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Nano-enhanced biolubricant in sustainable manufacturing:From processability to mechanisms 被引量:10
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作者 Yanbin ZHANG Hao Nan LI +12 位作者 Changhe LI Chuanzhen HUANG Hafiz Muhammad ALI Xuefeng XU Cong MAO Wenfeng DING Xin CUI Min YANG Tianbiao YU Muhammad JAMIL Munish Kumar GUPTA Dongzhou JIA Zafar SAID 《Friction》 SCIE EI CAS CSCD 2022年第6期803-841,共39页
To eliminate the negative effect of traditional metal-working fluids and achieve sustainable manufacturing,the usage of nano-enhanced biolubricant(NEBL)is widely researched in minimum quantify lubrication(MQL)machinin... To eliminate the negative effect of traditional metal-working fluids and achieve sustainable manufacturing,the usage of nano-enhanced biolubricant(NEBL)is widely researched in minimum quantify lubrication(MQL)machining.It's improved tool wear and surface integrity have been preliminarily verified by experimental studies.The previous review papers also concluded the major influencing factors of processability including nano-enhancer and lubricant types,NEBL concentration,micro droplet size,and so on.Nevertheless,the complex action of NEBL,from preparation,atomization,infiltration to heat transfer and anti-friction,is indistinct which limits preparation of process specifications and popularity in factories.Especially in the complex machining process,in-depth understanding is difficult and meaningful.To fll this gap,this paper concentrates on the comprehensive quantitative assessment of processability based on tribological,thermal,and machined surface quality aspects for NEBL application in turning,milling,and grinding.Then it attempts to answer mechanisms systematically considering multi-factor influence of molecular structure,physicochemical properties,concentration,and dispersion.Firstly,this paper reveals advanced lubrication and heat transfer mechanisms of NEBL by quantitative comparison with biolubricant-based MQL machining.Secondly,the distinctive filmformation,atomization,and infiltration mechanisms of NEBL,as distinguished from metal-working fluid,are clarified combining with its unique molecular structure and physical properties.Furtherly,the process optimization strategy is concluded based on the synergistic relationship analysis among process variables,physicochemical properties,machining mechanisms,and performance of NEBL.Finally,the future development directions are put forward aiming at current performance limitations of NEBL,which requires improvement on preparation and jet methods respects.This paper will help scientists deeply understand effective mechanism,formulate process specifications,and find 展开更多
关键词 nano-enhanced biolubricant(NEBL) sustainable manufacturing minimum quantity lubrication(mql) tribological properties machining mechanisms
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Prediction model of volume average diameter and analysis of atomization characteristics in electrostatic atomization minimum quantity lubrication 被引量:6
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作者 Dongzhou JIA Changhe LI +5 位作者 Jiahao LIU Yanbin ZHANG Min YANG Teng GAO Zafar SAID Shubham SHARMA 《Friction》 SCIE EI CAS CSCD 2023年第11期2107-2131,共25页
