support element was adjusted accordingly, that is, in the present case, the hydraulic cylinder was extended to such an extent that the rocker arm 5 was rotated/pivoted around the bolt 7 to such an extent that the bores 8a and 8b are congruent, so that an interchangeable bolt 10 can be placed therein.
  • an interchangeable bolt 10 is placed in the bores 8a, 8b and thus in such a way that it connects the rocker arm 5 to the supporting structure of the bending machine, so that the interchangeable bolt carries the rocker arm 5 and the side roller 4 held therein.
  • the rocker 5 is pivoted from a first to a second position in relation to the upper and lower rollers 2, 3 of the bending machine and is pivotally or rotatably fixed there in a second position.
  • the interchangeable pin can be smaller, in particular with a smaller diameter, since it only has to carry the weight of the rocker 5 together with the side roller 4 mounted therein.
  • the position of the rocker arm 5 can now be changed by appropriately adjusting the support element 6, in particular pivoted about the interchangeable bolt 10.
  • the rocker arm 5 can be pivoted, here by approximately 53°, here by suitably shortening the support element 6, so that the hole in the rocker arm 5 for the bolt 7 is congruent with the hole 9 in the supporting structure of the bending machine 1.
  • Fig. 2E shows the swing arm 5 in the same position as in Fig. 2D , whereby the (working) bolt is placed in the rocker arm 5 and the bore 9, so that the bolt 7 carries the rocker arm 5 and the side roller 4.
  • both the bolt 7 and the interchangeable bolt 10 are placed in the rocker and the supporting structure of the bending machine 1, so that the rocker 5 is fixed by both bolts and therefore cannot be pivoted.
  • the interchangeable bolt 10 can be removed as soon as the bolt 7 is placed. Then the rocker arm 5 can be rotated or pivoted about the bolt 7. The rocker arm 5 is thus pivoted from the second to a third position and fixed there in a rotatable or pivotable manner.
  • the rocker 5 is arranged closer to the upper and lower rollers of the bending machine, since the bore 9 in the supporting structure is placed closer to the upper and lower rollers of the bending machine.
  • the side roller 4 can be placed closer to the top and bottom rollers. In the position shown, the side roller 4 is placed closer to the top and bottom rollers than in the figure in Fig. 2A position shown.
  • the placement of the rocker 5 together with the side roller 4 held therein can be changed so that the arrangement of the side roller in relation to the top and bottom rollers can be changed and adjusted according to requirements.
  • the force for pivoting and holding the rocker 5 and side roller 4 is applied via the support element 6 and the interchangeable bolt 10, so that while the side roller 4 is pivoting, it does not have to be held or lifted by means of a crane or the like.
  • the (working) bolt 7 and the interchangeable bolt 10 have to be placed at the respective end of the side roller, which can be done by hand or at least with considerably less effort.
  • the rocker arm 5 is moved from the first position, see Fig. 2A , about a second (intermediate) position, see Fig. 2C , pivoted into a third position, see Fig. 2F , with the side roller 4 in the third position being placed closer to the top and bottom rollers.
  • the side roller 4 can be pivoted from this position in a further pivoting process, first back into the second (intermediate) position and then back into the first position.
  • the side roller can be pivoted into one or more positions via an intermediate position, provided that corresponding bores 8b are provided for the interchangeable bolts and corresponding bores 9 for the (working) bolt.
  • the figures show an embodiment in which the side roller 4 can be arranged in two positions by means of the (working) bolt.
  • the supporting structure can Bending machine has further bores 8b, 9 for receiving the interchangeable and the (working) bolt 7, so that the rocker 5 can be pivoted into further positions.
  • the rocker in order to change the geometric arrangement of the side roller 4, the rocker is pivoted by means of the support element into an intermediate position in which the rocker is held by means of an interchangeable bolt 10, and from there pivoted again by means of the support element into the second position, in which the swing arm is then fixed again with the working bolt 7.
  • the rocker arm 5 can be fixed in a first or optionally in a second position.
  • moving the rocker into the second position so that it can be fixed there can be accomplished using other suitable means.
  • the swing arm can also be lifted into the second position using a crane.
  • the rocker itself can have more than one receptacle for a working bolt with which the rocker can be fixed.
  • FIG 3 shows a schematic representation of an alternative design of the rocker arm 5, which is suitably designed with different lever lengths.
  • the illustration shows a front view analogous to the Figures 2 , whereby only an upper roller 2 and a side roller 4 are shown, but not a lower roller or a second side roller.
  • this is pivotally and releasably fixed at one end with a working bolt 7 and has a bearing for receiving a side roller 4.
  • the arrangement of the support element is chosen so that different leverage ratios are established, namely such that a shorter path of the support element 6, but a greater force, is necessary for a pivoting movement of the rocker arm 5.
  • Figure 4 shows a further embodiment of a bending machine, in which a roller 4 is held in a rocker 5, and the rocker can be fixed at one end in relation to a roller in a second position.
  • Figure 4 shows a schematic view of a profile bending machine.
  • the bending shafts or rollers are only held on one side.
  • a tool can be attached to the free end of such a roller or shaft, which has the negative shape of the profile to be bent, so that the profile is held in the tool during the bending process and is therefore not damaged during the bending process.
  • This bending machine 1 like the ones described above, has a top roller 2, which is fixed.
  • the machine also includes two further rollers 3, 4, which are arranged symmetrically here and held in a respective rocker 5.
  • the rocker arm is fixed at one end 5a to a movable support element 6, which is shown in the figure as a hydraulic cylinder. With the other end 5b, the rocker 5 can be fixed in a first position and in a second position, with a rocker with the working bolt 7 being fixed in a first position but releasable, ie fixed in a first hole.
  • Figure 4 shows a determination of the rockers 5 in a respective first position.
  • each rocker 5 has a bore 8a and the supporting structure has corresponding bores 8b, into which a change pin can be inserted, so that a swing arm can be rotated into the second position about the respective change pin during the pivoting process.
  • the swing arm can then be fixed again with the working bolt 7.
  • the supporting structure of the profile bending machine has a corresponding hole 9 to accommodate the working bolt.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Claims (9)

