Accuracy Enhancement of a Hexapod Machine Tool
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Beschreibung
The object of this research is to analyze the error sources of the
hexapod machine and develop strategies to enhance its accuracy. The
most significant error sources are identified as the geometric errors,
thermal errors and errors due to finite stiffness. Subsequently,
considering major inaccuracy factors related to the manufacture,
geometry, and kinematics of such machines, a mathematical error is
presented based on volumetric error analysis. In order to understand
the character and propagation of errors on the Hexapod machine tool,
sensivity analysis is used to investigate the contribution of the error
sources on accuracy and an error analysis system that graphically
presents the total error distribution is developed. The developed error
compensation system is based on the measurement and modeling of the
behavior of the machine tool. It is composed of an interpolation
algorithm based on shape functions for error prediction and a recursive
software compensation procedure. In addition, an automatic NC code
converting software was developed so that the developed system could be
applied to practical machine with Hexapod machines.
Autor*in
Li Zhang
Themen in »Accuracy Enhancement of a Hexapod Machine Tool«
Fertigungstechnik Maschinenbau Messtechnik