A Method of Automatically Generating Hierarchical Exploded Graph

Abstract

The present invention provides a method for automatically generating hierarchical exploded diagrams, comprising the following steps: obtaining a three-dimensional CAD assembly diagram; extracting the constraint relationship between parts of an assembly in the three-dimensional CAD assembly diagram, and obtaining a contact-connection matrix and an extended interference matrix; Hierarchical assembly sequence planning; automatic generation of hierarchical exploded diagrams; the invention combines the technology of automatic generation of exploded diagrams with assembly modeling, assembly sequence planning and simulation, and proposes an extended interference matrix and its generation method , the ASP algorithm based on multi-rule screening, and the automatic generation method of the exploded diagram based on ASP realize the integrated process of assembly planning. The present invention "hierarchical" reforms each link of assembly planning, analyzes the advantages of "hierarchical" in the process of processing the generation of complex product explosion diagrams, and generates according to the assembly relationship matrix and its generation, sub-assembly planning, ASP algorithm and hierarchical explosion diagrams The process sequence is expanded sequentially.

Description

technical field [0001] The invention belongs to the technical field of exploded diagrams, in particular to a method for automatically generating hierarchical exploded diagrams. Background technique [0002] Complex products refer to a class of products with complex customer needs, complex product composition, complex product technology, complex manufacturing process, and complex project management, such as aero-engines, spacecraft, automobiles, and weapon systems. In order to reveal and analyze the internal structure of complex products and express the relative spatial position relationship between components, assembly designers need to construct another form of assembly drawing, that is, to separate the components in the assembly according to the specified order, direction and distance , forming an Exploded view. Although section views and perspective views can also reveal internal parts by eliminating the geometry that obstructs the display, exploded views can more clearl...

AI Technical Summary

Problems solved by technology

This method only ensures that the parts are separated, causing the parts to explode in a divergent manner, instead of exploding along the orthogonal coordinate axes. The exploded parts are not retroactive, and they lack connections in the same direction, so the assembly sequence cannot be reflected. ,like figure 1 As shown, (a) is the explosion effect diagram of the first layer, (b) is the explosion effect diagram of the third layer

When faced with complex products, its efficiency and effect are even less ideal and do not meet engineering requirements

[0016] The effective means to test the explosion effect is the complexity of the exploded assembly. After research, there are four main deficiencies in the existing technology: ① Too much human-computer interaction input information is required, and the geometric information that can be obtained automatically is not deeply excavated.

②The reasoning of the feasible explosion direction is inaccurate or time-consuming, and the explosion direction is limited to the ideal global coordinate system axis

③The assembly instance has a small number of parts and lacks an example of hierarchical structure explosion, which cannot reflect its ability to deal with complex product explosion diagrams

④ The influence of Assembly sequence planning (ASP) on optimizing the layout and visual effects of the exploded diagram is not considered from a global perspective

Moreover, the GCA method of human-computer interaction is extremely time-consuming to solve the feasible disassembly direction between parts, and it is not suitable for three-dimensional space and cannot be applied to complex products.

It can be seen that the existing research on hierarchical ASP generally requires manual input of matrix information or graph models, which is time-consuming and has great uncertainty in reconstructing the assembly structure, which does not conform to engineering reality, and is not suitable for the rapid generation of exploded graphs.

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