Minimum quantity lubrication(MQL)is a relatively efficient and clean alternative to flooding workpiece machining.Electrostatic atomization has the merits of small droplet diameter,high uniformity of droplet size,and s... Minimum quantity lubrication(MQL)is a relatively efficient and clean alternative to flooding workpiece machining.Electrostatic atomization has the merits of small droplet diameter,high uniformity of droplet size,and strong coating,hence its superiority to pneumatic atomization.However,as the current research hotspot,the influence of jet parameters and electrical parameters on the average diameter of droplets is not clear.First,by observing the shape of the liquid film at the nozzle outlet,the influence law of air pressure and voltage on liquid film thickness(h)and transverse and longitudinal fluctuations are determined.Then,the mathematical model of charged droplet volume average diameter(VAD)is constructed based on three dimensions of the liquid film,namely its thickness,transverse wavelength(λ_(h)),and longitudinal wavelength(λ_(z)).The model results under different working conditions are obtained by numerical simulation.Comparisons of the model results with the experimental VAD of the droplet confirm the error of the mathematical model to be less than 10%.The droplet diameter distribution span value Rosin–Rammler distribution span(R.S)and percentage concentrations of PM10(particle size of less than 10μm)/PM2.5(particle size of less than 2.5μm)under different working conditions are further analyzed.The results show that electrostatic atomization not only reduces the diameter distribution span of atomized droplets but also significantly inhibits the formation of PM10 and PM2.5 fine-suspension droplets.When the air pressure is 0.3 MPa,and the voltage is 40 kV,the percentage concentrations of PM10 and PM2.5 can be reduced by 80.72%and 92.05%,respectively,compared with that under the pure pneumatic atomization condition at 0.3 MPa. 展开更多
关键词 minimum quantity lubrication(mql) electrostatic atomization volume average diameter(VAD) atomization characteristics
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Tribological Performance of Different Concentrations of Al_(2)O_(3)Nanofluids on Minimum Quantity Lubrication Milling 被引量:5
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作者 Xiufang Bai Juan Jiang +3 位作者 Changhe Li Lan Dong Hafiz Muhammad Ali Shubham Sharma 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2023年第4期67-78,共12页
Nanofluid minimum quantity lubrication(NMQL)is a green processing technology.Cottonseed oil is suitable as base oil because of excellent lubrication performance,low freezing temperature,and high yield.Al_(2)O_(3)nanop... Nanofluid minimum quantity lubrication(NMQL)is a green processing technology.Cottonseed oil is suitable as base oil because of excellent lubrication performance,low freezing temperature,and high yield.Al_(2)O_(3)nanoparticles improve not only the heat transfer capacity but also the lubrication performance.The physical and chemical proper-ties of nanofluid change when Al_(2)O_(3)nanoparticles are added.However,the