Analysis of Feed Errors in Tapping by Contact Stress Model

[+] Author and Article Information
Ajit Pal S. Dogra, Richard E. DeVor, Shiv G. Kapoor

Department of Mechanical & Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

J. Manuf. Sci. Eng 124(2), 248-257 (Apr 29, 2002) (10 pages) doi:10.1115/1.1454107 History: Received July 01, 1999; Revised September 01, 2001; Online April 29, 2002
Copyright © 2002 by ASME
Topics: Force , Thrust , Stress , Errors , Thread , Torque
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Johnson,  E., 1950, “Some Experiments on Tapping,” Proc. Inst. Mech. Eng., 162, p. 412.
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Combined model simulations for two levels of underfeed
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Experimental vs. simulated tapping forces (mechanistic model)
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Experimental vs. simulated tapping forces (mechanistic model)
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(a) Tap cross-section (b) tap tooth position in the ideal case and (c) the overfeed case
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Load distribution between the tap teeth and the workpiece thread due to overfeed
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Elastically loaded half-space with both normal and tangential forces
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Deformed elastic half-space due to quadratic stress distribution
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Contour plot of octahedral stress distribution in the loaded half-space
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Combined model simulations for different levels of tap under and over feed rates
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Validation results for aluminum 356, tap size M8×1.25
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Experimental and simulated forces for gray cast iron, tap size 7/16 in.-14, ideal feed rate, spindle speed 500 rpm
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Different types of relief angles provided on tap teeth
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(a) Tap cross-section (b) effect of the tap feed error on the contact region conventional tap tooth (c) tap with relief on the tooth flank



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