Functional element, assembled component and method for producing an assembled component

Abstract

A functional element for pressing into a workpiece, in particular a sheet metal part, comprises a functional section and a fastening section with a stop surface for introducing a pressing force into the functional element, a workpiece contact surface opposite the stop surface which can be brought into contact with the workpiece and which is in particular flange-like in design, and a sealing area located in an axial and / or a radial direction of the functional element between the workpiece contact surface and the functional section for receiving displaced material of the workpiece, which forms a contact surface for the displaced material in order to seal a connection between the functional element and the workpiece, wherein the fastening section has a projection.which limits the sealing area in the axial direction and which has a first flank facing the sealing area and a second flank facing away from the sealing area, which run obliquely and are inclined to different degrees to the axial direction, wherein the first flank is inclined more strongly to the axial direction than the second flank, and wherein the second flank is inclined at approximately 15° to approximately 35° to the axial direction.

Description

[0001] The invention relates to a functional element for pressing into a workpiece, in particular into a sheet metal part, an assembly part comprising a workpiece with a hole, in particular a sheet metal part, and such a functional element, as well as a method for producing the assembly part.

[0002] Such elements typically have a functional section that serves to attach additional components. They are widely used in automotive engineering, among other areas.

[0003] Functional elements can be bolt elements, the shaft of which can be provided with a thread, or nut elements, which, for example, have an internal thread.

[0004] Functional elements are known in various designs. On the one hand, there are, for example, rivet elements that have a rivet section that is deformed when attached to a sheet metal part to form a rivet flange and, together with the head portion, to form an annular receptacle for the edge of a hole in the sheet metal part. With such rivet elements, the functional element is deformed when attached to the sheet metal part. Furthermore, press-in elements are known in which the element itself is not intentionally deformed when attached to a sheet metal part, but rather the sheet metal material itself is deformed to engage it with undercuts of the respective press-in element.

[0005] To seal connections between functional elements and workpieces, especially sheet metal parts, a special coating is typically applied to parts of the functional elements that contact the workpiece. This application takes place in a separate manufacturing step, resulting in increased complexity and thus higher costs and time. Furthermore, this solution results in increased environmental impact due to the coating.

[0006] It is an object of the present invention to provide a functional element and an assembly part with which a tight connection can be achieved with relatively little effort and a reduced environmental impact compared to previously known solutions.

[0007] This problem is solved by the subject matter of the independent claims. Advantageous embodiments are the subject matter of the dependent claims.

[0008] A functional element according to a first aspect of the invention is suitable for being pressed into a workpiece, in particular into a sheet metal part, and comprises a functional section and a fastening section with a stop surface for introducing a press-in force into the functional element, a workpiece contact surface opposite the stop surface, which can be brought into contact with the workpiece and which is in particular designed like a flange, and a sealing region lying in an axial direction and / or a radial direction of the functional element between the workpiece contact surface and the functional section for receiving displaced material of the workpiece.The sealing region forms a contact surface for the displaced material in order to seal a connection between the functional element and the workpiece, wherein the contact surface has a first partial surface which runs obliquely to the axial direction of the functional element and which converges as seen in a press-in direction of the functional element, and a second partial surface which adjoins the first partial surface, runs obliquely to the axial direction of the functional element and diverges as seen in the press-in direction of the functional element.

[0009] The second sub-area is directly or indirectly connected to the first sub-area.

[0010] The converging first partial surface and the diverging second partial surface, which adjoins the first partial surface, form the contact surface, which is designed in such a way that the displaced material of the workpiece can be optimally pressed against the contact surface in order to achieve a high level of tightness.

[0011] In particular, the functional element can be a press-in stud, in particular a press-in stud with a flange, or a nut element, which are preferably used in ductile sheet metal parts to facilitate the press-in process. In this case, the shaft of the press-in stud preferably has an external thread and forms the functional section. The nut element, on the other hand, preferably has an internal thread, which forms the functional section. Instead of the thread, other features can also be provided which are suitable, for example, for fastening another component or for providing another functionality. The functional section can also be formed partially or completely as a smooth pin or as a smooth hole. The fastening section is the section of the functional element with which the functional element is fastened to the workpiece.

