EP1247595B1 - Method for bending metal profiles in bar form and machine for performing the method - Google Patents

Method for bending metal profiles in bar form and machine for performing the method Download PDF

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Publication number
EP1247595B1
EP1247595B1 EP02007705A EP02007705A EP1247595B1 EP 1247595 B1 EP1247595 B1 EP 1247595B1 EP 02007705 A EP02007705 A EP 02007705A EP 02007705 A EP02007705 A EP 02007705A EP 1247595 B1 EP1247595 B1 EP 1247595B1
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EP
European Patent Office
Prior art keywords
bars
bending
assembly
end portion
clamp
Prior art date
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Expired - Lifetime
Application number
EP02007705A
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German (de)
English (en)
French (fr)
Other versions
EP1247595A2 (en
EP1247595A3 (en
Inventor
Gianfranco Terenzi
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
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Filing date
Publication date
Application filed by Schnell SpA filed Critical Schnell SpA
Publication of EP1247595A2 publication Critical patent/EP1247595A2/en
Publication of EP1247595A3 publication Critical patent/EP1247595A3/en
Application granted granted Critical
Publication of EP1247595B1 publication Critical patent/EP1247595B1/en
Anticipated expiration legal-status Critical
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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

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 as nearest state of the art 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, with a fixed stroke ( Figure 3).
  • 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 ( Figure 1).
  • 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 a final unusable portion, at least equal to the distance between the second driving assembly 42 and the bending head 7, would remain in any case.
  • 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 and stopping the end portion of the bars 2 in a preset position, which is determined automatically according to the dimensions of the shaped articles to be produced and to the fixed stroke that the clamp is capable of performing.
  • 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.
  • the clamp 9 grips the bars 2 at a portion that protrudes forward from the bending assembly 6.
  • the preset movement by the driving devices 4 is calculated by subtraction, so that the clamp 9, which can move, as specified in greater detail hereinafter, with a stroke of fixed extent, is 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 whose extent is variable according to the dimensions of the shaped articles to be produced and is equal, in particular, to the difference between the dimension to be provided and the fixed stroke of the clamp 9.
  • the advancement performed by the driving devices 4 stops in a preset position, determined by the difference between the dimensions of the shaped articles to be produced and the fixed stroke of the clamp 9.
  • the vertically movable wheel of the first driving assembly 41 is also meant 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 bars 2 exit from the first driving assembly 41 the fact that there is a remaining length of bar equal to the distance between the two driving assemblies 41 and 42 is in fact detected. This also allows to check the correctness of the length optionally set by the operator with the initial data.
  • the end portion of the bars 2 is placed in the preset position by the second driving assembly 42.
  • 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 means of 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 fixed 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 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 does not require movement measurement devices, which would complicate its construction and increase its cost, and is instead provided simply with a fixed-stroke clamp 9.
  • 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.
EP02007705A 2001-04-06 2002-04-05 Method for bending metal profiles in bar form and machine for performing the method Expired - Lifetime EP1247595B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001BO000208A ITBO20010208A1 (it) 2001-04-06 2001-04-06 Metodo per la piegatura di profilati metallici in barre e macchine per attuare tale metodo
ITBO010208 2001-04-06

Publications (3)

Publication Number Publication Date
EP1247595A2 EP1247595A2 (en) 2002-10-09
EP1247595A3 EP1247595A3 (en) 2003-07-16
EP1247595B1 true EP1247595B1 (en) 2007-05-16

Family

ID=11439253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02007705A Expired - Lifetime EP1247595B1 (en) 2001-04-06 2002-04-05 Method for bending metal profiles in bar form and machine for performing the method

Country Status (6)

Country Link
EP (1) EP1247595B1 (es)
AT (1) ATE362408T1 (es)
DE (1) DE60220117T2 (es)
DK (1) DK1247595T3 (es)
ES (1) ES2286172T3 (es)
IT (1) ITBO20010208A1 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK176637B1 (da) * 2003-12-24 2009-01-05 Stema Engineering As Fremgangsmåde ved bukning af stangmateriale samt værktöj til udövelse heraf

Family Cites Families (3)

* 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

Also Published As

Publication number Publication date
DK1247595T3 (da) 2007-06-11
ITBO20010208A1 (it) 2002-10-06
EP1247595A2 (en) 2002-10-09
ATE362408T1 (de) 2007-06-15
DE60220117D1 (de) 2007-06-28
ITBO20010208A0 (it) 2001-04-06
EP1247595A3 (en) 2003-07-16
DE60220117T2 (de) 2008-01-24
ES2286172T3 (es) 2007-12-01

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