Kinematic Characterization of Chip Lateral-Curl—The Third Pattern of Chip Curl in Machining

[+] Author and Article Information
Ning Fang

Department of Mechanical and Aerospace Engineering, Utah State University, Logan, Utah 84322-4130

J. Manuf. Sci. Eng 124(3), 667-675 (Jul 11, 2002) (9 pages) doi:10.1115/1.1468225 History: Received February 01, 2001; Revised November 01, 2001; Online July 11, 2002
Copyright © 2002 by ASME
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Two patterns of chip curl in machining: (a) up-curl and (b) side-curl. A certain amount of chip side-flow is involved in both patterns.
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The third pattern of chip curl in machining: lateral-curl
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Essential difference between (a) chip lateral-curl and (b) chip-twisting. VAl and VA2 are two components of the chip velocity at point A. VB1 and VB2 are two components of the chip velocity at point B.
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Establishment of the coordinate system
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Vectors used in the analysis of chip kinematics
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Three geometric parameters to define the form of a helical chip
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Procedure for measuring the chip lateral-curl radius
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Chips generated at different feed rates in the cutting tests. The feed rate f is in mm/rev.
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Comparisons of the chip curl radii
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Effects of the chip lateral-curl radius Rl on (a) the resultant radius R of chip curl, (b) the pitch P of the helix, and (c) the inclined angle θ of the helical axis to the helical surface. The chip up-curl radius Ru keeps 10 mm, side-curl radius Rs keeps 30 mm, and side-flow angle ηs keeps 15 deg.
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Computer-simulated chip forms: (a) Rl=20 mm, (b) Rl=30 mm, (c) Rl=60 mm, and (d) Rl=1000 mm. The chip up-curl radius Ru=10 mm, side-curl radius Rs=30 mm, side-flow angle ηs=15 deg,thickness=1.5 mm, and width=8 mm.
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Evaluation of Nakayama’s equations
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Comparisons of (a) the chip up-curl radius and (b) the chip side-flow angle




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