Sprue (casting)

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Bronze casting showing sprue and risers
Bronze casting showing sprue and risers

In foundry work, a Sprue is the passage through which metal is poured into a mold. The term can also refer to the excess metal on a rough casting, which solidified in the sprue hole. The term has the identical usage in the plastic injection-molding industry.

Sprues can serve as filters, heat sinks and as feeders. Bronze in particular has a high shrinkage rate as it is cooling, a sprue can continue to provide molten metal to the casting, provided it is large enough to retain its heat and stay liquid, as metal in the main casting cools and shrinks. The design of the sprue and runner system can be also utilized to trap unwanted dross and sand from continuing into the main cavity, this may include adding porous material to the runners, or designing the sprue to eject the dross to the side of the sprue (cyclone effect).


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Metalworking
Casting technologies Sand • Lost Foam • Investment (Lost Wax) • Die • Spin • Shaw process • Centrifugal • Tilt • Vacuum • Continuous • Billet
Furnace Technologies Cupola • Reverberatory • Puddling • Bessemer • Open Hearth • Electric Arc • Electric Induction • Rotary
Casting Terminology Flask • Sprue • Riser • Cope and drag • Draft angle • Dross • Green sand • Molding sand • Chill • Ingot • Pattern • Slag
Metalworking topics Casting • CNC • Cutting tools • Drilling and threading • Fabrication • Forging • Grinding • Jewellery • Lathe • Machining • Machine tooling • Measuring • Metalworking • Hand tools • Metallurgy • Milling • Occupations • Press tools • Pipe and Tube bending • Smithing • Terminology • Welding
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