EP1199115A1 - Procédé pour cintrer des barres profilées ou analogues selon des rayons de courbure programmables - Google Patents

Procédé pour cintrer des barres profilées ou analogues selon des rayons de courbure programmables Download PDF

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Publication number
EP1199115A1
EP1199115A1 EP01124568A EP01124568A EP1199115A1 EP 1199115 A1 EP1199115 A1 EP 1199115A1 EP 01124568 A EP01124568 A EP 01124568A EP 01124568 A EP01124568 A EP 01124568A EP 1199115 A1 EP1199115 A1 EP 1199115A1
Authority
EP
European Patent Office
Prior art keywords
bending
section
curvature
eccentric
bent
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.)
Withdrawn
Application number
EP01124568A
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German (de)
English (en)
Other versions
EP1199115A8 (fr
Inventor
Simone Rupoli
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.)
Schnell SpA
Original Assignee
Schnell SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schnell SpA filed Critical Schnell SpA
Publication of EP1199115A1 publication Critical patent/EP1199115A1/fr
Publication of EP1199115A8 publication Critical patent/EP1199115A8/fr
Withdrawn legal-status Critical Current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
    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/12—Bending rods, profiles, or tubes with programme control

Definitions

  • the present invention relates to a method for bending sections and the like, particularly iron rods for reinforced concrete, according to programmable radii of curvature that are not limited by the dimensions of the tools used, and to an apparatus for performing the method.
  • shaped rods used for example to provide reinforced-concrete frames, are generally obtained by means of an apparatus that subjects the iron rod, in coils or bars, to a plurality of bending operations. More particularly, bending machines are currently known which allow to provide a large number of different products, such as open or closed stirrups, polygonal bent shapes, and the like.
  • That type of apparatus usually has at least one bending assembly with a bending head provided with a central bending tool and with an eccentric bending post.
  • the central bending tool is constituted by two bending forms 6 that also act as abutments during the bending step performed by the eccentric post 4.
  • the central bending tool 3 is constituted by a conventional cylindrical central mandrel that cooperates with a separate abutment 7 and with the eccentric bending post 4.
  • a specific problem, that occurs in the field being considered, is constituted by the need to bend the iron rods according to different radii of curvature depending on the use for which they are meant.
  • the statutory provisions currently in force require bending the rods according to relatively wide radii of curvature, in order to provide better grip with the concrete.
  • Recent studies in this field have in fact found a problem of excessive specific pressure in the concrete which entails, in particular conditions, the collapse of the material in the regions below the curves of the rods.
  • the diameter of the central bending tool is related to the diameter of the rod to be bent, and therefore the radius of curvature to be provided increases as the diameter of the rod increases.
  • the aim of the present invention is to solve the cited problem, by providing a method that allows to rapidly and simply bend sections and the like, according to radii of curvature that can be programmed in the desired manner.
  • an object of the present invention is to provide an apparatus that provides the automatic bending of sections and the like with a structure that is simple and functional, reliable in operation, and highly flexible in use.
  • the numeral 1 generally designates a bending assembly applied in a machine for bending sections 2, for example iron rods for reinforced concrete and the like, hereinafter termed rods for the sake of simplicity, although the method according to the invention can also be applied to pipes and sections of any size and shape.
  • the bending assembly 1 has, in a per se known manner, a central bending and abutment tool 3 and an eccentric bending post 4.
  • the tool 3 is conveniently constituted by a pair of bending and abutment forms 6 with a central channel, that are interchangeable and optionally adjustable according to the diameter of the rods 2 to be bent.
  • the method for bending the rods 2, according to programmable radii of curvature entails actuating the discontinuous advancement of the section 2 to be bent in abutment against the central tool 3, for example between the bending forms 6, in step with alternating and differentiated angular strokes of the eccentric bending post 4, so as to make the section 2 follow the envelope of a virtual mandrel 5 whose radius of curvature is programmable and tangent to the line along which the section 2 is fed.
  • the advancement strokes of the section 2 to be bent and the angular strokes of the eccentric bending post 4 are controlled or indicated by means of a suitable program managed by an electronic processing means, depending on the desired radius of curvature.
  • the angular strokes of the eccentric bending post 4 do not have a constant breadth but are modulated so as to approximate the envelope in an optimum manner. More particularly, the angular strokes of the post 4 increase in breadth at least in an initial part of the bending cycle.
  • Figure 17 illustrates in greater detail a portion of a rod 2 bent according to the radius of curvature defined by the virtual mandrel.
  • dark areas 12 represent, for the sake of clarity, the bending regions provided sequentially by the action of the eccentric bending post 4.
  • the above cited electronic processing means controls or indicates, by means of a suitable program, the discontinuous advancement of the rod 2 to be bent in step with the alternating and variable angular strokes of the eccentric post 4, according to the intended radius of curvature.
  • the sequence of the advancements of the rod is processed in combination with the corresponding angular strokes of the post 4, according to the radius of curvature formed by the virtual mandrel 5. More specifically, the variables to be considered are the characteristics of the central tool 3, the position of the eccentric post 4, the diameter of the section 2 being processed, the number of bends with which one wishes to approximate the desired theoretical radius of curvature, and the bending angle to be obtained on the section.
  • the channel of the central tool 3 can conveniently be adjustable or interchangeable, so as to allow to process rods having different diameters, within a certain variation range, without replacing the tool.
  • the method according to the invention therefore achieves the aim of manually or automatically bending, in a simple and rapid manner, sections and the like according to programmable radii of curvature.
  • the described method allows to obtain sections with wide radii of curvature and sections with a curvature with portions having different radii.
  • a feature of the method according to the invention is that the programmable radii of curvature are not constrained by the physical dimensions of the central tool, be it constituted by a mandrel or by bending forms with a central channel, but can have any dimensions, so long as they are larger than those of the tool.
  • the method is also versatile in use and can be implemented in bending and shaping machines and in stirrup bending machines, regardless of whether they are automatic, semiautomatic or manual machines.
  • the materials used may be any according to requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP01124568A 2000-10-16 2001-10-15 Procédé pour cintrer des barres profilées ou analogues selon des rayons de courbure programmables Withdrawn EP1199115A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO000602 2000-10-16
IT2000BO000602A ITBO20000602A1 (it) 2000-10-16 2000-10-16 Metodo e apparecchiatura per la piegatura di profilati e simili secondo raggi di curvatura programmabili

