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大学毕业设计说明书1CA6140车床拨叉摘要拨叉的加工质量将直接影响机器的性能和使用寿命。本次设计旨在提高CA6140车床拨叉的加工效率，由此我们首先对拨叉的结构特征和工艺进行了仔细的分析，然后确定了一套合理的加工方案，加工方案要求简单，操作方便，并能保证零件的加工质量。在制定加工工艺规程的顺序如下：1分析零件；2选择毛坯；3设计工艺规程：包括制定工艺路线，选择基准面等；4工序设计：包括选择机床，确定加工余量，工序尺寸及毛坯尺寸，确定切削用量及计算基本工时等；5编制工艺文件。此外，为了提高劳动生产率，降低劳动强度，保证加工质量，需设计专用夹具，本次设计选择了第六道工序铣断双体的专用夹具设计，以满足加工过程的需要。关键词：拨叉;工艺规程;夹具设计大学毕业设计说明书2AbstractDialstheforkprocessingqualitydirectlywillaffectthemachinetheperformanceandtheservicelife.ThisdesignisforthepurposeofenhancingtheCA6140LathemachineDialstheforktheprocessingefficiency,firsthascarriedonthecarefulanalysisfromthisustotheDialstheforkstructurecharacteristicandthecraft,thenhaddeterminedsetofreasonableprocessingsplans,theprocessingplanrequestaresimple,theeaseofoperation,andcanguaranteethecomponentstheprocessingquality.Informulationprocessingtechnologicalprocessorderasfollows:1analysisthecomponents;2choicessemifinishedmaterials;3designstechnologicalprocess:IncludingdivisionCraftroute,preferredorientationdatumandsoon;4workingproceduresdesigns:Includingchoosestheenginebed,thedeterminationprocessingremainder,thecomputationworkingproceduresizeanditstheSemifinishedmaterialssize,thedeterminationcuttingspecificationsandthecomputationman-hourandsoon;5establishmentstechnologicaldocument.Inaddition,inordertoenhancethelaborproductivity,reducesthelaborintensity,guaranteedtheprocessingquality,mustdesigntheunitclamp,thisdesignchosethesixworkingproceduretoThemillbreaksCatarmaranSpecial-purposejigdesign,bysatisfiedtheprocessingprocesstheneed.Keywords:Dialsthefork;technologicalprocess;jigdesin。大学毕业设计说明书3目录摘要··························································································································································1前言···························································································································································41零件的分析········································································································································51．1零件的作用····································································································································51．2零件的工艺分析····························································································································52工艺规程的设计·······························································································································62．1毛坯的制造形式····························································································································62．2基准面的选择································································································································62．2．1粗基准的选择······················································································································62．2．2精基准的选择······················································································································62．3制定工艺路线································································································································62．4机械加工余量、工序尺寸及毛坯尺寸的确定············································································8大学毕业设计说明书42．5确定切削用量及基本工时············································································································83绘制零件图和编制工艺卡············································································································263．1绘制零件图···································································································································263.2编制工艺文件·································································································································264夹具设计············································································································································284．1问题的提出·································································································································284．2夹具体设计·································································································································284．2．1定位基准的选择·················································································································284．2．2切削力及夹紧力的计算·····································································································284．2．3定位误差分析·····················································································································304．2．4夹具设计及操作的简要说明·····························································································305结论·····················································································································································326致谢·····················································································································································337参考文大学毕业设计说明书5献······························