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Research on off-line programming method of spatial intersection curve welding based on VTK

Abstract

Robot off-line programming is widely used in the field of spatial intersection curve welding. However, several existing problems are needed to be resolved which include the following: the operation process depends on the third-party CAD software, the welding trajectory planning depends on the precise analytical formula, and the determination of welding posture lacks fusion of geometrical features of surrounding surfaces. This paper presents an off-line programming method of spatial intersection curve welding based on visualization toolkit (VTK). In this method, the visualization pipeline and observer/command mode of VTK are used to display the 3D model of the robot welding system and pick up the surfaces around the welding seam respectively. By calculating the normal vectors of the picked surfaces, the equidistant cutter planes perpendicular to these surfaces can be automatically created to form the planning weld nodes on the intersection of the surfaces, and the position and posture of the welding torch on weld nodes can be extracted. Furthermore, the position and posture along the weld curve are discretized by B-spline curve interpolation and quaternion spherical linear interpolation, respectively. Finally, the motion simulation is realized by the application of robot inverse kinematics. This method does not depend on the specific form of intersection, and all calculation processes are completed within the system, avoiding tedious external data calculation and import process. The correctness and practicability of the method are verified by the welding experiment of saddle-shaped cylindrical intersection pipes.

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Acknowledgments

The research of this paper is supported by the National Natural Science Funds of China (61703200) and Jiangsu Natural Science Foundation Project (BK20181024).

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Correspondence to Lei Hong.

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Hong, L., Wang, B., Xu, Z. et al. Research on off-line programming method of spatial intersection curve welding based on VTK. Int J Adv Manuf Technol 106, 1587–1599 (2020). https://doi.org/10.1007/s00170-019-04656-4

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  • DOI: https://doi.org/10.1007/s00170-019-04656-4

Keywords

  • Off-line programming
  • Welding
  • Spatial intersection curve
  • Visualization toolkit (VTK)