B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
B22D 11/04 (2006.01) B22D 11/057 (2006.01) B22D 11/059 (2006.01)
Patent
CA 2264890
A method of preparing a mold surface for a continuous casting machine includes steps of machining the mold surface to a substantially smooth surface, and work hardening the machine surface substantially throughout to impart a compressive stress to the surface. In the preferred embodiment, this work hardening is performed by applying a controlled shot peening process to the mold surface. The surface may then be buffed to a smooth finish, or coated with a material such as nickel or chromium. The residual compressive stress that is created by the work hardening stops cracks from forming or spreading in the moldface wall. This increases the life of the moldface, and makes the casting machine safer and more efficient to operate.
Un procédé permettant de préparer une surface de moule destinée à une machine de coulée continue comprend l'usinage de la surface du moule, qui permet d'obtenir une surface sensiblement lisse, et le rhéo-durcissement de sensiblement toute la surface usinée, qui impose à cette dernière un effort de compression. Dans le mode de réalisation préféré, ce rhéo-durcissement se fait par application d'un grenaillage de précontrainte contrôlé à la surface du moule. La surface peut ensuite être bufflée, ce qui donne un fini satiné, ou revêtue d'un matériau tel que nickel ou chrome. L'effort de compression résiduel produit par le rhéo-durcissement empêche les criques de se former ou de s'étendre à l'intérieur de la paroi de la face du moule, ce qui augmente la durée de vie de cette dernière et rend la machine plus sûre et plus efficiente.
Ag Industries Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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