Self-piercing metal fastening sleeve, first component with the fastening sleeve, connecting structure with the first component, and setting method for the fastening sleeve

Description

1. Field of the invention

[0001] The present invention relates to a self-punching metallic fastening sleeve adapted to form an opening reinforcement in a metallic component, preferably a high-strength metallic component, a first component with the fastening sleeve, a connecting structure consisting of the first component with the fastening sleeve and a second component, and a setting method for the fastening sleeve. 2. Background of the invention

[0002] Various fastening sleeves are known in the prior art that are attached to pre-drilled component openings. These fastening sleeves are designed so that they are inserted into component openings, for example as opening reinforcement, without the need for punching.

[0003] An example of such a fastening sleeve is found in US 5,513,933 A. The self-clamping fastener described therein can be connected to a section of sheet metal in which an opening is formed to receive the fastener. The self-clamping fastener comprises a head section and a shank section, which has a smaller outside diameter than the head section and extends axially from one side of the head section. A displacement section extends axially from one side of the head section and radially outward from the shank section. Within the displacement section, an undercut annular groove is formed, which extends axially toward the head section and radially surrounds the shank section.A generally annular calibration ring is formed around the shaft section and has an axial distance from one side of the head section that is slightly greater than the axial extent of the displacement section. The outer diameter of the calibration ring is larger than the outer diameter of the shaft section and also larger than the inner diameter of the undercut annular groove.

[0004] Instead of a fastening sleeve, WO2022 / 123805 A1 deals with the provision of a stud bolt that can improve quality when attached to a plate to be fastened. The stud bolt is permanently and rotationally fixed to the plate to be fastened, comprising a head, a shank, an anti-rotation stop, an annular groove, and an annular projection. The stud bolt is configured such that the plate to be fastened is clamped between a seating surface of the head and the annular projection, and has a notched portion in the anti-rotation stop that faces upwards in the screwing direction.

[0005] A connection comprising two workpieces, each with an opening defined by an inner wall, is described in EP 0 856 670 A1. A fastening element is located at least in the opening through the first workpiece. The fastening element has a shaft section. The first section has a projection extending outwards from an underside of the first section. The shaft section has a retaining groove. The fastening element is prevented from axially moving relative to the first workpiece after the material of the first workpiece has flowed into the retaining groove. The fastening element can rotate relative to the first workpiece after the material of the first workpiece has flowed into the retaining groove. Also included is a device associated with the fastening element for attaching the fastening element to the second workpiece.

[0006] US 1,946,064 A describes a lubrication drive connection with a shaft that can penetrate a preformed recess in a receiving element, wherein the connection is further provided with a hanging projection arranged to penetrate the metal of the receiving element and displace it laterally when the shaft is driven into it, wherein the shaft has a recess therein.

[0007] Fasteners and mounting sleeves that are inserted into pre-drilled components must be distinguished from mounting sleeves that are punched into a component. Unlike those inserted into a pre-drilled component, the punched elements must have a punching surface that can withstand the forces occurring during the punching process.

[0008] A first example of such a self-punching element can be found in DE 10 2008 017 689 A1. The press-fit nut described here has an annular body comprising a first end face region, an outer circumferential surface, a bore that is at least partially threaded, and a seating surface region. The seating surface region includes an annular pin concentric to the bore and an annular shoulder surrounding a base region of the annular pin. The annular pin is designed as a radially plastically expandable structure, which, as such, serves to anchor the annular body to a component. The annular shoulder is provided with several engagement ribs arranged sequentially along its circumference, projecting axially from a main surface of the annular shoulder. Each engagement rib has a tapered back surface sloping down from a base region of the annular pin.

[0009] CN 102003448 A describes a square-headed rivet nut comprising a nut body. A threaded hole is located in the center of the nut body. The head of the nut body is flanged. Below the flange is a step with a conical surface shape, featuring a wide upper section and a narrow lower section. The step also has a protruding ribbed section. The connecting part of the flange and the step has a guide groove with a circular arc transition. This design allows the square nut to be securely mounted on a steel plate and also to be connected to other components.

[0010] A functional element for pressing into a workpiece, particularly a sheet metal part, is described in EP 4 023 894 A1 and comprises a functional section and a fastening section with a stop surface for introducing a pressing force into the functional element. Furthermore, a workpiece contact surface opposite the stop surface is provided, which can be brought into contact with the workpiece and is designed, in particular, as a flange. Additionally, a sealing area is provided in an axial and / or radial direction of the functional element between the workpiece contact surface and the functional section for receiving displaced material from the workpiece, forming a contact surface for the displaced material to seal a connection between the functional element and the workpiece.The contact surface has a first sub-surface which runs obliquely to the axial direction of the functional element and which converges when viewed in a pressing direction of the functional element, and a second sub-surface which adjoins the first sub-surface, runs obliquely to the axial direction of the functional element and which diverges when viewed in the pressing direction of the functional element.

