EMAE 160 Final Review CWRU - Metal
Forming Exam Questions and Answers
What is the purpose of burnishing? - ANSWER-Burnishing smoothes the surface and
makes it shinier.
What are the differences between fine blanking and standard sheet metal blanking? -
ANSWER-Fine blanking produces clean right angles and doesn't require any
remachining.
How are most externally threaded fasteners manufactured? - ANSWER-Cold
heading
What is bend allowance? What sort of materials does it apply to? - ANSWER-Bend
allowance is the length a part gains when it is unbent. This is equal to the arc length
of the bend. This applies to all bent parts.
Name the three basic types of forging operations. - ANSWER-Open die, closed die,
impression die
Does the flash produced in impression die forging serve a useful purpose? Is it
desirable? Why? - ANSWER-Yes. This flash cools quicker than the part in the cavity
and thus keeps the rest of the metal fixed where it needs to be.
Define spring-back in sheet metal bending. - ANSWER-When a bent piece of sheet
metal bends back a bit after releasing the force that bent it in the first place.
Name the three types of forging processes. - ANSWER-Hydraulic, mechanical,
impact.
Explain the difference between a mechanical press and a hydraulic press for forging.
- ANSWER-Hydraulic- Slow with a constant force.
Mechanical- Quick bursts of force.
Explain the differences between cold-rolled and hot-rolled steels. - ANSWER-Cold-
rolled has a better surface, tolerance, and mechanical properties.
Hot-rolled takes place above the recrystallization temperature.
Is forging always done in a vertical direction? - ANSWER-No (absolutely not you
imbecile).
How is a soda can made? - ANSWER-Deep drawing
What are the differences between deep drawing and impact extrusion? - ANSWER-
Impact extrusion starts with a blank sitting in the die. Deep drawing starts with a
blank sitting on top of the die being held down by a blank holder.
Forming Exam Questions and Answers
What is the purpose of burnishing? - ANSWER-Burnishing smoothes the surface and
makes it shinier.
What are the differences between fine blanking and standard sheet metal blanking? -
ANSWER-Fine blanking produces clean right angles and doesn't require any
remachining.
How are most externally threaded fasteners manufactured? - ANSWER-Cold
heading
What is bend allowance? What sort of materials does it apply to? - ANSWER-Bend
allowance is the length a part gains when it is unbent. This is equal to the arc length
of the bend. This applies to all bent parts.
Name the three basic types of forging operations. - ANSWER-Open die, closed die,
impression die
Does the flash produced in impression die forging serve a useful purpose? Is it
desirable? Why? - ANSWER-Yes. This flash cools quicker than the part in the cavity
and thus keeps the rest of the metal fixed where it needs to be.
Define spring-back in sheet metal bending. - ANSWER-When a bent piece of sheet
metal bends back a bit after releasing the force that bent it in the first place.
Name the three types of forging processes. - ANSWER-Hydraulic, mechanical,
impact.
Explain the difference between a mechanical press and a hydraulic press for forging.
- ANSWER-Hydraulic- Slow with a constant force.
Mechanical- Quick bursts of force.
Explain the differences between cold-rolled and hot-rolled steels. - ANSWER-Cold-
rolled has a better surface, tolerance, and mechanical properties.
Hot-rolled takes place above the recrystallization temperature.
Is forging always done in a vertical direction? - ANSWER-No (absolutely not you
imbecile).
How is a soda can made? - ANSWER-Deep drawing
What are the differences between deep drawing and impact extrusion? - ANSWER-
Impact extrusion starts with a blank sitting in the die. Deep drawing starts with a
blank sitting on top of the die being held down by a blank holder.
