EP2734314B1 - Procédé de pliage d'une bande de tôle pour donner à la bande une forme hélicoïdale et appareil associé - Google Patents

Procédé de pliage d'une bande de tôle pour donner à la bande une forme hélicoïdale et appareil associé Download PDF

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Publication number
EP2734314B1
EP2734314B1 EP12740689.0A EP12740689A EP2734314B1 EP 2734314 B1 EP2734314 B1 EP 2734314B1 EP 12740689 A EP12740689 A EP 12740689A EP 2734314 B1 EP2734314 B1 EP 2734314B1
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EP
European Patent Office
Prior art keywords
band
abutting surface
radial
abutting
shape
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Not-in-force
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EP12740689.0A
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German (de)
English (en)
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EP2734314A1 (fr
Inventor
Lorenzo Verzola
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Tecnofer Srl
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Tecnofer 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
    • 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
    • B21D11/06—Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form

Definitions

  • the present invention relates to the technical sector relating to the bending of bands of metal sheet having an open ring shape, giving it a helical shape; the bands bent in this way can be assembled into multiple units such to obtain for example an Archimedes screw for transporting products or bolts for foundation piles.
  • the invention relates to a method for bending a band of sheet metal to give the band a helical shape and to an apparatus suitable for implementing this method.
  • An apparatus for bending a band of metal sheet having a shape of an open ring, designed to a helical shape to the bands.
  • These bands usually have a circular development and are identifiable in an inner radius, an outer radius and a circular development sector; in other words, these bands are in the form of circular rings devoid of a circular sector having an angle of between ten and twenty degrees.
  • the bands of sheet metal are flat and have to be bent to assume a predetermined helical pitch.
  • the bands can be welded into multiple units to form helices of a desired length, and be used for example as Archimedes screws for conveying products; in particular, for simplifying the operations of welding it is important that the two ends of the band be bent parallel to one another and lie on a plane parallel to the axis of the helix.
  • Figure 1 illustrates a band of metal sheet which is flat and is shaped as an open ring; figure 2 shows the band of figure 1 after it has been bent to take on a helical shape.
  • the above-mentioned known apparatus comprises a first member having a first abutting surface which can restingly receive a band of sheet metal of the above-described type; the first abutting surface is flat and horizontal and abuts a first radial portion of the lower band.
  • a punch is also provided, which is vertically mobile such as to exert a pressure on the band resting on the first abutting surface and thus to bend the band itself.
  • the punch is provided with a second abutting surface for abutting the band at a respective second radial portion of the upper band; the position of the punch with respect to the first member is such that if the projections of the first abutting surface and of the second abutting surface are considered with respect to a common horizontal plane, the angle which remains identified between these two projections is between five and ten degrees. As a consequence, the same angle is identifiable between the first radial portion and the second radial portion.
  • the second abutting surface is particularly close to the first abutting surface.
  • the mutual proximity of the first abutting surface with respect to the second abutting surface is necessary in order to contain the consequent relative rotation of the band during the bending step (in fact, from a horizontal position the band would tend to rotate and then to assume a vertical position).
  • the second abutting surface has a guillotine shape and is inclined at a given angle with respect to a horizontal plane; the guillotine is necessary in order to give the band a helical shape: in fact, during the bending step the second abutting surface contacts the second radial portion progressively as the punch continues its downward stroke. As a result, a bending occurs, of the part of band between the first radial portion of the lower band and the second upper radial portion of band, such that the part of the band takes on a shape that is alike to a portion of helix.
  • a disadvantage of this bending method consists in the fact that the above-described bending steps must be repeated many times (up to forty times), due to the fact that the angle between the first radial portion and the second radial portion is limited, as mentioned, to a value, for example, of between five and ten degrees.
