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CA6140车床831007 拨叉零件数控加工工艺及工装设计毕业论文.doc

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CA6140车床831007 拨叉零件数控加工工艺及工装设计毕业论文.doc

1摘要本设计分析研究了CA6140车床变速箱中拔叉零件的夹具设计。由于拔叉零件的工序较多且结构较为复杂,所以为了保证加工精度和提高生产效率,考虑采用数控机床进行加工,以下内容进行了拨叉零件工艺性分析、加工顺序和工艺方案的确定,并通过对拨叉零件数控加工工艺规程设计和钻孔工序的夹具设计,为拨叉零件在数控机床上加工提供了理论依据和有力的硬件保证。关键词数控加工工艺,定位,夹紧,专用夹具2AbstractThedesignofthegearboxonthelatheisinCA640partsforkanddrillapointoforderprocessingΦ20,Φ50holeofthisspecialfixturedesignprocess.Forkpartsasaresultofthemorecomplexthestructure,processesmorethereforeinordertoensuretheaccuracyofprocessingtoincreaseproductivityandreducelaborintensity,considertheuseofCNCmachinetoolsforprocessingandpreparationoftheCNCmachiningprocess.InordertoensureΦ20,Φ50holeontheverticaldatumtolerance,CNCmachinetoolstomeettheprocessingrequirementsontheirdesignofaspecialfixture,thefixtureusingautomaticclampingdevice,clampingareliable,easytooperate.Higherproductionefficiency,therefore,applicabletohighvolume,theprocessingpipeline.Abletomeetthedesignrequirements.KeywordsNCmachiningprocess,positioning,clamping,specialfixture3目录摘要................................................................................................................................1Abstract..........................................................................................................................2目录............................................................................................................................31绪论............................................................................................................................52数控加工工艺概述....................................................................................................52.1数控加工工艺分析的一般步骤与方法.............................................................52.2机床的合理选用.................................................................................................52.3数控加工零件工艺性分析.................................................................................62.3.1零件图样上尺寸数据的给出应符合编程方便的原则..............................62.3.2零件各加工部位的结构工艺性应符合数控加工的特点..........................62.4加工方法的选择与加工方案的确定.................................................................62.4.1加工方法的选择..........................................................................................62.4.2加工方案确定的原则..................................................................................72.5工序与工步的划分及加工顺序安排.................................................................72.5.1工序的划分...................................................................................................72.5.2工步的划分..................................................................................................72.5.3加工顺序安排..............................................................................................82.6零件的安装与夹具的选择.................................................................................82.6.1定位安装的基本原则..................................................................................82.6.2选择夹具的基本原则..................................................................................82.7刀具的选择与切削用量的确定.........................................................................82.7.1刀具的选择..................................................................................................82.7.2切削用量的确定..........................................................................................92.8对刀点与换刀点的确定.....................................................................................92.9加工路线的确定.................................................................................................93拨叉零件数控加工工艺分析..................................................................................103.1拨叉零件的作用...............................................................................................103.2拨叉零件的工艺分析.......................................................................................103.3确定拨叉零件生产类型...................................................................................103.4确定拨叉零件毛坯类型...................................................................................113.4.1确定毛坯种类............................................................................................113.4.2确定铸件加工余量及形状........................................................................123.4.3绘制铸件零件图..........................................................错误未定义书签。3.5拨叉零件数控加工工艺规程设计...................................................................123.5.1选择定位基准............................................................................................123.5.2制定数控加工工艺路线............................................................................123.6机械加工余量、工序尺寸及公差的确定.......................................................133.6.1圆柱表面工序尺寸....................................................................................133.6.2平面工序尺寸............................................................................................143.6.3确定切削用量及时间定额........................................................................1444夹具设计..................................................................................................................234.1问题的提出.......................................................................................................234.2夹具设计...........................................................................................................234.2.1定位基准选择............................................................................................234.2.2切削力及夹紧力计算.................................................................................244.3定位误差分析....................................................................................................244.3.1定位元件尺寸及公差的确定.....................................................................244.3.2计算钻套中心线与工作台的垂直度误差.................................................244.3.3计算定位销轴与工作台的平行度误差.....................................................254.4夹具设计及操作的简要说明............................................................................255结束语.......................................................................................................................26致谢..............................................................................................................................27参考文献........................................................................................错误未定义书签。

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