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电防锈磨削的加工性能研究

金刚石与磨料磨具工程 2024年第1期44卷 85-91页

作者：蔡中伟孙玉利陈法宇盛一左敦稳南京航空航天大学机电学院南京210016 南京星合精密智能制造研究院南京211106

针对传统磨削加工在磨削液使用方面带来的污染环境、危害人体健康和增加生产加工成本等问题,提出采用自来水代替传统磨削液的电防锈磨削加工方法,利用自主研制的电防锈磨削系统对其开展加工性能研究,对比分析了电防锈磨削与干磨削、湿... 详细信息

针对传统磨削加工在磨削液使用方面带来的污染环境、危害人体健康和增加生产加工成本等问题,提出采用自来水代替传统磨削液的电防锈磨削加工方法,利用自主研制的电防锈磨削系统对其开展加工性能研究,对比分析了电防锈磨削与干磨削、湿磨削在磨削力、磨削力比、比磨削能、磨削温度和加工表面粗糙度上的差异。结果表明:电防锈磨削在各项指标上与干磨削的平均差异约为19.2%,与湿磨削的平均差异约为7.7%,其加工性能远高于干磨削,并接近于湿磨削。因此,电防锈磨削加工方法具有一定的可应用性。

关键词：绿色磨削电防锈自来水磨削力磨削温度粗糙度

基于Taguchi-GA协同的磁性磨料抛光性能预测及制备工艺参数寻优

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湖南大学学报（自然科学版） 2024年第4期51卷 43-53页

作者：王燎原孙玉利张桂冠吴鹏飞易思广孙业斌左敦稳南京航空航天大学机电学院江苏南京210016 山东理工大学先进制造研究院山东淄博255049

通过改变黏结法磁性磨料的制备工艺参数来设计正交试验,制备不同系列规格的磁性磨料,并对其进行形貌和成分检测.以3D打印AlSi10Mg板为加工对象,通过平面磁力研磨试验,揭示磁性磨料制备工艺参数对磁力研磨质量的影响规律.基于回归分析,... 详细信息

通过改变黏结法磁性磨料的制备工艺参数来设计正交试验,制备不同系列规格的磁性磨料,并对其进行形貌和成分检测.以3D打印AlSi10Mg板为加工对象,通过平面磁力研磨试验,揭示磁性磨料制备工艺参数对磁力研磨质量的影响规律.基于回归分析,建立参数与响应之间的回归模型,通过遗传算法实现参数优化.结果表明,在SiC粒径为18~25µm,Fe与SiC的质量比为4.7,环氧树脂与聚酰胺的质量比为2,固化温度为100℃的条件下,材料去除率为1.7 mg/min,表面粗糙度由原始的3.90µm降低至0.27µm,降低率为93.1%.

关键词：优化遗传算法磁性磨料磁力研磨抛光性能

基于改进多头绒泡菌算法的布线空间预处理技术

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机械制造与自动化 2024年第3期53卷 132-136页

作者：蔡超利张丹郭权左敦稳南京航空航天大学机电学院江苏南京210016

随着机电产品中线缆布局设计难度的提高,布线设计自动化成为研究热点,其中首先需要根据产品结构获得离散化的搜索空间。为解决当前空间离散化时普遍存在的空间降维难题,提出基于多头绒泡菌算法的空间预处理技术,根据布线敷设工艺要求建... 详细信息

随着机电产品中线缆布局设计难度的提高,布线设计自动化成为研究热点,其中首先需要根据产品结构获得离散化的搜索空间。为解决当前空间离散化时普遍存在的空间降维难题,提出基于多头绒泡菌算法的空间预处理技术,根据布线敷设工艺要求建立初始离散空间,设计基于工艺约束的黏菌网络流运动规则和网络收敛策略;基于改进的多头绒泡菌算法对初始离散空间进行降维处理,获得布线空间离散模型,通过实例验证了所提方法的有效性。

关键词：自动布线空间预处理多头绒泡菌算法

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微磨料气射流加工技术研究现状与展望

航空制造技术 2024年第5期67卷 14-26页

作者：张桂冠赵玉刚赵国勇高跃武孟建兵孙玉利左敦稳山东理工大学先进制造研究院淄博255049 山东理工大学机械工程学院淄博255049 南京航空航天大学江苏省精密与微细制造技术重点实验室南京210016

