Method and apparatus for improved heat extraction from aluminum castings for directional solidification

摘要

Method and apparatus for improving the quality and mechanical properties of an aluminum alloy engine cylinder block or other large or complex castings by providing sand molds bound with a soluble binder only at locations on said casting from which rapid cooling for directional solidification and/or improved localized mechanical properties are desired with said molds being otherwise bound at the remaining locations only with a more typical insoluble binder.