EP3944432B1 - Method for the production of a sleeve for a coaxial plug-in connector, especially a mini-coaxial automotive connector - Google Patents

Description

The invention relates to a method for producing a sleeve for a coaxial connector, in particular a mini coaxial automotive connector, and to a sleeve produced by this method.

Connectors, particularly connectors for automotive applications, often have coaxial connectors for signal transmission. Furthermore, standards have been established in the automotive sector that define the requirements for connectors. For example, standardized FAKRA (plug) connectors are well known. FAKRA is a standards committee for automotive technology in the German Institute for Standardization, which represents international standardization interests in the field of automotive technology. Coaxial connectors, particularly FAKRA-compliant coaxial connectors, have sleeves surrounding an internal contact that are very small and have only a small wall thickness.

The publication also describes JP 2008 098126 A a method of manufacturing a high frequency connector of the SMB type, which is provided with a cylindrical part in the center of which a connecting pin is provided, and with an annular insulating part in the center of which the connecting pin housed inside the cylindrical part is fixed. The cylindrical part has an annular recess on its outer peripheral surface and is provided with a protruding part on an inner peripheral surface of the recessed part.

It is challenging to produce sleeves, especially sleeves for mini coaxial automotive connectors, which have correspondingly thin wall thicknesses.

Therefore, it is the object of the present invention to propose an alternative method for producing a sleeve for coaxial connectors, with which sleeves with correspondingly thin wall thicknesses can be reliably produced.

This object is achieved by a method according to the independent claim. Preferred embodiments are defined in the dependent claims.

• Bereitstellen eines Ausgangswerkstücks zur Herstellung der Hülse;
• Walzen des Ausgangswerkstücks, um eine erste Form des Ausgangswerkstücks bereitzustellen, welche eine vorbestimmte Materialstärke und Größe aufweist,
• Umformen des gewalzten Ausgangswerkstücks, welches die erste Form aufweist, in eine zweite Form, wobei die zweite Form im Wesentlichen hülsenförmig ist und eine erste vorbestimmte Wandstärke und einen ersten vorbestimmten Außendurchmesser aufweist, und
• Ziehen des Ausgangswerkstücks, welches die zweite Form aufweist, in eine dritte hülsenförmige Form, wobei die dritte Form eine zweite vorbestimmte Wandstärke und einen zweiten vorbestimmten Außendurchmesser aufweist, und wobei die zweite vorbestimmte Wandstärke und der zweite vorbestimmte Außendurchmesser der Wandstärke und dem Außendurchmesser einer Soll-Hülse entsprechen.

One aspect relates to a method for producing a sleeve for a coaxial connector, in particular a mini coaxial automotive connector, comprising the following steps:

• Providing a starting workpiece for producing the sleeve;
• Rolling the starting workpiece to provide a first shape of the starting workpiece having a predetermined material thickness and size,
• Forming the rolled starting workpiece having the first shape into a second shape, the second shape being substantially sleeve-shaped and having a first predetermined wall thickness and a first predetermined outer diameter, and
• Drawing the starting workpiece having the second shape into a third sleeve-shaped shape, the third shape having a second predetermined wall thickness and a second predetermined outer diameter, and the second predetermined wall thickness and the second predetermined outer diameter corresponding to the wall thickness and the outer diameter of a desired sleeve.

Preferably, a sleeve for a coaxial connector can be manufactured in just a few steps using the proposed method. Furthermore, the proposed method can be used to easily manufacture a sleeve that has the outer diameter and wall thickness of a target sleeve. A target sleeve is understood to be a sleeve that is considered a model or ideal sleeve and specifies the shape properties to be achieved for a sleeve to be manufactured.

Sleeves produced using the method are in particular sleeves which are used in a mini coaxial automotive connector. An internal contact is generally arranged in corresponding sleeves, for example a pin-shaped or socket-shaped internal contact which is electrically insulated from the sleeve, for example by an insulating element.

Furthermore, in the proposed method, the second predetermined wall thickness is smaller than the first predetermined wall thickness and the second predetermined outer diameter is smaller than the first predetermined outer diameter.

The coaxial connector thus obtained can further be used in a connector that can be connected to a suitable connector device.

In addition, the initial workpiece provided has a substantially flat and rectangular shape. Furthermore, the initial workpiece has an initial surface area or size and initial material thickness. By rolling the initial workpiece, the surface area of the initial workpiece can be increased and the material thickness of the initial material can be reduced. When the predetermined material thickness and size is reached, the rolling of the initial workpiece can be stopped. Alternatively, the rolling can be stopped when the predetermined material thickness is reached and the rolled initial workpiece can be cut into workpieces corresponding to the predetermined size, for example with a laser. Advantageously, this allows a large number of intermediate workpieces to be obtained from the initial workpiece, which can be further processed into a sleeve or sleeves.

By the step of forming the rolled starting workpiece having the first shape, the flat and substantially rectangular starting workpiece is first formed into a sleeve shape in which two edges of the starting workpiece are unconnected and opposite each other.

• Verbinden der zwei gegenüberliegenden Kanten des Ausgangswerkstücks zu einer Hülsenform, um die zweite Form bereitzustellen.

In addition, the step of forming the rolled initial workpiece into the second shape further comprises:

• Joining the two opposite edges of the original workpiece into a sleeve shape to provide the second mold.

Preferably, the sleeve shape, which is still open in the longitudinal direction, can be closed by connecting the two opposite edges. Preferably, the two opposite edges can be connected by a material-locking connection, in particular welding, of the two opposite edges.

• Schneiden des Ausgangswerkstücks, welches die dritte Form aufweist, quer zur Längsrichtung des Ausgangswerkstücks, um eine Anzahl von geschnittenen Hülsen zu erhalten. Vorteilhafterweise kann das die dritte Form aufweisende Ausgangswerkstück durch das Schneiden auf Länge der Soll-Hülse geschnitten werden. Entsprechend weist die hergestellte Hülse die Wandstärke, den Außendurchmesser und die Länge der Soll-Hülse auf.

Preferably, the method may further comprise:

• Cutting the initial workpiece, which has the third shape, transversely to the longitudinal direction of the starting workpiece in order to obtain a number of cut sleeves. Advantageously, the starting workpiece having the third shape can be cut to the length of the target sleeve by cutting. Accordingly, the sleeve produced has the wall thickness, the outer diameter and the length of the target sleeve.

