EP3643421B1 - Machine de cintrage et son procédé d'utilisation - Google Patents

Machine de cintrage et son procédé d'utilisation Download PDF

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Publication number
EP3643421B1
EP3643421B1 EP19204659.7A EP19204659A EP3643421B1 EP 3643421 B1 EP3643421 B1 EP 3643421B1 EP 19204659 A EP19204659 A EP 19204659A EP 3643421 B1 EP3643421 B1 EP 3643421B1
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EP
European Patent Office
Prior art keywords
roller
metal sheet
upper roller
bending machine
rear side
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Application number
EP19204659.7A
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German (de)
English (en)
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EP3643421A1 (fr
Inventor
Franco BARCA
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Mg Srl
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Mg Srl
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    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/004—Bending sheet metal along straight lines, e.g. to form simple curves with program control

Definitions

  • the present invention relates to a four-roller bending machine for bending sheets, profiles and the like made of metal.
  • the present invention further relates to a method for using said bending machine for bending metal sheets, profiles and the like.
  • the document US2018133772 A1 describes a bending machine comprising a fixed top roller, a vertically displaceable bottom roller and two side rollers, these, too, being movable.
  • This bending machine for bending a metal sheet provides for a step, so-called invitation, in which an end of the metal sheet is clamped between the top roller and the bottom roller and in which a side roller, namely the roller on the side from which the metal sheet has been inserted, is lifted, thus moving closer to the top roller, so as to bend a portion of metal sheet close to the end thereof.
  • GB800349A which forms the basis for the preamble of the appended claim 1, describes a bending machine with a horizontally moveable upper roller, a vertically moveable lower roller and two obliquely moveable side rollers.
  • the Applicant has observed that four-roller bending machines like the one described in the above-mentioned document have the problem that they cannot bend the ends of the metal sheets in an optimal manner, because, following the invitation step, the metal sheet has a too long straight portion adjacent to the end of the metal sheet. More particularly, the Applicant has observed that such straight portion is at least twice the thickness of the metal sheet to be bent.
  • the object of the present invention is to overcome the problems and limitations of prior art by providing a four-roller bending machine that allows to bend metal sheets and the like in an optimal manner, reducing the length of the straight portions adjacent to the ends of the metal sheet.
  • a further object of the present invention is to provide a versatile four-roller bending machine that can take on different configurations as required.
  • the bending machine comprises an upper roller, a lower roller, a rear side roller and a front side roller as well as a supporting frame to which said upper roller, lower roller, rear side roller and front side roller are mounted.
  • Said upper roller, lower roller, first side roller and second side roller are all cylindrical rollers.
  • each of said rollers is made as a single piece.
  • At least one out of the upper roller and the lower roller is a motor-driven roller, i.e. a roller associated with a motor in order to be rotated about its own longitudinal axis.
  • a motor-driven roller i.e. a roller associated with a motor in order to be rotated about its own longitudinal axis.
  • the upper roller and the lower roller and the front and rear rollers are all motor-driven rollers.
  • the upper roller is mounted vertically displaceable, in such a way that it can translate, moving away from or close to the lower roller, and the lower roller is mounted horizontally displaceable, in such a way that it can translate relative to the upper roller. More particularly, the lower roller is configured to be moved at least forward or backward relative to a vertical direction of translation of the upper roller.
  • the rear and front side rollers are displaceably mounted to the frame so as to be translatable by moving away from or close to the upper roller. More particularly, the side rollers can translate along rectilinear or curved trajectories that are oblique relative to the rectilinear vertical direction of translation of the upper roller and to the rectilinear horizontal direction of translation of the lower roller and that are directed towards the upper roller, so that said side rollers can be moved away from or close to the upper roller.
  • the translational motions of said upper roller, lower roller, rear side roller and front side roller are imparted by means of respective hydraulic actuators and are preferably guided by means of suitable rectilinear or curved guides.
  • a method for using the bending machine provides for the steps of:
  • the lower roller is kept with its longitudinal axis always vertically aligned with respect to the longitudinal axis of the upper roller.
  • the upper roller is kept always lifted and that, for bending the metal sheet, only three rollers are used, namely the upper roller (motor-driven) and two side rollers (either motor-driven or idle).
