DE102017200558A1 - Composite component with at least two components and method for producing such a composite component - Google Patents

Abstract

The invention relates to a component assembly and a method for producing a component composite comprising at least two components that are connected to one another at at least one joint, wherein a first component (2) at the joint comprises a joining auxiliary element (4) and the joining auxiliary element (4). cohesively connected to the second component (3) or with a second component (3) provided in the second joining auxiliary element (9). In the first component (2), a through hole (7) is formed at the joint, wherein the through hole (7) is widened in a first edge region by a first indentation (8) which extends over more than 50% of the depth of the through hole (7). 7) and the joining auxiliary element (4) is pressed into the through hole (7) comprising the first indentation (8) in a form-fitting and / or non-positive manner.

Description

The invention relates to a composite component comprising at least two components and to a method for producing a component composite.

The increased use of lightweight materials in the vehicle industry leads to ever new manufacturing challenges. For decades, joining processes that are tailored to the use of steel materials can only be conditionally transferred to modern lightweight materials.

For example, nowadays, direct welding or soldering of components is not always possible, for example if material pairings of different metal materials, such as e.g. Aluminum and steel, or dissimilar materials, e.g. Metals and fiber composites to be joined.

The patent DE 100 15 713 A1 describes a component which is constructed of sheets which are not welded together. In order to be able to connect a first metal sheet of a light metal to another metal sheet, rivets, in particular solid rivets, are fastened in the first metal sheet at points which are fixed, which consist of a material which can be welded to the material of the further metal sheet.

The prior art will be hereinafter referred to as the patents DE 100 60 390 B4 . DE 10 2004 025 492 A1 and DE 10 2010 053 608 A1 specified.

The rivet or nail-type auxiliary joining elements used in the prior art are also referred to as resistance welding elements. The prior art is in addition to the patent DE 10 2012 010 870 A1 which shows a Schweißhilfsfügeteil in the form of a bolt.

From the not previously published document EN 10 2015 214 149.7 a method and a component composite is known in which in a first component, a through hole is introduced and in the through hole a sheet metal slug is pressed. The Blechbutzen serves as a Hilfsfügeelement to connect the first component with a second component. Between auxiliary joining element and the second component, a cohesive connection is formed.

Against this background, it is the object of the present invention to provide a possibility with which a comparison with the prior art improved component assembly can be made even with difficult material pairings

The object is achieved by a component assembly according to claim 1, and a method according to claim 13. Further advantageous embodiments will become apparent from the dependent claims and the description below.

It is specified a composite component comprising at least two components which are connected to each other at least one joint. According to the invention, a first component comprises a joining auxiliary element at the joint, and the joining auxiliary element is integrally connected to the second component or to a second joining auxiliary element provided in the second component. It is essential that in the first component at the joint, a through hole is formed, which is spread in a first edge region by a first circumferential indentation, which extends over more than 50% of the depth of the through hole. The joining auxiliary element is pressed positively and non-positively into the through hole comprising the first indentation.

Preferably, the first impression is introduced into an edge region of the first component, which faces away from the second component.

The through-hole may be e.g. be formed by cutting or punching and preferably has a closed hole or sectional contour. To the component surfaces, the through hole is bounded in each case by an edge region. The joining auxiliary element is connected to the first component in a form-fitting manner transversely to the joining axis. The hole geometry of the through hole and the outer geometry of the joining auxiliary element are at least partially matched accordingly.

The through-hole and / or the embossment may e.g. have a circular cross section or alternative cross sections. Thus, the introduction of an adhesive may be facilitated if the hole and / or embossing cross section, e.g. have a serrated or polygonal shape, or the through hole with embossment is designed crown-shaped.

