EP1247594B1 - Verfahren zum Biegen von Profilstäben und Vorrichtung zur Durchführung dieses Verfahrens - Google Patents

Verfahren zum Biegen von Profilstäben und Vorrichtung zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP1247594B1
EP1247594B1 EP02007704A EP02007704A EP1247594B1 EP 1247594 B1 EP1247594 B1 EP 1247594B1 EP 02007704 A EP02007704 A EP 02007704A EP 02007704 A EP02007704 A EP 02007704A EP 1247594 B1 EP1247594 B1 EP 1247594B1
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EP
European Patent Office
Prior art keywords
bars
assembly
bending
end portion
driving
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
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EP02007704A
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English (en)
French (fr)
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EP1247594A3 (de
EP1247594A2 (de
Inventor
Gianfranco Terenzi
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Schnell SpA
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Schnell SpA
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Publication date
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Publication of EP1247594A3 publication Critical patent/EP1247594A3/de
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Publication of EP1247594B1 publication Critical patent/EP1247594B1/de
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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
    • B21D11/10—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 a processing method performed in machines for the automatic bending of metal profiles in bar form, particularly iron rods for reinforced concrete, and to a machine for performing the method.
  • shaped rods used for example to produce reinforced-concrete frames, are generally obtained by means of machines that subject the iron rod, in coil or bar form, to a series of bending operations.
  • various bending machines which allow to produce the finished products, such as stirrups and shaped rods, starting from metal profiles in bar form.
  • These bending machines generally have a series of devices for driving the bars along a feed line, an assembly for cropping the bars in order to obtain the rods to be bent, cut to size, and one or more bending assemblies arranged in series.
  • the finished products are unloaded onto the ground.
  • the method of processing metal profiles in bar form does not have the diameter and availability limitations typical of material in coils, but it has the drawback of considerable waste.
  • a series of rods to be used directly or to be bent is in fact obtained from the individual bars by means of successive cropping steps, but the end portion of the bars, which is often quite long, is wasted.
  • FR-A-2 704 784 discloses an installation for bending bars, in particular concrete bars, having a feed line for the bars to be bent along which there are arranged in succession: driving devices for unwinding the bars from a reel; a cropping assembly; and two bending heads which can slide along a guiding mechanism, in order to bend at least one bar at various points.
  • a retaining device which can also slide, is disposed between the two sliding bending heads on the feed line, in order to retain the bar or bars.
  • a control device controls the position of the movable head along the direction of the feed line, which position remaining the same throughout all the bending operations on one and the same bar or on a group of bars bent simultaneously.
  • EP-A-0 538 595 discloses a bending-shaping machine having multiple working levels, with a bending unit located downstream of an assembly that draws and/or straightens sections, a shearing unit being interposed between the bending unit and the drawing assembly, and a drawing unit being disposed downstream of the bending unit and having a first normal working position and a second downwardly retracted position, and the bending unit having a third raised working position.
  • the aim of the present invention is to solve the above cited problem, by providing a processing method that avoids having a non-workable portion of metal profiles in bar form in machines for processing these profiles, particularly allowing full workability of the end portion of the bars in order to obtain an additional shaped article or a larger one.
  • An object of the present invention is to provide a machine that performs the automatic bending of metal profiles in bar form with a structure that is simple and functional, safely reliable in operation, and highly flexible in use.
  • the reference numeral 1 generally designates the machine for bending metal profiles 2 in bar form, for example iron rods for reinforced concrete and the like.
  • the machine has a line 3 for feeding the bars 2 to be bent, along which the driving devices 4, protected by a covering housing 48, are arranged.
  • the driving devices 4 have a first driving assembly 41 and a second driving assembly 42, which are arranged in series and are preferably constituted by pairs of counter-rotating wheels 43 which preferably have identical characteristics.
  • the driving assemblies 41 and 42 are actuated by a single motor 40 arranged in a central position between the driving assemblies.
  • the driving assemblies 41 and 42 are actuated by respective chain-type transmission members 44 and 45, which wind around a double pinion 46 mounted on the output shaft of the motor 40 and around a respective pinion 47 of a wheel 43 of each driving assembly.
  • a cropping assembly 5 which can be a conventional and per se know cropping assembly.
  • the bending machine then has, in front of the cropping assembly 5, a bending assembly 6 provided with a bending head 7 of a known type, which is suitable to bend the bars 2.
  • the bending head 7 of the bending assembly 6 can move between a first upper bending station 61, arranged at the feed line 3, and a second lower bending station 62, as described in detail in Italian Patent No. 1292692 to Schnell S.p.A. Otherwise, there are two bending heads, an upper one and a lower one, which are respectively arranged at the bending stations 61 and 62.
  • the bending machine Downstream of the bending assembly 6, along the line 3 for feeding the bars 2, the bending machine has an extraction assembly 8, which is adapted to grip, during an operating step, the portion of the bars 2 that protrudes forward from the bending assembly 6. More particularly, as detailed hereinafter, the extraction assembly 8 is adapted to extract the end portion of the bars 2.
  • the extraction assembly 8 has a clamp-type grip device 9, which can move with a reciprocating motion under the actuation of a first actuator 10 along an axis that is longitudinal with respect to the advancement direction of the bars 2 ( Figure 3 ).
  • the stroke of the clamp-type grip device 9 is controlled by virtue of suitable measurement devices of a known type, which are not shown.
