Rotary-axial spindles for ultra-precision machining

By combining pressurized fluid journal bearings with a novel magnetic thrust bearing, a rotary-axial spindle design is presented to achieve both rotary motion for cutting and mm-range linear motion along the axial direction for feeding. The advantages of such rotary-axial spindles include stiffer st...

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Bibliographic Details
Published in:CIRP annals 2009, Vol.58 (1), p.323-326
Main Authors: Lu, X.-D., Paone, M.P., Usman, I., Moyls, B., Smeds, K., Rotherhofer, G., Slocum, A.H.
Format: Article
Language:English
Subjects:
Applied sciences
Bearings, bushings, rolling bearings
Drives
Exact sciences and technology
Magnetic bearing
Mechanical engineering. Machine design
Precision
Precision engineering, watch making
Spindle
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Summary:By combining pressurized fluid journal bearings with a novel magnetic thrust bearing, a rotary-axial spindle design is presented to achieve both rotary motion for cutting and mm-range linear motion along the axial direction for feeding. The advantages of such rotary-axial spindles include stiffer structure loops, fewer components, higher accuracy and resolution, and less heat generation. Our first prototype has demonstrated 9000 rpm, 600 N axial load capacity, 100 N/μm dynamic stiffness, 1 mm axial stroke, and 5 nm resolution. These are significant improvements over aerostatic spindles of comparable size.
ISSN:0007-8506
DOI:10.1016/j.cirp.2009.03.042