Broken-core blind rivet and method for producing electrically conductive rivet connection

Abstract

The invention relates to a broken-core blind rivet (100) for the electrically conductive riveting of a first component (210) to a second component (220), comprising a sleeve (110), which is formed with a head (112) and a shaft (111), and comprising a pull-out mandrel (120), which is formed with a mandrel head (122). According to the invention, the shaft (111) and / or the spindle head (122) have / has at least one scraping element (130) arranged on the outer circumferential surface thereof, said scraping element being designed to scrape and remove paint deposits or contaminants along the bore wall when the sleeve (110) is introduced into a rivet bore (300) provided for this purpose. The invention also relates to a method for producing an electrically conductive rivet connection using such a broken core blind rivet (100).

Description

Technical Field

[0001] The invention relates to a broken core blind rivet according to the preamble of claim 1. The invention also relates to a method for producing an electrically conductive rivet connection between two components by means of a broken core blind rivet. Background Art

[0002] Broken-core blind rivets and methods for producing rivet connections using broken-core blind rivets are known from the prior art, with reference to DE 20102898 U1 and EP 3111097 B1 as representatives.

[0003] A broken core blind rivet (pulling mandrel rivet) has a sleeve (rivet sleeve) with a shank (sleeve shank) and a head (sleeve head) and a pulling mandrel (rivet mandrel) protruding through the sleeve, i.e. the shank and the head. The pulling mandrel is configured with a mandrel head (rivet head) and typically also with at least one predetermined breaking point. In addition, the above-mentioned names or the alternative names indicated in brackets are used to describe the invention, wherein other names are also often used in the prior art.

[0004] Riveting (i.e. producing a riveted connection or a rivet connection by means of a broken-core blind rivet) comprises at least two sub-processes: firstly, the sleeve is introduced or inserted into the rivet opening or rivet (hole) hole provided for this purpose, and secondly, the sleeve is expanded by pulling the pulling mandrel while being supported by the head or applying an axial tensile force to the pulling mandrel (also called installation or installation process in a narrow sense), whereby the sleeve is plastically deformed in a known manner.

[0005] Furthermore, special embodiments of broken-core blind rivets are known from the prior art, which are suitable for producing an electrical connection while achieving good contact.

[0006] The closest DE 36 12 501 A1 describes a broken core blind rivet whose shank is provided with longitudinally directed grooves distributed over the circumference, wherein the grooves extend as axial grooves substantially over the length of the shank inside the (rivet) hole. The grooves make it possible for the ribs that remain unchanged between the grooves to come to bear under particularly high pressure against the wall of the hole through which the rivet or its shank extends when the mandrel is pulled (pulled out). Any contamination or, if necessary, paint layers are broken off in this way, so that good contact conduction between the component and the ribs is produced.

[0007] In addition, the broken-core blind rivet described in DE 36 12 478 A1 is also mentioned, which also enables particularly good electrical contacting. Summary of the invention

[0008] Starting from the above-cited closest prior art, the object of the present invention is to provide an improved broken core blind rivet and a method for producing an electrically conductive rivet connection which can be implemented thereby, which are particularly suitable also for painted components and can reliably achieve low-resistance electrical contacting.

[0009] The object is achieved by a broken core blind rivet according to the invention having the features of claim 1 and by a method according to the invention having the features of the independent claim. The invention also extends to a preferred use of a broken core blind rivet according to the invention by means of a further independent claim. Additional features are derived analogously for all subjects of the invention from the dependent claims, the further description of the invention and the drawings, wherein this explicitly also includes features described by way of example and as an option.

[0010] The invention is particularly suitable for grounding vehicle components, in particular vehicle electrical components, to already painted body parts or to already painted vehicle bodies, as will be explained in greater detail below.

[0011] The broken core blind rivet according to the invention is provided for electrically conductive riveting of a first component (this means at least one first component) to a second component (this means at least one second component). The broken core blind rivet according to the invention comprises a sleeve with a head and a shank and a pulling mandrel with a mandrel head. The broken core blind rivet according to the invention is characterized in that the shank (of the sleeve) and / or the mandrel head (of the pulling mandrel) have at least one scraping element arranged on their outer circumference, the scraping element being provided for scraping along the hole wall when the sleeve is introduced into the rivet hole provided for this purpose and thereby removing or at least breaking off possible paint deposits and / or contaminants on the hole wall. Preferably, the at least one scraping element is arranged only on the shank or only on the mandrel head.

