Casting green sand mold, and method for producing cast article using it
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United States of America Patent
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May 18, 2021
Grant Date -
Aug 17, 2017
app pub date -
Aug 19, 2015
filing date -
Aug 29, 2014
priority date (Note) -
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Abstract
A casting green sand mold comprising at least a pair of green sand mold parts each having a cavity portion, which are stacked with their cavity portions aligned to form a metal-melt-receiving cavity; each of the green sand mold parts being formed by casting sand containing a binder and water; a hardening-resin-based coating layer being formed on at least the cavity portion of each green sand mold part; the coating layer having gas-permeable pores having sufficient permeability to permit a gas generated by pouring a metal melt to escape; and a water content in a surface layer including the coating layer in a range from the cavity surface to the depth of 5 mm being smaller than that in the inner portion of the green sand mold.
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