Preferably, the starting material can have a length which makes it possible to cut a plurality of sleeves, which have the length of the target sleeve, from the starting workpiece having the third shape. Advantageously, the manufacturing process for sleeves can thus be designed efficiently.

• Prägen des Ausgangswerkstücks welches die dritte Form aufweist, um einen Hülsensockel bereitzustellen. Insbesondere können die durch den Schritt des Schneidens erhaltenen Hülsen dem Prägen-Schritt unterzogen werden, um einen Hülsensockel an den Hülsen bereitzustellen. Der Hülsensockel ist ferner an einem Ende der Hülse ausgebildet und ist radial nach außen gerichtet.

Preferably, the method may further comprise:

• Stamping the starting workpiece having the third shape to provide a sleeve base. In particular, the sleeves obtained by the cutting step may be subjected to the stamping step to provide a sleeve base on the sleeves. The sleeve base is further formed at one end of the sleeve and is directed radially outward.

Furthermore, the second predetermined wall thickness can be in the range of 0.1 mm to 0.5 mm, preferably in the range of 0.2 mm to 0.4 mm, and particularly preferably approximately 0.3 mm.

Furthermore, the second predetermined outer diameter can be between 2.0 mm and 4.0 mm, preferably between 2.2 mm and 3.0 mm, and particularly preferably approximately 2.8 mm.

Furthermore, the length of a resulting sleeve including the base can be between 9 mm and 12 mm, preferably between 9.5 mm and 11.5 mm, and particularly preferably approximately 9.75 mm.

Preferably, the starting workpiece can consist of an austenitic metal alloy, which is preferably non-magnetic. Furthermore, the metal alloy can have a chromium content of at least 8%, in particular of at least 18%. Particularly preferably, the metal alloy can have a Chromium content of approximately 18.27%. The metal alloy advantageously has little or no magnetic conductivity.

Preferably, the method may comprise:
Heat treatment of the initial workpiece.

Preferably, the heat treatment can be carried out before the starting workpiece is machined or the sleeves can be subjected to the heat treatment.

A further aspect relates to a sleeve for a coaxial connector, in particular a mini coaxial automotive connector, manufactured according to the previously disclosed method.

An embodiment of the invention is described in more detail below with reference to the accompanying figures. It is understood that the present invention is not limited to this embodiment and that individual features of the embodiment can be combined to form further embodiments within the scope of the accompanying claims.

Figur 1

eine perspektivische Ansicht eines Steckverbinders bestehend aus einem Gehäusekörper und einem Verbindungsgehäuse,

Figur 2

eine perspektivische Ansicht des Steckverbinders, bei dem Gehäusekörper und Steckverbinder miteinander verbunden sind,

Figur 3

eine Explosionszeichnung des Gehäusekörpers,

Figur 4

eine perspektivische Ansicht des Verbindungsgehäuses und des Gehäusekörpers im Querschnitt,

Figur 5

eine perspektivische Ansicht der Unterseite des Steckverbinders,

Figur 6

einen Innenkontakt für einen Koax-Steckverbinder,

Figur 7

den Innenkontakt mit angeordneten Isolationselement,

Figur 8

eine Ansicht der Vorderseite des Verbindungsgehäuses,

Figur 9

eine Seitenansicht der Hauptseite des Gehäusekörpers,

Figur 10

eine Seitenansicht der Oberseite des Gehäusekörpers,

Figur 11

eine Seitenansicht der Unterseite des Gehäusekörpers,

Figuren 12 bis 14

eine zweite Ausführungsform des Gehäusekörpers, und

Figur 15

eine dritte Ausführungsform des Gehäusekörpers.

Show it:

Figure 1

a perspective view of a connector consisting of a housing body and a connection housing,

Figure 2

a perspective view of the connector in which the housing body and connector are connected to each other,

Figure 3

an exploded view of the housing body,

Figure 4

a perspective view of the connector housing and the housing body in cross section,

Figure 5

a perspective view of the bottom of the connector,

Figure 6

an internal contact for a coaxial connector,

Figure 7

the internal contact with arranged insulation element,

Figure 8

a view of the front of the connection housing,

Figure 9

a side view of the main side of the housing body,

Figure 10

a side view of the top of the housing body,

Figure 11

a side view of the bottom of the housing body,

Figures 12 to 14

a second embodiment of the housing body, and

Figure 15

a third embodiment of the housing body.

Figure 1 shows a connector 10 consisting of a housing body 12 and a connection housing 14, which can be plugged onto the housing body 12. The connector 10 is designed in particular as a mini-coax automotive connector and can be connected to a compatible plug device. The housing body 12 also consists of a main housing body section 16 and a receiving base 18 arranged on the main housing body section 16, which points in the direction of a connection direction V. The connection direction V is to be understood as the direction in which the connector 10 must be moved in order to plug the housing body 12 into the connection housing 14 or to connect the connector 10 to a compatible plug device (not shown).

Furthermore, the housing body 12 has four coaxial connectors 20, which are arranged at least in sections in the housing body 12. The four coaxial connectors 20 are aligned essentially parallel to one another and are led out of the housing body 12 via the receiving base 18. The four coaxial connectors 20 extend from the receiving base 18 in the connection direction V.

The connection housing 14 has a receiving base side section 22 which can be plugged onto the receiving base 18. When the connection housing 14 is connected to the housing body 12, the receiving base side section 22 is plugged onto the receiving base 18 and the receiving base 18 is preferably completely inserted into the receiving base side section 22. Furthermore, the connection housing 14 has a plug device side section 24 into which the compatible plug device can be plugged in order to connect corresponding coaxial sockets of the plug device to the coaxial plug connectors 20.

The connector 10 can in particular be a standard-compliant connector which, for example, conforms to a FAKRA standard or USCAR standard. Furthermore, the connector 10 has a shape coding 26 formed on the connection housing 14, which ensures that the connection housing 14 has exactly one insertion possibility for inserting the compatible connector device. As in Figure 1 As shown, the shape coding 26 can consist of one or more grooves 26 which extend along the connection direction V on the inside of the plug device-side section 24 of the connection housing 14.

Furthermore, the connection housing 14 is designed to be fastened to the housing body 12 or to the receiving base 18 in at least two different orientations. In particular, the connection housing 14 can be fastened to the housing body 12 in different orientations by rotating the connection housing 14 by 90° in each case about a center axis Z, which extends from the center of the receiving base 18 in the direction of the connection direction V. In the Figure 1 In the embodiment shown, the connector housing 14 can be arranged in (exactly) four different orientations on the housing body 12 or on the receiving base 18. In each of these orientations, the coaxial connectors 20 are assigned to different or other coaxial sockets of the compatible connector device. Furthermore, Figure 2 by way of example, how the connection housing 14 is arranged in a first orientation on the housing body 12 or on the receiving base 18.

