EP0780174B1 - Method to produce welded or electrically welded reinforcement and relative device - Google Patents

Method to produce welded or electrically welded reinforcement and relative device Download PDF

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Publication number
EP0780174B1
EP0780174B1 EP96120046A EP96120046A EP0780174B1 EP 0780174 B1 EP0780174 B1 EP 0780174B1 EP 96120046 A EP96120046 A EP 96120046A EP 96120046 A EP96120046 A EP 96120046A EP 0780174 B1 EP0780174 B1 EP 0780174B1
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EP
European Patent Office
Prior art keywords
wire rod
stretching
reinforcement
elongation
rolls
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
Application number
EP96120046A
Other languages
German (de)
English (en)
French (fr)
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EP0780174A1 (en
Inventor
Giancarlo Saro
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.)
Ingegneria Industriale Srl
Original Assignee
Ingegneria Industriale Srl
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 Ingegneria Industriale Srl filed Critical Ingegneria Industriale Srl
Publication of EP0780174A1 publication Critical patent/EP0780174A1/en
Application granted granted Critical
Publication of EP0780174B1 publication Critical patent/EP0780174B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F27/00—Making wire network, i.e. wire nets
    • B21F27/12—Making special types or portions of network by methods or means specially adapted therefor
    • B21F27/20—Making special types or portions of network by methods or means specially adapted therefor of plaster-carrying network
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F23/00—Feeding wire in wire-working machines or apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F27/00—Making wire network, i.e. wire nets
    • B21F27/08—Making wire network, i.e. wire nets with additional connecting elements or material at crossings
    • B21F27/10—Making wire network, i.e. wire nets with additional connecting elements or material at crossings with soldered or welded crossings

