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shrinkage, casting |
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shrinkage, casting, n a volume change (contraction) that occurs when molten metal solidifies after being cast into a pattern mold. It is compensated for in three ways: by using the indicated water:powder ratio for the refractory investment to gain the maximal setting expansion of which that investment is capable; by exposing the investment to moisture as the refractory investment sets, causing some hydroscopic expansion; and by properly heating the mold to achieve thermal expansion. The total expansion must equal the contraction of the metal being cast. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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