In the area of the embossing, the hole cross section is enlarged, for example, the diameter of the through hole in the area of the embossment is increased. In the region of the impression, the joining auxiliary element has an undercut which secures the joining auxiliary element in one direction in a form-fitting manner against being pushed through the through-hole. Contrary to the assumption that the component thickness reduced in the area of the chamfer adversely affects the strength of the connection, it has been found that surprisingly high strengths can be achieved. The cause is assumed to be that this is due to the process of imprinting, whereby a material hardening in the edge region of the embossment is achieved, which is further increased in interaction with the subsequent pressing of the joining auxiliary element. Furthermore, it was found that the introduction of the impression also leads to a reduction of the hydrogen embrittlement and an edge crack sensitivity in this area can be counteracted. It has been found that the resulting component connection has surprisingly high strength values, in some cases strength values can be achieved which are above the strength of the base material of the first component.

It has proven to be particularly advantageous if, in one embodiment, the indentation is configured as a circumferential chamfer. In the region of the chamfer, the hole wall is inclined with respect to the longitudinal axis of the through-hole and the diameter of the through-hole increases continuously in the region of the chamfer towards the edge of the through-hole.

The cohesive connection exists between the joining auxiliary element and the second component or a second joining auxiliary element provided in the second component. The joint connection may e.g. be designed as a welded joint, solder joint and / or adhesive bond.

The joining auxiliary element is formed, for example, from a material that enables a material-locking connection with the second component. Preferably, the joining auxiliary element is formed from a metal material which has sufficient weldability or solderability with respect to the second component, for example of a steel or aluminum material. The joining auxiliary element may also be formed of a multilayer sheet material, such as a bimetallic material. The joining auxiliary element preferably has a cross-sectional area (transverse to the pressing force) of at least 20 mm ² or at least 50 mm ² or at least 1 cm ² before being pressed in.

The joining auxiliary element can be adapted to the geometry of the through hole with embossing and, e.g. a shaft which is pressed into the through hole and a head portion, which is preferably completely absorbed by the indentation. In one embodiment, a metal slug is preferably used as a joining auxiliary element. A metal stud is understood to mean a headless and unshaped metal plate which has been previously used e.g. by punching or cutting out of a sheet metal material or similar was generated. The metal slug may preferably have an approximately cylindrical shape before being pressed in, and e.g. additionally be provided with a circumferential bevel or faceting. For the metal scraps, a scrap piece may preferably be used or it may be made from a scrap piece.

Likewise, the joining auxiliary can be formed by a preformed element, e.g. in the manner of a threaded bushing or Helicoils be formed. With regard to reduced press-in forces, it may furthermore be advantageous if the joining auxiliary element is provided as a tubular element. By pressing in, the tube wall collapses and the material of the previously tubular element is deformed, e.g. can be compressed or flow, to achieve the desired force and / or positive connection in the component.

A particularly flat design of the component connection is possible if the joining auxiliary element is completely received on the side facing away from the second component from the through hole. The joining auxiliary element may advantageously be flush with the surface of the component or even set back relative to this. This is possible because it is not necessary because of the high achievable strengths of the component connection according to the invention in contrast to conventional Schweißhilfsfügeteilen that the joining auxiliary element is additionally supported with a head on the component surface.

On the side facing the second component, the joining auxiliary element may also be completely received by the through hole. However, to form the joint connection, it may also be advantageous if the joining auxiliary element protrudes on the side facing the second component with respect to the surface of the first component or has a protruding partial region. Thus, e.g. a defined distance between the two components can be set or a degassing gap can be ensured during the joining process.

The imprint may be formed on one side. Preferably, the embossment is formed circumferentially around the through hole in the entire edge region. In particular, the embossment can extend over more than 60% or more than 70% of the depth of the through hole. If the indentation is formed as a chamfer, then the hole wall in the region of the chamfer can e.g. be inclined at an angle to the longitudinal axis of the through hole, which is in a range of 30 to 60 degrees or in a range of 40 to 50 degrees, and in particular may be 45 degrees.

The fixation of the joining auxiliary element in the first component can be improved in one embodiment in that a second circumferential impression is formed on the second edge region of the through-hole, preferably as a second circumferential chamfer is formed. In this embodiment, the through-hole has two opposing embossments or bevels and the pressed-together joining auxiliary element is positively connected to the first component by an undercut on the first and second embossing or chamfer in the longitudinal direction of the through-hole and engages in the indentations or chamfers , In particular, the second indentation or bevel can extend so deeply into the component that it adjoins the first indentation or chamfer.

