Abstract: With the increase of the cutting speed, the static and dynamic performance of the spindle/toolholder interface is required higher and higher. The traditional method, which not only has longer design cycles, but also doesn’t gain the optimum results usually, can’t meet the requirement of researching and developing products. The parametric finite element method (FEM) was used to establish and analyze the mechanical model of the spindle/toolholder interfaces, and the nonlinear quadratic programming method applied for the optimum design of the structures. It can not only improve design quality, but also shorten design cycles. The result of this study shows that a global optimum solution can be guaranteed with multiple restrains, optimal structural parameters are reasonable, and can meet the needs of the engineering application.

Key words: High rotational speed, Optimum design, Parametric FEM, Spindle/toolholder interfaces