  1. Machine de pliage (1) pour le pliage d'une tôle au moyen d'un rouleau supérieur (2), d'un autre rouleau (3) et d'au moins un rouleau latéral (4), dans laquelle le rouleau latéral (4) est maintenu dans un bras oscillant (5), dans laquelle le bras oscillant (5) est fixé par sa première extrémité (5a) à un élément de support (6) mobile, caractérisée en ce que le bras oscillant (6) peut être fixé de manière rotative, au niveau de sa seconde extrémité (5b), au moyen d'un boulon (7), dans un premier alésage dans une partie de boîtier de la machine de pliage dans une première position par rapport au rouleau supérieur et à l'autre rouleau, dans laquelle le bras oscillant (5) peut être fixé de manière rotative, au niveau de sa seconde extrémité (5b), au moyen du boulon (7), dans un autre alésage (3) dans la partie de boîtier de la machine de pliage dans une autre position par rapport au rouleau supérieur (2) et à l'autre rouleau.
  2. Machine de pliage (1) selon la revendication 1, dans laquelle le bras oscillant (5) peut être pivoté, au moyen de l'élément de support (6) mobile, dans l'autre position et peut y être fixé au niveau de sa seconde extrémité (5b).
  3. Machine de pliage (1) selon la revendication 2, dans laquelle le bras oscillant (5) peut être pivoté, au moyen de l'élément de support (6) mobile, de la première position vers une position intermédiaire et peut y être fixé.
  4. Machine de pliage (1) selon l'une quelconque des revendications précédentes, dans laquelle le bras oscillant (5) peut être fixé de manière pivotante dans la position intermédiaire.
  5. Machine de pliage (1) selon l'une quelconque des revendications précédentes, dans laquelle l'au moins un rouleau latéral (4) est maintenu de manière rotative à ses deux extrémités dans un bras oscillant (5).
  6. Procédé pour la modification de la disposition d'un rouleau d'une machine de pliage (1) comportant un rouleau supérieur (2), un autre rouleau (3) et au moins un rouleau latéral (4), dans lequel le rouleau latéral (4) est maintenu dans un bras oscillant (5), lequel est fixé par sa première extrémité (5a) à un élément de support (6) mobile, caractérisé en ce que le bras oscillant (6) est fixé de manière rotative, au niveau de sa seconde extrémité (5b), au moyen d'un boulon (7), dans un premier alésage dans une partie de boîtier de la machine de pliage dans une première position par rapport au rouleau supérieur (2) et à l'autre rouleau (3), le procédé comprenant le déplacement du bras oscillant (5) dans une autre position et la fixation de manière rotative de la seconde extrémité (5b) du bras oscillant (5), au moyen du boulon (7), dans un autre alésage dans la partie de boîtier de la machine de pliage dans l'autre position par rapport au rouleau supérieur (2) et à l'autre rouleau (3).
  7. Procédé selon la revendication 6, comprenant
    le pivotement du bras oscillant (5) au moyen de l'élément de support (6) dans l'autre position et la fixation de manière rotative du bras oscillant (5) dans la seconde position.
  8. Procédé selon la revendication 6, comprenant
    le pivotement du bras oscillant (5) au moyen de l'élément de support (6) de la première position vers une position intermédiaire, et
    la fixation de manière rotative du bras oscillant (5) dans la position intermédiaire.
  9. Procédé selon la revendication 8, comprenant en outre
    la fixation de manière rotative du bras oscillant (5) dans la position intermédiaire au moyen d'un boulon (10).
EP19178287.9A 2018-06-12 2019-06-04 Machine de pliage à tôles à géométrie des rouleaux modifiable Active EP3581291B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018113966.7A DE102018113966B3 (de) 2018-06-12 2018-06-12 Biegemaschine zum Biegen eines Blechs sowie Verfahren zur Änderung der Anordnung einer Walze einer Biegemaschine

