FOUNDRY MOULDING

**Definition:** This place covers:

Methods, machines and materials for manufacturing moulds or cores used in a foundry; the necessary patterns, accessory devices or tools.

**Glossary:** - Vacuum sealed moulding: a moulding process wherein a heated pattern is covered with a plastic sheet; a box of loose moulding sand is placed over the pattern and a vacuum is applied to the sand which then conforms to the shape of the sheet; after casting, the vacuum is released and the loose sand falls away from the casting product - Chaplet: metal support that holds a core in place within a mould; molten metal solidifies around the chaplet and fuses it into the finished casting - Stack moulds: a composite mold made up of stacked sections, each of which produces a complete gate of castings, and poured from a central downgate. - Breaker core: a core placed in a casting mould between the feeder and the casting cavity; the core provides for a reduced feeder-to-casting contact and enables feeders easily to be broken off from the cast products - Investing a lost pattern: method of moulding using a pattern of wax, plastic, or other material which is coated by a moulding material in slurry or liquid form to be dried and hardened afterwards - Lost pattern: a pattern (or model) which is destroyed after forming the mould; this can be done by melting out (in the case of a wax pattern) or by burning during casting (in the case of a foam pattern) - Core box: a box or mould, usually divisible and metallic, in which cores are moulded - Feeder head: a reservoir of molten metal connected to a casting to provide additionnal metal to the casting, required as the result of shrinkage before and during solidification - Pattern plate: a plate foreseen with a pattern to realise at least one mould part (cope or drag); the plate can have only on one side a half pattern, able to realise cope or drag (single sided pattern) or the plate is foreseen on both sides with a half pattern, able to realise both cope and drag (double sided pattern plate or matchplate) - Stripping plate: a plate which prevents moulding material from dislodging, when removing the pattern from the mould - Sprue: the mould channel that connects the pouring basin with the runner or, in the absence of a pouring basin , directly into which molten metal is poured - Permanent moulds: moulds which are used more than once - Semi -permanent moulds: moulds of which a part is used more than once, while the other part has to be renewed after each casting cycle - Flask: a metal frame used for making and holding a refractory mould