A steel plate casting, 1 in. X 4 in. X 12 in., is to be poured in 5 sec. The runner is 4 in. below the top of the cope, and the gating ratio is 1 : 3 : 3 with one down sprue, two runners, and four...

A steel plate casting, 1 in. X 4 in. X 12 in., is to be poured in 5 sec. The runner is 4 in. below the top of the cope, and the gating ratio is 1 : 3 : 3 with one down sprue, two runners, and four ingates (gates). Assume the sprue is a tapered cylinder, the runners are square, and the gates are rectangular with the width twice the height. The density of steel is 7.8 g/ cm3, the dynamic viscosity is 6 centipoise, and the estimated yield is 50 percent. The solidification shrinkage is 5 percent, and the riser feed metal fraction is 16 percent. Use a top riser for feeding.

a. Make a sketch of the casting and gating system, and calculate the dimensions of the sprue base, runner, and ingates.

b. Recommend the size of the riser, and check the thermal adequacy, the volume of feed metal, and the feeding distance requirements.

c. What is the maximum Reynolds number?

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