Publications (2)

Publication Number Publication Date
EP1199115A1 true EP1199115A1 (fr) 2002-04-24
EP1199115A8 EP1199115A8 (fr) 2002-07-31

Family

ID=11438792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01124568A Withdrawn EP1199115A1 (fr) 2000-10-16 2001-10-15 Procédé pour cintrer des barres profilées ou analogues selon des rayons de courbure programmables

Country Status (2)

Country Link
EP (1) EP1199115A1 (fr)
IT (1) ITBO20000602A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005061144A1 (fr) * 2003-12-24 2005-07-07 Stema Engineering A/S Procede et outil pour le cintrage de materiau en barre
WO2006055998A1 (fr) * 2004-11-24 2006-06-01 Universität für Angewandte Kunst Wien Procede d'amorçage de machines a cintrer
CN102941290A (zh) * 2012-11-16 2013-02-27 苏州汇川技术有限公司 弯箍机及弯箍机控制方法
ITMI20131272A1 (it) * 2013-07-29 2015-01-30 Crippa Spa Macchina per curvare tubi con calandra posteriore e relativo procedimento di calandratura.
CN104368658A (zh) * 2014-11-10 2015-02-25 贵州天义电器有限责任公司 一种b形零件的自动成型装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661002A (en) * 1969-10-04 1972-05-09 Peddinghaus Paul Ferd Bending machine for bending reinforcing irons for concrete
US3991600A (en) * 1974-11-15 1976-11-16 Remigio Del Fabro Stirrup machine
US4456036A (en) * 1981-11-18 1984-06-26 Oemb Sa Wire bending apparatus and a method of bending a wire
EP0334353A1 (fr) * 1988-03-25 1989-09-27 EVG Entwicklungs- u. Verwertungs- Gesellschaft m.b.H. Procédé et machine pour plier de préférence du matériel en forme de barre

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661002A (en) * 1969-10-04 1972-05-09 Peddinghaus Paul Ferd Bending machine for bending reinforcing irons for concrete
US3991600A (en) * 1974-11-15 1976-11-16 Remigio Del Fabro Stirrup machine
US3991600B1 (fr) * 1974-11-15 1984-03-20
US4456036A (en) * 1981-11-18 1984-06-26 Oemb Sa Wire bending apparatus and a method of bending a wire
EP0334353A1 (fr) * 1988-03-25 1989-09-27 EVG Entwicklungs- u. Verwertungs- Gesellschaft m.b.H. Procédé et machine pour plier de préférence du matériel en forme de barre

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005061144A1 (fr) * 2003-12-24 2005-07-07 Stema Engineering A/S Procede et outil pour le cintrage de materiau en barre
WO2006055998A1 (fr) * 2004-11-24 2006-06-01 Universität für Angewandte Kunst Wien Procede d'amorçage de machines a cintrer
CN102941290A (zh) * 2012-11-16 2013-02-27 苏州汇川技术有限公司 弯箍机及弯箍机控制方法
ITMI20131272A1 (it) * 2013-07-29 2015-01-30 Crippa Spa Macchina per curvare tubi con calandra posteriore e relativo procedimento di calandratura.
EP2832463A3 (fr) * 2013-07-29 2015-04-08 Crippa S.P.A. Machine de cintrage de tubes à calandre arrière et sa procédure de calandrage
CN104368658A (zh) * 2014-11-10 2015-02-25 贵州天义电器有限责任公司 一种b形零件的自动成型装置
CN104368658B (zh) * 2014-11-10 2017-02-22 贵州天义电器有限责任公司 一种b形零件的自动成型装置

Also Published As

Publication number Publication date
ITBO20000602A1 (it) 2002-04-16
EP1199115A8 (fr) 2002-07-31
ITBO20000602A0 (it) 2000-10-16

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