微孔的磨料水射流抛光CFD模拟及试验  

CFD simulation and experiments of abrasive water jet polishing for micropores

作　　者：崔子含 韩冰[1] 吴鹏程 李擎 马小刚[1] 丁云龙 CUI Zihan;HAN Bing;WU Pengcheng;LI Qing;MA Xiaogang;DING Yunlong(School of Mechanical Engineering&Automation,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;Dalian Company,Genertec Machine Tool Engineering Research Institute Co.,Ltd.,Dalian 116620,Liaoning,China;Aero Engine Corporation of China Dong'an Engine Company Limited,Harbin 150066,China)

机构地区：[1]辽宁科技大学机械工程与自动化学院,辽宁鞍山114051 [2]通用技术集团机床工程研究院有限公司大连分公司,辽宁大连116620 [3]中国航发哈尔滨东安发动机有限公司,哈尔滨150066

出　　处：《金刚石与磨料磨具工程》2024年第4期534-543,共10页Diamond & Abrasives Engineering

基　　金：辽宁省省科技厅重点研发计划(2023JH2/101300226);辽宁科技大学省级重点实验室开放课题基金(2023KFKT-07,2022100305)。

摘　　要：为解决飞秒激光微孔难以抛光的问题,结合磨料水射流去除函数稳定、自适应性强等特点,采用磨料水射流抛光方法提高飞秒激光微孔质量。利用Fluent软件对不同工艺参数下的磨料水射流微孔抛光过程进行计算流体力学(computational fluid dynamics,CFD)模拟,分析不同参数下的流场分布、侵蚀速率及壁面剪切力作用规律;然后通过响应面法对射流靶距、射流压力及磨料粒径等3因素进行优化试验,以微孔内壁面剪切力均方差为响应值,建立其响应面方程,获得最佳抛光参数组合并进行试验验证。结果表明:射流压力对微孔内壁面剪切力的影响最大,当射流压力从0.80 MPa增至1.50 MPa时,微孔内壁面剪切力增大2倍以上。射流的不同结构段因性质不同可适用于不同工况。利用响应面法分析得到水射流微孔抛光的最佳工艺参数组合是:射流冲击角,90°;射流靶距,3.5 mm;射流压力,1.10 MPa;磨料粒径,15.0μm。在该条件下抛光微孔内壁面的表面粗糙度R_a降至0.354μm。磨料水射流抛光可显著改善微孔壁面质量,且响应面法预测的数据模型有较高准确性。Objectives:Femtosecond laser technology has become the primary method for micropore processing due to its high precision and low energy consumption.However,during the process,it is easy to cause microcracks and burrs in the micropores.Additionally,due to the small size,low structural stability and weak wear resistance of the micropores,conventional methods are ineffective in polishing them.To address the challenge of polishing femtosecond laser-pro-cessed micropores,the abrasive water jet polishing method is employed.This method leverages the stable removal func-tion and strong adaptability of the abrasive water jet to improve the quality of femtosecond laser-processed micropores.Methods:Computational fluid dynamics(CFD)simulations of the abrasive water jet micropore polishing process under different process parameters were carried out by using Fluent software.A finite element model of abrasive water jet pol-ishing for femtosecond laser-processed micropores was established under various working conditions.The flow field distribution,the erosion rate and the wall shear force under different parameters were analyzed.Corresponding experi-ments were conducted for each variable discussed in the Fluent simulation,and the variation patterns of micropore inner wall roughness were summarized.Subsequently,optimization experiments were conducted on the three factors,namely jet target distance,jet pressure and abrasive particle size,using the response surface method.The mean square error of shear force on the inner wall of the hole was taken as the response value Y,and the response surface equation was estab-lished.The optimal polishing parameter combination was obtained through the response surface equation and experi-mentally verified.Results:A jet impact angle of 90°is suitable for polishing the inner wall of the micropore,as wall erosion is uniform and the shear force distribution is concentrated at this angle.At a target distance of 4.2 to 6.0 mm,the jet on the end face enters the deceleration stage,and the jet velocit

关 键 词：磨料水射流 飞秒激光微孔 计算流体力学 壁面剪切力 响应面法 

分 类 号：TG58[金属学及工艺—金属切削加工及机床] TG73TG664