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WO1999026739A1 - Machine de cintrage comportant differents outils de cintrage - Google Patents

Machine de cintrage comportant differents outils de cintrage Download PDF

Info

Publication number
WO1999026739A1
WO1999026739A1 PCT/IB1998/001864 IB9801864W WO9926739A1 WO 1999026739 A1 WO1999026739 A1 WO 1999026739A1 IB 9801864 W IB9801864 W IB 9801864W WO 9926739 A1 WO9926739 A1 WO 9926739A1
Authority
WO
WIPO (PCT)
Prior art keywords
bending
work plane
rotary plate
tool
machine
Prior art date
Application number
PCT/IB1998/001864
Other languages
English (en)
Inventor
Giorgio Del Fabro
Marcello Del Fabro
Original Assignee
M.E.P. Macchine Elettroniche Piegatrici S.P.A.
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 M.E.P. Macchine Elettroniche Piegatrici S.P.A. filed Critical M.E.P. Macchine Elettroniche Piegatrici S.P.A.
Priority to EP98952976A priority Critical patent/EP1034052A1/fr
Priority to BR9815050-2A priority patent/BR9815050A/pt
Priority to AU10493/99A priority patent/AU1049399A/en
Publication of WO1999026739A1 publication Critical patent/WO1999026739A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F1/00—Bending wire other than coiling; Straightening wire
    • 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