In one embodiment, the joining auxiliary element for producing the component composite is integrally bonded to the base material of the second component. For this purpose, it is particularly advantageous if the joining auxiliary element is formed from a material which is sufficiently cohesively pliable with the base material of the second component, preferably sufficiently weldable or solderable.

Alternatively, both components can also have a joining auxiliary element on the at least one joint, and the two joining auxiliary elements are joined together in a material-locking manner. In this case, the materials of the joining auxiliary elements are preferably selected so that the joining auxiliary elements are sufficiently good together material fit available, preferably are sufficiently weldable or solderable. The second joining auxiliary element can be designed like the first joining auxiliary element or differently.

If a joining auxiliary element (referred to as a second joining auxiliary element) is also provided on the at least one joint of the second component, then this joint is preferably designed as described for the first component, ie, preferably a through-hole (as the first component) in the second component second through hole), wherein the second through hole in a first edge portion facing away from the first member is broadened by a first indentation extending over more than 50% of the depth of the second through hole and the second joining auxiliary member into the first one Imprint comprehensive through hole is pressed form-fitting and non-positively. It may be advantageous if both the indentations in the first and in the second component are formed as chamfers.

In a preferred embodiment, the first and second components are made of a lightweight material, such as e.g. a light metal (e.g., aluminum, magnesium or their alloys) or a fiber composite plastic, and the first and second joining auxiliary members are formed of a steel material. Such a component composite makes it possible, in particular, to use already existing joining devices, such as e.g. Welding cells, also for joining two components made of lightweight materials continue to use.

Between the first joining auxiliary element and the first component and / or the second joining auxiliary element and the second component, in each case an intermediate layer element can be pressed in with it. The interlayer element may e.g. a film or layer of material that causes a galvanic separation between the joining auxiliary and the component.

The joining auxiliary element may additionally be connected to the intermediate layer element and / or the component into which it is pressed, in a materially bonded manner.

The component composite may have a single joint, but preferably the components are connected to each other at a plurality of joints. The multiple joints may be identical or different.

The component composite may further comprise a third or further components, which are also connected by means of the described method or by means of other known joining methods.

The first and second and optionally further components may be made of a sheet metal material (for example a steel sheet, aluminum sheet or magnesium sheet) or a sheet-like material, such as e.g. a fiber reinforced plastic material (e.g., carbon fiber, glass fiber or aramid fiber reinforced). In principle, it may also be a profile part, a casting or the like, which is formed like a sheet metal at the joint. The component connection described above is suitable for all material thicknesses, is suitable e.g. especially for material thicknesses in the range of 0.5 mm to 5 mm and in particular also for thin sheets or thin sheets with a thickness of 2.99 mm or less.

The component assembly is preferably a vehicle component and particularly preferably a body component, preferably a car body. It may also be e.g. also act as an interior component.

Furthermore, a method for producing a component composite is specified, which comprises at least a first and second component and a cohesive joint connection to at least one joint. The at least first and second components are connected to one another by the at least one joint. In the first component, a through-hole is produced at the at least one joint, and an indentation is formed such that the through-hole is widened at an edge region, wherein the indentation overlies extends more than 50% of the depth of the through hole. A joining auxiliary element is pressed into the through-hole with an embossing in a non-positive and positive manner. The first and second components are positioned and aligned relative to one another. A bonded joint connection is produced at the at least one joint by welding, soldering or gluing, wherein the joining auxiliary element is materially connected to the base material of the second component or with a second joining auxiliary element which is provided at the joint in the second component.

Preferably, the components are positioned to each other so that the first impression is remote from the second component.

The joining auxiliary element is materially connected in one embodiment with the base material of the second component. In an alternative embodiment, the joining auxiliary element is connected to a second joining auxiliary element, which is provided at the joint in the second component.

