| 摘要 |
This invention regards a bench, a shell and a casting procedure, particularly for engine cylinder heads, characterised by low-pressure casting, or the introduction of molten metal from a furnace into a shell positioned above it, exercising pressure on the surface of the molten metal inside the same furnace, combined with the free-fall feeding of the same shell. Free-fall casting takes place with open risers created in the shell, the latter being sealed at the top, at least in line with these risers, by lids moved by a tilting arm joined to the casting bench.
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