Definitions

  • This invention concerns a method to produce welded or electrically welded reinforcement for use in the building trade and the relative production device, as set forth in the preambles of the respective main claims.
  • the invention is applied to the production of welded or electrically welded reinforcement, beams, trestles and mesh consisting of a plurality of longitudinal and transverse wire rods crossed over each other and welded together by welding or electric welding.
  • the reinforcement thus produced is widely and consistently applied to the field of building constructions as a reinforcement for concrete castings.
  • Electrically welded reinforcement (mesh, trestles, etc.) is normally produced from steel which does not present any problems in welding and according to one of the following methods:
  • This ratio is of fundamental importance to deal with extreme situations such as impacts, fires, the realisation of plastic hinges, deformations caused by temperature, shrinkage, viscosity, etc.
  • This parameter together with the elongation under maximum force (Agt), allows a local plastic elongation of the stretched fibre and a distribution of the plasticization along the axis of the membrane in the reinforced concrete .
  • AT-A-214241 on which is based the preamble of the independent claims of the present application, discloses a method to produce welded or electrically welded reinforcement starting with steel wire rods, in which the wire rods are fed to the welding machine in the form of roll or reel directly as they arrive form a hot rolling line.
  • the winding of the wire rod from each roll is carried on tangentially from a plurality of reels rotating on their axis.
  • the rotation of the reels during the unwinding of the wire rod doesn't allow to weld the trailing end of a reel in use with the leading end of another reel acting as a reserve, thus constraining to stop the forming machine and the welding cycle each time when a reel is exhausted.
  • US-A-4.332.630 discloses a method of cooling wire rod slowly and then coiling it onto a roll, but it doesn't teach how to feed continously the wire rod to a welding machine for the production of reinforcements or the like.
  • the purpose of the invention is to provide a welded or electrically welded reinforcement which has the required characteristics of ductility, obtained directly in the formation line of the reinforcement itself without any need for an intermediate cold working step.
  • the wire rod is no longer unwound from a reel onto which it was wound during the cold working step, but from a roll coming directly from the hot rolling line.
  • the unwinding speed upstream of the production line is considerably lower than in the cold rolling process, and thus this step is simplified and also the removal of the scale produced is facilitated
  • the deformations achieved upstream of the welding process can be obtained in various ways:
  • This invention therefore provides a method and the relative device for the production of welded or electrically welded reinforcement starting directly from wire rod consisting of hot rolled steel without the need of any preliminary or intermediate processing treatment, thus obviating the use of further devices and considerably reducing the processing times and costs and also reducing the labour force required and the necessary equipment.
  • the machine to produce the electrically welded mesh is fed with wound rolls of wire rod arriving directly from the hot rolling line.
  • wound rolls arriving from a storage area or also directly from a pre-arrangement step downstream of the rolling line in the event of possible immediate use are positioned on an unwinding unit which feeds the mesh-forming machine with a number of wire rods according to the width of the mesh to be produced.
  • the mesh-forming machine is fed with lengths of wire rod pre-sheared to size and pre-arranged at the outlet of the hot rolling line.
  • means suitable to impart a desired deformation to the wire rod which feeds the welding unit are included upstream of the unit performing the welding of the wire rod on the mesh-forming machine and between that unit and the unit unwinding the wound rolls.
  • the characteristics of ductility are measured with the ratio between the breaking tension and the stretching tension (Rm/Re: known as work-hardening) and with the Agt (total elongation under maximum load).
  • Optimum elongation obtained with the invention vary from 1.5 to 5%, with working values from 1 to 7%.
  • the process according to the invention makes it possible to control the elongation and thus prevent, or at least reduce, unwanted deformations introduced by: unwinding, movement and winding, which in the traditional process can be created.
  • the elongation can be controlled in various ways, including:
  • the optimum composition of the steel used can be included within the following ranges: carbon content 0.16 to 0.20%, manganese content 0.60 to 0.80%, silicon content 0.20 to 0.30%, sulphur content max. 0.04%, phosphorus content max. 0.04%.
  • the cycle of the starting material in the cooling conveyor as it leaves the hot rolling mill is as follows: it passes from a temperature of 800/950°C at the loop-forming head to a temperature of about 500°C by the end of the cooling conveyor in a period of time which varies from 2 to 10 minutes according to the diameter of the wire rod.
  • the temperature of the material is of about 200°C.
  • the wire rod according to the invention is hot ribbed directly in the hot rolling mill with diameters which vary from 5 to 16 mm.
  • the unwinding upstream of the welding machine can be performed upwards by using bundles or stationary reels: this makes it possible to weld the leading and trailing ends of the material while the machine is working, and thus ensures continuity of the working process.
  • the means which obtain the elongation of the wire rod can be straightener means, either on a single plane or on two or more off-set planes.
  • the diameter and the distance between the axes of the rolls used should be of a dimension proportionate to the diameter of the wire rod, in order to avoid unwanted vibrations and rotary movements.
  • the following parameters are valid: diameter of the rolls from 60 to 100 mm, distance between the axes of the rolls 0.85 - 1.15 times the diameter of the rolls, where by distance between the axes we mean the distance between two contiguous rolls measured along the axis of the wire rod.
