The Study Of The Spindle Rigidity Based On The High Speed Turning-milling MC

The cutting speed of high speed machine is 5—10 times higher than traditional cutting speed. Turning-milling MC is the precondition for realizing the high speed machining. And the high speed motorized spindle is its heart part. The motorized spindle is equipped with a built-in motor, so that "zero transmission" is realized.To a great extent, the construction design, the static and dynamic rigidity performances of the motorized spindle determine machining qualities and cutting capabilities, and are the important factors influencing the precision of theTurning-milling MC. It is important to study the spindle's rigidity and optimization of the supporting construction of the MC.In this paper, which supporting construction influencing the spindle groupware static and dynamic rigidity is analyzied in theory. The static and dynamic rigidity is simulated and validated thoroughly using ANSYS software by FEM. Details of the studies are as follows.1 .The fluence on static rigidity of two-supporting and three-supporting construction is analysied. One simplified formula on the optimal span is summarized from the point of view of optimization2.By the modeling and analysis of force characteristics for Angular Contact Ball Bearing, the static stiffness of bearing for the motorized spindle is calculated usingsimple method, and the influence of preload on static stiffness of bearing is studied, and a set of accurate simplified formulas on the dynamic stiffness of bearing aresummarized by the analysis of dynamic characteristics for high-speed Angular Contact Ball bearing.3. A two-dimensional FEM model of the motorized 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;the rationality of the spindle design and construction will be validated.