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Laser additive manufacturing process path planning method based on thin-wall feature recognition

A technology of laser additive and manufacturing process, which is applied in the field of metal additive manufacturing, can solve problems such as single and difficult to guarantee the final forming quality of parts, and achieve the effect of ensuring forming quality and avoiding heat accumulation

Active Publication Date: 2019-11-29
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Limited by the serious packaging of commercial software and commercial equipment, most of the current experimental research is based on a single thin-walled model for analysis and processing. For models with complex shapes, a single, simple scanning path and process parameters are difficult to guarantee the accuracy of parts. The final forming quality, so by identifying and dividing thin-walled areas, optimizing local processing parameters is an effective way to ensure the forming quality of parts

Method used

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  • Laser additive manufacturing process path planning method based on thin-wall feature recognition
  • Laser additive manufacturing process path planning method based on thin-wall feature recognition
  • Laser additive manufacturing process path planning method based on thin-wall feature recognition

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Embodiment Construction

[0021] combine Figure 1 to Figure 3 , a laser additive manufacturing process path planning method based on thin-walled feature recognition, including the following steps:

[0022] Step 1, input the 3D model of the part and perform slice processing to obtain all slice data. Such as image 3 The size of the bounding box of the model shown is 18mm*18mm, the thickness of the four thin walls is 1.41mm, and the set thin-wall judgment width W is 2mm.

[0023] Step 2: Constrained Delaunay triangulation of polygons is performed on the slice contours of each layer.

[0024] Step 3, for the constrained Delaunay triangle containing the slice silhouette edge, calculate the height h of the triangle with the silhouette edge as the base, if h is less than W, the silhouette edge is marked as a thin-walled edge and marked; as figure 1 The heights of the 8 triangles obtained by subdividing the four thin-walls shown are all 1.41mm based on the contour edges, and the contour edges in the trian...

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Abstract

The invention provides a laser additive manufacturing process path planning method based on thin-wall feature recognition. The method comprises the following steps of: distinguishing a thin-wall region in the boundary of a single-layer section outline of a part model, and respectively planning a scanning path for the thin-wall region and a non-thin-wall region. The thin-wall region is a triangularregion, wherein the height of a triangle where the contour edge is located after polygonal constrained Delaunay triangulation is carried out on a single-layer section contour is smaller than a threshold value.

Description

technical field [0001] The invention relates to a metal additive manufacturing technology, in particular to a laser additive manufacturing process path planning method based on thin-wall feature recognition. Background technique [0002] In recent years, laser selective melting technology has received widespread attention and rapid development, showing broad application prospects and technical advantages in aviation, aerospace, mold, medical and other fields. It uses special software to slice and layer the three-dimensional model of the part, and after obtaining the profile data of each section, the high-energy laser beam is used to selectively melt the metal powder layer by layer according to the profile data. way to manufacture three-dimensional solid parts. [0003] Laser selective melting technology can theoretically form parts with arbitrary complex structures, but it is still limited by some geometric features in actual processing, the most typical of which is thin-wa...

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Application Information

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IPC IPC(8): B22F3/105B33Y50/02
CPCB33Y50/02B22F10/10B22F10/00B22F10/36B22F10/366B22F10/20Y02P10/25
Inventor 张长东管志方王聪刘婷婷廖文和
Owner NANJING UNIV OF SCI & TECH
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