摘要
航天发动机供油装置的喷油流量均匀性是决定其性能质量的关键技术指标,其中供油孔的形状尺寸、内表面状态是喷油流量的重要影响因素。传统的供油孔加工方法以电火花加工为主,存在较厚的重铸层,且加工效率低。而激光制孔为典型的非接触式制孔方法,具有加工效率高、质量好,重铸层少的显著优势。为满足某型号航天发动机供油装置的高效高质量制造要求,采用脉宽为200 fs的超短脉冲飞秒激光螺旋制孔工艺,针对1.5 mm厚的GH3044镍基合金材料开展了以0.39 mm孔径为加工基准的流量数值模拟及工艺试验研究。首先通过数值模拟手段,研究了孔径、圆度、锥度以及内壁粗糙度对供油孔流量的影响规律和控制手段,之后根据模拟所获得的理论结果,通过飞秒激光制孔试验对制孔工艺进行了优化。研究发现,出入口孔径是决定流量大小最重要的因素,在单脉冲能量140μJ,单层扫描时间1200 ms,单层进给量0.02 mm,重复频率100 kHz,旋转速度2400 r/min的工艺下,将孔径偏差控制在±5μm以内,最终成功实现了供油孔流量偏差1.8%的制孔效果。
Objective The uniformity of oil injection flow of the aerospace engine oil supply device is a key technical index to determine its performance quality,in which the shape and size of the injection hole and the state of the internal surface are important influencing factors of the oil injection flow.The traditional oil injection hole processing method is based on EDM,there is a thick recast layer,and the processing efficiency is low.The laser hole is made with a typical non-contact hole making method,which has significant advantages of high processing efficiency,good quality and less recast layer.In order to meet the high-efficiency and high-quality manufacturing requirements of a certain type of aerospace engine fuel supply device,the ultra-short pulse femtosecond laser screw hole making process with a pulse width of 200 fs was adopted,and the flow numerical simulation and process test study with 0.39 mm hole diameter as the processing benchmark were carried out for the 1.5 mm thick GH3044 nickel-based alloy material.Methods By means of numerical simulation,the effect of hole diameter(Fig.6),taper(Fig.8),roundness(Fig.9),internal wall roughness(Tab.2)and hole depth(Fig.10)on the flow rate of oil supply hole is studied.The effect of single pulse energy(Fig.13),single layer scan time(Fig.14)and single layer feed(Fig.15)on the hole diameter is analyzed,and the hole diameter deviation is controlled by process optimization to ensure the flow stability.Results and Discussions Numerical simulations were used to investigate the factors influencing the hole flow rate.The results show that the hole diameter is the main factor affecting the hole flow rate,and the flow rate is linearly related to the square of the hole diameter(Fig.6).The internal wall roughness has an inhibitory effect on the flow rate of holes.For a 0.39 mm diameter micro-hole,the flow rate is reduced by 3.3%when the roughness is 0.01 mm and by 5.96%when the roughness is 0.05 mm(Tab.2).The roundness(Fig.9)and height(Fig.10)of the micro-hole had no significa
作者
张子浩
王旭
黄怡晨
李福泉
李俐群
蔺晓超
杨诗瑞
郭鹏
Zhang Zihao;Wang Xu;Huang Yichen;Li Fuquan;Li Liqun;Lin Xiaochao;Yang Shirui;Guo Peng(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;Beijing Power Machinery Research Institute,Beijing 100074,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2023年第4期105-114,共10页
Infrared and Laser Engineering
基金
国家自然科学基金(51775289)
山东省自然科学基金(ZR2018ZB0524)
山东省重点研发计划项目(2019GGX104097,2019JZZY010402)
高等学校学科创新引智计划(D21017)
青岛西海岸新区2020年度科技源头创新专项项目(2020-103)。
关键词
飞秒激光
供油孔
数值模拟
螺旋钻孔
femtosecond laser
oil injection hole
numerical simulation
helical drilling
