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Supportless 3D printing method based on five-axis printing platform

A printing platform, 3D printing technology, applied in the direction of 3D object support structure, additive manufacturing, processing data acquisition/processing, etc., can solve the problems of wasteful post-processing process of printing materials, long printing time, damage of printed parts, etc. Process, reduce printing time, improve the effect of quality

Active Publication Date: 2018-03-23
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using this process to print cantilever and hollow structures, since there is no base material, they can only be printed by adding supports, and most of the printed parts usually have similar structures, so when using the FDM process to print, Due to the necessity of support, it will lead to long printing time, waste of printing materials and cumbersome post-processing process, and may even cause damage to the print when removing the support material.

Method used

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  • Supportless 3D printing method based on five-axis printing platform
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  • Supportless 3D printing method based on five-axis printing platform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] see Figure 8 , the present embodiment is based on the unsupported 3D printing method of the five-axis printing platform, which is characterized in that: the operation steps are as follows: (1) the model to be printed is converted into an STL model composed of triangular faces (STL files are used in computer graphics applications In the system, a file format used to represent triangular meshes), extract the characteristic edges of the printed model; (2) perform block processing on the characteristic edges of the printed model according to the needs, and determine the main module after block. The model to be printed will leave a section on the main module due to the block cutting, and take the center of gravity of the section as the reference point of this surface; (3) Calculate the angle between the stacking direction of each block manufacturing and the main module manufacturing stacking direction (4) each block is rotated by the X axis according to the included angle c...

Embodiment 2

[0048] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0049] In the step (1), the method for extracting the model feature edge is: traverse the triangular faces of the whole model, and calculate the dihedral angles of adjacent triangular faces, thereby judging the structural features:

[0050]

[0051] Among them, N is the normal vector of A triangular surface, J is the normal vector of B triangular surface, is the included angle between two adjacent triangular faces, set when When it is greater than 10°, the intersecting edge of two patches is considered as a feature edge.

[0052] In described step (2), the method to model block is:

[0053] (2-1) Set the part that can be printed without any support, that is, the model that is not cut from the 3D model, as the main module;

[0054] (2-2) Calculate the center of gravity (a j , b j , c j );

[0055] (2-3) Recognize the feature edge of the divided model according to...

Embodiment 3

[0067] Such as figure 1 as shown, figure 1 On the left is the model to be printed, figure 1 On the right is the model 1 and its supporting part 2 to be printed. For the traditional FDM process, if no support is added, the cantilever parts on both sides of the model will not be printed.

[0068] Such as figure 2 As shown, it is the five-axis printing platform required in this example, with a total of five degrees of freedom, namely X, Y, Z, A, and C. Among them, X, Y, and Z are the existing degrees of freedom of traditional 3D printers, and the two degrees of freedom A and C respectively realize the rotational movement of the receiving platform around the Y and Z axes. The unsupported 3D printing method based on this platform, that is, through the addition of two degrees of freedom, when printing the part of the cantilever structure, by rotating, the part can be printed with the already formed part as the base, so as to achieve unsupported the goal of.

[0069] Such as ...

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Abstract

The invention relates to a supportless 3D printing method based on a five-axis printing platform. The supportless 3D printing method based on five-axis printing platform comprises the operation stepsthat feature edges are extracted, partitioning, rotating and slicing treatment is conducted on a mold, the printing transformation relationship of all blocks is determined, and G-codes are recombined.Through the five-axis printing platform, the A axis and the C axis of the platform can be rotated by corresponding angles, a model needing support is rotated to a plane with a base, and then supportless print is achieved. The supportless 3D printing method based on five-axis printing platform has the advantages that the printing time can be greatly shortened, the printing materials are saved, theoperation of removing support is not needed, open source hardware and software are applied, operation is easy, the supportless 3D printing method is suitable for most of 3D printers based on FDM technical principle, and the supportless 3D printing method has broad application prospect.

Description

technical field [0001] The present invention mainly relates to the field of three-dimensional printing (Three Dimension Printing, 3DP), in particular to an unsupported 3D printing method based on a five-axis printing platform. Background technique [0002] In recent years, 3DP technology has been widely used in the development of new products due to its advantages of rapid and free manufacturing of complex three-dimensional structures, which greatly shortens the development cycle of new products and improves the production efficiency and manufacturing flexibility of new products. The essence of its manufacturing is no longer to remove unnecessary materials, but to obtain the required shape and function by layering materials. For example, in the field of aerospace, in order to reduce the weight of the spacecraft, spare parts will not be transferred to the spacecraft. When a part is damaged, 3DP technology can help astronauts make parts in the spacecraft for repair. In short,...

Claims

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Application Information

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IPC IPC(8): B29C64/118B29C64/20B29C64/393B33Y30/00B33Y50/02
CPCB33Y30/00B33Y50/02
Inventor 张海光孙泽丰胡庆夕刘大利
Owner SHANGHAI UNIV
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