  • the clamp 9 can furthermore move, on the working plane and along an axis that is perpendicular to the advancement direction of the bars 2, under the actuation of a second actuator 11, between an upper position and a lower position, which correspond respectively to the first bending station 61 and the second bending station 62.
  • the clamp 9 is constituted by a lower fixed jaw 91, which is rigidly coupled to a frame 90, and by a movable jaw 92, which is suitable to be actuated by a corresponding actuator 93, which is in turn rigidly coupled to the frame 90 ( Figure 3 ).
  • the first actuator 10 is rigidly coupled to a structure 80, which forms a pair of sleeves 81 in which respective guiding stems 82 are slidingly mounted.
  • the axis of the stems is parallel to the actuator 10 ( Figure 4 ).
  • the guiding stems 82 support, at a rear end, a box 84 on which the frame 90 of the clamp 9 is guided.
  • the structure 80 is mounted so that it can slide on a pair of columns 83, which are rigidly coupled to the fixed framework of the machine, with an axis that is perpendicular to the feed direction of the bars 2, and is actuated, with a reciprocating motion, by the second actuator 11.
  • the box 84 is provided with sleeves 85 in which two additional guiding stems 86 are slidingly inserted and support, at one end, the frame 90 of the clamp 9.
  • the frame 90 of the clamp 9 can move, with a reciprocating motion, along an axis that is transverse to the feed direction of the bars 2 and to the working plane of the machine, under the actuation of a third actuator 87, which is supported by the box 84 and is rigidly coupled to the guiding stems 86.
  • the machine also comprises, at the lower bending station 62, a retractable abutment 12, which is arranged in an intermediate position between the bending assembly 6 and the extraction assembly 8.
  • a retractable abutment 12 In front of the extraction assembly 8, at the lower bending station 62, there can be an additional driving assembly 13 constituted by pairs of contrarotating wheels.
  • the machine can be provided with a carriage 14 with compartments for selectively collecting the finished products or another similar collection means.
  • the operating method and the machine according to the present invention are used to process only the end portion of profiles in the form of bars 2, which otherwise would not be fully usable because it cannot be moved completely.
  • the method and the machine essentially entail processing the end portion of the bars 2 by performing, by means of the driving devices 40, the partial advancement of the end portion of the bars 2 as much as possible, i.e., until the grip devices are engaged or close to this condition, and stopping the end portion of the bars 2 in the preset position, which is determined automatically.
  • the end portion of the bars 2 is extracted by means of the longitudinal translational motion of the clamp 9 of the extraction assembly 8, which grips the bars 2 at a portion that protrudes forward from the bending assembly 6.
  • the clamp 9 can move, as specified in greater detail hereinafter, with a stroke of controlled extent, such as to complete the dimensions of the shaped articles to be produced.
  • the end portion of the bars 2 performs, under the actuation of the driving devices 4, a first advancement stroke until the driving devices are able to grip the bar or shortly before this.
  • the subsequent movement of the bars 2 by the clamp 9, which performs a stroke of controlled extent, allows to complete exactly the intended dimensions of the shaped articles, using fully or partially the end portion, which would otherwise remain unusable by an extent equal to the distance between the second driving assembly 42 and the bending head 7.
  • the vertically movable wheel of the first driving assembly 41 is also adapted to check for the presence of the bars 2, so as to detect the end portion of the bars and activate the above described operating cycle.
  • the clamp 9 is adapted to grip the bars 2 between the jaws 91 and 92 at a portion that protrudes forward from the bending assembly 6 by the actuation of the movable jaw 92 of the clamp on the part of the actuator 93 ( Figure 3 ).
  • the wheels of the driving assembly 42 are then opened so as to release the end portion of the bars 2, and the longitudinal translational motion of the end portion of the bars 2 is produced by the actuation of the clamp 9 of the extraction assembly 8, whose advancement stroke has a controlled extent, in order to complete the intended dimensions, as already explained.
  • the translational motion of the clamp 9 is performed by the actuator 10 by sliding on the guiding stems 82 rigidly coupled to the box 84 that supports the frame 90 of the clamp 9.
  • the bars 2 are cropped to size by means of the cropping assembly 5 and the optional completion of the article with subsequent processes is actuated.
  • the bending head 7 of the bending assembly 6 is moved from the upper bending station 61 to the lower bending station 62.
  • This movement can be associated with the movement of the clamp 9 that retains the bars 2 at the lower bending station 62.
  • the movement of the clamp 9 is actuated by the actuator 11 by the sliding of the structure 80 on the columns 83, which are rigidly coupled to the fixed framework of the machine, with an axis that is perpendicular to the advancement direction of the bars 2 and parallel to the working plane.
  • the clamp 9 can move, under the actuation of the actuator 87, to a retracted position with respect to the working plane of the machine, so as to not be a hindrance during machining.
  • the clamp 9 can also feed the semifinished articles to the lower driving assembly 13, which moves them in order to perform the intended bending operations in the rear portion of the bars.
  • the finished products are unloaded into the optional underlying trolley 14, which is provided with compartments for selectively collecting the finished products.
  • the clamp 9 removes it and places it among the waste.
  • the method and the machine according to the invention therefore achieve the aim of making the end portion of metal profiles in bar form still workable in machines for bending these profiles, allowing full utilization of the end portion of the bars in order to obtain an additional shaped article or a larger article.
  • the extraction device 8 is activated only if necessary to move the end portion of the bars 2 and is instead inactive during the processing of the bar portions that precede the end portion.
  • Figure 7 illustrates a further embodiment of the machine, in which the extraction assembly 8 is arranged at the output of the cropping assembly 5, to the rear of the bending assembly 6, between the cropping assembly and the bending station, along the line 3 for feeding the bars 2.
  • the clamp 9 is adapted to grip the bars 2 during bending, so as to act as abutment for the bending in the upper bending station 61.
  • the materials used may be any according to the requirements.

