EP4221910A1 - Procédé et appareil d'acheminement d'une pièce allongée dans une machine de formage - Google Patents

Procédé et appareil d'acheminement d'une pièce allongée dans une machine de formage

Info

Publication number
EP4221910A1
EP4221910A1 EP21773331.0A EP21773331A EP4221910A1 EP 4221910 A1 EP4221910 A1 EP 4221910A1 EP 21773331 A EP21773331 A EP 21773331A EP 4221910 A1 EP4221910 A1 EP 4221910A1
Authority
EP
European Patent Office
Prior art keywords
feed
workpiece
unit
working position
straightening
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.)
Pending
Application number
EP21773331.0A
Other languages
German (de)
English (en)
Inventor
Andreas GÖNNINGER
Martin Bauer
Oliver Kuhnert
Tobias SINGLE
Robin Sautter
Peter Schwellbach
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.)
Wafios AG
Original Assignee
Wafios AG
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 Wafios AG filed Critical Wafios AG
Publication of EP4221910A1 publication Critical patent/EP4221910A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B21F23/00—Feeding wire in wire-working machines or apparatus
    • B21F23/005—Feeding discrete lengths of wire or rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/24—Transferring coils to or from winding apparatus or to or from operative position therein; Preventing uncoiling during transfer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/24—Transferring coils to or from winding apparatus or to or from operative position therein; Preventing uncoiling during transfer
    • B21C47/245—Devices for the replacement of full reels by empty reels or vice versa, without considerable loss of time
    • 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
    • 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
    • B21F23/002—Feeding means specially adapted for handling various diameters of wire or rod

Definitions

  • the invention relates to a method and a device for feeding an elongate workpiece to a forming machine.
  • Forming machines are machine tools that, with the help of suitable tools, can produce smaller or larger series of molded parts, some of which have complex geometries, primarily by forming, from elongated workpieces such as wire, pipe, strip or the like in an automatic manufacturing process.
  • a processing machine in the form of a forming machine can be, for example, a bending machine for producing two-dimensionally or three-dimensionally bent parts from wire material, strip material or tube material by bending, a nailing machine or a spring manufacturing machine for manufacturing compression springs, tension springs, torsion springs or other spring-type springs Act molded parts by spring winding or spring winding.
  • the forming machines also include, for example, straightening machines and rod assembly machines, which can produce straightened material, i.e.
  • the wire is conveyed under the control of an NC control program from a workpiece store to the tool area of the forming machine.
  • the stock of workpieces is provided in the form of a coil, which is normally held in a receiving device.
  • the term "coil” refers to a coil of wire wound up like a coil.
  • the stock of workpieces is held in a device assigned to the forming machine for feeding an elongated workpiece to the forming machine.
  • the wire that is fed in is formed into the desired shaped part by the downstream forming tools in the material conveying direction.
  • the finished molded part is separated from the supplied wire by means of a cutting device under the control of the NC control program.
  • This process is repeated cyclically for each molded part to be manufactured. If, in a forming process in which wire or tube is processed from a workpiece store in the form of a coil, high feeding speeds and large quantities are used, the workpiece store may be used up relatively quickly (e.g. within a few hours), so that a new stock of workpieces has to be exchanged. This change takes time, even for experienced machine operators. Such unproductive idle times worsen the productivity of the entire system.
  • a device for feeding wire into a production plant for machine elements of an electrical machine comprising: a carrying unit; a first spool mountable on the support unit to provide wire at a working position; a conveying device for conveying the provided wire into the production plant; wherein a second coil for providing wire can be mounted on the carrying unit in addition to the first coil; and the support unit is slidable to alternately bring the first spool or the second spool to the working position.
  • the conveyor can include a straightening section for straightening the wire.
  • a conveyor device is provided for each of the first and second coils. This should enable seamless production to be achieved.
  • the wire from the second, full spool can be threaded into the conveyor device for the second spool. This means that the wire that is on the new, full spool is prepared during the ongoing production process, thus enabling essentially seamless production when changing the spools.
  • the method and the device serve to feed an elongate workpiece to a forming machine, which has a feed device that can be operated at a predeterminable feeding speed for feeding in the fed workpiece and for conveying the workpiece to a tool area of the forming machine.
  • a feed device that can be operated at a predeterminable feeding speed for feeding in the fed workpiece and for conveying the workpiece to a tool area of the forming machine.
  • work is therefore carried out from a stock of workpieces in the form of a coil, i.e. a wound wire bundle. Successive workpiece sections of the workpiece are gradually removed from the workpiece supply and further processed in the forming machine.
