Assessing the spindle dynamic quality

Spindle assembly appears to be one of the main elements in modern metalworking equipment. It is a shaft mounted on the bearing supports, which allows its consideration in the form of a discrete model with the concentrated masses, taking into account the shaft compliance. The paper describes a method for assessing the spindle dynamic quality. It presents results of analytical computation, numerical simulation and experimental confirmation using a stand and the vibration diagnostic device. The shaft is mounted on two radial rolling bearings and divided into eight solid cylindrical sections and one section with a keyway. Qualitative and quantitative characteristics are obtained, the shaft dynamic quality is assessed, and the computation error in the applied computation methods is provided. Checking the proposed method adequacy for assessing the dynamic quality showed satisfactory convergence (15...18%), which allows its use both for a finished product and in design.
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