Abstract
Detachable and highly loadable screw connections can only be realized in thin-walled components and in particular hollow profiles with great effort. The flow drilling technology and subsequent thread forming represents an economical and technically interesting manufacturing alternative. With Flow drilling, a bush is generated by a fast-rotating carbide taper mandrel and a high resistant internal thread can be produced in a subsequent manufacturing process. Conventional weldor rivet nuts can be replaced in many application areas.
Highlights
Detachable and highly loadable screw connections can only be realized in thin-walled components and in particular hollow profiles with great effort
Either the material thickness of the hollow profile is increased to such an extent that a sufficient number of load-bearing threads can be inserted into the existing wall, or blind rivet nuts are used
In the flow drilling technology, a fast-rotating carbide taper mandrel is pressed onto the thin-walled component or sheet metal under axial force or with a feed movement
Summary
In many areas of mechanical and plant engineering, aviation and the construction industry, designers and production engineers are confronted with the task of connecting components and structural components. For thin-walled components such as sheet metal constructions, the use of screw-nut connections is possible, provided that both sides are accessible for assembly. Either the material thickness of the hollow profile is increased to such an extent that a sufficient number of load-bearing threads can be inserted into the existing wall, or blind rivet nuts are used. Increasing the wall thickness of the hollow profile increases the material costs and the component weight This method represents a truly economic solution only to a very limited extent. Depending on the component and assembly requirements, it is possible to clamp the blind rivet nut with the hollow profile together with the screw assembly. For thin-walled components and in particular for hollow profiles, the flow drill technology is an economical alternative for producing a sheet metal pull-through and subsequent thread forming!
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