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Predicting the rotating tool-tip dynamics in mechanical micromachining using modal testing

Bediz, Bekir and Özdoğanlar, O. Burak (2018) Predicting the rotating tool-tip dynamics in mechanical micromachining using modal testing. In: International Congress on Machining (UTIS 2018), Antalya, Turkey

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Abstract

This study presents an experimental methodology to predict the tool-tip dynamics including rotational effects in micromachining. In this approach, the ultra-high-speed spindle dynamics (i.e. the FRF matrix at the spindle tip) at different spindle speeds are obtained experimentally. Since the modal test are performed on a rotating tool, measured response includes unwanted error motions as well as the dynamic response to the excitation. Therefore, a frequency domain filtering algorithm is designed to isolate the dynamic response. Then, the experimentally obtained spindle dynamics are coupled with the tool dynamics calculated using the spectral-Tchebychev technique to predict the tool-tip dynamics. The developed approach/methodology is demonstrated on a micro machine tool incorporating miniature ultra-high-speed spindles (with air bearings), and a tungsten carbide tool blank. The predicted tool-tip dynamics are validated by direct measurements; it is concluded that the presented unified modeling approach can be used to accurately determine the tool-tip dynamics.

Item Type:Papers in Conference Proceedings
Subjects:T Technology > TJ Mechanical engineering and machinery > TJ170-179 Mechanics applied to machinery. Dynamics
ID Code:36647
Deposited By:Bekir Bediz
Deposited On:30 Nov 2018 11:52
Last Modified:22 May 2019 14:12

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