DE19617179C2 - Device for electromagnetic clamping and for connecting, in particular welding, the end regions of metal sheets - Google Patents

Description

The invention relates to a device for electromagnetic clamping and connecting, in particular welding, the end regions, edges, ends or. Like. From at least one optionally ferromagnetic sheet, z. B. Steel sheet or the like, with each other with a plurality of with one Cooling device provided electromagnetic clamping elements on both sides a connection to be provided, e.g. B. weld and a device for Connecting the end regions or the like. And supports for the same.

Such a device is known from DE 94 19 960.4 U1. This Known jig has two permanent magnets and one between this arranged cooling device. In addition to the permanent magnets can still be provided electromagnets, depending on the direction of the windings flowing current either the effect of the Support or cancel permanent magnets. The pole pieces and that Polleitstück lie in a common horizontal plane and form one Clamping surface for the sheets.

DE 39 13 366 A1 discloses a holding device for decorative grille parts described. This device consists essentially of a bottom arranged sheet of a "magnetizable" material and a Module that has a permanent magnet on its underside. In addition holes are provided in the top of the block, in which pins can be used. The blocks can be placed on the sheet metal at any Place be arranged because there are none for the permanent magnet in the block specific position on the sheet metal is required to hold on. The too  connecting parts, e.g. B. metallic flourishes with a metallic decorative rod are held by the pins that can be inserted into the module.

With the known devices described, only sheets can be used maintain ferromagnetic properties.

In CA-B-321 599 an arc welding machine is described, wherein the sheet metal plates to be connected via electromagnetic clamping plates are held. Between the electromagnetic holding the sheets directly A metal rail is arranged above which the Weld is placed. In this rail a heating tube is arranged, which for Heating the weld seam serves to prevent embrittlement from being too fast To prevent cooling.

Another electromagnetic clamping device, namely for Submerged arc welding of sheets, is known from DE-A-11 13 527, the sheets to be connected via electromagnetic clamping elements be held directly. Both between the clamping elements along the gutter, which is filled with welding powder, as well as the electromagnetic clamping elements are attached to pressure hoses that can be pressurized, positioned exactly in their horizontal position. The Clamping elements can be protected by the hoses during the application of the sheets are not pressurized, so that the same can lower, whereas in the working position the hoses are pressurized and the electromagnetic clamping elements to the Sheets can be raised.

DD-A-223 385 becomes a belt tensioning device for a Cross welding device for connecting metal strips of steel or the like. known, during the welding process at the beginning of a heat build-up and  the resulting penetration crater should be prevented. A sticking the edge areas of the sheets are hydraulically or pneumatically operated Cylinder, medium clamps to hold in a first step the sheets are actuated, and on both sides to the ends of the intended Weld sheet metal in the thickness of the metal sheets to be joined in the system the start and finish of the weld is carried out so that the penetration craters in the later to be rejected Pieces of sheet metal are provided. These pieces of sheet metal are together with the connecting sheets via outer also hydraulic or pneumatic actuated clamps held.

In DE-A-15 65 632 a magnetic jig for welding plates described. This device assigns on both sides of the forming a weld seam each on a series of electromagnets. The The supports for the sheets are supported by a U-shaped cross-section formed, which from an insert immediately adjacent to the weld Has copper. This insert, which during the welding process can be subjected to heat, is provided with indirect water cooling, so that the heat input during the welding process from the pad can be compensated. The present invention is based on a prior art Technology from how it is given by this German interpretation.

The known electromagnetic clamping devices, if necessary with a device for connecting sheet metal edges, has the disadvantage that the clamping forces exerted on the sheets to be clamped, are directly dependent on the magnetic properties of the sheets and that this does not result in a uniform, flat clamping of the edge areas simple measures is guaranteed.  

The inventive device for electromagnetic clamping and Connect, in particular welding, the end regions, edges, ends or Like., of at least one optionally ferromagnetic sheet, z. B. Steel sheet or the like, with each other with a plurality of with one Cooling device provided, electromagnetic clamping elements on both sides a connection to be provided, e.g. B. weld and a device for Connecting the end regions or the like., And supports for the same consists in essential in that the electromagnetic clamping elements for the / ferromagnetic (s), paramagnetic (s) or diamagnetic (s) sheet (es) with at least - preferably one - tensioning strip are connected that at least one ferromagnetic armature for the electromagnetic clamping elements and a one-part or multi-part carrier with supports for the end regions or the like Sheets (it) is provided.

