In order to further clarify the influence of centrifugal force on the dynamic characteristics of high-speed spindle system,a contact model of toolholder is established by taking the rotor-draw bar system as the research target,and considering the radial extension of disc spring under centrifugal force.The relationship between the tension caused by deformation of disc spring and the rotation speed is investigated.On this basis,the changing rule of the contact stress of toolholder with the initial tension for...