Abstract
Trigger probes are widely used in precision manufacturing industries such as coordinate measuring machines (CMM) and high-end computer numerical control(CNC) machine tools for quality control. Their performance and accuracy often determine the measurement results and the quality of the product manufacturing. However, because there is no accurate measurement of the trigger force in different directions of the probe, and no special measuring device to calibrate the characteristic parameters of the probe in traditional measurement methods, it is impossible to exactly compensate for the measurement error caused by the trigger force of the probe in the measurement process. The accuracy of the measurement of the equipment can be improved by abiding by the Abbé principle. Thus, in order to better evaluate the performance parameters of the probe and realize the accurate compensation for its errors, this paper presents a method which can directly measure the performance parameters of the trigger probe based on the Abbé measurement principle, expounds the measurement principle, the establishment of the mathematical model, and the calibration system, and finishes with an experimental verification and measurement uncertainty analysis. The experimental results show that this method can obtain the exact calibration errors of the performance parameters of the trigger probe intuitively, realize the compensation for the errors of the probe in the measurement process, and effectively improve the measurement accuracy.
Highlights
Trigger probes are widely used in coordinate measuring machines (CMM), high-end computer numerical control(CNC) machine tools, and other precision manufacturing applications, and are an important component of coordinate measuring machines and CNC machine tools
In order to accurately measure and calibrate the parameters of a trigger probe, this paper proposes a calibration method based on the Abbé principle and develops a calibration device that can directly measure the displacement change of the probe ball tip and simultaneously collect all signals based on a high-speed data acquisition circuit
It is convenient to calculate the parameter errors of the trigger probe, such as the pre-travel and other parameter errors. It can be seen from the measurement results and uncertainty analysis that this method can effectively meet the calibration requirements of trigger probes, and provide technical support for the precision calibration of trigger probe in CMMs and CNC machine tools in industrial applications
Summary
Trigger probes are widely used in coordinate measuring machines (CMM), high-end computer numerical control(CNC) machine tools, and other precision manufacturing applications, and are an important component of coordinate measuring machines and CNC machine tools. Proposed a three-dimensional theoretical model of a touch triggered probe, described and simulated its measurement feasibility, and performed experimental verification This method inevitably brings errors to the measurement results due to the use of a contact force displacement transducer ( it is emphasized that the measuring force is very small) to determine the contact position and trigger position during the contact of the probe and the tested part. The above methods are all based on the change of electronic voltage or force on the probe to measure the pre-travel, rather than directly monitoring the displacement change of the probe ball tip to calibrate the probe parameters This approach calculates the difference between the position of the trigger signal and the position of the actual measurement point based on the direct measurement of the trigger force in the measurement process. Based on the analysis of the above methods, this paper proposes a new method based on the Abbé measurement principle [21] to directly measure the parameter error of the trigger probe, which can directly obtain the calibration error of each performance parameter of the probe, and realize the error compensation of the measurement value in the measurement process
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