  • This invention concerns a bending machine with variable bending tool as set forth in the main claim.
  • the bending machine according to the invention is applied in the bending and shaping of metallic profiles, particularly but not only round pieces used for reinforcement purposes in reinforced concrete buildings.
  • metallic profiles particularly but not only round pieces used for reinforcement purposes in reinforced concrete buildings.
  • round pieces for reinforcement purposes with a diameter which may reach up to 30 mm and more.
  • the state of the art includes bending machines for round pieces used for reinforcement purposes; these machines comprise at least a drawing assembly associated with at least a bending assembly and a shearing assembly, and are employed to make reinforcement stirrups and/or rods which are shaped according to pre-defined angular or polygonal shapes .
  • the drawing assembly normally includes at least a drawing device consisting of one or more pairs of counter-rotating rolls, aligned on an axis which is orthogonal to the direction of feed of the round piece, or by drawing grippers which can be moved along the axis of feed of the round pieces to be bent.
  • the drawing assembly normally also comprises straightening means located upstream, downstream or both upstream and downstream of the drawing device .
  • the bending assembly normally consists of a plate, associated with the relative rotation means, which includes a bending pin in a peripheral position and, in a substantially central position, an abutment pin on the axis of which the plate usually rotates.
  • the radius of curvature of the bends which can be made on round pieces to be used as reinforcement elements in buildings made of reinforced concrete must not be less than a value correlated to the diameter of the round piece itself.
  • this radius of curvature cannot have too high a value either, since this would entail an excessive rounding of the stirrup or a change in shape of the rod, making the stirrup or rod substantially unusable or in any case geometrically unsuitable for the structure to which they have to be applied. Due to these legislative limitations concerning the radius of curvature of the round pieces used for building purposes, it is not possible, because of the physical dimensions of the abutment pin, to use a single bending assembly to perform every type of bending operation as the diameter of the rods to be bent varies.
  • bending machines as are known to the art usually adopt bending assemblies of a type which can be disassembled from the bending machine, so that they can be replaced according to the diameter of the round pieces to be bent .
  • Some bending machines include bending assemblies where only the abutment pins can be replaced.
  • the first factor is that bending machines must be able to perform consecutive left- and right-hand bends on the round pieces positioned on the work surface, and therefore it must be possible to position the bending disk with the bending pin on one side and the round pieces on the other side, without interruptions to the cycle or manual intervention.
  • the bending assembly which substantially defines the work plane in the bending zone, is connected to a plate, and it must be possible to translate this whole plate orthogonally to the axis of the round pieces in order to adapt the position of the central pin, when the diameter is changed, to the axis of the round piece .
  • the table supports a plurality of bending assemblies, each including a respective abutment pin and a respective bending pin each having their own specific diameter.
  • the specific bending assembly selected according to the diameter of the round piece to be bent and/or the type of bends to be made is first taken to the correct working position by rotating the table, and then it is lifted by specific lifting means so as to be taken to the level of the plane of feed of the round pieces.
  • Each plate is directly associated with the gear drive element suitable to make it rotate in order to perform the bending cycles.
  • the purpose of the invention is to obtain a bending machine which will shape round pieces for use as reinforcement elements in the best possible manner and in accordance with the legal requirements concerning the radius of curvature, without needing a store of abutment pins or bending assemblies to replace every time the diameter of the round piece to be shaped is varied.
  • Another purpose of the invention is to reduce the periods of inactivity of the bending machine and thus considerably improve the productivity and efficiency thereof.
  • the bending machine comprises at least a drawing assembly, at least a shearing assembly and at least a bending device comprising a plurality of bending tools which can be selected individually and selectively and each of which includes an abutment pin of a different diameter.
  • the bending machine comprises two or more bending devices, for example one arranged upstream and one arranged downstream of the drawing assembly.
  • each bending tool is used in the shaping of round pieces for reinforcement purposes of a defined range of diameters.
  • each bending tool is used in the execution of a defined range of bends on the same round piece.
  • Each of the bending tools consists of a plate-type support on which the bending pin and the abutment pin are mounted, and is assembled on the periphery of a rotary positioning device which lies below the work plane.
  • the positioning device is suitable to rotate around an axis substantially parallel to the plane of feed of the round pieces to be bent so as to allow the angular movement of the bending tools, on a plane substantially orthogonal to the plane of feed, until they are in a position wherein they can be raised to assume an active position substantially lying on the work plane of the bending machine and wherein both the pins, the bending pin and the abutment pin, position themselves astride the round pieces to be bent .
  • the specific bending tool selected is made to pass to the active position by raising the entire positioning device.
  • the bending tool selected for the specific bending cycle is constrained to a rotary plate, substantially complanar with the work plane, which causes it to rotate so that the bends may be made on the round piece.
  • the rotary plate has an insertion seating of a shape mating with that of the plate-type support of the bending tool .
  • Movement is transmitted to the rotary plate by its periphery, by means of belt means, chain means or gears.
  • this invention therefore, it is not necessary to include any drive or motor element below the work plane inasmuch as, once the specific bending tool selected has been positioned in the working position, the movement of the rotary bending plate takes place in a perfectly conventional manner with peripheral drive means such as are known in the state of the art .
  • the invention therefore does not change the bending assembly in its entirety, but allows to replace only the bending tool inserted inside a bending plate which is otherwise conventional both in its structure and in its relative drive mechanisms.
  • each bending tool may also assume a vertically intermediate position between the predetermined selection position, lowered and angular, and the raised operating position wherein the bending tool is constrained to the rotary plate.
  • the intermediate position is located at a level beneath the work plane, so as not to interfere with the round piece passing through and is assumed by the bending tool when the direction of bending has to be changed, from right to left or vice versa.
