REVO measuring head B-axis zero error calibration method

Abstract

The invention discloses an REVO measuring head B-axis zero error calibration method applied to a non-orthogonal coordinate measurement system and belongs to the field of precision test technologies and instruments. The method comprises the steps that a square ruler is placed on a flat plate which is placed horizontally, and one working face M of the square ruler is fixed after being adjusted to beparallel to the X-direction of a measuring machine; a flat ruler is fixed after being closely attached to a working face N perpendicular to the working face M of the square ruler; three principal axes of the measuring machine are kept static, an A-axis of an REVO measuring head is placed at an appropriate position, and a B-axis of the REVO measuring head rotates to detect two symmetric points onthe flat ruler; and according to calculation of B-axis angles of the two detection points, a zero error of the B-axis of the measuring head can be calibrated. According to the method, under the statethat the three principal axes of the measuring machine are static, the situation that the angle of a joint arm is changed due to measuring force generated in the calibration process, and consequentlyan additional calibration error is introduced is avoided, high-precision calibration of the zero error of the B-axis of the REVO measuring head is realized, and the method can be applied to precisionmeasurement.

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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