  • the pitch of the spiral that is obtained is simultaneously varied; the orientation of the second surface, on the other hand, establishes the left-handed or right-handed helical turn of the band.
  • the punch Whenever it becomes necessary to change the pitch and/or shape, left or right, of the band that is to be obtained, the punch has to be replaced with one having suitable characteristics. This is particularly disadvantageous from the economic and practical point of view (storage and retrieval of the punches), as a considerable number of punches have to be available.
  • the aim of the present invention is to obviate the aforementioned drawbacks.
  • the above-mentioned method comprises steps of: supplying a band of sheet metal shaped as an open ring; abutting a first portion of the band with a first abutting surface; exerting a pressure on a radial second portion of the band, such that a part of the band comprised between the first portion and the radial second portion assumes a shape alike to a portion of helix.
  • the step of abutting the first portion of the band comprises blocking the band.
  • the pressure exerted on the second radial portion is obtained by: contacting the radial second portion of the band by means of a second abutting surface, and thereafter rotating the second abutting surface by a first angle and in a predetermined first direction such that the part of the band comprised between the first portion and the radial second portion assumes a shape alike to a portion of helix.
  • the second abutting surface contacts the second radial portion, preferably entirely; and thereafter the second abutting surface is rotated by a first angle and in a first direction, which determines a pressure on the second radial portion such as to cause a bending of the part of band comprised between the first portion and the second radial portion.
  • the specific rotation of the second surface is chosen so that this bending enables the part of band to assume a shape similar to the above-mentioned portion of helix.
  • the fact of blocking the first portion of band enables a second radial portion to be chosen that is further away from the first portion with respect to the prior art, which advantageously enables imparting a helical path on the band, by performing a smaller number of operating bending steps; by way of example, with the present invention the angular distance between the first portion and the second radial portion can be about twenty degrees.
  • productivity can be considerably increased with respect to the prior art, as it significantly reduces the time required to obtain a band having a helical shape.
  • the pitch the bent band is to assume can be selected, simply by adjusting the angle by which the second abutting surface is rotated; this is extremely advantageous due to the fact that a member can be used which bears the second abutting surface, and the angular travel that the second abutting surface must pass through can be adjusted as required.
  • the band can be bent such as to confer a left-handed or right-handed direction to the band.
  • a fourth abutting surface can be provided that is opposite the second abutting surface; the fourth abutting surface can rotate through a second angle and in a second direction, opposite the first direction.
  • the second abutting surface or the fourth abutting surface can be activated such as to obtain a band having a left-handed or right-handed helical shape.
  • the second abutting surface and fourth abutting surface can be fashioned in an opening provided in a second member and can rotate the second member in one direction or the other according to production requirements.
  • the above-mentioned apparatus comprises: a first member having a first abutting surface for abutting a first portion of a band of metal sheet having an open ring shape; a second member having a second abutting surface for abutting the band, the second member being mobile with respect to the first member in order to abut, via the relative second abutting surface, a radial second portion of the band, and being dimensioned such as to exert a pressure, via the relative second abutting surface, on the radial second portion of the band such that a part of the band comprised between the first portion and the radial second portion assumes a form alike to a portion of helix; characterised in that it comprises blocking means of the first portion of the band, comprising the first abutting surface; and in that: the second member is activatable in rotation such that the second abutting surface can contact the radial second portion of the band when the second member is in a non-operating position and such that the second a
  • (10) denotes in its entirety an apparatus for bending a band of sheer metal such as to confer thereon a helical shape, object of the present invention, which apparatus actuates a bending method for conferring on the band a helical shape, also object of the present invention.