How to continue in Figure 1 As shown, the receiving base 18 has a front side 28 pointing in the connection direction V, which is essentially perpendicular to the connection direction V. This means that the normal vector of the front side 28 is essentially parallel to the connection direction V. The front side 28 has a substantially square shape (see also Figures 3 and 4 ), wherein from the four sides of the front side 28 a narrow side 30 extends in the opposite direction to the connection direction V in the direction of the main housing body section 16 in order to connect the front side 28 to the main housing body section 16. Furthermore, the narrow sides 30 each have a securing feature 32, which can be connected to corresponding Security features 34 (see Figure 4 ) of the connection housing 14 to secure the connection housing 14 to the housing body 12 or the receiving base 18.

Figure 3 shows a perspective exploded view of the housing body 12. In order to keep the representation of the housing body 12 clear, only two of the four coaxial connectors 20 are shown. The housing body 12 consists of a first housing body element 36 and a second housing body element 38, wherein the second housing body element 38 can be inserted into the first housing body element 36. Furthermore, the first housing body element 36 has the receiving base 18, in which four through openings 40 are formed, which extend in the connection direction V. The through openings 40 are such that the coaxial connectors 20 are led out of the housing body 12 by means of the through openings 40, pointing outwards in the connection direction V.

Referring to the Figures 3 , 6 and 7 , the structure of a coaxial connector 20 is explained in more detail. A coaxial connector 20 has an electrically conductive inner contact 42 (see Figures 6 and 7 ) which is essentially flat and elongated. Furthermore, the inner contact 42 is designed to connect a coaxial socket of the compatible plug device to a circuit board.

The inner contact 42 can in particular be punched from a flat starting workpiece. For example, a sheet of electrically conductive metal that has a predetermined material thickness can be used as the flat starting workpiece. The material thickness of the electrically conductive starting workpiece can be, for example, between 0.2 mm and 0.4 mm and preferably approximately 0.3 mm or exactly 0.3 mm.

The inner contact 42 can be divided into a first contact section 44 and a second contact section 46, wherein the second contact section 46 is angled relative to the first contact section 44 by a predetermined angle (see Figure 3 to Figure 6 ). In the example shown, the first contact section 44 is angled by approximately 90° relative to the second contact section 46.

As in the Figures 6 and 7 As shown, the inner contact 42 has a coaxial socket-side end section 110 in the region of the first contact section 44, which is formed at one end of the inner contact 42. Furthermore, the coaxial socket-side end section 110 is designed to engage in a socket-shaped inner contact of a corresponding coaxial socket of the compatible plug device.

Furthermore, the inner contact 42 can have a circuit board-side end section 112 in the region of the second contact section 46, which is formed at the other end of the inner contact 42. The circuit board-side end section 112 is designed to be electrically connected to the circuit board. In particular, it can be provided that the circuit board-side end section 112 is led out of the housing body 12 so that the circuit board-side end section 112 can be arranged in a through-opening of the circuit board in order to electrically connect the coaxial connector 20 to the circuit board.

Preferably, the coaxial socket-side end section 110 and/or the circuit board-side end section 112 can be formed by embossing the inner contact 42. In particular, the inner contact 42 punched from the starting workpiece can be subjected to an embossing process in which the coaxial socket-side end section 110 and/or the circuit board-side end section 112, which after punching have a substantially rectangular cross section (transverse to the longitudinal direction of the inner contact 42), are reshaped so that the cross section is substantially round and/or oval. Embossing is particularly advantageous because burr formation on the coaxial socket-side end section 110 and/or the circuit board-side end section 112 can be prevented.

Preferably, the coaxial socket-side end section 110 and the circuit board-side end section 112 have a substantially round or oval cross-section transverse to the longitudinal direction of the inner contact. The cross section/diameter of the coaxial socket-side end section 110 can be, for example, 0.2 mm to 0.4 mm. The cross section of the coaxial socket-side end section 110 can particularly preferably have a substantially rectangular basic shape with dimensions of approximately 0.3 mm * 0.37 mm, with a radius of approximately 0.1 mm being embossed on all edges. Due to the embossed radius, the cross section of the coaxial socket-side end section 110 has the previously mentioned substantially round or oval shape. The diameter of the circuit board-side end section 112 can be, for example, 0.2 mm to 0.5 mm. The cross section of the circuit board-side end section 112 can particularly preferably have a substantially rectangular basic shape with dimensions of approximately 0.3 mm * 0.37 mm, with a radius of approximately 0.1 mm being embossed on all edges.

As in Figure 7 As shown, the inner contact 42 in the region of the first contact section 44 is surrounded at least in sections along the longitudinal direction of the inner contact 42 by a first dielectric insulation element 48, the coaxial socket-side end section 110 being exposed, i.e. not surrounded by the first dielectric insulation element 48. Likewise, the inner contact 42 in the region of the second contact section 46 is surrounded at least in sections by a second dielectric insulation element 50, the first dielectric insulation element 48 and the second dielectric insulation element 50 being arranged at a distance from one another on the inner contact 42 when the inner contact 42 is not angled. Likewise, the circuit board-side end section 112 is exposed and not surrounded by the second dielectric insulation element 50. The first dielectric insulation element 48 and the second dielectric insulation element 50 can be connected to or arranged on the inner contact 42, in particular using an injection molding process. For example, the inner contact 42 can be arranged on an injection mold which provides recesses for the first dielectric insulation element 48 and/or the second dielectric insulation element 50. The injection mold or the recesses can be filled with a liquefied dielectric insulation material or a plastic, and the insulation material is then solidified, for example by cooling. The inner contact 42 can then be arranged first dielectric insulation element 48 and/or second dielectric insulation element 50 can be removed from the injection mold. The insulation elements thus produced can also be referred to as insulation bodies in which the inner contact 42 is arranged at least in sections.

Furthermore, the first dielectric insulation element 48 and the second dielectric insulation element 50 each have a stop surface 52 (see Figure 7 ), which limit the bending of the first contact section 44 relative to the second contact section 46 to the predetermined angle, for example to approximately 90°. When the predetermined angle is applied, the stop surface 52 of the first dielectric insulation element 48 and the second dielectric insulation element 50 are aligned substantially parallel to one another.

