Chemical milling apparatus and method

C - Chemistry – Metallurgy – 23 – F

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Details

C23F 1/04 (2006.01) C23F 1/08 (2006.01)

Patent

CA 2193998

A method of chemical milling which includes the following steps: (i) suspending an extrusion or casting formed from metal in an etching solution wherein initially the extrusion or casting is fully submerged in the etching solution by virtue of its weight and which thereafter is rendered buoyant by metal being removed from the extrusion or casting by the etching solution wherein the casting or extrusion is supported by a non-buoyant support which maintains the casting or extrusion in a fully submerged condition throughout its immersion in the etching solution; and (ii) withdrawing the extrusion or casting from the etching solution when required. The invention also refers to chemical milling apparatus for use in the abovementioned method as well as the non-buoyant support per se.

La présente invention concerne un procédé d'usinage chimique se décomposant en plusieurs étapes. (i) Une pièce d'extrusion ou de fonte réalisée à partir d'un métal est suspendue dans une solution d'attaque chimique en immergeant complètement la pièce par gravité dans ladite solution d'attaque chimique. Une fois que la solution d'attaque a éliminé le métal de la pièce d'extrusion ou de fonte, la pièce devient capable de flotter. Ladite pièce d'extrusion ou de fonte est retenue au moyen d'un support incapable de flotter, ce qui permet de maintenir la pièce d'extrusion ou de fonte totalement immergée pendant toute la période d'immersion dans la solution d'attaque chimique. (ii) Au moment opportun, la pièce d'extrusion est sortie de la solution d'attaque chimique. L'invention concerne également un dispositif d'usinage chimique mettant en oeuvre ledit procédé ainsi que le support incapable par nature de flotter.

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