If a joining auxiliary element is also provided in the second component at the at least one joint, preferably a through hole is also produced in the second component at the at least one joint and likewise an embossing is formed such that the through hole is widened at an edge region, wherein the Imprint over more than 50% of the depth of the through hole extends. The second joining auxiliary element is pressed into the through hole in the second component and the first and second components are preferably positioned relative to each other to form the integral connection so that the embossment in the first component and the embossing in the second component are remote from each other.

The imprint is e.g. formed by embossing by means of a correspondingly shaped embossing tool. This can be done simultaneously with the creation of the through-hole or in a separate manufacturing step, e.g. before or after generating the through-hole. If the component with through-hole is a component made of a fiber-reinforced plastic (FRP), then the through-hole with the embossment can already be formed, for example, during the production of the FRP component. Also, such an embossing achieves the described solidification due to an increased fiber volume fraction in the edge region of the through-hole.

If the through-hole is formed in a metal component, then it may be advantageous in one embodiment if the stamping of the indentation or chamfer takes place prior to the formation of the through-hole. The embossing of the indentation or chamfer produces a notch in the metal component, wherein a possibly present component coating or oxide layer at the notched surfaces is at least partially retained.

In addition, when the joining auxiliary member is pressed into the component, an intermediate layer element, e.g. a film for preventing contact corrosion or an adhesive layer, are introduced between the joining auxiliary and the hole wall.

The pressing of the joining auxiliary element takes place e.g. with a suitable tool, e.g. a pressing tool or a C-clamp. For this purpose, the holding portion of the joining auxiliary member is inserted into the corresponding through hole and pressed there, wherein the material of the holding portion is permanently deformed and pressed against the hole wall frictionally. Furthermore, it can be provided in some embodiments that, moreover, the material of the holding section flows into the embossed or beveled region and forms an undercut there. The joining auxiliary element is thus fixed in the form of a component in the direction of the joining axis F.

Furthermore, it is possible to produce the through-hole and / or the embossing not in a separate step, but by the introduction of the joining auxiliary element itself. The through-hole may be e.g. can be generated by using a self-tapping joining element, e.g. by means of a rotary impact, is driven into the component.

With the method, the components can be connected in the manner of a prefixing and then additionally connected to each other by further joining methods. It is also possible that the component assembly is formed only by the method described above, wherein the components are preferably connected at a plurality of joints.

If, in addition, a further layer is introduced between the joining auxiliary element and the component (for example for electrochemical separation or an adhesive layer), a cohesive connection can additionally be achieved by the pressing and / or a heat treatment. The heat treatment can take place before, during or after the press-fitting process.

Likewise, by welding the joining auxiliary element to a further component, a cohesive connection between the joining auxiliary element and that component can be additionally produced in which the joining auxiliary element is pressed.

The method is used for the production of the component composite described above, so that the same technical effects and advantages are achieved, as described here.

• - Das Verfahren ermöglicht die kostengünstige und reproduzierbare Herstellung von Bauteilverbunden und Zusammenbauteilen, insbesondere in Mischbauweise.
• - Das Verfahren ermöglicht es, Bauteilverbunde mit Leichtbauwerkstoffen, wie z.B. Aluminium, in bestehenden Schweißanlagen und mit bestehenden Schweißprozesse fügen zu können, da z.B. durch den Einsatz von Fügehilfsteilen aus Stahl auch Aluminiumbauteile miteinander oder Aluminium- mit Stahlbauteilen in bestehenden Punktschweißanlagen gefügt werden können .
• - Eine erfindungsgemäße Fügeverbindung kann gegenüber bekannten Fügeverbindungen gewichtsneutral oder gewichtsvorteilig sein.
• - Eine erfindungsgemäße Fügeverbindung zeichnet sich durch eine hohe Festigkeit bei hoher Flexibilität der Gestaltung der Fügeverbindung aus.
• - Die erfindungsgemäße Fügeverbindung ist insbesondere für Dünnblechverbindungen geeignet.

