Method for producing a riveted connection between a ball joint pin and a component in the form of a metal sheet and associated prefabricated subassembly
View Patent ↗The invention relates to a method for producing a riveted connection between a ball joint pin, having a pin longitudinal axis (BLA), and a component in the form of a metal sheet with an abutting portion surrounding a preliminary hole, in which the ball joint pin has at least one ball head portion an adjoining shank portion, a planar plate portion, having an upper side and an underside, and a rivet flange portion, in which the ball joint pin is connected to the component by deforming the rivet flange portion. Advantageously, in a first step, the ball joint pin is inserted into the preliminary hole by means of an inserting tool in such a way that the plate portion is supported at least in certain portions by its underside on the abutting portion of the component in the form of a metal sheet, preferably with surface-area contact. In a second step, the rivet flange portion, which at least in certain portions is in the form of a hollow cylinder, is subsequently deformed in a controlled manner in the direction of the component in the form of a metal sheet by of a forming tool in the form of a die, in particular a riveting punch, to produce the riveted connection.
1. A method for producing a riveted connection between a ball joint pin having a longitudinal pin axis (BLA) and a sheet metal component having a contact section that surrounds a preliminary hole, wherein the ball joint pin comprises at least a ball end section, an adjoining shaft section, a planar plate section comprising an upper side of the planar plate section and an underside of the planar plate section, and a sectionally hollow-cylindrical rivet collar section, and wherein the ball joint pin is connected to the sheet metal component by deforming the sectionally hollow-cylindrical rivet collar section, comprising the following steps in order of:
(a) joining the ball joint pin into the preliminary hole using a sleeve shaped joining tool such that there is applied a controlled application of contact force and reaction force directly to the ball joint pin by the sleeve shaped joining tool for joining the ball joint pin into the preliminary hole of the sheet metal component such that the planar plate section has the underside of the planar plate section at least sectionally supported flatly on the contact section of the sheet metal component;
(b) deforming the sectionally hollow-cylindrical rivet collar section in a direction of the sheet metal component in a controlled fashion by a beaded forming die or a riveting punch, while the ball joint pin is being held in place by the sleeve shaped joining tool, in order to produce the riveted connection, wherein an applied deformation force is applied to the sectionally hollow-cylindrical rivet collar section in a controlled fashion by the beaded forming die or riveting punch, and wherein a hollow portion of the sectionally hollow-cylindrical rivet collar section is pre-beaded by the beaded riveting punch forming a pre-beaded rivet collar section;
(c) removing the sleeve shaped joining tool; and
(d) then striking the pre-beaded rivet collar section with a processing tool to ensure that the pre-beaded rivet collar section flatly contacts an underside of the sheet metal component, wherein the sectionally hollow-cylindrical rivet collar section comprises a hollow portion and a solid portion, and the sectionally hollow-cylindrical rivet collar section is deformed without rollers in a region of the hollow portion such that an air gap remains between the sheet metal component and deformed sections of the hollow portion of the sectionally hollow-cylindrical rivet collar section and/or free ends of the sectionally hollow-cylindrical rivet collar section, and wherein the hollow portion of the sectionally hollow-cylindrical rivet collar section is outwardly deformed between 80° and 90° from the longitudinal pin axis (BLA).
2. The method according to claim 1 , wherein an applied contact force (AF) is applied to the ball joint pin in a controlled fashion at least in a region of the upper side of the plate section and/or in a region of the ball end section by the joining tool.
3. The method according to claim 2 , wherein an absolute value of the applied contact force (AF) is controlled by a spring unit or pneumatic spring unit that is functionally connected to the joining tool.
4. The method according to claim 1 , wherein an absolute value of the applied deformation force (FF) is controlled by a spring unit or pneumatic spring unit that is functionally connected to the riveting punch.
5. The method according to claim 1 , wherein the method produces a prefabricated assembly comprising a ball joint pin and a sheet metal component having a contact section surrounding a preliminary hole, wherein the ball joint pin comprises a ball end section, an adjoining shaft section, a planar plate section with an upper side and an underside and a rivet collar section, and wherein the ball joint pin is connected to the sheet metal component by deforming the rivet collar section, and wherein the rivet collar section is sectionally designed as a sectionally hollow-cylinder rivet collar section.