On-Line Thinning Measurement in the Deep Drawing Process

[+] Author and Article Information
Moshe Berger, Eyal Zussman

Department of Mechanical Engineering, Technion—Israel Institute of Technology, Haifa 32000, Israele-mail: meeyal@tx.technion.ac.il

J. Manuf. Sci. Eng 124(2), 420-425 (Apr 29, 2002) (6 pages) doi:10.1115/1.1455644 History: Received August 01, 2000; Revised July 01, 2001; Online April 29, 2002
Copyright © 2002 by ASME
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Schematic of sheet metal deep drawing
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The admissible wall thickness from which the admissible velocity field was driven
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Experimental results of the thickness distribution along a longitudinal axis of a drawn cup, drawing ratio=2. The blank is made of copper (t0=0.5 mm,C=430 kg/mm2,n=0.31).
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The measurement configuration
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Areas of the measurement configuration
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Wave displacement along the time axis. The sensor is located in x=0, wave displacement is observed at a distance of s=3 mm (100 time unit) from the sensor, oil layer length is 3⋅d, where d is the wall thickness. C-S: wave propagates from the cup to the sensor. S-C: wave propagates from the sensor to the cup.
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Wave characterization in the measurement setup
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Deep drawing experimental setup
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Envelope of the reflected signal for different sample thicknesses (copper) t0=0.38, 0.44, 0.5, 0.53 mm
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Calibration graph relating the maximum level of the reflected signal with the sample thickness (copper). The graph presents the combined data using two sensors set at 2 and 5 MHz frequencies.
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Thickness trajectory of a manufactured part. Three measurement methods are compared: an ultrasonic sensor (based on maximum amplitude), a micrometer, and a strain grid analysis.
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Thickness trajectory of the predicted model (Ct=0.1) and in-process measurements of two groups of results labeled as Cup#1, and Cup#2, Drawing ratio=2.



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