A circular disc is to be cast in steel (Fig XXXXXXXXXXThe steel has a solidification shrinkage of 6 percent, feed metal capacity of 15 percent, density of 0.28 lbh.?, and an estimated yield of 60...

A circular disc is to be cast in steel (Fig. 9.8). The steel has a solidification shrinkage of 6 percent, feed metal capacity of 15 percent, density of 0.28 lbh.?, and an estimated yield of 60 percent. The gating ratio is 1 : 3 : 5, and a single tapered sprue is used with two square runners and four

gates with a height: width ratio of 1 : 3. The circular disc is 8 in. in diameter and 2 in. thick. The effective sprue height is 6 in., and the desired pouring time is 15 sec. A top cylindrical riser is to be used and is located at the center of the disc

a. What is the modulus of the casting, in inches?

b. Estimate the diameter of the riser based upon solidification time

c. Estimate the diameter of the riser based upon feed metal red.

d. Determine the pouring rate (in.’/sec) for the casting.

e. Determine the diameter of the sprue base.