DE102012110098B4 - Process for the production of electrical feedthroughs - Google Patents

Abstract

Method for producing an electrical bushing (200,310,320,330,340) for the power supply of the electric exhaust gas heater of a motor vehicle, the bushing having an outer tube (230,313,323, 333,343) which has an interior space and an electrical conductor (210,311,321) penetrating the interior space of the outer tube (230,313,323,333, 343) , 421), the ends of which protrude beyond the outer tube (230,313,323,333, 343) on at least one of the end faces (231,232,314, 315,324,325,334,335,344,345) of the outer tube (230,313, 323,333,343), the electrical conductor (210,311,321,421) of one in the interior of the outer tube (230,343,323,343) Insulating material (120,220,342) is surrounded and the entire arrangement of the outer tube (230,313,323,333,343), electrical conductor (210,311,321,421) and insulating material (220,342) is compressed, with the steps of a) providing the outer tube (230,313,323,333,343) with the interior that is supported by the electrical conductor (210,311,321,421 ) is interspersed with the inside space of the outer tube (230,313,323,333,343) is surrounded by the insulating material (120,220,342), in the form of a compressed rod material (290), b) removal of the outer tube (230,313,323,333,343) at sections of the rod material which are separated from each other by a length that corresponds to the desired length of the outer tube ( 230,313, 323,333,343) corresponds to the bushing (200,310, 320,330,340) to be produced, are spaced apart, the length of the sections on which the outer tube (230,313, 323,333,343) is removed, the respectively desired protrusion of the electrical conductor (210,311,321,421) relative to the end face (231,232,34414,315,335,325,325 ) corresponds to, c) removing the insulating material at (220,342) sections of the rod material (290) which are spaced apart from one another by a length which corresponds to the desired length of the outer tube (230,313, 323,333,343) of the bushing (200,310, 320,330,340) to be produced, wherein the length of the sections on which the insulating material (220,342) was removed corresponds to the respectively desired overhang (d1, d2) of the electrical conductor (210,311,321,421) relative to the end face (231, 232,314,315, 324,325,334, 335,344,345), and d) cutting off a section of the rod material (290), the length of which corresponds to the desired length (L) of the electrical conductor (210,311,321,421) corresponds to the implementation to be produced (200,310,320,330,340).

Description

Electrical feedthroughs are required in particular when an electrical conductor is to be passed through an electrically conductive material without electrical contact being established between the electrical conductor and the electrically conductive material. As a rule, they have an electrical conductor, an insulating material that has an electrically insulating effect and a jacket via which the connection to the electrically conductive material through which the conductor is to be passed can be established.

There are a number of applications, for example in the automotive industry, in which such bushings are exposed to very high loads. If we consider an electrical exhaust gas heater for a catalytic converter for a motor vehicle as an example, the power supply for the exhaust gas heater must be insulated and passed through the wall of the pipe in which the exhaust gas flows.

Such a catalytic converter heater is often insulated from the exhaust pipe and suspended in it, which is done partly via insulating pins inside the exhaust pipe, but at least partly also by establishing a mechanical connection of the conductor of the electrical feedthrough protruding into the pipe interior, in particular by welding or soldering.

In addition, the electrical conductor of the bushing often has a thread on its connection side for producing an electrical screw connection. When tightening and loosening this connection, considerable torsional forces act in addition to pressure and tension.

In this application, the electrical feedthrough must therefore be able to withstand a high temperature load on the one hand over the long term and on the other hand also a high vibration load. It is therefore very important that the electrical feedthrough has a high tensile strength and a high resistance to torsion.

To manufacture such electrical feedthroughs, it is known from the prior art to provide the electrical conductor, which can consist of NiCr8020, for example, as a half-part brought into the desired shape by turning, milling and / or thread rolling, followed by an insulating tube, which is typically made of a ceramic insulating material, in particular consisting of a porous MgO body made of, for example, C820, and then accommodating this arrangement in the interior of an outer tube, which can consist, for example, of stainless steel. After this arrangement has been put together from the electrical conductor, insulating tube and outer tube, it is compressed, in particular pressed, so that the cross-section is reduced, so that the electrical leadthrough is created.

