Spindle

Description

An electromagnetically supported machine tool spindle is available at the LSR, which was specially designed for research at the chair. This was possible because the chair holder had been working together with the supplier for more than ten years to improve the possible uses of such spindles for the precision machining of metals and brittle-hard materials. From a technological point of view, increasing the positioning accuracy, expanding the range of functions and reducing costs were central concerns.

By using modern theoretical control methods (in particular flatness-based control) and by suitable mathematical modeling of the magnetic actuators and the magnetically supported spindle rotor, the highest accuracy requirements in the industrial production of engine pistons are now reliably met.

A large number of different magnetic bearing concepts have already been examined and developed as part of previous investigations: purely electromagnetic radial bearings, radial bearings supported by permanent magnets, various axial bearings and combined radial-axial bearings. With the help of the mathematical models of the magnetic bearings, a real-time reconstruction of the process force acting on the spindle can be realized in order to carry out a force-controlled feed movement or a process, tool and spindle diagnosis. The algorithms developed for this are now being further improved.