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Modeling method of gradient porous structure based on STL file

A gradient porous, modeling method technology, applied in the field of 3D modeling, to achieve the effect of simple and efficient modeling method, easy to understand and master, and realize the effect of adjustment range and controllability

Active Publication Date: 2020-09-18
INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a modeling method of gradient porous structure based on STL files, the purpose of which is to overcome the problem that the existing modeling method is difficult to quickly and efficiently establish a three-dimensional model of gradient porous structure , make full use of the characteristics of the STL file format to design a 3D model of the gradient porous structure with the required pore characteristics

Method used

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  • Modeling method of gradient porous structure based on STL file

Examples

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Embodiment 1

[0042]Establish a CAD model of the uniform periodic porous structure of the diamond unit, and design the overall appearance structure of the model as a frustum shape, with a radius of 5 on the upper surface, a radius of 6.7 on the lower surface, and a height of 10 frustum. The CAD model size of a single diamond unit is 2×2×2, where the porosity of a single unit is 50%. Since it is a unit periodic porous structure, the overall porosity of the porous structure CAD model is 50%. After the modeling is completed, it is saved as an STL file in ASCII file format.

[0043] The STL file is read in through a calculation program, and the direction vector and vertex coordinate data of the triangular surface of the porous structure CAD model are sequentially read, and the read data are processed. Specifically, by modifying the position parameters, the distance between the diamond unit brackets is reduced, so that the aperture size of the structure is reduced, and the aperture size of the eq...

Embodiment 2

[0047] Establish the CAD model of the uniform periodic porous structure of the diamond unit. The overall appearance of the model is cylindrical, the radius of the upper surface circle is 5, and the height of the cylinder is 10. The porosity of the unit is 50%, and since it is a unit periodic porous structure, the overall porosity of the porous structure is 50%. After the modeling is completed, save it as an STL file in ASCII file format.

[0048] The STL file is read in through a calculation program, and the direction vector and vertex coordinate data of the triangular surface of the porous structure CAD model are sequentially read, and the read data are processed. Specifically, by modifying the position parameters, the distance between the diamond unit brackets is reduced, so that the aperture size of the structure is reduced, and the aperture size of the equal height is kept consistent. direction, the aperture decreases continuously from top to bottom.

[0049] After the p...

Embodiment 3

[0052] For porous structures of other unit types, such as helical tetrahedral unit, tetrahedral unit, hexahedral unit, octahedral unit, etc., the CAD model of helical tetrahedral unit is given, and its operation process is the same as in Example 1 and Similar to Example 2, only the structure type of the porous structure is different, and the gradient porous structure with the porosity change of the unit type can be obtained.

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Abstract

The invention discloses a modeling method of a gradient porous structure based on an STL file. An existing gradient porous structure three-dimensional model design method generally has the problems that the modeling process is complex, the aperture size and shape are difficult to control and the like, and the problem that an existing modeling method is difficult to quickly and efficiently establish a gradient porous structure three-dimensional model is solved. According to the invention, the STL file is read through the calculation program; reading and storing the normal vector and the vertexcoordinate of the triangular patch of the CAD model of the uniform unit periodic porous structure into a corresponding array, and modifying the position parameter of the triangular patch stored in thearray by writing a program according to the structural characteristics of the uniform unit periodic porous structure design. The modeling method is simple, efficient and easy to understand and master, and gradient porous structures of different unit structure types can be designed by modifying program parameters.

Description

technical field [0001] The invention relates to the field of three-dimensional modeling, in particular to a modeling method of a gradient porous structure based on STL files. Background technique [0002] As a new type of lightweight structure, the porous structure has a wide range of applications in aerospace, biomedicine and other fields due to its open and connected space that can realize multifunctional properties such as energy absorption, energy storage, thermal control, stealth, and damping. As a special porous structure, the gradient porous structure has better designability and diversity, which makes it have unique advantages in impact resistance and energy absorption. [0003] With the rapid development of additive manufacturing technology, especially the development of selective laser melting technology, the preparation of various small and complex structures is possible, and it is also possible to effectively realize the processing and preparation of various comp...

Claims

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Application Information

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IPC IPC(8): G06F30/10G06F30/20G06F111/10
CPCG06F30/10G06F30/20G06F2111/10
Inventor 吴鸿飞王国伟王维荣孙凯华沈显峰杨家林李欣竹陈金明
Owner INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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