The fact that the electromagnets are connected to each other, especially in a clamping bar are arranged, and at least one opposite each Ferromagnetic armature is arranged, the force can be exerted by the Attraction of the armature to the electromagnet, which is the Clamping process as such is not directly dependent on the magnetic Properties of the sheet (s) to be joined. The tension bar with the Electromagnets can easily be adjusted so that all electromagnets are aligned so that an even application of force on the Sheet through which the anchor is made possible. As a particularly exact one for sheet metal Alignment, especially for long lengths, such as those used in the Production of endless metal strips for band machines, band presses or Like. is required, the  Electromagnets can exert high forces. The high strength exercise requires a high energy supply, but due to the electrical resistance of electromagnets the same one Subject to heating, with which the sheets to be joined are also be heated. This occurs between the remaining areas of the ligaments and a particularly high mechanical connection Tension on the one hand leads to undesirable burdens of the Lead edge areas and on the other hand faults or the like. can condition. By tempering, especially cooling, of the electromagnet to the temperature of the to be connected Sheets, for example room temperature, can be extremely difficult desired thermal stresses significantly reduced or be avoided.

Is / are in addition to at least one tensioning strip, in particular too two clamping strips each, one clamping device for one end area or the like. Provided, the clamping device (s) lengthways and movable and positioned transversely to the connection to be provided are arranged fixable, so regardless of the later Fixing the end areas or the like of the sheet (s) an exact Alignment can be done. Such alignment is however, in addition to an exact positioning of those to be connected Marginal areas an essential requirement that appropriate Connections, for example welding seams can, with mobility in two directions It is clear that there is no mutual shift in the direction the connection exists. When the two end areas are fixed in position are then the electromagnetic clamping with the correspondingly high effort, which then any Possibility of moving is excluded.

A particularly simple yet exact constructive solution Education of the clamping device is when the clamping  device formed with mechanically actuated clamping elements is because they have a small footprint and on the other hand, with appropriate training high, albeit Allow forces to be applied at points.

Is the clamping device, especially over spindle drives, lengthways and movably arranged transversely to the connection to be provided, so z. B. corresponding to the threads of the spindle drives exact positioning can be carried out, and can be adjustable, neither heat force accelerated adjustment or the like.

Is the clamping device for clamping the end area (s) or the like. Independent of the electromagnetic clamping elements movable longitudinally and transversely to the connection to be provided, so can a particularly stable electromagnetic clamping device be created, the clamping device only lower forces during the adjustment work for the end regions or the like must exercise.

Is at least one tension bar on one of the electromagnetic Provided clamping elements partially covering hollow profile, so can due to the protected arrangement of the electro magnetic clamping elements an exact positioning of the same done together with the tension bar.

Are the electromagnetic clamping elements with the hollow profile detachably connected, so a particularly simple exchange can Fault, but also adjustment of the same.

Is the tempe between the clamping elements and the hollow profile Riereinrichtung, in particular cooling device, is arranged on the one hand, the temperature control device also before mechanical  Impairments protected while maintaining a temperature moderate equalization of the clamping elements is supported.

Is the tempering device with a tube bundle for a heat carrier fluid built up, preferably in the direction of the longitudinal Extension of the hollow profile extends, the calorific value of the electromagnetic clamping device can be increased, with which particularly high temperature constancy of the clamping device too can be achieved with external influences.

Is the temperature control device with at least one Peltier element built, so can only with an electrical thermo switch and power supply a highly sensitive temperature regulation of the clamping elements can be realized.

Are clamping on both sides of the electromagnetic clamping elements afford arranged, the, especially continuously, stops for have an end region of the sheets, so with a corresponding one Positioning the clamping elements a strong mechanical Beauf striking the same through the sheet (s) to be joined can be avoided, thus mechanical damage to the electromagnetic clamping elements is stopped.

Touch the stops for the end areas or the like along a route, so can be a particularly precise alignment the end areas and a flat system.

Is a level together with the end regions or the like acting surfaces and / or stretching the stops of the instep can define which does not touch the clamping elements, so ensure that the clamping elements are not mechanical Damage caused by the sheets.  

