Homework Number Two

Due Wednesday October 21, 2015

1) Describe the green sand casting process. Include in your description a drawing showing all parts of a green sand mold. Explain the role of each part based on casting in general.

2) Compare the following casting processes: die, green sand, and investment (lost wax).

3) Which casting process (of the ones discussed in class) would you use to produce the part shown below? Assume you have a one year contract to produce 3500 parts per month and that a small amount of finish work to be done by the customer is acceptable.

4) Both copper (Cu) and silver (Ag) are often cast. Which type of foundry would be more expensive to operate based solely on energy costs? By how much?

	Copper (Cu)	Silver (Ag)
Melting Point	1084^oC	962^oC
Heat of Fusion	2.85x10^10 J/m^3	1.97x10^10 J/m^3
Solid Heat Capacity	3.43x10^6 J/(m^3K)	3.43x10^6 J/(m^3K)
Liquid Heat Capacity	5.48x10^6 J/(m^3K)	2.88x10^6 J/(m^3K)