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TECHNICAL PAPERS

Influence of Exit Surface Angle on Drilling Burr Formation

[+] Author and Article Information
Sangkee Min, David A. Dornfeld

Department of Mechanical Engineering, University of California, Berkeley, CA 94720-1740

Yohichi Nakao

Department of Mechanical Engineering, Kanagawa University, 3-27-1 Rokkakubasi, Kanagawa-ku, Yokohama, 221-8686, Japan

J. Manuf. Sci. Eng 125(4), 637-644 (Nov 11, 2003) (8 pages) doi:10.1115/1.1596573 History: Received December 01, 2002; Online November 11, 2003
Copyright © 2003 by ASME
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References

Figures

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Definition of an exit surface angle, α
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Difference in burr formation on a normal and an angled exit surface: uniform burr (a) and crown burr (b) of AISI 304L on normal surface and partial burr (c,d) of Aluminum 5052 on angled surface
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Burr shapes by different inclination angles and drill 2
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Definition of the exit angle in milling
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New definition of the interaction angle in milling
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Definition of the interaction angle in drilling
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Interaction angle on upward exit surface
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Small exit surface angle
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Coordinate systems and vectors of the point P at the primary cutting edge
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The surface vector of the point Q at the secondary cutting edge
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The trajectory of the cutting edges at the 30° angled exit surface
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Variation of the interaction angle at the 30° angled exit surface
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Influence of feed on the interaction angle (Speed: 1000 rpm, exit surface angle: 30°)
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Influence of speed on the interaction angle (Feed: 100 mm/min, exit surface angle: 30°)
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Influence of the exit surface angle on the interaction angle (Feed: 100 mm/min, Speed: 1000 rpm)
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Variation of the pivoting point
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Definition of the effective exit surface angle
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Variation of the effective exit surface angle at the 30° angled exit surface
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Likely burr forming area
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Burr location measurements (Speed: 1000 rpm, Exit surface angle: 30° Drill: straight shank twist drill with 6 mm diameter, 118° point angle, 32° helix angle, workpiece: Aluminum 5052)

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