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缸盖加工转台夹具设计毕业论文.doc

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缸盖加工转台夹具设计毕业论文.doc

I摘要组合机床是随着生产力发展,由万能机床和专用机床发展而来的。组合机床是根据工件加工需要,以大量通用部件为基础,配以少量专用部件组成的一种高效专用机床。组合机床应用越来越普遍,并显示出其巨大的优越性。具体表现在自动化程度高,加工精度高,加工质量稳定,还能减轻工人的劳动强度等等。这次设计的是完成对缸盖上轴孔系的加工,如果采用通用机床加工不能使工序集中,同时会费时、费力,而且不利于保证其孔的加工精度。而组合机床可以进行多刀加工,能使工序集中,使加工简化,同时也能保证要求的加工精度,能一次装夹两个工件完成六个孔的加工。本设计的是机床总体设计和夹具设计,主要完成工序图、加工示意图、编制生产率计算卡以及夹具装配图和部分零件图。并且这种机床结构简单、生产效率高,符合生产实际的需要。通过对该机床的设计,主要了解组合机床的基本原理,体验组合机床的设计过程,掌握设计方法,并培养自己的设计思想,为就业打下坚实的基础。关键词组合机床,夹具,工序图,夹具设计IIAbstractThecombinedlathedevelopsfromtheallpurposemachinetoolandthespecialmachinetoolwiththedevelopmentofproductionforces.Itisakindofhighefficiencyspecialmachinetools,whichaccordingtotheprocessneedofworkpiece,onthebasisofalargenumbergeneralpurposepartsequippedwithafewspecialparts.Thecombinedlatheismadeusemoregeneral,Displayingconcretelyintheautomaticdegreehigh,themachiningaccuracyishigh,processingqualityissteady,stillcanlightenlaborintensity,etc.Thedesigniscompleteontheaxiscylinderheadmachiningholes.Ifadoptedgeneralpurposemachinenotonlymakeprocesstobecentralized,atthesametimehavebeentimeconsumingandstrenuousity,butalsodonotbenefittoguaranteethemachiningaccuraciesofhole.Whereasthecombinedlathecanproceedmultitoolprocess,getprocesscentralizedandgetprocesssimplify,alongwithguaranteemachiningaccuracythatrequire,completeprocessofsixholesonce.thedesignmissionisaoveralldesignandjigdesignofthecombinedlathe,mostlycompletethedesignofthedrawingofworkingprocedureandtheprocessingschematic,themachinetoolsgeneraldrawing,thecalculatingcardofproductivityandjigassembledrawingandpartofpartsdrawing.themachinetoolstructuresimplicityandhighofproductionefficiency,fitfordemandofactualproduce.ThroughthedesignIhaveunderstoodtherationaleofcombinedlatheanddesignmethodofthecombinedlatheandeducateddesignhabits.Thatisasolidfoundationforouremployment.KeywordsThecombinedlatheprocesspicturesheetoveralldesignofmachinetoolIII目录1绪论.............................................................................................................................................11.1我国夹具发展现状..............................................................................................................12零件的工艺性分析.....................................................................................................................22.1零件的作用...........................................................................................................................22.2零件的毛坯制造方式...........................................................................................................22.3零件的工艺分析...................................................................................................................23加工工件应选用的机床类型及该机床的特点.........................................................................33.1加工工件应选用的机床类型...............................................................................................33.1.1多工件组合机床的定义............................................................................................33.2组合机床的特点...................................................................................................................33.3组合机床设计步骤...............................................................................................................44夹具设计.....................................................................................................................................54.1概述.......................................................................................................................................54.1.1夹具的定义.................................................................................................................54.1.2组合机床夹具的定义.................................................................................................54.1.3组合机床夹具的作用.................................................................................................54.1.4组合机床夹具的组成和基本要求.............................................................................64.2定位方案的设计....................................................................................................................64.2.1定位方案的确定.........................................................................................................64.2.2工件定位误差及产生原因.........................................................................................74.2.3定位销的设计步骤及定位误差的计算.....................................................................74.3组合机床夹紧机构的设计及夹紧力的计算........................................................................94.3.1夹紧力的概念.............................................................................................................94.3.2设计夹紧机构时应注意满足的基本要求.................................................................94.3.3选择夹紧力的作用点时的注意事项.........................................................................94.3.4夹紧力的方向的选择...............................................................................................104.3.5夹紧力的大小确定...................................................................................................104.3.6确定夹紧力时应当注意的问题...............................................................................104.3.7夹紧机构的设计.......................................................................................................124.3.8油缸参数的计算.......................................................................................................144.4导向装置.................................................................................................................................153.4.1导向装置的概述.......................................................................................................154.5夹具体设计.............................................................................................................................164.5.1概述...........................................................................................................................164.5.2夹具体毛坯结构的选择...........................................................................................16结论.......................................................................17致谢...............................................................................................................................................18IV参考文献.......................................................................................................................................19附录...............................................................................................................................................20附录............................................................................................................................................20

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