  • a first feed unit and at least one second feed unit are provided for carrying out the method.
  • the at least two feed units are components of the device.
  • Each of the feed units comprises a receiving device for receiving a supply of workpieces in the form of a coil and a straightening unit downstream of the receiving device for straightening the workpiece before it enters the forming machine.
  • the receiving devices are designed in such a way that stocks of workpieces can be exchanged in a controlled manner.
  • a receiving device can be designed, for example, to receive and rotatably store an exchangeable reel.
  • the coiler serves as a winding and unwinding aid and can, for example, have a cylindrical, coil-shaped or cross-shaped structure and carry the wire-shaped workpiece in a wound form.
  • a receiving device can also be a different type of device that is suitable for receiving a coil, e.g. a container.
  • each of the feed units has a straightening unit downstream of the receiving device for straightening the workpiece before it enters the forming machine.
  • Straightening is a process step from the group of forming processes and serves to convert the elongated workpiece material into as straight a shape as possible before further processing, ie into a state with little or no curvature.
  • the workpiece material is conveyed through a straightening unit.
  • the straightening unit produces straightened material from the material by forming it in a straightening operation.
  • a straightening unit can have, for example, one or more roller straighteners and/or at least one rotating straightening blade.
  • the first feeding unit and the second feeding unit are arranged on a common platform which is movable between a first working position and a second working position.
  • the platform serves as a carrier for the components of the feed units in such a way that the position and/or the orientation of the feed units in space can be changed in a coordinated manner by moving the platform.
  • the first feed unit In the first working position of the platform, the first feed unit is arranged in a working position suitable for transferring workpiece sections to the forming machine, and the second feed unit is arranged in a set-up position.
  • the second feed unit is arranged in the working position suitable for transferring workpiece sections into the forming machine, and the first feed unit is arranged in a set-up position.
  • the respective other feed unit is then not in the working position and can, if required, be set up for a subsequent process while the forming machine is in operation.
  • the set-up position it is possible to change the stock of workpieces on the receiving device of that feed unit which is not in the working position at the moment, but in the set-up position.
  • the set-up position is that position of a feed unit in which all work to set up the feed unit, ie to prepare the components of the feed unit for operational use, can be carried out.
  • the set-up position can also be referred to as the set-up position.
  • In the set-up position or set-up position is that Feeding unit, which is in the set-up position, set up for a subsequent work process, which work process can then begin when the set-up feed unit is moved into the working position and is ready there to interact with the subsequent forming machine.
  • a special feature of the method is that the straightening unit of that feed unit that is in the set-up position is positioned in a setting station and is set in a setting operation.
  • the device comprises an adjustment station which is arranged and set up in such a way that the straightening unit of that feed unit which is in the set-up position can be set at the setting station in one setting operation or can be adjusted.
  • the straightening units of the feed units are thus adjustable, which means that at least some of the components that come into contact with the workpiece can be changed in their position and/or orientation in a defined manner in order to influence the straightening result.
  • the method and the device enable the straightening unit (the feed unit located in the set-up position) to be set outside of the main time used for the production process, ie in the non-productive time of the forming process.
  • the work required to adjust the straightening unit can therefore be carried out parallel to production and does not impair the productivity of the entire system.
  • the inventors have recognized that adjusting the straightening unit can be very time-consuming, even for very experienced machine operators. Thanks to the invention, all the measures necessary for setting the straightening unit can be carried out parallel to the main time, so that a machine operator can carry out the sometimes difficult setting tasks in a targeted manner without time pressure. If the feed unit whose straightening unit is adjusted to the new workpiece material, for example after a workpiece supply change, is brought into the working position and the new material is threaded into the forming machine, the feed unit delivers workpiece material that has already been straightened, so that at the entrance to the forming machine with regard to conditions defined by the straightening quality are present.
  • the straightening result ie the work result of the straightening operation, should preferably be checked in advance for each new wire of a new workpiece stock before the workpiece material fed to the forming process. For this reason, among others, the adjustment operation also includes a straightness check.
  • an operator can carry out a straightness check purely visually. If necessary, separate devices or aids can also be used to check the straightness, such as a gauge, a ruler or the like.
  • the straightness check can include placing it on a metal sheet with a flat contact surface that is present at the setting station and placing it on an edge in the longitudinal direction of the wire. A 90° rotation of the material can be provided. In this way, any existing curvature (in both planes of the profile material) can be visually determined.
  • the straightness check can also be carried out using an automated device, e.g. a camera-based straightness check device with at least one camera.
