DE102008051289A1 - Pillar welding device for attaching weld parts such as weld nuts and/or weld bolts on a flat component, comprises a stand carrying a first electrode, and a movable frame carrying a second electrode - Google Patents

Abstract

The pillar welding device comprises a stand (5) carrying a first electrode, and a movable frame (8) carrying a second electrode (7), where weld parts such as weld nuts and/or weld bolts are clamped in the area of the second electrode and the movable frame is guidable against a spring force by a drive (11) in an operating position in which the actual welding process is carried out. The stand comprises a magnetically working clamping device (13) for fixing a flat component in a determined position to the weld parts. The clamping device comprises a magnet housing made of non-magnetic material. The pillar welding device comprises a stand (5) carrying a first electrode, and a movable frame (8) carrying a second electrode (7), where weld parts such as weld nuts and/or weld bolts are clamped in the area of the second electrode and the movable frame is guidable against a spring force by a drive (11) in an operating position in which the actual welding process is carried out. The stand comprises a magnetically working clamping device (13) for fixing a flat component in a determined position to the weld parts. The clamping device comprises a magnet housing made of non-magnetic material, a centering pin for centering the component, directed towards outside and reached through a hole in the component, and/or an inboard permanent magnet and/or electromagnet with a magnetic field directed towards outside. The permanent magnet and/or electromagnet is assigned a means for impacting the form of the produced magnetic field. The means is formed through an element, made of ferromagnetic material, arranged in the magnet house and adjoining to component and/or through a further permanent magnet and/or electromagnets, or is formed from ferromagnetic material of a construction steel. The produced magnetic field is influenced in form in such a way that a negative impact of arc self-adjusting during the welding of the weld part with the component is avoided in which the magnetic field is formed outside of the actual welding area. The magnet housing is formed from electrode-copper. The centering pin is formed from the electrode copper or silicon nitride. The permanent magnet is formed from neodymium-iron compound. The permanent magnet or electromagnet is formed as block magnet, ring magnet, bar magnet or as magnet with geometrical form. The component and/or the weld part consist of steel with electric conductive surface coating. The welding part is standard part.

Description

The The invention relates to a resistance pressure welding device according to the combination of features of the claim 1.

Resistance press welders are for a long time in different embodiments known.

So Such resistance press welding processes are based on Connection of electrically conductive metallic materials on the Joule power of one through the junction flowing electric current, in which case the connection partners are heated to melting and after the solidification of in formed the joint formed molten metal a welded joint becomes. By squeezing during or after the flow of current is in the resistance-pressure welding the Supported formation of an intimate connection.

Essentially, such welding devices can comprise a frame bearing a first electrode and a movable frame carrying a second electrode, which in turn can be moved counter to a spring force by means of a drive into an operating position (cf. DE 946 381 B . DE 1 292 995 A ).

The DE 88 13 771 U1 describes, for example, a stud welding apparatus having a housing for automatic processing of welding studs, with a stud holder which holds the stud in its welding position by its elastic restoring force, with a feed channel through which the stud is conveyed into a substantially cylindrical space arranged inside the stud holder , And with a charging device which is movable relative to the welding pin by means of a pneumatically operated piston when it is in the cylindrical space and presses it against the elastic restoring force in the stud holder. Stud welding devices of this type are used, for example, in the automotive industry to weld welding bolts, which accommodate, for example, brake pipe fasteners to the body. There are two fundamentally different welding methods, which differ in how the arc required for welding is produced. The first type of welding is called arc ignition. In this type of welding, the stud welder is first placed on the body with the stud located in the stud holder, and a (possibly less) current is passed through the stud, resulting in a short circuit. Subsequently, the stud welder is moved by a predetermined distance from the body, for which purpose a corresponding distance sensor is present on the stud welder. By this return movement, an arc is generated, which is used for welding. In another method, referred to as tip ignition, the weld stud has a small, body facing tip. The welding stud is placed under full welding current on the body, whereby the tip melts in a very short time due to the high current flowing in it, which then creates the arc necessary for welding between the welding stud and the body. In this method, it is important that the welding stud is moved relatively far from the body before ignition.

According to internal Applicant's art is a resistance pressure welding apparatus of the generic type known which of the definition a welding nut, a welding bolt or Like. On a component, in particular a surface component serves. By means of complex and costly pneumatic Clamping technology is the component in a defined welding position held.

task The invention is a resistance press welding device which, in turn, is more cost effective in terms of the state of the art and has easier-to-use clamping technique and a defined fixation of the component, in particular surface component, guaranteed in the welding position.

