Research on Visual Measurement Method of High Temperature H-beam Section Size

doi:10.3901/JME.2025.06.043

Abstract

Abstract: Aiming at the current measurement requirements of high temperature H-beam section size, a high temperature H-beam section size measurement system composed of multi-camera and linear laser sensors is designed and built. The system consists of four laser triangle model subsystems. The subsystems measure the size of the steel in the corresponding direction and splicing method is adopted to realize the measurement of the section size of the steel. Zhang’s calibration method and plane fitting method are used to calibrate the subsystem respectively, and the calibration accuracy is evaluated by the gauge block. The experimental results show that the accuracy can reach ±0.05 mm. Aiming at the problem of unevenness and disconnection of light stripe caused by oxide scale and other impurities on the surface of high temperature H-beam, a light stripe center extraction algorithm based on local regression analysis and quadratic fitting correction and a visual measurement method of H-beam section size based on analog caliper measurement are proposed. The experimental results show that the accuracy of high temperature H-beam measurement can reach ±0.5 mm, and the average processing time of each image is 0.24 s, which provides size data support for the closed-loop control in the production process of hot rolled H-beam.

Key words: high temperature H-beam, section size measurement, calibration accuracy evaluation, light stripe center extraction, visual measurement

CLC Number:

TP274

DU Wangzhe, CHEN Kanghui, LI Xuwei, LIU Yuanming, ZHENG Xianguang, ZHAO Xuexia, WANG Tao, WANG Zhihua. Research on Visual Measurement Method of High Temperature H-beam Section Size[J]. Journal of Mechanical Engineering, 2025, 61(6): 43-52.

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