[0011] Finally, US Patent 2007 / 258788 A1 discloses a slotted nut for fastening to a plastically deformable metal sheet, which has a contact surface suitable for bearing against the metal sheet. An undercut projection protrudes relative to the contact surface. Furthermore, a countersunk groove is provided, which is formed in the contact surface and at least partially surrounds the projection. The groove has no active undercuts relative to the projection. The groove comprises an inner groove and an outer groove, as well as a burr between them.

[0012] WO 2004 / 022987 A1 describes a self-locking female fastener, for example a punch nut, comprising an annular guide pin, an annular flange surrounding the guide pin, and an annular groove in the flange bearing surface surrounding the guide pin. The bottom wall of the groove has wedge-shaped recesses that divide the bottom wall of the groove into segments with parallel sides defined by the adjacent wedge-shaped recesses. The inclined outer wall of the guide pin deforms radially during assembly to enclose and compress the sheet metal in the groove, resulting in a tight and secure fit with improved pull-out and torsional strength.

[0013] One disadvantage of these mounting sleeves is that they can only be used in relatively soft materials, i.e., not in high-strength steels. Furthermore, it must be taken into account that the diameter of any through-hole in the mounting sleeve is severely limited to ensure that the mounting sleeve is not expanded and / or deformed during a punching process.

[0014] The object of the present invention is therefore to provide a self-punching metallic fastening sleeve that is improved compared to the prior art and is adapted to form an opening reinforcement in a metallic component. In particular, the improved self-punching metallic fastening sleeve should be able to be inserted into a high-strength metallic component and offer a greater range of applications with regard to the available diameter. Furthermore, it is an object of the present invention to provide a corresponding first component with the fastening sleeve, a connection structure with the first component and a second component, and a setting method for the fastening sleeve. 3. Summary of the invention

[0015] The above problem is solved by a self-punching metallic fastening sleeve according to independent claim 1, a first component with the fastening sleeve according to claim 12, a connection structure with the first component and a second component according to claim 14, and a setting method for fastening the fastening sleeve according to independent claim 15. Advantageous embodiments and further developments will become apparent from the following description, the drawings, and the pending claims.

[0016] A self-punching metallic fastening sleeve according to the invention is adapted to form an opening reinforcement in a metallic component, preferably in a high-strength metallic component.The fastening sleeve according to the invention has the following features: a hollow cylindrical shaft with a first and a second axial end, a flange arranged between the first and the second axial end and formed as a closed circumferential element around the shaft, wherein the first and the second axial end project beyond the flange, the flange having an embossing ring on the side facing the first axial end, which is arranged adjacent to the shaft, and a first shaft section between the flange and the first axial end provides a punching and fastening area for captive fastening of the fastening sleeve to the metallic component, wherein the punching and fastening area is preferably not radially expandable, and a second shaft section between the flange and the second axial end provides a functional area.

[0017] For better understanding, the self-punching metallic fastening sleeve according to the invention is explained below in the context of its use in a corresponding insertion process. The component into which the fastening sleeve is inserted is a metallic component, for example, a sheet metal part. The thickness of the sheet metal is preferably at most equal to the length of the first shaft section, i.e., the distance between the first axial end and the side of the flange facing the first axial end. Since it is a self-punching fastening sleeve, the component does not have any pre-drilled holes.

[0018] In a first step, the component and the mounting sleeve are prepared. The mounting sleeve is positioned with its first axial end adjacent to the component.

[0019] The mounting sleeve is now driven into the first component with its first axial end leading. A known setting tool with a punch and a die is used for this purpose. The punch can be in the form of a hollow cylinder, so that it engages only the flange of the mounting sleeve. Alternatively, the punch can engage only the second axial end of the shaft. In a further alternative, the punch is designed to engage both the flange and the second axial end of the shaft. All three embodiments will be explained in detail later with reference to the preferred embodiments.

[0020] When the fastening sleeve is driven into the component, a stamped slug is cut off from the first component. To ensure the removal of the stamped slug, the die is designed as a hollow cylinder in a known manner.

[0021] After the mounting sleeve is driven into the component and the stamped slug is separated from the component, the embossing ring rests against the component. The mounting sleeve is then driven further into the component, pressing the embossing ring into it. This displaces material from the first component towards the first shaft area, and the mounting sleeve is securely and permanently positioned within the component due to a frictional connection.

[0022] The first axial end, and thus also the first shaft section, serves as the punching and fastening area within the component. Due to the dimensions, i.e., the length of the first shaft section and the thickness of the component, the fastening sleeve is exclusively fastened within the component.

[0023] A subsequent connection to another or a second component is made via the functional section of the mounting sleeve at a later point in time. This functional section can be designed as desired, particularly with regard to its dimensions. It can also have an internal and / or external thread. Alternatively, it can be unthreaded internally and / or externally.