How to continue in Figure 7 As shown, the first dielectric insulation element 48 has a sleeve section 56 which at least partially surrounds the inner contact 42 along the connection direction V. The sleeve section 56 adjoins (directly) the coaxial socket-side end section 110 opposite to the connection direction V. A housing section 58 of the first dielectric insulation element 48 adjoins (directly) the sleeve section 56 opposite to the connection direction V.

The sleeve section 56 has a substantially cylindrical shape, wherein the cylinder axis of the sleeve section 56 lies substantially parallel to the longitudinal direction of the first contact section 44 and substantially coincides with the coaxial socket-side end section 110. The housing section 58 has a rectangular, preferably square, cross-section transverse to the longitudinal direction. Furthermore, the cross-sectional area of the housing section 58 is selected to be larger than the cross-sectional area of the sleeve section 56, so that a stop or shoulder is formed at the transition from the sleeve section 56 to the housing section 58, which is referred to below as the sleeve stop 114.

As from Figure 3 As can be seen, the coaxial connector 20 has a substantially hollow-cylindrical sleeve 54, which can be pushed onto the sleeve section 56 in the opposite direction to the connection direction V. The Sleeve 54 has a sleeve base 55 which is formed radially outward and which rests against the sleeve stop 114. Furthermore, the first dielectric insulation element 48 electrically insulates the sleeve 54 from the inner contact 42. Furthermore, the sleeve 54 completely surrounds the coaxial socket-side end section 110 along the connection direction V. The sleeve 54 and the coaxial socket-side end section 110 are thus designed to be connected to a coaxial socket of the compatible plug device. Furthermore, it is provided that the sleeve section 56 is arranged between the sleeve 54 and the inner contact 42.

Furthermore, the second dielectric insulation element 50 has a rectangular, preferably square, cross-section transverse to the longitudinal direction of the inner contact 42.

Referring to the Figures 3 and 4 the assembly of the connector 10 is explained in more detail. As can be seen from the Figure 4 As can be seen from the cross-sectional view shown, the first housing body has a first insulation element receiving space 60 which adjoins the through-opening 40 of the receiving base 18 opposite to the connection direction V. In the assembled state of the plug connector 10, the first contact section 44 is arranged at least in sections in the first insulation element receiving space 60 and the through-opening 40. In particular, the first contact section 44 is inserted with the coaxial socket-side end section 110 first, in the connection direction V, into the first insulation element receiving space 60 and into the through-opening 40 in order to guide the sleeve 54 out of the housing body 12. The through-opening 40 lies flat against the sleeve 54. The first insulation element receiving space 60 has a rectangular, preferably square, cross-section transverse to the connection direction V, so that the first dielectric insulation element 48 is arranged in a form-fitting manner in the first insulation element receiving space 60.

Furthermore, the first insulation element receiving space 60 can have a larger cross-section than the passage opening 40, so that the transition from first insulation element receiving space 60 to the through-opening 40 provides a stop 115 or shoulder. In particular, the sleeve stop 114 formed by the sleeve section 56 and the housing section 58 can rest against the stop 115 formed by the through-opening 40 and the first insulation element receiving space 60 when the coaxial connector 20 or the first contact section 44 of the coaxial connector 20 is guided in the connection direction V into the first insulation element receiving space 60 and then through the through-opening 40. Furthermore, the sleeve base 55 can be arranged between the two stops 114/115, whereby the sleeve 54 is secured in the housing body 12.

Before or preferably after inserting the coaxial connector 20 into the first housing body member 36, the second contact portion 46 may be angled to the predetermined angle with respect to the first contact portion 48.

Subsequently, the second housing body element 38 is introduced into the first housing body element 36 such that the second contact section 46 and in particular the circuit board-side end section 112 is led out of the second housing body element 38 and thus out of the housing body 12 or to the outside.

The second housing body element 38 has in particular a second insulation element receiving space 62, which is designed to receive the second dielectric insulation element 48 preferably in a form-fitting manner. The longitudinal direction of the second insulation element receiving space 62 is essentially perpendicular to the connection direction V or corresponds to the longitudinal direction of the second contact section 46. Furthermore, the second insulation element receiving space 62 has a substantially rectangular, preferably square, cross-section transverse to the longitudinal direction, so that the second dielectric insulation element 50 can be arranged in a form-fitting manner in the second insulation element receiving space 62. Furthermore, the second insulation element receiving space 62 provides an opening on the underside 64 of the second housing body element 38 or the housing body 12, via through which the second contact section 46 or the circuit board-side end section 112 can be guided outwards. The underside 64 of the second housing body element 38 or of the housing body 12 faces the circuit board when the housing body 12 is arranged on the circuit board.

Furthermore, the housing section 58 of the first dielectric insulation element 48 has guide elements 59 (see Figure 3 ), which support the insertion of the first dielectric insulation element 48 into the first housing body element 36 or into the first insulation element receiving space 62. The guide elements 59 can in particular be designed as projections on the housing section 58.

The second housing body element 38 has a total of four second insulation element receiving spaces 66, in each of which a second dielectric insulation element 50 can be arranged in a form-fitting manner. Furthermore, the second housing body element 38 has two receiving areas 66/68 that are stepped relative to one another, with each receiving area 66/68 providing two second insulation element receiving spaces 63. Furthermore, the four second insulation element receiving spaces 63 are each separated from one another by walls 70 of the second housing body element 38. Furthermore, the second insulation element receiving spaces 62 are open towards the underside 64. Furthermore, the second insulation element receiving spaces 62 in the respective receiving areas 66/68 are designed to be of different lengths, with second insulation element receiving spaces 62 of the same receiving area 66/68 being of the same length. The second dielectric insulation elements 50 assigned to the respective second insulation element receiving spaces 62 are also designed to be of the same length.

With reference to Figure 5 the underside of the connector 10 is explained in more detail. The first housing body 12 or the main housing body section 16 has two opposite side walls 72, which extend from the underside 64 of the housing body 12 to an upper side 74 of the housing body 12. Furthermore, the side walls 72 of the first housing body element 12 are aligned substantially parallel to the connection direction V. Furthermore the two side walls 72 are spaced apart from one another, so that the second housing body element 38 is arranged between the two side walls 72 of the first housing body element 36. Two plug contacts 74 are formed on the underside of the two side walls 72, by means of which the housing body 12 can be connected to a circuit board. In particular, the plug contacts 74 can be inserted into insertion holes formed on the land circuit board and then connected to the circuit board, for example by soldering.

