Apparatus for compacting foundry mold making materials
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United States of America Patent
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-
Sep 2, 1986
Issued Date -
N/A
app pub date -
May 21, 1985
filing date -
Dec 28, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a process for compacting foundry mold making material, that is loosely heaped in a closed mold space over a pattern, the surface of the material is acted on by a compressed gas with a pressure of at the most 8 bar. This gas is caused to undergo expansion out of an inlet space through a valve in an opening at a gas flow rate of over 50 kg/sec and with a pressure increase rate of over 300 bar/sec, into the mold space. The maximum pressure in the inlet space or antichamber is 20 bar. An apparatus for use in the method is made up of a pressure vessel, a mold flask placed thereunder having a filling frame and a pattern plate. The opening cross section of the valve is 50 to 150% of the horizontal cross section of the mold flask and is opened in a short time of the order of milliseconds.
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