effects of the concentration of nanofluid on lubrication performance remain unknown.Furthermore,the mechanisms of interaction between Al_(2)O_(3)nanoparti-cles and cottonseed oil are unclear.In this research,nanofluid is prepared by adding different mass concentrations of Al_(2)O_(3)nanoparticles(0,0.2%,0.5%,1%,1.5%,and 2%wt)to cottonseed oil during minimum quantity lubrication(MQL)milling 45 steel.The tribological properties of nanofluid with different concentrations at the tool/workpiece interface are studied through macro-evaluation parameters(milling force,specific energy)and micro-evaluation parameters(surface roughness,micro morphology,contact angle).The result show that the specific energy is at the minimum(114 J/mm^(3)),and the roughness value is the lowest(1.63μm)when the concentration is 0.5 wt%.The surfaces of the chip and workpiece are the smoothest,and the contact angle is the lowest,indicating that the tribological proper-ties are the best under 0.5 wt%.This research investigates the intercoupling mechanisms of Al_(2)O_(3)nanoparticles and cottonseed base oil,and acquires the optimal Al_(2)O_(3)nanofluid concentration to receive satisfactory tribological properties. 展开更多
关键词 MILLING Al_(2)O_(3)nanofluid Minimum quantity lubrication(mql) Surface micromorphology
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Influence of Minimum Quantity Lubrication Parameters on Tool Wear and Surface Roughness in Milling of Forged Steel 被引量:4
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作者 YAN Lutao YUAN Songmei LIU Qiang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2012年第3期419-429,共11页
The minimum quantity of lubrication(MQL) technique is becoming increasingly more popular due to the safety of environment.Moreover,MQL technique not only leads to economical benefits by way of saving lubricant costs... The minimum quantity of lubrication(MQL) technique is becoming increasingly more popular due to the safety of environment.Moreover,MQL technique not only leads to economical benefits by way of saving lubricant costs but also presents better machinability.However,the effect of MQL parameters on machining is still not clear,which needs to be overcome.In this paper,the effect of different modes of lubrication,i.e.,conventional way using flushing,dry cutting and using the minimum quantity lubrication(MQL) technique on the machinability in end milling of a forged steel(50CrMnMo),is investigated.The influence of MQL parameters on tool wear and surface roughness is also discussed.MQL parameters include nozzle direction in relation to feed direction,nozzle elevation angle,distance from the nozzle tip to the cutting zone,lubricant flow rate and air pressure.The investigation results show that MQL technique lowers the tool wear and surface roughness values compared with that of conventional flood cutting fluid supply and dry cutting conditions.Based on the investigations of chip morphology and color,MQL technique reduces the cutting temperature to some extent.The relative nozzle-feed position at 120°,the angle elevation of 60° and distance from nozzle tip to cutting zone at 20 mm provide the prolonged tool life and reduced surface