Adv and disadvantage of shell moulding?

Answer 1

Advantages

a. Better surface finish

b. Better dimensional tolerances.

c. Reduced Machining.

d. Less foundry space required.

e. Low labor costs.

f. Castings require little or no machining.

g. Can be completely automated for mass production.

h. High productivity.

i. Complex shapes can be made as there is no need to withdraw the pattern

j. Very fine details and thin sections can be obtained.

k. Since there is no parting line the dimensions across will not vary.

l. Sand: metal ratios are relatively low.

m.Has better flexibility in design than die-casting.

n. Moulds are lightweight and may be stored for extended periods of time.

Disadvantages

a. The raw materials are relatively expensive.

b. The process generates noxious fumes which creates health problems must be removed.

c. The size and weight range of castings is limited.

d. Poor material strength.

e. High porosity possible.

Answer 2

Advantages of shell molding include high dimensional accuracy, smooth surface finish, and the ability to produce complex shapes with thin walls. Disadvantages can include high initial setup costs, limitations on mold size, and longer cycle times compared to other casting methods.