EP2872284A1 - Tête de soudage pour recevoir un bloc-ressort - Google Patents

Tête de soudage pour recevoir un bloc-ressort

Info

Publication number
EP2872284A1
EP2872284A1 EP13730559.5A EP13730559A EP2872284A1 EP 2872284 A1 EP2872284 A1 EP 2872284A1 EP 13730559 A EP13730559 A EP 13730559A EP 2872284 A1 EP2872284 A1 EP 2872284A1
Authority
EP
European Patent Office
Prior art keywords
spring
electrode
welding
spring assembly
welding head
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.)
Withdrawn
Application number
EP13730559.5A
Other languages
German (de)
English (en)
Inventor
Johann Kaussler
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP2872284A1 publication Critical patent/EP2872284A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/30—Features relating to electrodes
    • B23K11/31—Electrode holders and actuating devices therefor
    • B23K11/318—Supporting devices for electrode holders

Definitions

  • the invention relates to a welding head for carrying out the resistance welding, resistance soldering or hot riveting, wherein the workpieces to be joined by resistance heating at the same time exerted compressive force (welding force) on a joint (welding the so-called. Welding) bonded together or via solder become.
  • resistance welding In resistance welding, two electrically conductive workpieces are heated by an electrical current flow until they melt. The melt solidifies after the flow of current and forms a welded joint. In this case, the formation of an intimate connection is possibly supported by compression during and after the flow of current (resistance - pressure welding). Resistance welding generally takes place without supply of additional material. Resistance spot welding as a special form of resistance welding is used, for example, to join steel sheets in bodywork and vehicle construction. But it also serves to weld aluminum or other metals, eg. As in the manufacture of capacitors, terminals of coils and motor windings or contact sets for relay and line
  • Circuit breaker Resistance spot welding offers the advantage of concentrating a high energy in the form of electric current in a short time on a small area of a workpiece, whereby a non-detachable connection is created under application of high pressure, which is applied pneumatically or electromechanically.
  • welding heads are known for the described fields of application. These carry an electrode, which are movably mounted in the direction of a counter electrode. The workpieces to be joined are first posi - tioned between the two electrodes and then pressed onto the counterelectrode by a movement of the electrode of the welding head. During the bonding process, a required process temperature and welding force lead to a softening of the material, which leads to a so-called repositioning of the welding head due to the pressure of the electrodes on the workpieces.
  • a welding force that is, the pressing force exerted by the electrode on the workpieces
  • a force sensor is positioned between the electrode and a workpiece carrier receptacle to measure the welding force.
  • this direct type of measurement is different and expensive for each application.
  • WO 2012045763 AI a resistance welding head for resistance welding and soldering is known. Due to its physical structure, this resistance welding head is able to absorb very large forces above 2000 N. Of the Power flow from a pneumatic cylinder to the electrode is in line. Therefore, no moments of force occur.
  • the movable part of the welding head has a low mass, which favors a quick readjustment.
  • the welding force is measured directly in the force flow and can be queried continuously. It remains almost constant during the welding process and is very precisely adjustable.
  • the welding head is designed according to a platform concept and can be mounted in any position. The repositioning is realized by a compression spring.
  • the welding head is suitable for carrying out resistance welding. Due to its physical structure, it is able to convert even very large forces with a fast setting behavior and to keep the change in the welding force during the process negligibly small.
  • This welding head is shown in Figures 1, 2a, 2b, 3 and 4 of the present application.
  • the invention has for its object to provide a welding head, which allows a quick conversion for different applications.
  • a welding head with a drive and a movably mounted electrode.
  • the welding head has an installation position for receiving a self-contained and replaceable spring assembly, wherein the spring assembly is arranged in the installed position in the power flow between the drive and the electrode.
  • the installation position for the spring package provides great flexibility in terms of a bandwidth of required spring forces ready.
  • the welding head can be retrofitted easily and quickly for various processes in terms of process substitution.
  • a suitable spring package must be used only in the installation position. Further assembly steps such as screwing are not mandatory.
  • the spring pack installed in the welding head offers the advantage that it controls the trajectory of the welding head and at the same time keeps the welding force almost constant during the process.
