Crankshaft is the one of the important components of internal-combustionengine. Along with the improvement of the power performance ofinternal-combustion engine, working load of crankshaft becomes stronger andstronger. In order to improve the reliability of it, crankshaft manufacturers carryout unremitting efforts in the aspects, such as material and production technologyto produce high-strength crankshaft. On the other hand, automobile factories andmaintenance manufacturers try their best to make measureme...