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针对薄壁叶片不等宽的结构特征,提出基于光内送粉方式采用变光斑一次扫描而非多道搭接直接成形出不等宽熔覆层的方法,逐层堆积直接制造薄壁叶片。研究了变斑过程中等高度单道及“阶梯型”单道对薄壁件成形质量的影响规律。实验结果表明:在保证送粉量足够的条件下,变光斑过程中通过实时变扫描速度及激光功率,能够直接熔覆出高度相等、宽度逐渐变化的单道熔覆层;基于等高度单道的变斑堆积过程中熔覆层增长高度并不一致,宽高比大的部位生长高度要大于宽高比小的部位的问题,建立了熔覆层提升量、单层生长高度和熔覆层截面曲线阶数的理论模型,提出了“阶梯型”单道变斑直接成形方法,解决了熔覆层高度生长不一致的问题,获得了熔覆层宽度从1 mm到3 mm连续变化的薄壁叶片,为光内送粉激光直接成形薄壁变壁厚类零件提供新方法。
Aiming at the structural characteristics of thin-walled blades with unequal width, a method based on the light-powder feeding method is proposed, which uses the spot-changing spot instead of multiple laps to directly form the unequal-width cladding layer. The influence of the single height and the “single-path” single-pass on the forming quality of the thin-walled parts during the speckle reduction was studied. The experimental results show that under the condition of sufficient feeding of powder, the single pass cladding layer with the same height and width can be directly cladded by changing the scanning speed and the laser power in the process of spot changing. , The growth height of the cladding layer is larger than the one with the larger aspect ratio than that with the smaller aspect ratio, and the amount of cladding layer lift, the growth height of the single layer and the cross-section of the cladding layer The theoretical model of the curve order is proposed, and the “step-type” single-spot direct forming method is proposed to solve the problem of inconsistent height growth of the cladding layer. A thin layer with a continuously varying cladding width ranging from 1 mm to 3 mm is obtained Wall blades provide a new method for direct forming thin-walled variable wall thickness parts for powder-fed laser in light.