Furthermore, each side wall 72 has a support element 76 with a support surface 78 on the underside 64. The support element 76 and the support surface 78 serve to support the housing body 12 or the connector 10 on the circuit board, so that the coaxial connectors 20, which preferably serve for electrical contact, and the plug contacts 74 do not have to additionally "carry" the weight of the connector 10 or the housing body 12. In addition, the connector 10 has advantages in terms of vibration resistance. Furthermore, the support elements 76 and/or the plug contacts 74 can be used to dissipate heat from the circuit board. The second housing body element 38 also has one or more support elements 76 with corresponding support surfaces 78 on the underside 64.

Furthermore, deformable securing elements 80 are formed on the underside 64 of the side walls 72, with which the second housing body element 38 can be secured to the first housing body element 36. Securing is understood to mean that the second housing body element 38 cannot be separated from the first housing body element 36. In particular, each side wall 72 has one, preferably exactly one, deformable securing element 80 at an end of the underside 64 lying in the connecting direction V and at an end of the underside 64 lying opposite the connecting direction V. The securing element 80 is in each case formed as a projection which extends away from the housing body 12, starting from the underside 64. Furthermore, the second housing body element 38 has recesses 82 on the underside, into which the securing elements 80 engage when the securing elements 80 are deformed or pushed in the direction of the opposite side wall 72. are bent over. In particular, the recesses 82 are each provided in the corners of the underside 64 of the second housing body element 38.

With reference to Figure 4 The connection housing 14 is explained in more detail below. A partition 84 is arranged between the receiving base-side section 22 and the plug device-side section 24, which is arranged essentially perpendicular to the connection direction V. The partition 84 also has four through-openings 86 through which the four coaxial plug connectors 20 are led. Furthermore, the plug device-side section 24 surrounds the four coaxial plug connectors 20 at least in sections in the connection direction. In particular, the plug device-side section 24 consists of a wall 88 which extends from the partition 84 in the direction of the connection direction V. Furthermore, the partition 84 and the wall 88 of the plug device-side section delimit a receiving space into which the compatible plug device is inserted in the direction of the insertion direction E.

Starting from the partition wall 84, a wall 90 of the receiving base side section 22 of the connection housing 14 extends against the connection direction V. The partition wall 84 and the wall 90 delimit the receiving base side section 22 into which the receiving base 18 is inserted or plugged. Furthermore, the partition wall 84 rests against the front side 28 of the receiving base 18. Likewise, the inside of the wall 90 of the receiving base side section 22 rests against the narrow sides 30 of the receiving base 18. As in Figure 4 As shown, the securing features 34 of the connection housing 14 are formed on the inside of the wall 90 of the receiving base-side section 22, which cooperate with the securing features 32 of the receiving base 18 in order to secure the connection housing 14 to the housing body 12. In particular, the securing features 34 of the connection housing 14 can be formed as recesses.

The security features 32 of the receiving base can be designed as projections which are arranged externally on the narrow sides 30. In particular, each of the four narrow sides 30 can have a security feature 32 and the inside of the wall 90 corresponding security features 34. Referring to Figure 7 the securing feature 32 of the receiving base 18, designed as a projection, has a ramp 92 sloping in the connection direction V. Contrary to the connection direction V, the securing feature 32 designed as a projection slopes down in a step-like manner or vertically onto the narrow side 30. In particular, this means that the connection housing 14 cannot be separated from the housing body 12 without causing damage, since the shape of the securing feature 32 designed as a projection results in at least damage to the connection housing 14.

As in Figure 4 As shown, the front side 28 of the receiving base 18 has two positioning projections 94 spaced apart from one another, which extend from the front side 28 in the connection direction V. Furthermore, the partition wall 84 of the connection housing 14 has four positioning openings 96 (cf. Figure 8 ), About what Figure 3 due to the sectional drawing, only three positioning openings 96 are shown at least partially. The positioning projections 94 and the positioning openings 96 are arranged such that in each orientation of the connection housing 14 on the housing body 12, a positioning projection 94 engages in another positioning opening 96.

The positioning openings 96 and positioning projections 94 essentially have a triangular shape, preferably an isosceles triangular shape and particularly preferably a simultaneous triangular shape. Furthermore, the two positioning projections 94 are arranged opposite one another on the front side 28 of the receiving base 18. Each positioning projection 94 is aligned centrally on an edge 31, which is formed by the front side 28 and a narrow side 30. In particular, one side of the triangle can be aligned on the edge 31. Furthermore, in the case of an isosceles triangle, the base is aligned on the edge 31. Furthermore, the four positioning openings 96 are arranged on the partition wall 84 in accordance with the positioning projections 94. In particular, the four positioning openings 96 are formed offset at intervals of 90° in the partition wall 84. In particular, the four positioning openings 96 can be arranged on the partition wall 84 in such a way that two imaginary connecting lines, each of which connects two opposing positioning openings 96, have a common intersection point. With respect to this intersection point, the four positioning openings 96 are formed in the partition wall 84 at intervals of 90° (the intersection point forms the center of an imaginary circle on which the four positioning openings 96 lie). Furthermore, an imaginary straight line, which runs essentially perpendicular to the partition wall 84 and through the common intersection point, intersects an imaginary connecting line which connects the two positioning projections 94 to one another in such a way that the two positioning projections 94 are equidistant from the imaginary straight line. Furthermore, the imaginary straight line runs through the center of the front side 28 of the receiving base 18.

As in Figure 1 As shown, the housing body 12 has recesses 98 on its outer wall, which are Figures 9 -11 will be explained in more detail. The recesses 98 can in particular be designed as depressions which are formed on the outer wall of the housing body 12. The housing body 12 or the main housing body section 16 has two opposite main sides 100 on the outside, which are formed by the side walls 72 of the first housing body element 36 and which connect the underside 64 of the housing body 12 to an upper side 102 of the housing body 102 opposite the underside. The main sides 100, the upper side 102 and the lower side 64 extend essentially parallel to the connection direction V. Furthermore, the main sides 100 correspond to the outer sides of the side walls 72 of the first housing body element 36.

A first pair of recesses 104 and a second pair of recesses 106 are formed on both main sides 100 or in both side walls 72, wherein the first pair of recesses 104 extends from the top side 102 in the direction of the bottom side 64 and the second pair of recesses 106 extends from the bottom side 64 in the direction of the top side 102. The longitudinal direction of the recesses 98 is substantially perpendicular to the connection direction V.

