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Technical Articles
(listed in alphabetical order)
A Comparison of Flow Modification through Foundry Filters using both Water Modeling and Simulation Software
Part1 By J.M. Dumaillet and G.M. Wilson Saint-Gobain Advanced
Ceramics Hamilton, Paris, Ontario, Canada
Copyright 2002 American Foundry
Society
This study is the first part of a project beeing undertaken to
establish general rules for designing a gating system with a filter. The
considered parameters include : type of alloy, filter print, filter location,filter orientation, angle between filter chamber and runner, runner height and choke location. Major observations were made using water modeling
experiments, but the use of simulation software is much quicker and more flexible, and the results can be interpreted more
clearly. After suitable
adjustments to the software parameters, most of the observations became similar
to those noted with water modeling. However, air entrapment is more obvious in
the water model and the low velocity at the chamber exit is more visible in the software simulation.
English, 12 pages, size 650 Ko
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Molten metal filters :an engineered balance
By I.A. Andrews and A.L. Matthews Hamilton Advanced Ceramics, Paris,
Ontario, Canada
Experience has shown that characteristics other than
just filtration efficiency are important properties of molten metal filters. The ability to remove inclusions is of course important, but a
filter must also have a high and consistent flow rate, good strength, a high capacity and good dimensional accuracy. This must be achieved at the lowest possible cost. The paper discusses the relative performance of the
most popular filtering technologies against each of the above parameters.The filters types considered are pressed cellular ceramics filters, extruded
cellular ceramics filters and ceramic foam filters. The paper concludes that in ductile iron, ceramic pressed cellular filters offer the best engineered
balance of the performance parameters discussed.
English, 14 pages, file size 236 Kbytes
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