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TECHNICAL PAPERS

Manufacturability Analysis of Flatness Tolerances in Solid Freeform Fabrication

[+] Author and Article Information
Ramakrishna Arni, S. K. Gupta

Mechanical Engineering Department and Institute for Systems Research, University of Maryland, College Park, MD 20742

J. Mech. Des 123(1), 148-156 (Sep 01, 1999) (9 pages) doi:10.1115/1.1326439 History: Received September 01, 1999
Copyright © 2001 by ASME
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References

Rajagopalan, S., Pinilla, J. M., Losleben, P., Tian, Q, and Gupta, S. K., 1998, “Integrated Design and Manufacturing Over the Internet,” in Proceedings of the ASME Computers in Engineering Conference, Atlanta, GA, September.
Tumer, I., Thompson, D. C., Crawford, R. H., and Wood, K. L., 1995, “Surface Characterization of Polycarbonate Parts from Selective Laser Sintering,” in the Proceedings of the Solid Freeform Fabrication Symposium, Austin, TX. August 7–9.
Gervasi, V. R., 1997, “Statistical Process Control for Solid Freeform Fabrication Processes,” in the Proceedings of Solid Freeform Fabrication Symposium, Austin, pp. 141–148, August 11–13.
Rosen, David W., Sambu, Shiva Prasad, and West, Aaron P., 2001, “A Process Planning Method for Improving Build Performance in Stereolithography,” accepted for publication in Computer-Aided Des.
Onuh, S. O., and Hon, K. K. B., 1997, “Optimizing Build Parameters and Hatch Style for Part Accuracy in Stereolithography, in the Proceedings of Solid Freeform Fabrication Symposium, Austin, pp. 653–660, August 11–13.
Tata, K., and Flynn, D., 1996, “Quantification of Down Facing Z Error and Associated Problems,” in the Proceedings of NASUG Conference, San Diego, March 11–13.
Frank, D., and Fadel, G. F., 1994, “Preferred Direction of Build for Rapid Prototyping Processes,” in the Proceedings of the Fifth International Conference on Rapid Prototyping, Dayton, OH., pp. 191–200.
Cheng,  W., Fuh,  J. Y. H., Nee,  A. Y. C., Wong,  Y. S., Logh,  H. T., and Miyazawa,  T., 1995, “Multi-Objective Optimization of Part Building Orientation in Stereolithography,” Rapid Prototyp. J.,1, No. 4, pp. 12–23.
Pududhai, N. S., and Dutta, D., 1994, “Determination of Optimal Orientation based on Variable Slicing Thickness in Layered Manufacturing.” Technical report UM-MEAM-94-14, Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI.
Bablani,  M., and Bagchi,  A., 1995, “Quantification of Errors in Rapid Prototyping Processes, and Determination of Preferred orientation of Parts,” Trans. North Am. Manufact. Res. Inst. SME,23, pp. 319–324, May.
Thompson, D. C., and Crawford, R. H., 1995, “Optimizing Part Quality with Orientation,” Solid Freeform Fabrication Symposium, University of Texas, Austin, August.
Suh, Y. S., and Wozny, M. J., 1995, “Integration of a Solid Freeform Fabrication Process into a Feature-Based CAD System Environment, Solid Freeform Fabrication Symposium, University of Texas, Austin, August.
Ramakrishna, A., 2000, “Web-Based Manufacturability Analysis for Solid Freeform Fabrication,” M. S. Thesis, Mechanical Engineering Department, University of Maryland, College Park.
Gupta, S. K., Tian, Q., and Weiss, L., 1998, “Finding Near-Optimal Build Orientations for Shape Deposition Manufacturing,” in the Proceedings of Sculptured Surface Machining Conference, Auburn Hills, MI., October.

Figures

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Composite mathematical model
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A band on a unit sphere
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Effect of orientation on accuracy
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Building faces when the angle between the face normal and build vector is close to zero or π
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Effect of xy and z errors on the flatness error
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Effect of angle between build and face normal vectors
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Projection of a planar face on the build vector
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A simple manufacturable part showing the required flatness accuracies
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The feasibility regions for the part shown in Fig. 11
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Feasibility region for case 2 in Section 4.1.2
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Computing the value of θcr for a given value of γ
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Finding the values of xmax and xmin
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Drawing of the example part (not to scale)
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Two cases of manufacturability analysis for the example
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Set of feasible build orientations

Tables

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