超高速激光熔覆头非稳态追踪粉末流场研究  

Simulation of ultra-high speed laser cladding head powder flow by unsteady tracking

作　　者：杨卫红 张雪[1] 孔敏 罗惜照 YANG Wei-hong;ZHANG Xue;KONG Min;LUO Xi-zhao(Artificial Intelligence School,Wuchang University of Technology,Wuhan 430074,China;Department of Intelligent Manufacturing,Wenhua College,Wuhan 430074,China;School of Optics and Electronic Information,Huazhong University Science and Technology,Wuhan 430074,China)

机构地区：[1]武昌理工学院AI学院电子与信系工程,湖北武汉430074 [2]文华学院机械与电气工程学院智能制造系,湖北武汉430074 [3]华中科技大学光学与电子信息学院,湖北武汉430074

出　　处：《激光与红外》2021年第7期859-864,共6页Laser & Infrared

基　　金：国家自然科学基金资助项目(No.61775067)资助。

摘　　要：超高速激光熔覆技术取代电镀铬,可解决电镀铬工艺重金属铬离子(Cr^(6+))重金属污染,被禁止或限制的工业应用问题。金属工件表面镀硬铬,集耐蚀性防护、装饰于一体,有着巨大的应用前景。我国超高速激光熔覆技术的研发,主要侧重点在于设备集成与工艺实验研究,缺少熔覆过程仿真模型。本文以超高速激光熔覆环形熔覆头为研究对象,利用FLUENT建立了基于非稳态粒子追踪技术的CFD仿真模型,开发了一种针对环形熔覆头激光熔覆粉末流场模型。针对超高速激光熔覆工艺进行了实验与分析;建立了该过程的理论模型。通过仿真结果发现超高速激光熔覆环形熔覆头可以形成半径0.8 mm的粉斑,熔覆头下方15~19 mm空间内粉末浓度最高,并通过实验对比验证了模型的可行性。Ultra-high-speed laser cladding technology replaces chromium plating,which can solve the industrial application problem of heavy metal pollution caused by chromium ion(Cr^(6+))in chromium plating process.Hard chromium plating on the surface of metal workpiece is a combination of corrosion resistance protection and decoration,which has a great application prospect.The research and development of ultra-high speed laser cladding technology in China mainly focuses on equipment integration and process experiment research,but lacks the simulation model of cladding process.In this paper,the ultra-high speed laser cladding ring cladding head is taken as the research object,and a CFD simulation model based on unsteady particle tracking technology is established by using FLUENT,and a flow field model of laser cladding powder for ring cladding head is developed.The ultra-high speed laser cladding process is tested and analyzed.The theoretical model of the process is established.Through simulation results,it is found that powder spots with a radius of 0.8 mm can be formed by ultra-high speed laser cladding ring cladding head,and the powder concentration is the highest in the space of 15~19 mm below the cladding head.The feasibility of the model is verified by experimental comparison.

关 键 词：超高速激光熔覆 非稳态追踪 CFD仿真 流场 

分 类 号：TG456.7[金属学及工艺—焊接] TN249[电子电信—物理电子学]