  • the results of such a camera test can then either provide the operator with instructions on how to set the straightening device, or set a straightening device with motorized adjustment directly to the correct values by means of a coupling in the controller.
  • the straightness check can be carried out after passing through the straightening unit before the cutting off of a workpiece section on the workpiece passing through or in a continuous process, ie before the workpiece piece section is cut off.
  • the straightness check shows that the straightening quality is not yet sufficient, i.e. that the straightness is not yet within the tolerance, further adjustment operations are carried out on the straightening unit and their effect is checked using another separated workpiece section. If, on the other hand, the straightness is within the tolerance, the straightening unit is fully adjusted and the feed unit is prepared for the next work assignment.
  • a new stock of workpieces is exchanged at the receiving device of the feed unit that is in the set-up position and then the adjustment operation for setting the straightening unit to the workpiece of the new stock of workpieces is carried out before this feed unit is moved into the platform by moving the platform Working position is moved. Arriving in the working position, the feeding unit can immediately start operation by feeding straightened workpiece material.
  • a stationary cutting device can be arranged at the setting station, which can be used in the course of the setting work of the straightening unit to cut off a straightened workpiece section, the straightness of which is then checked.
  • a manually operated cutting device (a so-called hand cut) is provided for this purpose, an automated cutting device with its own cutting drive can also be provided.
  • each of the feed units has an infeed device for conveying the workpiece through the straightening unit.
  • the infeed device can be arranged, for example, in the throughput direction behind the straightening unit, so that the workpiece is first guided by the receiving device through the straightening unit and the downstream infeed device pulls the material to be straightened through the straightening unit.
  • each of the feed units prefferably have a feed device for conveying the workpiece through the straightening unit. It is also possible that an external feed device is used for the workpiece feed or the feed as part of the setting operation, ie a feed device that is not part of a feed unit and is also not located on the movable platform.
  • Some method variants are characterized in that the feed device is actuated to generate a material feed through the straightening unit during the setting operation and/or to thread the workpiece into the forming machine after the straightening unit has been set and before the forming operation, and is disengaged from the forming machine for the operation of the forming machine Workpiece is brought.
  • the feed device can therefore be aired before the productive forming operation begins.
  • the infeed device of the feed unit is only used as an auxiliary device in the run-up to productive operation. Since the forming machines of the type considered here have their own feed device, the task of feeding the material during productive operation can be taken over by this and this machine-internal feed is not disturbed by the disengaged feed device of the feed unit located in the working position.
  • each of the feed units has a feed device for conveying the workpiece through the straightening unit Variants with a pull-in device not arranged on the platform, which remains at the setting station.
  • the platform is mounted such that it can rotate about an axis of rotation in such a way that a change between the first and the second working position of the platform can be carried out by rotating the platform about the axis of rotation.
  • a feed unit initially still in the set-up position can thus be brought into the working position with the aid of a rotary movement, while at the same time the feed unit initially located in the work position is moved into the set-up position.
  • An embodiment with a rotatable platform can be constructed in an extremely compact and space-saving manner since, in principle, the two feed units carried by it can only swap places.
  • a rotary drive is preferably provided for rotating the platform about the axis of rotation, so that the platform can be rotated automatically and without the intervention of a machine operator.
  • the first feed unit and the second feed unit can be constructed essentially identically to one another. They can be constructed on the platform in such a way that the corresponding components of the first and the second feed unit are each arranged essentially point-symmetrically to a point of symmetry lying on the axis of rotation of the platform. This enables an even weight distribution of the components of the feed unit with the center of mass on the axis of rotation, resulting in a stable, easy-to-rotate assembly. Even if the receiving devices are loaded unequally, these advantages are largely retained.
  • a rotatable platform embodiment Another advantage of a rotatable platform embodiment is that the apparatus can be constructed to have only a single adjustment station. The straightening units of the feed units are then rotated alternately into the setting station by rotating the platform.
  • a stationary draw-in device ie one that cannot move with the platform, is arranged at the setting station and is set up to interact with the straightening unit of the feed unit that is in the set-up position during a setting operation.
  • This feed device can be used in the manner of an auxiliary feed device to pull workpiece material through the straightening unit during adjustment work on the straightening unit. So this collection device has no task in the productive operation of the forming machine.
  • the platform is mounted in a linearly displaceable manner in such a way that a change between the first and the second working position can be carried out by a linear displacement of the platform in a displacement direction.
  • first feed unit and the second feed unit can be constructed parallel to one another in such a way that those sides which face the forming machine in the working position are on the same side of the platform.