  • the spring package thus allows an optimal and very fast Nachsetz the electrode during welding.
  • the welding head can therefore be used for the most demanding non-ferrous metal welds.
  • the construction also allows a compact construction of the welding head. As a result, ergonomic and semi-mechanized solutions are possible. Furthermore, an installation position of the welding head is arbitrary. Also, the welding head can be easily isolated. The compact design also allows the use of the welding head as a basic concept in the context of a platform concept that uses this resource. Also, the welding head can be used by its movable electrode for different material flow systems such as slide holder, turntable or workpiece carrier. According to one embodiment, the welding head includes a frame which is adapted to receive the spring assembly. In a further development, the frame has a recess through which the spring assembly, in particular for setting a bias of the spring assembly, remains accessible externally even when installed.
  • the spring assembly can be quickly and easily inserted and removed through the recess. Furthermore, the recess offers the advantage that the setting of a bias of a compression spring of the spring assembly can be carried out in the installed state through the recess.
  • the frame in the axial direction of the spring assembly has a round opening with an internal thread.
  • the welding head includes a piston rod, which is movably guided by a spring-locking screw, which forms a back stop for a head of the piston rod.
  • the spring locking screw can be screwed with an external thread in the frame so that the head of the piston rod is pressed by the spring locking screw on the spring assembly and applies an additional bias on the compression spring of the spring assembly.
  • the head of the piston rod is shaped to produce a positive connection with the spring assembly.
  • the head of the piston rod has a central recess, which is dimensioned for receiving one end of a rigid axially arranged in the spring assembly guide pin upon compression of the spring assembly.
  • This embodiment has the advantage that the head of the piston rod forms a positive connection with the spring assembly.
  • the head of the piston rod slightly encompasses one end of the spring assembly. This ensures that the spring pack can not pop out even under high pressure forces under any circumstances.
  • the central recess has the advantage that a spring assembly with a short axially arranged in the spring assembly guide pin can be inserted into the welding head. Such a spring package has a very compact and modular form of construction.
  • the welding head has a water connection and a cooling water feedthrough, which is set up to cool the electrode.
  • the welding head has a power connection and an insulation, which electrically isolates the frame from the electrode, so that a current path through the spring assembly and the drive is excluded.
  • the drive, the spring assembly, a force sensor and the electrode are arranged in a line, so that a line of action of a force which acts on the electrode starting from the drive or the spring package, centric by the force sensor and the electrode runs.
  • the linear arrangement of drive, spring assembly and electrode optimizes the Vietnamesesetz the electrode, since no force moments between the drive and the joint or between the elastic member and the joint may occur. A moment of force would cause increased friction in guides of the electrode and a higher inertia and thus a poor Nachsetz the welding head entail.
  • the welding head allows optimally designed control of the Nachsetz s, which is realized in the immediate vicinity of the joint.
  • the welding head is set up to move the electrode in synchronism with the drive, as long as the
  • Electrode abuts no workpiece by a compressive force is exerted by the drive to the electrode. Furthermore, the welding head is arranged for a decoupling of the electrode from the drive and for a movement of the electrode relative to the drive by means of the spring assembly, as long as the electrode rests against a workpiece.
  • the spring assembly for transmitting the welding force is arranged on the electrode and designed for controlling a Nachsetzmony of the electrode relative to a workpiece.
  • the aforementioned embodiment offers the advantage that the spring pack regulates the Nachsetzweg while maintaining the welding force during the process almost constant.
  • the spring assembly thus enables optimum Nachsetz the electrode during welding.
  • the welding head can therefore be used for the most demanding non-ferrous metal welds.
  • the welding head is adapted to advance the electrode by one electrode stroke during extension of a piston rod until the electrode touches a workpiece. It is further adapted for compression of the spring assembly by a spring travel during extension of the piston rod after the electrode has placed on the workpiece, wherein the spring travel is the difference of a cylinder stroke and the electrode stroke and defines together with a bias of the spring assembly, a welding force, which the workpiece is exercised.
  • Welding head adapted to feed the electrode by a Nachsetzweg during a welding operation using the spring assembly, wherein the compression of the spring assembly is reduced by the Nachsetzweg.
