激光熔覆同轴送粉喷嘴研制  

Research on the Coaxial Powder Feeding Nozzle for Laser Cladding

作　　者：王维[1] 才磊[1] 杨光[1] 钦兰云[1] 卞宏友[1] 王刚[1] 齐鹏[1] 魏强[1] 佟明[2] 

机构地区：[1]沈阳航空航天大学航空制造工艺数字化国防重点学科实验室,辽宁沈阳110136 [2]天津汽车模具股份有限公司,天津300308

出　　处：《中国激光》2012年第4期67-73,共7页Chinese Journal of Lasers

基　　金：国防基础科研项目(A3520061304);辽宁省科技厅国际合作项目(2007405005)资助课题

摘　　要：针对现有送粉喷嘴粉末汇聚性差、出粉口容易堵塞以及受热变形的缺点,设计了一种四孔式同轴送粉喷嘴。喷嘴中央为激光束及保护气通道,沿中心锥孔轴向均布的4个小孔,为粉末通道。建立了数值计算模型,应用FLUENT软件对粉末通道不同出口形状和不同倾角条件下粉末流场情况进行数值模拟,选择最优方案。计算结果表明,在其他工艺参数一定的前提下,采用收缩出口与粉末通道倾角为70°时有利于改善熔覆成形效果。最后利用研制的送粉喷嘴进行粉末汇聚、激光熔覆成形等实验,验证该送粉喷嘴的实验效果。Aiming at the disadvantages of existing powder feeding nozzle,which include powder convergent inferior,powder outlet is easy to block and thermal deformation,designed a four hole coaxial powder feeding nozzle.The center of nozzle is laser beam as well as shielding gas channel and the four holes which along the center bore axially uniform distribution is powder channel.Numerical calculation model is established by using FLUENT software on the powder flow numerical simulation under the condition of the powder feeding channel outlet in different shape and different dip angle,and the optimal scheme is selected.The results show that the contraction of export and the powder channel angle of 70° is beneficial to improve the cladding forming effect with other process parameters invariable.Finally,with the developed powder feeding nozzle for powder together,laser cladding forming test and so on,validates the experimental effect of powder feeding nozzle.

关 键 词：激光技术 激光熔覆成形 数值模拟 送粉喷嘴 粉末通道 

分 类 号：TN249[电子电信—物理电子学]