Measuring And Modelling Thermal Distortion On CNC Machine Tools
Author(s)
A.J. White, S.R. Postlethwaite & D.G. Ford
Abstract
Measuring and modelling thermal distortion on
CNC machine tools
A.J. White, S.R. Postlethwaite & D.G. Ford
University of Huddersfield, UK
Abstract
Heat sources internal and external to a machine tool cause temperature gradients
to arise due to resistance to heat flow in and around the machine tool and
workpiece. This causes linear expansion and distortion of the structural elements
from which the machine tool is constructed. The connectivity of the structural
elements sets the effect of the expansion and distortion on the relative positions
of the tool and workpiece, leading to thermal errors on the workpiece.
Measurement on a wide range of machine tools confirms that temperature
gradients are significant in their effect on machining accuracy and that they
move and change shape during the machining process.
An analysis of machine tool structures and connectivity shows that both the
position and magnitude of temperature gradients is important in its effect upon
the relative moveme
Keywords
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