If the hollow profile is constructed with ferromagnetic material, then can any magnetic interference, for example in the Place the weld seam as shielding the electromagnetic table clamping elements is reached, avoided.

Are the clamping elements of the clamping devices on both sides in Attack the area of the connection to be provided from the surface the sheets can be moved and / or disassembled mechanically, so after making the connection, for example the weld seam, an easy removal of the connected sheets, for example the to form an endless sheet of joined sheet, without interference from the clamping elements.

If the tensioning strips are mechanically connected to the carrier, so can also be removed particularly easily, so that a Removal of the electromagnetic jig, gege if necessary, can be done together with the clamping device.

Are the tensioning strips connected to an auxiliary support, which is mechanically detachably connected to the carrier, so that electromagnetic clamping elements with a simple working the process is connected to or detached from the carrier, so that both the fixation of the sheets and the removal of the Sheets are not subject to any significant disability.

Is at least one armature made of ferromagnetic material, e.g. B. Soft iron, with the carrier over slide, especially paramagne table, material connected, so a preferred next Conduction of the electromagnetic flow in the carrier essentially prevented.

A particularly exact positioning of the end to be connected areas are present when they are attached to the end areas  or the like. Arriving areas of the support of the carrier and the at least one anchor lie in one plane.

Is between the supports of the carrier, which of the to be provided Connection are adjacent, a groove is provided in the carrier, the one insert made of copper, another with iron alloys non-weldable material, so can, as such known to support the to be formed during welding Weld seam or end areas are easy.

Is the device for connecting the end regions or the like TIG welding device is an effective welding device given with a particularly small footprint.

The device for connecting to the carrier is mechanical releasably connected, so a mechanically easily removable Device for clamping and welding can be reached, whereby exact positioning is made possible at the same time.

Is the device for connecting to at least one rail movable along the connection to be provided, so a easy control of the movement of the device can be achieved.

Connect at least one rail to a rail section bar, which is measured so that the device for connecting removable from the rail together with the rail section is between the rail and a guide for the one direction for connecting a particularly small game provided be, while at the same time an exact guidance of the device the rail is possible and the assembly of the connectors direction is possible without significant effort.  

Is the rail with a clamping bar, especially over the hollow profile, connected, so is the relation between tensioning bar, Clamping elements and possibly the device for ver tie, particularly easily taken into account.

If the device for connecting has an electric motor, which this over a gear and a rack along the provided connection moves, so can be a particularly simple control of the movement of the connecting device respectively.

Are the electromagnetic associated with a tensioning strip Clamping elements electrically connected in parallel, are essentially Lichen equal forces that the electromagnetic clamping elements exercise, guaranteed, furthermore in the event of failure of an electro magnetic clamping element the other clamping elements are still full stay in function.

To ensure that an exchange of faulty electro magnetic clamping elements from malfunctions of the up every single electromagnetic tension element a signal generator, for. B. a glow lamp for the through flow of electricity on.

The invention will be described in more detail below with reference to the drawings explained.

Show it:

Fig. 1, a magnetic clamping device including Schweißeinrich tung, partly in cross-section,

FIG. 2 shows a partial top view of the device according to FIG. 1,

Fig. 3 shows a hollow profile with an electromagnetic clamping element in the view from below.

The device for electromagnetic clamping shown in FIG. 1 has a multi-part carrier 1 with plate 2 . The plate 2 is provided with supports 3 for the sheet 4 . For the sake of clarity, only one end region 4 a of the sheet 4 , u. between the right part in FIG. 1, whereas the end of the sheet has not yet been inserted in the left part. Several sheets, e.g. B. two sheets, are welded together, or the end regions of only one sheet are welded together, so that an endless band, pipe or the like. Both magnetic and non-magnetic sheets are suitable for joining, that is, steel sheets, but also high-alloy sheets which can only have di-, even paramagnetic, properties.