  • two set-up positions are required, which means that the space requirement is greater than with the rotating variant.
  • the receiving devices of the feed units can be designed differently.
  • the stock of workpieces is provided in the form of a coil on a rotatably mounted coiler.
  • the replaceable reel is picked up by the pick-up device.
  • it can be actively driven with the aid of a reel drive or it can be designed as a passively rotatable reel that is set in rotation by removing workpiece material.
  • the axes of rotation of the coilers are preferably oriented horizontally, but this is not mandatory. An arrangement with vertical axes of rotation of the reels is also possible.
  • a receiving device could also have a non-rotatable, e.g. barrel-shaped container, into which a workpiece supply in the form of a coil can be inserted.
  • One task of the feed units is to feed the workpiece material to the forming machine or its feed device with a suitable speed profile. This can be a challenge, particularly in the case of highly dynamic forming machines that may work with intermittent feed and/or with strongly fluctuating feed speeds and strong accelerations.
  • devices are preferably provided to at least partially compensate for such existing irregularities in the material withdrawal and to ensure a smoother process.
  • a movably mounted deflection device for example in the form of a deflection roller and/or a movably mounted swivel arm for tension and length compensation, can be provided between the receiving device and the straightening unit of a feed unit.
  • a buffer store which can hold a workpiece loop of variable length, to be provided between the receiving device and the straightening unit of a feed unit.
  • an auxiliary feed device downstream of the receiving device is provided between the receiving device and the straightening unit, which can be driven by an auxiliary drive and is configured to convey the workpiece at a definable conveying speed to a downstream buffer store.
  • This has an entry and an exit for the workpiece, the buffer storage being designed in such a way that the workpiece can form a workpiece loop of variable length in the buffer storage between the entry and the exit.
  • a sensor system is provided for detecting the filling level of the buffer store and for generating sensor signals representing the filling level, the control device of the device being configured in such a way that the conveying speed of the auxiliary feed device can be controlled as a function of the sensor signals of the sensor system.
  • FIG. 1 shows an overall view of a wire processing system according to an embodiment with a rotatable platform
  • FIG. 2 shows the wire processing system in a side view in viewing direction II from Fig. 1.
  • FIG. 3 shows a side view according to the observation direction III in FIG. 1 ;
  • FIG. 4 shows an overall view of a wire processing system according to another embodiment with a rotating platform
  • Fig. 5 shows the wire processing system in a side view in viewing direction V from Fig. 4.
  • FIG. 1 shows an overall view of a wire processing system 100 according to a first exemplary embodiment from above.
  • the schematic Fig. 2 shows the wire processing plant in a side view in the viewing direction II from Fig. 1.
  • Fig. 3 shows a side view corresponding to the viewing direction III in Fig. 1.
  • the wire processing system 100 is designed and set up to process elongated workpieces 110 in the form of metallic wires, which are available as a supply of workpieces in the form of a so-called coil, ie a wire bundle wound up in the manner of a coil. From the workpiece material, which is originally available in large lengths from the workpiece stock, more or less large quantities of similar shaped parts are produced in a forming process in a computer numerically controlled manufacturing process.
  • the molded parts can be, for example, helical springs, in particular compression springs or tension springs, or also bent parts with different geometries.
  • Shaped parts can generally be bent two-dimensionally or three-dimensionally, if necessary also straight (e.g. with straightening machines or rod assembly machines).
  • the wire processing plant 100 includes a forming machine 200 which, in the production of helical springs, can be designed, for example, as a spring winding machine. Furthermore, a device 300 for feeding the elongated, wire-like workpiece material to the forming machine 200 is provided, upstream of the forming machine in the direction of material flow. The device 300 is also briefly referred to as the feeding device 300 in this application.
  • the forming machine 200 includes an infeed device 210 which is connected to the control unit 290 of the forming machine and under the control of an NC Control program wire 110, which is supplied by the feed device 300, in the tool area 220 of the forming machine promotes, in which a forming tool or multiple forming tools 222 are arranged.
  • the wire that is fed in is formed into a helical spring or (in the case of other forming machines) into another shaped part by the forming tools downstream in the material conveying direction.
  • the finished molded part is separated from the supplied wire by means of a cutting device, not shown, under the control of the NC control program. This process is repeated cyclically for each molded part to be manufactured.
  • the feed of the wire to the tool area 220 or the drawing in of the wire by the drawing-in device 210 should take place according to a speed profile specific to the production process with a drawing-in speed that varies as a function of time.
