Space grid-based design method of three-dimensional lattice structure

Abstract

The invention provides a space grid-based design method of a three-dimensional lattice structure. The method comprises: 1, importing an initial three-dimensional entity model of the structure; 2, decomposing the structure, and selecting a design area; 3, selecting function surfaces, and deleting design area entities and non-function surfaces; 4, determining cell configurations and cell density ofall sub-region lattice structures; 5, generating lattice structure topology information in sub-regions; 6, constituting three-dimensional lattice structure information, and calculating the number of rod pieces; 7, inputting additive-manufacturing technology requirement parameters; 8, carrying out validity judgment on all the rod pieces; 9, calculating the number of invalid rod pieces; 10, calculating the ratio of the invalid rod member; 11, judging global validity; 12, constructing a lattice structure geometry model; and 13, carrying out merging operation on non-design areas, the function surfaces and the lattice structure to obtain a design model containing the lattice structure. According to the method, a design result well matches additive-manufacturing technology requirements and datainterfaces; and batch processing is employed, and higher skill and tedious work are avoided.

Description

Technical field: [0001] The invention relates to a three-dimensional lattice structure design method based on a space grid, and belongs to the technical field of mechanical structure design. Background technique: [0002] As a new type of structure in aviation, aerospace, automobile, medical and other fields, the truss-like lattice structure is widely used because of its light weight, high specific stiffness, high specific strength mechanical properties, shock absorption, energy absorption and other functional characteristics. Follow and apply. The three-dimensional lattice structure usually adopts the method of direct filling in the design area. This method has a small degree of design freedom and a low degree of designer participation. Designers cannot control the cell configuration, cell density, distribution form, and structural appearance of the lattice structure. , on the other hand, the direct filling method does not deal with the edge position of the design area eno...

AI Technical Summary

Problems solved by technology

The three-dimensional lattice structure usually adopts the method of direct filling in the design area. This method has a small degree of design freedom and a low degree of designer participation. Designers cannot control the cell configuration, cell density, distribution form, and structural appearance of the lattice structure. , on the other hand, the direct filling method does not deal well with the edge position of the design area, usually resulting in incomplete cell structures or independent members, forming structural defects

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