EP2623227A1 - Installation pour le cintrage de barres métalliques - Google Patents

Installation pour le cintrage de barres métalliques Download PDF

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Publication number
EP2623227A1
EP2623227A1 EP13153175.8A EP13153175A EP2623227A1 EP 2623227 A1 EP2623227 A1 EP 2623227A1 EP 13153175 A EP13153175 A EP 13153175A EP 2623227 A1 EP2623227 A1 EP 2623227A1
Authority
EP
European Patent Office
Prior art keywords
bars
another
bending
thrust member
thrust
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.)
Granted
Application number
EP13153175.8A
Other languages
German (de)
English (en)
Other versions
EP2623227B1 (fr
Inventor
Stefano Peruzzo
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.)
OSCAM S.R.L.
Original Assignee
Oscam SpA
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Filing date
Publication date
Application filed by Oscam SpA filed Critical Oscam SpA
Publication of EP2623227A1 publication Critical patent/EP2623227A1/fr
Application granted granted Critical
Publication of EP2623227B1 publication Critical patent/EP2623227B1/fr
Active legal-status Critical Current
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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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/006—Feeding elongated articles, such as tubes, bars, or profiles
    • 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
    • B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
    • B21D11/12—Bending specially adapted to produce specific articles, e.g. leaf springs the articles being reinforcements for concrete
    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/28—Associations of cutting devices therewith
    • B21D43/285—Devices for handling elongated articles, e.g. bars, tubes or profiles

