Fig. 3. Cores are placed into a mold.
Continuous casting A process in which molten metal is continuously solidified while being poured through a water- cooled mold; castings can be sawed off at any desired length.
Cope Te top half of a horizontally-parted mold. Core A sand or metal insert in a mold to shape the interior of
Core assembly A substructure made from a number of cores. Corebox Te wooden, metal or plastic tool used to produce cores. Coreprint A projection on a pattern that leaves an impression in the mold for supporting the core.
the casting or that part of the casting that cannot be shaped by the pattern (Figs. 2 and 3).
Core wash A liquid suspension of a refractory material applied to cores and dried (intended to improve surface of casting).
Coupon An extra piece of metal, either cast separately or attached to a casting, used to determine the mechanical or physical properties of the alloy.
Crucible A receptacle made of refractory materials used for melting and holding molten metal.
Crush Te displacement of sand at mold joints.
Cupola A cylindrical, straight shaft furnace (usually lined with refractories) for melting metal in direct contact with coke by forcing air under pressure through openings near its base.
Cure To harden. Deburring Te removal of fins or sharp edges from castings.
Dendrite A treelike microstructure pat- tern formed during the cooling of metal.
Dewaxing Te process of melting the expendable pattern out of an investment mold by the application of temperatures less than 250F (121C).
Die A metal form used as a permanent mold for diecasting or for a wax pattern in investment casting.
Dowel A pin of various types used in the parting surface of parted patterns or dies to assure correct alignment.
Draft Tapering on the vertical sides of a pattern or corebox to permit the core or sand mold to be removed without distorting or tearing the sand (Fig. 4). Drag Te bottom half of a horizontally
2014 CASTING SOURCE DIRECTORY METAL CASTING DESIGN & PURCHASING 45
Fig. 4. Shown is proper, positive draft and incorrect, negative draft. Draft refers to the taper of the pattern, which allows it to be extended from a compacted sand mold.
Ductile iron Cast iron that has the major part of its graphite carbon in nodular form.
parted mold.
Dye penetrant inspection An inspection method used to detect cracks or other surface defects in non-magnetic materials by injecting a colored liquid.
Ejector pins Movable pins in pattern dies that help remove patterns or die castings from the die.
Elasticity Te property of recovering original shape and dimensions when a deforming force is removed.
Elongation Te amount of permanent extension near the fractures in a tensile test, expressed as a percentage of origi- nal gage length.
Eutectic temperature Te lowest melting temperature in a series of mixtures of two or more components.
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