May 05, 2024

Research on Virtual Technology in Stamping Line Assembly Simulation (5)

Virtual press line simulation run

1, the press line virtual assembly environment construction

A virtual environment is a simulated three-dimensional space built on a computer that is the basis for the entire virtual assembly system to function. The virtual assembly environment in this paper uses CATIA's Real Time Rendering environment module, the content of which is shown in Figure 4.

The stamping line model library is the main content of the virtual environment, and it is the process of digital digitizing the press line. In order to make the virtual environment system closer to reality, the digital model must be processed in terms of light, color, texture sound, etc., so that the virtual assembly simulation can be visually realistic.

The rendering process of complex multi-model entities such as automobile body press lines can reduce the overhead of real-time drawing by constructing LOD for modeling, thereby speeding up browsing. LOD is the English abbreviation of Level of Detail. The main idea is to construct a set of three-dimensional models that can display the number of different polyhedrons according to their distances and visual characteristics in the virtual scene. When the model is driven, according to the established rules, the corresponding display hierarchy is selected, so as to achieve the real-time simplified model without affecting the visual effect.

2, the assembly simulation driver

The moving elements of the press line mainly include the movement of the inner/outer slider of the press; the movement of the upper/lower air cushion; the movement of the mold clamp; the movement of the moving table; the movement of the destacking machine, the washing machine, and the centering stage. The Kinematics Simulator module of CATIA's Digital Mockup function is used to perform motion constraint processing on each moving element of the press line, including adding a spherical high pair, a cylindrical high pair, a spherical low pair, a ball pin pair, Cylindrical sleeve pair, rotating pair, moving pair and other motion constraints.

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