Differentiate between Open die forging and Closed die forging.

Difference between Open die forging and Closed die forging:

Sr. No.	Open Die Forging	Closed Die Forging
1.	Tooling is simple.	Complex operation.
2.	Produces Work pieces with less dimensional accuracy.	Higher Dimensional accuracy.
3.	Skilled operator Required. Final shape of forging depends on skills of operator.	Required Semi-skilled operator.
4.	Process has less Reproducibility.	Process has more Reproducibility. Suitable for making negatives or duplicates of each other.
5.	More material waste.	Relatively Reduced material waste.
6.	Low costly process.	Expensive process.
7.	Difficult to maintain close tolerances.	Easy to maintain close tolerances.
8.	Applications: Crankshafts, Shells and containers, Reactor vessels.	Applications: Manufacturing of connecting rod, rocker arms, gears, shafts, Defence and aircraft industry.
9.	Also called as Smith die forging.	Also called as Impression die forging.
10.	Types: Hand forging, Hammer forging, press  forging.	Types: Drop forging. Machine forging.