Definitions

  • the present invention relates to a plant for bending metal bars, in particular bars for reinforcing concrete, comprising:
  • a plant of the type referred to above is, for example, described in the Italian patent No. IT 1360184 , filed in the name of the present applicant.
  • the aforesaid document refers to plants of the known art in which the thrust member is constituted by a flat stop plate that is oriented perpendicular to the plane of the bending units and can be moved via appropriate means in the longitudinal direction of the bars so as to cause the bars to slide on one another in said direction in order to set them up and align them with one another.
  • IT 1360184 teaches using as thrust member the eccentric pin of one of the two bending units; this enables simplification of the overall structure of the plant and the possibility of operating also on "short" bars on which the plants that use the stop plate have instead some difficulty in operating, since this must be located at a certain distance from the bending mandrel so as not to constitute a hindrance to the bending means of the bending units.
  • the object of the present invention is to overcome the aforesaid drawback. This object is achieved via a bending plant having the characteristics specified in Claim 1.
  • FIGS 1 and 2 illustrate in an altogether schematic way a bending plant 10 of the type already known in the art.
  • Said plant comprises two bending units 2 and 4 that define a bending plane and a space for receiving a number of bars A, B, C to be bent, arranged parallel to one another and on top of one another in a plane orthogonal to the bending plane.
  • One or both of the bending units are mobile in the longitudinal direction Z of the bars received in the aforesaid receiving space in order to be able to execute bending in any desired point of the bars.
  • the plant moreover envisages a vicing apparatus 6 that keeps the metal bars still during bending and during translation of one or both of the bending units in the longitudinal direction of the bars.
  • the known plant of Figures 1 and 2 moreover envisages a stop plate 8, which is provided with a contrast surface orthogonal to the bending plane and is set in front of the ends of the bars on one side in the receiving space.
  • the stop plate 8 is designed to be moved in the direction of the bars (according to the movement S indicated in the figures) and against them to push the bars against which it goes gradually so as to bring them into a condition where they are mutually aligned with the other bars that are in the receiving space.
  • the stop plate is carried by the bending unit 2 and the action of thrust by said stop plate is obtained as a result of the movement of the unit 2 in the longitudinal direction Z.
  • the plant of the Italian patent No. IT1360184 uses, instead, the eccentric pin of the bending unit itself for exerting the action of thrust referred to above.
  • Figure 1 illustrates the bars A, B, C in a mutually misaligned condition after they have been unloaded onto the bending units via, for example, an apparatus for automatic loading of the bars.
  • the stop plate 8 is moved in the direction of the bars towards the left (as viewed in the figures). As has been mentioned above, in theory, this action should enable the bars B, C, which are displaced towards the stop plate, to be brought into the condition where they are aligned with the bar A, which is the furthest from the stop plate.
  • the thrust of the stop plate determines, on account of the friction between the bars, only a movement of all the bars together, i.e., without any change in their relative positions, so that they remain misaligned with respect to one another (see Figure 2 ).
  • the plant according to the present invention comprises a stop element that, acting on the ends of the bars opposite to the ones pushed by the stop plate, prevents the movement of all the bars together and enables the stop plate to overcome the forces of friction between the bars so as to make them slide on one another, thus obtaining their mutual alignment.
  • Figures 3 and 4 illustrate an example of embodiment of the plant according to the present invention.
  • Designated by the reference number 10' is the plant as a whole, which has the same means as the ones so far described with reference to the known plant of Figures 1 and 2 (it is to be noted that the means in common between the two plants are designated in the figures by the same reference numbers).
  • Figure 3 illustrates a set of bars A, B, C of "large" diameter, all substantially of the same length, arranged on the two bending units 2 and 4 in a mutually misaligned condition.
  • the plant 10' envisages a stop element 12 provided with a contrast surface orthogonal to the bending plane, which sets itself in front of the ends of the bars that are opposite to the ends at which the stop plate 8 is located.
  • both the stop plate and the stop element can be displaced from their respective operative positions referred to above, where they extend above the bending plane, to respective inoperative positions in which they come to be underneath the bending plane so as not to interfere with the operations of bending of the bars.
  • the stop plate 8 has the function of moving towards the bars and of pushing the ends of the bars that it encounters in its movement S.
  • the stop element 12 is instead designed to determine a force of reaction to the thrust exerted by the stop plate, which is transmitted to the bars, so as to cause the bars to slide on one another and thus obtain their mutual alignment.
  • the stop element defines a contrast surface that blocks in position the bars that come into contact therewith, whilst in the meantime the stop plate acts so as to bring also the other bars against said surface.
  • the action of thrust by the stop plate is obtained as a result of the movement S of the bending unit that carries the stop plate. It is, however, clear that as an alternative it is possible to envisage a stop plate mobile via purposely designed drive means.
  • the stop plate instead of the stop plate it is possible to use the eccentric pin of the bending unit itself.
  • the stop element may be an additional element of the bending unit, similar to the stop plate, or else the eccentric pin of the bending unit, or even any other element of said unit suited to the purposes referred to.
  • control means 20 designed to govern the movement S of the stop plate 8.
  • the control means can be configured for detecting the distance d between the stop plate and the stop element and stop the advance of the stop plate when the aforesaid distance assumes a value equal to the length L of the bars.
  • Said control modality is not, however, the preferred one in so far as it leads any possible bars of effective length greater than the nominal one to be banged against and deformed by the stop plate, since this, as has been mentioned, always moves up to a distance, with respect to the stop element, equal to the nominal length of the bars.
  • the rebars it is also to be noted that it is not rare for the rebars to be obtained with high tolerances, up to the point where they are a few centimetres longer than the nominal length, so that in these cases there is also the risk, not only of damaging the bars, but also of causing damage to the plant and/or of exposing the operator to situations of danger.
  • the stop element can be displaced in the same direction and in the same sense as the movement of the stop plate 8 when it is subjected to a force of thrust in said direction and sense that exceeds a predetermined limit value; in general, the aforesaid value must be greater than the force of friction between the bars - i.e., than the force, to be impressed on the bars by the stop plate, that is necessary to displace said bars with respect to one another as far as a mutually aligned condition - and at the same time cannot exceed - or in any case not beyond a certain range - the bending strength of the individual bars.
  • Said characteristic determines an operation where, in the condition illustrated in Figure 3 , i.e., when the bars are not yet aligned and hence exert on the stop element a force of thrust that is clearly less than the aforesaid limit value, the element 12 remains stationary and consequently acts as a stop for the bars, whereas, in the condition of Figure 4 , i.e., when the condition where the bars are aligned is reached and these are squeezed between the stop plate and the stop element, the bars push against the stop element with a force that exceeds the limit value referred to above, and the stop element then starts to move (according to the movement S' indicated in Figure 4 ).
  • control means 20 are configured for interrupting actuation of the stop plate 8 as soon as they detect the movement S' by the stop element (for example, detecting the signal coming from the encoder associated to the bending unit 4); this enables stopping of the stop plate practically immediately after the condition of mutual alignment of the bars has been reached, thus preventing the bars from being displaced from their position of loading on the plant.
  • the aforesaid limit value must not in fact exceed - or in any case not by very much - the bending strength of the individual bars, precisely to prevent the longer bar or bars that are present among the set of bars to be bent, once they are compressed between the stop plate and the stop element, from starting to undergo deformation instead of causing the aforesaid element to move.
  • the bending unit that carries said element is left in a configuration such as to be freely mobile; in this case, the value of the force of inertia opposed by the bending unit corresponds to the aforesaid limit value and is precisely such as to be greater than the force of friction between the bars and smaller (or, in any case, only slightly greater) than the bending strength of the individual bars. Consequently, in the condition illustrated in Figure 3 , the bending unit 4 remains stationary in such a way that the element 12 will act as a stop, whereas, once the condition in Figure 4 is reached, it starts to move, pushed by the stop plate 8 by means of the bars. Once the movement S' is detected, the control means 20 halt actuation of the stop plate 8. The bending units can thus immediately start the bending operations, setting themselves in predetermined points along the bars, without any need for further displacements by the latter.
  • the safety travel that the stop element performs can be obtained also according to modalities alternative to the one illustrated; for example, the stop element can be connected to a structure of the plant different from the bending unit (or to the bending unit that is blocked in the longitudinal direction of the bars) via interposition of elastic means designed to enable movement of the stop element - in the same direction and in the same sense as the movement of the stop plate 8 - only when the element itself is subjected to a force of thrust greater than the limit value indicated above.
  • the plant has been described as presenting two bending units, it is clear that these units may be different in number according to the application requirements; for example, there may be one or three of them.
  • the plant comprises a fixed stop element and control means configured for interrupting the action of the thrust member according to the electric power consumed by the drive means (or the motor means designed to move the bending unit 2) of said thrust member.
  • the control means are configured for interrupting the action of the thrust member as soon as the electric power consumed exceeds a pre-set limit value corresponding to generation of a force, by said thrust member, greater than the force necessary for overcoming the friction between one bar and another and displacing said bars up to a mutually aligned condition.
  • the control means comprise a current sensor pre-arranged for measuring the current that is supplied to the drive means (or to the aforesaid motor means).
  • the drive means are constituted by an electric actuator of a linear type, such as, for example, a brushless motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Wire Processing (AREA)
EP20130153175 2012-02-01 2013-01-30 Installation pour le cintrage de barres métalliques Active EP2623227B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000083A ITTO20120083A1 (it) 2012-02-01 2012-02-01 Impianto di piegatura di barre metalliche

