多层单道电弧增材表面3-D重构方法研究

为了研究多层单道电弧增材表面3-D成形特征,采用激光视觉传感系统采集电弧增材制造表面条纹图像。提出基于边界约束条件的感兴趣区域(ROI)提取法对焊缝特征曲线进行定位,获取ROI的激光条纹像素坐标。进行了理论分析和实验验证,得到电弧增材表面的3-D离散点数据,采用Delaunay三角剖分对离散点拟合形成3-D实体表面。结果表明,锯齿靶标的线性标定方法,3-D重构精度在0.2mm以内;基于边界约束条件的ROI提取方法能准确定位电弧增材上表面和侧表面的条纹特征曲线。这一结果对电弧增材表面的3-D成形检测是有帮助的。

Research on 3-D reconstruction method of multi-layer single-pass arc additive manufacture surface

In order to investigate the 3-D forming characteristics of multi-layer single-pass arc additive manufacture surface, the laser vision sensing system was built to collect the surface stripe images of arc additive manufacture. An region of interest (ROI) extraction method based on boundary constraints was proposed to locate the weld characteristic curve, getting the laser stripe pixel coordinates of ROI. Through theoretical analysis and experimental verification, the 3-D discrete points set of the arc additive surface were obtained, and the discrete points were fitted to form a 3-D solid surface by Delaunay triangulation algorithm. The results show that 3-D reconstruction accuracy is within 0.2mm by linear calibration method of sawtooth, and the ROI extraction method based on boundary constraints can accurately locate the stripe characteristic curve of the top surface and side surface of the arc additive manufacture. The 3-D reconstruction of the arc additive manufacture surface can visually describe the formation of the weld, which provides a new test method for surface forming inspection of arc additive manufacturing. It is beneficial for 3-D forming detection of arc additive manufacture surface.