  • This configuration is of advantage, for example, for obtaining large diameter bending.
  • the bending machine can be used for carrying out frustoconical bending.
  • the bending machine according to the invention is therefore highly versatile, as it can take on different configurations as required.
  • a preferred embodiment of a bending machine 10 according to the invention for bending metal sheets, profiles and the like (in the following, to simplify, reference will be made to a metal sheet 30) will be described here below.
  • the bending machine 10 comprises a supporting frame 11 to which an upper roller 12, a lower roller 13, a first side roller 14 and a second side roller 15 are mounted so as to be displaceable independently of one another.
  • the aforesaid upper roller 12, lower roller 13, first side roller 14 and second side roller 15 are all cylindrical rollers, i.e. they have a cylindrical outer surface.
  • each of the said rollers is made as single piece, whereby the points of the cylindrical surface of each roller rotate all at the same speed when the roller is rotated.
  • the upper roller 12 is a motor-driven roller, for example actuated by a hydraulic motor (not shown) preferably associated to one of the ends of the roller, for example by means of a suitable gear motor, in order to transmit to the upper roller 12 a rotational motion about its longitudinal axis X.
  • a hydraulic motor not shown
  • the upper roller 12 is vertically displaceable, i.e. it can be translated along a rectilinear vertical direction, in such a way that it can be moved away from or close to the lower roller 13.
  • the translational motion of the upper roller 12 is imparted by means of two hydraulic actuators 16 (only one of which is shown), each associated with a respective end of the roller 12.
  • the translational motion is guided by means of rectilinear vertical guides 21.
  • the lower roller 13 is, preferably, a motor-driven roller, associated, similarly to what has been described above in connection with the upper roller 12, with a corresponding motor, for example by means of a gear motor, in order to transmit to the lower roller 13 a rotational motion about its longitudinal axis Y.
  • the lower roller 13 is horizontally displaceable, i.e. it can be translated along a rectilinear horizontal direction, so as to be movable forward and/or backward relative to the rectilinear vertical direction of translation of the upper roller 12.
  • the translational motion of the lower roller 13 is imparted, preferably, by means of two pairs of hydraulic actuators 17, 18 (only one of which is shown), each pair being associated with a respective end of the roller 13, and is guided, preferably, by means of rectilinear horizontal guides 22.
  • the first side roller 14 is arranged rearwardly with respect to the lower roller 13, i.e., by convention, on the side from which the metal sheet to be bent is inserted into the bending machine.
  • the second side roller is arranged frontally with respect to the lower roller, i.e. on the side opposite to the side from which the metal sheet to be bent 30 is inserted into the bending machine.
  • Both side rollers 14, 15 are, preferably, motor-driven rollers, each of them being associated, in a manner similar to the one described above in connection with the upper roller 12, with a corresponding motor, for example by means of a gear motor, in order to transmit to each side roller 14, 15 a rotational motion about the respective longitudinal axis Z, W.
  • the side rollers 14, 15 are displaceable along respective rectilinear directions that are oblique relative to the rectilinear vertical direction of translation of the upper roller 12 and to the rectilinear horizontal direction of translation of the lower roller 13, and are directed towards the upper roller 12, so that these rollers can be moved away from or close to the upper roller 12.
  • the translational motion of each side roller 14, 15 is imparted, preferably, by means of two respective hydraulic actuators 19, 20 (only one of which is shown), associated with the ends of the respective side roller 14, 15.
  • the translational motion of each side roller 14, 15 is guided, preferably, by means of corresponding rectilinear oblique guides 23, 24.
  • the side rollers translate along curved trajectories.
  • the rollers can translate guided by planetary guides or be supported by corresponding swinging arms hinged on side pivots.
  • the lower roller and/or the side rollers can be idle rollers rather than motor-driven rollers.
  • rollers 12, 13, 14, 15 of the bending machine 10 are preferably supported by bearings (not shown) in order to enable rotational motion of said rollers.
  • the bending machine 10 is preferably controlled by means of NC systems and is provided with electronic control of the parallelism of the side rollers 14, 15 and of the upper roller 12.
  • a first step ( Figure 2a ) the rear side roller 14 is lowered and the upper roller 12 is lifted so as to enable the metal sheet to be bent 30 to be inserted between the lower roller 13 and the upper roller 12, from the insertion side (by convention, the rear side).
  • the front side roller 15 lies at the height of insertion of the metal sheet 30 and is used as a striker for the front end 31 of the metal sheet 30, thus allowing to align said sheet.
  • the upper roller 12 is lowered so as to clamp the metal sheet 30 between the upper roller 12 and the lower roller 13, which has its longitudinal axis Y vertically aligned with respect to the longitudinal axis X of the upper roller 12 ( Figure 2b ).
