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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。
Laser cladding remanufacturing of complicated shaft parts is difficult to realize trajectory planning and automatic programming. In view of this situation, combined with the reverse engineering and remanufacturing features of shaft parts, the surface inversion of complex shaft parts based on NURBS curve is completed. An arc length interpolation method such as NURBS curve for laser cladding remanufacturing is proposed and a Newton iterative numerical algorithm based on Romberg quadrature formula is designed. Developed 6 DOF joint robot trajectory planning and auxiliary programming. The microstructure, thickness and microhardness of the cladding were tested and analyzed. The results show that the cladding layer forms a metallurgical bond with the substrate, and the cladding layer has a uniform thickness. When the beam angle is maximally inclined to 42 °, the cladding layer thickness is reduced by 0.034 mm, and the microhardness is obviously higher than that of the substrate . This proves that this is a reliable laser cladding remanufacturing method.