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Effect of alignment errors on operation of machine tool spindle with active bearing preloading module

Turek Paweł, Stembalski Marek

Archive of Mechanical Engineering

2020

LXVII, nr 3

323--334

The article describes a test stand with a spindle equipped with an active bearing preload system using piezoelectric actuators. The proper functioning of the spindle and the active system was associated with the correct alignment of the spindle shaft and the drive motor. The article presents two methods of shaft alignment. The use of commonly known shaft alignment methods with dial indicators is insufficient from the viewpoint of being able to control this preload. This work aims at making the readers aware that, for systems with active bearing preload, the latest measuring devices should be used to align the shaft. The use of commonly known methods of equalization with dial gauges is insufficient from the point of view of controlling this preload. Increasing the accuracy of shaft alignment from 0.1 to 0.01 mm made it possible to obtain a 50% reduction in the displacement of the outer bearing ring during spindle operation.

Finite Element Modelling of a Pair of Flexible Elements Contact Preloaded and Externally Loaded with an Arbitrary Force

Grzejda Rafał

Advances in Science and Technology. Research Journal

2020

Vol. 14, no 3

118--124

In the paper, the numerical tests of the contact of a pair of flexible elements were presented. The non-linear phenomena occurring in the contact zone of two elements have been considered separately for the assembly and operational condition of the joint. The physical and mathematical models of the contact joint created using the finite element method were proposed. The contact joint is treated as a system composed of the subsystems: two of them are joined elements and the third one is the contact layer between the elements. The calculations results for the selected contact joint were given.