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An online measurement method based on line laser scanning for large forgings

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Abstract

In order to realize the size measurement of large forgings in thermal state, an online measurement method based on line laser scanning is proposed in the paper. The measurement system mainly consists of a line laser projector and a charge-coupled device (CCD) camera. The laser projector is driven by the stepper motor for scanning the forgings continuously, while real-time images are captured by the CCD to provide the information for further feature extraction. First of all, particle swarm optimization algorithm is utilized to reduce the optical distortion error between actual and ideal images as a kind of optimization method. Secondly, the preprocessing is carried out to improve the image quality of the hot parts, and further two-dimensional image information of the forgings is obtained by means of center extraction. Thirdly, the size of forgings is calculated through processing the data acquired by continuous scanning the forgings and the real-time shotting. Finally, the measurement of forgings on overall outside size is achieved. The method proposed in the paper is viable according to the experiment results.

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Correspondence to Yu-cun Zhang.

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Zhang, Yc., Han, Jx., Fu, Xb. et al. An online measurement method based on line laser scanning for large forgings. Int J Adv Manuf Technol 70, 439–448 (2014). https://doi.org/10.1007/s00170-013-5240-2

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  • DOI: https://doi.org/10.1007/s00170-013-5240-2

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