roughness values.This fact is due to the oil mists can penetrate in the inner zones of the tool edges in a very efficient way.Improvement in tool life and surface finish could be achieved utilizing higher oil flow rate and higher compressed air pressure.Moreover,oil flow rate increased from 43.8 mL?h to 58.4 mL?h leads to a small decrease of flank wear,but it is not very significant.The results obtained in this paper can be used to determine optimal conditions for milling of forged steel under MQL conditions. 展开更多
关键词 minimum quantity lubricationmql MILLING PARAMETER tool wear surface roughness
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Grindability Evaluation of Ultrasonic Assisted Grinding of Silicon Nitride Ceramic Using Minimum Quantity Lubrication Based SiO_(2)Nanofluid
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作者 Yusuf Suleiman Dambatta Changhe Li +8 位作者 Mohd Sayuti Ahmed A D Sarhan Min Yang Benkai Li Anxue Chu Mingzheng Liu Yanbin Zhang Zafar Said Zongming Zhou 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2024年第2期115-136,共22页
Minimum quantity Lubrication(MQL)is a sustainable lubrication system that is famous in many machining systems.It involve the spray of an infinitesimal amount of mist-like lubricants during machining processes.The MQL ... Minimum quantity Lubrication(MQL)is a sustainable lubrication system that is famous in many machining systems.It involve the spray of an infinitesimal amount of mist-like lubricants during machining processes.The MQL system is affirmed to exhibit an excellent machining performance,and it is highly economical.The nanofluids are understood to exhibit excellent lubricity and heat evacuation capability,compared to pure oil-based MQL system.Studies have shown that the surface quality and amount of energy expended in the grinding operations can be reduced considerably due to the positive effect of these nanofluids.This work presents an experimental study on the tribological performance of SiO_(2)nanofluid during grinding of Si_(3)N_(4)ceramic.The effect different grinding modes and lubrication systems during the grinding operation was also analyzed.Different concentrations of the SiO_(2)nanofluid was manufactured using canola,corn and sunflower oils.The quantitative evaluation of the grinding process was done based on the amount of grinding forces,specific grinding energy,frictional coefficient,and surface integrity.It was found that the canola oil exhibits optimal lubrication performance compared to corn oil,sunflower oil,and traditional lubrication systems.Additionally,the introduction of ultrasonic vibrations with the SiO_(2)nanofluid in MQL system was found to reduce the specific grinding energy,normal grinding forces,tangential grinding forces,and surface roughness by 65%,57%,65%,and 18%respectively.Finally,regression analysis was used to obtain an optimum parameter combinations.The observations from this work will aid the smooth transition towards ecofriendly and sustainable machining of engineering ceramics. 展开更多
关键词 Minimum quantity lubrication(mql) Ultrasonic assisted grinding(UAG) Eco-friendly lubricants NANOFLUID GRINDING CERAMIC
