|
|
What's in an Engine &
Why? The crank shaft transmits
axial force from combustion to rotational energy needed for motion. Crank
shafts are usually machined from forged steels with a high carbon content. In
some cases a form of gray cast iron is
used, known as nodular or spheroidal graphite (ductile
iron). Instead of flakes of graphite forming; little nodules or
spherelike particles are formed. Crank shafts are supported on both ends and some times in the middle. This requires the material to be very strong. The tensile strength of ductile iron is relatively large. Since the shaft rides on bearings friction wear considerations must be met; so the crank shaft surfaces are required to be hardened. The least costly method is carburizing, and the best and most costly method would be a nitrogen hardened method. |
|
|
|
|
|
|
|
|
|
|
Last Updated: |
Contact the professor at: stoebe@u.washington.edu
|