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TECHNICAL PAPERS

Modeling of Air Venting in Pressure Die Casting Process

[+] Author and Article Information
A. Nouri-Borujerdi

School of Mechanical Engineering, Sharif University of Technology, P.O. Box 11365-9567, Tehran, Irane-mail: anouri@sharif.edu

J. A. Goldak

Carleton University, Mechanical and Aerospace Engineering Department, Ottawa ON K1S 5B6, Canadae-mail: jgoldak@mrco2.carleton.ca

J. Manuf. Sci. Eng 126(3), 577-581 (Sep 07, 2004) (5 pages) doi:10.1115/1.1767187 History: Received October 01, 2002; Revised January 01, 2004; Online September 07, 2004
Copyright © 2004 by ASME
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References

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Yoshiaki, Yamamoto, and Yasushi Iwata, 1989, “Molten Metal Velocities and Gas Pressure in Die Cavity and Defects in Commercial Aluminum Pressure Die Casting,” 15th International Die Casting Congress and Exposition, paper No. G-T 89-081, St. Louis.
Koichi,  Tanaka, and Kazuhiko,  Terashima, 1993, “Metal Filling Behavior During Die Casting under the Reduced Pressure,” Foundry Trade J., 65, pp. 277–283.
Lee, Wing-Bun, 1976, “The High Pressure Die Casting of Quality Thin-Wall Components,” Dissertation, Brunel University.
Li, Xianchen, 1990, “On the Filling Theory and Porosity Forming in Die Casting, Trends of Die Casting,” Shanghai Die Casting Society, pp. 3–4.
Bar-Meir,  G., Eckert,  E. R. G., and Goldstein,  R. J., 1997, “Air Venting in Pressure Die Casting,” ASME J. Fluids Eng., 119, pp. 473–476.
Draper,  A. B., 1996, “Effect of Vent and Gate Area on the Porosity of Die Casting,” Transactions of American Foundrymen’s Society, 75, pp. 727–734.
Lindsey, D., and Wallace, J. F., 1972, “Effect of Vent size and Design, Lubrication Practice, Metal Degassing, Die Texturing and Filling of Shot Sleeve on Die Casting Soundness,” Transactions 7th SDCE International Die Casting Congress and Exposition, Chicago, paper 10372.
Lee,  W. B., and Lu,  H. Y., 1999, “Modeling of Air Back Pressure in Die Casting Dies,” J. Mater. Process. Technol., 91, pp. 264–269.
Karni, Y., 1991, “Venting Design in Die Casting: An Analytical Approach,” NADCA Congress and Exposition, Detroit, MI, paper G-T91-OC2.
Sachs, B., 1952, “An Analytical Steady of the Die Casting Process,” Ph.D Thesis, Columbia University, USA.
Veinik, A. I., 1962, “Theory of Special Casting Method,” ASME, New York.
Veinik, A. I., 1966, “Thermodynamic Factor in Metal Injection: Effect of Friction on Gas Content and Quality,” Transactions of the 4th SDCE International Die Casting, Exposition and Congress, Cleveland, Ohio, paper 103.
Bennett, C. H., 1990, “Venting-The Die Casting Machine Becomes an Air Compressor,” Die Casting Engineering, 22–26.
Lui,  Y. B., Lee,  W. B., and Ralph,  B., 1996, “A Reclassification of the Die Filling Stages in Pressure,” J. Mater. Process. Technol., 57, pp. 259–265.
Kaye, A., and Street, A., 1982, Die Casting Metallurgy, Butterworth Scientific, London, p. 213.
Allsop, D. F., 1983, Pressure Die Casting, Part 2: The Technology of the Casting and the Die, Pergamon Press, Oxford, pp. 45–48.
Oosthuizen, P. H., and Carscallen, W. E., 1997, Compressible Fluid Flow, The McGraw-Hill Companies, Inc., New York.
Bar-Meir,  G., Eckert,  E. R. G., and Goldstein,  R. J., 1996, “Pressure Die Casting: A Model of Vacuum Pumping,” ASME J. Manuf. Sci. Eng., 118, pp. 259–265.

Figures

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The schematic of a die casting system with an air vent
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The Mach numbers at the inlet and outlet of the vent vs. time
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The air pressure in the cylinder cavity vs. time
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The air pressure and residual air mass in the cylinder cavity vs. area at time t*=0.9
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The residual air mass in the cylinder cavity vs. time
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The vent fanning friction factor vs. time
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The vent fanning friction factor vs. time for DH=0.2 mm
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The vent fanning friction factor vs. Reynolds number for DH=0.2 mm

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