微磨料射流加工技术是一种基于高能流体的磨粒冲蚀磨损加工技术,已广泛应用于难加工材料、复杂三维型面、光滑表面的加工。为进一步提高磨料射流加工过程中的精准控形控性能力,国内外学者开展了诸多基础加工理论与工艺探索等方面的研究... 详细信息

微磨料射流加工技术是一种基于高能流体的磨粒冲蚀磨损加工技术,已广泛应用于难加工材料、复杂三维型面、光滑表面的加工。为进一步提高磨料射流加工过程中的精准控形控性能力,国内外学者开展了诸多基础加工理论与工艺探索等方面的研究工作。本文在概述磨料射流加工技术发展的基础上,全面总结了国内外学者在微磨料气射流加工(MAJM)技术中的微磨料气射流束发散效应及其抑制策略、材料力学性能对材料冲蚀去除模式的影响、材料冲蚀加工过程磨料嵌入抑制策略、微结构冲蚀加工几何特征等方面的主要研究成果,并对微磨料射流加工技术的难点与发展趋势进行了展望。

关键词：微磨料气射流加工(MAJM)技术材料冲蚀去除机理微结构几何特征磨料磨料嵌入难加工材料

全粒子推动野马优化算法的无人机三维路径规划

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系统仿真学报 2024年第3期36卷 595-607页

作者：李高扬黎向锋赵康金玉超易志东左敦稳南京航空航天大学机电学院江苏南京210000

针对无人机路径规划求解计算量大、难收敛等问题,提出了一种基于全粒子推动野马算法的路径规划方法。建立三维环境模型与路径代价模型,将路径规划问题转化为多维函数优化问题;采用一种自适应邻域搜索策略,改善算法的开发能力;利用高斯... 详细信息

针对无人机路径规划求解计算量大、难收敛等问题,提出了一种基于全粒子推动野马算法的路径规划方法。建立三维环境模型与路径代价模型,将路径规划问题转化为多维函数优化问题;采用一种自适应邻域搜索策略,改善算法的开发能力;利用高斯随机游走策略对个体的历史最优位置进行回溯搜索,改善算法的探索能力;考虑到自适应策略对初始种群多样性敏感的问题,结合Tent混沌映射初始化种群,提高算法的鲁棒性以及全局寻优能力;将提出的改进算法在13个经典测试函数中进行性能验证,并移植于无人机三维路径规划问题中。在30峰、40峰、50峰的环境模型下进行测试,与遗传算法、粒子群算法、SRM-PSO(self-regulating and self-perception particle swarm optimization with mutation mechanism)算法以及野马算法对比,全粒子推动野马算法皆取得最短平均路径,且在所有测试中都找到满足约束、无碰的路径。仿真结果证明,在复杂环境下全粒子推动野马算法具有优秀的全局寻优能力以及较好的鲁棒性。

关键词：野马算法自适应邻域搜索高斯随机游走 Tent混沌映射无人机路径规划全粒子推动

Improvement of Joint Strength of SiCp/Al Metal Matrix Composite in Transient Liquid Phase Bonding Using Cu/Ni/Cu Film Interlayer

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Journal of Materials Science & Technology 2006年第3期22卷 291-294页

作者： Rongfa CHEN dunwen zuo Min WANG Department of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Department of Mechanical Engineering Yangzhou University Yangzhou 225009 China

The compact oxide on the surface of SiCp/Al metal matrix composite （SiCp/Al MMC） greatly depends on the property of the joint. Inlaid sputtering target was applied to etch the oxide completely on the bonding surface of SiCp/Al MMC by plasma erosion. Cu/Ni/Cu film of 5μm in thickness was prepared by magnetron sputtering method on the clean bonding surface in the same vacuum chamber, which was acted as an interlayer in transient liquid phase （TLP） bonding process. Compared with the same thickness of single Cu foil and Ni foil interlayer, the shear strength of 200 MPa was obtained using Cu/Ni/Cu film interlayer during TLP bonding, which was 89.7% that of base metal. In addition, homogenization of the bonding region and no particle segregation in interfacial region were found by analysis of the joint microstructure. Scanning electron microscopy （SEM） was used to observe the micrograph of the joint interface. The result shows that a homogenous microstructure of joint was achieved, which is similar with that of based metal.