  • the welding head has a switch, in particular a contactless limit switch with fed-back oscillator.
  • the switch is set up to detect a relative movement between the electrode and the piston rod, which is produced by overpressing the spring assembly after placing the electrode on a workpiece.
  • the welding head further includes a controller, which releases a welding current when relative movement is present and releases no welding current in the absence of relative movement.
  • the piston rod is provided with a fine thread.
  • an upper lock nut is screwed to stop with an upper adjusting nut, the upper adjusting nut strikes against a component in return of the piston rod, whereby a stroke of the piston rod is limited.
  • a lower lock nut is screwed to stop with a lower adjusting nut on the piston rod, the lower adjusting nut at feed the Piston rod abuts against a component, whereby the stroke of the piston rod is limited.
  • the development provides a stroke limitation for a pneumatic cylinder of the welding head.
  • the exporting force of the spring package can be precisely defined.
  • the stroke limitation solves the problem that in a drive with several pneumatic cylinder packages, which are screwed one above the other, concatenated and connected in series, the lowest cylinder can not drive to the limit due to the tolerances of the cylinder.
  • the welding head is adapted to set a welding force between 500N and 10,000N by equipping with different spring packs.
  • the welding force in this case falls only slightly higher than a bias of the spring assembly, if the spring assembly is only slightly suppressed by the drive of the welding head with a dynamic travel of 1.5mm to 2mmm.
  • the cylinder force of a pneumatic cylinder of the drive should be greater than the maximum bias of the spring pack to overcome this and to be able to overpress the spring pack.
  • the cylinder force is not chosen to be much higher than the maximum bias of the spring pack by reducing a number of cylinder packs connected in series or down-controlling a compressed air of the cylinder. If very different spring assemblies are used, the cylinder force should be above the maximum preload of 10,000 N.
  • a cylinder force of a pneumatic cylinder of a drive of the welding head is not sufficient to overpress a spring assembly with a high pretensioning, then additional cylinder packages can advantageously be screwed as cells over the pneumatic cylinder and connected in series therewith.
  • the spring pack allows this a particularly simple spring change.
  • the spring assembly in this case, if necessary, by a variable bias to a stepless fine adjustment of the welding force.
  • the welding head can be used for welding, in particular resistance welding, resistance pressure welding or resistance spot welding, for soldering, in particular resistance soldering, or for hot riveting. This offers the advantage that the welding head can be used by process substitution as a resource for different technologies.
  • the spring pack is inserted into the frame.
  • Welding head is placed on a workpiece.
  • a welding pressure is repeatedly measured by means of a force sensor which is arranged between the spring assembly and the frame.
  • a preload of the spring pack is adjusted until the measured welding pressure corresponds to a nominal value.
  • Figure 2a is a front view with a section through the
  • FIG. 2b shows a side view of the welding head from FIG. 1,
  • FIG. 3 shows a first detailed view of the welding head from FIG. 1,
  • FIG. 4 shows a second detail view of the welding head from FIG. 1
  • FIG. 5 shows a spring package
  • FIG. 6 shows a welding head with built-in spring package
  • Figure 7 shows the spring assembly of Figure 5 in a detailed
  • FIG. 8 shows the components of the spring package
  • FIG. 9 shows a spring assembly in the installed state in a machine
  • FIG. 10 shows a stroke limitation for a pneumatic cylinder
  • FIG. 11 shows an operating method for a welding head with built-in spring assembly
  • FIG. 12 shows an expansion of the spring assembly from a machine
  • FIG. 13 shows a welding head with water and electrical connection
  • FIG. 14 shows a welding head with electrical insulation
  • FIG. 15 shows an adjusting nut with electrical insulation
  • FIG. 16 shows a welding head with built-in spring assembly.
  • FIG. 1 shows a known from WO 2012045763 AI
  • a sensor 8 a spacer sleeve 21, a piston rod 20 and an electrode guide 31 are shown.
  • Figure 1 shows the assembly of said elements in detail.
  • FIG. 1 shows a force sensor 7, which is arranged between the elastic element 4 and the electrode 3.
