High pressure injection results in a very fast filling of the mold so that the molten metal can fill the entire mold before any part solidifies. In this way, surface discontinuities can be avoided even in thin-walled sections that are difficult to fill.
This problem can be reduced by placing a vent on the parting line, but even a very precise process will leave a hole in the center of the casting. Most die castings can be used to perform structures that cannot be completed by casting, such as drilling and polishing.
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