桥接封盖结构激光熔覆成形研究

Research on Laser Cladding Forming of Bridge Cover Structure

目前激光熔覆成形技术一般难以实现无支撑封盖结构成形。利用光内送粉技术和斜向分层方法,对跨多道直壁的搭接封盖成形进行了研究,实现了空间斜向桥接堆积成形。探讨了光内送粉熔覆喷头在不同倾斜角度投影下环形激光能量分布规律,考察了激光偏转角对熔覆层貌的影响。引入层高测控技术对熔覆层高度进行实时检测并反馈控制,保证堆积形貌不失稳。对桥接封盖成形结构组织检测结果表明:空间封盖搭接处表面平整,壁厚均匀,硬度总体保持稳定。

At present, laser cladding forming techniques are generally difficult to realize the formation of an unsupported capping structure. Using the intra-powder powder feeding technology and the oblique stratification method, the lap joint cap forming across multiple straight walls was studied, and the spatial oblique bridging stacking was realized. The distribution of annular laser energy under different oblique angle projections of light-fed powder-fed nozzles was discussed. The influence of tilt deflection angle on the appearance of cladding was investigated. The layer height measurement and control technology is introduced to detect and control the height of the cladding layer in real time to ensure that the stacking morphology is not unstable. The results of the structure inspection of the bridging cap forming structure show that the surface of the space cover overlap is flat, the wall thickness is uniform, and the hardness is generally stable.