[0012] Conductive riveting or conductive rivet connection refers to a form-fitting and permanent joint connection between a first component and a second component, which is achieved by means of a broken core blind rivet, and which is designed so that a conductive connection also exists at the connection point or joint between the first component and the second component. If a direct conductive connection is not possible at the connection point between the first component and the second component (for example due to a paint coating, a protective layer or the like), the conductive connection is also achieved at least indirectly via the installed or embedded broken core blind rivet. The broken core blind rivet thus acts to a certain extent as a joint element and an electrical contact-conducting element.

[0013] The broken core blind rivet according to the invention has at least one scraping element arranged on the outer circumference of the shank (sleeve shank) and / or at least one scraping element arranged on the outer circumference of the mandrel head. The outer circumference refers to the radial or lateral side of the shank or mandrel head. The scraping element can also extend from the relevant side until it enters the axial end face of the shank or mandrel head. The at least one scraping element is designed to scrape along the hole wall, that is, along the inner circumference of the rivet hole extending through the first component and the second component when the sleeve is introduced or pushed into the rivet hole provided for this purpose, and in this way (based on the scraping effect; see below) completely or partially remove or at least break open possible paint deposits, contaminants or the like inside the rivet hole located at the first component and / or the second component. During the subsequent expansion of the sleeve, a good, i.e. low-ohmic, electrically conductive contact can be generated between the sleeve and at least one of the components.

[0014] The scraping effect is achieved in particular by the sharp-edged configuration of the at least one scraping element and / or by a high friction coefficient between the scraping element and the hole wall. A combined cutting and scraping effect can also be caused if necessary by the sharp-edged, in particular blade-like configuration of the at least one scraping element.

[0015] Preferably, the at least one scraping element is designed with respect to the rivet hole in such a way that, during introduction or insertion, only possible paint deposits, contamination or the like are removed or at least broken apart without significant removal of base material on the component. Ideally, the hole wall of the rivet hole has a glossy, in particular metallic, sheen after the introduction of the broken core blind rivet according to the invention.

[0016] Unlike the broken core blind rivet described in DE 36 12 501 A1, which only breaks apart dirt or paint in the rivet hole during expansion, the broken core blind rivet according to the invention is designed so that paint or paint deposits, dirt and the like that prevent or impede contact are already scraped off or removed or broken apart during introduction or insertion into the rivet hole. In this case, the detached particles can thus fall out of the rivet hole or be pushed through and thus cannot cause further damage.

[0017] The broken core blind rivet according to the invention is particularly suitable for producing an electrically conductive rivet connection between two components, wherein at least one of the components is painted after the introduction of the rivet hole or the rivet opening, so that the paint deposits are located inside the rivet hole. The broken core blind rivet according to the invention can be introduced or installed directly into the rivet hole, that is, without separate pretreatment. This can be done in particular automatically or semi-automatically, as explained in more detail below.

[0018] The sleeve and / or the pulling mandrel of the broken core blind rivet according to the invention are preferably made of metal, in particular of steel, preferably in the case of an integral construction. The at least one scraping element can be integrated into the sleeve wall or the rod wall, that is, it can be integrally constructed with the sleeve or the rod. The sleeve or the rod can be cold extruded, wherein the at least one scraping element can be extruded together or subsequently stamped, so that the scraping element is constructed to be particularly hard due to cold work hardening. In addition, the sleeve (including the at least one scraping element) can also be manufactured in another way, in particular by other forming, such as upsetting, cutting and / or cutting manufacturing methods. The same content applies similarly to the mandrel head, that is, the at least one scraping element can be integrated into the mandrel head, that is, it can be integrally constructed with the mandrel head. But in principle, the scraping element can also be manufactured separately and fixed to the sleeve or the rod or the mandrel head in a suitable manner (non-integral construction).

[0019] The scraping element can be constructed as a rib that protrudes radially or protrudes in the radial direction. The rib is especially a narrow, ridge-like protrusion. The rib can extend straight in the axial direction, in the circumferential direction or in a spiral shape. Towards the head (sleeve head), the rib can be constructed as a cone, that is, it is constructed with a gradually increasing rib height (in the radial direction) and / or rib width (in the circumferential direction). The rib can extend continuously, especially in a conical structure, over the entire axial length of the rod or mandrel head (that is, from the front rod end or the front axial end of the rod, that is, the rod end facing away from the head or the axial end of the rod facing away from the head to the head) or only in a sub-length (see below). Preferably, a plurality of ribs acting as scraping elements are provided, for example three or four ribs, which are especially evenly distributed on the outer peripheral surface of the rod or mandrel head. The ribs can be constructed to be the same or different.

