【摘要】 对于液压缸缸筒内壁的激光熔覆再制造,在加工环境和扫描路径等方面与常规激光熔覆有着较大的区别。尤其是激光熔覆的工作环境位于缸筒内腔,在激光熔覆过程中一些没有被完全利用的粉末不能及时排出到工作环境之外,在缸筒内壁积累的粉末会直接影响到内壁熔覆效果。为此采用非均匀有理B样条(NURBS)曲线的路径规划。结果表明,在激光功率为1600 W、扫描速度为6 mm/s、送粉速率为12 g/min及NURBS曲线规划的路径下制备的熔覆层组织结构致密、无缺陷,证明NURBS曲线等弧长插补方法是一种可行的轨迹规划方法。更多还原

【Abstract】 The laser cladding remanufacturing of the inner wall of the hydraulic cylinder is quite different from the conventional laser cladding in the aspects of processing environment and scanning path. In particular, the working environment of laser cladding is located in the inner cavity of the cylinder, and some powders that have not been fully utilized cannot be discharged out of the working environment in time in the process of laser cladding, and the powder accumulated on the inner wall of the cylinder will directly affect the cladding effect of the inner wall. In view of this situation, the path planning of non-uniform rational B-spline(NURBS) curve will be adopted. The results show that the microstructure of the cladding layer prepared under the conditions of laser power 1600 W, scanning speed 6 mm stroke s and powder feeding rate 12 g/min is compact and defect-free. It is proved that the equal arc length interpolation method of NURBS curve is a feasible trajectory planning method.更多还原