options-for-micro-holemaking微孔的加工方法大学毕业论文外文文献翻译及原文

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1、毕业设计（论文）外文文献翻译文献、资料中文题目：微孔的加工方法文献、资料英文题目：Optionsformicro-holemaking文献、资料来源：文献、资料发表（出版）日期：院（部）：专业：班級:姓名：学号：指导教师：翻译日期：2017.02.14外文原文Optionsformicro-holemakingAsinthemacroscale-machiningworld，holemakingisoneofthemost—ifnotthemost—frequentlyperformedoperationsformicromachining.Manyoptionsexistforh

2、owthoseholesarecreated.Eachhasitsadvantagesandlimitations，dependingontherequiredholediameteranddepth,workpiecematerialandequipmentrequirements.Thisarticlecoversholemakingwiththrough-coolantdrillsandthosewithoutcoolantholes，plungemilling，microdrillingusingsinkerEDMsandlaserdrilling.HelpfulHoles

3、Gettingcoolanttothedrilltipwhilethetooliscuttinghelpsreducetheamountofheatatthetool/workpieceinterfaceandevacuatechipsregardlessofholediameter.Butthrough-coolantcapabilityisespeciallyhelpfulwhendeep-holemicrodrillingbecausethetoolsaredelicateandpronetofailurewhenexperiencingrecuttingofchips，ch

4、ippackingandtoomuchexposuretocarbide’sworstenemy—heat.Whenapplyingfloodcoolant，thedrillitselfblocksaccesstothecuttingaction.“Somewhereabout3to5diametersdeep，thecoolanthastroublegettingdowntothetip，’’saidJeffDavis，vicepresidentofengineeringforHarveyToolCo.，Rowley,Mass.“Itbecomeswisetouseacoolan

5、t-feddrillatthatpoint.”Inaddition，floodcoolantcancausemoreharmthangoodwhenmicroholemaking.“Thepressurefromthefloodcoolantcansometimessnapfragiledrillsastheyenterthepart，”Davissaid.Thetoolmakeroffersalineofthrough-coolantdrillswithdiametersfrom0.039”to0.125’’thatareabletoproduceholesupto12diame

6、tersdeep，aswellasmicrodrillswithoutcoolantholesfrom0.002Mto0.020”.Havingthrough-coolantcapacityisn’tenough，though.Coolantneedstoflowataratethatenablesittoclearthechipsoutofthehole.Davisrecommends，ataminimum，600to800psiofcoolantpressure.“Itworksmuchbetterifyouhavehigherpressurethanthat，”headded

7、.Topreventthosetinycoolantholesfrombecomingcloggedwithdebris，Davisalsorecommendsa5(imorfinercoolantfilter.Anotherrecommendationistomachineapilot，orguide，holetopreventthetoolfromwanderingontopoftheworkpieceandaidinproducingastraighthole.