guest ::
%0 Thesis %A Eckel, Hans-Martin %T Kinematische Analyse von Spindellagern unter statischen und dynamischen Kräften; 1. Auflage %V 2024,20 %I RWTH Aachen University %V Dissertation %C Aachen %M RWTH-2024-07913 %@ 978-3-98555-226-9 %B Ergebnisse aus der Produktionstechnik %P 1 Online-Ressource : Illustrationen %D 2024 %Z Druckausgabe: 2024. - Auch veröffentlicht auf dem Publikationsserver der RWTH Aachen University %Z Dissertation, RWTH Aachen University, 2024 %X In modern main spindles, the bearings are subjected to high loads due to high machining forces and speeds. The calculated design of the spindle bearings with regard to their mechanical and kinematic loads indicates the load limits of the spindle. The analysis of ball kinematics with the methods of quasi-static rolling bearing calculation used in practice is still associated with high uncertainties. The calculated kinematics often limits the specifiable load on the spindle and thus its permissible performance due to the so-called ball advance and retardation. Observations from practice, on the other hand, often show reliable operation, even with loads that are not permitted by the calculation. This research work therefore analyzes experimentally and simulatively the load on spindle bearings as well as the resulting ball kinematics under practical load parameters as a contribution to an improved bearing design. For a holistic analysis of the spindle bearing loads, various measuring systems are presented with which the load acting on the bearing and the orbital movement of the balls and the cage can be recorded. The system for measuring the orbital ball movement is a central new development. This system is based on the principle of a light barrier using the transmitted light method, in which the balls switch the light barrier. Several sensors arranged around the bearing circumference allow continuous monitoring of the ball movement even at high rotational speeds. The good integrability of the measuring systems enables them to be used in test benches and main spindles for measurement under practical loads. In the methodical part, calculation methods are presented that determine the load in the bearings based on the measured shaft displacement. For this purpose, the measured shaft displacement is projected onto the bearings using a spindle model with an elastic shaft, taking dynamic vibration modes into account. The resulting loads in the rolling contacts of the bearings are determined using the methods of quasi-static rolling bearing calculation. These loads serve as input variables for a dynamic calculation approach that considers the kinematics and kinetics of the balls as well as the shear forces that can be transmitted via the lubricant. This enables the calculation of varying ball speeds under the influence of radial and moment loads. The application of the measuring systems and calculation methods in the experimental part shows the development of the ball advance and retardation under numerous load parameters in test rigs and main spindles. Contrary to the calculation approaches according to the quasi-static design, the measured ball speed shows a significantly lower modulation, so that the ball advance and retardation are also significantly lower than predicted. The developed dynamic method, on the other hand, describes the ball speed with improved accuracy. Dynamic loads show no significant influence on the formation of ball speeds either in the test rig or in the spindle during machining. %F PUB:(DE-HGF)11 ; PUB:(DE-HGF)3 %9 Dissertation / PhD ThesisBook %R 10.18154/RWTH-2024-07913 %U https://publications.rwth-aachen.de/record/991821