A scanning point cloud and digital CAD curved surface displacement deviation extraction method

A technology of displacement deviation and extraction method, which is used in electrical digital data processing, special data processing applications, instruments, etc. to achieve accurate and reliable displacement deviation.

Pending Publication Date: 2019-05-21
浙江铁牛汽车车身有限公司
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for extracting the displacement deviation between the scanned point cloud and the digital CAD curved surface, so as to solve the problem of extracting the displacement deviation between the scanned point cloud and the digital CAD curved surface

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  • A scanning point cloud and digital CAD curved surface displacement deviation extraction method

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Embodiment Construction

[0016] In order to solve the problem of displacement deviation extraction between scanned point cloud and digital CAD surface from the root. refer to figure 1 As shown, the present invention provides a method for extracting displacement deviation between scanned point cloud and digital CAD surface, comprising the steps of:

[0017] Step S1, discretize the digital CAD surface of the stamping part in the finite element analysis software, and assign the material properties of the finite element analysis;

[0018] Step S2, discretizing the scanned point cloud of the forming surface of the upper mold and the lower mold in the finite element software, and defining it as the upper mold and the lower mold of the forming mold;

[0019] Step S3, the discrete digital CAD surface is formed in the upper mold and the lower mold defined by the scanned point cloud, the grid is prohibited from splitting and refining during the forming process, and finally the digital CAD surface grid consiste...

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Abstract

The invention discloses a scanning point cloud and digital CAD (Computer Aided Design) curved surface displacement deviation extraction method, which comprises the following steps of: S1, discretizinga digital CAD curved surface of a stamped part in finite element analysis software, and endowing the discretized digital CAD curved surface with material attributes of finite element analysis; S2, performing discrete processing on the scanning point clouds of the forming surfaces of the upper die and the lower die in finite element software, and defining the scanning point clouds as the upper dieand the lower die of the forming die; S3, forming the discrete digital CAD curved surface in an upper die and a lower die defined by the scanning point cloud, prohibiting the grid from being split and refined in the forming process, and finally obtaining a digital CAD curved surface grid consistent with the scanning point cloud in shape; And S4, as the curved surface grid nodes before and after deformation are in one-to-one correspondence, extracting displacement deviation information of the scanning point cloud and the digital CAD curved surface from the corresponding nodes. According to theinvention, the accurate and reliable displacement deviation of the scanning point cloud and the digital CAD curved surface can be obtained.

Description

technical field [0001] The invention relates to the technical field of automobile molds, in particular to a displacement deviation extraction technology for digital CAD surface deformation. Background technique [0002] All digital CAD software currently on the market is limited by the problem of the displacement deviation between the digital CAD surface and the actual scanned point cloud data. The displacement deviation vector field required for surface deformation cannot be accurately extracted, which will cause deformation of the digital CAD surface. The problem of inaccuracy loses the meaning of engineering application. The general idea is to extract appropriate points from the scanned point cloud and project them onto the digital CAD surface, but in many cases, the normal projection point is not the same part in the topological sense of the scanned point cloud and the digital CAD surface, and the software cannot accurately Identify which point on the scanned point clou...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 何建生胡宾王金枝童子娟
Owner 浙江铁牛汽车车身有限公司
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