Determination of Friction Condition by Geometrical Measurement of Backward Extruded Aluminum Alloy Specimen

[+] Author and Article Information
Yong-Taek Im, Jae-Seung Cheon, Seong-Hoon Kang

Computer Aided Materials Processing Laboratory, Department of Mechanical Engineering, ME3227, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Taejon 305–701, KOREA

J. Manuf. Sci. Eng 124(2), 409-415 (Apr 29, 2002) (7 pages) doi:10.1115/1.1445151 History: Received November 01, 2000; Revised July 01, 2001; Online April 29, 2002
Copyright © 2002 by ASME
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Simulation results of clutch-hub forming: (a) formation of radial tip in the extruded end and definition of radial tip distance and (b) linear relationship between radial tip distance and shear friction factor 16
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Simulation conditions and deformation results for (a) conventional and (b) the proposed backward extrusion set-ups
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Plot of load vs. radial tip distance obtained from experiments using various lubricants
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Change of radial position of the tip from the side wall according to the punch travel for various shear friction factors
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Simulation results for mf=0.2 showing the states of deformation and effective strain distributions at punch strokes of (a) 6.5 mm and (b) 8.0 mm
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Change of radial tip distance using fixed mfd with varying mfp and fixed mfp with varying mfd
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(a) Cross-sectional diagram and (b) photo of the proposed backward extrusion die-set
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Dimensions of the punch used in the current die-set (in mm)
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The deformation behavior in the proposed backward extrusion process: (a) initial workpiece set-up, (b) barrelling of workpiece, and (c) formation of the radial tip
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Photo of deformed shapes of workpiece at various punch strokes for the proposed backward extrusion process
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Measurement of radial tip distance, d
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Experimental results of radial tip distance for various lubricants
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Experimental results of maximum load for various lubricants
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Tip distance, d, from experiments using lubricants of (a) grease, (b) industrial oil grade VG22, and (c) WD40
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Load-stroke curves from experiments using various lubricants



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