Question

A cylinder of diameter 150 mm and length 300 mm is to be cast without any riser. The cylinder is moulded entirely in the drag of a green sand flask and is bottom gated. The cope of flask is 200 mm height and the height of the metal during pouring is 50 mm above the cope. A tapered sprue is employed and the gating ratio is 1:2:2. The ratio of pouring times of casting for cylinder to be casted vertically to that for the cylinder to be casted horizontally is

• A. 1.6324
• B. 1.096
• C. 0.912
• D. 1.483

Answer 1

The correct option is A 1.6324


In case-I, mould height is greater than the height of molten metal, so no metal will go above $h_t$.

$\therefore (h_m{)}_{effective}=h_t\frac{T_1}{T_2}=\frac{V_{avg2}}{V_{avg1}}{v}_{avg1}=\frac{\sqrt{2g{h}_t}+0}{2}{v}_{avg2}=\frac{\sqrt{2g{h}_t}+\sqrt{2g(h_t-h_m)}}{2}\frac{T_1}{T_2}=\frac{\sqrt{h_t}+\sqrt{h_t-h_m}}{h_t}=\frac{\sqrt{250}+\sqrt{250-150}}{\sqrt{250}}\frac{T_1}{T_2}=1.6324$