EP2600991B1 - Verfahren und vorrichtung zur korrektur der torsionsbeanspruchung bei metallstäben - Google Patents

Verfahren und vorrichtung zur korrektur der torsionsbeanspruchung bei metallstäben Download PDF

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Publication number
EP2600991B1
EP2600991B1 EP11741559.6A EP11741559A EP2600991B1 EP 2600991 B1 EP2600991 B1 EP 2600991B1 EP 11741559 A EP11741559 A EP 11741559A EP 2600991 B1 EP2600991 B1 EP 2600991B1
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Prior art keywords
rod
rods
correction
engage
axis
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EP11741559.6A
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English (en)
French (fr)
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EP2600991A1 (de
Inventor
Simone Rupoli
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Schnell SpA
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Schnell SpA
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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
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
    • B21D3/05—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes rectangular to the path of the work
    • 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
    • B21F1/02—Straightening

Definitions

  • the present invention regards a method and an apparatus for correcting the effect of twist stresses in metal rods and the like, designed in particular for making reinforcements for reinforced concrete.
  • metal rods in coil used in particular for making reinforcements for reinforced concrete, are generally fed by respective reels to be worked in machines provided with suitable straightening apparatuses.
  • Such straightening apparatuses are usually provided with a series of operating members suitable to act on the metal rod being advanced before it reaches the successive working stations, for example the cut station and successively sometimes the folding station.
  • Such straightening apparatuses are suitable to eliminate the residual curvature caused by the winding of the rod as a coil.
  • the straightening members subject the rod to suitable flexure actions of intensity such as to overcome the elastic limit of the material, so as to substantially eliminate the residual curvature which, due to the elasticity, would tend to go back to the original conformation, and thus to make the straightening effect permanent.
  • Such apparatuses comprise one or more straightening units consisting of a plurality of couples of grooved wheels, opposite with respect to the axis of the rod and counter-rotating, to engage the same rod fed in advancement therebetween.
  • the counter-rotating straightening wheels are arranged in sequence and with parallel axis.
  • such apparatuses can provide a first straightening unit and a second straightening unit, suitable to correct prevalently corresponding components of the curvature of the metal rod on different planes, for example on a horizontal plane and on a vertical plane.
  • a problem which occurs in the considered field is that of eliminating or suitably reducing the effects of the residual twist stresses that can occur in the metal rods after the passage in the straightening apparatuses or are induced by effect of the unwinding from the reel from which they come.
  • such residual stresses can produce undesired effects in the rod folding step, for example producing stirrups in which the head and tail folds are not coplanar, or stirrups which ends are not close to each other, or substantially overlapped, but result open so that the whole piece does not lie substantially on a single plane, and thus comes to be very similar to a coil.
  • International patent application WO 01/60540 illustrates a method for reducing the undesired effects consequent to the twist stresses in metal rods which consists of making the rod pass between two rows of straightening wheels provided with a groove suitably shaped and preferably V shaped, one of which can be shifted on its own axis in a direction transverse to the feed axis of the rod, for a tract previously determined in an empirical way, so as to determine a curvilinear path of the same rod.
  • the task of the present invention is that of solving the aforementioned problems, devising a method that allows to perform in an efficient way the correction of the twist stresses in metal rods.
  • Another object of the present invention is that of providing a straightening unit provided with the aforesaid correction apparatus.
  • a further scope of the invention is that of providing a correction apparatus of simple building and functional conception, provided with securely reliable functioning and versatile use, as well as relatively economic cost.
  • the method for correcting the twist stresses in metal rods provides for feeding a first rod through at least one first correction wheel provided with a grooved portion, suitably shaped, suitable to engage also transversally said first rod and with an adjacent flat bottom portion suitable to engage a second rod fed by the side of the first rod.
  • the axial shifting of said first correction wheel is then performed, in a direction transverse to the feed axis of the rods, so as to act on said first rod without having influence on the second rod placed beside to the rod to be corrected.
  • the second correction wheel provided with a grooved portion, suitably shaped, suitable to engage said second rod and with an adjacent flat bottom portion suitable to engage said first rod.
  • Axial shifting of said first and/or second straightening wheel is then performed, in a direction transverse to the feed axis of the rods, to perform respectively the correction of the twist effect of said first and/or of said second rod, without having influence on the rod placed beside to the rod to be corrected.
  • the present invention also concerns an apparatus for correcting the twist stresses in metal rods.
  • the apparatus comprises at least one first correction wheel, rotatable according to an axis transverse to the feed axis of the rods, having a grooved portion, suitably shaped, suitable to engage also transversely a first rod, and an adjacent flat bottom portion suitable to engage a second rod fed by the side of the first rod, said first correction wheel being suitable to be actuated in axial shifting, in a direction transverse to the feed axis of the rods, to perform the correction of the twist effect of said first rod.
