Tools and Materials Research Development Innovation Projects Contract
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Hybrid spindle: Process-dependent setting of the spindle dynamics to increase productivity in machining

Various storage concepts for the hybrid spindle were initially developed and implemented in
Examined within the framework of numerical simulations with regard to the thermo-elastic behavior. The storage temperatures and thermal
Induced bearing deformations are used to design the preload element. The prestressing force is applied by the prestressing element via spring forces. A deformation of the spindle bearings leads to a change in the deflection and thus to a change in the preload force. The
adaptive prestressing element is therefore designed so that the change in prestressing force as a result
thermally induced deformations can be compensated. In cooperation with representatives from the industry, a practical maximum nominal speed of
n = 20,000 rpm and a rated motor power Pn = 60 kW. Based on the performance and
Speed ​​requirements, the dimensioning and the technical implementation of the electromagnetic active part of the motor. The biasing element and the switchable Winding systems were integrated into a V100 – S20 milling spindle from NN GmbH.
The resulting hybrid spindle was then put into a machine tool of the type NN PFV-1 integrated and experimentally investigated at the IFW. The experimental investigations include the implementation of modal analyzes and machining tests.
The steps involved in designing and testing the hybrid spindle are described in more detail below
… more in German

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