Apparatus for threading a tool unit onto an elongate structural element

An apparatus for threading a tool unit onto an elongate structural element, the apparatus comprising:

• a tool unit which is to be threaded onto the elongate structural element and which has a tool axis,
• a holding arrangement for holding the tool unit on a feed unit,
• a vibration unit which is connected to the tool unit and which is configured to generate a periodic force in at least one first spatial direction that runs transversely with respect to the tool axis, and
• an elastic coupling unit with a first coupling component and with a second coupling component, which are held elastically on one another,
• wherein the first coupling component is connected to the holding arrangement,
• wherein the second coupling component is connected to the tool unit, and
• wherein the apparatus is configured to operate the vibration unit, during a feed movement of the holding arrangement for threading the tool unit onto the elongate structural element, in order to add an additional, periodically varying transverse component to a feed force acting on the tool unit,
• wherein the elongate structural element is a rivet, and
• wherein the tool unit has a riveting tool that is configured to crimp a collar, which has been pushed onto the elongate structural element, together with the structural element.