Experimenting Dynamics of Micro-Endmill

Burak Ozdoganlar, Mechanical Engineering

High rotational speeds and varying forces create dynamic excitations on micro-endmills during micromilling. Vibrations of micro-endmills play important role on the final accuracy of the machined feature and on the magnitude of the micromachining forces. In order to have a better control on the machining process, dynamics of micro-endmills have to be well examined.

The vibrations are simulated by modeling the micro-endmill as a rotating beam and the purpose of this project is to conduct experiments to validate the simulation results. Micro-endmills will be rotated by a high speed spindle (160,000 rpm) under Micro Laser Doppler Vibrometer (MLDV) in Prof. Ozdoganlar’s Multiscale Manufacturing and Dynamics Laboratory. Different geometries will be tested for varying rotational speeds to examine the effect of speed and geometric parameters on the vibrations. The aim of the project is to find an optimized rotational speed and geometry for the micro-endmill that will significantly reduce the vibrations during micromachining.

The results of this project can be considered during the production of the micro-endmills and during the selection of micromachining parameters, so that the effects of the micro-endmill dynamics will be controlled in order to achieve more accurate and more productive micromachining process.