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A method for directly converting CT slices into 3D printing G codes
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A 3D printing and conversion technology, applied in the field of 3D printing, can solve problems such as errors, redundant data of STL file outline information, etc., and achieve the effects of simplifying the data processing process, smoothing the surface transition, and improving precision
Inactive Publication Date: 2019-04-26
CHONGQING UNIV
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[0002] At present, there are two main integration paths of industrial CT and 3D printing: 1) Industrial CT slice image→CAD model→STL file→3D printing data, in which the reconstruction of 3D CAD model accounts for 90%-95% of the reverse calculation time. %, while digital scanning only accounts for 5% to 10%, and the contour information of the STL file has a large amount of redundant data or even errors; 2) Industrial CT slice image → STL file → 3D printing data, although this method does not require CAD modeling , but cannot avoid the defects of STL files
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Embodiment 1
[0035] see figure 1 , a method for directly converting CT slices into 3D printing G codes, mainly including the following steps:
[0036] 1) Obtain several CT slice images of the object to be 3D printed.
[0037] 2) Preprocessing each CT slice image to obtain the geometric information of the slice image.
[0038] The geometric information mainly includes entities, outer contours, inner contours, segments and point sets. The entity is composed of inner and outer contours. The inner and outer contours are composed of segments. Fragments consist of several points. Geometry information such as figure 2 shown.
[0039] 3) Perform entity matching on adjacent slice images.
[0040] The method of entity matching is to calculate the coincidence degree of adjacent slices, such as image 3 As shown, A and B are the entities of adjacent slice images respectively, and C represents the coincidence degree of adjacent slice images. Entity matching includes one-to-one, one-to-two, or...
Embodiment 2
[0054] An experiment of printing a wheel hub by directly converting CT slices into 3D printing G code method, the main steps are as follows:
[0055] 1) Obtain several CT slice images of the hub.
[0056] 2) Preprocessing each CT slice image to obtain the geometric information of the slice image.
[0057] 3) Perform entity matching on adjacent slice images.
[0058] 4) Perform outer contour matching and inner contour matching on adjacent slice images. After the matching is completed, judge whether there is a bifurcation in the adjacent slice image, if yes, go to step 5, if not, go to step 6.
[0059] 5) Fork matching is performed on the adjacent slice images with forks, so that the adjacent slice images have a one-to-one correspondence.
[0060] 1) The inner contour and outer contour of adjacent slice image entities are split into segments, such as Figure 7 shown.
[0061] II) Match adjacent slice image segments, thereby converting the corresponding relationship of slice...
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Abstract
The invention discloses a method for directly converting CT slices into 3D printing G codes. The method mainly comprises the following steps: 1) obtaining a plurality of CT slice images of a to-be-3Dprinting object; And 2) geometric information of the slice image is obtained. And 3) performing entity matching, outer contour matching and inner contour matching on the adjacent slice images. And after the matching is completed, judging whether the adjacent slice images have bifurcations or not, if yes, turning to the step 4, and if not, turning to the step 5. And 4) performing bifurcation matching on the adjacent slice images with bifurcations. And 6) performing interlayer interpolation processing on two adjacent layers of slice images. And 7) filling and scanning each layer of data to obtain a scanning line, and coding the scanning line into a G code for 3D printing. According to the invention, the data processing process is simplified, the reverse solving period is shortened, and the matching precision and the 3D printing quality are improved while the bifurcation problem is effectively solved.
Description
technical field [0001] The invention relates to the field of 3D printing, in particular to a method for directly converting CT slices into 3D printing G codes. Background technique [0002] At present, there are two main integration paths of industrial CT and 3D printing: 1) Industrial CT slice image→CAD model→STL file→3D printing data, in which the reconstruction of 3D CAD model accounts for 90%-95% of the reverse calculation time. %, while digital scanning only accounts for 5% to 10%, and the outline information of the STL file has a large amount of redundant data or even errors; 2) Industrial CT slice image → STL file → 3D printing data, although this method does not require CAD modeling , but it cannot avoid the defects of STL files. Contents of the invention [0003] The purpose of the present invention is to solve the problems existing in the prior art. [0004] The technical solution adopted to achieve the purpose of the present invention is as follows, a method f...
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