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TECHNICAL PAPERS

Three-Dimensional Tube Geometry Control for Rotary Draw Tube Bending, Part 1: Bend Angle and Overall Tube Geometry Control

[+] Author and Article Information
Huazhou Lou, Kim A. Stelson

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

J. Manuf. Sci. Eng 123(2), 258-265 (Mar 01, 2000) (8 pages) doi:10.1115/1.1351813 History: Received August 01, 1999; Revised March 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Stress strain relation with reloading
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Moment vs. bend angle of a bend-rebend process
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Relaxation of a titanium tube (9.53 mm OD, 0.89 mm thickness, Ti-3Al-2.5V)
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Empirical relaxation model
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Radial growth after springback
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Tube shape deviation caused by radial growth
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Straight section offset caused by radial growth
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Histogram of the tube error of 20-120 method
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On-line measured springback vs. bend angle
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Rotary-draw tube bending
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Springback angle Δθ vs. loaded bend angle θ
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Simplified flow chart of the process control software
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Standard deviation of springback vs. bend angle
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Bent tube errors of single tube batch
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Histogram of the tube error of process control software

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