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TECHNICAL PAPERS

Influence of Unsteady Effects on Air Venting in Pressure Die Casting

[+] Author and Article Information
J. Hernández

E.T.S. de Ingenieros Industriales, UNED, E-28040 Madrid, Spaine-mail: jhernandez@ind.uned.es

J. López, F. Faura

E.T.S. de Ingenieros Industriales, Universidad Politécnica de Cartagena, E-30203 Cartagena, Spain

J. Fluids Eng 123(4), 884-892 (Jun 11, 2001) (9 pages) doi:10.1115/1.1412234 History: Received August 12, 1999; Revised June 11, 2001
Copyright © 2001 by ASME
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References

Figures

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Schematic representation of the venting system
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Validation of the computed results by comparison with the exact solution given by Eq. (16)
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Effect of the area ratio A/A on the ratio between the residual air mass in the cylinder at t/tf=0.9, as predicted by the unsteady model for c0(0)tf/L=10, and that obtained assuming quasi-steady conditions (c0(0)tf/L=500), for vacuum venting and different values of friction parameter
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Effect of vacuum pressure on the pressure ratio in the cylinder at t/tf=0.9 as a function of the vent area ratio A/Ac, predicted by the numerical model for c0(0)tf/L=500 and by the model of Bar-Meir et al. 6
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Schematic representation of a die casting machine
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Results of a grid sensitivity study for the case corresponding to the exact solution of Eq. (16)
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Effect of vent area values on pressure ratio in the cylinder for two different values of c0(0)tf/L and of the friction parameter. Case of atmospheric venting. (a) 4fL/D=0,c0(0)tf/L=5. (b) 4fL/D=0,c0(0)tf/L=50. (c) 4fL/D=5,c0(0)tf/L=5. (d) 4fL/D=5,c0(0)tf/L=50.
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Effect of vent area values on pressure ratio in the cylinder for two different values of c0(0)tf/L and of the friction parameter. Case of vacuum venting. (a) 4fL/D=0,c0(0)tf/L=5. (b) 4fL/D=0,c0(0)tf/L=50. (c) 4fL/D=5,c0(0)tf/L=5. (d) 4fL/D=5,c0(0)tf/L=50.
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Effect of friction on the pressure ratio in the cylinder, for atmospheric venting and quasi-steady conditions, and different values of the vent area ratio A/Ac
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Effect of the area ratio A/A on the mass ratio of air remaining in the cylinder at various dimensionless times, t/tf, for atmospheric venting and different values of c0(0)tf/L. (a) 4fL/D=0. (b) 4fL/D=5
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Effect of the area ratio A/A on the ratio between the residual air mass in the cylinder at t/tf=0.9, as predicted by the unsteady model for c0(0)tf/L=5, and that predicted by the model of Bar-Meir et al. 8 for atmospheric venting and different values of the friction parameter
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Effect of the area ratio A/A on the mass ratio of air remaining in the cylinder at various dimensionless times, t/tf, for vacuum venting and different values of c0(0)tf/L. (a) 4fL/D=0. (b) 4fL/D=5

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