·Strength requirements: Strength refers to the ability of parts to not break or produce plastic deformation exceeding the allowable limit during operation, which is the most basic requirement for the normal operation of the machine and safe production.
Stiffness requirements: Stiffness refers to the ability of a part to not produce more than a specified elastic deformation during operation. This requirement is only for those parts that will reduce the performance of the machine due to excessive elastic deformation.
Life requirements: The life requirements are to require the parts to maintain normal operation during the expected working period without being scrapped.