Forging

Question 1

What is forging?

Answer 1

Working of metal by hammering and pressing a metal into desired shape at hot temperatures

Question 2

What are the 3 ways that forging improves mechanical properties of steel?

Answer 2

1) Closes cavities
2) Refines crystal structures
3) Destroys discontinuity

Question 3

What makes forging stronger than casting?

Answer 3

The flow lines of the materials are maintained which increases strength

Question 4

What is a material requirement for forging?

Answer 4

The material has to be malleable

Question 5

What are the 2 categories of forging?

Answer 5

1) Open-die forging: working surface is flat

2) Closed-die forging: impression dies that come together are used

Question 6

How is material forged in a rolling operation?

Answer 6

Rolling passes hot metals between 2 rolls that reduce metal size due to pressure above the recrystallization temperature of the material

Question 7

How is material forged in an extrusion operation?

Answer 7

Extrusion places a hot metal into a chamber and hydraulically presses the sample through a pre-shaped opening above the recrystallization temperature

Question 8

How is material forged in a drawing operation?

Answer 8

In a drawing process the metal is pulled through a die instead of pushed

Question 9

What are some common forging defects?

Answer 9

1) Burst
2) Thermal cracking
3) Hot tears
4) Laps