[0012] The press-in direction refers to the direction in which the functional element is pressed into the sheet metal part. The press-in direction can, in particular, run in the axial direction of the functional element, preferably from the stop surface toward the workpiece contact surface. For the purpose of effective force introduction, the stop surface and / or the workpiece contact surface preferably extend approximately perpendicular to the press-in direction.

[0013] Preferably, the functional section and the fastening section are formed as a single piece. The functional element and / or the workpiece can be made of metal. However, the inventive concept can also be implemented with elements and / or workpieces made of other materials.

[0014] In principle, the functional element can be designed to be self-punching. Advantageous embodiments are specified in the claims, the description and the attached drawings.

[0015] Preferably, the first partial surface is inclined by approximately 20° to approximately 40°, in particular approximately 30°, relative to the axial direction. As a result, the first partial surface has a relatively slight inclination relative to the axial direction, so that the material of the workpiece can be pressed tightly against the first partial surface.

[0016] In a preferred embodiment, the second partial surface is inclined approximately 50° to approximately 70°, in particular approximately 60°, relative to the axial direction. As a result, the second partial surface is relatively steeply inclined relative to the axial direction, allowing the second partial surface to form an undercut in addition to its sealing function. The functional element is thus securely held in or on the workpiece.

[0017] In particular, the first partial surface and the second partial surface can run approximately at right angles to each other.

[0018] Conveniently, the first partial surface and / or the second partial surface can be conical in shape, so that they each form a surface against which the material of the workpiece can be tightly pressed.

[0019] Preferably, the first partial surface is connected to the second partial surface by a rounded transition region to prevent cavities at the transition from the first partial surface to the second partial surface and resulting leaks. A radius of curvature of the transition region can, in particular, be in the range of approximately 0.5 mm or less, in particular approximately 0.25 mm to 0.35 mm.

[0020] A functional element according to a further aspect of the invention is suitable for pressing into a workpiece, in particular into a sheet metal part, and comprises a functional section and a fastening section with a stop surface for introducing a press-in force into the functional element, a workpiece contact surface opposite the stop surface, which can be brought into contact with the workpiece and is in particular designed like a flange, and a sealing area lying in an axial direction and / or a radial direction of the functional element between the workpiece contact surface and the functional section for receiving displaced material of the workpiece.The sealing area forms a contact surface for the displaced material in order to seal a connection between the functional element and the workpiece, wherein the fastening section has a projection which delimits the sealing area in the axial direction and which has a first flank facing the sealing area and a second flank facing away from the sealing area, which run obliquely and with different degrees of inclination to the axial direction.

[0021] The projection can be provided, in particular, circumferentially on the shaft of a functional element configured as a bolt element and can also be referred to as a lip. The projection preferably protrudes radially outward and comprises at least the first flank and the second flank. In particular, the first flank can form at least part of the contact surface, in particular the second partial surface.

[0022] The projection creates an undercut that closes off the sealing area and securely holds the functional element in the workpiece. The displaced material of the workpiece can thus be enclosed in the axial direction between the workpiece contact surface or contact surface on the one hand and the projection on the other. At the same time, the projection, especially the first flank, can also form part of the contact surface to achieve a high sealing effect.

[0023] Preferably, the first flank is more inclined toward the axial direction than the second flank. This improves the effect of the undercut, i.e., the retention of the functional element in the workpiece, and facilitates the insertion of the functional element when pressing it into the workpiece in the direction in which the second flank protrudes.

[0024] In particular, the first flank may be inclined by approximately 50° to approximately 70°, in particular approximately 60°, to the axial direction.

[0025] In a preferred embodiment, the second flank is inclined approximately 15° to approximately 35°, in particular approximately 25°, to the axial direction.

[0026] The first flank and the second flank can expediently be connected to one another by a connecting section in which the projection has a constant diameter, so that the design of the projection can be adapted to the conditions, in particular to the sheet thickness of the workpiece, without impairing the function of the flanks. In this embodiment, the connecting section thus runs in the axial direction. Preferably, the connecting section can extend over approximately 20% to approximately 70%, in particular approximately 40%, of the axial extent of the projection.

