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Green Sand Metalcasting Foundry News

Review of AFS Glossary Foundry Terms: "Foundry returns" to "Patternmaker's shrinkage"

Posted by Hill and Griffith Company on Jan 8, 2019 5:25:13 PM

A review of The American Foundrymen's Society's Glossary of Foundry Terms from the "Casting Buyer's Guide"

Foundry returns - Metal in the form of gates, sprues, runners, risers, and scrapped castings of known composition returned to the furnace for remelting.
Gas porosity - A condition existing in a casting caused by the trap­ping of gas in the molten metal, or by mold gases evolved during the pouring of the casting.
Gate (ingate) - The portion of the runner where the molten metal enters the mold cavity. Other gates: bottom -any gating system by which metal enters the mold cavity at the bottom.
Green sand - Moist clay bonded molding sand.
Heat - A single furnace charge of metal to be used for pouring directly into mold cavities; a heat may be all or part of a master heat.
Heat treatment - A combination of heating and cooling operations timed and applied to a metal or alloy in the solid state in a manner which will produce desired properties.
Hotbox process - A furan resin-based process which uses heated metal coreboxes to produce cores.
Hot tear - Irregularly shaped fracture in a casting resulting from stresses set up by steep thermal gradients within the casting during solidification and too much rigidity of the core or mold material.
Inclusions - Particles of slag, refractory materials, sand or deoxida­tion products trapped in the casting during solidifica­tion.
Investment casting process - A pattern casting process in which a wax or thermop­lastic pattern is used. The pattern is invested (sur­rounded) by a refractory slurry. After the mold is dry, the pattern is melted or burned out of the mold cavity, and molten metal is poured into the resulting cavity.
Pot, ladle and foundry tool coatings
Ladle - A container for molten metal used to transfer metal from the furnace to the mold.
Locating pad - A projection on a casting that helps maintain align­ment of the casting for machining operations.
Locating surface - A casting surface to be used as a basis for measurement in making secondary machining operations.
Master pattern - The object from which a die can be made; generally a metal model of the part to be cast with process shrin­kage added.
Mechanical properties - Those properties of a material that reveal the elastic and inelastic reaction when force is applied, or that involve the relationship between stress and strain; for example, the modulus of elasticity, tensile strength, and fatigue limit. This term should not be used inter­changeably with "physical properties."
Metal lot - A master heat that has been approved for casting and given a sequential number by the foundry.
Mold - Normally consists of a top and bottom form, made of sand, metal, or any other investment material which contains the cavity into which molten metal is poured to produce a casting of definite shape and outline.
Mold cavity - The impression in a mold produced by removal of the pattern. It is filled with molten metal to form the cast­ing. Gates and risers are not considered part of the modi cavity.
Foundry Mold Coatings
Mold coating - Coating to prevent surface defects, i.e., metal penetra­tion and improve casting finish (see core wash).
No-bake process - Molds/cores produced with a resin-bonded air-setting sand. Also known as the air set process because molds are left to harden under normal atmospheric condi­tions.
Parting line - The line showing the separation of the two halves of the mold.
Pattern - The wood, metal, 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 - The taper allowed on the vertical faces of a pattern to permit easy withdrawal of pattern from the mold or die.
Pattern layout - Full-sized drawing of a pattern showing its arrange­ment and structural features.
Patternmaker's shrinkage - The shrinkage allowance made on all patterns to com­pensate for the change in dimensions as the solidified casting cools in the mold from freezing temperature of the metal to room temperature. Pattern is made larger by the amount of shrinkage characteristic of the par­ticular metal in the casting and the amount of resulting contraction to be encountered. Rules or scales are available for use.

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