[0024] One advantage of the fastening sleeve according to the invention is that it can be inserted into the component in a single-stage process. Furthermore, it is self-punching. The locking mechanism achieved through the frictional connection between the first component and the fastening sleeve also provides high pull-out forces of over 1 kN and preferably over 5 kN compared to the prior art.

[0025] In a preferred embodiment of the self-punching metallic fastening sleeve, the outer diameter of the first shaft section and the outer diameter of the second shaft section are smaller than the outer diameter of the flange. Preferably, the outer diameter of the first shaft section is also smaller than the outer diameter of the second shaft section. Thus, both the functional area and the punching and fastening area have a smaller outer diameter than the flange. This clarifies that the first and second axial ends project beyond the flange. It also emphasizes that the flange serves to abut at least the component into which the fastening sleeve is inserted. Preferably, when used within a connection structure, a further or second component is located on the side of the flange facing the second axial end of the shaft.

[0026] In a further preferred embodiment of the metallic fastening sleeve, the first axial end provides an annular punched surface. Furthermore, the first axial end has at least one of the following features: an inner diameter that is 0.7 to 0.8 times the outer diameter, an outer diameter between 25 mm and 45 mm, an inner diameter between 17 mm and 36 mm, and / or the punched surface has a diameter of at least 1.75 cm², preferably at least 2.5 cm², and particularly preferably at least 3 cm². These dimensions clearly indicate that the fastening sleeve is not a self-piercing rivet or a semi-tubular self-piercing rivet. An outer diameter between 25 mm and 45 mm, in particular, means that a large opening is created in the component. This is also reflected in the preferred inner diameter and the corresponding punched surface.

[0027] The differences also become clear when using this mounting sleeve. Starting with a metallic component and the dimensioning of the mounting sleeve at the first axial end, high punching forces of approximately 90 kN and even higher setting forces of approximately 120 kN are to be expected. However, smaller outer diameters in the first shank section carry the risk that the load or stress in this section will become too high for the intended application, potentially leading to deformation. For the sake of completeness, it should be noted that the punching area A is calculated as A = π 4 D 2 − d 2 = π R 2 − r 2 .

[0028] Here, D represents the outer diameter in the first shaft section, preferably at the first axial end, and d represents the inner diameter in the first shaft section, preferably at the first axial end. Similarly, R represents the outer radius and r the inner radius of the first shaft section, preferably at the first axial end.

[0029] Advantageously, the first axial end provides an annular stamping surface, and the first shank section has at least one of the following features: longitudinal knurling on its radial outer surface, a length corresponding to 0.2 to 1.0 times the width of the annular stamping surface, and / or a chamfer on the radial inner surface adjacent to the first axial end. The longitudinal knurling on the outer surface prevents rotation within the component. The chamfer on the inner diameter ensures defined slug formation and facilitates slug removal. The length of the first shank section, in combination with the width of the annular stamping surface, ensures particularly high stability of the first shank section, especially when inserted into a high-strength metallic component.

[0030] In a further preferred embodiment of the self-punching metallic fastening sleeve, the stamping ring is continuous and has at least one of the following features: an arc-shaped contour, preferably with a radius between 1.0 and 2.5 mm; a height relative to the side of the flange facing the first axial end between 0.0022 and 0.05 times the outer diameter at the first axial end, preferably between 0.0067 and 0.032 times; and / or a height relative to the side of the flange facing the first axial end of 0.1 to 0.8 mm. The arc-shaped contour, and particularly within the aforementioned radius range, ensures that sufficient material of the component is displaced to achieve a force-fit in the first shaft region.Here too, taking the outer diameter at the first axial end into account is particularly advantageous, as this results in a particularly good match between the stamping surface at the first axial end and the displacement behavior when inserting the mounting sleeve into the component.

[0031] According to the invention, the fastening sleeve has a circumferential annular groove in the first shaft section, which is preferably arranged adjacent to the flange and / or is continuous. The annular groove ensures that the force transmission between the component and the first shaft section of the fastening sleeve is further improved. This is especially true when the annular groove is arranged adjacent to the flange and / or is continuous. For example, the arrangement of the annular groove adjacent to the flange particularly effectively ensures that a sufficient amount of material from the component can be displaced into the annular groove by the embossing ring when the fastening sleeve is inserted into the component.

[0032] In a particularly preferred embodiment of the self-punching metallic fastening sleeve, which has an annular groove, the annular groove comprises at least one of the following features: an arc-shaped contour, preferably with a radius between 1 mm and 2.5 mm, and / or a depth in the range of approximately 0.1 mm. The preferred range for the radius of the annular groove ensures that the annular groove does not have excessively delicate edges and is not too small, preventing material from the component from being displaced into the annular groove. Regarding the depth, it should be noted that a deeper annular groove is theoretically possible, but typically only a few hundredths of a millimeter of undercut are required. Therefore, a shallow annular groove depth is also generally preferred, as long as any material from the component displaced by the punching ring can escape into it.