  • the metal sheet 30 is advantageously kept clamped during all the subsequent steps, thus preventing possible slipping of the metal sheet and therefore keeping the metal sheet aligned.
  • the lower roller 13 is then translated forward ( Figure 2d ) and the upper roller 12 is lowered ( Figure 2e ), so as to bend a portion 30a of the metal sheet 30 close to its front end 31 while the metal sheet 30 rests on the rear side roller 14.
  • the aforesaid step of bending the portion 30a of the metal sheet 30 close to its front end 31 is called invitation (first invitation).
  • rollers 12, 13, 14, 15 are rotated in such a way that the metal sheet 30 is advanced until its rear end 32 is clamped between the upper roller 12 and the lower roller 13 ( Figure 2f ).
  • the lower roller 13 is then translated forward ( Figure 2g ) and the upper roller 12 is lowered ( Figure 2h ), so as to bend a portion 30b of the metal sheet 30 close to its rear end 32 while the metal sheet 30 rests on the front side roller 15.
  • the aforesaid step of bending the portion 30b of the metal sheet 30 close to its rear end 32 is called invitation (second invitation).
  • the lower roller 13 is translated forward, so that it is brought back with its longitudinal axis Y vertically aligned with respect to the longitudinal axis X of the upper roller 12, and the front side roller 15 is lifted, thus bending a portion 30c of the metal sheet 30 comprised between the upper 12 and lower 13 rollers and the front side roller 15 ( Figure 2i ).
  • the upper roller 12 and the lower roller 13 are then rotated so that the metal sheet 30 is moved back until the portion 30c of the metal sheet 30 bent in the foregoing step lies rearwardly relative to the upper roller 12 and the lower roller 13 ( Figure 2l ).
  • the front side roller supports the metal sheet, without bending it further.
  • the front side roller 15 is then lowered while the rear side roller 14 is lifted until it comes into contact with the metal sheet 30 ( Figure 2m ).
  • the bending machine 10 according to the present invention can also be used by keeping the lower roller 13 with its longitudinal axis Y always vertically aligned with respect to the longitudinal axis X of the upper roller 12.
  • a first step ( Figure 3a ) the rear side roller 14 is lowered and the upper roller 12 is lifted so as to allow the metal sheet to be bent 30 to be inserted between the lower roller 13 and the upper roller 12, from the insertion side (by convention, the rear side).
  • the rear side roller 14 lies at the height of insertion of the metal sheet 30 and is used as a striker for the front end 31 of the metal sheet 30, thus allowing to align the metal sheet.
  • the upper roller 12 is lowered in such a way that the metal sheet 30 is clamped between the upper roller 12 and the lower roller 13 ( Figure 3b ).
  • the metal sheet 30 is advantageously kept clamped during all the subsequent steps, thus preventing possible slipping of the metal sheet and therefore keeping the metal sheet aligned.
  • the rear side roller 14 is then lifted, thus bending a metal sheet portion 30d comprised between the upper 12 and lower 13 rollers and the rear side roller 14 ( Figure 3d ).
  • the aforesaid step of bending the metal sheet 30 is called first invitation.
  • the upper roller 12 and the lower roller 13 are then rotated so that the metal sheet 30 is advanced until the portion 30d of the metal sheet 30 bent during the preceding step lies frontally with respect to the upper roller 12 and lower roller 13 ( Figure 3e ).
  • the front side roller supports the metal sheet without bending it further.
  • the rear side roller 14 is then lowered while the front side roller 15 is lifted, until it comes into contact with the metal sheet 30 ( Figure 3f ).
  • the bending machine 10 according to the present invention can also be used by keeping the upper roller 12 always lifted, thus using only three rollers for bending the metal sheet, namely the upper roller 12 and the two side rollers 14, 15.
  • a first step ( Figure 4a ) the rear side roller 14 is lowered so as to allow the metal sheet to be bent 30 to be inserted horizontally between the upper roller 12 and the rear side roller 14, from the insertion side (by convention, the rear side).
  • the front side rollers 15 lies at the height of insertion of the metal sheet 30 and is used as a striker for the front end 31 of the metal sheet 30, thus allowing to align the metal sheet.
  • the rollers 12, 14, 15 After having brought the side rollers 14, 15 to the same height, the rollers 12, 14, 15 are rotated, thus bringing the rear portion 32 of the metal sheet 30 between the rear side roller 14 and the upper roller 12.
  • the front side roller 15 is then lifted and the rollers 12, 14, 15 are rotated so that the metal sheet 30 is moved back and a central portion 30g thereof is bent ( Figure 4d ) until a cylindrical shape, a so-called shell 33, is obtained (4e).
  • the bending machine 10 when the bending machine 10 operates in its configuration with the non-translating lower roller 13, after the first invitation it is possible to advance the metal sheet 30 without bending it, and bend a portion of the metal sheet close to the rear end 32 thereof (i.e. carrying out the second invitation), and only thereafter the central portion of the metal sheet 30 is bent.
  • the bending machine 10 can be used for effecting frustoconical bending of the metal sheet.

