Abstract: The relations between a CNC spiral bevel gear grinder spindle and it’s structure parameters are investigated. The FEM model of the spindle system, the modal analysis and the harmony response analysis of the spindle system are developed. The lower–order mode’s shape, natural frequency, the response curve of the amplitude frequency and the Nyquist curve are obtained in a certain conditions. The effect of the supporting span and the bearing stiffness on the spindle system intrinsic property and the vibration resistance are analyzed. By APDL modeling method an analysis model parameterized the key structure dimension of the spindle system is formed. Analysis results show that the first natural frequency is increased in large scale as the bearing stiffness increases, and that the supporting span has relatively less influence on the first natural frequency, and in order to improve the manufacturing accuracy of the CNC spiral bevel gear grinder it is exercisable to increase the bearing stiffness to 3 450 N/mm and increase the span to 300 mm.

Key words: Dynamic properties, Finite element analysis (FEA), Harmony response, Mode shape, Natural frequency, Spindle system, Adaptive weighted network, Error source diagnosis, Key process, Variation propagation, Multiple variance flow