[0020] The axial direction is predetermined or defined by the longitudinal axis of the sleeve or the pull-out mandrel. The radial direction or the radial direction extends perpendicularly thereto. The circumferential direction can be defined as a direction following the circumferential curvature with respect to the outer circumference or lateral side of the rod or mandrel head.

[0021] The scraping element can also be constructed as a ring that is circumferential, that is, circumferential, or at least as a ring segment that is partially (circumferential) circumferential. The ring or ring segment is in particular a protrusion that is circumferential in an annular manner, and the protrusion is thicker or wider than the rib (see above). The ring or ring segment can in particular be constructed as a radial thickening or radial enlargement. Preferably, the ring or ring segment extends in the axial direction only on a sub-length of the rod or mandrel head (see below). Preferably, the outer surface of the ring or ring segment has properties that are conducive to the scraping effect, such as surface structuring. Such surface structuring is in particular a file-like surface structure, such as a sharp-edged groove (Rillung) or knurling.

[0022] The scraping element can also be constructed as a spring-elastic bow or spring bow. Such a spring-elastic bow extends from the rod or mandrel head in a radial direction and can then be deformed in a radial direction and especially against the rod when the sleeve is introduced or inserted into the rivet hole. This can especially achieve tolerance compensation (the punched rivet hole can have a relatively large hole tolerance of several tenths of a millimeter). The spring-elastic bow can be constructed as a strip element or a ring element. The outer surface of such a spring-elastic bow can have characteristics that are conducive to the scraping effect, such as surface structuring (see above). Preferably, a plurality of spring-elastic bows acting as scraping elements are provided, the bows are preferably constructed as strip elements and are especially evenly distributed and arranged on the outer peripheral surface of the rod or mandrel head. The spring-elastic bows can be constructed to be the same or different.

[0023] The above-described embodiments of the scraper element are expressly also combinable with one another.

[0024] Preferably, the scraping element, in particular the scraping element constructed as a rib, a ring or a ring segment or a spring-elastic bow, is arranged in the front (axial) end region of the rod, that is, the (axial) end region facing away from the head. Preferably, the scraping element, in particular the scraping element constructed as a rib, a ring or a ring segment or a spring-elastic bow, is only arranged in the front end region of the rod and (in particular starting from the front axial end of the rod) extends only on the sub-length or axial sub-section of the rod in the axial direction. That is, the scraping element does not extend until it reaches the head. (The same applies similarly to multiple scraping elements). Such a design may be sufficient for the specified function of the scraping element.

[0025] A plurality of head lower ribs can be arranged on the sleeve at the lower side of the head, the head lower ribs extending in particular until entering the rod. The head lower ribs can then be pressed or squeezed into the upper component or the head-side component at the latest when the sleeve is expanded by pulling the pulling mandrel, thereby achieving in particular an improvement in electrical contact and, if necessary, also a torsion protection. If ribs acting as scraping elements are provided, the head lower ribs can be arranged along the axial extension of these ribs and in particular be configured with a greater width than the ribs. The head lower ribs can also be arranged between the ribs in a staggered manner with respect to the circumferential direction.

[0026] The method according to the invention for producing an electrically conductive rivet connection between two components (this means at least two components, namely at least one first component and at least one second component) comprises the following steps:

[0027] - arranging pre-perforated or pre-drilled components, ie already provided with rivet holes or rivet openings, in such a way that substantially aligned rivet holes are produced;

[0028] - positioning the broken core blind rivet according to the invention by introducing or inserting its sleeve into the rivet hole, wherein, already during the introduction, the at least one scraping element scrapes along the hole wall and removes or scrapes away paint deposits, contaminants or the like;

[0029] The sleeve is expanded by pulling on the pulling mandrel, as is known per se from the prior art, wherein the sleeve can come to rest against the scraped hole wall and produce a good, ie low-resistance, electrically conductive contact between the sleeve and the at least one component.

[0030] Preferably, the first component is located above the insertion direction of the broken core blind rivet and the second component is located below. It is also preferably provided that the at least one scraping element removes or scrapes paint deposits, contaminants or the like located in the rivet hole at least at the lower second component.

