3D (three-dimensional) printing and scanning method, 3D printing and scanning system and 3D printer

Abstract

An embodiment of the invention provides a 3D (three-dimensional) printing and scanning method, a 3D printing and scanning system and a 3D printer, and relates to the technical field of 3D printing. The 3D printing and scanning method includes steps of parsing model files to be subjected to 3D printing so as to determine connected entity sections about printing objects; parsing a plurality of boundary elements in the entity sections; generating boundary element scanning paths, to be more specific, determining Thiessen polygons corresponding to the boundary elements and generating scanning pathsegments for the boundary elements according to the maximum offset distances from the boundary elements to the Thiessen polygons and preset offset distance thresholds. The 3D printing and scanning method, the 3D printing and scanning system and the 3D printer have the advantages that the scanning path segments corresponding to the Thiessen polygons are drawn up on the basis of the characteristic that the distances from all points inside closed polygonal regions of the Thiessen polygons to the corresponding boundary elements are shorter than the distances from all the points to the other boundary elements, and accordingly the printing precision still can be effectively guaranteed even if each contour offset distance is longer than a half of the wall thickness of a thin wall.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a 3D printing scanning method, system and 3D printer. Background technique [0002] The current laser 3D printing scanning methods are generally divided into linear filling, circular filling and spiral filling, such as Figure 1A to Figure 1C Shown are the effect diagrams of the workpieces generated by the 3D printing scanning paths of linear filling, circular filling and spiral filling respectively. pass Figure 1A and Figure 1B It can be seen intuitively from the diagram that the two path generation methods of linear filling and circular filling have obvious step effect during 3D printing. When the angle between the part boundary contour and the scanning direction is small, the step effect is more obvious. Seriously affects the forming accuracy of 3D printing; Figure 1C The method of offsetting the boundary contour is used for generation, so in principle, the generatio...

AI Technical Summary

Problems solved by technology

pass Figure 1A and Figure 1B It can be seen intuitively from the diagram that the two path generation methods of linear filling and circular filling have obvious step effect during 3D printing. When the angle between the part boundary contour and the scanning direction is small, the step effect is more obvious. Seriously affects the forming accuracy of 3D printing; Figure 1C The method of offsetting the boundary contour is used for generation, so in principle, the generation of the step effect is avoided, but when the path is generated for workpieces (such as thin-walled parts) that require high edge accuracy, especially in 3D When the width of the single-pass cladding is equivalent to the minimum wall thickness, since the contour offset distance has exceeded 1 / 2 of the wall thickness of the thin-walled part, the corresponding scanning path cannot be generated at the narrow and long thin-walled structure (such as Figure 1D shown)

For such narrow, long and thin-walled structures with variable curvature, the scanning path can be generated by the first two filling methods, but the accuracy will decrease due to the step effect, and the obtained scanning path is relatively trivial and short. Laser 3D printing will cause the deterioration of the surface morphology, even if the layer outline is cut by manual blocks, it is still unavoidable

[0003] Therefore, for such workpieces with thin-walled structures, the existing 3D scanning path generation methods are difficult to effectively guarantee the printing accuracy, and it is becoming more and more important to develop a 3D printing scanning technology that can still effectively guarantee the printing accuracy when used for thin-walled workpieces. technical issues to be resolved

Images