  • the apparatus comprises a second straightening wheel rotatable about an axis parallel to the axis of said first correction wheel, having a grooved portion, suitably shaped, suitable to engage said second rod and an adjacent flat bottom portion suitable to engage said first rod, said correction wheels being suitable to be actuated in axial shifting, independently from each other, in a direction transverse to the feed axis of the rods, to perform respectively the correction of the effect of the twist stresses of said first rod and/or of said second rod.
  • a straightening unit provided with the apparatus 10 for correcting the twist stresses in metal rods 2, object of the invention, is indicated in its entirety with 1.
  • the straightening unit 1 comprises, in a known way, a plurality of straightening wheels 3, 4, suitably grooved, arranged in sequence with axis parallel at opposite sides with respect to the feed axis of the rods 2.
  • the straightening wheels 3 arranged at one side of the rods are counter-rotating with respect to the straightening wheels arranged at the opposed side, under control of suitable motor member or drawn by the rod pulled or pushed which crosses them.
  • straightening wheels 3, 4 are arranged staggered with respect to each other according to the feed axis of the rods 2 and have each a couple of throats 3a, 4a placed beside, with V-shaped profile, so as to engage a couple of rods 2 placed beside, fed simultaneously between the same straightening wheels 3, 4.
  • the straightening wheels 3, 4 are arranged on a vertical plane, with the upper wheels 3 set carried rotatable by a frame 5 that is mobile with respect to a base structure 6 whereon the lower wheels 4 are carried rotatable, under control of suitable motor members.
  • the upper wheels 3 are staggered with respect to the lower wheels 4.
  • Practically the upper straightener wheels 3 can be suitably approached or spaced with respect to the lower straightener wheels 4 to set the strength of the straightening on the basis of the exigencies of the row material being worked.
  • the correction apparatus 10 comprises a couple of correction wheels 11, 12 arranged in between in the sequence of the straightening wheels 3, 4, arranged for example staggered with respect to each other and at opposite sides with respect to the feed axis of the rods 2.
  • the correction wheels 11, 12 have respectively their axis parallel to the axis of the straightening wheels 3, 4, transverse to the feed axis of the rods 2.
  • the correction wheels 11, 12 have respectively a grooved portion 11 a, 12a, defined by an annular throat substantially similar to the annular throats of the straightening wheels 3, 4, and an adjacent flat bottom portion 11 b, 12b.
  • the grooved portion 11 a, 12a has preferably a V profile, with the sides suitably inclined to engage the rod 2 at opposite sides, or anyway it is suitably profiled to engage the rod 2 when the wheel 11, 12 is shifted along its own axis, transversely with respect to the same rod.
  • the flat bottom portion 11 b, 12b has width suitably bigger than the diameter of the rods 2 to be treated.
  • a first correction wheel 11 has an annular portion 11 a which is suitable to engage a first rod 2 fed to the straightening unit and which results more external to the straightening unit
  • a second correction wheel 12 has an annular portion 12a which is suitable to engage a second rod 2 fed by the side of the first rod 2 and that results more internal to the straightening unit.
  • the correction wheels 11, 12 are suitable to be shifted according to their own axis, independently from each other, between an inactive position, wherein the respective grooved portion 11 a, 12a is arranged on the same longitudinal plane as the straightening wheels 2, 3 and an active position wherein such a grooved portion 11 a, 12a acts on a relative rod 2 shifting axially to its own rotation axis.
  • the correction wheels 11, 12 are carried rotatable, through suitable rolling members, on a respective hub 13, 14 which is supported axially slidable by the structure of the straightening unit 1 and is associated with suitable measure members 14, 15.
  • the measure members 14, 15 are constituted for example by respective linear potentiometers.
  • the shifting of the correction wheels 11, 12 into the active position can be realized through suitable actuator members or also by hand, through screw members and the like.
  • the metal rods 2 to be straightened are fed in couple, by the side of each other, between the straightening wheels 3, 4 of the straightening unit 1.
  • the rods 2 engage the corresponding throats 3a, 4a of the straightening wheels 3, 4 so as to subject the rods 2 to suitable flexure actions which enable to substantially cancel the residual curvature and make the straightening effect permanent.
  • the rods 2 engage also the grooved portion 11 a, 12a and the flat bottom portion 11 b, 12b of the correction wheels 11, 12 which, in the inactive position, result arranged on the same longitudinal plane as the corresponding throats 3a, 4a of the straightening wheels 3, 4 ( fig. 2 ).
  • the shifting in the active position of the correction wheel 11, 12 that engages by means of the relative grooved portion 11 a, 12a the rod 2 to be corrected is operated ( fig. 3 ). Following such a shifting, the grooved portion 11 a, 12a of the correction wheel 11, 12 acts on the rod 2 which crosses it, realizing the desired correction action.
  • the method and the apparatus in hand reach the scope of performing in an efficient way the correction of the twist stresses in metal rods fed to a straightening unit.
  • the apparatus allows to perform in an independent manner the correction of the twist stresses of one or more metal rods fed simultaneously to the straightening unit.
  • the apparatus described for illustrative purpose is susceptible of various modifications and variants according to the exigencies.
  • the shifting of the correction wheels from the inactive position to the active position is realized through a tilting movement of the same correction wheels, on a plane transverse to the feed axis of the rods.
  • the embodiment of the invention may vary depending on the requirements.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Claims (8)

