Mold with roughened surface for casting metals

Details Mold with roughened surface for casting metals Mold with roughened surface for casting metals

B - Operations, Transporting

22

D

22/126

B22D 15/00 (2006.01) B22D 11/06 (2006.01)

Patent

CA 1143922

ABSTRACT OF THE DISCLOSURE A mold provided with a roughened surface for cast- ing metals is so that, on first contact of the mold with the melt, heat transfer is controlled in such a way that the melt comes into contact only with the peaks of the projections on the mold surface and an air gap is formed between the melt and the valleys on the surface. The pattern of roughness on the mold surface comprises a uniform arrangement of pyrimidal or blunted-cone shaped projections. Neighbouring projections are spaced a distance d of 0.05 to 1 mm apart and have a height h of 0.1 d --<-- h --<-- d. The pyramid or blunted cone surfaces f satisfy the condition 0.05 --<--f/d2--<--0.5. A process which does not involve deformation is preferred for producing the rough pattern, for example, a photochemical etching process. The molds are suitable for many casting processes, in particu- lar for continuous D.C. ingot or strip casting with moving molds and caterpillar track type mold belts.

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