  • the feed device 210 which can be configured as a roller feeder or belt feeder, for example, is controlled accordingly.
  • One task of the feed device 300 is to feed the wire to the feed device 210 of the forming machine at any time as precisely as possible at the speed required at that time.
  • the feeding device 300 has its own control unit 390 which communicates with the control unit 290 of the forming machine.
  • the functionalities of the two control units can be integrated in a single control unit.
  • the feeding device 300 comprises a first feeding unit 310-1 (see side view in FIG. 2) and a second feeding unit 310-2 (see side view in FIG. 3).
  • the two feed units 310-1, 310-2 are arranged on a common platform 320, which in the variant shown essentially has the shape of a horizontally aligned plate, which serves as a common support unit for the two feed units.
  • the common platform 320 is rotatably mounted about a vertical axis of rotation 312 so that a change between a first working position and a second working position can be carried out by rotating the platform 320 by 180° about the axis of rotation 312 .
  • a rotary drive not shown, is provided to carry out the rotation, which is connected to the control unit 390 and is controlled by it.
  • the second feed unit 310-2 shows the platform 320 in a first working position, in which the first feed unit 310 - 1 is arranged in a working position which is suitable for transferring workpiece sections to the forming machine 200 .
  • the second feed unit 310-2 is arranged in a set-up position or set-up position. In the set-up position, the second feed unit 310-2 can be set up for a subsequent work process. The activities provided for this take place as part of a setup operation with which the the second feed unit is prepared to be fully operational, so that after it has been pivoted from the set-up position into the working position, it can work together with the forming machine 200 that is then connected downstream with virtually no loss of time.
  • the first feed unit 310-1 and the second feed unit 310-2 are constructed essentially identically to one another, ie have the same components in the same relative arrangement to one another.
  • the components are arranged essentially point-symmetrically to a point of symmetry that lies on the axis of rotation 312 .
  • Each of the feed units 310-1, 310-2 has a receiving device for receiving a supply of workpieces in the form of a coil and a straightening unit for straightening the workpiece before it enters the forming machine, the straightening unit being downstream of the associated receiving device in the material flow direction.
  • the first feed unit 310-1 which is shown in a side view in FIG.
  • the second feed unit 310-2 which is shown in a side view in FIG. 3, has a second receiving device 330-2, which is followed by the second straightening unit 380-2 in the material flow direction.
  • the feeding device 300 includes a setting station 350, which is arranged and set up to enable a machine operator to carry out all the work on the straightening unit that is located in the setting station that is necessary to adjust the straightening unit located there to the workpiece material that is fed through set that the feed unit in productive operation, ie when the feed unit is in its working position, to deliver straightened workpiece material with high straightening quality.
  • the second straightening unit 380-2 is located in the area of the setting station 350 and can be set in a setting operation (cf. FIG. 3).
  • the structure of the first feed unit 310-1 will first be explained in more detail with reference to FIGS. 1 and 2.
  • the stock of workpieces (coil) is held on an exchangeable coiler 335-1, which is picked up by a pick-up device 330-1 and, in the picked-up state, is mounted so that it can rotate about a horizontal axis of rotation.
  • the storage does not take place in the region of the axis of rotation of the reel, instead two axis-parallel support rollers 332-1, 333-1 with horizontal axes of rotation are mounted on the platform 320. These idlers are part of the mounting device 330-1.
  • the reel is placed on the two support rollers so that the circumference of the disc-shaped side elements of the reel rests on the two support rollers and the position of the axis of rotation in space is fixed.
  • it is an active reel with its own drive.
  • the drive 334 - 1 engages and can drive the front support roller 333 - 1 under the control of the control unit 390 .
  • the unwound wire is guided over a deflection device 340, which has an upper deflection roller 340-1 and a lower deflection roller 340-2, which are rotatably mounted on a vertical support 341 with parallel axes.
  • the upper deflection roller is designed as a vertically movable dancer roller with spring return.
  • the drive motor for the support/drive roller is regulated by a position query of this roller.
  • the lower deflection roller is wrapped around approximately three quarters of its circumference in such a way that the outlet, ie the upper side of the lower deflection roller 340-2, is level with the passage opening of the first straightening unit 380-1.
  • a wire guide device 375-1 is located between the deflection device and the straightening unit, the output of which is aligned with the input of the downstream first straightening unit 380-1.
  • a wire end detection device can be integrated into the wire guide device.
  • the first straightening unit 380-1 comprises two roller straightening apparatuses connected downstream of one another, each of which has a number (e.g. from three to nine) of axis-parallel straightening rollers, with the axes of rotation of the straightening rollers of the straightening apparatus connected in series being aligned orthogonally to one another.
