对于复杂轴类零件的激光熔覆再制造, 实现轨迹规划及自动编程较为困难。针对这种情况, 结合逆向工程与轴类零件再制造的特点, 完成了基于非均匀有理B样条(NURBS)曲线的复杂轴类零件表面逆向。提出了面向激光熔覆再制造的NURBS曲线等弧长插补方法并设计了一种基于Romberg求积公式的牛顿迭代数值算法。开发了6自由度关节机器人的轨迹规划及辅助编程程序。对实验零件熔覆层金相组织、厚度、显微硬度进行了测试和分析。结果表明, 熔覆层与基体形成冶金结合; 熔覆层厚度均匀, 在光束最大倾斜至水平夹角42°时, 熔覆层厚度比最厚处减少0.034 mm; 显微硬度明显高于基材。证明了这是一种可靠的激光熔覆再制造方法。

It is difficult to achieve trajectory planning and automatic programming for the remanufacturing of complex shaft shaped part. Aiming at this case, reverse measurement was completed based on non uniform rational B-spline(NURBS) curve for surface of part. A constant arc increment interpolation method was presented for laser cladding remanufacturing and the Newton iteration algorithm based on Romberg integral method was proposed and designed. A program based on 6 DOF robot was developed for trajectory planning and computer aided programming. The morphology, microstructure, thickness and micro-hardness of layer were tested and analyzed. It is observed that, the cladding layer and substrate have a good metallurgical bond, layer thickness is uniform, when the max laser beam tilt angle from the horizontal is 42°, cladding thickness decreases 0.034 mm compared with maximum thickness, the micro-hardness is significantly higher than the substrate. Experimental results show the effectiveness of the method proposed.