  1. Verfahren zum Korrigieren der Wirkung von Torsionsbeanspruchung in Metallstangen, folgende Schritte umfassend:
    a. Führen eines Paares von nebeneinander angeordneten Metallstangen (2) zu einer Begradigungseinheit (1) entlang einer Führungsachse,
    b. Führen einer ersten Metallstange (2) des Paares von Metallstangen durch mindestens ein erstes Korrekturrad (11), das mit einem gekerbten Abschnitt (11 a) versehen ist, der eine geeignete Form aufweist und geeignet ist, auch die zweite Stange (2) quer in Eingriff zu nehmen, sowie mit einem benachbarten Abschnitt (11b) mit flachem Boden, der geeignet ist, eine zweite Stange (2) in Eingriff zu nehmen, die neben der ersten Stange (2) geführt wird,
    c. Durchführen der axialen Verlagerung des Korrekturrades (11) in eine Richtung quer zur Führungsachse der Stangen (2), um die Korrektur des Torsionseffektes der ersten Stange (1) durchzuführen.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es ferner folgende Schritte bereitstellt:
    c1. Führen der zweiten Stange (2) des Paares von Metallstangen durch mindestens ein zweites Korrekturrad (12), das mit einem gekerbten Abschnitt (12a) versehen ist, der eine geeignete Form aufweist und geeignet ist, auch die zweite Stange (2) quer in Eingriff zu nehmen, sowie mit einem benachbarten Abschnitt (12b) mit flachem Boden, der geeignet ist, die erste Stange (2) in Eingriff zu nehmen,
    d1. Durchführen der axialen Verlagerung des zweiten Korrekturrads (12) in eine Richtung quer zur Führungsachse der Stangen (2), um die Korrektur des Torsionseffektes der zweiten Stange (1) durchzuführen.
  3. Vorrichtung zum Korrigieren der Wirkung von Torsionsbeanspruchung in Metallstangen, dadurch gekennzeichnet, dass sie mindestens ein erstes Korrekturrad (11) umfasst, das entsprechend einer Achse quer zur Führungsachse der Stangen (2) drehbar ist, einen gekerbten Abschnitt (11a) aufweist, der eine geeignete Form aufweist und geeignet ist, auch die zweite Stange (2) quer in Eingriff zu nehmen, sowie mit einem benachbarten Abschnitt (11 b) mit flachem Boden, der geeignet ist, eine zweite Stange (2) in Eingriff zu nehmen, die neben der ersten Stange (2) geführt wird, wobei das erste Korrekturrad (11) dafür geeignet ist, in axialer Verlagerung betätigt zu werden, in eine Richtung quer zur Führungsachse der Stangen (2), um die Korrektur des Torsionseffektes der ersten Stange (1) durchzuführen.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass sie ein zweites Korrekturrad (12) umfasst, das entsprechend einer Achse parallel zur Achse des ersten Korrekturrades (11) drehbar ist, das mit einem gekerbten Abschnitt (12a) versehen ist, der eine geeignete Form aufweist und geeignet ist, die zweite Stange (2) quer in Eingriff zu nehmen, sowie mit einem benachbarten Abschnitt (12b) mit flachem Boden, der geeignet ist, die erste Stange (2) in Eingriff zu nehmen, wobei die Korrekturräder (11, 12) dafür geeignet sind, unabhängig voneinander in axialer Verlagerung betätigt zu werden, in eine Richtung quer zur Führungsachse der Stangen (2), um jeweils die Korrektur der ersten Stange und/oder der zweiten Stange (2) durchzuführen.
