Abstract
As a key part of the articulated arm coordinate measuring machine, the probe can determine the measurement accuracy. Therefore, the error source and influencing factors of the equivalent diameter of the probe are studied. First, the influence of the primary factor of the measuring force on the equivalent diameter of the probe is studied by analyzing the influence degree of its error source. Second, a mathematical model of the relationship between the equivalent diameter and the measuring force of the articulated arm coordinate measuring machine is built to compensate for the equivalent diameter error caused by the measuring force by the simulated annealing method. To illustrate the application advantage of our proposed study, a simple force-measuring device is designed based on this model. The experimental result shows that the maximum error reduction is approximately 43 µm, while the average error reduction ranges from 33 to 4.0 µm, which represents an 87.7% improvement. Overall, our proposed method can effectively compensate for the equivalent diameter error caused by the measuring force. This method can improve the accuracy of the articulated arm coordinate measuring machines on both calibration and measurement.
Highlights
The articulated arm coordinate measuring machine (AACMM) is a coordinate measuring system based on a rotating joint and a rotating arm, which replaces the length measurement reference with an angle measurement reference
Compared with the traditional coordinate measuring machine (CMM), the AACMM has the advantages of a simple mechanical structure, small volume, high efficiency, lightweight, large measuring range, flexibility, convenience, low cost, and field measurement capability
Based on the above analysis, this article focuses on the effects that the thermal deformation, eccentricity, and measuring force have the equivalent diameter of the AACMM
Summary
The articulated arm coordinate measuring machine (AACMM) is a coordinate measuring system based on a rotating joint and a rotating arm, which replaces the length measurement reference with an angle measurement reference. Compared with the traditional coordinate measuring machine (CMM), the AACMM has the advantages of a simple mechanical structure, small volume, high efficiency, lightweight, large measuring range, flexibility, convenience, low cost, and field measurement capability. It is widely used in automobiles, ships, mechanical processing, and other areas. Understanding how the probe tip wears off would help to narrow the measurement errors.[10] González-Madruga et al.[11] analyzed the effect of measuring the force on the diameter by installing a force sensor on the probe.
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