红外与激光工程, 2019, 48 (8): 0805002, 网络出版: 2019-09-03  

激光内送粉变宽扫描成形变壁厚扭曲叶片

Variable width scanning of variable wall thickness twisted blade with laser inside-beam powder feeding
作者单位
1 苏州大学 光电科学与工程学院, 江苏 苏州 215021
2 苏州大学 机电工程学院, 江苏 苏州 215021
摘要
传统激光熔覆增材制造方法一般采用等线宽扫描, 难以实现单道连续变宽成形。设计了变壁厚扭曲叶片模型, 利用光内送粉喷头直接变焦法变化光斑直径, 采用层高控制系统测量不同宽度处的实际堆积高度。设计PI控制器, 通过变化扫描速度, 控制不同宽度处的熔道堆积层高一致, 保证成形精度。通过连续变焦与闭环控制算法, 实现了变壁厚扭曲叶片激光熔覆连续变宽扫描成形。结果表明: 扭曲叶片在壁厚2.52~6.18 mm范围内均匀变化, 最大壁厚误差为-0.58 mm; 各段高度大致相同, 最大高度误差为-0.22 mm; 不同壁厚处的显微组织较为致密均匀。
Abstract
The conventional laser cladding forming process generally uses equal line-width scanning, which can difficultly realize a continuously variable width deposition. A blade model with variable wall thickness was designed. The inside-beam powder feeding nozzle was applied for the variable laser spot deposition. A deposition height control system was used to measure the actual height of each segment. PI-controllers with scanning speed as the control input were designed to guarantee equal deposition heights in different widths. A segmented deposition height control strategy was developed to realize continuous variable width deposition of the variable wall thickness twisted blade. The structure was formed based on methods of continuously varying focus distance and closed-loop control. The test results indicate that the wall thickness varied uniformly from 2.52 mm to 6.18 mm, and the largest error was -0.58 mm. The heights of the segments were in accordance with the largest error of -0.22 mm. The micro-structure in different wall thickness positions were compact and uniform.

石拓, 沈婷, 李东升, 傅戈雁. 激光内送粉变宽扫描成形变壁厚扭曲叶片[J]. 红外与激光工程, 2019, 48(8): 0805002. Shi Tuo, Shen Ting, Li Dongsheng, Fu Geyan. Variable width scanning of variable wall thickness twisted blade with laser inside-beam powder feeding[J]. Infrared and Laser Engineering, 2019, 48(8): 0805002.

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