Solved the object is achieved by a resistance-pressure welding device, in particular stator welding device, for fixing a welding part, such as a welding nut, a welding bolt or the like., On a component, in particular Surface component, with a first electrode supporting Frame and a second electrode carrying movable frame, wherein the welding part in the region of the second electrode is clamped, wherein the movable frame including the second electrode and clamped thereto welding part against a spring force by means of a drive in an operating position is movable, in which the actual welding process can be accomplished and wherein said rack is a magnetically acting jig for fixing the component in a certain position to the welding part having.

By this measure, a comfortable fixation of the component, in particular surface component, created in the desired welding position to the welding part with the simplest means, during the actual welding process, the worker acts only supportive by this while holding the component and with a foot movement, the delivery of the second electrode including welding part causes, but the component is fixed by means of the magnetically acting jig exactly to accomplish a quality welding process.

The Subclaims describe preferred developments or Embodiments of the invention.

After that For example, the magnetically acting jig may be a magnet housing made of a non-magnetic material, an outward-facing and through a bore at least in the component extending centering mandrel for centering the component and at least one inner permanent magnet and / or electromagnets with an outward-facing Have magnetic field. Advantageously, the at least one permanent magnet or electromagnet means for influencing the shape of the generated Magnetic field associated. As a means of influencing the shape of the generated magnetic field can be found in the magnet housing and adjacent to the component disposed element of a ferromagnetic Material and / or another permanent magnet and / or electromagnet at. The element of ferromagnetic material may be advantageous be formed from a known structural steel. Further advantageous is the generated magnetic field in this way influenced in its shape, that an impairment of during welding the welding part with the component adjusting arc avoided is by the magnetic field outside the actual welding area is trained. Conveniently, the magnet housing formed from a per se known electrode copper. The centering pin may in turn also from an electrode copper or from a known heat and wear resistant Ceramics, such as silicon nitride, be formed. What the one used As far as permanent magnets are concerned, this may advantageously be made of a metal the "rare earth", preferably from an im Regard to other possible magnetic materials relatively inexpensive Neodymium-iron compound can be formed, which has particularly high magnetic forces allowed. Further advantageous may be the permanent magnet or electromagnet as a block magnet, ring magnet, bar magnet or as a magnet with another known geometric shape or a combination be formed of such geometric shapes.

means said resistance pressure welding device is allowed a component made of steel and a welded part made of steel or to weld a non-ferrous metal together, wherein Furthermore, a component and / or a welded part made of steel also with an electrically conductive surface coating, such as a galvanizing, can be provided. Particularly advantageous is such a resistance-pressure welding device for the welding of standard parts, namely said Weld nuts, weld studs or the like., On.

The Invention will now be described schematically with reference to the drawings illustrated embodiment explained in more detail. Show it:

1 very schematically a inventively designed resistance pressure welding device in a side view,

2 the detail "Z" after 1 in particular the representation of a magnetically acting clamping device according to a first advantageous embodiment during the intended use of the resistance-pressure welding device, and

3 the representation of a further advantageous embodiment of a magnetically acting jig.

1 shows a resistance pressure welding device 1 establishing a known and in 2 shown welding part 2 in the form of a welding nut, which may be a standard part, on a component 3 , For example, on a reinforcing plate of a motor vehicle tailgate.

Said resistance pressure welding device 1 in the present case essentially consists of a first electrode 4 carrying frame 5 with shooting table 6 which in turn is the first electrode here 4 and a second electrode 7 carrying mobile frame 8th in the manner of a linear slide with electrical connection cable and welding part feed 9 , in this case welding nut feeder, together.

The movable frame 8th is complete with the second electrode 7 from a first operating position, which corresponds to a starting position, vertically against one of a compression spring 10 applied spring force by means of a drive 11 , which in turn is in this case formed or activated by a Fußhebelbetätigung to the shooting table 6 towards a second operating position movable in which the actual welding process is accomplished. When the welding process is complete, the frame becomes 8th due to the spring force acting automatically returned to its original position.

Next has the resistance-pressure welding device 1 via a known trip contact 12 with stop, which allows in particular the defined electric power supply.

As in 2 shown in detail in detail, ver adds the resistance press welding device 1 or the shooting table 6 of the frame 5 the resistance-pressure welding device 1 via a magnetically acting clamping device 13 for fixing the component 3 in a certain position. The welding part 2 , in this case the welding nut, is in the region of the second electrode 7 or clamped to the same in a known and thus not shown manner and fixed.