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

Claims (13)

  1. Verfahren zum Biegen von Metallprofilen in Stabform in Maschinen des Typs, der eine Linie (3) zum Zuführen der Profile in Form von zu biegenden Stäben (2) umfasst, längs derer Vorrichtungen (4) zum Antreiben der Stäbe (2), eine Scheranordnung (5) und wenigstens eine Biegeanordnung (6) vorhanden sind, wobei das Verfahren umfasst: Verarbeiten des Endabschnitts der Profile in Form von Stäben (2) durch Ausführen des Vorschubs des Endabschnitts der Stäbe (2) kraft der Antriebsvorrichtungen (4); Anhalten der Endabschnitte der Stäbe (2) an einer im Voraus festgelegten Position nahe dem Punkt, in dem die Antriebsvorrichtungen (4) die Stäbe (2) in Arbeit nicht mehr ergreifen können; Ergreifen mittels einer Extraktionsanordnung (8), die mit einer Greifvorrichtung (9) des Klemmtyps versehen ist, die so beschaffen ist, dass sie hin und her bewegt werden kann, des Endabschnitts der Stäbe (2) in einem Abschnitt, der an der Vorderseite von der Biegeanordnung (6) vorsteht; Ausführen der longitudinalen translatorischen Bewegung des Endabschnitts der Stäbe (2) um einen Vorschubhub von kontrollierter Größe bei einer Betätigung der Extraktionsanordnung (8); und anschließend Scheren, um den Endabschnitt der Stäbe (2), der durch die Extraktionsanordnung (8) bewegt wird, abzuschneiden.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es umfasst: Ausführen mittels der Antriebsmittel (4) eines ersten Hubs für den Vorschub des Endabschnitts der Stäbe (2), dessen Größe in Bezug auf die Länge des Endabschnitts der Stäbe (2) veränderlich und besonders gleich dem Vorschub ist, der infolge der von dem Abstand zwischen den Antriebsmittel (4) und der Biegeanordnung (6) und/oder der Schereanordnung (5) bestimmten Beschränkungen durch die Antriebsmittel (4) ausgeführt werden kann; Anhalten des Endabschnitts der Stäbe (2) an der im Voraus festgelegten Position, die von dem Vorschub bestimmt ist, der infolge der von dem Abstand zwischen den Antriebsmittel (4) und der Biegeanordnung (6) und/oder der Schereanordnung (5) bestimmten Beschränkungen durch die Antriebsmittel (4) ausgeführt werden kann; Fertigstellen der Abmessung der geformten Gegenstände kraft der anschließenden longitudinalen translatorischen Bewegung des Endabschnitts der Stäbe (2) bei einer Betätigung der Extraktionsanordnung (8), die den Vorschubhub mit kontrollierter Länge ausführt.
  3. Maschine zum Biegen von Metallprofilen in Stabform des Typs, der eine Linie (3) zum Zuführen der Profile in Form von zu biegenden Stäben (2) umfasst, längs derer Antriebsvorrichtungen (4) für die Stäbe (2), eine Scheranordnung (5) und wenigstens eine Biegeanordnung (6) angeordnet sind, die eine Extraktionsanordnung (8) umfasst, die mit einer Greifvorrichtung (9) des Klemmtyps versehen ist, die so beschaffen ist, dass sie während eines Arbeitsschrittes den Endabschnitt der Stäbe (2) ergreift, ihn durch die Antriebsvorrichtungen (4) zu einer im Voraus festgelegten Position befördert, von der Biegeanordnung (6) nach vorn vorsteht und unter der Betätigung eines Betätigungsmittels (10) längs einer Achse, die in Bezug auf die Vorschubrichtung der Stäbe (2) longitudinal verläuft, hin und her beweglich ist, um die translatorische Bewegung der Endabschnitte der Stäbe (2) für einen Vorschubhub mit kontrollierter Größe auszuführen,
    wobei die Greifvorrichtung (9) des Klemmtyps längs einer Achse, die zu der Vorschubrichtung der Stäbe (2) senkrecht ist, durch die Betätigung eines zweiten Betätigungsmittels (11) zwischen einer oberen Position und einer unteren Position beweglich ist, die einer ersten Biegestation (61), die längs der Zuführlinie (3) angeordnet ist, bzw. einer darunterliegenden zweiten Biegestation (62), bei der wenigstens ein Biegekopf (7) der Biegeanordnung (6) so ausgelegt ist, dass er arbeiten kann, entsprechen.
  4. Maschine nach Anspruch 3, dadurch gekennzeichnet, dass die Greifvorrichtung (9) des Klemmtyps so beschaffen ist, dass sie die Stäbe (2) einer unteren Antriebsanordnung (13), die bei der unteren Biegestation (62) angeordnet ist, zuführt.