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EFFECT OF COOLING/LUBRICATION MEDIUM ON MACHINABILITY OF Ti6Al4V 被引量:5
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作者 戚宝运 何宁 李亮 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2011年第3期225-230,共6页
To better understand and know the roles of cooling/lubrication medium in the cutting process and expand their applicability,uncoated cemented carbide tools are used in high-speed turning Ti6Al4V.Dry,cold air,minimal q... To better understand and know the roles of cooling/lubrication medium in the cutting process and expand their applicability,uncoated cemented carbide tools are used in high-speed turning Ti6Al4V.Dry,cold air,minimal quantity lubrication(MQL),cryogenic MQL,and ionized air as the cooling/lubrication conditions are studied.Experimental results show that at speed 120 m/min turning Ti6Al4V,the cutting force under ionized air is smallest under all lubricant conditions,and tool life is best,next is cryogenic MQL.MQL and cold air almost have the same effect,a little better than dry.Meanwhile the smallest surface roughness is also obtained under ionized air condition.Flank wear and crater wear are the dominant failure modes when high-speed turning Ti6Al4V by SEM analysis.Finally the conclusion is drawn that ionized air and cryogenic MQL have better cooling/lubrication effects and can effectively improve the tool life. 展开更多
关键词 cooling/lubrication high-speed turning TI6AL4V minimal quantity lubricationmql ionized air
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Performance evaluation of nanofluid-based minimum quantity lubrication grinding of Ni-Cr alloy under the influence of CuO nanoparticles 被引量:1
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作者 Roshan Lal Virdi Sukhpal Singh Chatha Hazoor Singh 《Advances in Manufacturing》 SCIE EI CAS CSCD 2021年第4期580-591,共12页
In machining processes,researchers are actively engaged in exploring minimum quantity lubrication(MQL)as a possible alternative to traditional flood cooling owing to economic and ecological concerns.The search for eco... In machining processes,researchers are actively engaged in exploring minimum quantity lubrication(MQL)as a possible alternative to traditional flood cooling owing to economic and ecological concerns.The search for ecologically safe lubricants has attracted the attention of scientists looking to use vegetable oil as a lubricant.The nanofluid MQL technique with biodegradable oils as the base is a relatively new method with the potential to replace mineral oils.In the present study,the grinding of Inconel-718 alloy was investigated using nanofluid MQL(NFMQL)with biodegradable oils as the base.Nanofluids are composed by dispersing 0.5%(mass fraction)and 1%(mass fraction)of CuO nanoparticles in vegetable oil.The surface morphology,G-ratio,forces,and grinding energy were examined under pure MQL,NFMQL,and dry and flood lubrication conditions.The experimental results indicated that the nanofluid MQL significantly improved the machining performance.Owing to the polishing and rolling effect of nanoparticles on the tool work interface,a surface finish under a 0.5%(mass fraction)nanofluid was found to be better than pure MQL-dry and flood lubrication conditions.The NFMQL technique with 1%(mass fraction)CuO nanoparticles with palm oil as the base helped in achieving a better evacuation of chips from the grinding zone,leading to a better surface finish with a high material removal rate along with less energy consumption compared to flood and dry grinding. 展开更多
