Sprue (manufacturing)
channel through which liquid material enters a mold, or excess material that solidifies in such a channel and is later removed
A sprue is a large diameter vertical channel through which liquid material is introduced into a mold. It connects the pouring basin to the runner. In many cases it controls the flow of material into the mold. During casting or molding, the material in the sprue will solidify and need to be removed from the finished part. It is usually tapered downwards to minimize turbulence and formation of air bubbles.
Casting
In casting, a sprue is the passage through which a molten material is introduced into a mold, and the term also refers to the excess material which solidifies in the sprue passage.
Function
Sprues can serve as filters, as heat sinks, and as feeders. Bronze, in particular, has a high shrinkage rate as it is cooling. A sprue is tapered with its bigger end at the top to receive the liquid metal, the smaller end is connected to the runner.
Sprue design
The design of the sprue gating and runner is also essential for casting.
The public source identifies “Sprue (manufacturing)” as channel through which liquid material enters a mold, or excess material that solidifies in such a channel and is later removed. This brief keeps that definition visible, then builds a research path around Sprue, manufacturing and channel.
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This entry incorporates text from “Sprue (manufacturing)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.