2006-09-01 16:05:56 · 3 answers · asked by Venkatesan N 1 in Cars & Transportation ➔ Maintenance & Repairs
In their initial form, crankshafts can be forged or cast. After that process, they are normally machined (in a programmed production process) into their final form and specifications. The initial forming (forging or casting) is usually by one maker, who then sends it to another operation for the machining process.
2006-09-01 16:10:01 · answer #1 · answered by Kentucky_Hillbilly 2 · 0⤊ 0⤋
For the typical cast crankshaft, the factory starts by making a mold. This is typically made from sand with a bit of clay mixed in, and has a hollow crankshaft-shaped pocket. They then pour molten iron into this hollow pocket, allow it to cool, and then break up the sand and fish the crankshaft out. Then they trim off the area where the iron flowed into the mold and drill oil holes in it. Then they put it on a crankshaft grinder. This machine is a sort of special lathe that polishes all the places that they will put bearings.
With a forged crankshaft, they start with two enormous dies. The workers put a piece of solid steel (which may or may not be heated) between the dies, and a hydraulic hammer squeezes the steel into the shape of a crankshaft. I think in some cases they may need to twist the crank to get the rod journals (the spots where the connecting rods attach) to line up correctly, but I'm not 100% sure on that one. The drilling and grinding steps remain the same.
2006-09-02 09:15:09 · answer #2 · answered by Mad Scientist Matt 5 · 0⤊ 0⤋
cast of forged cast is when the metal is poured into a mold alowed to cool then removed from the cast . frorged is pressed hand shaped and hardened much stronger . you can tell the diff in 2 ways foroged you will see thin lins in the crank when held up by a wire and tapped it will make a very sharp ring tone .cast is just the oppsit
2006-09-01 16:12:52 · answer #3 · answered by k dog 4 · 0⤊ 0⤋