[0027] In particular, the fastening section, e.g., the workpiece contact surface, has at least one anti-rotation feature. Preferably, a plurality of anti-rotation features are provided, which are arranged, for example, evenly distributed in the axial direction and / or circumferential direction. The anti-rotation features can ensure that a connection between the functional element and the workpiece withstands a torque load subsequently introduced via the functional section. The anti-rotation features can be arranged in a recess or a circumferential groove of the fastening section, in particular a head of the functional element, which comprises the stop surface and / or the workpiece contact surface.

[0028] The anti-rotation features can be formed as radially and / or axially extending ribs or grooves. In particular, the anti-rotation features are uniformly arranged and extend at equal angular intervals from one another in the radial direction.

[0029] The workpiece contact surface can have a recess, in particular an annular recess, wherein the first partial surface can extend into the recess and / or merge into it.

[0030] According to one embodiment, the workpiece contact surface has a raised portion—in addition to or as an alternative to the recess. The raised portion can be wedge-shaped, at least in sections, when viewed in cross-section. The wedge shape preferably slopes downwards toward the first partial surface. The first partial surface can merge into the raised portion.

[0031] One function of the elevation can be to support the displacement of material from the workpiece into the sealing area when the element interacts with the workpiece.

[0032] The anti-rotation features - if present - can be arranged in the recess and / or on the elevation.

[0033] The recess can in particular be directed opposite to a pressing-in direction of the functional element, so that the material of the workpiece is at least partially displaced into the recess when pressed in and is pressed there in particular against the first partial surface of the contact surface.

[0034] In an advantageous embodiment, the workpiece contact surface merges into the first partial surface.

[0035] The invention further relates to an assembly component comprising a workpiece, in particular a sheet metal part, wherein a functional element according to at least one of the above-described embodiments is pressed into a hole prefabricated in the workpiece or into a hole punched by the functional element. The functional element according to the invention is pressed into the hole in such a way that material of the workpiece displaced by the pressing or after the pressing is received in the sealing region and lies tightly against the contact surface.

[0036] In particular, the displaced material of the workpiece rests against the projection or encloses the projection at least partially or completely.

[0037] A thickness of the workpiece may be less than or substantially equal to an axial extension of the sealing area, at least in the area of ​​the hole.

[0038] Alternatively, a thickness of the workpiece, at least in the area of ​​the hole, may also be greater than or substantially equal to an axial extension of the sealing area.

[0039] According to a further aspect, the invention further relates to a method for producing an assembly part according to the invention, which comprises the following steps: Providing a functional element according to the invention, providing a workpiece, in particular a sheet metal part, and inserting the functional element into a prefabricated hole in the workpiece or into a hole punched through the functional element and introducing a press-in force into the stop surface so that the workpiece contact surface is brought into contact with the workpiece, and displacing material of the workpiece into the sealing area so that the material is pressed against the contact surface in order to create a tight connection between the functional element and the workpiece.

[0040] According to one embodiment, the functional element is self-punching, so that pre-punching of the workpiece is unnecessary.

[0041] The material can be displaced by pressing a die against a surface of the workpiece facing away from the workpiece contact surface. The die is designed to displace the workpiece material into the sealing area, so that the material is pressed against the contact surface to create a tight connection between the functional element and the workpiece.

[0042] In particular, during this process, the workpiece rests on a support that includes a suitable die. The applied press-in force then also serves to displace the material. However, it is also possible to press the die against the surface of the workpiece facing away from the workpiece contact surface during or after the insertion of the functional element into the hole and / or the introduction of the press-in force in order to displace material from the workpiece.

[0043] The displacement of the workpiece material can also be caused by components of the head of the element during pressing.