关键词 Minimum quantity lubrication(mql) NANOPARTICLES GRINDING Vegetable oils Inconel-718 alloy
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MoS2/CNTs混合纳米流体微量润滑磨削加工表面质量试验评价 被引量:20
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作者 张彦彬 李长河 +6 位作者 贾东洲 李本凯 王要刚 杨敏 侯亚丽 张乃庆 吴启东 《机械工程学报》 EI CAS CSCD 北大核心 2018年第1期161-170,共10页
结合国内外对混合纳米流体微量润滑磨削的研究现状,研究二硫化钼和碳纳米管混合纳米流体微量润滑磨削镍基合金的工件表面质量。以工件表面粗糙度Ra值、表面轮廓曲线的自相关分析和工件表面微观形貌,作为表面质量表征参数。试验结果表明... 结合国内外对混合纳米流体微量润滑磨削的研究现状,研究二硫化钼和碳纳米管混合纳米流体微量润滑磨削镍基合金的工件表面质量。以工件表面粗糙度Ra值、表面轮廓曲线的自相关分析和工件表面微观形貌,作为表面质量表征参数。试验结果表明:纳米流体微量润滑由于纳米粒子高的强化换热能力从而避免了工件烧伤;混合纳米流体由于起到了'物理协同作用',较单一纳米流体得到了最低的表面粗糙度Ra值(0.311μm)和磨削温度峰值(52.8℃);随纳米流体质量分数的增加,表面粗糙度Ra值呈现上升趋势,这是由于质量分数的增加改变了微量润滑雾滴与工件的接触角,从而改变了浸润面积;而摩擦因数和磨削温度峰值在6%取得最低值后呈上升趋势,这是由于纳米粒子的团聚破坏了纳米流体性能。通过工件表面轮廓曲线的自相关分析进一步验证,纳米粒子在磨削区起到'润滑作用'和'微加工'作用,从而提高了加工精度。因此,综合磨削性能、表面粗糙度和自相关分析,选择混合纳米流体质量分数6%为纳米流体的优选质量分数。 展开更多
关键词 磨削 微量润滑 混合纳米流体 表面质量 自相关分析
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微量润滑平面磨削接触区换热机理的研究 被引量:15
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作者 毛聪 邹洪富 +1 位作者 黄勇 周志雄 《中国机械工程》 EI CAS CSCD 北大核心 2014年第6期826-831,共6页
磨削接触区材料去除厚度是不一致的,同时,在微量润滑过程中,雾滴之间的运动特征存在差异且易受其他因素的影响,致使整个接触区的磨削温度分布呈现出非线性,换热机理也异常复杂。从雾化机理出发,对影响换热效果的两个关键因素——雾滴直... 磨削接触区材料去除厚度是不一致的,同时,在微量润滑过程中,雾滴之间的运动特征存在差异且易受其他因素的影响,致使整个接触区的磨削温度分布呈现出非线性,换热机理也异常复杂。从雾化机理出发,对影响换热效果的两个关键因素——雾滴直径和雾滴速度进行了分析。依据雾滴在不同壁温处表现出的不同换热特性,将磨削区划分为无沸腾换热、核态沸腾换热、过渡沸腾换热和稳定膜态沸腾换热四个不同的换热区域,建立了微量润滑磨削区的换热系数数学模型。在此基础上,运用有限元技术对微量润滑磨削表面的温度场进行了仿真分析,采用单级热电偶技术测量了磨削温度,发现磨削区仿真温度值与实验测量值吻合较好,表明通过该理论获得的微量润滑磨削表面换热系数是可信的。 展开更多
关键词 平面磨削 微量润滑 换热机理 换热系数 沸腾
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微量润滑复合增效技术及其应用研究进展 被引量:12
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作者 杨简彰 王成勇 +4 位作者 袁尧辉 袁松梅 王西彬 梁赐乐 李伟秋 《中国机械工程》 EI CAS CSCD 北大核心 2022年第5期506-528,共23页
微量润滑技术具有切削液用量少、润滑效率高等优点,但在特定工况下仍存在冷却性不足以及润滑不充分等问题。微量润滑复合增效技术,如低温冷风、液态CO_(2)等,综合了良好冷却和润滑优势,可有效解决难加工材料清洁切削加工难题。综述了各... 微量润滑技术具有切削液用量少、润滑效率高等优点,但在特定工况下仍存在冷却性不足以及润滑不充分等问题。微量润滑复合增效技术,如低温冷风、液态CO_(2)等,综合了良好冷却和润滑优势,可有效解决难加工材料清洁切削加工难题。综述了各类微量润滑复合增效技术原理、关键装置及其工艺应用最新研究进展,详细剖析了各类装置性能及其参数调控特性。结合微量润滑复合增效应用形式和作用机制,系统分析了其在钛合金、镍基合金、不锈钢等难加工材料的应用性能,并对各类微量润滑复合增效技术进行了可持续性分析,为清洁切削技术的工程应用提供技术支撑和参考。 展开更多
关键词 微量润滑 低温切削 复合增效技术 切削加工
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微量润滑系统参数对雾化特性的影响 被引量:11
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作者 孔晓瑶 袁松梅 +1 位作者 朱光远 张文杰 《中国机械工程》 EI CAS CSCD 北大核心 2021年第5期579-586,共8页
微量润滑切削过程中,系统的雾化特性会影响界面间的雾粒渗透效果。采用激光粒度分析仪对微量润滑系统的雾化特性进行了单因素试验测试,研究了空气流量、喷射距离、切削液用量以及切削液类型等系统参数对雾粒平均直径及其尺寸分布的影响... 微量润滑切削过程中,系统的雾化特性会影响界面间的雾粒渗透效果。采用激光粒度分析仪对微量润滑系统的雾化特性进行了单因素试验测试,研究了空气流量、喷射距离、切削液用量以及切削液类型等系统参数对雾粒平均直径及其尺寸分布的影响。结果表明,空气流量、喷射距离为主要影响因素,当空气流量保持在80~90 L/min、喷射距离控制在40~50 mm范围内时能够获得较好的雾化效果。基于因次分析法建立了微量润滑条件下的雾粒直径预测模型,其误差小于10%,能够较好地描述微量润滑系统参数对雾化特性的影响。 展开更多
关键词 微量润滑 雾化特性 雾粒尺寸分布 因次分析法
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MQL条件下的油滴覆盖率及尺寸分布研究 被引量:7
