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Using a Line Laser to Achieve the Non-contact Dimension Measurement of a Large Thermal Forging
X.B. Fu, J.X. Han, Y.C. Zhang and S. Zhou

Due to the fact that large forgings are critical components in the large machinery equipments, the dimensions measurement of the key parts plays an important role in the forging process. A non-contact real-time dimension measurement system based on green laser scanning for the large thermal forgings is proposed in this paper. First of all, the mathematical measurement model is established. The mapping relationship between the two-dimensional (2-D) image and the three-dimensional (3-D) outside dimensions of forgings can be acquired. Secondly, a light plane translational scanning model is derived, and the optical centre motion trail is calculated by using linear regression analysis in this paper. Finally, the measurement of forging’s overall outside dimensions is realized by a data fusion of each section’s dimension information through continuous scanning the forging and the real-time capturing images. The experimental results demonstrate that the measurement method proposed in the paper is viable.

Keywords: Green line laser, large thermal forgings, non-contact real-time measurement, outside dimensions, optical centre motion trail, linear regression analysis

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