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
  • B21F27/08—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

• the invention relates to a method for producing wire mesh mats from longitudinal and transverse wires which cross at right angles and are welded at the intersection points, in which the longitudinal wires are advanced in cycles and the transverse wires are moved in the direction transverse to the movement of the longitudinal wires in a welding line and with them Longitudinal wires are welded and a device for performing the method.
• a welding method and a resistance welding machine for producing reinforcing steel mesh mats are known, in which the cross wire is tensioned during feeding to the welding line.
• the disadvantage here is that the clamping force is not adjustable, but depends on the structurally predetermined increase in distance between the clamping jaws during the feed movement and on the spring constant of any relief springs.
• a welding machine for producing wire mesh mats is known from AT 395 229, which remedies this defect.
• this welding machine does not have any devices for treating the longitudinal and / or transverse wires which, owing to their production, pretreatment and / or handling, can be subject to a longitudinal twist or a residual torsion when they are fed into the welding line.
• the object of the invention is to provide a method and a device which make it possible, using the advantage of cross wire tensioning, to produce flat wire mesh mats from longitudinal and transverse wires in a structurally simple and reliable manner, the residual twist or residual torsion of which is compensated.
• the method according to the invention is characterized in that at least one of the transverse wires is tensioned after being fed into the welding line with a predetermined adjustable size and that before welding to the longitudinal wires at least one end of this transverse wire is at a predetermined adjustable angle about its longitudinal axis is twisted, whereupon the cross wire is welded to the longitudinal wires.
• the two ends of at least one cross wire can be equal large, oppositely directed angles are rotated.
• the ends of successive transverse wires can also be rotated through angles of equal size, preferably in the same direction, within a wire mesh mat.
• the ends of successive cross wires can be twisted by angles of different sizes, preferably in the same direction, within a wire mesh mat, the sequence of the amounts of the angles of rotation being selectable and at least one cross wire remaining untwisted.
• a device intended for carrying out the method with clamping jaws for gripping the cross wire ends and tensioning devices for tensioning the cross wire in the electrode welding line of a grid welding machine has the features that a twisting and tensioning device is arranged on both sides of the longitudinal wire feed path of the grid welding machine is that in each twisting and tensioning device for tensioning a cross wire end an upper tensioning body and a lower tensioning body are arranged vertically displaceably and drivably in a guide body, each tensioning body having an essentially horizontally displaceable tensioning slide, that for twisting a Querdrahtendes about its longitudinal axis of the guide body is rotatably mounted in a fixed bearing body with a journal and that each twisting and tensioning device can be controlled separately.
• a working cylinder which acts on the upper tensioning body with its piston rod and is fastened to the guide body, is provided.
• the guide body has a laterally projecting twist pin, which runs parallel to the bearing pin, the piston rod engaging one working cylinder each on opposite sides of the twist pin.
• the inventive tensioning of the transverse wires and the twisting of their ends before welding to the longitudinal wires compensate for any longitudinal twist and / or a residual torsion in the transverse wires which result from the manufacture, pretreatment and / or handling of the transverse wires during the feeding in the welding line originate.
• the transverse wires act on the longitudinal wires via the welding nodes in such a way that one of the manufacture, pretreatment and / or handling during the feeding into the welding line originating longitudinal twist or residual torsion in the longitudinal wires is compensated and compensated.
• FIG. 1 is a side view of a device according to the invention
• FIG. 2 shows a top view of the device according to FIG. 1 and FIG. 3 shows a partial section of the upper and lower clamping bodies.
• the device shown in FIGS. 1 to 3 is used to produce wire mesh mats, which consist of a family of parallel longitudinal wires L and transverse wires Q crossing them perpendicularly. At the crossing points, the cross wires Q are welded to the longitudinal wires L using a multi-spot welding machine.
• a multi-spot welding machine For the sake of a better overview, only a lower welding bar 1 and an electrode bank 2 with a row of lower electrodes 3 arranged on the welding bar 1 are shown schematically in FIG. 1 for this multi-spot welding machine.
• twisting and tensioning devices 4 and 5 are arranged on both sides of the feed path of the longitudinal wires L.
• Each twisting and tensioning device 4, 5 has a bearing body 6 which is fastened to a vertical mounting bracket 7 firmly connected to the lower welding beam 1, the bearing body 6 being guided along a vertical guide groove 8 of the mounting bracket 7 and via elongated adjustment slots 9 is height-adjustable according to the diameters of the longitudinal and transverse wires to be welded.
• Each rotating and tensioning device 4, 5 has a rotating plate 10 or 10 ', which rotates in the bearing body 6 via a laterally projecting bearing pin 11 and bearings 12. is stored in bar.
• the rotating plates 10, 10 'each have a pivot pin 13 running parallel to the bearing pin 11.
• Two opposing working cylinders 15, 15' are fastened to the bearing body 6 by means of a fastening plate 14 each and act with their piston rods 16 on opposite ones Sides of the pivot 13.
• a guide body 17 is fastened, which has a vertically running guide groove 18.
• an upper tensioning body 19 is arranged so as to be vertically displaceable along the guide groove 18, while a lower tensioning body 20 is fixedly connected to the guide body 17.
• a tensioning cylinder 21 fastened to the guide body 17 acts with its piston rod 22 on the upper tensioning body 19.