The magnetically acting clamping device 13 is essentially a magnet housing 14 formed of a non-magnetic material, preferably of a known heat-resistant electrode-copper and has an outward and through a prepared hole 15 in the shooting table 6 and in the component 3 passing centering pin 16 for receiving and centering the component 3 on.

What the centering pin 16 As far as the same can likewise be formed from an electrode copper or from a known heat and wear resistant ceramic, for example from a silicon nitrite.

In the present case is inside the magnet housing 14 a permanent magnet 17 in the form of a block magnet with an outward magnetic field 18 arranged, which in turn is suitable, the component 3 to keep in a predetermined welding position.

In contrast, a known per se electromagnet can be used, whose performance is adjustable within wide limits. It may also be indicated, and is accordingly also covered by the invention, one or more permanent magnets 17 to combine with one or more electromagnets, whereby a defined adjustment of the required magnetic forces, for example, is permitted such that the permanent magnet 17 first serves the coarse fixing and only during the actual welding process said electromagnet is activated and provides additional magnetic forces (not shown in detail). In this case, for example, the power supply for the electromagnet with the power supply for the welding process can be regularly or control technology coupled by the electromagnet is switched off immediately upon completion of the welding process or delayed.

In the context of experiments, it has proved to be expedient, the at least one permanent magnet 17 and / or electromagnet means 19 for influencing the shape of the generated magnetic field 18 or assign its magnetic field lines. Said means 19 is suitably by a magnet housing 14 and adjacent to the component 3 arranged element of a ferromagnetic material, such as a conventional structural steel, formed.

According to this embodiment, the element of ferromagnetic material is formed as a perforated disc, which in turn in the magnet housing 14 above the permanent magnet 17 and accordingly adjacent to the surface component 3 is arranged.

The generated magnetic field 18 is thus influenced in its shape such that an impairment of the during welding of the welding part 2 respectively the welding nut with the surface component 3 adjusting, not shown here arc is avoided by the magnetic field 18 is formed outside of the actual welding area.

As the 2 is further, is in the immediate welding area between the magnet housing 14 and the component 3 a perforated insulating disc 20 arranged, in turn, any adverse increased heat input into the jig 13 During the welding process advantageously obstructed and avoids a malfunction, the resistance-pressure welding device should accidentally without component 3 be operated.

Will as in this case a permanent magnet 17 For example, favors in isolation, it makes sense to form the same from a metal of the "rare earths", for example, a neodymium-iron compound, which, as already demonstrated above, allows particularly high magnetic forces.

The embodiment according to 3 differs from the above essentially by the fact that for forming the magnetically acting jig 13 instead of a block magnet, a permanent magnet 17 or electromagnet in the form of a ring magnet is used. Certainly also bar magnets or magnets with other known geometric shapes or a combination of such geometric shapes are conceivable and accordingly by the invention with detected (not shown). Furthermore, the jig 13 instead of below the shooting table 6 now arranged above it.

Furthermore, the permanent magnet 17 and / or electromagnets also a means 19 for influencing the shape of the generated magnetic field 18 or whose magnetic field lines assigned, which, however, present in the manner of a concentric with the ring magnet arranged further ring magnet, such as a permanent and / or electromagnet, or as a concentrically arranged ring or Partial ring-shaped element made of ferromagnetic material, such as mild steel, is formed.

In the context of experiments, it has also proved to be useful, the centering mandrel 16 form axially adjustable, which is allowed that this next to the component 3 also the welding part 2 , in the present case in the form of a weld nut, fixed or centered. In this respect, in the present case, a corresponding adjusting screw 21 provided, in turn, within an insulating threaded bushing 22 of the shooting table 6 is guided, to which a further Isolierbuchse 23 axially connected.

Finally, here is in the immediate welding area between the magnet housing 14 and the component 3 a perforated insulating disc 20 arranged, in turn, any adverse increased heat input into the jig 13 During the welding process advantageously obstructed and avoids a malfunction, the resistance-pressure welding device should accidentally without component 3 be operated.

As already stated above, it is allowed by means of the inventively equipped resistance pressure welding device, a component 3 made of steel and a welded part 2 of steel or a non-ferrous metal to be welded together, further comprising a component 3 and / or a welded part 2 made of steel can also be provided with an electrically conductive surface coating, not shown, such as a galvanizing. Such a resistance-pressure welding device is particularly advantageous for welding standard welded parts 2 , namely said welding nuts, welding bolts or the like.

