超高速激光熔覆头非稳态追踪粉末流场研究
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国家自然科学基金资助项目(No.61775067)资助。


Simulation of ultra-high speed laser claddinghead powder flow by unsteady tracking
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    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(Cr6+)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0.8mm的粉斑,熔覆头下方15~19mm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。

    Abstract:

    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 0.8mm can be formed by ultra-high speed laser cladding ring cladding head,and the powder concentration is the highest in the space of 15~19mm below the cladding head.The feasibility of the model is verified by experimental comparison.

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杨卫红,张雪,孔敏,罗惜照.超高速激光熔覆头非稳态追踪粉末流场研究[J].激光与红外,2021,51(7):859~864
YANG Wei-hong, ZHANG Xue, KONG Min, LUO Xi-zhao. Simulation of ultra-high speed laser claddinghead powder flow by unsteady tracking[J]. LASER & INFRARED,2021,51(7):859~864

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  • 在线发布日期: 2021-07-22