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An Investigation on the Relationship among Preload, Axial Stiffness, Dimensions and Tolerancing of Ball Screw
Ball screw has been widely applied to the transmission of precision machinery and is a crucial component for precision industry. It is thus an important issue to understand and to control the performance of Ball screw. The rigidity, one of the important performances of a ball screw, depends on the preload among the nut, the screw and the ball. The rigidity is strongly related to the dimensional tolerancing of these components. This research is aimed to investigate the relationship among preload, axial stiffness, dimensions and tolerancing of the ball screw. We first investigate the relationship among the axial stiffness and interferences among these components and verify the model by finite element analysis (FEA). Both the model and FEA showed that the deformation of components saturated as the preload increases. In other words, the stiffness of the ball screw increases when the interferences among components increase. Furthermore, a series of sensitivity analyses are conducted to investigate the effects of dimensions and tolerances on the preload of ball screw. It revealed that the stiffness is strongly affected by the size of the internal diameter. It reflects that size tolerance of the internal diameter is crucial and must be strictly controlled. Further investigation via tolerance sensitivity analysis showed that the variation of stiffness is mostly sensitive with respect to the ball diameter. That reflects the most effective way to control the variation of stiffness is to adjust the tolerance of the ball.
|Appears in Collections:||機械工程學系所|
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