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Path generation method and system for 3D printing shell structure

A shell structure and path generation technology, applied in the field of 3D printing, can solve the problems of not considering the continuity of the path, the quality of the printing result is not high, and the quality of the model surface is affected, so as to improve the quality of the model, shorten the printing time and improve the printing quality and speed effect

Active Publication Date: 2022-04-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The inventor found that there are two main types of existing methods, one type does not consider the continuity of the path, and generates the printing path through general software slices, such printing results are of low quality and often fail to print
The other type can generate a strictly continuous printing path, but requires additional paths to connect the model with the support structure, and the support needs to be removed manually later, which is extremely difficult for the shell model, and it is easy to cause the model to break, and Will affect the surface quality of the model

Method used

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  • Path generation method and system for 3D printing shell structure
  • Path generation method and system for 3D printing shell structure
  • Path generation method and system for 3D printing shell structure

Examples

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Embodiment 1

[0070] like figure 1 and figure 2 As shown, this embodiment provides a method for generating a path for a 3D printing shell structure, which specifically includes the following steps:

[0071] S101: Based on the shell model data, determine the model printing posture.

[0072] In a specific implementation, the shell model data is stored in the form of stl or obj files.

[0073] In step S101, the process of determining the model printing posture is as follows:

[0074] S1011: Find all placement postures that meet the support constraints based on the shell model data.

[0075] In the process of finding a pose that meets the support constraints, it is required that all the support structures required by the model fall on the ground (there is no case of falling on the model itself), so it is necessary to screen out the pose that meets the constraints first.

[0076] First, sample uniformly on the Gaussian sphere. Each sampling point corresponds to a pose. Each pose is sliced ​...

Embodiment 2

[0112] This embodiment provides a path generation system for 3D printing shell structures, which specifically includes the following modules:

[0113] A print placement posture determination module, which is used to determine the print placement posture of the model based on the shell model data;

[0114] The first graph construction module is used to slice the shell model of the determined printing posture layer by layer, use each corresponding continuous line segment as a node, and then construct the first graph based on the laziness of the nodes;

[0115] The first graph node merging module is used to merge the nodes on the first graph to generate the second graph based on the principle that at least two edges point to the same node or at least two edges start from the same node;

[0116] The second graph node merging module is used for merging nodes on the second graph based on the minimum path coverage principle with dependency constraints to generate a third graph;

[0...

Embodiment 3

[0121] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps in the above-mentioned method for generating a path for a 3D printed shell structure are implemented.

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Abstract

The invention provides a path generation method and system for a 3D printing shell structure. The method comprises the following steps: determining a model printing and placing posture based on shell model data; slicing the shell model of which the printing placement posture is determined layer by layer, taking each correspondingly obtained continuous line segment as a node, and constructing a first graph based on the dependency of the node; combining nodes on the first graph to generate a second graph; combining nodes on the second graph to generate a third graph; combining the nodes on each third graph; for two nodes trying to be combined on the two third graphs with only one path, combining sub-nodes corresponding to the two nodes trying to be combined in the second graph based on layer thickness constraint, and iteratively combining until no node capable of being combined exists in the third graphs; and performing path planning by taking the shortest total connection path represented by all nodes in the third graph after the nodes are merged as a target, calculating connection points of each layer, generating a final printing path, and outputting a printable file.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a path generation method and system for 3D printing shell structures. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The shell structure means that there is only a thin layer of material on the surface of the object within its volume without internal fillers. It is widely used in fields such as rocket engine bodies, aircraft bodies, boilers in the oil and gas industry, and arts and crafts. Extruded ceramic printing is an efficient method for fabricating shell structures. [0004] Ceramics have many excellent physical and chemical properties, such as high temperature resistance, high hardness, corrosion resistance, low density, etc., and are widely used in various fields such as construction, chemical industry, and daily use. ...

Claims

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Application Information

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IPC IPC(8): B28B1/00B28B17/00B33Y50/00B33Y50/02G06T17/00
Inventor 吕琳钟凡超许永来赵海森屠长河
Owner SHANDONG UNIV
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