Method of automatically generating layering exploded view

Abstract

The invention provides a method of automatically generating a layering exploded view. The method comprises the following steps of obtaining a three-dimensional CAD (Computer Aided Design) assembly drawing; extracting constrained relationships among parts of an assembly body in the three-dimensional CAD assembly drawing to obtain a contact-connection matrix and an extension interference matrix; planning a layering assembly sequence; automatically generating the layering exploded view. According to the method, an automatic exploded view generating technology and assembly modeling, assembly sequence planning and simulation technologies are combined for research, the extension interference matrix and a generation method of the extension interference matrix are provided, and the integrated flow of the assembly planning is realized on the basis of a multi-rule screening ASP (Assembly Sequence Planning) algorithm and an automatic exploded view generation method based on the ASP. According to the invention, each link of the assembly planning is remolded by layering, the advantages of the layering used for processing the complicated product exploded view generation process are analyzed, and according to the assembly relationship matrix, the assembly relationship matrix generation, a sub assembly body planning, the ASP algorithm and the layering exploded view generation flow sequences, the procedures are carried out in sequence.

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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