The grinding accuracy of centerless grinding machines is closely related to their dynamic characteristics

and the joint has a significant impact on the dynamic characteristics. However

up to now

the existing studies on dynamic characteristics of centerless grinding machines rarely considers the joint parts. Therefore

this article first theoretically calculates the stiffness of the fixed joint

ball screw joint and sliding guide rail joint

and establishes an accurate finite element model of the centerless grinder based on the joints. Afterwards

overall machine experiments and finite element modal analysis were conducted to verify the correctness of the joint stiffness calculation method and finite element model by comparing the first six modal parameters. On this basis

influences of the stiffness of the ball screw joint

the sliding guide joint

and the different component masses on dynamic characteristics were explored in detail. The study identified weak links in the entire machine and provided optimization suggestions. Subsequently

the impact of different joint stiffness and component masses on dynamic characteristics was revealed.