Overflow (die cast)

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In die casting, the overflow , also known as air bean, has the task of diverting liquid metal, which contains air, separating agent vapors or oxides caused by turbulence , from the mold cavity .

The overflows are milled cutouts in the mold insert near the mold cavity, which are connected to the mold cavity by a thin gate. These are provided with ventilation ducts that are intended to allow air and separating agent vapors to be extracted to the outside.

Overflows should be placed in such a way that oxides and residues of the lubricant are washed out, and they should also ensure that certain areas of the mold are heated.