[0033] According to the invention, the embossed ring and the annular groove merge seamlessly. With regard to the fastening sleeve provided with an annular groove, it is further advantageous if this fastening sleeve has at least one of the following features: the embossed ring and the annular groove merge directly into one another; viewed in the radial direction, the height of the embossed ring and the height of the annular groove overlap, so that an undercut is present; and / or the height of the annular groove is between four and ten times the height of the embossed ring, preferably the height of the annular groove is between 0.4 mm and 8 mm. In particular, the seamless merger of the embossed ring and the annular groove ensures that the component material can engage with the first shaft region particularly effectively. The overlap of the height of the embossed ring and the height of the annular groove in the radial direction forms an undercut.The height of the embossing ring influences how much material is displaced. If the height is too low, too little of the component's material is deformed, and the retaining sleeve quickly comes into contact with the component. This negatively impacts the retention of the retaining sleeve in the component and is evident from a rapid and significant increase in force.

[0034] In a further preferred embodiment of the self-punching metallic fastening sleeve, the flange has a profile on the side facing the first axial end of the shaft and / or the side facing the second axial end of the shaft, preferably in the form of a cam surface and / or in the form of radially extending ribs. Depending on the side on which the profile is arranged on the flange, the profile on the flange serves as an anti-rotation feature on the first component, which is particularly preferred in combination with longitudinal knurling on the shaft, or as an anti-rotation feature on a further or second component, provided that this component rests against the flange within a corresponding connection structure. The design of the anti-rotation feature as a cam surface and / or as radially extending ribs provides a particularly effective anti-rotation feature.

[0035] Advantageously, the mounting sleeve has a further embossed ring on the side of the flange facing the first axial end of the shaft, which is arranged radially outwards relative to the first embossed ring. The presence of a further or second embossed ring ensures a higher degree of tightness, which is particularly desirable for fluid-tight connections, i.e., liquid- and / or gas-tight connections.

[0036] Finally, it is preferred that the self-punching metallic fastening sleeve is made of a metallic material with a Vickers hardness HV 10 according to DIN EN ISO 6507-1 of approximately 320, in particular a manganese-boron steel. This is achieved by manufacturing the fastening sleeve by cold forging and subsequent tempering. The material for the fastening sleeve is therefore preferably a tempering steel and particularly preferably a manganese-boron steel.

[0037] The material used for the retaining sleeve is particularly important when combined with a high-strength component material to ensure the sleeve is securely inserted. This is especially true for components with a tensile strength of approximately 600 MPa, such as those made of DP 600 steel. This design of the retaining sleeve is even more critical when it is to be inserted into a high-strength metallic component, such as one made of DP 800 steel or a component with an even higher tensile strength. For example, with a DP 600 steel component and a retaining sleeve with an outer diameter of 26 mm in the first shank section, a force of approximately 90 kN is required to punch out the initial slug. To then securely fasten the retaining sleeve within the component, a force of approximately 120 kN is necessary.In addition to the dimensions of the mounting sleeve, the choice of material for the mounting sleeve is also important.

[0038] A first component according to the invention comprises a self-punching metallic fastening sleeve according to the invention. Advantageously, the first component is a metallic component, preferably made of DP 600 or DP 800 steel, and particularly preferably a high-strength metallic component. Furthermore, the first component is preferably not pre-drilled in the area where the fastening sleeve according to the invention is to be inserted. Since the fastening sleeve according to the invention is used in the first component according to the invention, reference is made to the above descriptions regarding the resulting technical effects and advantages in order to avoid repetition.

[0039] A connection structure according to the invention consists of a first component and a second component, which are directly or indirectly connected to each other via the functional area of ​​the fastening sleeve. In this respect as well, we refer to the above explanations regarding the technical effects and advantages, since the connection structure according to the invention comprises the first component and thus also the fastening sleeve.

[0040] An insertion method according to the invention for fastening the fastening sleeve according to the invention in a component comprises the following steps: providing the component, preferably without pre-drilling, and the fastening sleeve according to the invention; driving the fastening sleeve into the component with its first axial end first, so that a punched slug is cut off; and pressing the embossing ring into the component, whereby material of the component is displaced towards the first shaft region and the fastening sleeve is arranged in the component in a way that prevents it from being lost due to a frictional connection. Preferably, and if the fastening sleeve also has an annular groove, additional material of the component is displaced into the annular groove during the step of pressing the embossing ring into the component. The insertion method according to the invention establishes the connection between the fastening sleeve and the component.Therefore, reference is also made in this respect to the above discussions and the first component according to the invention. 4. Brief summary of the drawings