  • the axis positions of the individual straightening rollers are individually adjustable in order to be able to set the active geometry of the straightening unit. Due to the large number of degrees of freedom in the setting, a machine operator with a great deal of experience is required to set a straightening unit. In either case, the adjustment operation takes considerable time.
  • the straightening unit 380 is carried by a frame part, in which the control unit 390 of the feed unit can also be accommodated.
  • the frame part also carries a first draw-in device 385-1, which is arranged behind the first straightening unit 380-1 in the material flow direction and serves, among other things, to pull the wire material through this straightening unit in the direction of subsequent components.
  • the feed device 385-1 is designed as a belt feed device and can also be designed as a roller feed or pliers feed in other embodiments.
  • the feeder 385-1 plays an important role in the adjustment operation.
  • the draw-in device could also be arranged in front of the straightening unit.
  • An optional, manually operable clamping device 387-1 is located behind the feed device 385-1 in the material flow direction, with which the axial position of the wire that is fed through can be fixed if necessary.
  • the straightening unit 380-2 of the second feed unit 310-2 and the downstream second infeed device 385-2 and the second clamping device 387-2 arranged behind it are on the platform 320 located in the area of the adjustment station 350.
  • the adjustment station 350 also includes components that are only present once in the feed device 300, namely stationary outside of the platform 320 in the area of the adjustment station 350.
  • These components include a stationary cutting device 370, with which during the adjustment work on the straightening unit a test is made Workpiece sections are cut off from the supplied wire and thus made available for a straightness check.
  • a manually operable cutting device 370 is provided, alternatively an automated cutting device can be provided.
  • a storage device 375 is provided next to and below the cutting device 370, which serves as a storage for separated workpiece sections and can be used, for example, for the straightness check.
  • the storage device 375 On its upper side, the storage device 375 has a flat storage surface with a laterally raised edge, so that a lateral, straight inner edge is formed.
  • an operator can manually roll the severed piece of wire along the storage area and thereby determine the rolling resistance and/or the evenness/irregularity of the unrolling and use it as a measure of straightness.
  • the straightness can also be checked when laying on the edge. In the case of flat material (e.g. with a rectangular cross-section), the straightness can be checked in two orthogonal planes by placing it on the support surface and the edge.
  • all set-up work can be carried out on a feed unit, including all activities related to the correct setting of the straightening unit, while the other feed unit is in its working position in front of the forming machine and can feed wire.
  • the second feed unit 310-2 was previously used until the associated wire supply was used up or was separated by a cutting device in response to a signal from a sensor for detecting the filling level of the reel before the end of the wire was reached .
  • the platform 320 became automatic rotated clockwise by 180° under drive control in order to bring the first feed unit 310-1 into the working position shown for cooperation with the downstream forming machine 200.
  • the second feed unit 310-2 is then in the set-up position.
  • the empty reel is first removed from the support rollers and replaced by a full reel with fresh wire material.
  • a piece of wire that has been pulled off is then guided over the two deflection rollers of the deflection device and fed through the wire guide into the straightening unit 380-2 and through this into the subsequent drawing-in device 385-2.
  • the straightening unit 385-2 in the setting in which sufficiently good straightening results were achieved with the previously used wire will also deliver sufficiently good straightening results with the new wire material right from the start. Therefore, when changing the wire, the straightening unit must be adjusted to the new wire material. For this purpose, a workpiece section of a certain length is pulled through the straightening unit 380-2 with the aid of the feed device 385-2 and conveyed forward so far that the straightened workpiece section is severed from the supplied wire with the aid of the cutting device 370 and falls onto the rod depositor 375.
  • the machine operator can now check this wire section for straightness. If it is round wire, the wire can be unrolled manually on a level depositing surface of the depositing device 375, for example, to see whether the unrolling is sufficiently uniform or whether the rolling resistance is heavily dependent on the rotational position of the piece of wire due to impermissible curvature. If the straightness check shows that the straightness is not yet within the tolerance, the settings on the straightening unit 380-2 must be changed. The machine operator carries this out and then, after straightening the next workpiece section, checks whether the straightness has improved as a result. In this way, the straightening unit 380-2 can be iteratively adjusted to the new workpiece material.
  • the infeed device 385-2 serves as an auxiliary infeed, that is to say as an aid within the scope of the setting operation for advancing successive workpiece sections in each case after setting steps on the straightening unit 380-2.
  • the end of the wire can be clamped using the manual clamping device 387-2.
