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Acta Aeronautica et Astronautica Sinica

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Ultraviolet structured light three-dimensional measurement method for geometric morphology of laser metal deposition forming process

  

  • Received:2023-10-13 Revised:2023-12-25 Online:2023-12-26 Published:2023-12-26
  • Contact: Jun-Peng XUE

Abstract: Laser metal deposition technology in the field of metal additive manufacturing has the application environment of strong light and radiation, which leads to the lack of means to obtain the 3D information of real-time geometric morphology of parts. In order to observe the forming process of metal layered discrete stacking, a real-time measurement method based on ultraviolet structured light for the measurement of three-dimensional geometric information of laser metal deposition forming process was proposed. Firstly, the radiation wavelength of metal powder under the action of laser and the ambient interference light such as laser were analyzed. Then the narrow-band interference free optical path in the optional UV band and jittered binary fringe grating are designed to ensure high-quality modulated fringe images; Secondly, the Fourier transform method is used to filter the fundamental frequency information of the object surface modulation in the frequency domain. The wrapped phase information is obtained through the inverse Fourier transform and the absolute phase calculation is realized with the flood filling algorithm. Finally, according to the principle of stereo vision, the phase is used as dense matching auxiliary information to achieve high-precision 3D data calculation. In the real environment of metal additive manufacturing, the three-dimensional measurement average error of the proposed method is verified to be less than 0.1mm through the measurement of standard parts. The observation experiments on the printing process of metal parts show that this method can be used to observe the changes of geometric information within and between layers in the forming process of additive manufacturing. It can meet the requirements of online dimension measurement and analysis of 0.2mm~1mm layer thickness accumulation process during the forming of parts. It also provides detailed intermediate data support for real-time closed-loop feedback and internal defect mechanism analysis of laser metal deposition technology.

Key words: three-dimensional measurement, metal additive manufacturing, fringe structured light, binocular vision, phase analysis

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