EP0648577B1 - Apparatus for shaping bars, particularly bars of reinforced concrete - Google Patents

Apparatus for shaping bars, particularly bars of reinforced concrete Download PDF

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Publication number
EP0648577B1
EP0648577B1 EP94830485A EP94830485A EP0648577B1 EP 0648577 B1 EP0648577 B1 EP 0648577B1 EP 94830485 A EP94830485 A EP 94830485A EP 94830485 A EP94830485 A EP 94830485A EP 0648577 B1 EP0648577 B1 EP 0648577B1
Authority
EP
European Patent Office
Prior art keywords
bars
bed
longitudinal direction
bending
support
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94830485A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0648577A1 (en
Inventor
Renzo Peruzzi
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 SpA
Original Assignee
Oscam SpA
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Filing date
Publication date
Application filed by Oscam SpA filed Critical Oscam SpA
Publication of EP0648577A1 publication Critical patent/EP0648577A1/en
Application granted granted Critical
Publication of EP0648577B1 publication Critical patent/EP0648577B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the present invention relates to apparatus for shaping bars, particularly bars of reinforced concrete, of the type indicated in the pre-characterizing portion of Claim 1.
  • An apparatus of this type is known from EP-A-0 419 441.
  • Another known apparatus is described and shown for example in Italian patent application No. 53304-B/87 filed on 11 May 1987 and laid open to public inspection on 11 November 1988. This apparatus has been produced and marketed by the applicant for a long time.
  • the bars to be shaped are fed above the bed and then subsequently picked up therefrom and positioned with their end portions resting on the two horizontal rotatable disks of the two bending machines.
  • the position in the longitudinal direction of the bar to be shaped with respect to the two bending machines is determined by the abutment of one end of the bar against a fixed stop element provided on one of the two bending machines.
  • the two machines are located at a distance from each other corresponding to the position of the bends to be carried out on the bar.
  • the two machines are positioned so that when the bar is laid down on the two rotatable disks of the bending machines, the two central pins of these disks are located at the bending regions.
  • the two disks are then activated simultaneously so as to carry out the two end bendings by the offset pins, whereas the portion of the bar adjacent to each end portion is prevented from moving by the central pin and said support element, which are in contact with the bar on opposite sides thereof and at two regions thereof which are spaced apart from each other.
  • the two machines are located at the corresponding distance (once the rotatable disks are returned to their starting positions) and the two disks are again activated to carry out the second bend.
  • the whole cycle of operations which has been described above is automated with the aid of a computer which automatically controls the displacement of the bending machines and the rotation of their rotatable disks as a function of a predetermined program, corresponding to the specific geometry of the shaped bar which is to be obtained.
  • the bars to be shaped were picked up from the bed and positioned above the bending machines manually. This required some effort and loss of time for the operators.
  • the bed is provided with a plurality of liftable supports which raise the bars received on the bed with respect to the plane thereof. These supports had the configuration of brackets projecting transversally to the bed in the direction of the side thereof facing the bending machines. When the supports were lifted, the operator could then obtain the positioning of the bar above the bending machines by causing the bar to roll on said supports until it fell down on the bending machine. Thus, the effort necessary for lifting the bar was avoided by the operators.
  • the apparatus known from EP-A-0 419 441 has gripping members for moving the bars but has no support elements on its bending machines so that the gripping members cannot go back to the pick-up position until bending of a bar has been completed, which causes a loss in production speed.
  • GB-A-2 169 829 provides each bending machine with two support elements on opposite sides of the bar, which is complicated and costly due to the consequential mechanism for moving back and forth the bending units as a whole.
  • the object of the present invention is that of providing an apparatus which keeps all the advantages of the known apparatus described above and which at the same time is able to solve all the above mentioned inconveniences satisfactorily.
  • the invention provides an apparatus for shaping bars, particularly bars of reinforced concrete, having the features indicated in Claim 1.
  • a further gripping member is associated with a fixed structure arranged between the two bending machines, so that the bars are always gripped at three regions through their length.
  • the bar support means are preferably comprised of brackets projecting from the side of the bed facing the bending machines and movable along the longitudinal direction of the bed.
  • the movement of said brackets is driven by any device of known type and is controlled by a computer, with the aid of position sensing devices, on the basis of the features of the bars to be shaped.
  • one of said support brackets is also provided with an abutment plane for the ends of the bars, which defines a reference plane for the proper positioning of the bars along the longitudinal direction.
  • the positioning of the bracket carrying this plane is also automatically controlled by the computer, with the aid of a position sensing device. In this manner, it is possible to eliminate the reference plane provided, according to the prior art, on one of the two bending machines and no manual measuring operations are necessary any longer to position said reference plane properly.
  • reference numeral 1 generally designates a bed having an upper planar surface 2 which is for receiving a plurality of bars 3.
  • the surface 2 may be provided with rollers to make the longitudinal advancing movement of the bars 3 on the bed when they are fed thereto.
  • the embodiment shown relates to the case in which both bending machines 4 are movable.
  • the invention is theoretically applicable even to the case in which one of the two bending machines is fixed, since what is essential is the possibility to adjust the distance between the two machines 3.