  • the apparatus (10) comprises: a first member (1) having a first abutting surface (2) for abutting a first portion (3) of a band (4) of metal sheet having an open ring shape; a second member (5) having a second abutting surface (6) for abutting the band (4), the second member (5) being mobile with respect to the first member (1) in order to abut, via the relative second abutting surface (6), a radial second portion (19) of the band (4), and being dimensioned such as to exert a pressure, via the relative second abutting surface (6), on the radial second portion (19) of the band (4) such that a part of the band (4) comprised between the first portion (3) and the radial second portion (19) assumes a form alike to a portion of helix; ( figures 2 , 4B , 5B ); blocking means of the first portion (3) of the band (4), comprising the first abutting surface (2).
  • the second member (5) is activatable in rotation such that the second abutting surface (6) can contact the radial second portion (19) of the band (4) when the second member (5) is in a non-operating position (A) ( figures 3A-3C , 4A , 5A ) and such that the second abutting surface (6) subsequently rotates by a first angle and in a first direction (D1) ( figures 4B , 5B ) such that the part of the band (4) comprised between the first portion (3) and the radial second portion (19) assumes a form alike to a portion of helix.
  • the blocking means (7) are configured so that preferably the first portion (3) is radial.
  • the band (4) to be bent is flat ( figure 1 ).
  • the band (4) of figure 1 exhibits a circular shape, so that it is detectable by an inner radius, an outer radius and a sector having a circular development; the circular sector development can be, for example, to an amount of between three hundred and forty and three hundred and fifty degrees.
  • the band (4) can also have an irregular shape, for example oval.
  • the blocking means (7) preferably include a third abutting surface (8); the first abutting surface (2) and the third abutting surface (8) are opposite and arranged with respect to one another such as to receive there-between the first portion (3) of band (4) and block it.
  • the distance between the first abutting surface (2) and the second abutting surface (6) is preferably such as to enable a blocking with clearance of the first portion (3) of band (4). In this way, the bending of the band (4) gives the band (4) itself a more regular and uniform helical shape.
  • the first abutting surface (2) and the third abutting surface (8) are identifiable in an opening afforded in the first member (1).
  • the first member (1) is preferably solidly constrained to the frame (11) of the apparatus (10).
  • the first member (1) can comprise a disc centrally affording the first opening (9); the first opening (9) can be in the form of a slot open at one end; effectively it can have a stretched C-shape.
  • the second member (5) can comprise a disc centrally affording a second opening (21); the second opening (21) can have the shape of a slot open at one end, effectively an elongated C-shape.
  • the apparatus (10) can comprise a support (12) for the second member (5), which for example in the accompanying figures has a half-moon shape and is fixed to the frame (11); the second member (5) is rotatable with respect to the support (12).
  • the apparatus (10) also comprises actuating means for rotating the second member (5).
  • the actuating means can include: a hydraulic cylinder (13) having a jacket (14) thereof fixed to the frame (11) and the stem (15) which is articulated, at free end thereof, with a first arm (16) and a second arm (17) which are fixed to the second member (5).
  • the first arm (16) is for example fixed, by an fastening lug (18), to the second member (5) at a first surface of the second member (5);
  • the second arm (17) is for example fixed, by another fastening lug (18), to the second member (5) at a second surface of the second member (5) which is opposite the first surface.
  • Figures 4A and 5A are identical and show the second member (5) when in the inoperative position (A).
  • the lower surface and the upper surface of the first opening (9) of the first member (1) can be respectively termed the first abutting surface (2) and the third abutting surface (8).
  • the second abutting surface (6) can be referred to as the surface of the second opening (21) of the second member (5) which is parallel and aligned to the first abutting surface (2) of the first member (1 ).
  • the first abutting surface (2) and the third abutting surface (8) are preferably flat and parallel to a horizontal plane.
  • the second abutting surface (6) and the fourth abutting surface (20) are also preferably flat and parallel to a horizontal plane when the second member (5) is in the inoperative position (A). Consequently, the second abutting surface (6) and the fourth abutting surface (20) completely contact the second radial portion (19) of band (4) (respectively the lower and the upper portions).
  • the band (4) to be bent is arranged so that a first radial portion (3) of the band (4) is interposed between the first abutting surface (2) and the third abutting surface (8) of the first member (1) and so that a second radial portion (19) of the band (4) is interposed between the second abutting surface (6) and the fourth abutting surface (20).