Publications (2)

Publication Number Publication Date
EP2623227A1 true EP2623227A1 (fr) 2013-08-07
EP2623227B1 EP2623227B1 (fr) 2015-03-18

Family

ID=46001432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20130153175 Active EP2623227B1 (fr) 2012-02-01 2013-01-30 Installation pour le cintrage de barres métalliques

Country Status (2)

Country Link
EP (1) EP2623227B1 (fr)
IT (1) ITTO20120083A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188850A2 (fr) * 1985-01-21 1986-07-30 S.A.E. Srl Società Automatismi Elettronici Dispositif pour alimenter des barres
EP0419441A1 (fr) * 1989-09-20 1991-03-27 EVG Entwicklungs- u. Verwertungs- Gesellschaft m.b.H. Appareil de pliage pour barres de fer à béton
EP0564446A1 (fr) * 1992-04-03 1993-10-06 EVG Entwicklungs- u. Verwertungs- Gesellschaft m.b.H. Procédé et dispositif d'orientation des barres droites
EP0648577A1 (fr) * 1993-10-19 1995-04-19 OSCAM S.p.A. Appareil pour le faconnage de barres en particulier des barres pour beton armé
EP1407839A1 (fr) * 2002-10-10 2004-04-14 OSCAM S.p.A. Installation pour couper des barres métalliques
IT1360184B1 (it) * 2005-05-11 2009-05-06 Oscam Spa Procedimento per la piegatura di barre metalliche

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188850A2 (fr) * 1985-01-21 1986-07-30 S.A.E. Srl Società Automatismi Elettronici Dispositif pour alimenter des barres
EP0419441A1 (fr) * 1989-09-20 1991-03-27 EVG Entwicklungs- u. Verwertungs- Gesellschaft m.b.H. Appareil de pliage pour barres de fer à béton
EP0564446A1 (fr) * 1992-04-03 1993-10-06 EVG Entwicklungs- u. Verwertungs- Gesellschaft m.b.H. Procédé et dispositif d'orientation des barres droites
EP0648577A1 (fr) * 1993-10-19 1995-04-19 OSCAM S.p.A. Appareil pour le faconnage de barres en particulier des barres pour beton armé
EP1407839A1 (fr) * 2002-10-10 2004-04-14 OSCAM S.p.A. Installation pour couper des barres métalliques
IT1360184B1 (it) * 2005-05-11 2009-05-06 Oscam Spa Procedimento per la piegatura di barre metalliche

Also Published As

Publication number Publication date
ITTO20120083A1 (it) 2013-08-02
EP2623227B1 (fr) 2015-03-18

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