Abstract: In the new grinding method of tangential point tracing grinding, the machining error caused by the elasticity displacement of crankshaft because of it’s poor rigidity is one of the most important causes affecting grinding precision and machining efficiency. To compensate this error, the crankshaft’s stiffness error is analyzed when using the method of tangential point tracing grinding in the machining of the connecting rod of crankshaft. On the base of the analysis above, a mathematical model of stiffness-error compensation of crankshaft is established. At the same time, the general method of calculating the elasticity displacement of crankshaft in the process of grinding is proposed as well.

Key words: Crankshaft, Error compensation, Stiffness, Tangential point tracing grinding