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A sphere can be used as a riser because of its freezing ratio, which is greater than unity.

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in Casting-Forming-Welding I by (687k points)
A sphere can be used as a riser because of its freezing ratio, which is greater than unity.

(a) True

(b) False

I got this question by my college professor while I was bunking the class.

Enquiry is from Riser Design topic in division Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

1 Answer

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Best answer
Correct choice is (b) False

Best explanation: Freezing ratio greater than unity is always preferred for the ability to feed the casting. Sphere could be used as a riser as its surface area to volume ratio is very low. But in sphere, the hottest metal being at centre, it is very difficult to use it for feeding to the casting, so a cylindrical type is always preferred.

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