A groove 5 is formed by the two middle supports 3 , in which an insert 6 made of copper is arranged. The connecting weld seam is placed along the insert. Between the supports 3 , each of which carries an end region of a sheet, a ferromagnetic armature 7 made of soft iron is provided, which is connected to the carrier via diamagnetic material, and the like. between copper screws 8 , with the interposition of a copper strip 9 . Above the magnetic armature 7 , electromagnetic clamping elements 10 are provided in two hollow sections 11 made of steel. The power supply of the electromagnetic clamping elements, that is, the electromagnet, takes place via two copper bars 12 , 13 , which are electrically insulated from the hollow profile 11 and have a cover 15 . The tensioning elements are electrically connected in parallel, each electromagnet having a glow lamp 14 , which also does not light up when electromagnets are not flowing through current, so that it can be determined in the case of electromagnets under current which individual is not functioning. The cover 15 of the hollow profile is transparent, so that the glow lamp 14 can also be protected by the cover. Between the hollow profile 11 and the electromagnetic clamping elements 10 tube bundle 16 are provided, through which water kept at room temperature is pumped so that the sheet is cooled to room temperature. Instead of the tube bundle 16 , other cooling elements, such as Peltier elements, can also be arranged.

The supports 3 of the support 1 lie, as can be clearly seen in the right half of the drawing, in one plane, whereas the hollow profile 11 has two legs which serve as tensioning strips 17 , 18 and have continuous stops 19 which are at the level of the to be connected Sheet 4 are inclined. The stops 19 touch along the route 19 a, the sheet 4 , the plane to be laid through the route 19 a not touching the electromagnetic clamping elements 10 . The sheet 4 is thus clamped between the supports 3 and the stops 19 , the force being exerted by the interaction of the electromagnetic clamping elements 10 and the magnetic armatures 7 . The hollow profiles 11 have guides 20 at their respective two ends, along which the hollow profiles enable movement to and from the sheet metal 4 via a bolt 21 connected to the carrier. A clamping device 22 adjoins the hollow profiles 11 on the outward-facing side. This clamping device is in two parts, u. arranged on both sides of the sheets to be connected, positioning being possible via spindle drives 23 and 24 transversely or along the connection to be made. Clamping of the end regions of the sheets takes place via pushed-on clamping elements 25 , which can be pulled off in both directions from the end of the clamping device. The sheets can be fixed in each case via screw bolts, not shown, so that the sheets are positioned precisely with respect to the clamping devices, and the spindle drives 23 and 24 have a parallel alignment of the end regions 4 a of the sheet to be connected or joined (e ) 4 is easy to do.

The welding device 26 is movable along a rail 27 which is carried by a hollow profile 11 . The program-controlled movement of the welding device takes place here via an electric motor 28 , a toothed rail 29 and a toothed wheel 30 which is rotated by the electric motor 28 . The welding device is a protective gas welding device (TIG) with tungsten tip 31 , which can also be controlled in a program-controlled manner depending on the current strength in its distance from the metal sheets. The welding can be done with filler metals or without.

As can be seen from FIG. 2, a rail 27 is fastened on a hollow profile 11 , in which a partial rail piece 32 can be inserted, which the welding device 26 can carry. In this figure, the spindle drives 23 , 24 can also be seen particularly clearly, which serve for the exact adjustment of the metal sheets 4 . Parallel to the connection 33 to be provided of the end regions 4 a of the sheets 4 are bars 34 which carry screw bolts 35 for mechanically fixing the sheets 4 .

The rail 11 shown in Fig. 3 in view from below has a plurality of electromagnetic clamping elements 10 , the arrangement being such that ring-like electromagnets are present and the ring-shaped south poles S with an outer diameter of 25 mm in a row and the north poles N in another row are arranged. This ensures a particularly effective magnetic circuit between electromagnetic clamping elements and the magnetic armatures, not shown in this figure.