  • the bending tool In the intermediate position, the bending tool can be made to rotate solid with the rotary plate without interfering with the round pieces; this causes the reciprocal position of the bending pin and the abutment pin to be inverted with respect to the round piece to be shaped.
  • Fig. 1 shows in diagram form and in section a part of the bending machine according to the invention during the step when the bending assembly is replaced;
  • Fig. 2 shows the bending machine as in Fig. 1 during the step when the position of the bending assembly is inverted;
  • Fig. 3 shows the bending machine under operating conditions;
  • Fig. 4 shows the bending machine according to the invention in diagram form and from above;
  • Figs. 5 and 6 show two variants of the invention.
  • the reference number 10 denotes generally the bending machine according to the invention, shown in diagram form and in part .
  • the bending machine 10 comprises a drawing assembly with a drawing device 11 including counter-rotating rolls 15 to feed forward on its axis the round piece 16 to be shaped (Fig. 4) .
  • Round piece 16 should be taken to include a bundle of round pieces .
  • drawing assembly consists of drawing grippers which can move on their axis with a to-and-fro movement .
  • the bending machine 10 also comprises a bending device 32 comprising a rotary plate 20, arranged complanar with the plane of feed 17 of the round pieces 16, suitable to cooperate with a plurality of bending tools 12 assembled peripherally on an angular positioning device, in this case a rotary drum 14, arranged entirely below the plane of feed 17.
  • a bending device 32 comprising a rotary plate 20, arranged complanar with the plane of feed 17 of the round pieces 16, suitable to cooperate with a plurality of bending tools 12 assembled peripherally on an angular positioning device, in this case a rotary drum 14, arranged entirely below the plane of feed 17.
  • bending tools 12 assembled on the drum 14, arranged symmetrically at 90° one from the other.
  • the center of rotation of the drum 14 lies on the vertical plane substantially orthogonal to the work plane 17 and containing the longitudinal axis of the round piece 16.
  • the drum 14 rotates around an axis, in this case horizontal, substantially parallel to the work plane 17.
  • Each of the bending tools 12 comprises a support 13, in this case square, on which a bending pin 18a and a mating abutment pin 18b are mounted, each having its own defined diameter.
  • the support 13 is shaped to mate with a seating 21 to be found substantially centrally on the rotary plate 20.
  • Rotatory motion is transmitted to the rotary plate 20 during the bending step by its periphery, in a substantially conventional manner, by gear means 31.
  • the rotary plate 20 is guided in its rotation on the work plane, in this case, by guide wheels 22 or by a guide ring. According to a variant which is not shown here, the rotary plate 20 is moved peripherally by belt means or chain means.
  • the bending tools 12 are attached to the rotary drum 14 by means of constraining pins 19.
  • the constraining pins 19 cooperate with means which are not shown here which prevent any angular displacement, or any movement whatsoever, of the support 13 during the rotation of the drum 14, but allows the support 13 to rotate when, in its operating position, it is made solid with the rotary plate 20.
  • the bending tools 12 each have an abutment pin 18b of a different diameter which is employed to shape a defined range of diameters of round pieces 16.
  • the rotary drum 14 is mounted on a bearing frame 26 which is supported by a plate 27, arranged complanar with the work plane; the rotary plate 20 is located in an aperture of the plate 27.
  • the wheels 22 which guide the rotary plate 20 in its rotation are mounted on the said plate 27.
  • the rotary drum 14 is vertically movable with respect to the bearing frame 26 by means of lifting means 23 defined by at least an actuator 24 and associated with movement blocks 25.
  • the supports 13 can be inserted inside the central seating 21, thus defining a locking connection of the supports 13 and the rotary plate 20; it is thus possible to make the bending tools 12 temporally solid with the plate 20 so that the bends can be made on the round piece 16 to be shaped. Moreover, this connection does not cause any gaps or interstices inside which dust or waste generated during the bending cycles can infiltrate.
  • the rotary plate 20 has a lead-in bevel 30 on the lower part which facilitates the insertion and lock- in connection of the bending tools 12 selected on each occasion according to the diameter of the round pieces to be bent and/or the type of bends to be made.
  • the bending tools 12 are all underneath the rotary plate 20 in a non-operative position (Fig. 1).
  • the procedure is as follows: the drum 14 is rotated until the specific bending tool 12 selected is taken to a position defined angularly and exactly below the central seating 21.
  • the bending tool 12 is then inserted, in its operating position, into the central seating 21 and is coupled with the rotary plate 20 so as to form a single body therewith; it is then made to rotate by the rotary plate 20 so as to make the bends on the round piece 16 (Fig. 3) .
  • the insertion of the bending tool 12 is obtained by moving the drum 14 upwards by means of the lifting means 23.
  • the drum 14 is partly lowered with respect to the work plane 17, thus taking the bending tool 12 to an intermediate position wherein it is still coupled with the rotary plate 20, but is in a position underneath the work plane 17 so that it does not come into contact with the round piece 16 (Fig. 2) .
  • the bending tool 12 is made to rotate to the desired positioning of the bending pin 18a and the abutment pin 18b; it is subsequently returned to the operating position so that further bends may be made on the round piece 16 by means of lifting the drum 14.
  • the drum 14 When it is desired to replace the bending tool the drum 14 is lowered until any contact between the support 13 and the rotary plate 20 is eliminated; the drum 14 then rotates until it positions the selected bending tool 12 angularly.
  • the plate 27 is associated with an actuator 28 which allows it to move orthogonally to the direction of feed of the round piece 16, thus making it possible to adapt the position of the central abutment pin 18b with respect to the round piece 16 to the variable diameter of the said central pin 18b.
  • a bending tool 12a has not only the bending pin 18a and the abutment pin 18b but also a shears element 33 which can be used during or at the end of the bending cycle so as to shear the round piece 16 or the shaped and finished piece.
  • Fig. 5 also shows the variant wherein a specific shearing tool 133 is peripherally assembled on the rotary drum 14; the shearing tool 133 is assembled on a relative support 13 and is taken to the operating position cooperating with the rotary plate 20 instead of a bending tool 12 and in the same manner thereas, in order to perform any desired shearing operations on the round piece 16.
  • Fig. 5 also shows how it is possible to assemble five or more bending tools 12 on the drum 14 according to their size and the space available.
  • Fig. 6 shows a further variant which provides to assemble on the plate 27 shears elements 33 which can be selectively retracted and used to perform specific shearing operations on the round piece 16 which is to be bent or has already been bent .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