[0041] The present invention is described in detail below with reference to the drawings. Identical reference numerals in the drawings denote identical components and / or elements. The drawings show: Figure 1 is a perspective view of a first embodiment of a fastening sleeve according to the invention, Figure 2 is a sectional view of the embodiment according to Figure 1 Figure 3 shows an enlarged sectional view of the circled area. Figure 2 Figure 4a shows a sectional view of a first embodiment of a setting tool for setting the fastening sleeve according to Figure 1 Figure 4: Sectional view of a second embodiment of a setting tool for setting the fastening sleeve according to Figure 1Figure 4 shows a sectional view of a third embodiment of a setting tool for setting the fastening sleeve according to Figure 1 Figure 5 shows different states during the setting process of the fastening sleeve according to Figure 1 In sectional view, Figure 6 shows an enlarged sectional view of the circled area of ​​the second illustration from the left. Figure 5 Figure 7 shows a section view of a further embodiment of a fastening sleeve according to the invention, Figure 8 shows a section view of an embodiment of a connection structure according to the invention and Figure 9 shows a schematic process flow of an embodiment of a setting method according to the invention. 5. Detailed description of preferred embodiments

[0042] The following and with reference to the Figures 1 to 3 A first embodiment of a fastening sleeve 1 according to the invention is described in detail with regard to its construction. Following this, with reference to the Figures 4a to 4cthe setting tool and with reference to the Figures 5 and 6 The conditions during the setting of the mounting sleeve 1 are explained.

[0043] The fastening sleeve 1 is a self-punching metallic fastening sleeve 1 manufactured by cold forging. After cold forging, the material of the fastening sleeve 1 was heat-treated to preferably achieve a Vickers hardness HV 10 according to DIN EN ISO 6507-1 of approximately 320. The material for the fastening sleeve 1 is therefore preferably a heat-treatable steel and particularly preferably a manganese-boron steel. For the sake of completeness, it should be noted that manufacturing the fastening sleeve 1 by turning is not cost-effective due to its design characteristics.

[0044] The fastening sleeve 1 is adapted to form an opening reinforcement in a metallic component 3, preferably in a high-strength metallic component 3. The component 3 consists, for example, of a metal with a tensile strength of 600 MPa, such as DP 600 steel. Alternatively, the component 3 consists of DP 800 steel or another preferably high-strength metal.

[0045] The fastening sleeve 1 is to be securely fastened in this component 3 to allow subsequent connection to a further or second component 50. For this purpose, the fastening sleeve 1 comprises a hollow cylindrical shaft 10 with a first axial end 12 and a second axial end 14, which defines a central longitudinal axis L. A flange 16 is arranged between the first 12 and the second axial end 14 and is formed as a closed, continuous flange around the shaft 10. The flange 16 can have a profile on the side facing the first axial end 12 of the shaft 10 and / or on the side facing the second axial end 14 of the shaft 10 as an anti-rotation contour. The corresponding profile is preferably in the form of a cam surface and / or in the form of radially extending ribs.

[0046] As in the Figures 1 to 3As can be seen, the first 12 and the second axial end 14 protrude beyond the flange 16. A first shaft section 20 is therefore present between the flange 16 and the first axial end 12. This provides a punching and fastening area for the captive attachment of the fastening sleeve 1 to the metallic component 3. As will be explained in detail later, this punching and fastening area cannot be radially expanded precisely because of its dimensions.

[0047] A second shaft section 30 is located between the flange 16 and the second axial end 14 and provides a functional area. This functional area later serves, within a connection structure, to connect component 3 with the mounting sleeve 1 directly or indirectly to the further or second component 50. In the illustrated embodiment, the second shaft section 30 has a chamfer 32 on its radial outer surface adjacent to the second axial end 14.

[0048] An outer diameter DS of the first shaft section 20 and an outer diameter DB of the second shaft section 30 are smaller than an outer diameter DF of the flange 16. This also emphasizes that the first 20 and the second shaft section 30, and thus the first 12 and the second axial end 14, project beyond the flange 16. In this context, it is particularly preferred, as in the Figures 1 to 3 It is shown that the outer diameter DS of the first shaft area 20 is smaller than the outer diameter DB of the second shaft area 30.

[0049] The first axial end 12 has an inner diameter D B2 and thus provides an annular punching surface. This serves to separate a punched slug from component 3 when the mounting sleeve 1 is inserted into component 3, since component 3 is not pre-drilled in the mounting area of ​​the mounting sleeve 1. The annular punching surface A is calculated in this case according to the formula: A = π 4 D S 2 − D B 2 2 .

[0050] The inner diameter DB2 is, for example, between 0.7 and 0.8 times the outer diameter DS. Preferably, the outer diameter DS is between 25 and 45 mm. For an inner diameter DB2, a range between 17 mm and 36 mm is preferred. The resulting stamping area is at least 1.75 cm², preferably at least 2.5 cm², and particularly preferably at least 3 cm². With an exemplary outer diameter DS of 27 mm and an exemplary inner diameter DB2 of 20 mm, the inner diameter DB2 is 0.74 times the outer diameter DS. The corresponding stamping area A is 2.58 cm².

[0051] A smaller outer diameter DS of the first shaft section 20 leads to higher loads and stresses, potentially causing deformation. Therefore, this dimension is preferred. However, it should be noted that increasing the outer diameter DS significantly increases the required punching forces, a point that will be discussed later.

