MoS_2/CNTs混合纳米流体微量润滑磨削加工表面质量试验评价
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摘要
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。
An experimental research on effect of MoS_2/CNTs hybrid nanofluid minimum quantity lubrication(MQL) grinding on workpiece surface quality of difficult-to-cut materials is carried out based on research status of nanofluids MQL. Surface roughness R_a, autocorrelation analysis of contour curve and surface topography(SEM) are studied in research. Experimental results show that nanofluid MQL avoid burn phenomenon due to nanoparticles can significantly improve heat transfer of nanofluids. The MoS_2/CNT hybrid nanoparticles achieve lower surface roughness R_a value and grinding peak temperature than single nanoparticles because of "physical synergistic effect". Influenced by viscosity of nanofluids, surface roughness(R_a) increases gradually with the increase of mass fraction of nanofluid. Friction coefficient and grinding peak temperature, influenced by "agglomeration", decreases firstly and then increases with the increase of mass fraction of nanofluid, reaching the valley at 6%. According to the autocorrelation analysis, nanoparticle improves the grinding accuracy due to the "lubrication effect" and "micro-machining". It conclude that 6%, "agglomeration" phenomenon occurred concentration, MoS_2/CNTs is the optimum concentration for nanofluid MQL in the experiment.
An experimental research on effect of MoS_2/CNTs hybrid nanofluid minimum quantity lubrication(MQL) grinding on workpiece surface quality of difficult-to-cut materials is carried out based on research status of nanofluids MQL. Surface roughness R_a, autocorrelation analysis of contour curve and surface topography(SEM) are studied in research. Experimental results show that nanofluid MQL avoid burn phenomenon due to nanoparticles can significantly improve heat transfer of nanofluids. The MoS_2/CNT hybrid nanoparticles achieve lower surface roughness R_a value and grinding peak temperature than single nanoparticles because of "physical synergistic effect". Influenced by viscosity of nanofluids, surface roughness(R_a) increases gradually with the increase of mass fraction of nanofluid. Friction coefficient and grinding peak temperature, influenced by "agglomeration", decreases firstly and then increases with the increase of mass fraction of nanofluid, reaching the valley at 6%. According to the autocorrelation analysis, nanoparticle improves the grinding accuracy due to the "lubrication effect" and "micro-machining". It conclude that 6%, "agglomeration" phenomenon occurred concentration, MoS_2/CNTs is the optimum concentration for nanofluid MQL in the experiment.
引文
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[19]陈明君,李洪珠,李旦.碳纳米管力学行为研究的新进展[J].机械工程学报,2005,41(3):18-24.CHEN Mingjun,LI Hongzhu,LI Dan.New devepment of research in mechanical behaviors of carbon nanotubes[J].Chinese Journal of Mechanical Engineering,2005,41(3):18-24.
[20]ZHANG Y B,LI C H,JIA D Z,et al.Experimental evaluation of Mo S2 nano-particles in jet MQL grinding with different types of vegetable oil as base oil[J].Journal of Cleaner Production,2015,87:930-940.
[21]JIA D Z,LI C H,ZHANG D K,et al.Investigation into the formation mechanism and distribution characteristics of suspended microparticles in MQL grinding[J].Recent Patents on Mechanical Engineering,2014,7(1):52-62.
[2]DAI Chenwei,DING Wenfeng,XU Jiuhua,et al.Influence of grain wear on material removal behavior during grinding nickel-based superalloy with a single diamond grain[J].International Journal of Machine Tools&Manufacture,2017,113:49-58.
[3]RAHIM E A,SASAHARA H.An analysis of surface integrity when drilling inconel 718 using palm oil and synthetic ester under MQL condition[J],Machining Science and Technology,2011,15(1):76-90.
[4]MAO Cong,ZOU Hongfu,HUANG Yong,et al.Analysis of heat transfer coefficient on workpiece surface during minimum quantity lubricant grinding[J].The International Journal of Advanced Manufacturing Technology,2013,66(1):363-370.
[5]MAO C,TANG X,ZOU H,et al.Investigation of grinding characteristic using nanofluid minimum quantity lubrication[J].International Journal of Precision Engineering and Manufacturing,2012,13(10):1745-1752.
