摘要:
建立了Al2O3陶瓷引弧微爆炸加工(micro-detonationofstrikingarcmachining,MDSAM)过程的
传热模型,基于有限元理论,利用ANSYS软件对加工过程中的温度场分布进行了模拟。结合材料性质,对模
拟和实验得到的蚀坑尺寸进行了比较,并分析了加工参数对温度场的影响。模拟结果表明,Al2O3陶瓷引弧
微爆炸加工时在给定的加工参数下的最高温度可达13435℃,且高温影响区范围很小,加工实验与模拟结果
符合较好。随着脉冲宽度和工作电流的增加,加工区域的温度以及蚀坑的半径和深度增大;随着喷嘴半径的
增大,加工区域的温度降低而蚀坑的径深比增大。模拟结果可为Al2O3 陶瓷引弧微爆炸加工过程中表面形
貌的预测、材料去除机理的揭示以及加工参数的选择等提供参考。
Abstract:
AthermaltransfermodelforAl2O3ceramicsduringmicro-detonationofstrikingarcmachining(
MDSAM)wasestablished.Basedonthefiniteelementtheory,thetemperaturefieldofAl2O3
ceramicsduringMDSAM wassimulatedwiththeaidoftheANSYSsoftware.Combinedwiththematerialproperties,
thesimulatedcavitydimensionwascomparedwiththemachiningexperimentalresultandtheeffectsofthemachiningparametersonthetemperaturef
eldwereanalyzed.ThesimulatedresultsshowthatthehighesttemperatureofAl2O3ceramicsduringMDSAMcanreach13435℃
withthegivenmachiningparameters.Theheat-affectedzoneisquitesmallandthemachiningtestis
consistentwiththesimulatedresults.Withtheincreaseofthepulsewidthandtheworkingcurrent,
thetemperatureoftheprocessingregionandtheradiusanddepthofthecavityincrease.Thetemperaturedecreaseswiththeincreaseofthenozzleradius,
whereasthediameter-to-depthratioofthecavity
increases.Thesimulatedresultscanprovideanimportantreferenceforthepredictionofthesurface
topography,thedisclosureofthematerialremovalmechanism,andtheoptimizationofthemachining
parametersforAl2O3ceramicsduringMDSAM.
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