The recesses 98 are designed such that the depth a of the first pair Recesses 104 is larger than the width b of the first pair of recesses 106 (cf. Figure 10 ), and the depth d of the second pair of recesses 106 is smaller than the width e of the second pair of recesses 106 (cf. Figure 11 ). Furthermore, the first pair of recesses 104 and the second pair of recesses 106 on the two main sides 100 are not continuous and are located opposite each other (cf. Figure 9 ).

In particular, the width b of a recess 98 of the first pair of recesses 104 and the width e of a recess 98 of the second pair of recesses 106 can correspond to 0.04 times to 0.08 times, particularly preferably approximately 0.057 times, the total width B of the housing body 12 along the connection direction V. The total width B of the housing body can also be viewed as the distance between two fictitious planes, each of which is perpendicular to the connection direction V, and wherein a first fictitious plane of the two fictitious planes is located at an end of the housing body 12 lying in the connection direction V (without coaxial connector) and a second fictitious plane of the two fictitious planes is located at an end of the housing body 12 lying opposite the connection direction V. The total width B of the housing body 12 can, for example, be in the range between 11 mm and 18 mm and preferably in the range between 13 mm and 16 mm. In a particularly preferred embodiment, the total width B of the housing body 12 is substantially 15.8 mm and the width b of a recess 98 of the first pair of recesses 104 and the width e of a recess 98 of the second pair of recesses 106 are substantially 0.9 mm.

Furthermore, the depth a of a recess 98 of the first pair of recesses 104 can be 0.10 times to 0.14 times the distance T between the two opposite main sides 100. In a particularly preferred embodiment, the depth a of a recess 98 of the first pair of recesses can be approximately 0.117 times the distance T between the two opposite main sides 100.

Furthermore, the depth d of a recess 98 of the second pair of recesses 106 can be 0.045 times to 0.07 times the distance T between the two opposite main sides 100. In the particularly preferred embodiment, the depth d of a recess 98 of the second pair of recesses 106 is approximately 0.055 times the distance T between the two opposite main sides 100.

For example, the distance T between the two main sides 100 of the housing body 12 can be 10 mm to 13 mm. In the particularly preferred embodiment, the distance T between the two main sides 100 of the housing body 12 is approximately 12 mm, the depth a of a recess 98 of the first pair of recesses 104 is approximately 1.41 mm, and the depth d of a recess 98 of the second pair of recesses 106 is approximately 0.66 mm.

Furthermore, the first pair of recesses 104 and the second pair of recesses 106 are spaced apart from a rear side 108 of the housing body by at least 0.15 times and a maximum of 0.25 times the total width B of the housing body along the connection direction V. In the particularly preferred embodiment, the first pair of recesses 104 and the second pair of recesses 106 can be spaced apart from the rear side 108 of the housing body by approximately 3.1 mm. The rear side 108 is arranged opposite the front side 28 and delimits the housing body 12 opposite the connection direction V. Furthermore, the side of the housing body 12 which is substantially perpendicular to the connection direction V and faces opposite the connection direction can be regarded as the rear side 108 of the housing body 12.

Furthermore, the length c of the first pair of recesses 104 can correspond to 0.2 times to 0.4 times, preferably 0.3 times to 0.38 times the distance H between the bottom side 64 and the top side 102 of the housing body 12. In the particularly preferred embodiment, the length c of the first pair of recesses 104 can correspond to approximately 0.37 times the distance H between the bottom side 64 and the top side 102 of the housing body 12.

Furthermore, the length f of the second pair of recesses 106 can correspond to 0.3 times to 0.5 times, preferably 0.3 times to 0.44 times the distance H between the bottom side 64 and the top side 102 of the housing body. In the particularly preferred embodiment, the length f of the second pair Recesses 106 correspond to approximately 0.36 times the distance H between the bottom 64 and the top 102 of the housing body. For example, the distance H between the bottom 64 of the housing body 12 and the top 102 of the housing body 12 can be 10 mm to 14 mm, preferably 11 mm to 13 mm. In the particularly preferred embodiment, the distance H between the bottom 64 of the housing body 12 and the top 102 of the housing body 12 can be approximately 12.05 mm, wherein the length f of the second pair of recesses 106 can be approximately 5.7 mm and the length c of the first pair of recesses 104 can be approximately 4.45 mm.

Furthermore, the distance between the recesses 98 of the first pair of recesses 102 can be 1.3 times to 2.0 times the width b of a recess 98 of the first pair of recesses 102 and the distance between the recesses 98 of the second pair of recesses 106 can be 1.3 times to 2.0 times the width e of a recess 98 of the second pair of recesses 106.

Furthermore, Figure 11 how the support elements 76 with their support surfaces 78 are formed on the underside 64 of the first housing body element 36. The support surfaces 78 run essentially parallel to the underside 64 of the housing body 12 or the housing body element 36. Furthermore, the support elements 76 are arranged in the connection direction V between two plug contacts 74. The Figure 11 shown first pair of plug contacts 74, which is arranged in connection direction V in front of the second pair of plug contacts 74, forms a circuit board setting edge. The circuit board setting edge corresponds in particular to an imaginary connecting line that connects the first pair of plug contacts 74 to one another. The center of gravity of the plug connector 10 is selected such that the center of gravity lies behind the circuit board setting edge opposite to the connection direction V. This allows the plug connector 10 to be placed on the circuit board without the plug connector 10 tilting in relation to the circuit board. In particular, the center of gravity is selected such that it lies between two imaginary planes, the first imaginary plane running through the first pair of plug contacts 74, the second imaginary plane running through the second pair of plug contacts 74, and the first and second imaginary planes in the Essentially perpendicular to the connection direction V.

In the Figures 12 to 14 a second embodiment of the housing body 12 or the first housing body element 36 is shown. The second embodiment differs from the embodiment described above in that it only has the first pair of recesses 104 on the respective main sides 100 of the first housing body element 36. The first pair of recesses 104 each extend from the top side 102 of the housing body 36 in the direction of the bottom side 64 of the housing body 36.

Furthermore, the first pair of recesses 104, or a first recess 98 thereof, directly adjoins the rear side 108 of the housing body 36. The other recess 98 ends in the connection direction V approximately at the level of the transition from the receiving base 18 to the main housing body section 16.