The invention has, inter alia, the following advantages:

• - The method allows the cost-effective and reproducible production of component composites and components, especially in mixed construction.
• - The process makes it possible to add component composites with lightweight materials, such as aluminum, in existing welding systems and existing welding processes, since, for example, by the use of joint support parts made of steel aluminum components can be joined together or aluminum with steel components in existing spot welding systems.
• A joining compound according to the invention can be weight-neutral or weight-advantageous compared with known joining compounds.
• - A joining compound according to the invention is characterized by a high strength with high flexibility of the design of the joint connection.
• - The joint compound according to the invention is particularly suitable for thin sheet metal connections.

The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood with reference to the drawings and in conjunction with the following description of the embodiments. If the term "can" is used in this application, it is both the technical possibility and the actual technical implementation.

• 1: eine Schnittansicht eines beispielhaften Bauteilverbundes
• 2: eine Vorgehensweise zum Herstellen des Bauteilverbundes und
• 3 bis 8: Schnittansichten weiterer beispielhafter Bauteilverbunde.

Embodiments will be explained below with reference to the accompanying drawings. Therein show in a schematic representation:

• 1 : A sectional view of an exemplary component composite
• 2 : a procedure for producing the component composite and
• 3 to 8th : Sectional views of further exemplary component assemblies.

1 shows a sectional view of the joint of a component composite 1 , the two components 2 . 3 includes. The component composite 1 is produced by the method according to the invention. The component composite 1 may have a plurality of such joints, which may be identical or different.

The first component 2 is a sheet-metal component made of a lightweight material, such as aluminum or a fiber composite plastic. The term aluminum also includes the corresponding aluminum alloys. The second component 3 is a sheet steel component. The two components 2 . 3 are connected to each other at the joint, including a Joining auxiliary element 4 that in the first component 2 is pressed through a spot weld 6 cohesively with the base material of the second component 3 is added. The joining auxiliary element 4 is made of a steel material.

The welding was carried out by means of a conventional resistance spot welding process. Likewise, other welding methods are possible or elongated welds. As an alternative to welding, the joining auxiliary elements could also be joined together by a soldered joint or adhesive bond. Possibly. In addition, the components may be adhesively bonded elsewhere than the joint.

The first joining auxiliary element 4 is positively and positively pressed into the first component 2. The joining element 4 is completely in the first component 2 added. It does not rest on a surface of the first component 2 but is through an undercut 6 in the first component 2 also fixed in the direction of the joining axis F positive fit.

2 shows the first component 2 and the first joining auxiliary 4 before this in the first component 2 is pressed. The first joining auxiliary element 4 is formed as a metal slug with a substantially cylindrical shape. The joining auxiliary element 4 becomes a through hole 7 Pressed in the run in the first component 2 was generated, for example by cutting or punching. In the edge area of the hole 7 is an impression 8th formed in the form of an embossed chamfer, which is more than 50% and preferably more than 60% or more than 70% in the depth of the through hole 7 hineinerstreckt. The joining auxiliary element 4 is now in the through hole 7 pressed in, with the material of the joining auxiliary element 4 permanently deformed and received a positive connection with the hole wall. To the chamfer 8th also forms the undercut 6 out.

In a subsequent step, the second component is positioned to the first component and the weld joint 5 formed, including, for example, the joining auxiliary element 4 and the second component can be contacted with the electrodes of a resistance spot welding device.

While in the embodiment of 1 the joining auxiliary element 4 with the base material of the second component 3 is welded, in the second component, alternatively, a second joining auxiliary 9 be pressed in and the welded joint 6 be formed between the two joining auxiliary elements 4 and 9, see 3 , The second joining auxiliary element 9 can as well as the first Joining auxiliary element 4 be pressed into a through hole having a bevel in the form of a bevel, which is more than 50% and preferably more than 60% or more than 70% in the depth of the through hole and the thickness of the second component 3 hineinerstreckt. The undercuts formed on the indentations or chamfers 6 and 10 are preferably formed on the component surfaces facing away from each other. The pressing in of the second joining auxiliary element takes place as described above for the first joining auxiliary element 4 described.

