Abstract
The paper considers bending vibrations of machine-tool spindles, taking into account the compliance of the spindle body and bearings. The features of the development of dynamic models concerning the spindle shape as a shaft with portions slightly different in diameter, a significant difference in stiffness values of the front and rear bearings, and their radial stiffness anisotropy. For a stiffness hodograph in the form of an oval, analytical expressions for the natural frequencies of flexural vibrations are obtained. It is shown that the presence of the spindle bearing stiffness anisotropy results in a range of the spindle bending frequencies, which makes it difficult to conduct diagnostic activities. Taking as an example the design of a model 16B16T1 lathe spindle assembly, the factors affecting the formation of the given stiffness coefficients of the dynamical system are examined. The results of evaluating the influence of the spindle bearing elastic characteristics formed during the designing and assembly on changing the magnitude and range of the stiffness coefficients given.
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