The principle of the medial axis calculation is complicated and difficult to implement. Moreover, the accuracy is not high. Then, as the generated path has an endpoint at the boundary of the polygon, burrs may appear on the surface of the molded piece. This paper aims to improve the warpage deformation of SLM molded parts and the surface quality of molded parts, an improved mid-axis path generation algorithm is proposed.,First, the center point is calculated by the seed point growth method based on the distance transform, and the obtained medial axis has high precision and is suitable for simple polygons and complex polygons. Then, based on the extracted medial axis, a preliminary path is generated, the path is trimmed with MATLAB to remove the redundant path. Finally, a scan along the contour of the polygon is performed to improve the surface quality of the molded part.,The algorithm reduces the internal stress generated during the molding process by continuously changing the scanning direction of the path along the boundary curve of the scanning area, thereby reducing the amount of warpage of the molded part. The result of extraction has a higher precision and wider scope of application than other methods to extract central axis, such as the Voronoi diagram-based method. The path is trimmed to remove redundant paths and the polygon boundaries are scanned to further improve the surface quality of the molded part. The results show that warpage deformation of the proposed algorithm is significantly smaller than the other two methods, thus the forming precision is higher.,An improved medial axis path generation algorithm is proposed in this paper. The proposed method is applied to improve warpage deformation occurring in the SLM process. Seed point growth of distance transformation is used to extracted central axis. The result of extraction has a higher precision and wider scope of application than other methods to extract central axis, such as the Voronoi diagram-based method.

中文翻译：

---

一种改进的选择性激光熔化中轴路径生成算法

中轴计算原理复杂，难以实现。而且，准确率不高。然后，由于生成的路径在多边形的边界处具有端点，因此模制件的表面上可能会出现毛刺。本文旨在改善SLM成型件的翘曲变形和成型件的表面质量，提出一种改进的中轴路径生成算法。首先，通过基于距离变换的种子点生长法计算中心点，得到的中轴精度高，适用于简单多边形和复杂多边形。然后，基于提取的中轴，生成初步路径，用MATLAB修剪路径以去除冗余路径。最后，沿着多边形的轮廓进行扫描，以提高成型件的表面质量。该算法通过沿着扫描区域的边界曲线不断改变路径的扫描方向来降低成型过程中产生的内应力，从而减少成型件的翘曲量。与基于Voronoi图的其他方法提取中心轴相比，提取结果具有更高的精度和更广泛的适用范围。修剪路径以去除多余的路径，并扫描多边形边界以进一步提高成型零件的表面质量。结果表明，该算法的翘曲变形明显小于其他两种方法，成型精度更高。本文提出了一种改进的中轴路径生成算法。所提出的方法用于改善SLM工艺中发生的翘曲变形。距离变换的种子点生长用于提取中心轴。与基于Voronoi图的其他方法提取中心轴相比，提取结果具有更高的精度和更广泛的适用范围。