[6]JIA D Z,LI C H,ZHANG D K,et al.Experimental verification of nano-particle jet minimum quantity lubrication effectiveness in grinding[J].Journal of Nanoparticle Research,2014,16(12):1-15.
[7]YANG Yang,CHEN Zengyu,SONG Xuan,et al.Three dimensional printing of high dielectric capacitor using projection based stereolithography method[J].Nano Energy,2016,22:414-421.
[8]CHEN Zengyu,SONG Xuan,LEI Liwen,et al.3D printing of piezoelectric element for energy focusing and ultrasonic sensing[J].Nano Energy,2016,27:78-86.
[9]JIN T,STEPHENSON D J,XIE G Z,et al.Investigation on cooling efficiency of grinding fluids in deep grinding[J].CIRP Annals-Manufacturing Technology,2011,60(1):343-346.
[10]ZHANG Xianpeng,LI Changhe,ZHANG Yanbin,et al.Lubricating property of MQL grinding of Al2O3/Si C mixed nanofluid with different particle sizes and microtopography analysis by cross-correlation[J].Precision Engineering,2016,47:532-545.
[11]苏登成,陶文宏,王平,等.复合纳米润滑油添加剂的制备及其摩擦学性能[J].机械工程材料,2007,31(3):47-50.SU Dengcheng,TAO Wenhong,WANG Ping,et al.Preparation and tribological troperties of composite nano-particles as additive in lubrication oil[J].Materials for Mechanical Engineering,2007,31(3):47-50.
[12]焦大.Al2O3/Si O2复合纳米颗粒作为抗磨剂的性能研究[D].济南:济南大学,2011.JIAO Da.The Tribological properties research of Alumina/Silica composite nanoparticles as lubricant additives[D].Jinan:University of Jinan,2011.
[13]JIA Dongzhou,LI Changhe,ZHANG Yanbin,et al.Experimental research on the influence of the jet parameters of minimum quantity lubrication on the lubricating property of Ni-based alloy grinding[J].The International Journal of Advanced Manufacturing Technology,2016,82(1):617-630.
[14]SHEN B,SHIH A J.Minimum quantity lubrication(MQL)grinding using vitrified CBN wheels[J].Trans.NAMRI/SME,2009,37:129-136.
[15]ZHANG Yanbin,LI Changhe,JIA Dongzhou,et al.Experimental study on the effect of nanoparticle concentration on the lubricating property of nanofluids for MQL grinding of Ni-based alloy[J].Journal of Materials Processing Technology,2016,232:100-115.
[16]WANG Yaogang,LI Changhe,ZHANG Yanbin,et al.Experimental evaluation of the lubrication properties of the wheel/workpiece interface in MQL grinding with different nanofluids[J].Tribology International,2016,99:198-210.
[17]于洪方.镍基高温合金磨削烧伤机理[J].常州工业技术学院学报,1996,9(2):55-57.YU Hongfang.Grinding burn mechanism of nickel based alloy[J].Journal of Changzhou Industrial Technology College,1996,9(2):55-57
[18]罗军,王运动,蔡振兵,等.粘结Mo S2固体润滑涂层的转动微动磨损特性[J].机械工程学报,2012,48(17):100-105.LUO Jun,WANG Yundong,CAI Zhenbing,et al.Rotational fretting wear characteristics of bonded molybdenum disulfide solid lubrication coating[J],Journal of Mechanical Engineering,2012,48(17):100-105.
[19]陈明君,李洪珠,李旦.碳纳米管力学行为研究的新进展[J].机械工程学报,2005,41(3):18-24.CHEN Mingjun,LI Hongzhu,LI Dan.New devepment of research in mechanical behaviors of carbon nanotubes[J].Chinese Journal of Mechanical Engineering,2005,41(3):18-24.
[20]ZHANG Y B,LI C H,JIA D Z,et al.Experimental evaluation of Mo S2 nano-particles in jet MQL grinding with different types of vegetable oil as base oil[J].Journal of Cleaner Production,2015,87:930-940.
[21]JIA D Z,LI C H,ZHANG D K,et al.Investigation into the formation mechanism and distribution characteristics of suspended microparticles in MQL grinding[J].Recent Patents on Mechanical Engineering,2014,7(1):52-62.