  • the force sensor 7 thus lies in the direct flow of force between the drive 2, the elastic element 4 and the electrode 3.
  • a stop pin 72 is connected to a guide shaft 75 of the elastic element 4. It allows in conjunction with an adjusting nut 73 which is fixedly mounted by means of a rotation over O-ring on an extension of the drive 2, a simple installation and removal of the force sensor. 7
  • a second adjusting nut 74 which is mounted on the guide shaft 75, serves to set a bias of the elastic element 4.
  • FIG. 2 a shows a front view of the welding head 1 from FIG. 1 with a section through the welding head 1. Shown again are a drive 2, an electrode 3 and an elastic element 4, which are arranged linearly on a line of action 5. A spacer sleeve 20 and electrode guides 30 are also clearly visible. In addition to a cylinder stroke Z, a spring deflection F and an electrode stroke E, a bias voltage V is also shown in FIG. 2a, around which the elastic element 4 is prestressed. Furthermore, FIG. 2 a shows a force sensor 7 which is arranged between the elastic element 4 and the electrode 3. The force sensor 7 thus lies in the direct flow of force between the drive 2, the elastic element 4 and the electrode 3. A stop pin is connected to a guide shaft 75 of the elastic element 4.
  • FIG. 2b shows the welding head 1 from FIG. 1 in a side view.
  • an elastic element 4 and an electrode 3 which are again arranged linearly in a line of action 5
  • FIG. 2b also shows a spacer sleeve 21, a sensor 8 and a connection for a voltage measuring line 50.
  • the connection serves for a voltage measuring line 50 in this case, a measurement of a voltage drop between the electrodes.
  • the other elements have the same function as described above.
  • FIG. 3 shows a first detailed view of the welding head 1 from FIG. 1.
  • the guide shaft 75 which serves as a guide for the pressure spring
  • the guide shaft 75 which may also be referred to as a guide pin, extends far beyond the compression spring through other components of the welding head 1 such as the adjusting nut 73 shown in Figures 3 and 4, which cooperates with a stop pin 72. This results in that the compression spring can be replaced in practice only with great effort, since many components of the welding head 1 have to be disassembled and disassembled for this purpose.
  • FIG. 5 shows a spring assembly 100 which at least partially replaces the components of the welding head known from the prior art, as shown in FIG. 3 and FIG. 4, and also has distinct advantages. Shown are in addition to a compression spring 104, an insert 102, which is fixed by means of a hex screw 101 and applies a biasing force on the compression spring 104 together with an adjusting nut 120.
  • Compression springs are components which give way under load and return to their original shape after relieving, thus behaving elastically restoring. According to Hooke's law, the restoring force of a compression spring is proportional to a displacement of a point of application of force against a direction of force in which the pressure spring acts.
  • FIG. 6 shows a welding head 1 in which the spring assembly 100 from FIG. 5 is inserted.
  • the spring assembly 100 is here inserted into a frame 180.
  • An electrode 3 and a drive 2 of the welding head 1 are also clearly visible.
  • the spring assembly 100 is additionally compressed by means of a spring-locking screw 130 by pressing a head of a piston rod onto the spring assembly 100. As a result, a defined amount of force is exerted on the head of the piston rod and the spring assembly 100, resulting in a
  • the head of the piston rod also forms a positive connection with the spring assembly 100, which ensures that it does not jump out of the welding head 1.
  • FIG. 7 shows a spring assembly 100 in a detailed representation.
  • a compression spring 104 is limited by an adjusting nut 120 with an internal thread 122 and by an insert 102 in the axial direction.
  • the washer 102 is fastened to a guide pin 110 by means of a hexagon screw 101.
  • the hexagon screw 101 is screwed into an internal thread 111 of the guide pin 110 and presses the pressure spring 104 together via the insert 102. men. This results in a defined bias of the compression spring 104.
  • a protective sleeve 103 is loosely on the adjusting nut 120.
  • the protective sleeve 103 is shorter than the compression spring 104 under maximum force.
  • the outside of the protective sleeve 103 is hardened to avoid material removal by friction with the compression spring 104.
  • the guide pin 110 has on its underside a stop 113 and an external thread 112.
