A novel analytical tool is presented to assess the stability of simultaneous machining (SM) dynamics, which is also known as parallel machining. In SM, multiple cutting tools, which are driven by multiple spindles at different speeds, operate on the same workpiece. Its superior machining efficiency is the main reason for using SM compared with the traditional single tool machining (STM). When SM is optimized in the sense of maximizing the rate of metal removal constrained with the machined surface quality, typical “chatter instability” phenomenon appears. Chatter instability for single tool machining (STM) is broadly studied in the literature. When formulated for SM, however, the problem becomes notoriously more complex. There is practically no literature on the SM chatter, except a few ad hoc and inconclusive reports. This study presents a unique treatment, which declares the complete stability picture of SM chatter within the mathematical framework of multiple time-delay systems (MTDS). What resides at the core of this development is our own paradigm, which is called the cluster treatment of characteristic roots (CTCR). This procedure determines the regions of stability completely in the domain of the spindle speeds for varying chip thickness. The new methodology opens the research to some interesting directions. They, in essence, aim towards duplicating the well-known “stability lobes” concept of STM for simultaneous machining, which is clearly a nontrivial task.
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e-mail: olgac@engr.uconn.edu
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November 2005
Technical Papers
A Unique Methodology for Chatter Stability Mapping in Simultaneous Machining
Nejat Olgac,
Nejat Olgac
Mechanical Engineering,
e-mail: olgac@engr.uconn.edu
University of Connecticut
, Storrs, Connecticut 06269-3139
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Rifat Sipahi
Rifat Sipahi
Mechanical Engineering,
University of Connecticut
, Storrs, Connecticut 06269-3139
Search for other works by this author on:
Nejat Olgac
Mechanical Engineering,
University of Connecticut
, Storrs, Connecticut 06269-3139e-mail: olgac@engr.uconn.edu
Rifat Sipahi
Mechanical Engineering,
University of Connecticut
, Storrs, Connecticut 06269-3139J. Manuf. Sci. Eng. Nov 2005, 127(4): 791-800 (10 pages)
Published Online: February 15, 2005
Article history
Received:
June 18, 2004
Revised:
February 15, 2005
Citation
Olgac, N., and Sipahi, R. (February 15, 2005). "A Unique Methodology for Chatter Stability Mapping in Simultaneous Machining." ASME. J. Manuf. Sci. Eng. November 2005; 127(4): 791–800. https://doi.org/10.1115/1.2037086
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