Determination of the Natural Frequency of the Model Spindle System with Active Regulation of the Initial Tension of the Bearings

Paweł Turek

doi:10.3390/lubricants9070068

Abstract

This article presents a test stand with a model high-speed spindle equipped with a system of active control of the preload of the bearings. This preload was changed by means of three piezo actuators. The work presents the results of tests during which the commercial Abacus measuring equipment from Data Physics was used. Its application has shown that the spindle system with angular contact ball bearings is responsive to changes in the preload value of these bearings. The change preload resulted in a change in the value of the resonant frequency of the system and its amplitude. This article presents the dependence between the variable value of the preload of the bearings and the corresponding values of the resonance frequency and amplitude of the spindle system. The use of the Abacus measuring equipment for testing allowed for the preparation of a model showing the dynamic behavior of the spindle. The system was forced by a signal with known parameters, and the response to this excitation was recorded at eleven points located on the surface of the entire spindle.

Highlights

Modern main drive machine tools usually use electro-spindles
Due to a number of physical phenomena that occur in the spindle system, in modern machine tool spindles, various types of mechanical or mechatronic solutions are used to control and correct the value of the initial tension of the bearings during spindle operation
In [14], the authors present a system for the automatic implementation and interpretation of the modal analysis of machine tool spindles

Summary

Introduction

Modern main drive machine tools usually use electro-spindles. For their bearing, designers are very eager to use angular contact ball bearings, which have the ability to bear both radial and axial loads [1]. Determination of the Natural Frequency of the Model Spindle System with Active Regulation of the Initial Tension of the Bearings. Due to a number of physical phenomena that occur in the spindle system, in modern machine tool spindles, various types of mechanical or mechatronic solutions are used to control and correct the value of the initial tension of the bearings during spindle operation.

Results

Conclusion