  • the adjusting nut 120 is screwed with its internal thread 122 on the outer stangewinde 112 of the guide pin 112.
  • An overall height 105 of the spring assembly 100 results from the sum of the heights of the adjusting nut 120, the compression spring 104 and the insert 102.
  • the total height 105 corresponds approximately to the length of the guide pin 110th
  • FIG. 8 shows the components of the spring assembly 100 from FIG. 7. Shown in detail are the hexagon screw 101, the washer 102, the protective sleeve 103, the compression spring 104, the guide pin 110 with internal thread 111, external thread 112 and stop 113. Further, the adjusting nut 120 is located.
  • Figure 9 shows a spring package 100 in the installed state in a machine. The spring assembly 100 with its components insert 102, guide pin 110, compression spring 104,
  • Protective sleeve 103 and adjusting nut 120 is first inserted into a frame 180.
  • a force sensor 7 is located between the underside of the spring assembly 100 and the frame 180.
  • the frame 180 is installed, for example, in a welding head or any other machine.
  • a spring locking screw 130 is screwed into the frame 180 until it stops.
  • a head of a piston rod 20 by the Federfeststeil- screw 130 is pressed onto the spring assembly 100, whereby the compression spring 104 is biased by the drawn in Figure 9 Vorspannweg 131 in addition.
  • the spring locking screw 130 has a stop, up to which it can be screwed into the frame 180 with an external thread.
  • the Vorspannweg 131 results from the difference in the length of the external thread of the spring locking screw 130 relative to the thickness of the frame 180. After tightening the spring locking screw 130 forms the spring assembly 100 with the head of the piston rod 20 and the force sensor 7 a positive connection. To connect the spring assembly 100 to the head of the piston rod 20, alternatively or additionally, a positive connection is provided in order to prevent the spring assembly 100 from springing out under high pressure forces.
  • the biasing force of the spring assembly 100 results from an addition of three spring travel:
  • Decisive for an executive force of the compression spring 104 is further a stroke limit of a pneumatic cylinder of the machine, in which the spring assembly 100 used is.
  • the mechanical elements of such a stroke limitation are shown in FIG. Shown is a drive 2, which consists for example of three interlinked pneumatic cylinders as a powerhouse.
  • a piston rod 20 of the drive is provided with a fine thread 146, on which an upper lock nut 143 is screwed to stop with an upper adjusting nut 141.
  • the upper adjusting nut 141 strikes the drive 2 and thus forms a stroke limitation.
  • FIG. 11 shows an operating method for a welding head with built-in spring assembly 100.
  • a frame 180, a force sensor 7 and a piston rod 20 and a spring locking screw 130 cooperate here with the spring assembly 100 as described in FIG.
  • an electrode 3 of the welding head which is fixedly connected to the frame 180, as well as workpieces 6 are shown.
  • FIG. 11 shows the welding head in a first operating state 11, a second operating state 12, a third operating state 13 and a fourth operating state 14.
  • the piston rod 20, the spring assembly 100, the force sensor 7 and the electrode 3 are arranged in a line of action.
  • the welding head is operated with the aim of welding the workpieces 6 together.
  • the piston rod 20 develops its driving force along the vertical over the spring assembly 100, the force sensor 7, the frame 180 and finally the electrode 3 on the workpieces 6.
  • a galvanic coating of the electrode 3 prevents corrosion of the electrode 3 and avoids contact resistance - changes.
  • the force sensor 7 is between the spring assembly 100 and the
  • Frame 180 arranged. It is thus in the direct power flow between the piston rod 20, the spring assembly 100 and the electrode 3.
  • a spacer can be installed, which can be replaced by the force sensor 7 at a later time.
  • a force sensor (also called a force transducer) measures a force that acts on it.
  • a dome-shaped force sensor measures a deformation of its metal body by means of strain gauges whose electrical resistance changes with the deformation.
  • the welding head In the first operating state 11, the welding head is in a basic position. In the following it is assumed that the piston rod 20 is driven by a pneumatic cylinder, which is retracted in the first operating state 11.
  • the drive can also be a powerhouse, which consists of three pneumatic cylinders.
