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Abstract: An auto-alignment laser interferometer system is developed
for volumetric error measurement of CNC machining centers. The system is
capable of the displacement measurement with the change of laser beam
directions, whore multiple machine axes arc moved simultaneously, with
automatic optic alignment, This capability provides a solution for quick
evaluation of the overall volumetric error of a multi-axis machine tool.
A novel approach, which is capable of direct measurement of the total
position errors at the tip of the tool of a multi-axis machine tool
without the use of an error model, is presented by only one the manual
alignment of the optic set and laser path, The error vector components
at different location in the machine work space are stored in a 3D
lattice, The meshing concepts developed in the finite element method
literature are used to predict the volumetric errors at any point in (he
workspace. The strategies developed are testes on a CNC machine, and the
results verify the effectiveness of the method.
Key words: CNC
machining centers Auto-alignment Laser interferometer
Error compensation
CLC No: TH161 TG659
国家863计划(863-511-820-004)和国家博士后科学基金资助项目(19990510). Received 20010712,
received in revised form 20020130 |