MIL-HDBK-1897(AT)
3. DEFINITIONS
3.1 Definitions. Definitions relating to investment castings not shown here may be found in the reference documents.
3.1.1 Draft. (1) The angle or taper on the surface of a die or the parts made with it which facilitates removal of the work. (2) Taper put on the surface of a pattern so that it can be successfully withdrawn from the mold.
3.1.2 Gate (ingate). The portion of the runner in a mold through which molten metal enters the mold cavity. Sometimes the generic term is applied to the entire network of connecting channels which conduct metal into the mold cavity.
3.1.3 Investment casting. Investment casting involves pouring metal into a mold produced by surrounding (investing) an expendable pattern with a refractory slurry that sets at room temperature. After this, the wax, plastic, or frozen mercury pattern is removed through the use of heat. This procedure is also known as precision casting or the lost wax process.
3.1.4 Investment compound. A mixture of a graded refractory filler, a binder and a liquid vehicle used to make molds for investment castings.
3.1.5 Parting line. A plane on a pattern or a line on a casting corresponding to the separation between the two portions of a mold.
3.1.6 Pouring basin. A basin on top of a mold to receive the molten metal before it enters the sprue or downgate.
3.1.7 Riser. A reservoir of molten metal connected to the casting to provide additional metal to the casting, required as a result of shrinkage before and during solidification.
3.1.8 Runner. (1) A channel through which molten metal flows from one receptacle to another. (2) The portion of the gate assembly that connects the downgate, sprue or riser with the casting. (3) Parts of patterns and finished castings corresponding to the described portion of the gate assembly.
3.1.9 Runner box. A distribution box that divides the molten metal into several streams before it enters the mold cavity.
3.1.10 Sprue (downsprue, downgate). (1) The channel that connects the pouring basin with the runner. (2) Sometimes used to mean all gates, risers, runners, and similar scrap.
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