零件的工艺编制是否合理，直接关系到零件的加工能否达到质量要求；合理的工艺编制就能使各工序科学地衔接，实现优质、高产低消耗，使生产均衡、顺利地进行。同时，机床夹具在机械制造中也占有重要的地位，合理的夹具设计能可靠地保证工件的加工质量，提高加工效率，减轻劳动强度，充分发挥和扩大机床的工艺性能。可见这两者在机械制造行业中是至关重要的环节。本次设计的是减速箱箱体上100孔的加工工艺及夹具设计，该孔精度要求较高，采有用镗床加工。在编制加工工艺时，要考虑到孔的各项精度以及形状与位置公差等。在设计加工100孔的专用夹具时，以箱座底面为基准，采用一面两销定位，通过连接螺栓将箱盖和箱座联结，并以定位销将其定位。为了降低成本、减少装夹时间，采用凸轮联动夹紧装置。逆时针转动手柄时，在拉伸弹簧的作用下，压板松开，放入工件，顺时针转动手柄带动凸轮推动推杆，从而压紧工件。关键词：工艺；夹具；定位；位置公差ABSTRACTThepreparationofpartsoftheprocessisreasonable,directlyrelatedtothemachiningqualityrequirementscanbemet;reasonablepreparationprocesswillenabletheconvergenceofscientificprocessestoachievehigh-quality,high-yieldlow,sothattheproductionofabalanced,smoothly.Atthesametime,inthemachinerymanufacturingfixturealsooccupyanimportantposition,reasonableandreliablefixturedesigncanguaranteethequalityoftheworkpieceprocessing,improveprocessingefficiency,reducelaborintensityandgivefullplaytothetechnologyandtheexpansionofmachinetoolperformance.Canbeseenbothinthemachinerymanufacturingindustryisvitallink.Thedesignofthedecelerationboxboxholes100andfixturedesignprocess,theholesrequireahigherprecision,boringprocessmininguseful.Inthepreparationprocess,itisnecessarytotakeintoaccounttheporeshapeandlocationaccuracy,aswellastoleranceandsoon.Holeinthedesignofspecialprocessingfixture100whentheseatbottomtomebasedontheuseofatwo-pinposition,throughtheboltcoverandtheboxseattojoin,anditspositioningpins.Inordertoreducecosts,reducetheclampingtime,linkedtheuseofcamclamps.Handlecounter-clockwiserotation,intheroleofthetensilespring,theplatenreleaseintotheworkpiece,theprocessinghasbeencompleted,turningthehandleclockwisetopromoteputtcamdriven,thuscompactingtheworkpiece.Keywords:Technology;fixture;positioning;positiontoleranceparts目录摘要…ⅠABSTRACTⅡ第一章绪论11.1课题研究的目的及内容1第二章零件的工艺分析22.1零件的作用22.3零件生产类型的确定3第三章零件的工艺规程设计43.1确定毛坯的制造形式43.2确定机械加工余量及毛坯尺寸43.3定位基准的选择63.4零件表面加工方法的选择73.5制订工艺路线93.6工序设计123.7确定切削用量及基本工时14第四章专用夹具设计234.1问题的提出234.2定位方案及定位元件的选择234.3夹紧方案及夹紧元件的选择254.4夹具体的选择274.5自锁条件的计算