Practice shows that this type of production of electrical feedthroughs brings with it a number of problems, although it is associated with quite a high level of effort, since each electrical feedthrough has to be assembled and compacted individually. The degree of compression that is achieved varies in such a way that it decreases in the direction of the ends of the outer tube of the electrical feedthrough. As a result, these areas only have a small stabilizing effect against mechanical stress, in particular in the form of tension, torsion or vibration.

This is particularly of high relevance because the length of the outer tube is often very short due to structural requirements with regard to the installation space requirements.

In addition, the insulating material breaks out on the end faces of the pressed insulating tube. This further reduces the area between the conductor and the insulating material, as well as the insulating material and the outer tube, so that the bushing is even less resistant to pressure, tension and torsion.

These problems can be mitigated, but not completely avoided, if silicone disks, rubber hoses or similar parts are placed on the end faces during pressing. These generate a certain axial counterpressure during compression, which increases compression in the edge area and reduces the breaking out of the insulating material.

However, there are also problems with regard to the precision of the geometry of the electrical conductor of the bushing that can be reliably achieved with this manufacturing method. In many practical applications, not just a wire is used as the electrical conductor of the bushing, but rather a connection bolt is required that has a certain connection geometry on one or both sides of the electrical bushing, for example a predetermined length with small spacing tolerances by which the electrical conductors must protrude beyond the end faces of the outer tube and insulating material and / or a predetermined shape in order to provide a contact to an electrical connection, for example a thread.

Problems in connection with the predetermined shape of the electrical connection arise in production according to the prior art, in particular because the turning of the conductor material, which is often very soft, is a difficult process.

The pressing process step in particular causes problems in maintaining spacing tolerances. During this process, the material is elongated, which can lead to the distance tolerances not being reliably achieved, so that a considerable proportion of rejects is produced.

From US 2009/0 032 283 A1 a method for producing a bushing for electrical current through a grounded surface is known which has an essentially rotationally symmetrical insulating body which surrounds a central electrical conductor and which has a seal through which gases can pass and prevents liquids between the insulating body and the central electrical conductor.

The object of the invention is therefore to develop an improved method for producing electrical bushings for the power supply of the electrical exhaust gas heater of a motor vehicle. This object is achieved by a method with the features of claim 1. Advantageous embodiments of the method are the subject of the subclaims.

1. a) Bereitstellen eines Außenrohrs, dessen Innenraum von einem elektrischen Leiter durchsetzt wird, der im Innenraum des Außenrohres von einem Isolierstoff umgeben ist, in Form eines verdichteten Stangenmaterials. Ein derart aufgebautes „verdichtetes Stangenmaterial“ besteht aus im Vergleich zur Länge einer elektrischen Durchführung langen Abschnitten von Außenrohr, Isolierstoff, insbesondere in Form eines Isolierstoffrohrs und elektrischem Leiter, welche auf die vorstehend beschriebene Weise relativ zueinander angeordnet und verdichtet sind. Eine solche Verdichtung kann einerseits dadurch erfolgen, dass die einzelnen Komponenten miteinander verpresst sind, andererseits kann ein solcher Verdichtungseffekt aber auch z.B. durch Walzen, Hämmern oder Ziehen aus einem größeren Querschnitt erreicht werden.
2. b) Entfernen des Außenrohrs an Abschnitten des Stangenmaterials, die voneinander um eine Länge, die der gewünschten Länge des Außenrohrs der herzustellenden Durchführung entspricht, beabstandet sind, wobei die Länge der Abschnitte, auf denen das Außenrohr entfernt wird, dem jeweils gewünschten Überstand des elektrischen Leiters relativ zur Stirnfläche entspricht,
3. c) Entfernen des Isolierstoffs an Abschnitten des Stangenmaterials, die voneinander um eine Länge, die der gewünschten Länge des Außenrohrs der herzustellenden Durchführung entspricht, beabstandet sind, wobei die Länge der Abschnitte, auf denen der Isolierstoff entfernt wird, dem jeweils gewünschten Überstand des elektrischen Leiters relativ zur Stirnfläche entspricht, und
4. d) Abtrennen eines Abschnitts des Stangenmaterials, dessen Länge der gewünschten Länge des elektrischen Leiters der herzustellenden Durchführung entspricht.

