激光熔覆成形薄壁件离焦量和Z轴提升量选择方法  

Method to select defocused amount and Z-increments in forming thin-walled part with laser cladding

作　　者：徐海岩[1] 李涛[1] 李海波[1] 王鑫林 张洪潮[1] 

机构地区：[1]大连理工大学机械工程学院,辽宁大连116024

出　　处：《大连理工大学学报》2017年第6期557-563,共7页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(51775086)

摘　　要：离焦量和Z轴提升量影响激光熔覆成形薄壁件的精度和效率,得到高精度薄壁件的关键是使Z轴提升量等于初始离焦量下的熔覆高度.为了解决高精度、高效率激光熔覆成形薄壁件问题,基于概率学构建了同轴送粉式激光熔覆系统的粉末分布密度模型,得到了不同负离焦量下熔覆高度计算公式并进行实验验证.提出了任意负离焦量和Z轴提升量下多层熔覆成形薄壁件高度的计算方法并进行实验验证.结果表明多层熔覆成形薄壁件高度的计算结果与实验结果基本一致,选择尽可能大并且能够形成自愈合作用的负离焦量,并使Z轴提升量等于该离焦量对应的熔覆高度计算值,可以得到成形效率高、精度高的薄壁件.Defocused amount and Z-increments affect the accuracy and efficiency of thin-walled part with laser cladding forming.The key to obtain high-accuracy thin-walled part is to make the Zincrements equal the cladding height under initial defocused amount.In order to solve the problem of forming thin-walled part with high accuracy and efficiency,powder density distribution model of laser cladding system with coaxial-powder feeding is established based on the probability theory,the calculation formula of cladding height under different negative defocused amounts is given and experimentally verified.The calculation method of multi-layer cladding forming thin-walled part height under any negative defocused amount and Z-increment is proposed and experimentally verified.The results show that calculations of multi-layer cladding forming thin-walled part height are in accordance with experiments.Selecting self-regulation-effect negative defocused amount as large as possible,and making Z-increments equal the calculated value of cladding height under this defocused amount,the thin-walled parts with high forming efficiency and high accuracy can be obtained.

关 键 词：激光技术 薄壁件成形 离焦量 Z轴提升量 

分 类 号：TG39[金属学及工艺—金属压力加工]