What are the most important considerations for minimizing porosity in a die cast part?
A. Vacuum-assisted production, now being widely used in die casting plants, can greatly reduce gas entrapment in a casting and thus improve its integrity. Vacuum systems, however, should be considered an important supplement, not a substitute for a product design which addresses minimizing the creation of porosity and sound die cavity, runner, gating and overflow design. Depending on the part configuration and porosity specifications, good part and die design can often provide all the casting integrity required for trouble-free machining without the use of vacuum. Where high structural integrity is required throughout the casting, high vacuum-assisted production is nearly always recommended for aluminum and magnesium die cast parts.
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