Method for calibrating lengths of connecting rods of parallel double-joint coordinate measuring machine

Abstract

The invention relates to a technology for calibrating the lengths of connecting rods of a parallel double-joint coordinate measuring machine. For effectively calibrating the lengths of the connecting rods of the parallel double-joint coordinate measuring machine, the invention adopts the technical scheme that a rotating shaft arranged between a large connecting rod and a small connecting rod doesrotary motion, a rotating shaft at the other end of the large connecting rod is fixed, and then the length of the small connecting rod can be measured; the rotating shaft arranged between the large connecting rod and the small connecting rod is fixed, the rotating shaft at the other end of the large connecting rod does rotary motion, the length of the small connecting rod is used as a known quantity, meanwhile, the large connecting rod and the small connecting rod are on the same straight line, and then the sum of the lengths of the large connecting rod and the small connecting rod can be measured, thus the length of the large connecting rod is obtained. The technology is mainly used for calibrating the lengths of the connecting rods.

Description

technical field [0001] The invention relates to a calibration technology for the length of a connecting rod of a parallel double-joint coordinate measuring machine, and designs a calibration scheme for the length of a connecting rod of a parallel double-joint coordinate measuring machine by using the basic ideas of a parameter measurement method and an inversion method. It belongs to the field of testing technology and instruments. Specifically, it relates to a method for calibrating the length of a connecting rod of a parallel double-joint coordinate measuring machine. Background technique [0002] A parallel double-joint coordinate measuring machine belongs to non-orthogonal coordinate measuring equipment. Compared with the orthogonal coordinate measurement system, the non-orthogonal coordinate measurement system has the advantages of low cost, flexible movement, open measurement space, and suitable for on-site measurement. It has developed rapidly in recent years. The p...

AI Technical Summary

Problems solved by technology

[0007] The traditional method is to measure a certain number of standard samples with known parameters by the measuring machine, combine the parameters of each joint and their errors, and use the established mathematical model with errors to derive the normal equation of the least square method to obtain the length of each rod. However, this method introduces more error terms and the calibration accuracy is lower.

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