Abstract
The modeling of equivalent fixture error (EFE) in machining process has been proved to be an effective way for variation reduction. However, previously developed approaches did not describe the EFE phenomenon of workpiece deformation. This paper proposes a comprehensive EFE model that can simultaneously transform the datum errors, machine tool path error and workpiece deformation to EFE. The developed model can also describe the EFE phenomenon for general fixture layouts rather than being limited to an orthogonal 3–2-1 layout case. Based on this comprehensive error compensation strategy, the datum errors, machine tool path error and workpiece deformation can be compensated for machining process with general fixture layouts. The case studies demonstrate the model validity through the real machining experiments and also show a simple simulation process for error compensation.
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