Development of an Analytical Model for Drilling Burr Formation in Ductile Materials

[+] Author and Article Information
Jinsoo Kim, David A. Dornfeld

5100A Etcheverry Hall, Department of Mechanical Engineering, University of California, Berkeley, Berkeley, CA 94720-1740

J. Eng. Mater. Technol 124(2), 192-198 (Mar 26, 2002) (7 pages) doi:10.1115/1.1429937 History: Received August 07, 2000; Revised August 08, 2001; Online March 26, 2002
Copyright © 2002 by ASME
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Burr shapes observed in drilling metals 589. (a) Low alloy steel 4118, (b) Stainless steel 304L, (c) Titanium alloy Ti-6Al-4V, (d) Al 6061.
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Burr formation mechanisms matched with high-speed video pictures 813. (a) Uniform burr with a drill cap, (b) uniform burr without a drill cap, (c) crown burr.
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Proposed burr formation mechanism
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Measurement of drilling thrust force matched with corresponding drilling stages. (a) Steady-state drilling, (b) deformation initiated, (c) chisel edge aligned with exit surface, (d) cutting finished, (e) fracture occurred.
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Half cross-section of material beneath the drill before and after deformation
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Final burr formation and fracture
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Effects of various parameters on drilling burr size. –Burr height ------- Burr thickness.
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Comparison of burr height and thickness between experimental measurement and analysis in AISI 4118. (a) d=4 mm (b) d=7 mm ▪ Experiments _____ Analysis.
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Comparison of burr height and thickness between experiments and analysis in AISI 304L. (a) d=1.984 mm (b) d=3.968 mm ▪ Experiments _____ Analysis.




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