Method for making foundry moulds and cores
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United States of America Patent
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Apr 27, 1982
Grant Date -
N/A
app pub date -
Feb 19, 1980
filing date -
Feb 16, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for making foundry moulds and cores where after preparation of the moulds and cores having a sand composition of a low strength up to 0.03 MPa, a cooling medium is introduced into the mould cavity, preferably liquid nitrogen, in an amount to provide hardening of only the surface layer of a required sufficient to reproduce the shape of the mould cavity.
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