FEM For Static And Dynamic Performance Of High-percision Machining Spindle

With the development of global automotive industry, the Modular Machine Tool (MMT) has been developed, and more and more automotive parts need the MMT or Automatic Production Lines based on MMTs to machining. As the very important geveral parts of design and manufacture MMTs——Machining Spindles, the high-strength, high-precision and high- reliability are the necessary conditions for improving the production rate, reducing the production cost and ensuring the quality of products. Therefore, it is important to study the spindle contruction design and optimization of the static and dynamic performance on improving the performance of the MMTs.In this paper, the design and contruction, the static and dynamic performances of the Machining Spindles are studied throughly using ANSYS software by FEM. Details of studies are as follows,1st. The construction of the Machining Spindle and the influences on the static and dynamic performances of spindle are studied, and the contruction of the Machining Spindle is designed based on satisfying the static and dynamic performance.2nd. By the modeling and analysis of force characteristics for Angular Contact Ball Bearing, the static stiffness of bearing for the spindle is calculated using simple method, ang the influence of preload on static stiffness of bearing is studied, and a set of accurate simplified formula on the dynamic stiffness of bearing are summarized by the analysis of dynamic performance for high-precision Angular Contact Ball Bearing.3rd. A two-dimensional FEM model of the machining spindle is built up with ANSYS, the static stiffness of spindle is studied and the influence of preload on it is also analyzed in detail.4th. A more accurate three-dimensional FEM model of the machining spindle is established. Based on the model, the modal and response characteristics pf the machining spindle are analyzed. The natural frequency, vibration mode and limit speed are stidied. The influence of preload on first set of natural frequency of spindle is analyzed. The maximum dynamic displacements of the front end, rotor and rear end on spindle are studied, therefore, the rationality of the spindle design and construction will be validated.