The inventive method for producing an electrical bushing for the power supply of the electrical exhaust gas heater of a motor vehicle with an outer tube, and an electrical conductor penetrating the interior of the outer tube, the ends of which protrude at least one of the end faces of the outer tube, the electrical conductor in the interior of the Outer pipe is surrounded by an insulating material and the entire arrangement of outer pipe, electrical conductor and insulating material is compressed has the following steps:

1. a) Providing an outer tube, the interior of which is penetrated by an electrical conductor, which is surrounded by an insulating material in the interior of the outer tube, in the form of a compressed rod material. A “compacted rod material” constructed in this way consists of long sections of outer tube, insulating material, in particular in the form of an insulating material tube and electrical conductor, which are arranged and compressed relative to one another in the manner described above compared to the length of an electrical feedthrough. Such a compression can take place on the one hand in that the individual components are pressed together, on the other hand such a compression effect can also be achieved, for example, by rolling, hammering or pulling from a larger cross section.
2. b) Removal of the outer tube at sections of the rod material which are spaced from one another by a length which corresponds to the desired length of the outer tube of the bushing to be produced, the length of the sections on which the outer tube is removed being the respectively desired protrusion of the electrical conductor corresponds to the face,
3. c) Removing the insulating material at sections of the rod material which are spaced apart from one another by a length which corresponds to the desired length of the outer tube of the bushing to be produced, the length of the sections on which the insulating material is removed being the respectively desired protrusion of the electrical conductor corresponds to the face, and
4. d) cutting off a section of the rod material, the length of which corresponds to the desired length of the electrical conductor of the bushing to be produced.

It is essential that the steps of the method, with the exception of step a), which is always carried out first, can be carried out in different sequences. For example, it is possible to first cut off a section from the bar stock provided in step a) in accordance with step d) and then to process it in accordance with steps b) and c). However, step d) can also be the last step and can be carried out by severing the last layer of rod material, i.e. the electrical conductor, that remains after steps b) and c) have been completed.

It is also possible to carry out step c) before step b), e.g. by bringing a tool into contact with the insulating material from the end face of the bar material and virtually scraping it out of the space between the outer tube and the electrical conductor.

It is also not absolutely necessary that the processing steps according to b) and c) are each completely processed before moving on to the next step. It is therefore by no means necessary to first completely remove the outer tube on a desired section and then completely remove the insulating material on the desired section. Rather, it is possible and at least expedient if the respective removal of the outer tube and insulating material can be carried out with the same tool and / or by machining under similar conditions such as speed, contact pressure on the material or the like, initially on one of the widths of a tool used, first of all to remove the outer tube and the insulating material and, if necessary, even to remove the electrical conductor, for example, of the desired section to shape machining and to repeat these steps on the next section in each case until steps b) and c) have been completely processed.

Even further, it is also possible that steps b) and c) are carried out simultaneously, i.e. that the outer tube and insulating material are removed at the same time by the tool of the lathe in one go.

Already at this point it is explicitly pointed out that when a “further processing step” is mentioned in the following, this can be carried out in whole or in part at different points in time in the process and in particular can be carried out in several subsections in the manner described above .

