| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 104 === This research dedicated in developing a new measuring method for five-axis CNC machining center. By combining a DBB(Double Ball-bar) with a newly designed orthogonal plate, the measuring function of DBB will be expanded to measuring three-axis simultaneous operations. Current method is to setup at least three DBB measureing arrangements with different TCPs(Tool Centering Paths) which may cause setup errors and other errors from different TCPs. This research proposed a method by combining a DBB(Double Ball-bar) with an orthogonal plate which only needs one setup with the same TCP can measure the correct dynamic conturing errors and other simultaneous operation errors in three-axis directions.
A type-B five-axis machine tools was conduct measuring three-axis(XYC,YZA) simultaneous operations. Our experiments can determine several errors of five-axis machine tools which includes: location errors of A-axis and C-axis , servo mismach errors of XYC and YZA simultaneous operation, XY-axis backlesh and thermal influence to ecentricity. Results showed that conturing errors of XYC and YZA can be decreased from 37 μm and13.7 μm to 9 μm and 10 μm. Mismatch errors of XYC and YZA operations can be decreased from 15.5 μm and 13.5 μm to under 0.5 μm and 1 μm. Eccentricity can be decreased from 50 μm to 1 μm. By combining DBB with an orthogonal plate and software, we can complete fast measuring procedure and analysis within six minutes and overall cost is cheaper than current comercial instruments.
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