• an upper tensioning slide 23 is displaceably mounted on bearing rollers 24 at an angle of 15 ° to the horizontal plane and with the aid of a return spring 25 into its initial position retractable.
• the upper clamping slide has a clamping jaw 26 with an inserted clamping piece 27, which has a roughened surface, for example provided with a knurling or toothing, in order to be able to grip and clamp the cross wire without slippage.
• the lower clamping body 20 has a lower clamping slide 28 constructed analogously to the upper clamping slide 23, which is slidably mounted in the lower clamping body 20 at a negative angle of 15 ° to the horizontal plane and has the same clamping jaws 26 and clamping pieces 27 as the upper clamping slide 23 has.
• the clamping jaws 26 of the upper and lower clamping slides 23 and 28 are electrically insulated from the upper and lower clamping slides 23 and 28 by an insulating piece 29.
• the torsion clamping devices 4, 5 can be displaced relative to one another in the horizontal direction.
• Each twisting and tensioning device 4, 5 is provided with a separately controllable control device, not shown.
• the device according to the invention operates in the following way: The cross wire Q is deposited in a predetermined welding position of the multi-spot welding machine into its predetermined welding position on the longitudinal wires L by a feeder device, not shown. Then the clamping cylinders 21 of the right and left turning and clamping devices 4, 5 are activated at the same time, so that their piston rods 22 move downwards and thereby the upper clamping bodies 19 in the downward direction of the double arrow Pl move down along the guide groove 18 of the guide body 17.
• the two tensioning slides 23, 28 of each twisting and tensioning device 4, 5 move outward along their guideways inclined to the horizontal plane within the corresponding tensioning bodies 19, 20, wherein the movements of the upper clamping slide 23 have an outwardly directed horizontal component P2 and the movements of the lower clamping slide 28 have an opposite, likewise outwardly directed horizontal component P3.
• the ends of the cross wire are moved outwards and the cross wire is thus tensioned.
• the tensioning force acting on the cross wire depends on the mechanical properties of the cross wire and is set via the working pressure in the tensioning cylinders 21, whereby this may only be chosen so large that the cross wire is stretched sufficiently taut without plastic deformation.
• the working cylinder 15 of the left twisting and tensioning device 4 and the working cylinder 15 'of the right twisting and tensioning device 5 are activated accordingly, so that the twisting plate 10 of the left twisting and tensioning device 4 and the twisting plate 10' of the right Rotating and tensioning device 5 perform opposite rotary movements, whereby the left transverse wire end is rotated about its longitudinal axis in accordance with a direction of the double arrow P5, while the opposite right transverse wire end is rotated in a rotational movement opposite to the direction of rotation P5 in accordance with the double arrow P6.
• the angle of rotation is adjustable and is, for example, in the range from 0 to 15 °.
• the upper electrodes of the welding machine are then lowered into their welding position after the transverse wire ends have been turned, subjected to welding pressure and welding current, and the longitudinal and transverse wires are welded to one another at their crossing points. After the welding process, the upper electrodes move back to their original position.
• the tensioning cylinders 21 are then actuated in such a way that their piston rods 22 move back into their starting position, as a result of which the upper tensioning members 19 likewise move upward and the lower tensioning bodies 20 are relieved.
• the return springs 25 By means of the return springs 25, the upper and lower clamping carriages 23, 28 m are pressed back to their starting position, so that the clamping jaws 26 open and the transverse wire ends are released.
• the wire mesh mat is then advanced accordingly, so that a new cross wire can be fed to the welding machine, tensioned, twisted and welded to the longitudinal wires in the following work cycle.
• the rotary movements can also take place in the other directions of rotation of the double arrows P5 or P6 by corresponding activation of the other working cylinders 15 'or 15.
• the size of the rotary movements P5, P6 at the two transverse wire ends can be either the same size or different.
• the size of the rotary movements P5, P6 at the two transverse wire ends can be either the same size or different.
• it is also possible to twist the ends of successive transverse wires either with the same or with different angles of rotation during the manufacture of the wire mesh mat.
• the directions of rotation of the successive transverse wire ends can either be the same or opposite.
• it is possible within the scope of the invention, during the production of a wire mesh mat to use transverse wires with twisted and non-twisted ends in a freely selectable number and sequence. to be sufficient, the sequence of the amounts of the rotation angles being arbitrary.
• the exemplary embodiment shown can be modified in various ways within the scope of the general inventive concept, in particular with regard to the design of the drive elements, in order to achieve the clamping and rotary movements.
• the clamping and / or rotary movements can be carried out with hydraulic or electromotive drive means or via adjusting spindles.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wire Processing (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Applications Claiming Priority (4)

Publications (2)

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• 1996
  • 1996-06-13 AT AT0104396A patent/AT407501B/de not_active IP Right Cessation
• 1997
  • 1997-06-11 WO PCT/AT1997/000123 patent/WO1997047409A1/fr active IP Right Grant
  • 1997-06-11 US US08/983,389 patent/US6045031A/en not_active Expired - Fee Related
  • 1997-06-11 EP EP97925767A patent/EP0843606B1/fr not_active Expired - Lifetime
  • 1997-06-11 DE DE59703431T patent/DE59703431D1/de not_active Expired - Fee Related
  • 1997-06-11 AT AT97925767T patent/ATE200748T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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