  5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass der Abschnitt mit flachem Boden (11b, 12b) eine Breite aufweist, die in geeigneter Weise größer als der Durchmesser der Stangen (2) ist.
  6. Einheit zum Begradigen von Metallstangen, der Art, die mehrere gegenläufig drehende Begradigungsräder (3, 4) umfasst, die nacheinander angeordnet sind, wobei ihre Achsen zueinander parallel und quer zur Führungsachse der zu begradigenden Stangen (2) liegen, in entgegengesetzter Richtung in Bezug auf die Führungsachse der Stangen (2), und die ein Paar von nebeneinanderliegenden Kerben (3a, 4a) mit V-Profil aufweist, um ein Paar von nebeneinander angeordneten Stangen (2) in Eingriff zu nehmen, die gleichzeitig zwischen die Begradigungsräder (3, 4) geführt werden, dadurch gekennzeichnet, dass sie eine Vorrichtung (1) zum Korrigieren der Wirkung von Torsionsbeanspruchung in den Stangen (2) umfasst, die mindestens ein erstes Korrekturrad (11) umfasst, das entsprechend einer Achse quer zur Führungsachse der Stangen (2) drehbar ist, einen gekerbten Abschnitt (11a) aufweist, der eine geeignete Form aufweist und geeignet ist, auch die zweite Stange (2) quer in Eingriff zu nehmen, sowie mit einem benachbarten Abschnitt (11 b) mit flachem Boden, der geeignet ist, eine zweite Stange (2) in Eingriff zu nehmen, die neben der ersten Stange (2) geführt wird, wobei das Korrekturrad (11) dafür geeignet ist, in axialer Verlagerung betätigt zu werden, in eine Richtung quer zur Führungsachse der Stangen (2), um die Korrektur der ersten Stange (1) durchzuführen.
  7. Einheit nach Anspruch 6, dadurch gekennzeichnet, dass die Vorrichtung (1) ein zweites Korrekturrad (12) umfasst, das entsprechend einer Achse parallel zur Achse des ersten Korrekturrades (11) drehbar ist, das mit einem gekerbten Abschnitt (12a) versehen ist, der eine geeignete Form aufweist und geeignet ist, die zweite Stange (2) in Eingriff zu nehmen, sowie mit einem benachbarten Abschnitt (12b) mit flachem Boden, der geeignet ist, die erste Stange (2) in Eingriff zu nehmen, wobei die Korrekturräder (11, 12) dafür geeignet sind, unabhängig voneinander in axialer Verlagerung betätigt zu werden, in eine Richtung quer zur Führungsachse der Stangen (2), um jeweils die Korrektur der ersten Stange und/oder der zweiten Stange (2) durchzuführen.
  8. Einheit nach Anspruch 7, dadurch gekennzeichnet, dass die Korrekturräder (11, 12) geeignet sind, entsprechend ihrer eigenen Achse unabhängig voneinander zwischen einer inaktiven Position, in der der jeweilige gekerbte Abschnitt (11a, 12a) in der gleichen Längsebene angeordnet ist wie die Begradigungsräder (3, 4), und einer aktiven Position verlagert zu werden, in der der gekerbte Abschnitt (11a, 12a) auf eine entsprechende Stange (2) einwirkt und sich dabei axial zu seiner eigenen Drehachse bewegt.
EP11741559.6A 2010-08-04 2011-08-03 Verfahren und vorrichtung zur korrektur der torsionsbeanspruchung bei metallstäben Active EP2600991B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO2010A000506A IT1401411B1 (it) 2010-08-04 2010-08-04 Metodo e apparecchiatura per la correzione delle sollecitazioni di torsione in tondini metallici.
PCT/EP2011/063351 WO2012016998A1 (en) 2010-08-04 2011-08-03 Method and apparatus for correcting twist stresses in metal rods