关键词： SiCp/Al MMC Magnetron sputtering Cu/Ni/Cu film Transient liquid-phase(TLP) bonding

A review of friction stir joining of SiCp/Al composites

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Chinese Journal of Aeronautics 2020年第3期33卷 792-804页

作者： Lisheng zuo Xianrui ZHAO Zeyang LI dunwen zuo Hongfeng WANG College Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Naval Architecture&Ocean Engineering Jiangsu Maritime InstituteNanjing 211170China

SiCp/Al composites have excellent comprehensive properties and have been widely used in aerospace,automotive industry and other *** to the huge difference in performance between SiC particles and matrix alloys,traditional fusion welding methods are difficult to meet the join requirements of SiCp/Al *** stir joining(friction stir welding),as a solid phase joining process,has been proved to be a new technology with fine prospect in joining SiCp/Al composites compared with fusion welding *** some progress has been made in recent years,there are still full of *** this paper,the research status of friction stir joining of SiCp/Al composites in recent years is expatiated,including the weldability of SiCp/Al composites,the macrostructure and the microstructure of joints,mechanical properties of joints,and tool wear and ***,the existing challenges of friction stir joining of SiCp/Al composites are summarized and the future development directions are prospected.

关键词： Friction stir joining Mechanical properties Microstructure SiCp/Al composites Tool wear

Forces and Stresses During Friction Stir Joining of 2024 Aluminum Alloy

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第2期33卷 237-242页

作者： Deng Yongfang zuo dunwen Song Bo College of Mechanical & Electrical Engineering Nanjing University of Aeronautics and Astronautics Institute of Engineering and Research Jiangxi University of Science and Technology

An attempt is made to measure three direction forces using octagonal ring dynamometer in the 2024 aluminum alloy friction stir joining(FSJ)process.A test is made to measure the specific area stress and stress distributions in the specific area of the workpiece are *** workpiece stresses in the FSJ process are analyzed by numerical simulation *** is found that,in the downward stage of the process,feed force and lateral force in the tool are small,almost zero,and the maximum axial force can reach *** the stable joining stage,the forces acting on the tool become *** with the low speed,high feed speed results in small feed force and small lateral force,but large feed force in the stable joining *** stresses in three directions of feed direction,direction that perpendicular to butt face and direction perpendicular to the surface are *** simulation stress value of measure point is *** and numerical simulation can authenticate each *** experimental stress values and numerical simulation stress values are credible.

关键词： friction stir joining(FSJ) force stress 2024 aluminum alloy

Microstructure and Oxidation Behaviors of Nano-particles Strengthened NiCoCrAlY Cladded Coatings on Superalloys

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Chinese Journal of Mechanical Engineering 2010年第3期23卷 297-304页

作者： WANG Hongyu zuo dunwen CHEN Xinfeng YU Shouxin GU Yuanzhi Jiangsu Provincial Key Laboratory of Precision and Micro-manufacturing Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China School of Mechanical Engineering Jiangsu University Zhenjiang 212013 China

Nano-particles which can largely improve the microstructure and oxidation resistance of materials are often used as a strengthening component in metal matrix composites. However, few studies were reported on its application in the bond coat of duplex structure thermal barrier coating（TBC）. Three kinds of NiCoCrAlY coatings strengthened by different nano-particles with the same addition （1%, mass fraction） were prepared by the laser cladding technique on Ni-based superalloy substrates, aiming to study the effects of the nano-particles on microstructure and oxidation resistance of NiCoCrAlY coatings （the bond coat of the duplex structure thermal barrier coatings）. Scanning electron microscope （SEM）, X-ray diffractometer（XRD） and thermogravimetry were employed to investigate their morphologies, phases and cyclic oxidation behaviors in atmosphere at 1 050℃, compared with the coating without nano-particles. With the addition of nano-particles, the growth pattern of the grains at the interface changed from epitaxial growth to non-epitaxial growth or part-epitaxial growth; slender dendrites were broken and cellularized; cracks and pores were restrained; and the oxidation weight-gain and the stripping resistance of the oxide scale were improved as well. Among the three kinds of nano-particles, the SiC nano-particles showed the most improvement on microstructure, while the CeO2 nano-particles were insufficient, but its effects on the oxidation resistance are the same as those of the SiC nano-particles. Based on the discussions of the influence mechanism, it is believed that CeO2 nano-particles would show better improvement than SiC nano-particles if the proper amount is added and the proper preparation technique of micro-nanometer composite powders is adopted, with the synergistic action of nanometer effect and reactive element effect.

关键词： high-temperature protective coating nano-particle microstructure cyclic oxidation laser cladding