摘要微量润滑切削技术(MQL)是一种重要的绿色切削技术，秉承绿色制造的理念在切削加工过程中无废气、废渣、废液的排放。在减小切削力，降低切削温度、提升润滑效果的同时还提高了已加工表面的表面质量。特别是在切削加工难加工材料时，更体现出微量润滑的独特优势。研究中所用的7055铝合金是一种难加工材料，采用传统加工方法时，会出现切削力过大、切削区域温度过高、刀具寿命极大缩短进而造成生产效率低、资源消耗大，限制了7055铝合金在此领域的应用和发展。本文采用MQL技术，试验仿真相结合，针对微量润滑条件下高速切削加工7055铝合金的切削力、切削温度进行了研究。首先，通过有限元分析软件准确构建7055铝合金高速切削加工过程动态物理仿真模型，对刀具应力场和温度场的三维数值模拟计算。得到微量润滑条件下高速切削7055铝合金的刀具的应力场和温度场分布。其次，在干式与低温微量润滑两种不同环境下，采用不同切削参数进行高速切削7055铝合金的单因素切削试验，分别测量两种不同切削环境下的切削力，同时测量切削区域的温度。深入分析微量润滑在高速切削7055铝合金加工中的减摩效果，得到微量润滑环境下切削力、切削温度与各切削参数的变化规律。最后，应用遗传算法建立多目标优化模型，根据约束条件得到最优的切削参数，从而为实际生产加工提供参考。关键词：微量润滑；7055铝合金；切削加工；有限元仿真ABSTRACTMicrolubricationcuttingtechnology(MQL)isanimportantgreencuttingtechnology.Adheringtotheconceptofgreenmanufacturing,thereisnoexhaustgas,wasteresidueandwasteliquidemissionduringcuttingprocess.Italsoimprovesthesurfacequalityofthemachinedsurfacewhilereducingthecuttingforce,reducingthecuttingtemperatureandimprovingthelubricationeffect.Especiallyintheprocessofmachininghardmaterials,theuniqueadvantagesofmicrolubricationarealsoshown.7055AluminumAlloyusedinthestudyisakindofdifficulttomachiningmaterials,usingthetraditionalprocessingmethod,therewillbeexcessivecuttingforce,cuttingtemperature,toollifegreatlyshortentheregionalhighresultinginlowproductionefficiency,highresourceconsumption,limitedto7055AluminumAlloyinthisfieldshouldbeusedanddevelopment.BasedonMQLtechnologyandexperimentalsimulation,thecuttingforceandcuttingtemperatureof7055aluminumalloyunderhighspeedcuttingundermicrolubricationarestudied.First,thedynamicphysicalsimulationmodelof7055aluminumalloyhigh-speedcuttingprocessisaccuratelyconstructedbythefiniteelementanalysissoftware,andthethree-dimensionalnumericalsimulationofthestressandtemperaturefieldofthecuttingtooliscarriedout.Thedistributionofthestressfieldandtemperaturefieldofthecuttingtoolofhighspeedcutting7055aluminumalloyundertheconditionofmicrolubricationisobtained.Secondly,underthetwodifferentenvironmentsofdryandlowtemperaturemicrolubrication,thesinglefactorcuttingexperimentsofhighspeedcutting7055aluminumalloywithdifferentcuttingparametersarecarriedout.Thecuttingforceoftwodifferentcuttingenvironmentsismeasured,andthetemperatureofcuttingareaismeasuredatthesametime.Thefrictionreductioneffectofmicrolubricationinhighspeedmachiningof7055aluminumalloyisanalyzed,andthechangeruleofcuttingforce,cuttingtemperatureandcuttingparametersinmicrolubricationenvironmentisobtained.Finally,thegeneticalgorithmisusedtoestablishthemulti-objectiveoptimizationmodel,andtheoptimalcuttingparametersareobtainedaccordingtotheconstraints,thusprovidingareferencefortheactualproductionandprocessing.Keywords:Micro-lubrication;7055aluminumalloy;cutting;finiteelementsimulation目录摘要..............................................................................................................
