What does the term "flash" refer to in die casting?

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The term "flash" in die casting specifically refers to the thin, excess portion of metal that forms along the mold parting line during the casting process. When molten metal is injected into the die, it can escape slightly at the edges due to the high pressure used and the small gap between the two halves of the mold. This results in a thin layer of metal on the exterior of the casting that is typically not intended as part of the final product.

While this flash can be considered undesirable, as it requires additional trimming or finishing, it is a normal outcome of the die-casting process. The presence of flash indicates a need for careful control of the mold design and injection processes to minimize its occurrence and ensure high-quality castings. Understanding this concept is essential for those involved in manufacturing and quality control within die casting environments.

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