  • the second feed unit 310-2 is then prepared for productive operation. If the stock of workpieces on the feed unit in the working position is used up, the completely set-up second feed unit with the fresh stock of workpieces can be brought into the working position by rotating the platform by 180°. Then only the front end of the wire has to be threaded into the forming machine or into its feed device 210 .
  • the feed device 385-2 can also be used as an auxiliary feed in order to advance the wire far enough that it can be gripped and conveyed by the feed device of the forming machine. From this point in time, the feed device 385-2 of the feed unit has fulfilled its task of setting the straightening unit and threading in the new wire and is lifted, i.e. disengaged from the wire passing through. From this point on, the feed device of the forming machine then takes over the controlled wire feed.
  • One of the advantages of the concept presented here is that a fully adjusted and threaded straightening unit can be brought into engagement with the forming machine very quickly. As a result, the overall productivity of the wire processing system can be increased, since all the work required for the set-up activities can be carried out parallel to the main time.
  • the straightness check it is possible to carry out the straightness check automatically on the cut-off rod-shaped workpiece sections or before the workpiece sections are separated from the wire using at least one camera.
  • the straightness can also be checked in the run with two cameras offset by 90°.
  • a camera rotating around the wire could be used.
  • FIG. 4 shows a schematic top view of a second exemplary embodiment of a wire processing system 400 . This corresponds in many parts to the exemplary embodiment of FIGS. 1 to 3, so that the same reference numbers are used for those components which are present in the same way in the first exemplary embodiment.
  • a first difference from the first embodiment is that the two feed units on the platform each have no collection device on the Platform 320 is attached in the material flow direction behind the corresponding straightening unit 380-1 or 380-2. Consequently, none of the feed units includes a feed device for conveying the workpiece through the straightening unit.
  • the functionality of the feed during the adjustment work on the straightening unit 380 - 2 in the adjustment station 450 is taken over here by a stationary feed device 495 which is arranged next to the rotatable platform 320 between this and the following cutting device 370 .
  • this feed device 485 takes on the task of step-by-step material feed in order to gradually convey workpieces that have been straightened again and again in the direction of the subsequent cutting device and the depositing device 375, which are then subjected to a straightness check there.
  • the feed device 485 can also be designed as a belt feed or roller feed.
  • this variant has the advantage that a feed device can be saved. However, there is then no separate auxiliary feeder for the task of threading a new piece of wire into the forming machine 200, so that the feed movement must be supported manually until it is threaded into the forming machine.
  • FIG. 5 shows a side view of an exemplary embodiment of a feed unit 510, the structure of which can be identical to the first exemplary embodiment with regard to the arrangement of the straightening unit with a downstream infeed device, which is why the same reference symbols are used for corresponding components.
  • the feed unit 510 is shown in its set-up position, in which the cutting device 370 and the rod depositing device 375 are located behind the feed device 385-2 in the direction of material travel.
  • the 335-2 coiler is a take-off coiler, i.e. a passive coiler without its own drive, whose rotation is caused by the workpiece material being pulled off the outer circumference of the wire bundle. Other differences essentially only exist in the manner of guiding the wire drawn off the take-off reel between the reel and the straightening unit.
  • an auxiliary drawing-in device 520 is provided which is connected downstream of the receiving device and, in the example, is designed as a vertically oriented belt drawing-in and feeds the wire running downwards from the deflection roller 530 into promotes vertical direction down.
  • the auxiliary feed device can be driven using an auxiliary drive, not shown, which can be controlled by the control device 390 of the feed device.
  • a buffer store 550 which is designed to accommodate a vertically hanging workpiece loop of variable length, is located behind the auxiliary infeed device in the direction of material travel.
  • the auxiliary feed device or the auxiliary drive can do that Convey the workpiece (wire) to the downstream buffer store at a definable conveying speed.
  • the buffer store has an inlet through which the wire can enter the buffer store in a vertical direction, and an outlet through which the wire can exit in a horizontal direction approximately coaxially with the direction of travel of the straightening unit.
  • the buffer storage is designed in such a way that the workpiece can form a workpiece loop of variable length in the buffer storage between the entry and the exit.
  • a sensor system 560 is provided for detecting the filling level of the buffer store.
  • the sensor system generates sensor signals that represent the filling level of the buffer storage.
