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TECHNICAL PAPERS

Process Design of Laser Forming for Three-Dimensional Thin Plates

[+] Author and Article Information
Jin Cheng, Y. Lawrence Yao

Department of Mechanical Engineering, Columbia University, New York, NY 10027

J. Manuf. Sci. Eng 126(2), 217-225 (Jul 08, 2004) (9 pages) doi:10.1115/1.1751187 History: Received December 01, 2002; Revised October 01, 2003; Online July 08, 2004
Copyright © 2004 by ASME
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References

Figures

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Overall strategy for determining (a) scanning paths and (b) heating condition
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Desired shape I: pillow (dimension: 140*80*0.89 mm3, magnification ×5 in thickness for viewing clarity)
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Desired shape II: saddle (dimension: 140*80*0.89 mm3, magnification ×5 in thickness for viewing clarity)
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(a) Minimal principal in-plane strain, and (b) minimal principal bending strain for the pillow shape (dimension: 140*80*0.89 mm3)
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(a) Minimal principal in-plane strain, and (b) minimal principal bending strain for the saddle shape (dimension: 140*80*0.89 mm3)
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Vector plots of minimal principal in-plane strain for (a) pillow shape, and (b) saddle shape (the orientation of segments indicates strain direction and length of segments indicates strain magnitude)
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Scanning paths normal to the minimal principal in-plane strain for (a) pillow shape, and (b) saddle shape
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FEM-determined relationship between laser power, scanning velocity and (a) minimal principal in-plane strain, and (b) minimal principal bending strain, both averaged within the heating zone equal to the laser beam size of 4 mm (1010 mild steel sheet of 0.89 mm thick)
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Heating condition (laser power level in W and scanning velocity in mm/s (indicated by sign ’ ) indicated along scanning paths and superposed on magnitude contour plots of minimalprincipal in-plane strain for (a) pillow shape, and (b) saddle shape (a quarter of plates shown due to symmetry and see Figs. 5.4a and 5.5a color scales)
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Laser formed AISI1010 steel thin plates (dimension: 140*80*0.89 mm3) (a) pillow shape, & (b) saddle shape using scanning paths and heat conditions indicated in Fig. 9.
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Comparison of top-surface geometry of formed plate (in dotted lines) and desired shape (in solid lines) for (a) pillow shape, and (b) saddle shape. The formed plates were measured by CMM.
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(a) Minimal principal in-plane strain, and (b) minimal principal bending strain for the pillow shape of thicker plate (dimension: 140*80*5 mm3)
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(a) Minimal principal in-plane strain, and (b) minimal principal bending strain for the saddle shape of thicker plate (dimension: 140*80*5 mm3)

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