1

Resistance pressure welding device

2

weldment (Welding nut, welding stud or the like)

3

component

4

first electrode

5

frame

6

Shooting table (easel 5 )

7

second electrode

8th

frame

9

Weldment feed

10

compression spring

11

drive

12

release contact

13

jig

14

magnet housing

15

drilling

16

centering

17

permanent magnet

18

magnetic field

19

Means for influencing the shape of the generated magnetic field 18

20

insulating

21

adjustment

22

threaded bushing

23

insulating bush

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 946381 B [0004]
• - DE 1292995 A [0004]
• - DE 8813771 U1 [0005]

Claims (14)

Resistance pressure welding device ( 1 ), in particular stator welding device, for fixing a welded part ( 2 ), such as a weld nut, a weld stud or the like., On a component ( 3 ), in particular surface component, with a first electrode ( 4 ) carrying frame ( 5 ) and a second electrode ( 7 ) carrying movable frame ( 8th ), wherein the welded part ( 2 ) in the region of the second electrode ( 7 ), the movable frame ( 8th ) together with the second electrode ( 7 ) and clamped thereto welding part ( 2 ) against a spring force by means of a drive ( 11 ) is movable in an operating position in which the actual welding operation can be accomplished, and wherein said frame ( 5 ) a magnetically acting clamping device ( 13 ) for fixing the component ( 3 ) in a certain position to the welding part ( 2 ) having. Resistance pressure welding device ( 1 ) according to claim 1, characterized in that the magnetically acting clamping device ( 13 ) a magnet housing ( 14 ) of a non-magnetic material, an outward and through a bore ( 15 ) at least in the component ( 3 ) passing through centering pin ( 16 ) for centering the component ( 3 ) and at least one inner permanent magnet ( 17 ) and / or electromagnets with an outwardly directed magnetic field ( 18 ) having. Resistance pressure welding device ( 1 ) according to claim 2, characterized in that the at least one permanent magnet ( 17 ) and / or electromagnets a means ( 19 ) for influencing the shape of the generated magnetic field ( 18 ) assigned. Resistance pressure welding device ( 1 ) according to claim 3, characterized in that the means ( 19 ) for influencing the shape of the generated magnetic field ( 18 ) by a in the magnet housing ( 14 ) and adjacent to the component ( 3 ) arranged element made of a ferromagnetic material and / or by a further permanent magnet ( 17 ) and / or electromagnet is formed. Resistance pressure welding device ( 1 ) according to claim 4, characterized in that the means ( 19 ) for influencing the shape of the generated magnetic field ( 18 ) is formed of ferromagnetic material of a known structural steel. Resistance pressure welding device ( 1 ) according to one of claims 2 to 5, characterized in that the generated magnetic field ( 18 ) is influenced in its shape such that a deterioration of the during welding of the welding part ( 2 ) with the component ( 3 ) is avoided by adjusting the magnetic field ( 18 ) is formed outside of the actual welding area. Resistance pressure welding device ( 1 ) according to one of claims 2 to 6, characterized in that the magnet housing ( 14 ) is formed from a per se known electrode copper. Resistance pressure welding device ( 1 ) according to one of claims 2 to 7, characterized in that the centering mandrel ( 16 ) is formed from a per se known electrode copper or a known wear-resistant ceramic, such as silicon nitrite. Resistance pressure welding device ( 1 ) according to one of claims 2 to 8, characterized in that the permanent magnet ( 17 ) is made of a metal of the "rare earths". Resistance pressure welding device ( 1 ) according to claim 9, characterized in that the permanent magnet ( 17 ) is formed of a neodymium-iron compound. Resistance pressure welding device ( 1 ) according to one of claims 2 to 10, characterized in that the permanent magnet ( 17 ) or electromagnet is formed as a block magnet, ring magnet, bar magnet or magnet with other known per se geometric shape or a combination of such geometric shapes. Resistance pressure welding device ( 1 ) according to one of claims 1 to 11, characterized in that the component ( 3 ) made of steel and the welded part ( 2 ) made of steel or a non-ferrous metal. Resistance pressure welding device ( 1 ) according to claim 12, characterized in that the component ( 3 ) and / or the welding part ( 2 ) are made of steel with an electrically conductive surface coating. Resistance pressure welding device ( 1 ) according to one of claims 1 to 13, characterized in that the welding part ( 2 ) is a standard part.