[0031] The components are joined and electrically conductively connected in the manner explained above, wherein a very low resistance can be ensured. This means in particular that a low or low-ohmic resistance is formed both between the first component and the broken core blind rivet and between the second component and the broken core blind rivet, thereby resulting in a low or low-ohmic overall contact resistance (for example ≤5 milliohms).

[0032] The first component and the second component are preferably made of metal and / or other electrically conductive materials. At least one of the components, in particular the second component, can have a paint coating or other coating that prevents or impedes contact conduction, which is applied in particular after drilling, i.e. after introducing the rivet hole or rivet opening, and can thus at least partially cover the hole wall, without requiring pretreatment before riveting. In addition, the coating process or painting process is also simplified, because it is not necessary to cover the hole or rivet opening. It goes without saying that more than two components can also be joined and electrically conductively connected in the above manner.

[0033] Preferably, the broken core blind rivet or its shank and / or mandrel head is constructed with an interference structure (this refers in particular to a diameter interference structure) determined by the at least one scraping element relative to the rivet hole, so that the scraping effect described above can be reliably generated during introduction or installation.

[0034] Not only the introduction or the insertion but also the expansion can be automated or semi-automated, for example by means of a conventional rivet gun, as described, for example, in DE 10 2011 012 112 A1. Such a rivet gun can be moved manually or by means of a robot. Preferably, the core-broken blind rivet according to the present invention is configured so that the pressure required for introduction or insertion into the rivet hole does not exceed the introduction force or the pressing force (for example 40N to 60N) that can be generated by the tool used (for example a rivet gun). The required introduction force or the pressing force can be adapted by the design and arrangement structure of the at least one scraping element and, if necessary, by the number and distribution of a plurality of scraping elements. For this purpose, actual tests can also be implemented. The pulling force used to expand the sleeve is usually several thousand Newtons (kN). The at least one scraping element has no relevant influence on the expansion, especially no adverse influence.

[0035] The first component is in particular a ground contact-conducting device, such as a ground cable or a ground strap, which is assigned to a vehicle component, in particular a vehicle electrical component, or is electrically connected thereto. Preferably, the ground contact-conducting device has a connection end to be connected to the second component by means of a broken core blind rivet, the connection end being in particular configured as a cable clamp, a connection ring or the like. The second component is in particular a painted (vehicle) body component, which is preferably formed from a sheet metal or the like.

[0036] The broken core blind rivet according to the invention is therefore preferably used for the electrical ground connection or ground contacting of vehicle components, in particular vehicle electrical components, to painted (body) body components, in particular body parts made of sheet metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The invention is explained in more detail below with reference to the accompanying drawings in a non-limiting manner. The features described and / or shown in the drawings can also be general features of the invention independently of the specific feature combinations. In addition, the features of different implementation possibilities can also be combined into other implementation possibilities.

[0038] Figure 1 A first possible embodiment of a broken-core blind rivet according to the invention is schematically shown before insertion into a rivet hole;

[0039] Figure 2 Similar to Figure 1 A second possible embodiment of the broken-core blind rivet according to the invention is schematically shown;

[0040] Figure 3 Similar to Figure 1 A third possible embodiment of the core-broken blind rivet according to the invention is schematically shown;

[0041] Figure 4 Similar to Figure 1 A fourth possible embodiment of the core-broken blind rivet according to the invention is schematically shown;

[0042] Figure 5 A fifth possible embodiment of the broken-core blind rivet according to the invention is shown. DETAILED DESCRIPTION

[0043] exist Figure 1 The broken core blind rivet 100 shown in FIG. 1 has a sleeve 110 and a pulling mandrel 120. The sleeve 110 and the pulling mandrel 120 have a common longitudinal axis L. The sleeve 110 is configured with a shank s and a head 112. The shank 110 extends from the head 112 in the axial direction (i.e., along the longitudinal axis L). The head 112 protrudes beyond the shank 111 in the lateral direction or radial direction and forms a rivet flange. The sleeve 110 is preferably formed in one piece from metal. The pulling mandrel 120 is configured with a pin 121, which protrudes through or passes through the sleeve 110, i.e., the shank 111 and the head 112 in the axial direction. In addition, the pulling mandrel 120 is configured with a mandrel head 122, which rests on the free shank end or front face of the shank 111. The pulling mandrel 120 is also preferably formed in one piece from metal. The broken core blind rivet 100 or its sleeve 110 is also configured with a head lower rib 113. The broken core blind rivet 100 is configured substantially or at least approximately rotationally symmetrically with respect to the longitudinal axis L.

