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Glossary of Casting Terms (con't)

Impregnation – The Treatment of defective castings with a sealing medium to stop pressure leaks in porous areas, using soda, drying oils, plastics, and proprietary compounds.
 
Inclusions – Impurities trapped in the casting during solidification.
 
Insert – A part, usually formed from metal, which is placed in a mold and becomes an integral part of a casting.
 
Internal Shrinkage – A void or network of voids within a casting caused by inadequate feeding of that section during solidification.
 
Investment Casting – A pattern casting process in which a wax or thermoplastic is used.  The pattern is invested by a refractory slurry.  After drying, the pattern is melted or burned out of the cavity and molten metal is then poured into the resulting cavity.
 
Jacket Mold – A wooden or metal form, which is slipped over a mold made in a snap or slip flask, to support the four sides of the mold during pouring.

Jobbing Foundry – A casting facility equipped to economically produce a single casting or in small quantities from a pattern.  The term is sometimes used to designate a commercial foundry.
 
Ladle – Metal receptacle frequently lined with refractories used for transporting and pouring molten metal.
 
Liquidus – A line on a binary phase diagram, or a surface on a ternary phase diagram, representing the temperatures at which freezing begins during cooling, or melting ends during heating.
 
Loose Piece – Core box; part of a core box which remains embedded in the core, and is removed after lifting off the core box.  Pattern; laterally-projecting part of a pattern so attached that is remains in the mold until the body of the patter is drawn.    Part of a permanent mold which remains on the casting, and is removed after casting is ejected from the mold.
 
Macrostructure – A line on a binary phase diagram, or a surface on a ternary phase diagram, representing the temperatures at which freezing begins during cooling, or melting ends during heating.
 
Mechanical Properties – Those properties of a material that reveal the elastic and inelastic reaction when force is applied. or that involve relationship between stress and strain.  Also known as physical properties.
 
Metal Lot – A master heat that has been approved for casting and given a sequential number by the foundry.
 
Misrun – A casting not fully formed.
 
Mold – The form, made of sand, metal or refractory material, which contains the cavity into which molten metal is poured to produce a casting of desired shape
 
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 mold cavity.
 
Mold Weight – A weight that is applied to the top of a mold to keep the mold from separating.
 
Molding Machine – A machine for making molds
 
Mulling – The mixing and kneading of molding sand with moisture and clay to develop suitable properties for molding.
 
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