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TECHNICAL PAPERS

Analysis of the Flow in a High-Pressure Die Casting Injection Chamber

[+] Author and Article Information
J. Hernández

Departamento de Mecánica ETSII, UNED, E-28040 Madrid, Spaine-mail: jhernandez@ind.uned.es

J. López, F. Faura

Departamento de Ingenieriá de Materiales y Fabricación, ETSII, Universidad Politécnica de Cartagena, E-30202 Cartagena, Spain

P. Gómez

Departamento de Mecánica, ETSII, UNED, E-28040 Madrid, Spaine-mail: pgomez@ind.uned.es

J. Fluids Eng 125(2), 315-324 (Mar 27, 2003) (10 pages) doi:10.1115/1.1538627 History: Received November 28, 2001; Revised September 18, 2002; Online March 27, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic representation of the injection chamber of a die casting machine
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Schematic representation of the problem and coordinate system
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Characteristic curves and flow regions in the x-t–plane
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Relative grid refinement error of Eq. (12) as a function of dimensionless grid size Δx/L, in different chamber sections and at tc0/L=1.08(f=0.25,ξ=3 and L/β=9.46)
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Schematic representation of the computation grid in the injection chamber
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Dependence of computed wave surface profiles on grid size. Plunger speed law of Eq. (9), with L/l=0.8, and f=0.254.
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Dimensionless water front location as a function of dimensionless time during the collapse of a water column. Comparison between Wrafts results and other numerical and experimental results.
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Free-surface profiles at different instants during the collapse of a water column with a width/height ratio of 10 (the vertical scale has been enlarged by a factor of 15)
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Comparison between analytical and computed wave-surface profiles for the plunger speed law of Eq. (9). (a) l/H=9,f=0.254, (b) l/H=9,f=0.5, (c) l/H=3,f=0.254, (d) l/H=3,f=0.5. The vertical scale has been enlarged by a factor of 6.5 in (a) and (b), and 2.2 in (c) and (d). The time has been made dimensionless with the time required to fill a chamber with L/l=1.
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Comparison between results for the wave profiles obtained with the shallow-water model and from the CFD model, for the time-exponential plunger speed law with different values of ξ, and the conditions described in the text. (a) f=0.25, (b) f=0.4.
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Wave profiles for the plunger speed law of Eq. (9) and different values of L/l. (a) f=0.254, and (b) f=0.4.
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Dimensionless area occupied by the air when the molten metal reaches the gate to the die cavity and dimensionless filling time as a function of L/β, for the plunger speed law of Eq. (7), L/H=9,f=0.25 and different values of ξ. The vertical dashed lines indicate the optimum conditions predicted by the shallow-water model when wave reflection effects are not taken into account, 4.
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Dimensionless area occupied by the air when the molten metal reaches the gate to the die cavity and dimensionless filling time as a function of L/β, for the plunger speed law of Eq. (7), L/H=9,f=0.4 and different values of ξ. The vertical dashed lines indicate the optimum conditions predicted by the shallow-water model when wave reflection effects are not taken into account, 4.
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Dimensionless area A/(HL) as a function of L/l for the plunger speed law of Eq. (9) and different values of the initial filling fraction

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