The component composite 1 may also comprise more than two components. So show the 4 and 5 two exemplary embodiments in which three components are joined together. In this case, components can be joined together with and without joining auxiliary element.

In the component composite 4 is the first component 2 with his Joining auxiliary element 4 through the welded joint 5 with the second component 3 welded. Another third component 11 in the form of an aluminum sheet is by means of a further joining auxiliary element 12 in the form of a Stahlbutzens over a second welded joint 13 also welded to the second component. The further joining auxiliary element 12 is pressed into a through hole, in the edge region of an impression in the form of a circumferential chamfer over more than 50% of the component thickness is stamped, and has an undercut in the chamfer 14 on.

In another component composite according to 5 is in the second component 3 used a through hole with different bevel geometry. The pressed-in second joining auxiliary element 9 therefore has two symmetrical undercuts 15 . 16 on. The other component 17 in the form of a steel sheet is without Joining auxiliary element directly to the Joining auxiliary element 9 welded the second component.

In addition to the first impression or bevel 8th , which extends over more than 50% of the depth of the through hole or the component thickness, may be formed on the opposite edge region, a second embossment or chamfer. The pressed-in joining auxiliary element then forms two undercuts. The 6 and 7 show by way of example two corresponding component composites. In 6 the second chamfer is formed on the first component so that a non-chamfered region remains in the middle region of the hole wall. In 7 the second chamfer extends 18 until the first phase 8th approach.

The shape of the imprint is not on the in the 1 to 7 Limited bevel geometry limited, but modifications are possible, such as those in 8th shown dome-shaped impression 8A , Also, the joining auxiliary may already have a shape prior to pressing, which abuts the impression undercut, such as the in 8th shown cylindrical joining auxiliary element 4A with a widened head section 19 ,

The type of formation of the indentations or chamfers can be varied accordingly for the other components and the joining aids pressed therein.

The welded joints shown in the figures may also be formed as a solder or adhesive joint. Other materials and combinations may be used than shown in the figures. The shown distance between the components is not required. In the component assembly, the components can also rest directly on each other.

In contrast to conventional component connections with joining auxiliary elements, a significantly lower height of the component assembly can be achieved, since the joining auxiliary elements can terminate flush with the workpiece surfaces as required. Of course, it is possible to use the joining aids, e.g. projecting beyond the workpiece surface in the area of the joint, e.g. for the targeted formation of a spark.

Likewise, when the joining auxiliary element is pressed into the component, a protective layer (not shown), e.g. a foil for preventing contact corrosion, are introduced between the joining auxiliary element and the hole wall.

In the figures, for reasons of illustration, the course of the hole wall is shown as if the inclined hole wall merges directly into a vertical hole wall section in the region of the chamfer. In reality, however, a collar-shaped circumferential plateau may be formed between the inclined wall section and the vertical wall section, which is due to the geometry of the embossing punch.

Due to the embossed chamfer in the through hole and the pressed-in joining auxiliary element very high strengths are achieved. For example, in a trial in a sheet of a 6000 aluminum alloy (basic strength of 120 to 140 N / mm ² ) having a thickness of 1 mm, a through hole having a diameter of 12 mm was made in the core educated. At the margins, a chamfer was imprinted at an angle of 45 degrees with an embossing depth at the top of 0.8 mm and a plateau width at the bottom of 0.4 mm. A cylindrical sheet stock made of S355 having a thickness of 2 to 2.4 mm and a diameter before 11.7 mm was pressed into the through hole. After pressing, extraction forces for the slug arose from 3.5 to 4.1 kN (from above) and 0.3 to 0.6 kN (from below).

The embodiments are not to scale and are not restrictive. Modifications in the context of expert action are possible.

