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MidasUser.com Extradosed Bridge Design and Construction Gyumjae Bridge Project
MAGMAhpdc Gating Geometry Optimization Committed to Casting Excellence
04/18/08
Original Design ¬ The original
filling pattern is shown. ¬ The marked side of the gate fills the casting all around and then back fills the casting cavity with the last point of fill in the centre of the casting. ¬ This results in high air pressure in the casting cavity.
Original Design Air Entrapment
¬ The air
entrapment and air pressure for the original filling pattern are shown.
Air Pressure
Optimizatio n
The objective of the optimization was to minimize the maximum air pressure and the average air pressure in the casting cavity. ¬ The gating design parameters have been varied with the defined constraints to obtain the optimal design. ¬ The points in the plot shows the designs and the marked points are the optimized design with reduced air pressure ¬
Modified Design ¬ The modified
gating design created by MAGMAfronti er is shown.
Air Entrapment Air Entrapment with original design
Air Entrapment with optimized design
¬ MAGMAfrontie
r has automatically reduced the air entrapment for the design (optimized) shown.
Air Pressure Air Pressure with original design
Air Pressure with optimized design
¬ The uniform
filling pattern created by MAGMAfronti er through the casting cavity allows the air to escape through the vented overflows. ¬ The air pressure has been reduced by 100% and is now acceptable.
Conclusions and Recommendations ¬ The objective of the optimization was to minimize the
maximum air pressure and the average air pressure in the casting cavity.
¬ The gating design parameters have been varied with constraints
to obtain the objective.
¬ The filling pattern obtained with the optimized gating design is
uniform with last point of fill at the overflows.
¬ The air pressure has been reduced significantly with the
optimized design.
¬ The air entrapment in the casting cavity has been reduced and is