  • the first portion (3) radially of the band (4) is located at an end of the band (4).
  • the bending of the part of band (4) between the first radial portion (3) and the second radial portion (19) is obtained, starting from the inoperative position (A) of the second member (5), by rotating the second member (5) thereof by a first angle and in a first direction (D1) (upwards-directed arrow in figure 4B ) if the band (4) is to be given a right-handed helical shape, or by rotating the second member (5) by a second angle and in a second direction (D2) (downwards-directed arrow of figure 5B ) if the band (4) is to be given a left-handed helical shape.
  • D1 upwards-directed arrow in figure 4B
  • D2 downwards-directed arrow of figure 5B
  • the band (4) is rotated by an angle approximately equal to the angle between the first radial portion (3) and the second radial portion (19): in this way a further portion of flat band (4), adjacent to the previous portion, can be interposed between the first opening (9) and the second opening (21) respectively of the first member (1) and the second member (5).
  • the first member (1) and the second member (5) are preferably vertically orientated and arranged inclined to one another, the reciprocal arrangement thereof defines the angle by which the first radial portion (3) of the band (4) is inclined with respect to the second radial portion (19) of the band (4).
  • the angle is approximately twenty degrees; the angle is preferably between fifteen degrees and thirty degrees.
  • Figures 4B , 5B illustrate the bending step of the last portion of flat band (4); as can be seen, the band (4) of figure 4B has now assumed a right-handed helical shape, while the band (4) of figure 5B has now assumed a helical left-handed shape.
  • the second member (5) is provided only with the second abutting surface (6) (the one that has been taken to be the lower surface of the second opening of the second member 5), acting on the lower surface of the second radial portion (19) of band (4): in fact, the fourth abutting surface (20) does not intervene during the fixed bending steps ( figures 4A, 4B ).
  • the second member (5) is provided only with the fourth abutting surface (20) (the one that has been taken to be the upper surface of the second opening of the second member), acting on the upper surface of the second radial portion (19) of band (4): in fact, the second abutting surface (6) does not intervene during the fixed bending steps ( figures 5A, 5B ).
  • the second member (5) is provided, in the embodiment illustrated in the figures, with a second opening (21) exhibiting both the second abutting surface (6) and the fourth abutting surface (20), gives the advantage that the apparatus (10) can be used to impart a right or left hand helical shape on the band.
  • the apparatus (10) can be used to impart a right or left hand helical shape on the band.
  • the above-described apparatus (10) more generally actuates a method, which is also object of the present invention, for bending a band (4) of sheet metal to impart a helical shape on the band (4).
  • the method comprises the steps of: supplying a band (4) of sheet metal shaped as an open ring; abutting a first portion (3) of the band (4) with a first abutting surface (2); exerting a pressure on a radial second portion (19) of the band (4), such that a part of the band (4) comprised between the first portion (3) and the radial second portion (19) assumes a shape alike to a portion of helix.
  • the step of abutting the first portion (3) of the band (4) comprises blocking the band (4).
  • the pressure exerted on the second radial portion (19) is obtained by: contacting the radial second portion (19) of the band (4) by means of a second abutting surface (6), and thereafter rotating the second abutting surface (6) by a first angle and in a predetermined first direction (D1) such that the part of the band (4) comprised between the first portion (3) and the radial second portion (19) assumes a shape alike to a portion of helix.
  • the blocking of the band (4) can be obtained by positioning the band (4) such that the first portion (3) thereof is interposed between the first abutting surface (2) and a third abutting surface (8).
  • the blocking can take place with a certain clearance, which can be determined by adjusting the mutual distance between the first abutting surface (2) and the third abutting surface (8).
  • the steps of blocking the band (4) at the first portion (3) and of exerting a pressure on the second radial portion (19) are preferably repeated on the other portions of the band (4) so as to cover the entire development of the band (4) and thus impart a helical shape to the band (4).
  • the second abutting surface (6) entirely contacts the second radial portion (19) of band (4).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Replacement Of Web Rolls (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Developing Agents For Electrophotography (AREA)

