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In shell molding, the pattern and sand are inverted after _________

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in Engineering Material & Metallurgy by (773k points)
In shell molding, the pattern and sand are inverted after _________

(a) 20-30 seconds

(b) 1-2 minutes

(c) 45-50 minutes

(d) 3-4 hours

I got this question in unit test.

My question comes from Casting Processes in division Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

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The correct option is (a) 20-30 seconds

Best explanation: The pattern made in shell mold casting is heated to about 230-600^oC. Then the sand-resin mixture is blown over its surface. The heated pattern melts and gardens the resins. After a specified time of 20-30 seconds, the pattern and sand are inverted, which gives a normal shell thickness of 6 mm.

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