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Author Topic: What is the difference between Forging and Casting?  (Read 18506 times)

Offline AllenG

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Just as the title says, when working with metal what is the difference between forging and casting?

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Offline Mr. Scientist

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What is the difference between Forging and Casting?
« Reply #1 on: 12/12/2009 20:48:57 »
Casting. It's a word with many definitions which may and can relate to a forging.


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Offline Karsten

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What is the difference between Forging and Casting?
« Reply #2 on: 12/12/2009 21:02:49 »
Casting: Heat up metal until it turns into a liquid soup and pour it into a mold. Let it cool off, remove it from the mold (or break the mold), and you got your casting.

Forging: Heat up metal until you you can shape it with force, force it into shape by hammering or pressing it into something, let it cool, and you got your forged piece.

That should be roughly it.
 

Ethos

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What is the difference between Forging and Casting?
« Reply #3 on: 12/12/2009 21:04:34 »
Just as the title says, when working with metal what is the difference between forging and casting?

Thanks,

--A
In the automitive industry, a casting is usually referred to as any article which is poured into a mold. An example would be an aluminum casting such as an intake manifold or even a crankshaft. A forging is produced by taking a solid ingot of material, such as 4340 steel and pounding it into shape with great pressure. The resulting product is much stronger than a casting and in the case of a crankshaft, is desired in the performance application. Forged crankshafts, rods, and pistons are the only components which can stand the abuse that a high horsepower motor can generate.
 

Offline Bored chemist

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What is the difference between Forging and Casting?
« Reply #4 on: 13/12/2009 14:17:01 »
Cast iron is definitely not malleable; it's brittle. That's why there's a special product called "ductile cast iron" but tht's a relatively modern invention. On the other hand, steel is malleable- ask a blacksmith. It's easier to hammer to shape when it's hot but it can be done cold.
The twisted bits of iron used for railings and such are "wrought iron" which is actually pretty much steel. It doesn't help that there's more iron in steel than in cast iron. The nomenclature was dreamed up over the years before they really knew what they were doing.

Also, just about all the springs I have ever seen are steel, twisted into shape.
Anyway, the question has been answerd cast metals are poured into shape; forged ones are pounded to shape.
 

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What is the difference between Forging and Casting?
« Reply #4 on: 13/12/2009 14:17:01 »

 

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