[0044] In addition, Figure 1Two components are shown, namely a (upper) first component 210 and a (lower) second component 220. These are preferably metallic components. The broken core blind rivet 100 is provided for joining and electrically conductively connecting the two components 210, 220 at the connection point or joining point shown. In other words, the broken core blind rivet 100 is provided for electrically conductive riveting of the two components 210, 220. The pre-punched components 210, 220 are oriented with respect to each other so that aligned rivet holes 300 are produced, into which the sleeve 110 of the broken core blind rivet 100 is introduced or inserted and then expanded in a manner known per se by applying an axial tensile force to the pulling mandrel (via the pulling pin 121), thereby forming a form-fitting and permanent joining connection (as described, for example, in EP3111097B1). Figure 5 as shown in ).

[0045] The (lower) second component 220 has a paint coating 221 which prevents or at least hinders direct electrical contact and which also at least partially covers or covers the hole wall. The paint coating 221 can also have a thickness of a few tenths of a millimeter on the hole wall. According to the invention, the broken core blind rivet 100 is equipped with at least one scraping element 130, which scrapes along the hole wall or the inner surface of the hole when the sleeve 110 or the rod 111 is introduced or inserted into the rivet hole 300, and at least partially removes or scrapes away possible paint deposits, contaminants or the like in the rivet hole 300 (i.e., both on the first component 210 and on the second component 220), i.e., also the paint layer 221 on the (lower) second component 220. Thus, an electrically conductive rivet connection or riveted joint with low overall contact resistance can be produced without further pretreatment of the components 210, 220, in particular without pretreatment of the underlying painted component 220, wherein the electrically conductive connection or current flow between the components 210, 220 is substantially realized via the installed or inserted broken core blind rivet 100. More than two components can also be electrically conductively riveted together using a broken core blind rivet 100 designed according to the invention.

[0046] In the broken core blind rivet 100 Figure 1In the embodiment shown in , at least one scraper element 130 is arranged on the outer circumference or lateral side of the rod 111, and the scraper element is configured as a spring-elastic bow or spring bow. Such a spring-elastic bow, which is arranged in the front end region of the rod 111 and protrudes laterally from the front axial end of the rod 111 in the direction of the head 112, is provided to scrape along the hole wall when the sleeve 110 is introduced into the rivet hole 300 and, if necessary, deform in the direction of the rod 111 or lean against the rod 111. The scraper element 130 or the spring-elastic bow can be configured as a surrounding disc spring-like ring element or annular bow, wherein a plurality of disc spring-like ring elements or annular bows spaced apart in the axial direction can also be provided. The scraper element 130 or the spring-elastic bow can also be configured as an annular bow segment or strip element that is only partially circumferential, wherein preferably a plurality of (i.e. at least two) annular bow segments and / or strip elements are arranged distributed in the circumferential direction and / or in the axial direction on the outer circumference of the rod 111. The outer surface of such a scraper element 130 configured as a spring-elastic bow can have properties that are favorable to the scraping effect, such as sharp-edged or rough surface structuring.

[0047] In the broken core blind rivet 100 Figure 2 In the embodiment shown in the embodiment, there is also provided (at least one) scraping element 130 arranged on the outer peripheral surface of the rod 111, but the scraping element is constructed as a ring that surrounds in the circumferential direction here. The outer surface of the ring that acts as a scraping element can have characteristics that are conducive to the scraping effect, especially sharp-edged or rough surface structuring. Such surface structuring is, for example, a file-like surface structure (as illustrated by the cross lines). In the axial direction, the ring can also be constructed as a relatively narrow, to a certain extent, convex (Wulst). Instead of a single surrounding ring, it is also possible to provide a ring segment that is only partially surrounded or to provide a plurality of (i.e., at least two) ring segments that are distributed and arranged on the outer peripheral surface of the rod 111 in the circumferential direction and / or axial direction. In addition, it is also possible to provide a plurality of rings that are spaced apart from each other in the axial direction.

[0048] exist Figure 1 and Figure 2In the embodiment shown in , it can be provided that the at least one scraper element 130 is arranged on the rod 111 of the sleeve 110 in such a way that after introduction or insertion, the scraper element is still at least partially inside the rivet hole 300. When the sleeve 111 is subsequently expanded (by exerting an axial tensile force on the pin 121 of the pull-out mandrel 120), the scraper element 130 can now be pressed into the hole wall or the hole inner surface and break or break off any remaining paint deposits, contamination or the like, thereby forming a particularly strong mechanical connection on the one hand and a particularly good electrical connection on the other hand.