L'invention concerne une machine de cintrage comprenant différents outils de cintrage pour pièces rondes (16) ou faisceaux de pièces rondes. Ladite machine comprend un plan de travail (17), au moins un ensemble d'étirage (11), au moins un ensemble de cisaillement et au moins un dispositif de cintrage (32). Ce dispositif de cintrage (32) comprend une plaque rotative (20) qui repose sur le plan de travail (17) et qui est associée à un dispositif (31) pouvant la faire tourner de façon sélective. Ce dispositif de cintrage (32) comprend également une pluralité d'outils de cintrage qui peuvent être sélectionnés et comprenant chacun au moins un axe de cintrage (18a) et un axe de butée (18b) montés sur un support (13) et présentant chacun un diamètre défini, lesdits outils de cintrage (12) étant montés sur la périphérie d'un dispositif de positionnement (14) se trouvant en dessous du plan de travail (17) de la machine de cintrage (10) et tournant autour d'un axe sensiblement parallèle au plan de travail (17) de façon à positionner angulairement l'outil de cintrage (12) spécifique sélectionné. La plaque rotative (20) présente un siège d'insertion (21) dont la forme correspond à celle du support (13), dans lequel l'outil de cintrage (12) spécifique sélectionné peut être inséré par soulèvement en direction du plan de travail (17), de façon à former un corps unique avec la plaque rotative (20).
PCT/IB1998/001864 1997-11-26 1998-11-23 Machine de cintrage comportant differents outils de cintrage WO1999026739A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP98952976A EP1034052A1 (fr) 1997-11-26 1998-11-23 Machine de cintrage comportant differents outils de cintrage
BR9815050-2A BR9815050A (pt) 1997-11-26 1998-11-23 Máquina dobradeira com ferramenta de dobragem variável.
AU10493/99A AU1049399A (en) 1997-11-26 1998-11-23 Bending machine with variable bending tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD97A000220 1997-11-26
ITUD970220 IT1296722B1 (it) 1997-11-26 1997-11-26 Macchina piegatrice a gruppo piegatore variabile

