Designing Optimal Gating Systems for Iron Castings


Computer simulations and an understanding of iron-specific melting characteristics can reduce time and costs related to defective castings. LARRY SMILEY AND DAVID SCHMIDT, FINITE SOLUTIONS INC., HAMILTON, OHIO


ductile) requires an understanding of how these alloys differ from others, such as steel. If these differences are not considered, feeding systems may


A


properly designed feeding system for iron castings (both gray and


be less than adequate and casting quality will suffer. In many cases, feeders designed essentially for steel castings lead to production defects when applied to iron. Such misunder- standings lead to suggested solutions that often worsen the situation.


Understanding design proper- ties specific to iron, when applied in conjunction with simulation software, can lower scrap rates and result in quality castings. Additionally, running computer simulations prior to initial production can help avoid weeks and


Figs. 1a-b. The ductile iron control arm originally was designed with two feeders. 34 | MODERN CASTING October 2013


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