  5. Maschine nach Anspruch 3, dadurch gekennzeichnet, dass sie bei der unteren Biegestation (62) einen zurückziehbaren Anschlag (12) umfasst, der an einer Zwischenposition zwischen der Biegeanordnung (6) und der Extraktionsanordnung (8) angeordnet und so beschaffen ist, dass er während des Biegens mit dem hinteren Ende der Stäbe (2) zusammenwirkt.
  6. Maschine nach Anspruch 3, dadurch gekennzeichnet, dass sich die Greifvorrichtung (9) des Klemmtyps längs einer Achse, die quer zu der Stabvorschubrichtung (2) liegt, bei einer Betätigung eines zusätzlichen Betätigungsmittels (87) zwischen einer Position, die in Bezug auf die Arbeitsebene der Maschine zurückgezogen ist, und einer Position, die in Bezug auf die Arbeitsebene nach außen vorsteht, hin und her bewegt werden kann.
  7. Maschine nach Anspruch 6, dadurch gekennzeichnet, dass die Greifvorrichtung (9) des Klemmtyps von einem Rahmen (90) unterstützt ist, der mittels Führungsschäfte (86) längs der Achse, die quer zu der Vorschubrichtung der Stäbe (2) liegt, auf einem Kasten (84) gleiten kann, mit dem das zusätzliche Betätigungsmittel (87) starr gekoppelt ist, wobei der Kasten (84) mittels Führungsstäben (82), die zu der Vorschubrichtung der Stäbe (2) longitudinal verlaufen, auf einer Struktur (80) gleiten kann, mit der die Betätigungsmittel (10), die die translatorische Bewegung des Endabschnitts der Stäbe (2) für einen Vorschubhub mit kontrollierter Größe ausführen können, starr gekoppelt sind.
  8. Maschine nach Anspruch 7, dadurch gekennzeichnet, dass die Struktur (80) an Säulen (83), die mit dem festen Rahmen der Maschine starr gekoppelt sind, auf der Arbeitsebene und mit einer Achse, die zu der Vorschubrichtung der Stäbe (2) senkrecht ist, gleiten kann und so beschaffen ist, dass sie durch ein Betätigungsmittel (11) zwischen einer oberen Position und einer unteren Position hin und her bewegt werden kann, die einer ersten Biegestation (61), die längs der Zuführlinie (3) angeordnet ist, bzw. einer darunterliegenden zweiten Biegestation (62), an der wenigstens ein Biegekopf (7) der Biegeanordnung (6) so ausgelegt ist, dass er arbeiten kann, entsprechen.
  9. Maschine nach Anspruch 3, dadurch gekennzeichnet, dass die Antriebsvorrichtungen (4) eine erste Antriebsanordnung (41) und eine zweite Antriebsanordnung (42), die längs der Zuführlinie (3) beabstandet sind, und einen Motor (40), der an einer Mittelposition zwischen der ersten und der zweiten Antriebsanordnung (41, 42) angeordnet und mit diesen durch entsprechende Kraftübertragungsorgane (44, 45) mit gleicher Länge verbunden ist, besitzen.
  10. Maschine nach Anspruch 9, dadurch gekennzeichnet, dass die erste Antriebsanordnung (41) und die zweite Antriebsanordnung (42) durch Paare von entgegengesetzt rotierenden Rädern (43), die durch ein Betätigungsmittel mit gleichen Eigenschaften betätigt werden, gebildet sind.
  11. Maschine nach Anspruch 3, dadurch gekennzeichnet, dass sie in einem unteren Bereich mit einem Schlitten (14) versehen ist, der mit Fächern für die wahlweise Sammlung der fertig gestellten Produkte versehen ist.
  12. Maschine nach Anspruch 3, dadurch gekennzeichnet, dass die Extraktionsanordnung (8) vor der Biegeanordnung (6) längs der Linie (13) zum Zuführen der Stäbe (2) angeordnet ist.
  13. Maschine nach Anspruch 3, dadurch gekennzeichnet, dass die Extraktionsanordnung (8) am Ausgang der Scheranordnung (5) hinter der Biegeanordnung (6) längs der Linie (13) zum Zuführen der Stäbe (2) angeordnet ist, wobei die Greifvorrichtung (9) des Klemmtyps die Stäbe (2) während des Biegens in der ersten oberen Biegestation (61) greifen kann, um so als ein Anschlag für das Biegen zu wirken.
EP02007704A 2001-04-06 2002-04-05 Verfahren zum Biegen von Profilstäben und Vorrichtung zur Durchführung dieses Verfahrens Expired - Lifetime EP1247594B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO010209 2001-04-06
IT2001BO000209A ITBO20010209A1 (it) 2001-04-06 2001-04-06 Metodo per la piegatura di profilati metallici in barre e macchina per attuare tale metodo