[0044] The invention will be explained below purely by way of example with reference to advantageous embodiments. The drawings, which schematically illustrate the embodiments, show: Fig. 1 a perspective view of a functional element designed as a press-in bolt according to an embodiment, Fig. 2 a further perspective view of the functional element from Fig. 1 , Fig. 3a a half section of the functional element from Fig. 1 , Fig. 3b Detailed view of area A according to Fig. 3a , Fig. 4 a detailed view of a sealing area of ​​a functional element designed as a press-in bolt according to a further embodiment, Fig. 5 a detailed view of a sealing area of ​​a functional element designed as a press-in bolt according to a further embodiment, Fig. 6a a half-section of an assembly part according to an embodiment with a press-in bolt as a functional element, Fig. 6b a detailed view of the area B according to Fig. 6a , Fig. 7a a half section of an assembly part according to a further embodiment with a press-in bolt as a functional element, Fig. 7b a detailed view of the area C according to Fig. 7a , Fig. 8a a half section of an assembly part according to a further embodiment with a press-in bolt as a functional element, Fig. 8b a detailed view of the area D according to Fig. 8a , Fig. 9 a perspective view of a functional element designed as a nut element according to an embodiment, Fig. 10 a further perspective view of the functional element from Fig. 9 , Fig. 11a a half section of the functional element from Fig. 9 , Fig. 11b a detailed view of the area E according to Fig. 11a , Fig. 12a a half section of an assembly part according to an embodiment with a nut element as a functional element and Fig. 12b a detailed view of the area F according to Fig. 12a .

[0045] Out of Fig. 1 und 2 a functional element 10 designed as a press-in bolt with a flange is visible, and Fig. 9 und 10 show a functional element 10 designed as a nut element, which has a functional section 11 and a fastening section 13. The fastening section 13 is the section of the functional element 10 with which the functional element 10 is fastened to a workpiece 50, which will be described in more detail later. The functional elements 10 each have a head 43. The functional element 10 designed as a press-in bolt according to Fig. 1 und 2 also has a shaft 41 on which a thread 45 (external thread) is formed. On the functional element 10 designed as a nut element, an internal thread 45 (see Fig. 11a ) is provided.

[0046] The respective head 43 has a stop surface 15 for introducing a press-in force into the functional element 10 and a flange-like workpiece contact surface 17 opposite the stop surface 15. In an axial direction and / or radial direction of the functional element 10, a sealing area 19 is located between the workpiece contact surface 17 and the functional section 11. The sealing area has a contact surface 21 for displaced material of the workpiece 50 in order to seal a connection between the functional element 10 and the workpiece 50.

[0047] The shaft 41 of element 10 of the Fig. 1 und 2 extends from the side facing away from the stop surface 15. However, it is also possible to arrange the shaft on the stop surface 15 (this would then be annular for a shaft with a round cross-section). With an otherwise unchanged design of the fastening section 13, the sealing area 19 then also lies between the workpiece contact surface 17 and the functional section 11 in an axial view.

[0048] The design of the contact surface 21 is clearly shown in Fig. 3a bis Fig. 5 This comprises a conical first partial surface 23, which runs obliquely to the axial direction of the functional element 10 and converges when viewed in a press-in direction E of the functional element 10, and a conical second partial surface 25, which, viewed in the press-in direction E, lies between the first partial surface 23 and the functional section 11, which adjoins the first partial surface 23 by means of a rounded transition region 27, also runs obliquely to the axial direction of the functional element 10 and diverges when viewed in the press-in direction E of the functional element 10. Specifically, the first partial surface 23 can be inclined by approximately 20° to approximately 40°, in particular approximately 30°, to the axial direction, and the second partial surface 25 can be inclined by approximately 50° to approximately 70°, in particular approximately 60°, to the axial direction. As can be seen, for example, from Fig. 3b and Fig. 4 As can be seen, the two partial surfaces 23, 25 can be approximately perpendicular to each other. Alternatively, the angle between the partial surfaces 23, 25 can be Fig. 5 shown, can also be larger than 90°, up to about 135°.