  • the pneumatic cylinder is in this case above the piston rod 20 in the idle state.
  • the welding head or its electrode 3 does not rest on the workpieces 6.
  • spring assembly 100 only a force, which results from the set bias or the three spring paths described in Figure 9 acts.
  • the force sensor 7 and the spring assembly 100 can be removed and replaced, provided that the assembly steps shown in FIG. 12 are carried out.
  • the piston rod 20 In the second operating state 12, the piston rod 20 is fully extended within the scope of the stroke limitation of FIG.
  • the electrode 3 has covered an electrode stroke during the transition from the first operating state 11 to the second operating state 12 and placed on the workpieces 6. Since the electric 3 already rests on the workpieces 6, before the piston rod 20 abuts with its lower adjusting nut 142 against the stop 145 (shown in Figure 10), the spring assembly 100 is compressed in addition to the existing already in the first operating state 11 bias by a spring travel F. , which is drawn in Figure 11.
  • the spring assembly 100 is thus suppressed in the second operating state 12.
  • the electrode 3 now presses with a defined welding force on the workpieces 6.
  • the welding force results from the biasing force, which is composed of the three spring paths described in Figure 9, and the spring travel F.
  • the spring travel F corresponds to the cylinder force, which over the piston rod 20 is applied to the spring assembly 100.
  • Biasing force and cylinder force thus determine the resultant force which is exerted by the spring assembly 100 on the workpieces 6.
  • the exact welding force can be determined in the second operating state 12 and adjusted with the aid of the adjusting nut 120 of the spring assembly 100 shown in the preceding figures.
  • the welding force can be set, for example, between 500 N and 10,000 N, wherein a plurality of spring assemblies with different degrees of compression springs can be provided and optionally used to cover this range of values.
  • the bias of the compression spring is set, for example, between 1.8 and 8.5 mm.
  • the spring travel F is set, for example, between 1 and 3 mm, preferably at 1.5 mm. Depending on the design, other limits and guide values for the welding force, the spring travel F and the preload may result.
  • a Beros 162 shown in FIG. 16
  • the welding process itself takes place between the second operating state 12 and the third operating state 13 and is already completed in the latter. During the welding process, the workpieces heat up and become doughy. In this case, the electrode 3 sinks by a Nachsetzweg N in the workpieces 6 a. This results in a Nachsetzmos of the electrode 3 in the yielding material of the workpieces. 6
  • the compression of the spring assembly 100 decreases from the spring travel F by the Nachsetzweg N. Due to the structure of the welding head repositioning is very fast, and the collapse of the welding force is minimized. With the reduction of the spring travel F has also the
  • the fourth operating state 14 shows the case that the piston rod 20 is fully extended in the context of its stroke limitation, but no workpieces 6 are present, so the electrode 3 is pushed into the void. In this case, therefore, no compression of the spring package 100 takes place about the spring travel F, i. the spring assembly 100 is not acted upon in the fourth operating state 14. This can be detected by the Bero 162 of Figure 16 and is used to control whether workpieces are present for welding. The spring travel F is in this case 0. This can be determined by the Bero 162 of Figure 16, whereupon the welding current is not released.
  • the electrode 3 moves as long as synchronous to the movement of the piston rod 20, as it rests against any workpiece 6. As soon as the electrode 3 abuts against a workpiece 6, it is decoupled from the piston rod 20 and moved relative to the movement of the piston rod 20. This is made possible by the spring assembly 100.
  • FIG. 12 shows a removal of a spring assembly 100 from a machine, for example from the welding head described above.
  • the construction of the elements shown here corresponds to the exemplary embodiments of FIGS. 9 and 11.
  • a spring locking screw 130 is provided which, as in FIG Figure 9 described, with the spring assembly 100 cooperates, solved.
  • this coupling exerts no more power on the spring assembly 100.
  • the force sensor 7 can be pulled out, whereby the spring assembly 100 slips or falls to the bottom of the frame 180.
  • the spring package 100 is removed in a third assembly step 63 itself from the frame 180 and replaced if necessary.
  • FIG. 13 shows a welding head 1 with a power connection 171 and a water connection 172.
  • the connections are located on the rear side of the welding head 1.
