Abstract
As the core component of machine tool, the thermal characteristics of the spindle have a significant influence on machine tool running status. Lack of an accurate model of the spindle system, particularly the model of load–deformation coefficient between the bearing rolling elements and rings, severely limits the thermal error analytic precision of the spindle. In this article, bearing internal loads, especially the function relationships between the principal curvature difference F( ρ) and auxiliary parameter nδ, semi-major axis a, and semi-minor axis b, have been determined; furthermore, high-precision heat generation combining the heat sinks in the spindle system is calculated; finally, an accurate thermal model of the spindle was established. Moreover, a conventional spindle with embedded fiber Bragg grating temperature sensors has been developed. By comparing the experiment results with simulation, it indicates that the model has good accuracy, which verifies the reliability of the modeling process.
Highlights
A study on the thermal model and improvement of the computer numeric control (CNC) machine tool spindle accuracy is the most important pursuit for researchers in precision manufacturing field
The spindles can be divided into two groups: conventional spindle and motorized spindle; the latter is developed from the former, but the core units—bearings—have not been changed
A study on the traditional spindle can push for a resolution for the problems on the machine tool spindle
Summary
A study on the thermal model and improvement of the computer numeric control (CNC) machine tool spindle accuracy is the most important pursuit for researchers in precision manufacturing field. Keywords Machine tool, spindle, thermal model, bearing, heat generation
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