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作者 张松 张成良 +2 位作者 石文浩 吕盈 陈杰 《机械工程学报》 EI CAS CSCD 北大核心 2018年第3期169-177,共9页
微量润滑(Minimum quantity lubrication,MQL)切削过程中,刀具-切屑界面和刀具-工件界面的油滴覆盖率、油滴大小及其尺寸分布是决定切削区油膜均匀性和覆盖面积大小的重要因素,进而直接影响微量切削油的润滑性能。针对不同喷射距离和气... 微量润滑(Minimum quantity lubrication,MQL)切削过程中,刀具-切屑界面和刀具-工件界面的油滴覆盖率、油滴大小及其尺寸分布是决定切削区油膜均匀性和覆盖面积大小的重要因素,进而直接影响微量切削油的润滑性能。针对不同喷射距离和气体流量下的油滴覆盖率、油滴大小及其尺寸分布进行研究。借助于图像处理技术,获得不同喷射距离和气体流量下的油滴位图,分析油滴形状以及喷射距离对油滴覆盖率的影响规律;然后,利用油滴体积计算模型,阐释油滴尺寸分布与气体流量之间的内在关系。研究表明:适当缩短喷射距离和增大气体流量可以提高油滴覆盖率和减少油滴尺寸,进而充分发挥MQL技术的润滑性能。 展开更多
关键词 微量润滑(mql) 润滑油膜 油滴覆盖率 油滴尺寸分布
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纳米流体微量润滑铣削润滑性能的实验研究 被引量:8
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作者 柏秀芳 董兰 +1 位作者 李长河 张月雷 《组合机床与自动化加工技术》 北大核心 2018年第4期15-18,共4页
针对大量使用切削液对环境和工人健康造成极大的伤害,结合国内外纳米流体微量润滑的研究现状,选取干式、浇注式、微量润滑和纳米流体微量润滑四种工况在加工中心进行铣削试验,分别从铣削力、铣削温度和表面粗糙度三个方面进行了润滑性... 针对大量使用切削液对环境和工人健康造成极大的伤害,结合国内外纳米流体微量润滑的研究现状,选取干式、浇注式、微量润滑和纳米流体微量润滑四种工况在加工中心进行铣削试验,分别从铣削力、铣削温度和表面粗糙度三个方面进行了润滑性能研究。实验结果显示,纳米流体微量润滑条件下获得的铣削力最小,在x,y,z三个方向上比干式铣削分别降低了15%,19%和14%。纳米流体微量润滑铣削温升峰值接近浇注式铣削,比干铣削降低了41.8℃。纳米流体微量润滑铣削获得的表面粗糙度最小,表面质量最好,比干式铣削分别降低了50%和63.5%。因此,纳米流体微量润滑可以为铣削提供更好的润滑条件,可以替代浇注式成为绿色环保的铣削加工方式。 展开更多
关键词 纳米流体 微量润滑 铣削 润滑性能
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基于静电微量润滑技术的磨削加工性能试验研究 被引量:8
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作者 林建斌 吕涛 +2 位作者 黄水泉 胡晓冬 许雪峰 《中国机械工程》 EI CAS CSCD 北大核心 2018年第23期2783-2791,2798,共10页
在构建静电微量润滑(EMQL)磨削加工系统的基础上,分析了不同荷电电压下润滑液液滴的荷质比和润湿渗透性能,研究了正负荷电电压下静电微量润滑技术的磨削加工特性。通过分析工件表层的显微硬度和显微组织,揭示了静电微量润滑技术的磨削... 在构建静电微量润滑(EMQL)磨削加工系统的基础上,分析了不同荷电电压下润滑液液滴的荷质比和润湿渗透性能,研究了正负荷电电压下静电微量润滑技术的磨削加工特性。通过分析工件表层的显微硬度和显微组织,揭示了静电微量润滑技术的磨削加工作用机理。结果表明:荷电液滴的表面张力与润湿角减小,液滴的渗透性和润湿性提高。与传统微量润滑(MQL)相比,荷电液滴更易在砂轮-工件接触面渗透铺展,提升了润滑与换热能力,在正荷电静电微量润滑条件下,工件表层显微组织中的铁素体相对含量增加,工件表层显微硬度降低,磨削加工性能更好。 展开更多
关键词 微量润滑 静电微量润滑 水基润滑液 显微硬度 显微组织 磨削性能
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基于MQL的超声椭圆振动微切削Inconel718的机理研究 被引量:7
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作者 王大中 吴淑晶 +2 位作者 林靖朋 郭国强 王鹏 《机械工程学报》 EI CAS CSCD 北大核心 2021年第9期264-272,共9页
研究不同切削条件下的超声椭圆振动(Ultrasonic elliptical vibration,UEV)对Inconel718微切削性能的影响规律,讨论微量润滑(Minimum quantity lubrication,MQL)和UEV切削对加工性能的影响机理。针对微量润滑切削时的不同喷嘴角度,提出... 研究不同切削条件下的超声椭圆振动(Ultrasonic elliptical vibration,UEV)对Inconel718微切削性能的影响规律,讨论微量润滑(Minimum quantity lubrication,MQL)和UEV切削对加工性能的影响机理。针对微量润滑切削时的不同喷嘴角度,提出一种新的换热模型,利用软件对Inconel718微切削的切削力、切削温度进行了仿真研究,并通过试验对不同喷嘴角度下的切削温度的进行了对比,探讨不同喷嘴角度对UEV切削条件下加工性能的影响。研究结果表明,与常规切削相比,UEV切削可降低切削力、切削温度,超声椭圆振动微量润滑切(UEV+MQL)效果明显,喷嘴角度为0°条件下超声振动微切削Inconel718的切削温度降低效果最为明显。 展开更多
关键词 超声椭圆振动(UEV) 微量润滑(mql) 微切削 喷嘴角度
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钻削CFRP的双顶角钻头磨损及抑制新方法 被引量:5
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作者 王福吉 钱宝伟 +3 位作者 成德 贾振元 付饶 殷俊伟 《机械工程学报》 EI CAS CSCD 北大核心 2018年第15期171-179,共9页
为满足高性能碳纤维增强复合材料(CFRP)结构件的高质量制孔需求,现阶段广泛采用双顶角钻头钻削CFRP,但因其“钻、扩、铰”一体的结构形式,双顶角钻头第二主切削刃的磨损程度和状态是决定钻削孔壁质量的关键因素.此外,由于CFRP中碳纤维... 为满足高性能碳纤维增强复合材料(CFRP)结构件的高质量制孔需求,现阶段广泛采用双顶角钻头钻削CFRP,但因其“钻、扩、铰”一体的结构形式,双顶角钻头第二主切削刃的磨损程度和状态是决定钻削孔壁质量的关键因素.此外,由于CFRP中碳纤维磨蚀性强,制孔中钻头快速磨损,切削刃严重钝化,极易导致孔壁损伤.通过引入切削刃钝圆半径,揭示双顶角钻头第二主切削刃钝化后,在严重的后刀面磨损作用下,第二主切削刃刃口钝圆半径又减小的磨损机制,在此基础上,结合不同纤维切削角下CFRP成屑机制,详细探究了双顶角钻头第二主切削刃钝化状态对钻削孔壁损伤的影响规律;最后创新性地在钻头第二主切削刃末端开设内冷孔,利用微量冷却润滑(MQL)工艺,实现了钻头第二主切削刃钝化磨损的有效抑制,显著提升了高性能碳纤维增强复合材料的制孔质量,为高质量复合材料制孔工艺和工具研究奠定了重要基础. 展开更多
