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学位论文I摘要毕业设计的课题基本分为三大类，即工艺工装设计类、组合机床设计类和计算机课题类。本课题所涉及的是第一类，设计任务为汽车后桥壳体的工艺工装设计，在壳体内部装有主传动器、差速器、半轴等传动机构。壳体起保证和支撑的作用，其主要加工表面为端面外圆、法兰平面、弹簧座平面、以及内孔等。本次设计主要包括工艺规程、夹具、刀具和量具的设计。此次设计共分三个阶段，即：（1）毕业实习阶段（2）课题设计阶段（3）考核答辩阶段。结合本次设计零件的特点，在设计中完成工艺规程一套，夹具两套：（1）铣床夹具（2）钻床夹具，其中，前者为手动夹紧。另外还据任务书分别设计刀具——铣刀一把和量具——单头双极限卡规一套，共完成图纸近5张，基本完成老师所交给的任务。关键词：汽车后桥；工艺分析；设计任务学位论文IIABSTRACTThesubjectofthegraduationprojectisdividedintothreebigclasses,namelythefrockdesigningtypeofcraft,makingupthedesigningtypeoflatheandcompersubjectsbasically.Whatthissubjectinvolvedisthefirstkind,designingthetaskfortherearaxleofautomobile,thecraftfrockoftheshellisdesigned.Equippedwiththeorganizationsofthetransmission,suchasmainhammermechanismactuator,differentialmechanism,semi-axis,ect,withintheshell.Theshellplaysaroleinguatanteeingandsupport,itprocessesflange,springseatplane,andinteriorholeroundforoutsideoftheterminalsurfaceofsurface,ect,mainly.Thisdesignincludesthedesignofrulesofcraft,jig,cutterandmeasuringtoolmainly.Thisdesigndividesthreestagesaltogether,namely:(1)Graduationfieldworkstage(2)Ddeignphaseofsubject(3)Examinethestageofreplying.Combinethischarateristicofdesigningthepart,finisshesonesetofrulesofcraftinthedesign,twosetsofjigs:(1)Jigofthemillingmachine(2)Thejigofthedrillingmachine,amongthem,theformer,inordertoclampmanually.Stilldesignthecuttersepatatelyaccordingtothetaskbookinaddition—Onemillingcutteriswithmeasuring,finishdrawingamountnearlu5altogether,finishthetaskthatateacherassignsbasically.Keyword:Therearaxleofautomobile；thecrafuanaluses；designsthetask学位论文III目录1绪论......................................................................................................................................11.1我国汽车后桥制造业的现状及其发展趋势............................................................11.2汽车后桥壳体的构造................................................................................................11.3汽车后桥壳体的性能要求........................................................................................12零件的分析..........................................................................................................................32.1零件的作用................................................................................................................32.2零件的工艺分析........................................................................................................32.3生产类型的确定........................................................................................................42.4确定毛坯的制造形式................................................................................................42.5基面的选择................................................................................................................43械加工工艺路线..................................................................................................................63.1工艺方案....................................................................................................................63.2工艺方案比较分析....................................................................................................73.3加工阶段的划分和检验工序的安排........................................................................74加工余量、工序、毛坯尺寸的确定..................................................................................95工时定额............................................................................................................................105.1工序六的工时定额.....................................................................................................105.2工序十三的工序定额.................................................................................................116夹具设计............................................................................................................................126.1铣床夹具设计..........................................................................................................126.1.1工件的加工工艺分析....................................................................................126.1.2定方案，设计定位元件................................................................................126.1.3确定夹紧方式和设计夹紧结构....................................................................136.1.4定位误差的分析............................................................................................146.1.5夹紧元件的强度校核....................................................................................146.1.6夹具体的设计................................................................................................156.1.7夹具体设计及其操作的简要说明................................................................156.2钻床夹具的设计......................................................................................................166.2.1定位基准的选择............................................................................................166.2.2夹紧力的确定................................................................................................166.2.3钻削力的计算................................................................................................166.2.4动力源设计.............................