bottom form, made of sand, metal or any other investment material. It contains the cavity into which molten metal is poured to produce a casting of definite shape.
Mold cavity Te impression in a mold produced by removal of the pattern. It is filled with molten metal to form the casting.
Mold coating See core wash. Nobake process Molds/cores produced with a resin-bonded, air-setting sand. Also known as the airset process because molds are left to harden under atmospheric conditions. Nodular iron See ductile iron. Normalizing A heat treatment in which ferrous alloys are heated to a suitable temperature above the trans- formation range and then cooled in still air to room temperature.
Offal Material that is trimmed off of a die-casting to separate it from the shot and/or clean the parting line.
Orientation Te position of a part or tool in a production operation.
Overaging The process of aging a nonferrous, precipitation-hardening alloy under conditions of time and temperature greater than those re- quired to obtain maximum strength and hardness.
Oxidation a) A reaction of an element with oxygen. b) Any process which increases the proportion of oxygen or acid-forming element or radical in a compound.
Parting line Te line showing the sepa- ration of the two halves of the mold.
Pattern The wood, metal, foam or plastic shape used to form the cavity in the sand. A pattern may consist of one or many impressions and would normally be mounted on a board or plate complete with a runner system.
Pattern draft See draft. Pattern injection In investment cast- ing, the process of filling the pat- tern die with expendable material, usually in the liquid or plastic state.
Pattern layout Full-sized drawing of a pattern showing its arrangement and structural features.
Patternmaker’s shrinkage Te shrinkage allowance made on all pat- terns to compensate for the change in dimensions as the solidified casting cools in the mold from freezing tem- perature of the metal to room tem- perature. Te pattern is made larger by the amount of shrinkage characteristic of the particular metal in the casting
2016 CASTING SOURCE DIRECTORY METAL CASTING DESIGN & PURCHASING 49
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