  • the invention includes the use of a wire rod straightening device with 5 or 7 rolls, on one or two planes, with the diameter of the rolls 60 mm and the distance between the axes 65 mm (optimum measurements for wire rod from 6 to 8 mm).
  • one or more rolls of the straightening device can be motorised in order to draw the wire rod.
  • the reference number 10 in the attached figures denotes generally a device to produce electrically welded mesh starting with hot rolled wire rod according to the invention.
  • the device 10 comprises a feeder-unwinding unit 21 which bears a plurality of wound rolls 12 of wire rod, either smooth or already ribbed, produced by a hot rolling line.
  • the feeder-unwinding unit 21 comprises two aligned rows of wound rolls 12 engaged in the feeding step and two mating rows of wound rolls 12a acting as a reserve.
  • wire rod arriving from the hot rolling process and wound in rolls 12 devoid of a central core and of ends enables those rolls 12 to be unwound upwards (Fig.2) with the ability to weld the trailing end of a wound roll 12 being unwound to the leading end of the reserve wound roll 12a; in this way it is possible to obtain a continuous feed of the mesh-forming machine for a substantially unlimited time.
  • the individual wire rod being unwound from the respective wound rolls 12, before the rods enter a welding unit or units 16, are subjected in-line to a deformation treatment able to cause an elongation of the material, of a small amount of between 1% and 5%, and a resulting work-hardening of the material together with an improvement of the mechanical and strength properties of the wire rod, but always maintaining a high level of ductibility.
  • this deformation treatment causes, as an additional and auxiliary effect, the mechanical descaling of the surface of the wire rod, thus obviating the need to carry out this operation with specific preliminary operations, this descaling being necessary for the production of electrically welded mesh.
  • This deformation treatment is carried out by an appropriate means 14 located in the line between the feeder-unwinding unit 21 and the welding unit 16.
  • This device 14 may be of any type of the state of the art which can be adapted to inclusion in the line on an electrically welded mesh forming machine.
  • Fig.3 shows as an example a deformation device 14 which is equipped with two consecutive stretching units 23a, 23b which are positioned on planes perpendicular to each other and through which the wire rod 11 is drawn by multiple drawing units 24 consisting of powered rolls.
  • Each stretching unit 23a, 23b comprises a plurality of rolls, the number of which may vary from a minimum of three to a maximum of eleven or more, but advantageously between 5 and 7, which impart to the wire rod 11 passing through a stretching and consequent elongation suitable to increase the ductility and mechanical properties of the wire rod 11.
  • these stretching units 23a, 23b may be included and may act on alternately off-set planes, depending on the size of the machine, on the production requirements, on the intrinsic properties of the basic material and on other parameters known a priori.
  • the diameter of the rolls 25 is between 60 and 100 mm, while the distance between the axes "i" measured along the axis of the wire rod 11 between one roll 25 and the adjacent one is preferably equal to about 0.8 ⁇ 1.15 of the said diameter.
  • the diameter of the rolls 25 is about 60 mm and the distance between the axis "i" is about 65 mm.
  • one or more rolls 25 are powered so as to prevent localised crushing of the wire rod 11 in correspondence with the drawing means 24.
  • Fig.4 shows a second possible deformation device 14 in which two rolls 20a, 20b on which the wire rod 11 is wound rotate at a different number of rotations, thus causing the drawing and controlled elongation of the wire rod 11.
  • a means which comprises a rotary element arranged with its axis substantially coinciding with that of the wire rod 11 being fed, this rotary element being equipped with hyperbolic bushes or rolls.
  • This means which is of a type known in the state of the art and is normally used to straighten the wire rod, can also be used in cooperation with one or more of the stretching units 23a, 23b shown in Fig.3 and has also the task of drawing the wire rod 11, in the case of hyperbolic rolls.
  • a device 14 which combines one drawing and/or stretching unit of the type shown in Fig.3 and another unit of the type shown in Fig.4.
  • the method provides for a value of elongation normally between 1% and 7%, but advantageously between 1.5% and 5%, and this value can be pre-set and kept unchanged or can be controlled and adjusted moment by moment by means of appropriate adjustment means governed by sensors.
  • These sensors may consist, for instance, of speed monitoring means positioned at the inlet (22a) and at the outlet (22b) of the device 14 and monitoring the value of the elongation on the basis of the difference in speed.
  • sensors may be used which monitor the elongation of the wire rod 11 directly.
  • the elongation may be monitored by measuring the absorption of the drawing means.
  • the drawn and work-hardened longitudinal wire rods 11a pass through a pre-unwinding means 13 and are fed to a step-by-step feeding means 15, which positions them in the welding unit 16.
  • the pre-unwinding means 13 has the function of a buffer stock between the feeder-unwinding unit 21 feeding the wire rod 11 continuously and the step-by-step feeding means 15.
  • one or more wire rods from the relative wound feeder rolls 12 are sent through an analogous device 14 to a longitudinal pre-unwinding means 13 and are then delivered by a step-by-step feeding means 15 to the welding unit 16 so as to cooperate perpendicularly with the longitudinal wire rods 11a.
  • the longitudinal 11a and/or transverse 11b wire rods may also be fed from lengths of wire rod sheared to size and pre-arranged in a preliminary step.
  • the welding unit 16 welds the transverse wire rod or wire rods 11b to the longitudinal wire rod or wire rods 11a, and at the same time a shears 17b shears the transverse wire rods 11b to size.
  • the step-by-step feeding means 15 then carry out a step-by-step movement and arrange the wire rods 11a, 11b for the subsequent welding.
EP96120046A 1995-12-22 1996-12-13 Method to produce welded or electrically welded reinforcement and relative device Expired - Lifetime EP0780174B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD950249 1995-12-22
IT95UD000249A IT1281466B1 (it) 1995-12-22 1995-12-22 Procedimento di produzione di reti elettrosaldate e relativo dispositivo

