Spindle Housing Design Parameter Optimization Considering Thermo-Elastic Behaviour

Abstract

This paper presents a simulation method for predicting thermo-elastic behaviours of spindle-bearing system and an optimization procedure for housing design parameters in relation to various spindle-bearing operating and surrounding conditions such as assembling tolerance, geometric dimension, cooling condition and thermal deformation. The numerical formulation of transient thermo-elastic behaviours as a function of major spindle-bearing system design parameters is developed using the design of experiment methodology. The spindle-bearing analysis program has also been suggested in this paper. The suggested modelling and optimization method not only considers thermal deformation or heat transfer, but eventually it includes the nature of thermo-elastic interaction within spindle, bearing, housing and surrounding conditions in terms of formulating the objective function describing thermo-elastic characteristics such as friction moment, heat generation, contact mechanism, thermal displacement, assembly tolerance change, bearing internal clearance and spindle stiffness change and the dynamically changing operating conditions of the spindle. In order to substantiate the method, this paper shows a numerical example of formulation and optimization results for spindle housing design parameters with consideration of thermo-elastic behaviours as the thermal displacement, the preload increase, and the preload fluctuation.

A comparative study on the dynamics of high speed spindles with respect to different preload mechanisms

“…Considerable research related to bearing preload issues have been carried out, which includes thermally induced bearing preload [7][8][9], bearing preload monitoring [10,11], control [6,12], and optimization [13]. However, few investigations have been performed on sensitivity of spindle dynamics to different bearing preload mechanisms.…”

Cooling of motor spindles—a review

“…One approach is compensation, which also includes the cooling techniques discussed in this paper. The application of special materials (e.g., [44,45]) and targeted heating (e.g., [46,47]) as well as design adaptions (e.g., [48,49]) are also assigned to compensatory measures. Another approach is the application of corrective measures.…”

Thermal issues in machine tools

“…Environmental influences like machine shop temperature generally lead to slow changes of machine tool temperatures, but affect the whole volumetric performance. Internal influences like heat generated by bearings and guideways, lead to a local deformation of the machine tool structure and therefore lead to displacements, which change the volumetric performance partially [4,123,124,125,133,134,135,139,168,173,182,196]. Displacements caused by internal heat sources are less predictable and can change faster than those caused by the environment.…”