  • each bending machine 4 comprises an upper planar surface 6 on which there is arranged a driven rotatable horizontal disk 7 having a central pin 8 and an offset pin 9, as well as a flat support element 10 which is able to assume two different operating positions, both adjustable, on the upper planar surface 6, as it will be described in detail in the following.
  • brackets 12, 13 adjustable in position along the longitudinal direction of the bed and a support bracket 14 fixed to the bed at the central region thereof. All said support brackets have vertical slots 12a, 13a, 14a opened upwardly, aligned with each other and adapted to receive and support one or more bars 3 superimposed on each other in a vertical plane parallel to the longitudinal direction of the bed.
  • the upper surfaces of brackets 12, 13, 14 are arranged in the same plane, or in a plane lowered with respect to the upper planar surface 2 of the bed, so that bars 3 may be loaded in the slots 12a, 13a, and 14a by making them roll on the planar surface 2 until they fall down within said slots.
  • the support brackets 12 and 13 are adjustable in position to adapt to different possible lengths of bar 3, whereas one of the two brackets 13, and precisely that arranged closer to the corresponding end of bed 1 is also provided with a reference plate 13b transverse to the longitudinal direction of the bed 1, which is to define a reference for one end of the bars, so to allow the proper positioning along the longitudinal direction of the bars on the support brackets.
  • each bending machine 4 is provided, on its side facing the other bending machine 4 with a support structure 15, fixed to the frame of the bending machine and provided with rails (not shown) for a carriage 16 movable with respect to the support structure 15 along a horizontal direction transverse to the longitudinal direction of bed 1.
  • the movement of carriage 16 is driven by a chain 17 (shown only diagrammatically in figure 2) which is controlled by an electric motor.
  • the electric motors which driven all the movements of the various parts of the apparatus are controlled by a computer on the basis of a predetermined program which is defined as a function of the particular geometry to be given to the shaped bar. This applies of course also to the electric motor (not shown) which drives the chain 17.
  • angular position sensing devices which are able to supply an electronic control unit with the information on the position reached by each movable part.
  • FIG. 3 diagrammatically shows the path followed by slide 19 in an operating cycle.
  • Position 1 is the position assumed immediately before that the bars are picked up from the support brackets 12, 13, 14.
  • Position 2 is that reached as a result of the lifting movement of slide 19 by which the latter picks up the bars from support brackets 12, 13, 14.
  • Position 3 is that assumed as a result of the movement along a direction transverse to the longitudinal direction of the bars and position 4 is that for unloading the bars above the bending machines.
  • the fixed support element 10 is displaceable along a direction 50 so that it can assume two different operating positions located on opposite sides with respect to a plane including the axes of the two rotatable disks 7 of the two bending machines 4.
  • the bending machines may be arranged to carry out bendings in both directions without requiring a rotation of the bars around their axes over 180 degrees once a bending in one direction has been carried out, in order to carry out a bending in the opposite direction.
  • This feature which will become even more apparent from the following description with reference to figures 5A-5E, which show a bar bending cycle, becomes extremely advantageous when one wishes to bend simultaneously many bars superimposed on each other.
  • each of said two operating positions is adjustable to allow adaptation to different diameters of the fixed pin.
  • an originally linear bar (or more bars superimposed on each other) is/are arranged on the two bending machines 4 which are activated to carry out the first end bends, at 90 degrees, at the end portions 3a.
  • the rotatable disks 7 are brought again in their starting position and the bending machines 4 are moved closer in the position shown in figure 5B to carry out a second bend and 90 degrees of a second portion 3b adjacent to each end portion 3a.
  • a third bend which is carried out in the same direction at two further portions 3c of the bar adjacent to the portions 3b and displaced towards the center of the bar with respect to portion 3b.
  • the gripping members formed by slides 19 are again activated to pick up the bar or bars 3 from the rotatable disks 7 and to lift them over the latter.
  • the support elements 10 are positioned in positions symmetrical with respect to said plane including the axes of the two rotatable disks and the latter are arranged in the positions adapted to carry out the bend in the opposite direction, as shown in figure 5D.
  • shapes of the type shown in figure 5E which have bends in the two opposite directions, do not require the operator to rotate the bar around its axis over 180 degrees once the bends in a same direction have been carried out, before carrying out the bends in the opposite direction.
  • the preferred embodiment of the invention which is described herein, also comprises a third slide 19 which is exactly similar to slides 19 associated with the two bending machines 4, but is guided on a support structure 30 fixed to the bed 11 in a central position with respect to the length thereof.
  • the apparatus allows an automatic and rapid loading of the bars to be shaped on the bending machines without requiring the manual intervention of the apparatus and nullifying the dead times which are typical of the known apparatus.
  • the apparatus is also able to perform bendings in opposite directions on a same bar without requiring the intervention of the operator and without requiring a rotation of the bar around its axis during the operating cycle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Wire Processing (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
EP94830485A 1993-10-19 1994-10-13 Apparatus for shaping bars, particularly bars of reinforced concrete Expired - Lifetime EP0648577B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO930774 1993-10-19
ITTO930774A IT1260998B (it) 1993-10-19 1993-10-19 Impianto per la sagomatura di barre, particolarmente barre di cemento armato.