Claims (12)

  1. Un appareil (10) pour plier une bande (4) de tôle et donner à la bande (4) une forme hélicoïdale, comprenant :
    un premier organe (1) ayant une première surface de butée (2) pour rencontrer une première portion (3) d'une bande (4) de tôle ayant la forme d'un anneau ouvert ;
    un deuxième organe (5) ayant une deuxième surface de butée (6) pour rencontrer la bande (4), le deuxième organe (5) étant mobile par rapport au premier organe (1) de manière à rencontrer, par l'intermédiaire de la deuxième surface de butée (6) correspondante, une deuxième portion radiale (19) de la bande (4), et étant dimensionné de manière à exercer une pression, par l'intermédiaire de la deuxième surface de butée (6) correspondante, sur la deuxième portion radiale (19) de la bande (4) afin qu'une partie de la bande (4) comprise entre la première portion (3) et la deuxième portion radiale (19) prenne une forme semblable à une portion d'hélice ;
    caractérisé en ce qu'il comprend des moyens de blocage (7) de la première portion (3) de la bande (4), comprenant la première surface de butée (2) ;
    et en ce que :
    le deuxième organe (5) peut être mis en rotation de manière à ce que la deuxième surface de butée (6) puisse venir en contact avec la deuxième portion radiale (19) de la bande (4) quand le deuxième organe (5) est dans une position non opérationnelle (A) et de manière à ce que la deuxième surface de butée (6) tourne ensuite d'un premier angle et dans un premier sens (D1) afin que la partie de la bande (4) comprise entre la première portion (3) et la deuxième portion radiale (19) prenne une forme semblable à une portion d'hélice.
  2. L'appareil (10) selon la revendication précédente, dans lequel les moyens de blocage (7) comprennent en outre une troisième surface de butée (8), la première surface de butée (2) et la troisième surface de butée (8) étant opposées et disposées l'une par rapport à l'autre de manière à recevoir entre elles la première portion (3) de bande (4) et à la bloquer.
  3. L'appareil (10) selon la revendication précédente, dans lequel la distance entre la première surface de butée (2) et la deuxième surface de butée (6) est telle qu'elle permet un blocage avec jeu de la première portion (3) de bande (4).
  4. L'appareil (10) selon la revendication 2 ou 3, dans lequel la première surface de butée (2) et la troisième surface de butée (8) sont identifiables dans une ouverture présentée dans le premier organe (1).
  5. L'appareil selon l'une quelconque des revendications de 1 à 4, dans lequel quand le deuxième organe (5) est dans la position non opérationnelle (A), la deuxième surface de butée (6) est parallèle à la première surface.
  6. L'appareil (10) selon l'une quelconque des revendications de 1 à 5, dans lequel le deuxième organe (5) comprend une quatrième surface de butée (20) qui fait face à la deuxième surface de butée (6), le deuxième organe (5) pouvant être mis en rotation de manière à ce que la quatrième surface de butée (20) puisse venir en contact avec la deuxième portion radiale (19) de la bande (4) quand le deuxième organe (5) est dans une position non opérationnelle (A) et de manière à ce que la quatrième surface de butée (20) tourne ensuite d'un deuxième angle et dans une deuxième sens (D2), opposé au premier sens (D1), afin que la partie de la bande (4) comprise entre la première portion (3) et la deuxième portion radiale (19) prenne une forme semblable à une portion d'hélice.
  7. L'appareil selon l'une quelconque des revendications de 1 à 6, dans lequel la deuxième surface de butée (6) et la quatrième surface de butée (20) sont identifiables dans une ouverture présentée dans le deuxième organe (5).
  8. Un procédé de pliage d'une bande (4) de tôle pour donner à la bande (4) une forme hélicoïdale, utilisant un appareil selon l'une quelconque des revendications précédentes, comprenant les phases consistant à :
    alimenter une bande (4) de tôle ayant la forme d'un anneau ouvert ;
