Dynamics of Machine Tool Spindle/Bearing Systems Under Thermal Growth

[+] Author and Article Information
Bert R. Jorgensen, Yung C. Shin

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Tribol 119(4), 875-882 (Oct 01, 1997) (8 pages) doi:10.1115/1.2833899 History: Received February 23, 1996; Revised October 28, 1996; Online January 24, 2008


Increased use of high-speed machining creates the need to predict spindle/bearing performance at high speeds. Spindle dynamic response is a function of the nonlinear bearing stiffness. At high speeds, thermal expansion can play an important role in bearing stiffness. A complete bearing load-deflection analysis including thermal expansion is derived and is coupled with an analysis of spindle dynamic response. Steady-state temperature distribution is found from heat generation at the contact point and from a quasi three-dimensional heat transfer model. Numerical solutions give a good prediction of thermal growth and heat generation in the bearing. Predicted high-speed spindle frequencies show good agreement with experimentation. The effects of loading condition and bearing material type on bearing stiffness are also shown.

Copyright © 1997 by The American Society of Mechanical Engineers
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