A significant part of the advantages of the method according to the invention results from the transition to no longer assembling the electrical feedthrough in a modular fashion from individual parts, but instead quasi "from the solid" or more precisely formulated from a compacted composite made of an outer tube provided as rod material , the interior of which is penetrated by an electrical conductor which is surrounded by an insulating material in the interior of the outer tube. “As rod material” means that the material is provided in a length that by far exceeds the length of the electrical feedthroughs to be produced, so that a large number of electrical feedthroughs can be produced from one rod of the material. On the one hand, compression can be achieved by pressing the individual components together, on the other hand, it can also be achieved, for example, by rolling, hammering or pulling from a larger cross-section.

• Erstens wirken sich bei der Verdichtung des Stangenmaterials dessen Endabschnitte, die zu einer ungleichmäßigen und insbesondere geringeren Verdichtung führen, kaum aus. Das bedeutet, dass die daraus hergestellten elektrischen Durchführungen -in ganz besonderem Maße dann, wenn die Endabschnitte des Stangenmaterials optional bei Verwendung einer neuen Stange jeweils abgetrennt werden- über ihre Länge hinweg gleichmäßiger, insbesondere auch gleichmäßig stärker verdichtet sind als bisher und Probleme mehr mit ausbrechendem Isolierstoff an den Enden werden effektiv vermieden.

It has been shown that this approach has several advantages:

• Firstly, when the rod material is compressed, its end sections, which lead to uneven and, in particular, less compression, have hardly any effect. This means that the electrical feedthroughs made therefrom - especially when the end sections of the rod material are optionally separated when using a new rod - are more evenly compressed over their length, in particular even more evenly more than before, and more problems with erupting Insulating material at the ends is effectively avoided.

This leads to an improvement in the resistance of the electrical bushing produced in this way to mechanical stress, in particular in the form of tension, torsion or vibration, even if the same pressure is nominally used during pressing as in the production processes known up to now.

This effect is increased by the fact that up to now the pressure that can be used for pressing was limited by the fact that elongation of the material during pressing had to be avoided so that the dimensions of the bushing and the electrical conductor were within the required tolerances. However, since in the method according to the invention the shapes subject to these tolerances are only worked out of the material after pressing, the new method can also be used with significantly higher pressure.

The method according to the invention also has a further significant advantage. If, in fact, relatively soft materials are used for the electrical conductor of the bushing, the machining of these conductors to provide suitable connection contours, for example a connection thread, is relatively difficult to carry out, since the materials can deform during processing. For this reason, turning or milling cannot be carried out very efficiently with very soft material, since only a little can be infeed with one pull and must be moved with a slow advance. This problem becomes more severe the longer the electrical conductors required for the implementation.

Since, according to the invention, the connection sections of the electrical conductor are only shaped in the pressed state, the resulting embedding in the insulating material and outer tube increases the rigidity and strength of the object to be machined, which makes machining easier.

Further advantages in terms of manufacturing technology are that the process can be automated to a high degree, and the electrical feedthroughs can be produced in a freely falling manner on an automatic lathe. In addition, electrical bushings of the most varied lengths and with completely different contours of the electrical conductors can be manufactured from the same rod material, which leads to advantages in terms of storage.

Surprisingly, it is also shown that this production method, which at first glance appears to be significantly less efficient in terms of material consumption - ultimately only significant proportions of the insulating material used and the outer pipe used provided in order to be machined again - this material loss due to the much lower proportion of rejects that do not meet the specifications, can partially compensate, completely compensate or even overcompensate depending on the individual case.

In a particularly preferred embodiment of the method, in a further processing step, the ends of the electrical conductor penetrating the interior of the outer tube projecting beyond the end faces of the outer tube are brought into a desired shape. In particular, this can be done completely or partially by machining, e.g. by turning or milling.

Another advantageous development of the method consists in modifying the surface of the outer tube of the bushing in a further processing step. As a result, electrical feedthroughs can also be manufactured without a great deal of additional effort, which easily meet very small outside diameter tolerances and / or whose surface quality is optimized.