[0049] As the example in Fig. 11a bis 12b clearly shows, the contact surface 21 of the functional element 10 designed as a nut element also comprises a first partial surface 23 and a conical second partial surface 25, which adjoins the first partial surface 23 by means of a rounded transition region 27, runs obliquely to the axial direction of the functional element 10 and diverges when viewed in the press-in direction E of the functional element 10. The first partial surface 23 in the present example runs approximately parallel to the press-in direction E, but the functional element 10 can also be designed such that the first partial surface 23 runs obliquely to the axial direction and converges when viewed in the press-in direction E, as in Fig. 11b indicated by dashed lines.

[0050] The press-in direction E denotes the direction in which the functional element 10 is pressed into the sheet metal part 50 as intended. The press-in direction E runs parallel to the axial direction of the functional element 10 from the stop surface 15 toward the workpiece contact surface 17, wherein the stop surface 15 and the workpiece contact surface 17 run approximately perpendicular to the press-in direction E.

[0051] The contact surface 21, namely the first partial surface 23, extends into a (ring) recess 39 of the elements 10 made in the head 43 according to the Fig. 1 bis 8b and there merges into the workpiece contact surface 17. Several radially extending ribs are formed in the recess 39 as anti-rotation features 37. Furthermore, the recess 39 is directed opposite to the press-in direction E of the functional element 10, so that material of the workpiece 50 can be at least partially displaced during pressing into the recess 39 and thereby conforms to the first partial surface 23.

[0052] Element 10 according to the Fig. 9 bis 11b does not have this recess 39. Instead, a wedge-shaped elevation 40 is provided, which slopes radially inward and merges into the first partial surface 23 via a rounded transition section 28. In the illustrated embodiment, the surface 23 has anti-rotation features 37 in the form of axial ribs evenly distributed in the circumferential direction. The elevation also preferably has anti-rotation features 37, here, for example, radial grooves evenly distributed in the circumferential direction.

[0053] The recess 39 and the elevation 40 described above can be combined if required - even in a modified form - and can be implemented in both a nut element and a bolt element.

[0054] The fastening section 13 also comprises a circumferentially radially outwardly extending projection 29, which delimits the sealing region 19 in the axial direction. The projection 29 has a first flank 31 facing the sealing region 19, on which the second partial surface 25 of the contact surface 21 is formed, and a second flank 33 facing away from the sealing region 19. The projection 29 of the functional element 10, designed as a press-in bolt, also has, unlike the nut element, an optional connecting section 35 that connects the two flanks 31, 33 to one another. The diameter of the projection 29 varies along its axial extent and, viewed in the press-in direction E, increases in the region of the first flank 31, remains constant in the region of the connecting section 35, and decreases in the region of the second flank 33. The flanks 31, 33 accordingly run obliquely to the axial direction of the functional element 10.

[0055] As in particular Fig. 4 shows, the first flank 31 can be inclined more strongly to the axial direction than the second flank 33. This results, on the one hand, in a particularly effective design of the contact surface 21 and an effective undercut by the projection 29. On the other hand, a comparatively small adjustment or inclination of the second flank 33 facilitates the introduction of the projection 29 into the shaped hole.

[0056] Alternatively, the projection 29 can be designed approximately symmetrically, resulting in an equal inclination of the flanks 31, 33 to the axial direction (see for example Fig. 3b ), or the first flank 31 may be less inclined to the axial direction than the second flank 33, as for example in Fig. 5 shown. Specifically, the first flank 31 can advantageously be inclined approximately 50° to approximately 70°, in particular approximately 60°, to the axial direction, and the second flank 33 can be inclined approximately 15° to approximately 35°, in particular approximately 25°, to the axial direction.

[0057] The interaction of the functional element 10 with the workpiece 50 is particularly clear from Fig. 6a bis Fig. 8b and Fig. 12a und 12b , each showing an assembly part 100 according to the present invention. As shown, the workpiece 50 is designed, for example, as a sheet metal part with preferably ductile properties. The workpiece 50 has a surface 51, against which the workpiece contact surface 17 of the functional element 10 rests, and a surface 53 on an opposite side of the workpiece 50. The Fig. 6a, 6b , 7a, 7b The workpiece 50 shown in Figures 8a and 8b, respectively, has increasing thicknesses T 50 in order to illustrate that the inventive concept can be used for workpieces with a wide variety of properties.

