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US 4,667,727 AGranted
Method of squeeze forming metal articles
AssigneeGKN Technology Limited
InventorsJohn Barlow, David B. Rogers
Life of this patent
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Abstract
A squeeze formed aluminium alloy article, such as a piston, is formed with a re-entrant cavity (14) with reinforced edges by locating an isostatically compacted salt core (10) and annular alumina-silicate fibre pad (11) in the mould cavity of the squeeze forming press prior to introduction of the molten metal therein. The core (10) is subsequently dissolved from the squeeze formed article to provide a reinforced corresponding shape to the article which does not require subsequent machining.
Claims12
A method of manufacturing a light metal article having a formed shape therein comprising:
- placing a core and a preformed reinforcement insert adjacent and in contact with the core in a cavity of a mould prior to introduction of molten light metal into the mould;
- the core comprising a soluble salt core of a fine grained salt mixture;
- introducing molten light metal into the mould cavity, closing the mould under pressure to displace molten metal into the cavity and maintaining the metal under pressure whilst solidification thereof takes place to produce a squeeze formed light metal article having a formed shape;
- opening the mould and removing the squeeze formed light metal article having a formed shape therein;
- the formed shape being partially defined by a volume of reinforced light metal adjacent a volume of unreinforced light metal;
- both the volume of reinforced light metal and the volume of unreinforced light metal defining a common boundary which ends at an external surface of the formed shape predetermined to require reinforcement to meet operational conditions;
- and
- dissolving the core from the article.
5 more elements
Dependencies are inferred from the claim text.