• 1a: ein erstes Stadium der Herstellung einer elektrischen Durchführung gemäß dem Stand der Technik,
• 1b: ein zweites Stadium der Herstellung einer elektrischen Durchführung gemäß dem Stand der Technik als Querschnittsdarstellung längs zur Erstreckungsrichtung der elektrischen Durchführung,
• 1c: eine Ausschnittsvergrößerung aus der Darstellung gemäß 1b,
• 1d: ein drittes Stadium der Herstellung einer elektrischen Durchführung gemäß dem Stand der Technik,
• 1e: die nach dem Verfahren gemäß dem Stand der Technik hergestellte Durchführung als Querschnittsdarstellung längs zur Erstreckungsrichtung der elektrischen Durchführung, und
• 1f: eine Ausschnittsvergrößerung aus der Darstellung gemäß 1e.
• 2a: ein erstes Stadium der Herstellung einer elektrischen Durchführung gemäß dem erfindungsgemäßen Verfahren,
• 2b: ein zweites Stadium der Herstellung einer elektrischen Durchführung gemäß dem erfindungsgemäßen Verfahren,
• 2c: ein drittes Stadium der Herstellung einer elektrischen Durchführung gemäß dem erfindungsgemäßen Verfahren,
• 2d: ein viertes Stadium der Herstellung einer elektrischen Durchführung gemäß dem erfindungsgemäßen Verfahren,
• 2e: ein fünftes Stadium der Herstellung einer elektrischen Durchführung gemäß dem erfindungsgemäßen Verfahren.
• 3a: eine erste Ausführungsform einer mit dem erfindungsgemäßen Verfahren herstellbaren elektrischen Durchführung,
• 3b: eine zweite Ausführungsform einer mit dem erfindungsgemäßen Verfahren herstellbaren elektrischen Durchführung,
• 3c: eine dritte Ausführungsform einer mit dem erfindungsgemäßen Verfahren herstellbaren elektrischen Durchführung, und
• 3d: eine vierte Ausführungsform einer mit dem erfindungsgemäßen Verfahren herstellbaren elektrischen Durchführung in einer teilweise geöffneten Darstellung.

The invention is explained in more detail below with reference to drawings. Show it:

• 1a : a first stage in the manufacture of an electrical bushing according to the prior art,
• 1b : a second stage of the production of an electrical bushing according to the prior art as a cross-sectional view along the direction of extension of the electrical bushing,
• 1c : an enlarged section from the illustration according to 1b ,
• 1d : a third stage of the manufacture of an electrical bushing according to the prior art,
• 1e : the bushing produced by the method according to the prior art as a cross-sectional view along the direction of extension of the electrical bushing, and
• 1f : an enlarged section from the illustration according to 1e .
• 2a : a first stage of the production of an electrical bushing according to the method according to the invention,
• 2 B : a second stage of the production of an electrical bushing according to the method according to the invention,
• 2c : a third stage of the production of an electrical bushing according to the method according to the invention,
• 2d : a fourth stage of the production of an electrical bushing according to the method according to the invention,
• 2e : a fifth stage of the production of an electrical bushing according to the method according to the invention.
• 3a : a first embodiment of an electrical bushing that can be produced using the method according to the invention,
• 3b : a second embodiment of an electrical bushing that can be produced using the method according to the invention,
• 3c : a third embodiment of an electrical bushing that can be produced using the method according to the invention, and
• 3d : a fourth embodiment of an electrical feedthrough which can be produced with the method according to the invention in a partially opened representation.

The same reference symbols are used in different figures for the same components of the same embodiments, unless otherwise indicated.

First of all, based on the 1a to 1f briefly the manufacturing method known from the prior art for an electrical bushing 100 explained. As in 1a shown are an electrical conductor 110 , for example in the form of a connecting bolt of the desired length L. with connection sections 111 and 112 worked into it by machining, a tube made of insulating material 120 and an outer tube 130 provided.

