Aspects of Surface Generation in Orthogonal Ultraprecision Machining

Lucca, D.A.; Seo, Y.W.; Rhorer, Richard L.; Donaldson, R. R.

doi:10.1016/s0007-8506(07)62160-x

Cited by 46 publications

(25 citation statements)

References 13 publications

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“…As f 2 /r n is the uncut chip thickness at the part of the cutting edge where the feed mark peaks are created [4], the inequality suggests a critical uncut chip thickness to cutting edge radius ratio at the finished surface, %0.15, below which edge sharpness determines finish. 0.15 is within the range of critical uncut chip thickness to cutting edge radius ratio for transitions from cutting to ploughing in precision orthogonal cutting studies [13][14][15][16].…”

Section: Discussionmentioning

confidence: 71%

Surface finishes from turning and facing with round nosed tools

et al. 2008

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Section: Discussionmentioning

confidence: 71%

Surface finishes from turning and facing with round nosed tools

et al. 2008

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“…The force in case E8 is typically double that of E1. This follows logically, but when the material removed gets extremely small, such as single atoms, some have predicted that this trend of decreased force with decreased material will not necessarily hold due to the atomic interactions not seen in large-scale milling [15][16][17].…”

Section: Cutting Force Measurementsmentioning

confidence: 99%

Command shaping control for micro-milling operations

Fortgang

Singhose

Márquez

et al. 2011

Int. J. Control Autom. Syst.

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Micro milling requires both high speed and high accuracy in order to economically produce parts with features on the scale of 1 µm. Micro mills are smaller and more flexible than traditional large-scale machines. Therefore, vibration of the machine structure is a significant problem. Given that micro milling requires high positioning precision, even small vibrations in the controller dynamics are problematic. The small-scale operation has considerably lower tool/workpiece interaction forces than traditional-scale milling. These low cutting forces have minimal effect on the machine structural response. Therefore, the dominant dynamic factor in exciting vibration can be the machine tool motion, rather than the workpiece/tool interaction. Given this realization, properly shaping the motions of the micro mill is a promising approach to reduce vibration. This paper presents a nonlinear commandshaping technique to reduce the vibrations of a micro mill that can be implemented with a standard CNC controller. The robustness of this technique to modeling errors and disturbances is investigated. Theoretical proofs and experimental demonstrations of the command-shaping technique are presented. The improved performance from the command shaping enables higher throughput and improved accuracy of the micro mill.

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“…Below the critical value, large increases in specific forces have been measured [2,3]. Changed surface appearances from clean cut to burnished have been reported [4,5]. Experimental and theoretical studies have indicated the critical value of a c /r e to be between 0.1 and 0.5, depending on material machined and cutting conditions [6,7].…”

Section: Introductionmentioning

confidence: 99%