[0058] The functional element 10 is pressed into a shaped hole provided in the workpiece 50, for example a bore or a pre-punched hole, so that displaced material of the workpiece 50 is received in the sealing area 19 and - if present - in the recess 39 and lies tightly against the contact surface 21. This is simplified by the oblique arrangement of the first partial surface 23, since the material does not have to be pressed as deeply into the sealing area 19 in order to come into contact with it. The displaced material of the workpiece 50, depending on the thickness T 50 of the workpiece 50, lies against the projection 29 ( Fig. 6b , Fig. 8b , Fig. 12b ) or even encloses it completely ( Fig. 7b ). The functional element 10 according to the invention thus enables the production of excellently sealed assembly parts 100, regardless of the thickness T 50 of the respective workpiece 50.

[0059] For the production of Fig. 6a bis Fig. 7b The assembly parts 100 shown can be assembled in particular as follows: First, a functional element 10 according to the invention and a workpiece 50, in particular a sheet metal part, into which a shaped hole is made, are provided. The functional element 10 is then inserted into the shaped hole so that the workpiece contact surface 17 faces the surface 51.

[0060] In this case, a press-in force is introduced into the stop surface 15, which causes the workpiece contact surface 17 to be brought into contact with the workpiece 50. This press-in force can be used to force material of the workpiece 50 into the sealing area 19 and to press it against the contact surface 21. For this purpose, a die (not shown in the figures) can be provided on the surface 53 facing away from the workpiece contact surface 17. The press-in force presses a punch of the die into the surface 53, whereby an annular groove 55 is formed in an area of ​​the workpiece 50 adjacent to the hole. Pressing the punch of the die into the workpiece 50 in an area adjacent to the hole thus displaces material of the workpiece 50, which flows into the sealing area 19 and thereby conforms to the contact surface 21.

[0061] In principle, it is also conceivable to first introduce the element 10 into the workpiece 50 and to effect the step of displacing the material by means of the die in a separate and / or subsequent step.

[0062] In the assembly part 100 of the Fig. 8a, 8ab The displacement of the material is not effected by a die with a punch, but rather the surface 53 of the workpiece 50 rests on a support surface that is essentially flat in the area around the hole. The displacement of the material is effected here by partially pressing the head 43 into the surface 51. Due to the flat support surface, the material cannot escape downward and is therefore forced into the sealing area 19 until it lies flat against the first partial surface 23 and thus forms a tight seal.

[0063] In the assembly part 100 according to the Fig. 12a, 12ab The displacement of the material is effected by the protrusion 40. The head 43 is not pressed into the workpiece 50, but rather only against its surface 51 until the workpiece contact surface 17 rests against it. In doing so, the protrusion 40 penetrates the workpiece 50. Its radially inwardly sloping wedge shape supports a directed displacement of the material into the sealing area 19.

[0064] It is understood that the material displacement concepts described above can be combined if appropriate for the particular application.

[0065] The exemplary embodiments shown and described here have in common that they provide a functional element or an assembly component that enables a tight connection of an assembly component with minimal effort and without the need for additional sealing means. By appropriately selecting the design, in particular the spatial arrangement, extension and / or inclination, of the first and second partial surfaces, the first and second flanks, the transition section, and / or the connecting section, the functional element can be adapted to the respective prevailing conditions.

