Abstract
This paper presents an optimum design approach of spindle-tool system for improvising the dynamic stability of cutting process. Prediction of dynamic behaviour at the tool tip is necessary in assessing the machining stability of a machine tool during design stage. Spindle-tool assembly is initially analysed by using finite element analysis with Timoshenko beam elements and tool-tip frequency response functions are obtained. In order to maximize the chatter-free region in the stability lobe diagram, an optimization study is carried-out by considering spindle parameters such as bearing locations on spindle shaft along with tool-overhang as design variables. A simulated experimental dynamic data consisting of natural frequencies and average stable depth of cut is obtained for different combinations of tool overhang and bearing span values. Based on the obtained results, the data is generalized using a feed-forward neural network model which is employed to estimate the average stable depths for the optimization module. A global meta-heuristic optimization scheme namely genetic algorithm is employed to achieve the spindle design data corresponding to maximum average stable depth of cut and it is validated with. End-milling experiments are carried-out to validate the stability states corresponding to various axial depths of cut.
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Boddu, J.R., Kotaiah, K.R., Chalapathi, P.V. et al. Optimization of design for the high precision end mill spindles to improve stability of effective cutting process. Int J Interact Des Manuf (2023). https://doi.org/10.1007/s12008-023-01526-y
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DOI: https://doi.org/10.1007/s12008-023-01526-y