[0052] For the sake of completeness, it should be noted that the second shaft section 30 also has an inner diameter D B1. This is smaller than the inner diameter D B2 of the first shaft section 20, so that a step is present inside the shaft 10. The inner diameter D B1 in the second shaft section 30 is, for example, 18 mm. Since, as mentioned above, the outer diameter DB of the second shaft section 30 is larger than the outer diameter DS of the first shaft section 20, it is, for example, 29 mm.

[0053] It is of course possible for the inner diameter to be the same in the first shaft section (20 mm) and the second shaft section (30 mm). In this configuration, there is therefore no step at the transition from the first shaft section (20 mm) to the second shaft section (30 mm).

[0054] As in Figure 6 As can be seen, the first shaft section 20 has a chamfer 24 on the radial inner side adjacent to the first axial end 12. This allows both the formation of the stamping slug and its removal to be specifically influenced.

[0055] To positively influence the subsequent retention of the mounting sleeve 1 in the component 3, the first shaft section 20 can have longitudinal knurling on its radial outer surface. This later provides an anti-rotation feature for the mounting sleeve 1 in the first component 3.

[0056] The first shaft section 20 must withstand significant forces during the punching and setting process. Therefore, with regard to the dimensioning of the first shaft section 20, it is preferred that it has a length LS corresponding to 0.2 to 1.0 times the width of the annular punching surface. Based on the example above with an outer diameter DS of 27 mm and an inner diameter D B2 of 20 mm, the width of the annular punching surface is (27 mm - 20 mm) / 2 = 3.5 mm. The length LS should thus be between 0.7 mm and 3.5 mm. For example, the length LS is 2.5 mm, which corresponds to 0.71 times the width of the annular punching surface.

[0057] The flange 16 has a stamping ring 18 on the side facing the first axial end 12. This ring is located adjacent to the shaft 10. For example, the radial outer surface of the stamping ring 18 has a diameter of 31 mm. The stamping ring 18 is continuous and has an arc-shaped contour. The radius RP of the stamping ring 18 is between 1.0 mm and 2.5 mm. For example, the radius RP is 1.8 mm.

[0058] The height HP of the embossing ring 18, relative to the side of the flange 16 facing the first axial end 12, is between 0.0022 and 0.05 times the outer diameter DS at the first axial end 12, and preferably between 0.0067 and 0.032 times. In a preferred embodiment, the height HP of the embossing ring 18 is between 0.1 mm and 0.8 mm. For example, the height HP of the embossing ring 18 is 0.2 mm. This results in a factor of 0.0074, based on the exemplary outer diameter DS of 27 mm. Due to the embossing ring 18 being dimensioned in this way, the material of the component 3 is displaced particularly effectively towards the first shaft region 20 when the fastening sleeve 1 is inserted into the component 3, and the fastening sleeve 1 is positively secured in the component 3.

[0059] In summary, the combination of radius RP, height HP and position of the embossing ring 18 ensures that sufficient material of component 3 can be displaced towards the first shaft area 20 to secure the fastening sleeve 1 in component 3.

[0060] To enhance this effect, a circumferential annular groove 22 is provided in the first shaft section 20 of the mounting sleeve 1. This groove is located adjacent to the flange 16 and is continuous. Alternatively, the flange can also be interrupted.

[0061] The annular groove 22 has an arc-shaped contour, preferably with a radius RN between 1 mm and 2.5 mm. The depth TN of the annular groove 22 is approximately 0.1 mm. This dimensioning of the annular groove 22 ensures that sufficient material can be displaced into the groove 22 and, at the same time, that the annular groove 22 is easy to manufacture.

[0062] The material intake in the annular groove 22 is further determined by the dimensioning of the height HN of the annular groove 22. The height HN of the annular groove 22 is preferably between 0.4 mm and 8 mm. For example, the height HN is 1.5 mm. With regard to the aforementioned total length LS of the first shaft section 20, this is therefore composed of the height HN of the annular groove 22 and a height HS between the first axial end 12 and the annular groove 22. Based on a height HN of the annular groove 22 of 1.5 mm and a total length LS of 2.5 mm, the height HS is 1.0 mm.

[0063] Regarding the interaction between the embossing ring 18 and the annular groove 22, it is essential, as can be seen in the illustrated embodiment, that both transition seamlessly into one another. Preferably, the embossing ring 18 and the annular groove 22 transition directly into one another. If a transition is present, it should be kept as small as possible. This is because, on the one hand, the embossing ring 18 should be positioned as close as possible to the shaft 10, while on the other hand, it should not obstruct the annular groove 22.

[0064] Especially with regard to Figure 3 It becomes clear that the height HP of the embossing ring 18 and the height HN of the ring groove 22 overlap in the radial direction, resulting in an undercut. This allows the fastening sleeve 1 to be particularly effectively and force-fitted into component 3.

