| With the development of wire bonding technology, the invention and innovation of high-precision, high-efficiency and high-reliability wire bonder is an imperative requirement for packaging manufacturing. From the point of view of mechanical structure, this thesis focuses on an important factor----the dynamic characteristics of the joint surface.Mechanical joints are natural structure of all mechanical systems. When loaded with force, it behaves complex dynamical characteristic with damping and elasticity and affects so much dynamical characteristic of mechanical systems, so joints affect dynamical characteristic of machine tools very much.Upon the analysis of the current research development at home and abroad, this thesis has studied the dynamic characteristics of a typical joint surface. This research has fully considered the relative movement state of the sub-structure, established a finite element model of the joint surface. Compared with the recent research achievements of the joint surface, the coupling relationship between the various degrees of freedom is considered in this modal, which can reflect the dynamics of joint surface more accurately. According to the dynamic model, a new parameter identification method is proposed to testing the key frequency of the joint surface with the finite element analysis and experimental modal analysis method. The result is a strong proof of the validity of dynamic model of the fixed joint surface and the accuracy of model parameter identification methods, which is a preparation for the further structural optimization. |
