A Four-Point Cylindricity Measurement Method Based on Singularity Analysis

Abstract

The present invention discloses a four-point cylindricity measurement method based on singularity rate analysis. The method comprises the steps of: measuring multi-circle measurement signals collectedthrough axial three-sectional four sensors to obtain the shape of the section of a measured cylinder and shafting runout and mixed signals of straight line error motion of a measurement rack; according to a prior section shape signal period, employing the singular value decomposition method to obtain fundamental wave signals, and performing singularity rate spectral analysis for residual signalsto measure the section runout period; and employing addition of measurement signals of diametrical sensors and a sequence vector three-point straightness error separation method to remove various error motions in the measurement process to obtain an actual section shape and obtain relative radius, the unrounded degree and the least-squares centre vector of each section circle, and fitting and measuring the space bending middle line of the measured cylinder to achieve measurement reconstruction of the silhouette of the cylinder defined based on the international standard. The number of the sensors is small, the antijamming capability is high, and the measurement system is simple in structure.

Description

technical field [0001] The invention relates to the field of precision testing technology and the design and manufacture of large-scale in-situ measurement equipment, in particular to a four-point cylindricity measurement method based on singularity analysis for large-scale cylinder cylindricity measurement. Background technique [0002] Large-scale precision shaft rollers are the core components used in the production of large-scale solar panels, ship and automobile steel plates, LCD screens, high-quality paper, etc. in the fields of new energy, ships, ships, papermaking, and mining. The length of several meters, the accuracy of its profile, that is, errors such as cylindricity errors will be copied to the products produced, which are important factors that determine the surface quality of products. Therefore, the shape detection accuracy of large-scale shaft parts marks the technical level of a country's high-end equipment manufacturing industry and the international compe...

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Problems solved by technology

Based on this, many scholars have proposed a 5-6 point cylinder profile measurement method [Gao W, Yokoyama J, Kojima H, Kiyono S.2002 Precision measurement of cylinder straightness using a scanning multi-probe system. Precis Eng.26 279-288] However, systematic factors such as the consistency of multi-sensor characteristics restrict the anti-interference ability of the measurement system and increase the source of error

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