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毕业设计阀盖加工工艺规程及工装夹具设计摘要零件的加工工艺编制,在机械加工中占有非常重要的地位零件工艺编制得合不合理,这直接关系到零件最终能否达到质量要求,夹具的设计也是不可缺少的一部分,它关系到能否提高其加工效率的问题。因此这两者在机械加工行业中是至关重要的环节。阀盖零件的主要加工表面为孔和外圆表面。外圆表面加工根据精度要求可选择车削和磨削。孔加工方法的选择比较复杂,需要考虑零件的结构特点、孔径大小、长径比、精度和粗糙度要求以及生产规模等各种因素。对于精度要求较高的孔往往还要采用几种不同的方法顺次进行加工。在机床上对零件进行机械加工时,为保证工件加工精度,首先要保证工件在机床上占有正确的位置,然后通过夹紧机构使工件在正确位置上固定不动,这一任务就是由机床夹具完成。对于单件、小批量生产,应尽量使用通用夹具,这样可以降低工件的生产成本。但是由于通用夹具适用各种工件的装夹,所以夹,时往往比较费时间,并且操作复杂生产效率低,也难以保证加工精度,为此需设计专用夹具。通过该课程设计,将所学理论与生产实践相结合,锻炼了自己分析问题、解决问题的能力,在这个过程中我独立地分析和解决了零件机械制造的工艺问题,设计了机床专用夹具的典型结构,提高了结构设计能力,为今后的工作进行了一次适应性锻炼,从而为以后打下了坚实的基础。关键词:工艺设计;基准选择;切削用量;定位误差THEVALVECOVERPROCESSINGPROCEDUREANDFIXTUREDESIGNABSTRACTIsthecomponentscraftestablishment,holdstheveryimportantstatusinthemachine-finishing,theComponentscraftestablishesreasonable,whetherdothisdirectrelationcomponentsachievetheavailablequalityrequirementfinally;Jig'sdesignisalsoanessentialpart,whetherdoesitrelateraisesitsprocessingefficiencythequestion.Thereforethisbothinthemachine-finishingaretheimportantlinks.Sleevecomponentsmainprocessingsurfaceforholeandouterannulussurface.Theouterannulusfaceworkneedstorequestaccordingtotheprecisiontobepossibletochoosetheturningandthegrinding.Theholeprocessingmethod'schoiceisquitecomplex,needstoconsiderthecomponentstheuniquefeature,theaperturesize,thelengthtodiameterratio,theprecisionandroughnessrequestaswellasthescaleofproductionandsooneachkindoffactor.Ofthenmustuseseveraldifferentmethodsregardingtheaccuracyrequirementhighholetocarryontheprocessinginorder.Thisdesign'scylinder,willpassthroughhalffinishedboring,thefinishedboring,thefinearticulationandthetrundlesuccessivelyfortheguaranteehole'sprecisionandthesurfacequalitysuccessivelyfortheguaranteehole'sWhentheenginecarriesonthebedmachine-finishingtothecomponets,isguaranteedthattheworkpieceworkingaccuracy,firstneedstoguaranteetheworkpieceholdsthecorrectpositionontheenginebed,thencausestheworkpieceinthecorrectpositionthroughtheclamporganizationfixedmotionless,thisdutyiscompletesbytheenginebedjig.Regardingthesingleunit,thesmallbatchproduction,shouldusetheuniversaljigasfaraspossible,likethismayreducetheworkpiecetheproductioncost.Butbecausetheuniversaljigissuitableeachkindofworkpiecetheattiretoclamp,thereforetimeclampoftencomparesspendsthetimeandoperatescomplex,theproductionefficiencyislow,alsoguaranteestheworkingaccuracywithdifficulty,forthisreasonmustdesigntheunitclamp.Throughthecurriculumdesign,thetheoryandproductionpractice,exercisetheirabilitytoanalyzeandsolveproblems,inthisprocess,Iindependentlyanalyzeandsolvetheprocessproblemsofpartsinmachinerymanufacturing,designofthetypicalstructureofmachinetoolfixture,andimprovethedesignabilitystructure,Conductedanadaptivetrainingforfuturework,soastolayasolidfoundation.Keyword:Craft;datum;cutting;specifications;localization;datum,;positionerror目录1.绪论.................................................................................................................................61.1机床夹具在机械加工中的作用.............................................................................61.2机床夹具的分类....................................................................................................71.3机床夹具的组成.....................................................................................................81.4本设计的目的.........................................................................................................92.阀盖加工工艺规程设计.................................................................................................102.1零件的分析..........................................................................................................102.1.2零件的工艺分析........................................................................................102.1.3零件的生产类型........................................................................................112.2阀盖加工的主要问题和工艺过程设计..............................................................112.2.1确定毛坯的制造形式................................................................................112.2.2定位基准的选择........................................................................................122.2.3确定工艺路线............................................................................................132.2.4确定机械加工余量、工序尺寸及毛坯尺寸............................................152.2.5确定切削用量............................................................................................172.3小结......................................................................................................................243.专用夹具设计...............................................................................................................253.1对专用夹具的基本要求......................................................................................253.2夹具的设计..........................................................................................................263.2.1零件的加工工艺分析:............................................................................263.2.2定位加紧方案的确定及论证:................................................................263.3小结.......
本文标题:阀盖加工工艺规程及工装夹具
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