[0065] It is preferred that the height HN of the ring groove 22 is between 4 and 10 times the height HP of the embossing ring 18. Thus, the height HN of the ring groove 22 is preferably between 0.4 mm and 8 mm. For example, the height is 1.5 mm, which results in a factor of 7.5.

[0066] Now, referring to the Figures 4a to 4c Three embodiments of a setting tool are shown in sectional view. The setting tool serves to set the fastening sleeve 1 into the component 3 and comprises a punch 7; 7'; 7" and a die 9. According to the different embodiments, the punch 7 can be hollow cylindrical, as shown in Figure 4a as shown. In this case, the punch 7 engages the flange 16 of the mounting sleeve 1. In the embodiment according to Figure 4b The punch 7' is designed such that it engages exclusively at the second axial end 14 of the mounting sleeve 1. Finally, it shows Figure 4ca punch 7”, which engages both the flange 16 and the second axial end 14 of the mounting sleeve 1. The die 9 is hollow cylindrical to allow the removal of a stamped slug 5.

[0067] The setting procedure is described below with reference to Figure 5 explained, in which the stamp has been omitted for clarity. From left to right shows Figure 5 First, the initial state. Here, component 3 is positioned on the die 9, and the mounting sleeve 1 is located adjacent to it. The first axial end 12 of the mounting sleeve 1 rests against component 3.

[0068] Now the fastening sleeve is driven into component 3, whereby the punched slug 5 is cut off. This state is magnified in Figure 6 depicted.

[0069] After the stamping slug 5 is cut off, the embossing ring 18 is pressed into the component 3, whereby material of the component 3 is displaced in the direction of the first shaft area 20 and the fastening sleeve 1 is arranged on the component 3 in a force-fit manner.

[0070] Figure 7 Figure 1 shows an embodiment of the fastening sleeve with a second embossing ring 40. This serves in particular to achieve a higher level of tightness with regard to fluids.

[0071] One embodiment of a connection structure is shown in Figure 8 Shown in sectional view. Here, component 3, with the mounting sleeve 1 attached to it, is connected to the second component 50. The fastening is achieved using a screw 52 in conjunction with a nut 54.

[0072] Finally, and referring to Figure 9The process of one embodiment of a setting method according to the invention is described. In a first step A, the component 3, preferably without pre-drilling, and the fastening sleeve 1 are provided. Then, in step B, the fastening sleeve 1 is driven into the component 3 with its first axial end 12 leading, so that a punched slug 5 is cut off.

[0073] Subsequently, the embossing ring 18 is pressed into the component 3, displacing material from the component 3 towards the first shaft area 20 and securing the retaining sleeve 1 in the component 3 by means of a frictional connection. Preferably, and if the retaining sleeve 1 also has the annular groove 22, additional material from the component 3 is displaced into the annular groove 22 during the pressing step of the embossing ring 18 into the component 3. 6. List of reference symbols

[0074] 1 Mounting sleeve 3 Component 5 Punch slug 7 Punch 9 Die 10 Shank 12 First axial end 14 Second axial end 16 Flange 18 Embossing ring 20 first shaft area 22 ring groove 24 chamfer 30 second shaft area 32 chamfer 40 further or second embossing ring 50 second component 52 screw 54 nut DB Outer diameter second shaft section 30 D B1 Inner diameter second shaft section 30 D B2 Inner diameter first shaft section 20 DF Outer diameter flange 16 DS Outer diameter first shaft section 20 HN Height of ring groove 22 HP Height of embossing ring 18 HS Height of the first shaft area 20 between first axial end 12 and ring groove 22 Lcentral longitudinal axis LS Length or height of the first shaft section 20 RN radius of the ring groove 22 RP radius of the embossing ring 18 TN Ring groove depth 22

Claims

1. A self-piercing metal fastening sleeve (1) which is adapted to form an opening reinforcement in a metallic component (3), preferably a high-strength metallic component (3), and which comprises the following features: a) a hollow-cylindrical shaft (10) with a first (12) and a second axial end (14), b) a flange (16) which is arranged between the first (12) and the second axial end (14) and is circumferentially formed in a closed manner around the shaft (16), wherein c) the first (12) and the second axial end (14) project beyond the flange (16), and d) a first shaft portion (20) between the flange (16) and the first axial end (12) provides a piercing and fastening portion for the loss-proof fastening of the fastening sleeve (1) at the metallic component (3) wherein the piercing and fastening portion are preferably not enlargeable radially and a second shaft portion (30) between the flange (16) and the second axial end (14) provides a functional portion, characterized in that e) the flange (16) comprises an embossing ring (18) on the side which faces the first axial end (12), wherein the embossing ring (18) is arranged adjacent to the shaft (10), and f) the fastening sleeve (1) comprises a circumferential annular groove (22) in the first shaft portion (20), wherein g) embossing ring (18) and annular groove (22) transition into one another.

