摘要
超高速激光熔覆过程中,粉末对激光能量的衰减是研究激光熔覆粉末流温度场的关键问题之一,同时也是实现高超速激光熔覆激光能量合理分配的依据。以同轴四路送粉管激光熔覆头和超高速激光熔覆环形熔覆头为研究对象,利用非稳态粒子追踪模式,设计一种计算粉末对激光产生能量衰减的算法,根据算法计算结果分析两种熔覆头在不同工艺参数下产生能量衰减的情况,并结合试验验证激光与粉末相互作用过程中的激光能量衰减现象。仿真与试验结果均发现激光能量的衰减主要发生在熔覆头下方的高粉末浓度区域且衰减曲线具有高斯函数的特征;同轴四路送粉管熔覆头的光衰减试验验证了仿真模型的可靠性,同时验证了激光穿越粉末的衰减曲线具有高斯函数的特征且存在一个最佳送粉量。
In the process of ultra-high speed laser cladding, the attenuation of laser energy by powder is one of the key problems to study the temperature field of laser cladding powder flow, and it is also the basis to realize the reasonable distribution of laser energy in ultra-high speed laser cladding. In this paper, the coaxial four way powder feeding tube laser cladding head and ultra-high speed laser cladding ring cladding head are taken as the research objects. Using the unsteady particle tracking mode, an algorithm is designed to calculate the energy attenuation of the powder to the laser. According to the calculation results of the algorithm, the energy attenuation of the two cladding heads under different process parameters is analyzed. The phenomenon of laser energy attenuation in the process of laser powder interaction is verified by experiments. Results of simulation and experiment show that the laser energy attenuation mainly occurs in the high powder concentration region under the cladding head, and the attenuation curve has the character of Gauss function. The reliability of the simulation model is verified by the light attenuation experiment of the cladding head of coaxial four-way powder feeding tube. It is also verified that the attenuation curve of laser through powder has the character of Gauss function, and there is an optimal powder feeding quantity.
作者
杨卫红
张雪
孔敏
罗惜照
Yang Weihong;Zhang Xue;Kong Min;Luo Xizhao(Wuchang University of Technology Artificial Intelligence School,Wuhan,Hubei 430074 China;Wenhua College,Department of Intelligent Manufacturing,Wuhan,Hubei 430074 China;Huazhong University Science and Technology,School of Optics and Electronic Information,Wuhan,Hubei 430074 China)
出处
《应用激光》
CSCD
北大核心
2022年第8期14-20,共7页
Applied Laser
基金
国家科技重大专项项目(2010ZX03007-002-03)。
关键词
超高速激光熔覆
非稳态追踪
能量衰减
流场
ultra high speed laser cladding
unsteady tracking
energy attenuation
flow field
