A 3D printing scanning filling path planning method for thin-walled parts

Abstract

The invention discloses a 3D printing scanning filling path planning method for a thin-walled workpiece, and relates to the technical field of 3D printing. According to the method, a slice contour isdivided into a first filling area and a second filling area by judging whether a point vertical line segment on a central axis point sequence is larger than a preset point vertical line segment lengththreshold D2 or not, and then distinguishing filling is conducted. The method comprises the following steps of judging whether the point vertical line segment on the central axis point sequence is greater than a preset point vertical line segment length threshold D2 or not, and dividing the slice contour into the first filling area and the second filling area; filling the first filling area witha central axis path; and connecting point vertical line segments in the second filling area through line segments, forming a continuous filling path through arc curve transition, and then performing path filling. The method is suitable for manufacturing single-connected parts; compared with a parallel scanning path, the idle stroke is short, and the machining efficiency is improved; and compared with an offset scanning path, a cavity is prevented from appearing in the center of the contour, the idle stroke is small, and stable transition of the scanning speed is achieved by optimizing corners.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, in particular to a 3D printing scanning filling path planning method for thin-walled parts. Background technique [0002] In the additive manufacturing technology, the scanning and filling path planning of the 3D model layered slicing contour is one of the key technologies. At present, the reciprocating straight line method or the offset contour method are mostly used to generate the scanning and filling path; please refer to Figure 5 As shown in , the scanning line fills in a Z shape along the direction of the angle between the coordinate axis. When using the reciprocating straight line method to generate a filling path for complex polygons, it is difficult to form a continuous printing path, and the surface morphology at the corner is poor; please refer to Image 6 As shown, the offset contour filling along the direction perpendicular to the contour, when using the offset contour method to...

AI Technical Summary

Problems solved by technology

At present, the reciprocating straight line method or the offset contour method are mostly used to generate the scanning and filling path; please refer to Figure 5 As shown in , the scanning line fills in a Z shape along the direction of the angle between the coordinate axis. When using the reciprocating straight line method to generate a filling path for complex polygons, it is difficult to form a continuous printing path, and the surface morphology at the corner is poor; please refer to Image 6 As shown in , the offset contour filling along the direction perpendicular to the contour, when using the offset contour method to generate the filling path, because the polygon shape and filling width cannot guarantee to completely fill the entire contour area, it is easy to form a gap at the geometric center

[0003] The traditional arc fuse additive manufacturing technology usually uses the teaching method for path planning, which is suitable for products with simple structures and regular shapes; for variable cross-section components, it is very difficult to use the teaching method for path planning

Images