Geometry Modeling and Control by Infrared and Laser Sensing in Thermal Manufacturing with Material Deposition

[+] Author and Article Information
Charalabos Doumanidis, Yong-Min Kwak

Department of Mechanical Engineering, Tufts University, Medford, MA 02155

J. Manuf. Sci. Eng 123(1), 45-52 (Mar 01, 2000) (8 pages) doi:10.1115/1.1344898 History: Received February 01, 1999; Revised March 01, 2000
Copyright © 2001 by ASME
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Thermal material transfer in layered manufacturing
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(a) Laboratory station for GMAW material deposition; (b) laser stripe optical scanner arrangement
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Arrangement of the laser scanner for geometry profile measurement
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Infrared pyrometry image of GMAW thermal field at nominal conditions
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(a) Cross section of deposited stainless steel droplet; (b) curvature along the height of deposited droplet
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Geometrical arrangement of molten puddle for lumped modeling
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Time responses of width w, height h, length I, and average temperature T during steps of source velocity to 5.1 mm/s (at 0.7 in.) and to 2.03 mm/s (at 3.2 in.) —: experimental data; [[ellipsis]]: calibrated model; ._._.: uncalibrated model
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Closed-loop geometry control system of material deposition
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Deviation between reference (Zd) and measured (Z) bead profile
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Closed-loop width and height responses, and torch velocity commands in following a reference profile Zd generated by step changes of source speed vd— : Reference —: Experimental data [[dashed_line]]: Model predictions [[dot_dash_line]]: Off-line control



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