Machining stability in high-speed drilling—Part 1: Modeling vibration stability in bending |
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Authors: | Tooraj Arvajeh Fathy Ismail |
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Affiliation: | aDepartment of Mechanical Engineering, University of Waterloo, 200 University Ave. West, Waterloo, Ont., Canada N2L 3G1 |
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Abstract: | In this work, dynamic models for chatter in drilling are developed that deal with the transverse vibration due to bending, and the axial vibration due to torsion. In the first part, a dynamic model is developed to obtain the limit of stability for the bending vibration mode. The equations of motion are formulated based on a lumped representation of the drill, and the gyroscopic effect due to the rotation of the tool is included. It is shown that, including this gyroscopic effect has a profound effect on the resulting stability lobes, especially at very high speeds; it makes the lobes wider but at the same time lowers the minimum stability boundary. In the second part of this work, a time domain simulation model is developed that combines both bending and torsion modes. This model is verified 1] using experimental cutting tests. |
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Keywords: | Drilling Chatter Bending Stability lobes |
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