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The main goal of the present grinding concept GrindBall is to develop a manufacturing process to machine micro structures [1] on hard and brittle materials, using a spherical and shaftless grinding tool. Thereby the negative effect of cutting speed variation caused by fixed rotational axes of conventional grinding pins is reduced. Spherical tools require new technologies for contactless tool drive and positioning [2] that are able to be miniaturised to a compact machining module and fit in the workspace of small machine tools [3]. Therefore, a fluidic drive and an electromagnetic bearing system were chosen for the GrindBall module as practically contactless technologies for power transmission [4].
fluid/solid interaction, grinding tools, interfacial modelling, shear forces, two-phase flow
[1] Dornfeld, D., Min, S. & Takeuchi, Y., Recent advances in mechanical micro machining. CIRP Annals-Manufacuring Technology, 55(2), pp. 745–768, 2006. https://doi.org/10.1016/j.cirp.2006.10.006
[2] Denkena, B., Möhring, H. & Kayapinar, H., Design of a compact fluidic xy-stage for precise positioning. Proceedings of the 7th International Conference on Micro Manufacturing ICOMM2012, pp. 345–349, 2012.
[3] Wulfsberg, J., Redlich, T. & Kohrs, P., Square foot manufacturing: a new production concept for micro manufacturing. Production Engineering, 4, pp. 75–83. https://doi.org/10.1007/s11740-009-0193-x
[4] Wulfsberg, J., Kohrs, P., Grimske, S. & Röhlig, B., Square foot manufacturing: a new approach for desktop-sized reconfigurable machine tools. Future Trends in Production Engineering, pp. 201–208, 2013. https://doi.org/10.1007/s11740-009-0193-x
[5] Leach, K., Groll, R. & Rath, H., Large eddy simulation of a pneumatically powered abrading sphere. Fluid Flow Technology, 15, pp. 600–607, 2012.
[6] Brinksmeier, E., Orlik, B., Groll, R., Brandao, C., Norbach, A. & Leach, K., Grindballmodul zum achsenlosen mikroschleifen. ANT Journal, 52(2), pp. 14–19, 2013.
[7] Brinksmeier, E., Orlik, B., Groll, R., Brandao, C., Norbach, A. & Leach, K., Grindball an innovative micro-grinding tool. Production Engineering, 7(5), pp. 469–476, 2013. https://doi.org/10.1007/s11740-013-0469-z
[8] Leach, K., Modelling Force Transfer in Boundary Layers of Moving Walls for Compressible and Incompressible Turbulent Flows Across Multiple Scales (ISBN: 9783954049103). Cuvillier, 2015.