Considering the requirement on the high-precision measurement of deep-hole diameter with limited measuring space
a precise on-line measurement device for deep-hole diameter was designed using the mechanical measurement transformation mechanism and the inductive displacement transducer. First
the mechanics analysis of the measurement transformation mechanism was performed and the main factors affecting the measuring accuracy were deduced. Then
a method of systemic error compensation for the device was proposed
and the on-line measurement platform was set up. Finally
the measurement device was installed on the automatic production line
and the measuring experiments were carried out repeatedly to measure the calibrated inner hole diameter of a workpiece. The statistical analysis of the measurement system was performed based on the theory of Six Sigma. The analysis results suggest that in order to improve the measuring accuracy and dynamic performance of the system
a larger rigid ratio and a reasonable reed height should be chosen to ensure a smaller parasitic rotation and a higher natural frequency when the transformation mechanism is designed. The experimental results suggest that the system bias is 0.02 μm
the range is 2 μm and the measuring accuracy is 3 μm. The device has the advantage of simple structure and high precision
which meets the requirements of on-line measurement of deep-hole diameter.
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references
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