Publications (3)

Publication Number Publication Date
EP3581291A1 EP3581291A1 (fr) 2019-12-18
EP3581291B1 true EP3581291B1 (fr) 2023-09-13
EP3581291C0 EP3581291C0 (fr) 2023-09-13

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Application Number Title Priority Date Filing Date
EP19178287.9A Active EP3581291B1 (fr) 2018-06-12 2019-06-04 Machine de pliage à tôles à géométrie des rouleaux modifiable

Country Status (3)

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US (1) US11548049B2 (fr)
EP (1) EP3581291B1 (fr)
DE (1) DE102018113966B3 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100089114A1 (en) * 2007-02-21 2010-04-15 Boldrini S.P.A. Apparatus for bending plates with rolls

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1949401A (en) * 1933-08-24 1934-03-06 James C Baldwin Metal bending machine
CH269241A (de) * 1948-11-12 1950-06-30 Zurschmitten Joseph Rundbiegemaschine.
US3309908A (en) * 1964-09-28 1967-03-21 Gen Electric Rolling method and apparatus
DE3615771A1 (de) 1986-05-10 1987-11-12 Reinhardt Gmbh Maschbau Verfahren und vorrichtung zum rundbiegen von blechen
EP0477752B1 (fr) * 1990-09-28 1995-03-29 Promau S.R.L. Dispositif programmable pour rouler les tôles
US5361618A (en) * 1993-04-01 1994-11-08 Italimpianti Of America, Inc. Method and apparatus for adjusting bending rolls
IT1296576B1 (it) * 1997-11-27 1999-07-14 Promau Srl Apparecchiatura automatica per la curvatura di lamiere, con controllo selettivo digitale

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100089114A1 (en) * 2007-02-21 2010-04-15 Boldrini S.P.A. Apparatus for bending plates with rolls

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Publication number Publication date
US20190374989A1 (en) 2019-12-12
DE102018113966B3 (de) 2019-08-01
US11548049B2 (en) 2023-01-10
EP3581291A1 (fr) 2019-12-18
EP3581291C0 (fr) 2023-09-13

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