LIST OF REFERENCE NUMBERS

1

component composite

2, 3

components

4, 4A

Add auxiliary element

5

WeldingSpot

6

undercut

7

Through Hole

8, 8A

impressing

9

Add auxiliary element

10

undercut

11

component

12

Add auxiliary element

13

welded joint

14

undercut

15, 16

undercut

17

component

18

chamfer

19

header

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10015713 A1 [0004]
• DE 10060390 B4 [0005]
• DE 102004025492 A1 [0005]
• DE 102010053608 A1 [0005]
• DE 102012010870 A1 [0006]
• DE 102015214149 [0007]

Claims (14)

Partial composite comprising at least two components which are connected to each other at at least one joint, wherein a first component (2) at the joint an Fügehilfselement (4) and the Fügehilfselement (4) cohesively with the second component (3) or with a in the second component (3) provided second joining auxiliary element (9) is connected, characterized in that in the first component (2) at the joint a through hole (7) is formed, wherein the through hole (7) in a first edge region by a Embossment (8) is widened, which extends over more than 50% of the depth of the through hole (7) and wherein the joining auxiliary element (4) in the first embossment (8) comprising through hole (7) is positively and / or non-positively pressed. Component group after Claim 1 , characterized in that the impression (8) is formed as a chamfer. Composite component according to one of the preceding claims, characterized in that a metal slug is pressed in as a joining auxiliary element (4). Component assembly according to one of the preceding claims, characterized in that the joining auxiliary element (4) is completely received on the second component (3) facing away from the through hole (7). Component assembly according to one of the preceding claims, characterized in that on the second edge region of the through hole (7), a second impression, in particular a second chamfer, is formed, into which the joining auxiliary element (4) engages. Component assembly according to one of the preceding claims, characterized in that the joining auxiliary element (4) is integrally connected to the base material of the second component (3). Component assembly according to one of the preceding claims, characterized in that in the second component (3) at the joint a second joining auxiliary element (9) is provided and the first joining auxiliary element (4) and the second joining auxiliary element (9) are integrally connected to each other, wherein in the second component (3) has a second through-hole formed at the joint, wherein the second through-hole is widened in a first edge region by a first indentation that extends over more than 50% of the depth of the second through-hole and the second joining auxiliary element (9) in which the first impression comprehensive second through hole is positively and positively pressed. Component group after Claim 7 in which the first and second components (2, 3) are made of a lightweight material and the first and second joining auxiliary elements (4, 9) are made of a steel material. Component assembly according to one of the preceding claims, characterized in that between the first joining auxiliary element (4) and the first component (2) and / or the second joining auxiliary element (9) and the second component (3) in each case an intermediate layer element is pressed with. Component assembly according to one of the preceding claims, characterized in that the indentations (8) are formed in the first and in the second component as chamfers. Component assembly according to one of the preceding claims, characterized in that the joining auxiliary element (4) with the intermediate layer element and / or the component (2), in which it is pressed, is additionally bonded cohesively. Component assembly according to one of the preceding claims, which is part of a vehicle body. Process for producing a composite component according to one of Claims 1 to 12 comprising at least one first and second component and a material-fit joint at at least one joint, comprising the steps of: creating a through-hole (7) on the at least one joint in a first component (2), forming an indentation (8) such that the through-hole (7) is broadened in an edge region, and the indentation extends over more than 50% of the depth of the through-hole, non-positive and / or positive press-fitting of a joining auxiliary element (4) into the through-hole (7) with indentation (8), positioning and aligning the first and second component (2, 3) relative to one another and producing the integral joint connection (5) at the at least one joint by welding, soldering or gluing, wherein the joining auxiliary element (4) is materially bonded to the base material of the second component (3) is connected or with a second joining auxiliary element (9) provided at the joint in the second component (3) is. Method according to Claim 13 , in which a through-hole is produced in the second component (3) at the at least one joint, and an indentation is formed such that the through-hole is widened in an edge region and the embossment extends from a hole edge to more than 50% into the depth of the through-hole, a second joining auxiliary element (9) is pressed into the through hole in the second component (3) and the first and second components (2, 3) are positioned relative to one another such that the impression (8) in the first component (2) and the impression in the second Component (3) facing away from each other.

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