摘要
建立了一套基于纳秒激光的加工系统,进行航空发动机火焰筒的气膜孔加工。介绍了圆形通孔和异形孔的加工方法,并在平板上开展了加工实验。研究了喷嘴至工件距离、焦点位置对加工质量的影响,以及激光脉冲宽度、脉冲能量、重复频率、激光功率对加工质量与效率的影响。使用1064 nm纳秒激光器在精密五轴机床上加工气膜孔。对于圆形通孔,采用正面加工和背部扩口两步工序,其中背部扩口需在机床摇篮角度补偿的配合下进行。异形孔加工则在此基础上增加了异形孔的加工及去除内部熔渣的两步工序。在异形孔加工过程中,机床需要在异形孔方向左右摆动,以确保孔形更为理想。实验结果表明,加工后的气膜孔内壁光滑,孔边缘仅有微量重铸层,表面横向宽度和轴向孔径的平均误差分别为30.1μm和15.7μm,均优于工业标准。
A nanosecond laser processing system was established for film cooling holes in aircraft engine flame tubes.Machining methods for circular and special-shaped holes were introduced,and experiments were conducted on stainless steel flat plates.The study analyzed the effects of nozzle-to-plate distance,focal position,laser pulse width,pulse energy,repetition frequency,and laser power on hole quality and machining efficiency.A 1064 nm nanosecond laser processed film cooling holes using a precision five-axis machine.Circular holes were machined in two steps:front machining followed by back chamfering,with back chamfering requiring compensation for the machine tool cradle angle.Special-shaped hole machining included two additional steps:shaping the hole and removing internal slag.The machine tool oscillated laterally during special-shaped hole machining to ensure an ideal hole profile.Experimental results showed smooth inner walls of film cooling holes,with minimal recast layers at the edges.Errors in surface lateral width and axial diameter were maintained within a small range,averaging 30.1μm and 15.7μm,respectively,which were better than standard values.
作者
畅仕超
杨继超
孙超伟
陈龙
胡安博
贾天卿
CHANG Shichao;YANG Jichao;SUN Chaowei;CHEN Long;HU Anbo;JIA Tianqing(College of Information Engineering,Henan University of Science and Technology,Luoyang 471023,Henan China;Institute of Laser Manufacturing,Henan Academy of Sciences,Zhengzhou 450046,China)
出处
《河南科学》
2025年第2期185-192,共8页
Henan Science
基金
国家自然科学基金面上项目(12074123)
河南省科学院人才启动项目(241823009)。
关键词
航空发动机
气膜孔
纳秒激光
五轴精密机床
aircraft engine
film cooling holes
nanosecond laser
five-axis precision machine
