Study on reverse engineering of gear surface

Mainly from the perspective of reverse engineering, this paper studies the three-dimensional geometry of the gear surface and establishes its three-dimensional solid model, so as to prepare for the analysis of its friction and wear performance in the process of gear meshing transmission in the future. Specific work has been done in the following aspects:

  1. The basic concepts, methods, research status and application fields of reverse engineering are summarized. This paper briefly introduces the process of special software surfacer.
  2. The advantages and disadvantages of contact measurement and non-contact measurement are compared, and the measurement method suitable for this experimental study – non-contact measurement is selected. The three-dimensional measurement of the gear surface is carried out on the 3D scanner laser scanner to obtain the three-dimensional point group data of the gear surface.
  3. The original point group of the obtained gear is preliminarily processed, the noise of the scattered point group is removed by manual method, and some of the scanned point groups are processed. Finally, a relatively complete tooth shape is processed. The scanned arc (see Fig. 1) is used to fit the central circle (see Fig. 2). The position of the central axis of the gear and other information can be obtained by fitting the circle.
  4. The methods of surface model reconstruction in surfacer software are compared and analyzed. Finally, the method of surface stitching is determined to generate the gear surface model. Due to the symmetry of the gear structure and the complexity of the overall scanning, the first thing to get is a tooth profile surface. Using the positioning information of the fitting circle center, the processed tooth profile is copied, and finally the complete gear profile surface is obtained. Because the gear 3D surface obtained by surfacer has no thickness, if the finite element analysis is needed, its solid model must be constructed. Therefore, the reconstructed surface is imported into UG software to obtain the gear 3D geometric solid model.
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