REVO head is a high efficiency and accuracy five-axis measuring system designed and applied on coordinate measuring machine. It is now widely used in the measurement of precision parts of aircraft engine. As a high precision and high efficiency measurement system, the accuracy of the measurement result can only be guaranteed, in the case of ensuing the correctness of the measurement methods. This papers presents two measurement methods of REVO five-axis head based on coordinate measuring machine, using an NPL designed and manufactured freeform material standard consisting of an aluminium block with geometric shaped blended to form a pseudo freeform surface as a measurement example. By comparing the result of REVO five-axis head CMM and the result given by NPL. The accuracy of the measurement method can be verified. And then combined with the results, this paper explores how to better ensure the accuracy of measurement results. This has profound effect on future precision-parts measurement.
Pressure transducer is widely used in the field of industry. A calibrated pressure transducer can increase the performance of precision instruments in the closed mechanical relationship. Calibration is the key to ensure the pressure transducer with a high precision and dynamic characteristic. Unfortunately, the current calibration method can usually be used in the laboratory with a good condition and only one pressure transducer can be calibrated at each time. Therefore the calibration efficiency is hard to meet the requirement of modern industry with high efficiency. A dynamic and fast calibration technology with a calibration device and a corresponding data processing method is proposed in this paper. Firstly, the pressure transducer to be calibrated is placed in the small cavity chamber. The calibration process only contains a single loop. The outputs of each calibrated transducer are recorded automatically by the control terminal. Secondly, LabView programming is used for the information acquisition and data processing. The performance of the repeatability and nonlinear indicators can be figured out directly. At last the pressure transducers are calibrated simultaneously in the experiment to verify the suggested calibration technology. The experimental result shows this method can be used to calibrate the pressure transducer in the practical engineering measurement.
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