    mettre en butée une première portion (3) de la bande (4) avec une première surface de butée (2) ;
    exercer une pression sur une deuxième portion radiale (19) de la bande (4), de manière à ce qu'une partie de la bande (4) comprise entre la première portion (3) et la deuxième portion radiale (19) prenne une forme semblable à une portion d'hélice ;
    la phase consistant à mettre en butée la première portion (3) de la bande (4) comprend le blocage de la bande (4) ;
    la pression exercée sur la deuxième portion radiale (19) est obtenue :
    en venant en contact avec la deuxième portion radiale (19) de la bande (4) par l'intermédiaire d'une deuxième surface de butée (6), et ensuite
    en tournant la deuxième surface de butée (6) d'un premier angle et dans un premier sens (D1) prédéfini de manière à ce que la partie de la bande (4) comprise entre la première portion (3) et la deuxième portion radiale (19) prenne une forme semblable à une portion d'hélice.
  9. Le procédé selon la revendication précédente, dans lequel le blocage de la bande (4) est obtenu en positionnant la bande (4) de manière à ce que la première portion (3) correspondante soit interposée entre la première surface de butée (2) et une troisième surface de butée (8).
  10. Le procédé selon la revendication précédente, dans lequel le blocage est effectué avec un certain jeu, qui peut être défini en réglant la distance réciproque entre la première surface de butée (2) et la troisième surface de butée (8).
  11. Le procédé selon l'une quelconque des revendications précédentes, dans lequel les phases consistant à bloquer la bande (4) au niveau de la première portion (3) et à exercer une pression sur la deuxième portion radiale (19) sont répétées sur d'autres portions de bande (4) pour couvrir tout un développement de la bande (4) et donner ainsi à la bande (4) une forme hélicoïdale.
  12. Le procédé selon la revendication précédente, dans lequel le premier sens de rotation (D1) de la deuxième surface de butée (6) est choisi de manière à obtenir une forme hélicoïdale de la bande (4) qui est à gauche ou à droite.
EP12740689.0A 2011-07-21 2012-06-22 Procédé de pliage d'une bande de tôle pour donner à la bande une forme hélicoïdale et appareil associé Not-in-force EP2734314B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000435A ITBO20110435A1 (it) 2011-07-21 2011-07-21 Metodo di piegatura di un nastro di lamiera metallica per conferire al nastro un andamento elicoidale ed apparato idoneo per attuare tale metodo
PCT/IB2012/053161 WO2013011394A1 (fr) 2011-07-21 2012-06-22 Procédé de pliage d'une bande de tôle pour donner à la bande une forme hélicoïdale et appareil associé

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EP2734314A1 EP2734314A1 (fr) 2014-05-28
EP2734314B1 true EP2734314B1 (fr) 2017-04-19

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EP (1) EP2734314B1 (fr)
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WO (1) WO2013011394A1 (fr)

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ITUA20164225A1 (it) * 2016-06-09 2017-12-09 Tecnofer Srl Metodo e apparato per la realizzazione di una spira per coclea
IT201600082693A1 (it) * 2016-08-05 2018-02-05 Mille S R L Pressa per deformare una lamiera planare conformata ad anello aperto sino a conferirgli un andamento elicoidale
CN106140910A (zh) * 2016-08-18 2016-11-23 重庆环际低碳节能技术开发有限公司 一种螺旋形连接片的小端螺旋成型工装

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Publication number Priority date Publication date Assignee Title
IL32541A (en) * 1969-07-03 1973-08-29 Ben Nathan D A bending method for making curved sheet elements,particularly screw conveyor blades,and the articles so produced
US3667276A (en) * 1970-07-14 1972-06-06 Lee Norse Co Spiral element and method for making same

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ITBO20110435A1 (it) 2013-01-22
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