Then the pipe is made of insulating material 120 over the electrical conductor 110 pushed and on this arrangement the outer tube 130 positioned so that the in 1b The arrangement shown arises in which between the individual components, as particularly well in the enlarged section according to 1c can still be seen gaps 141 , 142 are present. Exact positioning is important when sliding on, since the distances d1 and d2 represent the length of the electrical conductor on the respective sides of the electrical bushing 100 over the end faces of the insulating material 121 , 122 or the end faces of the outer tube 131 , 132 survives, define, may only have small tolerances in many applications.

As in 1d is shown schematically, the structure is next joined together by radial pressing, so that electrical conductors 110 , Pipe made of insulating material 120 and outer tube 130 be squeezed together and the in 1e electrical feedthrough shown 100 arises in which the electrical implementation 100 enforcing electrical conductors 110 in the interior of the outer tube 130 with insulating material 120 is surrounded. In 1e the problems that occur are exaggerated: the pressing results in a poorly controllable and poorly reproducible elongation of the electrical conductor 110 so that it now has a length L ', which means that there are also distances d1', d2 'instead of the required distances d1, d2. In addition, as in 1f can be seen particularly clearly, a breakout of the insulating material 120 at its end faces 121 , 122 .

The sequence of the 2a to 2e illustrates by way of example the procedure according to the invention for producing an electrical bushing 200 . 2a shows the bar material used 290 with outer tube 230 , in the interior of the outer tube 230 arranged electrical conductor 210 and the tube made of insulating material surrounding the electrical conductor 220 , in particular here the entire remaining volume of the interior space that is not covered by the electrical conductor 210 is occupied, fills. There are electrical conductors 210 , Pipe made of insulating material 220 and outer tube 230 compacted together under high pressure, resulting in an arrangement that is highly resistant to tension, torsion and vibration.

From the bar material 290 is used in the subsequent manufacturing steps with the tool 295 a lathe, not shown, by machining the electrical implementation 200 generated. 2 B shows how to use the tool 295 on a section of the bar stock 290 the outer tube 230 was removed, which in the example shown in one go together with the removal of the insulating material 220 at this point and part of the shape of the electrical conductor 210 in its end section 211 is done. Steps b) and c) are therefore simultaneous and also together with part of the shaping of the end face 231 of the outer tube 230 protruding ends of the interior of the outer tube 230 penetrating electrical conductor 210 is made into a desired shape.

As in 2c is shown, a thread can now optionally be rolled in with another tool 296.

In 2d is a half-finished implementation 200 shown with a chisel 297 from bar stock 290 was stabbed. In the following, as in 2e is shown, the unprocessed side of the electrical bushing 200 with the tool 295 worked out from the solid, so that the second end 212 of the electrical conductor 210 the electrical feedthrough 200 is exposed and brought into the desired geometric shape by machining, which again in one go for the outer tube 230 , Insulating material 220 and electrical conductors 210 can happen.

Of course, the machining of the second end can also be done with the use of a corresponding lathe 212 can be carried out without prior parting.
Then it is done by severing the electrical conductor 210 at the desired distance from the right face 232 of the outer tube 230 the electrical feedthrough 200 from bar stock 290 severed.

It should be emphasized again at this point that the “layer-by-layer” removal of the entire sections of the outer pipe to be removed in each case 230 , Insulating material 220 and individual areas of the electrical conductor 210 as it was illustrated with reference to the sequence of figures 2a to 2e, is by no means mandatory. The invention can be implemented in the same way by bringing the tool to a given point and then sequentially modifying all layers at this point before moving the tool a little further and then making all the necessary modifications at this point. In particular, the removal of several layers up to and including machining of the electrical conductor can in practice take place in one go if the tool of the lathe can be advanced so far that all these layers are removed at the same time.

It is only essential that the leadthrough is worked out of the bar material instead of, as before, being assembled from individual components and compacted.

