Method and an apparatus for producing shaped bodies from particulate material
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United States of America Patent
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Dec 20, 1988
Grant Date -
N/A
app pub date -
May 18, 1987
filing date -
May 18, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method of operating an apparatus with a mold chamber (8) being supplied with fluidized mold sand (2) from a supply chamber (1) under air pressure applied through suitable air channels (3), and in which the pressure in the supply chamber (1) is increased gradually from a low to a high value to avoid turbulences in the initial filling stage and ensuing weak spots in the molded article, while at the same time achieving a short total filling time and a high degree of compaction during the final stage, the new feature is that vacuum is applied through air-permeable mold chamber walls (9,10), preferably before increasing the pressure in the supply chamber (1), thus avoiding the formation of air pockets in depressions in the mold chamber walls, that could otherwise cause reduced compactness and density in protruding parts of the shaped body (not shown) being formed in the mold chamber (8).
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