Reverse construction method and system for automobile typical parts

Abstract

The invention relates to a reverse construction method and system for automobile typical parts. The reverse construction method comprises the following steps: carrying out three-dimensional measurement on a sample automobile typical part to obtain automobile body point cloud data, and carrying out regional modeling on the automobile body skeleton part point cloud data and non-sheet metal part point cloud data to obtain a plurality of skeleton part basic feature curved surfaces and a typical structural part regional model; splicing the basic characteristic curved surfaces of the framework pieces to obtain basic characteristic curved surface transition surfaces of the framework pieces, and processing the basic characteristic curved surface transition surfaces of the framework pieces to obtain a vehicle body structural surface; respectively processing each typical structural part region model by adopting a section plane method to obtain a plurality of sketch contours and processing each sketch contour into a plurality of basic curved surfaces; and stitching the plurality of basic curved surfaces to obtain a stitched curved surface, and operating the stitched curved surface to obtain the non-sheet metal part model. According to the method and system, the construction accuracy of the automobile typical parts can be improved, and the constructed automobile body better conforms to theexpected effect.

Description

technical field [0001] The invention relates to the field of reverse design, in particular to a method and system for reverse construction of typical automobile parts. Background technique [0002] The current reverse design of typical automotive parts mainly depends on the designer's experience and software application level, which will inevitably make the efficiency and quality of the reverse modeling different, with greater uncertainty, and the current domestic research on reverse engineering In the application of automobiles, a unified method of processing the A surface is used to reconstruct the typical parts of the automobile, and there are relatively few reverse design researches on the structural parts that affect the performance of the automobile. They are all load-bearing parts, and the structural shape is often very complex, with many small and complicated geometric features. Whether it is a sheet metal part or a plastic part, the quality of its reverse design is ...

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Problems solved by technology

[0002] The current reverse design of typical automotive parts mainly depends on the designer's experience and software application level, which will inevitably make the efficiency and quality of the reverse modeling different, with greater uncertainty, and the current domestic research on reverse engineering In the application of automobiles, a unified method of processing the A surface is used to reconstruct the typical parts of the automobile, and there are relatively few reverse design researches on the structural parts that affect the performance of the automobile. They are all load-bearing parts, and the structural shape is often very complex, with many small and complicated geometric features. Whether it is a sheet metal part or a plastic part, the quality of its reverse design is directly related to the load-bearing performance of the car, which in turn affects the overall performance. The structural performance of the car, therefore, the existing technology adopts a unified method to treat different types of parts such as the body and the engine in the same way, which will easily cause the parts constructed in the later stage to be compared with the expected ones, and the reconstruction method will increase the difficulty and obtain parts. Increased irrationality

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