  • the control unit of the device can receive and process these sensor signals and is configured in such a way that the conveying speed of the auxiliary feed device 520 can be controlled as a function of the sensor signals from the sensor system 560 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)

Abstract

L'invention concerne un procédé d'acheminement d'une pièce allongée dans une machine de formage (200) qui a un dispositif d'étirage, qui peut fonctionner à une vitesse d'étirage spécifiable, pour transporter la pièce vers une zone de matrice de la machine de formage, le procédé comprenant les étapes suivantes consistant à : fournir une première unité d'acheminement (310-1) et une seconde unité d'acheminement (310-2), chacune des unités d'acheminement comportant un dispositif de réception (330-1, 330-2), pour recevoir un stock de pièces sous la forme d'une bobine, et une unité d'alignement (380-1, 380-2), en aval de l'unité de réception, pour aligner la pièce avant son entrée dans la machine de formage, la première unité d'acheminement et la seconde unité d'acheminement étant situées sur une plate-forme commune (320) qui peut être déplacée entre une première position de travail et une seconde position de travail. Dans la première position de travail de la plate-forme (320), la première unité d'acheminement (310-1) se trouve dans une position de travail appropriée pour transférer des parties de pièce vers la machine de formage (200) et la seconde unité d'acheminement (310-2) est dans une position d'orientation, et dans la seconde position de travail de la plate-forme, la seconde unité d'acheminement est dans la position de travail et la première unité d'acheminement est dans une position d'orientation. Le procédé est caractérisé en ce que l'unité d'alignement (380-2) de l'unité d'acheminement (310-2) particulière située dans la position d'orientation est positionnée dans une station d'ajustement (350) et est ajustée lors d'une opération d'ajustement, l'opération d'ajustement comprenant un contrôle de rectitude. L'invention concerne également un appareil d'acheminement d'une pièce allongée dans une machine de formage.
EP21773331.0A 2020-10-02 2021-09-02 Procédé et appareil d'acheminement d'une pièce allongée dans une machine de formage Pending EP4221910A1 (fr)

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DE102020212480.9A DE102020212480A1 (de) 2020-10-02 2020-10-02 Verfahren und Vorrichtung zum Zuführen eines langgestreckten Werkstücks zu einer Umformmaschine
PCT/EP2021/074294 WO2022069145A1 (fr) 2020-10-02 2021-09-02 Procédé et appareil d'acheminement d'une pièce allongée dans une machine de formage

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EP4221910A1 true EP4221910A1 (fr) 2023-08-09

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EP (1) EP4221910A1 (fr)
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DE102021212059A1 (de) 2021-10-26 2023-04-27 Wafios Aktiengesellschaft Zuführsystem
IT202200007310A1 (it) * 2022-04-13 2023-10-13 Atop Spa Apparato di gestione delle bobine di cavo in macchine per la formatura di componenti di avvolgimenti elettrici.
DE102022210293A1 (de) * 2022-09-28 2024-03-28 Felsomat Gmbh & Co. Kg Verfahren und Fertigungsanlage zum Herstellen von Stableitern

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CH542671A (de) 1972-09-04 1973-10-15 Schlatter Ag Einrichtung zum Zuführen eines drahtartigen Materialstranges an einen intermittierend arbeitenden Verbraucher und Verwendung derselben an einer Gitterschweissmaschine
AT400934B (de) 1988-11-30 1996-04-25 Evg Entwicklung Verwert Ges Verfahren und anlage zum zuführen von längselementen aus rund- oder flachmaterial zu einer durchlauf-schweissmaschine für gitter oder gitterroste
IT1239666B (it) * 1990-03-15 1993-11-11 Piegatrici Macch Elettr Aspo rotante a revolver
IT1252963B (it) * 1991-10-15 1995-07-07 Piegatrici Macch Elettr Dispositivo multifunzionale per rotoli di profilati
ITUD20060148A1 (it) * 2006-06-08 2007-12-09 Piegatrici Macch Elettr Dispositivo alimentatore per barre metalliche, e relativo procedimento
RS59236B1 (sr) * 2016-03-15 2019-10-31 Komax Holding Ag Uređaj za obradu kablova
AT518731B1 (de) 2016-05-27 2019-05-15 Progress Holding Ag Richtmaschine
DE102018102914A1 (de) 2018-02-09 2019-08-14 Grob-Werke Gmbh & Co. Kg Vorrichtung und Verfahren zur Zuführung von Draht in eine Produktionsanlage für Maschinenelemente elektrischer Maschinen
DE102019206556A1 (de) 2019-05-07 2020-11-12 Wafios Aktiengesellschaft Verfahren und Vorrichtung zum Zuführen eines langgestreckten Werkstücks zu einer Umformmaschine

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US20240091845A1 (en) 2024-03-21
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