Publications (1)

Publication Number Publication Date
WO1999026739A1 true WO1999026739A1 (fr) 1999-06-03

Family

ID=11422512

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1998/001864 WO1999026739A1 (fr) 1997-11-26 1998-11-23 Machine de cintrage comportant differents outils de cintrage

Country Status (5)

Country Link
EP (1) EP1034052A1 (fr)
AU (1) AU1049399A (fr)
BR (1) BR9815050A (fr)
IT (1) IT1296722B1 (fr)
WO (1) WO1999026739A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2815893A1 (fr) * 2000-10-31 2002-05-03 Macsoft Dispositif de changement d'outil rapide et automatise a support d'outil conique standard pour machine de cambrage a commande numerique
US6813922B2 (en) 2000-04-03 2004-11-09 Numalliance Bending machine for rods with resettable folding shank
EP1579930A1 (fr) * 2004-02-25 2005-09-28 OMES OFFICINE MECCANICHE Srl Machine à cintrer des barres
EP2543452A1 (fr) * 2011-07-08 2013-01-09 WAFIOS Aktiengesellschaft Dispositif de pliage pour pièces usinées en forme de tige
JP2015145025A (ja) * 2014-02-04 2015-08-13 新興機械工業株式会社 曲げ装置及びばね製造機
IT202200010457A1 (it) * 2022-05-19 2023-11-19 Schnell Spa Apparecchiatura per la lavorazione di elementi metallici di foggia allungata

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172229A (en) * 1985-03-12 1986-09-17 Alpha Maschinenbau Ag Bending apparatus with bending cores on a turret
EP0379029A1 (fr) * 1989-01-18 1990-07-25 M.E.P. Macchine Elettroniche Piegatrici S.p.A. Cintreuse pivotable
EP0517637A1 (fr) * 1991-06-06 1992-12-09 LATOUR & FILS Tête de cambrage à outils multiples pour machine à cambrer les fils métalliques
EP0519865A1 (fr) * 1991-06-18 1992-12-23 Max Mitschjeta Ag Dispositif pour cintrer du fil ou analogue

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172229A (en) * 1985-03-12 1986-09-17 Alpha Maschinenbau Ag Bending apparatus with bending cores on a turret
EP0379029A1 (fr) * 1989-01-18 1990-07-25 M.E.P. Macchine Elettroniche Piegatrici S.p.A. Cintreuse pivotable
EP0517637A1 (fr) * 1991-06-06 1992-12-09 LATOUR & FILS Tête de cambrage à outils multiples pour machine à cambrer les fils métalliques
EP0519865A1 (fr) * 1991-06-18 1992-12-23 Max Mitschjeta Ag Dispositif pour cintrer du fil ou analogue

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6813922B2 (en) 2000-04-03 2004-11-09 Numalliance Bending machine for rods with resettable folding shank
FR2815893A1 (fr) * 2000-10-31 2002-05-03 Macsoft Dispositif de changement d'outil rapide et automatise a support d'outil conique standard pour machine de cambrage a commande numerique
WO2002036280A1 (fr) * 2000-10-31 2002-05-10 MACSOFT (Société Anonyme) Dispositif de changement d'outil rapide et automatise a support d'outil conique standard pour machine de cambrage a commande numerique
US7124486B2 (en) 2000-10-31 2006-10-24 Macsoft. S.A. Fast and automated tool-changing device with standard conical tool support for digitally controlled bending machine
EP1579930A1 (fr) * 2004-02-25 2005-09-28 OMES OFFICINE MECCANICHE Srl Machine à cintrer des barres
EP2543452A1 (fr) * 2011-07-08 2013-01-09 WAFIOS Aktiengesellschaft Dispositif de pliage pour pièces usinées en forme de tige
US9067255B2 (en) 2011-07-08 2015-06-30 Wafios Aktiengesellschaft Bending apparatus for rod-shaped workpieces
JP2015145025A (ja) * 2014-02-04 2015-08-13 新興機械工業株式会社 曲げ装置及びばね製造機
US9682417B2 (en) 2014-02-04 2017-06-20 Shinko Machinery Co., Ltd. Bending device and spring manufacturing machine
IT202200010457A1 (it) * 2022-05-19 2023-11-19 Schnell Spa Apparecchiatura per la lavorazione di elementi metallici di foggia allungata
WO2023223368A1 (fr) * 2022-05-19 2023-11-23 Schnell S.P.A. Appareil et procédé pour usiner des éléments métalliques allongés

Also Published As

Publication number Publication date
EP1034052A1 (fr) 2000-09-13
IT1296722B1 (it) 1999-07-15
ITUD970220A1 (it) 1999-05-26
AU1049399A (en) 1999-06-15
BR9815050A (pt) 2000-10-03

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