A calibration method for b-axis zero error of revo probe

Abstract

The invention discloses a method for calibrating the B-axis zero error of a REVO probe, which is applied to a non-orthogonal coordinate measurement system and belongs to the field of precision testing technology and instruments; the invention comprises the following steps: placing a square ruler on a flat plate placed horizontally, placing Adjust the working surface M of the square ruler to be parallel to the X direction of the measuring machine and then fix it; fix the square ruler close to the working surface N perpendicular to the working surface M of the square ruler; keep the three main axes of the measuring machine stationary, so that the A axis of the REVO probe is in a suitable position , Use the B-axis rotation of the REVO probe to detect two symmetrical points on the ruler; according to the calculation of the B-axis angle of the two detection points, the zero error of the B-axis of the probe can be calibrated. When the three main axes of the measuring machine are stationary, the present invention avoids the situation that the angle of the articulated arm changes due to the measurement force during the calibration process and introduces additional calibration errors, and realizes high-precision calibration of the B-axis zero error of the REVO probe, which can Used in precision measurement.

Description

technical field [0001] The invention discloses a method for calibrating the B-axis zero position error of a REVO measuring head, belonging to the field of precision testing technology and instruments. Background technique [0002] REVO probe is a five-axis probe launched by British Renishaw Company representing the most advanced contact scanning coordinate measurement technology in the world. In the field of engines, its measurement efficiency can be increased by more than 900%, and it has been widely used. [0003] The REVO five-axis measuring system is designed and used based on an orthogonal three-coordinate measuring machine. In the environment where the stroke of the orthogonal three-coordinate measuring machine is not less than 500mm×500mm×250mm, you can use the calibration program that comes with the REVO five-axis measurement system to quickly and automatically calibrate the parameters such as the B-axis zero error of the REVO probe. After calibration The value is d...

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Problems solved by technology

Chinese invention patent (a zero calibration method for articulated arm coordinate measuring machines, authorized announcement number: CN 103630096 B) and teacher Li Xinghua and others in the paper "A study on machine calibration techniques" (Li X, Zhang G, Liu S, et al. A study on machine calibration techniques[J]. CIRP Annals - Manufacturing Technology, 2013, 62(1):499-502.) proposed a calibration method for the B-axis zero error of the REVO probe, but In the proposed calibration method, the probe is detected parallel to the direction of the articulated arm of the measuring machine. During detection, the measuring force when the probe ball detects the working surface will react on the articulated arm; the length of the articulated arm is longer , the small force on the measuring end will also cause a corresponding change in the angle of the articulated arm; the change in the angle of the articulated arm, after being amplified (the magnification is the same as the length of the articulated arm), will cause a large displacement of the center of the REVO probe, thus It also causes changes in the measurement angle of the B-axis of the probe, and finally introduces additional errors in the calibration process of the zero error of the REVO probe B-axis

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