Process for joining a hollow shaft and elements slid thereon

A process for producing a connection at ambient temperature between a hollow shaft and design elements, comprising the steps of:

• providing a hollow shaft;
• providing the design elements, each of said design elements having an aperture with a circumferential surface which corresponds to an outer diameter of the hollow shaft;
• sliding the design elements onto the hollow shaft;
• eliminating oxide layers on a surface of the aperture of the design element and an outer surface of the hollow shaft by one of machining said oxide layers, applying a reducing atmosphere to said oxide layers, and applying a reducing bath to said oxide layers;
• and
• hydraulically expanding the hollow shaft, thereby plastically deforming said hollow shaft and causing permanent elastic pretension in a surface layer of the circumferential surfaces of the apertures of the design elements, said design elements being deformed only elastically, said expanding step including increasing the hydraulic pressure depending on the condition of corresponding surfaces of the apertures of the design elements and on the hollow shaft to such an extent that permanent laminar adhesion forces between the surface layer of the aperture of the design element and the plastically deformed hollow shaft are effected without the use of constraining dies, thereby joining said design elements to said hollow shaft.