关键词 碳纤维增强复合材料(CFRP) 第二主切削刃 切削刃钝化 孔壁质量 微量冷却润滑(mql)
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球形纳米颗粒在镍基合金纳米流体微量润滑磨削界面摩擦学机制的分子动力学研究
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作者 张宇 王德祥 +1 位作者 郭峰 栗心明 《中国机械工程》 EI CAS CSCD 北大核心 2024年第3期445-456,共12页
以1-丁基-3-甲基咪唑四氟硼酸盐([BMIM]BF 4离子液)作为纳米流体基液,以氧化铝和铜纳米颗粒分别作为高硬度类和低硬度类球形纳米颗粒的代表,用分子动力学模拟方法研究了球形纳米颗粒在镍基合金纳米流体微量润滑磨削界面减摩抗磨的摩擦... 以1-丁基-3-甲基咪唑四氟硼酸盐([BMIM]BF 4离子液)作为纳米流体基液,以氧化铝和铜纳米颗粒分别作为高硬度类和低硬度类球形纳米颗粒的代表,用分子动力学模拟方法研究了球形纳米颗粒在镍基合金纳米流体微量润滑磨削界面减摩抗磨的摩擦学机理,并进一步揭示了纳米流体在砂轮磨粒/工件磨削界面润滑成膜的摩擦学机制。研究结果表明,在镍基合金纳米流体微量润滑磨削加工中,砂轮磨粒/工件磨削界面形成了边界润滑膜。由于铜纳米颗粒硬度远低于砂轮磨粒及镍基合金工件,会在磨粒/工件界面出现压缩、剪切、铺展和分离等一系列摩擦学行为,并形成一层固体润滑膜,这层固体膜通过减小磨粒工件之间的直接接触面积来减小切向磨削力,相较于微量润滑工况可使切向磨削力减小4.6%。由于氧化铝纳米颗粒硬度高于镍基合金工件,故在磨削过程中仍能保持原本的球形纳米结构,会在磨粒/工件界面出现滑移、滚动和抛光三种摩擦学行为,抛光划痕可增大离子液体的浸润面积,并减小磨粒工件之间的直接接触面积,“类滚珠”的滚动行为可将磨粒工件之间的滑动摩擦转变为滚动摩擦,从而使切向磨削力较微量润滑工况减小6.6%。 展开更多
关键词 磨削 微量润滑 纳米流体 球形纳米颗粒 摩擦学机制
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基于流体动力学仿真的微量润滑喷嘴参数优化
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作者 王杰伟 《机械工程师》 2024年第9期73-78,共6页
微量润滑(MQL)切削技术在切削加工中获得了良好的加工效果,其中喷嘴参数对微量润滑性能有着重要影响。为改善和优化微量润滑性能,采用正交试验法和ANSYS Fluent软件对气相窄流区宽度、锥度、输出管长度、气相窄流区长度、输出孔径、流量... 微量润滑(MQL)切削技术在切削加工中获得了良好的加工效果,其中喷嘴参数对微量润滑性能有着重要影响。为改善和优化微量润滑性能,采用正交试验法和ANSYS Fluent软件对气相窄流区宽度、锥度、输出管长度、气相窄流区长度、输出孔径、流量等6个因素的影响进行了流体动力学的数值仿真研究和统计分析。结果表明,在不同评价标准下,6个影响因素的主次顺序不同;影响综合指数的最重要参数为距离喷嘴0.1 m处的喷射截面分散程度,影响综合指数的优先顺序为:距离喷嘴0.1 m处的喷射截面分散程度>距离喷嘴0.2 m处的喷射截面分散程度>离喷嘴0.3 m处的喷射截面分散程度>喷射方向衰减率>离喷嘴0.05 m处的喷射绝对速度;喷嘴参数的最优组合为:输出孔径1.5 mm、输出管长度0.5 mm、锥度45°、气相窄流区宽度0.2 mm、气相窄流区长度0.5 mm、流量40 L/min。 展开更多
关键词 微量润滑 喷嘴设计 正交试验设计 计算流体动力学
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低温冷风微量润滑磨削钛合金换热机理与对流换热系数模型 被引量:2
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作者 刘明政 李长河 +6 位作者 张彦彬 杨敏 崔歆 李本凯 高腾 王大中 安庆龙 《机械工程学报》 EI CAS CSCD 北大核心 2023年第23期343-357,共15页
钛合金磨削过程中工件表面热损伤已成为亟需解决的技术难题。微量润滑技术应用于钛合金磨削是实现可持续制造的发展方向,但存在热耗散和润滑减摩能力不足的技术缺陷。利用多能场辅助加工是解决以上技术难题的必然选择,低温冷风取代常温... 钛合金磨削过程中工件表面热损伤已成为亟需解决的技术难题。微量润滑技术应用于钛合金磨削是实现可持续制造的发展方向,但存在热耗散和润滑减摩能力不足的技术缺陷。利用多能场辅助加工是解决以上技术难题的必然选择,低温冷风取代常温空气携带微量润滑剂,可显著提高磨削区液膜换热和润滑性能。但润滑剂物理特性演变规律及磨削区液膜换热机理等科学问题尚需揭示。基于此,研究了润滑剂低温物理特性演变规律,建立了冷风温度与润滑剂物理参数的量化映射关系。分析了低温冷风微量润滑砂轮工件界面流动液膜换热规律,建立了磨削区流动液膜换热量理论模型。进一步,建立了不同冷风条件下润滑剂对流换热系数模型。进行了流动液膜对流换热系数和低温冷风微量润滑磨削钛合金换热性能验证实验,结果显示,对流换热系数理论值与测量值吻合,冷风温度为-10℃时,误差为8.5%;工件表面温度实验值和理论值变化趋势吻合,磨削深度为30μm、冷风温度为-40℃时,误差为7.7%。研究结果为低温冷风微量润滑磨削钛合金提高工件表面完整性提供技术支持。 展开更多
关键词 磨削 钛合金 微量润滑 低温冷风 换热机理
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准干式切削微量润滑装置研究进展
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作者 汪喜 袁尧辉 +2 位作者 李伟秋 王成勇 颜炳姜 《机电工程技术》 2023年第10期25-33,共9页
准干式微量润滑切削技术是我国绿色制造-可持续发展战略的重要内容,而微量润滑装置是该技术的核心。针对外部雾化型和内部雾化型微量润滑技术,系统分析了两种技术对应的外置式微量润滑装置和内置式微量润滑装置技术原理和应用特点,分析... 准干式微量润滑切削技术是我国绿色制造-可持续发展战略的重要内容,而微量润滑装置是该技术的核心。针对外部雾化型和内部雾化型微量润滑技术,系统分析了两种技术对应的外置式微量润滑装置和内置式微量润滑装置技术原理和应用特点,分析了不同类型微量润滑装置配套的油泵、喷嘴以及专用内冷主轴和内冷刀柄等关键部件研究进展和应用形式,并结合微量润滑技术在实际应用中存在的冷却润滑性不足问题,进一步介绍了静电微量润滑、油水复合微量润滑以及纳米流体微量润滑等复合增效型微量润滑技术原理和装置特点,总结分析了系列微量润滑装置应用特点并展望了微量润滑装置发展方向,为微量润滑装置的进一步升级优化和工程应用提供参考。 展开更多
关键词 准干式切削 微量润滑 微量润滑装置 复合增效
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