When connecting end regions of a sheet, for example a strip for a strip device, the procedure is now such that the strip is introduced into the manual system to be put into operation later, for example a cooling strip, and the carrier 1 is positioned below the two strip ends . This is followed by a provisional arrangement of the bars 34 and a fixation of the band end regions 4 a via the screw bolts 35 . As a next step, a preliminary parallel alignment of the end regions of the sheet can take place. Then the hollow profiles 11 are brought into contact with the electromagnetic clamping devices 10 via the guide 20 and bolts 21 . The end regions 4 a of the metal sheets 4 rest on the supports 3 , and a desired alignment of the end regions of the metal sheets to one another can take place via the spindle drives 23 and 24 . Either before or after the electromagnetic clamping elements are supplied with current, the partial rail piece 32 can be connected to the rail 27 together with the welding device 26 . Simultaneously with the electrical application of the electromagnetic clamping elements 10 , the tube bundles 16 are acted upon by a cooling medium which is set below the ambient temperature, for example 17 ° C. The sheets 4 , which are also at room temperature, are therefore not subject to additional thermal stresses during the holding process by the electromagnetic tensioning elements 10 . The electro-magnetic clamping elements are each flowed through with a direct current of 24 volts, 0.6 amps. The welding device 26 , a TIG welding torch, is moved along the weld connection to be provided at a speed of 150 mm / min. After completion of the welding process, both the clamping device and the electromagnetic clamping devices are loosened and pulled upwards, the same being moved back to the partial rail 32 to remove the welding device and the same welding device can be removed from the rail 27 . The carrier 1 can then be moved laterally under the now verbun which and thus endless sheet, so that a connection of the sheet, which was already provided in a belt system, was carried out.

Claims (29)

