Robust Feedrate Selection for 3-Axis NC Machining Using Discrete Models

[+] Author and Article Information
B. K. Fussell, R. B. Jerard, J. G. Hemmett

Department of Mechanical Engineering, University of New Hampshire, Durham, NH 03824

J. Manuf. Sci. Eng 123(2), 214-224 (Jun 01, 2000) (11 pages) doi:10.1115/1.1365398 History: Received January 01, 1999; Revised June 01, 2000
Copyright © 2001 by ASME
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Coordinate definition and cut geometry for ball end milling during ascending cut
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Geometric model with toolpath envelope
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ymin and ymax are saved for each of the four quadrants of each disc. A tooth of a tool rotating in the clockwise direction will enter at the points labeled 1, 3, 5, 7 and exit at 2, 4, 6, 8.
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Entrance and exit angle calculation errors resulting from the discrete z direction vector spacing (slot cut)
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Flowchart of feedrate selection
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Experimental cutting force and feed velocity for sine surface
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Bottle mold during semi-finish cutting with a 12.7 mm ball-end mill, and after the finish pass
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Comparison of experimental and simulation (desired) peak resultant cutting force for roughing and finishing of the oil bottle mold
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World and local coordinate system definitions
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The ZDV is intersected by the swept envelope of the tool at P1
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Swept envelope of the tool clips ZDV at p1, and removing segment p1−p2
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Projection of p1 and p2 onto the tool determines the location of p3 and p4. Segment p3-p4 is contact area between the tool and the workpiece material represented by this ZDV.
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Determination of upper and lower z values for the contact area of the tool




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