Publications (2)

Publication Number Publication Date
EP0648577A1 EP0648577A1 (en) 1995-04-19
EP0648577B1 true EP0648577B1 (en) 1997-03-26

Family

ID=11411810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94830485A Expired - Lifetime EP0648577B1 (en) 1993-10-19 1994-10-13 Apparatus for shaping bars, particularly bars of reinforced concrete

Country Status (4)

Country Link
EP (1) EP0648577B1 (es)
DE (1) DE69402284T2 (es)
ES (1) ES2101477T3 (es)
IT (1) IT1260998B (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001091936A1 (en) * 2000-05-31 2001-12-06 Natsteel Technology Investments Pte Ltd. Automated bar bender

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1288751B1 (it) * 1996-10-11 1998-09-24 Lorenzo Peruzzo Impianto per tagliare e sagomare barre di acciaio, particolarmente barre per l'armatura di cemento
IT1320809B1 (it) * 2000-08-29 2003-12-10 Oscam Spa Macchina per la piegatura di barre metalliche, con piano d'appoggio alunghezza variabile.
IT1399415B1 (it) * 2010-04-12 2013-04-16 Oscam Spa Impianto per la piegatura di barre metalliche con caricamento automatico delle barre, e metodo di caricamento utilizzato in tale impianto.
JP5692714B2 (ja) * 2010-05-12 2015-04-01 株式会社キャダック 鉄筋の曲げ加工装置
ITTO20120083A1 (it) * 2012-02-01 2013-08-02 Oscam Spa Impianto di piegatura di barre metalliche
EP2908962B1 (en) 2012-09-21 2016-11-09 Schnell S.p.A. Method and apparatus for folding metal rods in bars
ITBO20130159A1 (it) * 2013-04-10 2014-10-11 Dante Bruno Priuli Metodo e apparecchiatura per la piegatura di profilati metallici in barre
ITBO20120505A1 (it) * 2012-09-21 2014-03-22 Dante Bruno Priuli Apparecchiatura per la piegatura di profilati metallici in barre
BG67466B1 (bg) * 2019-10-10 2022-10-17 Тодоров Киров Валентин Автоматична машина и метод за производство на арматурни заготовки
CN111872182B (zh) * 2020-07-25 2022-05-03 浙江省东阳第三建筑工程有限公司 一种建筑施工用的液压弯管机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55126326A (en) * 1979-03-23 1980-09-30 Kajima Corp Method and apparatus for manufacturing steel bar for use of reinforced concrete
US4681210A (en) * 1984-08-23 1987-07-21 Kabushiki Kaisha Komatsu Seisakusho Apparatus for feeding bars through a bending or like processing station
US4662204A (en) * 1985-01-17 1987-05-05 Usui Kokusai Sangyo Kabushiki Kaisha Apparatus for automatically bending metallic tubes
IT210698Z2 (it) * 1987-05-11 1989-01-11 Oscam Spa Macchina per la piegatura di tondini o simili elementi metallici
JPH04501825A (ja) * 1989-09-20 1992-04-02 エー　ファウ　ゲー　エントヴィックルングス―　ウント　フェルヴェルツングス―ゲゼルシャフト　ミット　ベシュレンクテル　ハフツング 鋼ロッドを曲げてコンクリート補強部材を製造する装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001091936A1 (en) * 2000-05-31 2001-12-06 Natsteel Technology Investments Pte Ltd. Automated bar bender
SG99308A1 (en) * 2000-05-31 2003-10-27 Natsteel Technology Invest Pte Automated bar bender

Also Published As

Publication number Publication date
DE69402284D1 (de) 1997-04-30
ES2101477T3 (es) 1997-07-01
ITTO930774A1 (it) 1995-04-19
IT1260998B (it) 1996-04-29
EP0648577A1 (en) 1995-04-19
DE69402284T2 (de) 1997-10-09
ITTO930774A0 (it) 1993-10-19

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