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EP2600991A1 EP2600991A1 (de) 2013-06-12
EP2600991B1 true EP2600991B1 (de) 2015-03-11

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IT (1) IT1401411B1 (de)
WO (1) WO2012016998A1 (de)

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ITUD20130124A1 (it) * 2013-09-30 2015-03-31 A C M Srl Automatismi Costruzioni Meccaniche Apparato di traino e raddrizzatura
CN107774748A (zh) * 2017-11-23 2018-03-09 上海瑞纽机械股份有限公司 一种适用于抗振条支点和扭曲的校正装置
CN109175153A (zh) * 2018-10-02 2019-01-11 河北骄阳丝网设备有限责任公司 金属丝应力消除调直机及调直金属丝的方法
CN109648445B (zh) * 2019-01-29 2020-08-14 中岭建设集团有限公司 一种具有矫正功能的钢筋打磨设备
IT201900002713A1 (it) * 2019-02-25 2020-08-25 Schnell Spa Gruppo di correzione della curvatura di elementi metallici di foggia allungata
CN113275484A (zh) * 2021-06-17 2021-08-20 美克钢纤维(马鞍山)有限公司 一种钢纤维多轮校直器

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FR2662379B1 (fr) 1990-05-22 1992-09-04 Carrere Noel Procede et dispositif pour le reglage automatique des dresseurs a galets.
IT1291259B1 (it) * 1997-03-13 1998-12-30 Schnell Spa Gruppo raddrizzante bifilare per materiali metallici in filo e simili.
IT1299943B1 (it) * 1998-03-30 2000-04-04 Schnell Spa Metodo e apparecchiatura per la raddrizzatura di profilati metallici e simili.
DK1259336T3 (da) * 2000-02-03 2006-07-31 Stema Engineering As Fremgangsmåde og apparat til reduktion af indlejrede eller iboende torsionsspændinger i armeringsstål og lignende materialer
ITBO20020604A1 (it) * 2002-09-25 2004-03-26 Schnell Spa Gruppo di correzione finale in apparecchiature per

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IT1401411B1 (it) 2013-07-26
WO2012016998A1 (en) 2012-02-09
ITBO20100506A1 (it) 2012-02-05

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