倾斜基体上激光熔覆临界搭接率及平整度研究  

Research of Critical Overlap Rate and Flatness of Laser Cladding on Inclined Substrates

作　　者：曹铭 李涛[1] 石博文[1] 詹欢 张筱睿 夏祯航 Cao Ming;Li Tao;Shi Bowen;ZZhan Huan;Zhang Xiaorui;Xia Zhenhang(School of Mechanical Engineering,Dalian University of Technology,Dalian 11608l,Liaoning,China)

机构地区：[1]大连理工大学机械工程学院,辽宁大连116081

出　　处：《应用激光》2023年第3期26-32,共7页Applied Laser

基　　金：国家自然科学基金(5197052248)。

摘　　要：多道激光熔覆层的表面平整度和搭接率的大小密切相关。为研究搭接率对倾斜基体激光熔覆层表面平整度的影响规律并获得平整表面的临界搭接率,用椭圆模型拟合倾斜基体熔覆层的横截面,并通过试验验证椭圆模型拟合的可行性。建立了倾斜基体的搭接模型,得出倾斜基体上获得最佳平整度的临界搭接率的计算方法,在基体30°倾角下研究不同搭接率对熔覆层平整度的影响。结果表明,较小的搭接率会导致熔覆层的平整度降低,较大的搭接率会使熔覆层不断堆积导致熔覆层高度增加,在临界搭接率下,可以在几乎不改变熔覆层高度的情况下获得平整的熔覆层。The size of the overlap rate affects the surface flatness of the multi-overlap laser cladding layer.In order to study the effect of overlap rate on the surface flatness of laser cladding on inclined substrates and obtain the critical overlap rate for flat surfaces,an elliptical model was used to fit the cross-section of the tilted substrate cladding layer,which was verified by experiments.The overlap model of the inclined substrate was established,and the calculation method of the critical lap rate to obtain the best flatness on the inclined substrate was derived.The effect of different overlap rates on the flatness of the clad layer is investigated at a substrate inclination of 30°.Results show that a smaller overlap rate leads to a decrease in the flatness of the clad layer and a larger overlap rate leads to an increase in the height of the clad layer due to the continuous accumulation of the clad layer,and that a flat clad layer can be obtained with almost no change in the height of the clad layer at the critical overlap rate.

关 键 词：激光熔覆 搭接率 倾斜基体 几何数学模型 

分 类 号：TG17[金属学及工艺—金属表面处理]