Based on 3a to 3d it should be made clear how high the flexibility of the manufacturing process according to the invention is with extremely low storage requirements. These figures show electrical bushings 310, 320, 330, 340, each of which consists of an electrical conductor 311, 321, 331, 341, one only in the open section of the 3d recognizable, the electrical conductor 311,321,331,341 surrounding insulating material 342 and an outer tube 313 , 323 , 333 , 343 are composed. In the production form according to the prior art, because of the different geometries of the electrical conductors 311,321,331,341 and different lengths of the area with the surrounding insulating material 342 Outer tube 313 , 323 , 333 , 343 are assembled, 12 different components are kept in stock. According to the invention, on the other hand, only the rod material has to be stored from which all these and even more different electrical feedthroughs can be produced in a quick and simple manner.

List of reference symbols

100,200,310,320,330,340

electrical feedthrough

110,210,311,321,331,341

electrical conductor

120,220,342

Insulating material

121.122

End faces of the insulating material

130,230,313,323,333,343

Outer tube

131,132,231,232,314,315,

324,325,334,335,344,345

End faces of the outer tube

141.142

Space

211.212

Ends of the electrical conductor

290

Bar stock

295

Tool

L, L '

Length of electrical conductor

1

Length of the outer tube

d, d '

distance

Claims (4)

Process for the production of an electrical bushing (200,310,320,330,340) for the power supply of the electrical exhaust gas heater of a vehicle, wherein the implementation has an outer tube (230,313,323, 333,343) which has an interior, and an electrical conductor (210,311,321, 421) penetrating the interior of the outer tube (230,313,323,333, 343), the ends of which are at least one of the end faces (231,232,314, 315,324,325,334,335,344,345) of the outer tube (230,313, 323,333,343) protrude beyond the outer tube (230,313,323,333, 343), wherein the electrical conductor (210,311,321,421) in the interior of the outer tube (230,313,323,333,343) is surrounded by an insulating material (120,220,342) and wherein the entire arrangement of the outer tube (230,313,323,333,343), electrical conductor (210,311,321,421) and insulating material (220,342) is compressed, with the steps a) providing the outer tube (230,313,323,333,343) with the interior through which the electrical conductor (210,311,321,421) passes, which is surrounded by the insulating material (120,220,342) in the interior of the outer tube (230,313,323,333,343), in the form of a compressed rod material (290), b) removing the outer tube (230,313,323,333,343) at sections of the rod material which are spaced from one another by a length which corresponds to the desired length of the outer tube (230,313, 323,333,343) of the feedthrough (200,310, 320,330,340) to be produced, the length of the sections being spaced apart which the outer tube (230,313, 323,333,343) is removed, corresponds to the respectively desired protrusion of the electrical conductor (210,311,321,421) relative to the end face (231,232,314,315,324,325,334,335,344,345), c) removing the insulating material on (220,342) sections of the rod material (290) which are spaced apart from one another by a length which corresponds to the desired length of the outer tube (230,313, 323,333,343) of the bushing (200,310, 320,330,340) to be produced, the length of the Sections on which the insulating material (220,342) is removed corresponds to the respectively desired projection (d1, d2) of the electrical conductor (210,311,321,421) relative to the end face (231, 232,314,315, 324,325,334, 335,344,345), and d) cutting off a section of the rod material (290), the length of which corresponds to the desired length (L) of the electrical conductor (210,311,321,421) of the bushing (200,310,320,330,340) to be produced. Procedure according to Claim 1 , characterized in that in a further processing step the ends of the electrical conductor (210,311,321,421) penetrating the interior of the outer tube (230,313,323,333,343) penetrating the outer tube (230,313,323,333,343) are brought into a desired shape in a further processing step. Procedure according to Claim 1 or 2 , characterized in that the further processing step, with which the end faces (231,232,314,315, 324,325,334,335,344,345) of the outer tube (230,313,323,333,343) protruding ends of the electrical conductor (210,313,323,333,343) penetrating the interior of the outer tube (230,313,323,333,343), are brought into the desired shape , in particular turning or milling is or includes. Method according to one of the preceding claims, characterized in that the surface of the outer tube (230,313,323,333,343) is modified in a further processing step.

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