Claims (8)

  1. Machine à cintrer (10) comprenant :
    - un rouleau supérieur (12), un rouleau inférieur (13), un rouleau de côté arrière (14) et un rouleau de côté avant (15),
    - un cadre de support (11) sur lequel sont montés lesdits rouleau supérieur (12), rouleau inférieur (13), rouleau de côté arrière (14) et rouleau de côté avant (15),
    dans laquelle au moins l'un du rouleau supérieur (12) et du rouleau inférieur (13) est un rouleau entraîné par moteur et dans laquelle le rouleau de côté arrière (14) et le rouleau de côté avant (15) sont montés déplaçables sur le cadre (11) de façon à pouvoir effectuer une translation en s'éloignant/se rapprochant du rouleau supérieur (12),
    dans laquelle lesdits rouleau supérieur (12), rouleau inférieur (13), rouleau de côté arrière (14) et rouleau de côté avant (15) sont des rouleaux cylindriques,
    caractérisée en ce que
    le rouleau supérieur (12) est monté déplaçable verticalement, de façon à pouvoir effectuer une translation suivant une direction de translation verticale rectiligne en s'éloignant ou en se rapprochant du rouleau inférieur (13), et le rouleau inférieur (13) est monté déplaçable horizontalement de façon à pouvoir effectuer une translation par rapport au rouleau supérieur (12) suivant une direction de translation horizontale rectiligne, et en ce que
    les rouleaux de côté (14, 15) effectuent une translation suivant des trajectoires rectilignes ou courbées qui sont obliques par rapport à la direction de translation verticale rectiligne du rouleau supérieur (12) et à la direction de translation horizontale rectiligne du rouleau inférieur (13) et qui sont dirigées vers le rouleau supérieur (12), de sorte que lesdits rouleaux de côté (14, 15) puissent être éloignés ou rapprochés du rouleau supérieur (12).
  2. Machine à cintrer (10) selon la revendication 1, dans laquelle le rouleau inférieur (13) monté déplaçable horizontalement est configuré pour être mobile vers l'avant et/ou vers l'arrière par rapport à la direction de translation verticale rectiligne du rouleau supérieur (12).
  3. Machine à cintrer (10) selon la revendication 1 ou 2, dans laquelle le rouleau de côté avant (15) et le rouleau de côté arrière (14) sont des rouleaux entraînés par moteur.
  4. Machine à cintrer (10) selon l'une quelconque des revendications précédentes, qui est commandée au moyen de systèmes à commande numérique.
  5. Machine à cintrer (10) selon l'une quelconque des revendications précédentes, dans laquelle les mouvements de translation desdits rouleau supérieur (12), rouleau inférieur (13), rouleau de côté arrière (14) et rouleau de côté avant (15) sont communiqués au moyen d'actionneurs hydrauliques (16, 17, 18, 19, 20) correspondants.
  6. Machine à cintrer (10) selon l'une quelconque des revendications précédentes, comprenant en outre des guides (21, 22, 23, 24) agencés pour guider les mouvements de translation desdits rouleau supérieur (12), rouleau inférieur (13), rouleau de côté arrière (14) et rouleau de côté avant (15), respectivement.
  7. Procédé d'utilisation d'une machine à cintrer (10) selon l'une quelconque des revendications 1 à 6, comprenant les étapes consistant à :
    - insérer la tôle de métal à cintrer (30) entre le rouleau inférieur (13) et le rouleau supérieur (12) ;
    - abaisser verticalement le rouleau supérieur (12) de façon à serrer la tôle de métal (30) entre le rouleau supérieur (12) et le rouleau inférieur (13), qui a son axe longitudinal (Y) aligné verticalement par rapport à l'axe longitudinal (X) du rouleau supérieur (12) ;
    - conserver la tôle de métal (30) serrée pendant toutes les étapes ultérieures, ce qui permet d'empêcher un glissement éventuel de la tôle de métal (30) et de conserver par conséquent la tôle de métal (30) alignée ;
    - effectuer une translation horizontale du rouleau inférieur (13) vers l'avant/vers l'arrière par rapport à une position dans laquelle l'axe longitudinal (Y) du rouleau inférieur (13) est aligné verticalement par rapport à l'axe longitudinal (X) du rouleau supérieur (12) ;
    - abaisser verticalement le rouleau supérieur (12) de façon à cintrer une portion (30a, 30b) de la tôle de métal (30) tandis que la tôle de métal (30) repose sur le rouleau de côté arrière (14)/le rouleau de côté avant (15), respectivement ;
    - ramener le rouleau inférieur (13) avec son axe longitudinal (Y) aligné verticalement par rapport à l'axe longitudinal (X) du rouleau supérieur (12) ;
    - lever le rouleau de côté arrière (14)/le rouleau de côté avant (15), ce qui permet de cintrer une portion (30c) de la tôle de métal (30) comprise entre les rouleaux supérieur et inférieur (12, 13) et le rouleau de côté arrière (14)/le rouleau de côté avant (15).
  8. Procédé selon la revendication 7, dans lequel lesdites étapes consistant à effectuer une translation horizontale du rouleau inférieur (13) vers l'avant/vers l'arrière et à abaisser verticalement le rouleau supérieur (12) sont réalisées lorsque l'extrémité avant (31)/l'extrémité arrière (32) de la tôle de métal (30) sont serrées entre le rouleau supérieur (12) et le rouleau inférieur (13), respectivement.
EP19204659.7A 2018-10-23 2019-10-22 Machine de cintrage et son procédé d'utilisation Active EP3643421B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102018000009727A IT201800009727A1 (it) 2018-10-23 2018-10-23 Calandra a quattro rulli e relativo metodo di utilizzo

