中文摘要：

基于中空激光光内送粉技术，运用实时变姿态方法和法向分层方法，进行了具有不等高熔道特征的扇形结构件成形研究。分析了熔道层高与扫描速度之间的对应关系，结合不等高熔道的几何模型和熔道层高与扫描速度之间的关系，采用分段变速的方法熔覆出了不等高熔道。在此基础上进行多道不等高熔道堆积，成形出了扇形薄壁墙结构。分析表明，所获得成形件尺寸精度较高，相对尺寸误差控制在7%以内；成形件各处显微组织差异较小，组织细密、均匀。

英文摘要：

Based on hollow laser beam inside powder feeding technology, the study of forming fan-shaped part whose cladding height was unequal was carried out by the method of variable attitude forming and normal lamination method. The connection between cladding height and scanning velocity was analyzed. The cladding with unequal height was formed by the method of piecewise variable velocity combining geometric model and the connection above. Based on this method, the fan-shaped part was formed. The experimental result indicates that the formed part has high-precision dimension and good surface quality. In addition, the microstructures of the part at different parameter have no significant differences, and all achieve small grain size and compact texture.