[0049] Broken core blind rivet 100 Figure 3 and Figure 4 The implementation possibilities shown in Figure 1 and Figure 2 The difference of the embodiment shown in the embodiment is that the at least one scraping element 130, which is designed as a spring-elastic bow or as a ring or ring segment, is not arranged on the rod 111 of the sleeve 110, but on the outer circumference of the mandrel head 122 of the pulling mandrel 120. Figure 1 and Figure 2 The explanations of the possible implementations shown in apply analogously.

[0050] exist Figure 3 and Figure 4 In the possible implementation shown in , it can be provided that the at least one scraper element 130 arranged on the mandrel head 122 is also provided and correspondingly constructed so that the scraper element is pressed into the (lower) second component 220 from below to a certain extent when the sleeve 111 is compressed or expanded, thereby forming a particularly fixed mechanical connection and also a particularly good electrically conductive connection.

[0051] In the broken core blind rivet 100 Figure 5 In the embodiment shown in , a plurality of scraping elements 130 are arranged on the outer circumference of the rod 111, which are designed as radially extending ribs. The ribs extend straight in the axial direction and are conically shaped. Other variants are described above. The ribs can have a relatively small rib width in the circumferential direction, that is, they can be designed to be relatively thin (to a certain extent knife-like), so that when the sleeve 110 is introduced or inserted into the rivet hole, a combined cutting and scraping effect can occur. Unlike in Figure 1 and Figure 21, wherein the at least one scraper element 130 is formed only on a sub-length of the rod 111 in the axial direction, the scraper element 130 formed as a rib here extends over the entire axial length of the rod 111, i.e. from the front axial end of the rod 111 to the underside of the head 112. The under-head ribs 113 are arranged here in an offset manner in the circumferential direction between the scraper elements 130 formed as ribs.

[0052] Reference numerals list

[0053] 100 Broken core blind rivets

[0054] 110 sleeve

[0055] 111 strokes

[0056] 112 Head

[0057] 113 Ribs under the head

[0058] 120 pull mandrel

[0059] 121 pins

[0060] 122 spindle head

[0061] 130 scraper element

[0062] 210 First Component

[0063] 220 Second Component

[0064] 221Painting Department

[0065] 300 rivet holes

[0066] L longitudinal axis

Claims

1. A broken core blind rivet (100), the broken core blind rivet being used for conductive riveting of a first component (210) and a second component (220), the broken core blind rivet comprising a sleeve (110) having a head (112) and a rod (111) and a pulling mandrel (120) having a mandrel head (122), characterized in that: The rod (111) and / or the mandrel head (122) have at least one scraping element (130) arranged on its outer circumference, which is used to scrape along the hole wall and remove paint deposits or contaminants when the sleeve (110) is introduced into a rivet hole (300) provided for this purpose.

2. The broken core blind rivet (100) according to claim 1, characterized in that: The scraper elements (130) are designed as radially protruding ribs.

3. The broken core blind rivet (100) according to claim 1, characterized in that: The scraper element (130) is designed as a circumferential ring.

4. The broken core blind rivet (100) according to claim 1, characterized in that: The scraper element (130) is designed as a spring-elastic bow.

5. The broken core blind rivet (100) according to any one of claims 2 to 4, characterized in that The scraper element (130) designed as a rib, a ring or a spring-elastic bow is arranged in the front end region of the rod (111) and extends in the axial direction (L) only over a partial length of the rod (111).

6. The broken core blind rivet (100) according to any one of the preceding claims, characterized in that A plurality of head lower ribs (113) extending into the rod (111) are arranged on the lower side of the head (112).

7. A method for producing an electrically conductive rivet connection between a first component (210) and a second component (220) using a broken core blind rivet (100) according to at least one of the preceding claims, the method comprising the following steps: - arranging the pre-punched components (210, 220) so as to produce aligned rivet holes (300); - positioning the broken core blind rivet (100) by introducing the sleeve (110) into the rivet hole (300), the at least one scraping element (130) scraping along the hole wall and removing paint deposits or contaminants; - Expanding the sleeve (110) by pulling the pulling mandrel (120).

8. The method according to claim 7, wherein: The first component (210) is a ground contact-connecting element assigned to an electrical component of a vehicle, and the second component (220) is a painted body component.

9. Use of a broken core blind rivet (100) according to at least one of claims 1 to 6 for the electrical ground connection of an electrical vehicle component to a painted vehicle body part.

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