Publications (3)

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EP1247594A2 EP1247594A2 (de) 2002-10-09
EP1247594A3 EP1247594A3 (de) 2003-07-16
EP1247594B1 true EP1247594B1 (de) 2008-12-17

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EP (1) EP1247594B1 (de)
AT (1) ATE417680T1 (de)
DE (1) DE60230354D1 (de)
DK (1) DK1247594T3 (de)
ES (1) ES2319964T3 (de)
IT (1) ITBO20010209A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUD20070223A1 (it) * 2007-11-26 2009-05-27 Piegatrici Macch Elettr Macchina piegatrice per elementi metallici oblunghi, e relativo procedimento

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1252962B (it) * 1991-10-15 1995-07-07 M E P Macchine Eletroniche Pie Procedimento per l'esecuzione delle pieghe di coda nei ferri per l'edilizia in macchine piegatrici/ sagomatrici e macchine piegatrici/ sagomatrici per ferri per l'edilizia adottanti tale procedimento
IT1252984B (it) * 1991-10-21 1995-07-10 Piegatrici Macch Elettr Macchina piegatrice sagomatrice a livelli operativi multipli
AT401360B (de) * 1993-05-07 1996-08-26 Progress Ag Biegeanlage für stäbe

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ATE417680T1 (de) 2009-01-15
ITBO20010209A0 (it) 2001-04-06
DK1247594T3 (da) 2009-04-14
ES2319964T3 (es) 2009-05-18
DE60230354D1 (de) 2009-01-29
EP1247594A3 (de) 2003-07-16
ITBO20010209A1 (it) 2002-10-06
EP1247594A2 (de) 2002-10-09

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