In the second embodiment, the width b of a recess 98 of the first pair of recesses 104 may be 0.3 times to 0.4 times the total width B of the housing body 12 along the connection direction V (see Fig. 14 ). The total width B of the housing body 12 can be, for example, between 11 mm and 14 mm. In a particularly preferred embodiment, the total width B of the housing body 12 is substantially 12.72 mm and the width b of a recess 98 of the first pair of recesses 104 is substantially 4.1 mm.

Furthermore, the depth a of a recess 98 of the first pair of recesses 104 can be 0.07 times to 0.1 times the distance T between the two opposite main sides 100. For example, the distance T between the two main sides 100 of the housing body 12 can be 10 mm to 13 mm. In a particularly preferred embodiment, the depth a of a recess 98 of the first pair of recesses can be approximately 0.088 times the distance T between the two opposite main sides 100. For example, the distance T between the two main sides 100 of the housing body 12 is approximately 11.35 mm and the depth a of a recess 98 of the first pair of recesses 104 is approximately 1 mm. Furthermore, the length c of the first pair of recesses 104 can correspond to 0.7 times to 0.9 times the distance H between the bottom 64 and the top 102 of the housing body 12. In the particularly preferred embodiment, the length c of the first pair of recesses 104 can correspond to approximately 0.82 times the distance H between the bottom 64 and the top 102 of the housing body 12. For example, the distance H between the bottom 64 of the housing body 12 and the top 102 of the housing body 12 can be 10 mm to 14 mm, in the particularly preferred embodiment approximately 11.1 mm. Furthermore, in the particularly preferred embodiment, the length c of the first pair of recesses 104 can be substantially 9.1 mm.

Furthermore, the distance between the recesses 98 of the first pair of recesses 102 can be 0.6 times to 0.8 times the width b of a recess 98 of the first pair of recesses 102.

In the Figure 15 a third embodiment of the housing body 12 or the first housing body element 36 is shown. The third embodiment differs from the previously described embodiments in that the first housing body element 36 only has recesses 116 on the main sides 100, which are open towards the underside 64 and into which the second housing body element can engage with corresponding projections. The housing body 12 of the third embodiment preferably has a distance H between the underside 64 and the top side 102 of approximately 9.5 mm, a distance T between the two opposite main sides 100 of approximately 10.3 mm, and a total width B of the housing body 12 along the connecting direction V of approximately 13 mm.

• Bereitstellen eines Ausgangswerkstücks zur Herstellung der Hülse 54;
• Walzen des Ausgangswerkstücks, um eine erste Form des Ausgangswerkstücks bereitzustellen, welche eine vorbestimmte Materialstärke und Größe aufweist,
• Umformen des gewalzten Ausgangswerkstücks, welches die erste Form aufweist, in eine zweite Form, wobei die zweite Form im Wesentlichen hülsenförmig ist und eine erste vorbestimmte Wandstärke und einen ersten vorbestimmten Außendurchmesser aufweist, und
• Ziehen des Ausgangswerkstücks, welches die zweite Form aufweist, in eine dritte hülsenförmige Form, wobei die dritte Form eine zweite vorbestimmte Wandstärke und einen zweiten vorbestimmten Außendurchmesser aufweist, und wobei die zweite vorbestimmte Wandstärke und der zweite vorbestimmte Außendurchmesser der Wandstärke und dem Außendurchmesser einer Soll-Hülse entsprechen.

A method for producing the sleeve 54 of the coaxial connector 20 is described below. The method includes the following steps:

• Providing a starting workpiece for producing the sleeve 54;
• Rolling the starting workpiece to provide a first shape of the starting workpiece having a predetermined material thickness and size,
• Forming the rolled starting workpiece having the first shape into a second shape, the second shape being substantially sleeve-shaped and having a first predetermined wall thickness and a first predetermined outer diameter, and
• Drawing the starting workpiece having the second shape into a third sleeve-shaped shape, the third shape having a second predetermined wall thickness and a second predetermined outer diameter, and the second predetermined wall thickness and the second predetermined outer diameter corresponding to the wall thickness and the outer diameter of a desired sleeve.

Preferably, the sleeve 54 can be manufactured in a few steps using the proposed method. Furthermore, the proposed method can be used to easily manufacture a sleeve 54 that has the outer diameter and wall thickness of a target sleeve. A target sleeve is to be understood as a sleeve that is considered a model or ideal sleeve and that specifies the shape properties to be achieved for a sleeve 54 to be manufactured.

Furthermore, in the proposed method, the second predetermined wall thickness is smaller than the first predetermined wall thickness and the second predetermined outer diameter is smaller than the first predetermined outer diameter.

In addition, the initial workpiece provided has a substantially flat and rectangular shape. Furthermore, the initial workpiece has an initial surface or size and initial material thickness. By rolling the initial workpiece, the surface of the initial workpiece can be increased and the material thickness of the initial material can be reduced. When the predetermined material thickness and size is reached, the rolling of the initial workpiece can be stopped. Alternatively, the rolling can be stopped when the predetermined material thickness is reached and the rolled initial workpiece can be cut into workpieces according to the predetermined size, for example with a laser. Advantageously, this allows a large number of Intermediate workpieces can be obtained which can be further processed into a sleeve 54 or sleeves.

By the step of forming the rolled starting workpiece having the first shape, the flat and substantially rectangular starting workpiece is first formed into a sleeve shape in which two edges of the starting workpiece are unconnected and opposite each other.

• Verbinden der zwei gegenüberliegenden Kanten des Ausgangswerkstücks zu einer Hülsenform, um die zweite Form bereitzustellen.

In addition, the step of forming the rolled initial workpiece into the second shape further comprises:

• Joining the two opposite edges of the original workpiece into a sleeve shape to provide the second mold.

• Schneiden des Ausgangswerkstücks, welches die dritte Form aufweist, quer zur Längsrichtung des Ausgangswerkstücks, um eine Anzahl von geschnittenen Hülsen 54 zu erhalten. Vorteilhafterweise kann das die dritte Form aufweisende Ausgangswerkstück durch das Schneiden auf Länge der Soll-Hülse geschnitten werden. Entsprechend weist die hergestellte Hülse die Wandstärke, den Außendurchmesser und die Länge der Soll-Hülse auf.

Preferably, the sleeve shape that is still open in the longitudinal direction can be closed by connecting the two opposite edges. Preferably, the two opposite edges can be connected by a material bond, in particular welding, of the two opposite edges. Preferably, the method can further comprise:

• Cutting the starting workpiece having the third shape transversely to the longitudinal direction of the starting workpiece to obtain a number of cut sleeves 54. Advantageously, the starting workpiece having the third shape can be cut to the length of the target sleeve by the cutting. Accordingly, the sleeve produced has the wall thickness, the outer diameter and the length of the target sleeve.