[0066] The above embodiments refer to functional elements that can be inserted into pre-punched workpieces. However, these elements can also be self-punching, particularly nut elements or bolt elements whose shank extends from the stop surface. For this purpose, their fastening section can be provided with a punching edge facing the workpiece. Bezugszeichenliste

[0067] 10Functional element 11Functional section 13Fastening section 15Stop surface 17Workpiece contact surface 19Sealing area 21Contact surface 23First partial surface 25Second partial surface 27Transition area 29Protrusion 28Transition section 31First flank 33Second flank 35Connecting section 37Anti-rotation feature 39Recess 40Elevation 41Shaft 43Head 45Thread 50Workpiece 51Surface 53Surface 55Ring groove 100Assembly part EPressing direction T 50 Thickness of the workpiece

Claims

1. A functional element (10) for pressing into a workpiece (50), in particular into a sheet metal part, comprising a functional section (11) and a fastening section (13) with a stop surface (15) for introducing a press-in force into the functional element (10), a workpiece contact surface (17) opposite the stop surface (15), which can be brought into contact with the workpiece (50) and which is in particular designed like a flange, and a sealing region (19) located in an axial direction and / or radial direction of the functional element (10) between the workpiece contact surface (17) and the functional section (11) for receiving displaced material of the workpiece (50), which sealing region forms a contact surface (21) for the displaced material in order to seal a connection between the functional element (10) and the workpiece (50), wherein the fastening section (13) has a projection (29),which delimits the sealing region (19) in the axial direction and which has a first flank (31) facing the sealing region (19) and a second flank (33) facing away from the sealing region (19), which run obliquely and at different inclinations to the axial direction, wherein the first flank (31) is more inclined to the axial direction than the second flank (33), and wherein the second flank (33) is inclined by approximately 15° to approximately 35° to the axial direction.

2. Functional element (10) according to claim 1, characterized in that the second flank (33) is inclined by approximately 25° to the axial direction.

3. Functional element (10) according to claim 1 or 2, characterized in that the first flank (31) is inclined by approximately 50° to approximately 70°, in particular approximately 60°, to the axial direction.

4. Functional element (10) according to one of claims 1 to 3, characterized in thatthe first flank (31) and the second flank (33) are connected to one another by a connecting section (35) in which the projection (29) has a constant diameter.

5. Functional element (10) according to one of claims 1 to 4, characterized in that the first flank (31) forms at least part of the contact surface (21).

6. Functional element (10) according to one of claims 1 to 5, characterized in that the workpiece contact surface (17) has a recess (39), in particular a ring recess.

7. Functional element (10) according to claim 6, characterized in that the first partial surface (23) extends into the recess (39).

8. Functional element (10) according to one of claims 1 to 7, characterized in that the workpiece contact surface (17) has a raised portion (40).

9. Functional element (10) according to claim 8, characterized in that the elevation (40) is wedge-shaped at least in sections when viewed in cross-section.

10. Functional element (10) according to claim 8 or 9, characterized in that the first partial area (23) merges into the elevation (40).

11. Functional element (10) according to one of claims 1 to 10, characterized in that the workpiece contact surface (17) merges into the first partial surface (23).

12. Assembly part (100) comprising a workpiece (50), in particular a sheet metal part, and a functional element (10) according to one of claims 1 to 11, wherein the functional element (10) is pressed into a hole prefabricated in the workpiece or a hole punched through the functional element (10), so that material of the workpiece (50) displaced by the pressing in or after the pressing in is received in the sealing region (19) and lies tightly against the contact surface (21).

13. Assembly part according to claim 12, characterized in that the displaced material of the workpiece (50) rests against the projection (29) or at least partially or completely encloses the projection (29).

14. Assembly part according to claim 12 or 13, characterized in that a thickness (T 50 ) of the workpiece (50) is smaller or substantially equal to an axial extent of the sealing region (19) at least in the region of the hole or the thickness (T 50 ) of the workpiece (50) is greater than or substantially equal to an axial extension of the sealing region (19) at least in the region of the hole.

15. A method for producing an assembly part (100) according to one of claims 12 to 14, comprising the steps of: - providing a functional element (10) according to one of claims 1 to 11, - providing a workpiece (50), in particular a sheet metal part, and - inserting the functional element (10) into a prefabricated hole in the workpiece or into a hole punched through the functional element (10) and introducing a press-in force into the stop surface (15) so that the workpiece contact surface (17) is brought into contact with the workpiece (50), and - displacing material of the workpiece (50) into the sealing region (19) so that the material is pressed against the contact surface (21) in order to produce a tight connection between the functional element (10) and the workpiece (50).