2. The self-piercing metal fastening sleeve (1) according to claim 1, having an outer diameter (DS) of the first shaft portion (20) and an outer diameter (DB) of the second shaft portion (30) which are smaller than an outer diameter (DF) of the flange (16), wherein preferably, the outer diameter (Ds) of the first shaft portion (20) is smaller than the outer diameter (DB) of the second shaft portion (30).

3. The self-piercing metal fastening sleeve (1) according to one of the preceding claims, where the first axial end (12) provides an annular piercing surface and the first axial end (12) comprises at least one of the following features: a) an inner diameter (DB2), which amounts to 0.7 times to 0.8 times of the outer diameter (DS), b) an outer diameter (DS) between 25 mm and 45 mm, c) an inner diameter (DB2) between 17 mm and 36 mm, and / or d) the piercing surface is at least 1.75 cm2, preferably at least 2.5 cm2 and particularly preferred at least 3 cm2.

4. The self-piercing metal fastening sleeve (1) according to one of the preceding claims, wherein the first axial end (12) provides an annular piercing surface and the first shaft portion (20) comprises at least one of the following features: a) a longitudinal knurling at its radial outside, b) a length (LS) corresponding to 0.2 to 1.0 times of a width of the annular piercing surface and / or c) a chamfer (24) at the radial inside adjacent to the first axial end (12).

5. The self-piercing metal fastening sleeve (1) according to one of the preceding claims wherein the embossing ring (18) is configured without interruptions and comprises at least one of the following features: a) a arc-like contour, preferably having a radius (RP) between 1.0 and 2.5 mm, b) a height (HP) with respect to the side of the flange (16) which faces the first axial end (12) between 0.0022 times and 0.05 times of the outer diameter (DS) at the first axial end (12), preferably between 0.0067 times and 0.032 times, and / or c) a height (HP) with respect to the side of the flange (16) which faces the first axial end (12) of 0.1 to 0.8 mm.

6. The self-piercing metal fastening sleeve (1) according to one of the preceding claims, wherein the annular groove (22) is arranged adjacent to the flange (16) and / or configured without interruptions.

7. The self-piercing metal fastening sleeve (1) according to one of the preceding claims wherein the annular groove (22) comprises at least one of the following features: a) an arc-shaped contour preferably having a radius (RN) between 1 mm and 2.5 mm and / or b) a depth (TN) in the range of approximately 0.1 mm.

8. The self-piercing metal fastening sleeve (1) according to one of the preceding claims, having at least one of the following features: a) embossing ring (18) and annular groove (22) transition into one another directly, b) when viewed in radial direction, the height (HP) of the embossing ring (18) and the height (HN) of the annular groove (22) overlap so that there is an undercut and / or c) the height (HN) of the annular groove (22) lies between 4 times and 10 times of the height (HP) of the embossing ring (18), preferably, the height (HN) of the annular groove (22) lies between 0.4 mm and 8 mm.

9. The self-piercing metal fastening sleeve (1) according to one of the preceding claims, wherein the flange (16) comprises a profiling as an anti-rotation securing contour on the side which faces the first axial end (12) of the shaft (10) and / or on the side which faces the second axial end (14) of the shaft (10), preferably in the form of a cam surface and / or in the form of rips extending in radial direction.

10. The self-piercing metal fastening sleeve (1) according to one of the preceding claims having a further embossing ring (40) on the side of the flange (16) which faces the first axial end (12) of the shaft (10), wherein the flange (16) is arranged radially outside with respect to the first embossing ring (18).

11. The self-piercing metal fastening sleeve (1) according to one of the preceding claims, consisting of a metallic material with a Vickers hardness HV 10 according to DIN EN ISO 6507-1 of approximately 320, in particular a manganese-boron steel.

12. A first component (3) into which a self-piercing metal fastening sleeve (1) according to one of the preceding claims is set.

13. The first component (3) according to claim 12, wherein the first component (3) is a metallic component (3), preferably out of a DP600 or DP800 steel and particularly preferred a high strength metallic component.

14. A connecting structure out of a first component (3) according to one of the preceding claims 12 or 13 and a second component (50) which are directly or indirectly connected with one another via the functional portion of the fastening sleeve (1).

15. A setting method for fastening the fastening sleeve (1) according to one of the claims 1 to 11 in a component (3) comprising the steps: a) providing the component (3), preferably without a pre-punched hole, as well as the fastening sleeve (1) according to one of the claims 1 to 11, b) driving-in the fastening sleeve (1) with the first axial end (12) first into the component (3), so that a piercing slug (5) is separated, and c) pressing the embossing ring (18) into the component (3) so that material of the component (3) is pushed into the direction of the first shaft portion (20) and the fastening sleeve (1) is arranged in a loss proof manner in the component (3) due to a force fit.

16. The setting method according to claim 15, wherein the fastening sleeve (1) furthermore provides an annular groove (22) so that during the step of impressing the embossing ring (18) into the component (3), material of the component (3) is additionally pushed into the annular groove (22).