  • the water connection 172 serves to water-cool the electrode 3 by means of a cooling-water feed-through.
  • FIG. 14 shows a section of a welding head with a spring assembly 100, a frame 180 and an insulation 150, which, during welding, have a correct current path through
  • FIG. 15 shows a sectional view of an adjusting nut 120 with electrical insulation for use in the spring packs shown in FIG. 5, FIG. 6, FIG. 7, FIG. 9, FIG. 11, FIG. 12, FIG. 14 and FIG.
  • the adjusting nut 120 has a recess in which the lower end of the compression spring can be positioned.
  • the diameter of the recess therefore corresponds to the spring outer diameter 121.
  • the adjusting nut 120 has an internal thread 122nd
  • the adjusting nut 120 For electrical insulation of the spring assembly, the adjusting nut 120 consists of two layers.
  • the outer layer which is shown in FIG. 15 by hatching sloping to the right, consists of a non-conductive plastic. From the same material of the stop 113 shown in Figures 7 and 8 of the guide pin 110 is made. Through all these measures, the current path through the spring assembly and in consequence the piston rod is excluded.
  • FIG. 16 shows a complete welding head 1 which operates with a quickly and easily replaceable spring assembly 100.
  • the upper adjusting nut 141 already shown and explained in FIG. 10, upper lock nut 143, lower adjusting nut 142 and lower lock nut 144 are shown.
  • the spring package 100 is inserted into a frame 180.
  • An adjusting nut of the spring assembly 100 is still accessible even when installed from the outside to adjust the bias.
  • a shim 165 is used in the welding head 1 shown. If necessary, this can be replaced by a force sensor.
  • An electrode 3 of the welding head 1 is held by an electrode holder 166.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Resistance Welding (AREA)
  • Springs (AREA)

Abstract

La tête de soudage présente une position de montage pour recevoir un bloc-ressort fermé intrinsèquement et échangeable, le bloc-ressort étant disposé, en position de montage, entre entraînement et électrode dans le flux de force. La position de montage pour le bloc-ressort offre une grande flexibilité en terme de gamme de forces ressort nécessaires. Ainsi, la tête de soudage peut être transformée de façon simple et rapide pour divers procédés à des fins de substitution de procédé. Il est uniquement nécessaire d'insérer un bloc-ressort adapté respectif dans la position de montage. D'autres étapes de montage telles que le vissage ne sont pas absolument nécessaires. Le bloc-ressort monté dans la tête de soudage présente l'avantage qu'il règle la course de retraitement de la tête de soudage et maintient en même temps la force de soudage quasiment constante sur toute la durée du traitement. Le bloc-ressort permet ainsi un comportement de retraitement optimal et très rapide de l'électrode lors du soudage. La tête de soudage peut par conséquent être employée pour des soudures complexes de métaux non ferreux. La construction compacte permet par ailleurs l'utilisation de la tête de soudage en tant que concept de base dans le cadre d'un concept de plateforme employant cette ressource. Du fait de son électrode mobile, la tête de soudage peut être employée pour divers systèmes à flux de matière tels que des logements de coulisseau, des plateaux tournants ou des porte-pièces.
EP13730559.5A 2012-07-12 2013-06-19 Tête de soudage pour recevoir un bloc-ressort Withdrawn EP2872284A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201210212212 DE102012212212A1 (de) 2012-07-12 2012-07-12 Schweißkopf zur Aufnahme eines Federpakets
PCT/EP2013/062786 WO2014009123A1 (fr) 2012-07-12 2013-06-19 Tête de soudage pour recevoir un bloc-ressort

Publications (1)

Publication Number Publication Date
EP2872284A1 true EP2872284A1 (fr) 2015-05-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13730559.5A Withdrawn EP2872284A1 (fr) 2012-07-12 2013-06-19 Tête de soudage pour recevoir un bloc-ressort

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EP (1) EP2872284A1 (fr)
CN (1) CN104602856A (fr)
DE (1) DE102012212212A1 (fr)
MX (1) MX2015000494A (fr)
WO (1) WO2014009123A1 (fr)

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WO2014009123A1 (fr) 2014-01-16

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