A Mechanistic Force Model and Stability Analysis for Contour Turning
Reddy, Rohit Gajjela
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https://hdl.handle.net/2142/84018
Description
Title
A Mechanistic Force Model and Stability Analysis for Contour Turning
Author(s)
Reddy, Rohit Gajjela
Issue Date
2001
Doctoral Committee Chair(s)
Kapoor, Shiv G.
DeVor, Richard E.
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Industrial
Language
eng
Abstract
The stability variations in axial contour turning are investigated via a frequency domain analysis. Three-dimensional stability-limit diagrams, third dimension being the toolpath, are generated for machining a workpiece with concave-convex contours. The reasons for the stability variations along the toolpath are analyzed in terms of the overlap factor (amount of regeneration) and the cutting stiffness variations. A mechanistic model based force-feedback scheme for disturbance rejection and tracking control in radial contour turning is proposed. The stability issues for the force-feedback design are addressed and the relative tracking performance of acceleration and force feedback controllers at various levels of process parameters (depth of cut, feedrate, etc.) are analyzed.
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