Publications (2)

Publication Number Publication Date
EP3643421A1 EP3643421A1 (fr) 2020-04-29
EP3643421B1 true EP3643421B1 (fr) 2021-08-11

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EP19204659.7A Active EP3643421B1 (fr) 2018-10-23 2019-10-22 Machine de cintrage et son procédé d'utilisation

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EP (1) EP3643421B1 (fr)
IT (1) IT201800009727A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB793221A (en) * 1955-06-27 1958-04-09 Creusot Forges Ateliers Improvements in machines for the bending of sheet metal, and more particularly in those having four rollers
GB800349A (en) * 1955-11-30 1958-08-27 Bigwood Joshua & Son Ltd Improvements in or relating to plate bending machines
JPS5199659A (ja) * 1975-02-28 1976-09-02 Mitsubishi Heavy Ind Ltd Roorunyorukohannokiujoseikeihooyobisochi
JPS54124039U (fr) * 1978-02-17 1979-08-30
JP2016153137A (ja) * 2015-02-20 2016-08-25 株式会社栗本鐵工所 ベンディング装置及び鋼板のベンディング方法
US10751779B2 (en) 2016-11-11 2020-08-25 Mega Manufacturing, Inc. Plate roll bending machine bending control system and method

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EP3643421A1 (fr) 2020-04-29
IT201800009727A1 (it) 2020-04-23

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