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Calculate the size of cylindrical riser (height and dia equal) to feed a steel slab casting 25x25x5 cm.

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in Casting-Forming-Welding I by (687k points)
Calculate the size of cylindrical riser (height and dia equal) to feed a steel slab casting 25x25x5 cm.

(a) 10cm

(b) 12.5cm

(c) 14cm

(d) Data insufficient

I got this question in an international level competition.

Enquiry is from Pattern Design topic in portion Pattern and Pattern Making of Casting-Forming-Welding I

1 Answer

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Correct answer is (b) 12.5cm

The best I can explain: a = 25cm   b = 5cm  c = 25cm

Modulus Mc =  (a×b)/2(a+b) = Mc =  (25×5)/2(25+5) = 125/60 = 2.0833cm

The riser diameter D = 6 x Mc = 6×2.0833 = 12.5cm.

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