1. Device for electromagnetic clamping and connecting, in particular welding, the end regions ( 4 a), edges, ends or the like. Of at least one optionally ferromagnetic sheet ( 4 ), z. B. steel sheet or the like., With each other with a plurality of provided with a cooling device electromagnetic clamping elements on both sides of a connection ( 33 ) to be provided, for. B. weld and a device for connecting the end regions or the like., And supports ( 3 ) for the same, characterized in that the electromagnetic clamping elements ( 10 ) for the / the ferromagnetic (s), paramagnetic (s) or diamagnetic (n ) Sheet metal (e) with at least - preferably one - clamping bar ( 17 , 18 ) that at least one ferromagnetic armature for the electromagnetic clamping elements ( 10 ) and a one-part or multi-part carrier ( 1 ) with supports ( 3 ) for the end regions ( 4 a) or the like. The / the sheet (es) ( 4 ) is provided. 2. Device according to claim 1, characterized in that it has a temperature control device ( 16 ). 3. Apparatus for electromagnetic clamping and for connecting according to claim 1 or 2, characterized in that in addition to at least one clamping bar ( 17 , 18 ), in particular two clamping bars each, a clamping device ( 22 ) for an end region ( 4 a) or The like. is provided, the clamping device (s) ( 22 ) being arranged to be movable and fixed in position longitudinally and transversely to the connection to be provided. 4. Apparatus for electromagnetic clamping and for connecting according to claim 3, characterized in that the clamping device ( 22 ) with mechanically actuated clamping elements ( 25 ) is formed. 5. Apparatus for electromagnetic clamping and for connecting according to claim 3 or 4, characterized in that the clamping device ( 22 ), in particular via spindle drives ( 23 , 24 ), is arranged movable longitudinally and transversely to the connection ( 33 ) to be provided. 6. Apparatus for electromagnetic clamping and for connecting according to claim 3, 4 or 5, characterized in that the clamping device ( 22 ) for clamping the / the end areas (s) ( 4 a) or the like. Independent of the electromagnetic clamping elements ( 10 ) can be moved longitudinally and transversely to the connection ( 33 ) to be provided. 7. The device for electromagnetic clamping and for connecting according to one of claims 1 to 6, characterized in that at least one clamping bar ( 17 , 18 ) on one of the electromagnetic clamping elements ( 10 ) partially covering the hollow profile ( 11 ) are provided. 8. Apparatus for electromagnetic clamping and for connecting according to claim 7, characterized in that the electromagnetic clamping elements ( 10 ) with the hollow profile ( 11 ) are detachably connected. 9. Apparatus for electromagnetic clamping and for connecting according to claim 7 or 8, characterized in that between the clamping elements ( 10 ) and the hollow profile ( 11 ), the temperature control device ( 16 ), in particular cooling device, is arranged. 10. Apparatus for electromagnetic clamping and for connecting according to claim 9, characterized in that the temperature control device ( 16 ) is constructed with at least one tube bundle for a heat transfer fluid, which preferably extends in the longitudinal direction of the hollow profile ( 11 ). 11. Device for electromagnetic clamping and for connecting according to one of claims 1 to 10, characterized in that the temperature control device ( 16 ) is constructed with at least one Peltier element. 12. Device for electromagnetic clamping and for connecting according to one of claims 1 to 11, characterized in that elements on both sides of the electromagnetic clamping elements ( 10 ) clamping strips ( 17 , 18 ) are arranged, which, in particular continuous, stops ( 19 ) form for each end area ( 4 a) of the sheets ( 4 ). 13. Device for electromagnetic clamping and for connecting according to claim 14, characterized in that the stops ( 19 ) for the end regions ( 4 a) or the like. The same ent along a distance ( 19 a) touch. 14. Device for electromagnetic clamping and for connecting according to claim 12 or 13, characterized in that a plane which by means of the end regions ( 4 a) interacting surfaces and / or stretches ( 19 a) of the stops ( 19 ) of the clamping bar ( 17th , 18 ) is formed, does not touch the electromagnetic clamping elements ( 10 ). 15. Device for electromagnetic clamping and for connecting according to one of claims 7 to 14, characterized in that the hollow profile ( 11 ) is constructed with ferromagnetic material. 16. The device for electromagnetic clamping and for connecting according to one of claims 3 to 15, characterized in that the clamping devices ( 22 ) attack on both sides in the area of the connection to be provided ( 33 ) and clamping elements ( 25 ) od at the end regions. Attack the like, are mechanically movable and / or removable from the surface of the sheets ( 4 ). 17. The device for electromagnetic clamping and for connecting according to one of claims 1 to 16, characterized in that the clamping strips ( 17 , 18 ) are mechanically detachably connected to the carrier ( 1 ). 18. Device for electromagnetic clamping and for connecting according to one of claims 1 to 17, characterized in that the clamping strips ( 17 , 18 ) are connected to an auxiliary carrier, in particular the hollow profile ( 11 ), which is mechanically connected to the carrier ( 1 ) is detachably connected. 19. Apparatus for electromagnetic clamping and for connecting according to one of claims 1 to 18, characterized in that at least one armature ( 7 ) made of ferromagnetic material, for. B. soft iron, is connected to the carrier ( 1 ) via slide or paramagnetic material. 20. Device for electromagnetic clamping and for connecting according to one of claims 1 to 19, characterized in that the supports ( 3 ) for the end regions ( 4 a) or the like. The sheets ( 4 ) of the carrier ( 1 ) and one The effective area of at least one anchor ( 7 ) lie in one plane. 21. Apparatus for electromagnetic clamping and for connecting according to one of claims 1 to 20, characterized in that between the supports ( 3 ) of the carrier ( 1 ) which are adjacent to the connection ( 33 ) to be provided, a groove ( 5 ) in Carrier ( 1 ) is provided, which has an insert ( 6 ) made of copper or other material not weldable with iron alloys. 22. Apparatus for electromagnetic clamping and for connecting according to one of claims 1 to 21, characterized in that the device ( 26 ) for connecting the end areas or the like is a TIG welding system. 23. The device for electromagnetic clamping and for connecting according to one of claims 1 to 22, characterized in that the device ( 26 ) for connecting to the carrier ( 1 ) is mechanically detachably connected. 24. Device for electromagnetic clamping and for connecting according to one of claims 1 to 23, characterized in that the device ( 26 ) for connecting to at least one rail ( 27 ) along the connection ( 33 ) to be provided is movable. 25. Device for electromagnetic clamping and for connecting according to claim 24, characterized in that the at least one rail ( 27 ) with a rail section ( 32 ) can be connected, which is dimensioned such that the device ( 26 ) for connecting together with the rail section ( 32 ) from the rail ( 27 ) is removable. 26. The device for electromagnetic clamping and for connecting according to claim 24 or 25, characterized in that the rail is connected to a tensioning strip, in particular via the hollow profile ( 11 ). 27. The device for electromagnetic clamping and connecting according to one of claims 1 to 26, characterized in that the device ( 26 ) for connecting has an electric motor ( 28 ) which via a gear ( 30 ) and a toothed rail ( 29 ) Device ( 26 ) moves along the connection ( 33 ) to be provided. 28. Apparatus for electromagnetic clamping and for connecting according to one of claims 1 to 27, characterized in that the electromagnetic clamping elements ( 10 ) associated with a clamping strip ( 17 , 18 ) are electrically connected in parallel. 29. Device for electromagnetic clamping and for connecting according to one of claims 1 to 28, characterized in that each individual electromagnetic clamping element ( 10 ) has a signal generator, for. B. glow lamp ( 14 ) for the flow of electricity.