Publications (2)

Publication Number Publication Date
EP0780174A1 EP0780174A1 (en) 1997-06-25
EP0780174B1 true EP0780174B1 (en) 2001-03-14

Family

ID=11421984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96120046A Expired - Lifetime EP0780174B1 (en) 1995-12-22 1996-12-13 Method to produce welded or electrically welded reinforcement and relative device

Country Status (5)

Country Link
EP (1) EP0780174B1 (it)
AT (1) ATE199667T1 (it)
DE (1) DE69612069T2 (it)
ES (1) ES2157393T3 (it)
IT (1) IT1281466B1 (it)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705945A1 (de) * 1997-02-17 1998-08-20 Besta Eisen Und Stahlhandelsge Anlage zum Richten, Kaltverfestigen und anschließendem Bearbeiten von Drahtmaterial
GB2322386A (en) * 1997-02-22 1998-08-26 Tornado Wire Limited Fencing nets with varying strength
AT407719B (de) * 1998-02-10 2001-05-25 Evg Entwicklung Verwert Ges Verfahren und anlage zum herstellen von gittermatten
AT408196B (de) * 1999-03-02 2001-09-25 Evg Entwicklung Verwert Ges Verfahren und anlage zum herstellen von gittermatten
CN102615219A (zh) * 2012-03-24 2012-08-01 胡建军 建筑用钢筋架新型制造机
CN103008508B (zh) * 2012-09-24 2016-04-27 青岛田瑞生态科技有限公司 一种电镀锌笼网的制造方法及其生产系统
FI125869B (fi) * 2013-01-11 2016-03-15 Hattula Tex Oy Menetelmä teräslangasta valmistetun kaivosverkon valmistamiseksi sekä kaivosverkon käyttö
GR1008523B (el) 2014-04-01 2015-07-09 Αντωνιος Παναγιωτη Αναγνωστοπουλος Μεθοδος και συστημα τροφοδοσιας διαμηκων συρματων ή μπετοβεργων σε μηχανηματα παραγωγης πλεγματος
CN104043763B (zh) * 2014-06-11 2016-03-23 建科机械（天津）股份有限公司 钢筋网焊接生产线的上步进轮机构
CN106944579A (zh) * 2017-05-24 2017-07-14 天津市银丰机械系统工程有限公司 全自动柔性焊网生产线
AT523692B1 (de) * 2020-03-17 2022-05-15 Evg Entwicklungs U Verwertungs Ges M B H Verfahren und Vorrichtung zur Herstellung von geschweißten Bewehrungsgittern mit hohen Festigkeits- und Dehnwerten
CN111633159A (zh) * 2020-06-15 2020-09-08 莱芜钢铁集团有限公司 一种自动排焊机

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT214241B (de) * 1958-05-09 1961-03-27 Evg Entwicklung Verwert Ges Verfahren und Anlage zur Herstellung von geschweißten Drahtgittern
JPS5852451B2 (ja) * 1976-07-19 1983-11-22 新日本製鐵株式会社 伸線材の線径測定方法及び装置
GB1587215A (en) * 1977-11-03 1981-04-01 British Steel Corp Manufacture of welded steel mesh
DE2825592A1 (de) * 1978-06-10 1979-12-13 Scheid Heinrich Verfahren zur herstellung von schweissbarem bewehrungsstahl und bewehrungsstahl nach diesem verfahren
DE3039605A1 (de) * 1979-10-26 1981-05-07 Centre de Recherches Métallurgiques-Centrum voor Research in de Metallurgie-Association sans but lucratif-Vereniging zonder winstoogmerk, Bruxelles Verfahren zur kontinuierlichen abkuehlung von walzdraht aus stahl mit niedrigem kohlenstoffgehalt
AT386364B (de) * 1986-07-28 1988-08-10 Evg Entwicklung Verwert Ges Einrichtung zum richten und zufuehren naturharter, warmgewalzter draehte zu einem verbraucher
DE4137122A1 (de) * 1991-11-12 1993-05-13 Indra Gmbh Verfahren zum kontinuierlichen fertigen von betonstahlmatten

Also Published As

Publication number Publication date
ITUD950249A0 (it) 1995-12-22
ES2157393T3 (es) 2001-08-16
ATE199667T1 (de) 2001-03-15
EP0780174A1 (en) 1997-06-25
DE69612069T2 (de) 2001-08-02
ITUD950249A1 (it) 1997-06-22
DE69612069D1 (de) 2001-04-19
IT1281466B1 (it) 1998-02-18

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