Method for constructing geometric digital twinning model of workpiece based on MBD process model

Abstract

The invention discloses a construction method of a workpiece geometric digital twinning model based on an MBD process model. The method is based on a CAD model and process information in an MBD process model. The actual geometrical shape of the workpiece is obtained through three-dimensional measurement; obtaining an ideal processing surface, an ideal processing reference surface, an actual processing surface and an actual processing reference surface through point cloud initial registration and process guidance point cloud segmentation; actual and ideal machining datum planes coincide to serve as constraints for fine registration, so that a coordinate system of three-dimensional measurement data is corrected to be consistent with a design coordinate system, a machining surface obtained through measurement is reconstructed on the basis, the machining surface in an ideal process model is replaced, and finally a workpiece intermediate geometric twinning model for each process is obtained. According to the method, the pertinence and effectiveness of registration are improved on the basis of process information, the geometric state change of the workpiece in the manufacturing process is digitally reserved, and manufacturing process tracing and manufacturing process improvement are facilitated.

Description

technical field [0001] The invention belongs to the field of part manufacturing process digitization, and in particular relates to a method for constructing a geometric digital twin model of a workpiece based on an MBD process model. Background technique [0002] Model Based Define (Model Based Define) digital design and manufacturing is the current development trend of manufacturing informatization. MBD takes the three-dimensional geometric model of the product as the core, and associates design information and manufacturing information with the three-dimensional geometric model. The 3D model associated with product attributes becomes the only basis in the manufacturing process, realizing the unification of information in the design and manufacturing process. [0003] Design-oriented MBD uses the final design model of the product as the carrier to present the final design requirements and manufacturing information; manufacturing process-oriented MBD uses the process model ...

AI Technical Summary

Problems solved by technology

However, in the current registration method, it is assumed that the importance of all points and surfaces of the part is equal, ignoring the particularity of the manufacturing process (that is, only the processing surface changes in one process), so that the registration result does not conform to the actual processing situation; at the same time The process information in the process model is not fully utilized, the registration time is long and the efficiency is low

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