B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/126, 22/56
B22D 23/00 (2006.01)
Patent
CA 1108373
ABSTRACT OF THE DISCLOSURE Method and apparatus for casting a metal article in a mold at least as long as the article, utilizing a cooled mold of elongated form having top and bottom portions. The method includes the steps of introducing molten metal from a source through the bottom portion of the mold, flowing molten metal into the mold so as to form a solidifying casting shell which during casting occupies at least 40% of the cross-sectional mold area and has a molten core, and flowing molten metal from the source through the core towards the mold top. The rate of solidification is effectively governed, thereby avoiding the undesirable growth of columnar dendrites which result in localized solute con- centrations, segregated inclusions and centerline porosity, all undesirable in a casting micro-structure.
307074
Macrae & Co.
Technicon Instruments Corporation
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