• Prägen des Ausgangswerkstücks welches die dritte Form aufweist, um einen Hülsensockel 55 bereitzustellen (vgl. Fig. 3). Insbesondere können die durch den Schritt des Schneidens erhaltenen Hülsen 54 dem Prägen-Schritt unterzogen werden, um einen Hülsensockel 55 an den Hülsen 54 bereitzustellen. Der Hülsensockel 55 ist an einem Ende der Hülse 54 ausgebildet und ist radial nach außen gerichtet.

Preferably, the starting material can have a length which makes it possible to cut a plurality of sleeves, which have the length of the target sleeve, from the starting workpiece having the third shape. Advantageously, the manufacturing process for sleeves 54 can thus be designed efficiently. Preferably, the method can further comprise:

• Embossing the initial workpiece having the third shape to provide a sleeve base 55 (cf. Fig.3 In particular, the The sleeves 54 obtained by the cutting step are subjected to the stamping step to provide a sleeve base 55 on the sleeves 54. The sleeve base 55 is formed at one end of the sleeve 54 and is directed radially outward.

Furthermore, the second predetermined wall thickness can be in the range of 0.1 mm to 0.5 mm, preferably in the range of 0.2 mm to 0.4 mm, and particularly preferably approximately 0.3 mm.

Furthermore, the second predetermined outer diameter can be between 2.0 mm and 4.0 mm, preferably between 2.2 mm and 3.0 mm, and particularly preferably approximately 2.8 mm.

Furthermore, the length of a resulting sleeve 54 including the base can be between 9 mm and 12 mm, preferably between 9.5 mm and 11.5 mm, and particularly preferably approximately 9.75 mm.

The starting workpiece can preferably consist of an austenitic metal alloy, which is preferably non-magnetic. Furthermore, the metal alloy can have a chromium content of at least 8%, in particular of at least 18%. The chromium content is preferably approximately 18.27%. The metal alloy advantageously has no or only a low magnetic conductivity.

Preferably, the method may comprise:
Heat treatment of the initial workpiece.

Preferably, the heat treatment may be performed before the initial workpiece is machined or the manufactured sleeves 54 may be subjected to the heat treatment.

List of reference symbols

10

Connectors

12

Housing body

14

Connection housing

16

Main housing body section

18

Mounting base

20

Coaxial connectors

22

Socket side section of the connection housing

24

connector side section of the connection housing

26

Shape coding

28

Front of the mounting base

30

Narrow sides of the mounting base

31

Edge front/narrow side

32

Fuse features Socket

34

Fuse features connection housing

36

first housing body element

38

second housing body element

40

Passage openings mounting base

42

Internal contact

44

first contact section

46

second contact section

48

first dielectric insulation element

50

second dielectric insulation element

52

Stop surface

54

Sleeve

55

Sleeve base

56

Sleeve section first dielectric insulation element

58

Housing section first dielectric insulation element

59

Guide elements

60

first insulation element receiving space

62

second insulation element accommodation space

64

Bottom of housing body

66/68

graduated recording areas

70

Wall

72

Side walls first housing body element

74

Plug contacts

76

Support elements

78

Support surfaces

80

formable securing elements

82

Recesses

84

partition wall

86

Passage opening partition wall

88

Wall plug device side section

90

Wall mounting base section

92

ramp

94

Positioning advantage

96

Positioning opening

98

Recesses

100

Main pages

102

Top housing body

104

first pair of recesses

106

second pair of recesses

108

Back of housing body

110

coaxial socket end section

112

PCB-side end section

114

Sleeve stop

115

attack

116

Recesses

a

Depth first pair of recesses

b

Width of first pair of recesses

c

Length of first pair of recesses

d

Deep second pair of recesses

e

Wide second pair of recesses

e

Length of second pair of recesses

B

Total width of housing body

H

Distance bottom/top

T

Spacing between main pages

V

Connection direction

Z

Center axis

Claims (10)

1. A method for the production of a sleeve (54) for a coaxial plug-in connector (20), especially a mini-coaxial automotive connector, having the following steps of:

   - providing an initial workpiece for the production of the sleeve (54);

   - rolling the initial workpiece in order to provide a first form of the initial workpiece which has a predetermined material thickness and size;

   - reshaping the rolled initial workpiece which has the first form into a second form, wherein the second form is substantially sleeve-like and has a first predetermined wall thickness and a first predetermined outside diameter; and

   - drawing the initial workpiece which has the second form into a third sleeve-like form, wherein the third form has a second predetermined wall thickness and a second predetermined outside diameter, and wherein the second predetermined wall thickness and the second predetermined outside diameter correspond to the wall thickness and the outside diameter of a nominal sleeve, characterized in that

   - the initial workpiece and/or the first form have a substantially flat and rectangular form, and wherein the step of reshaping the rolled initial workpiece into the second form further comprises:

   - connecting two opposite edges of the initial workpiece to produce a sleeve form in order to provide the second form.
2. The method according to Claim 1, wherein the step of connecting the two opposite edges is carried out by connecting, in a firmly bonded manner, especially welding, the two opposite edges.
3. The method according to any one of the preceding claims, additionally having:

   - cutting the initial workpiece which has the third form transversely to the longitudinal direction of the initial workpiece in order to obtain a number of cut sleeves.
4. The method according to Claim 3, wherein the cutting is carried out by means of a laser or mechanically.
5. The method according to any one of the preceding claims, further having:

   - stamping the initial workpiece which has the third form in order to provide a base.
6. The method according to any one of the preceding claims, wherein the second predetermined wall thickness lies in the region of 0.1 mm to 0.5 mm, preferably in the region of 0.2 mm to 0.4 mm, and is particularly preferably approx. 0.3 mm.
7. The method according to any one of the preceding claims, wherein the second predetermined outside diameter is between 2.0 mm and 4.0 mm, is preferably between 2.2 mm and 3.0 mm, and is particularly preferably approx. 2.8 mm.
8. The method according to any one of the preceding claims, wherein the initial workpiece consists of an austenitic metal alloy which is preferably not magnetic.
9. The method according to Claim 8, wherein the metal alloy has a chromium proportion of at least 18%.
10. The method according to any one of the preceding claims, additionally having: heat treatment of the initial workpiece.

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