摘要本设计是CA6140杠杆零件的加工工艺规程及一些工序的专用夹具设计。CA6140杠杆零件的主要加工表面是平面及孔。一般来说，保证平面的加工精度要比保证孔的加工精度容易。因此，本设计遵循先面后孔的原则。并将孔与平面的加工明确划分成粗加工和精加工阶段以保证孔的加工精度。基准的选择以杠杆外圆面作为粗基准，以孔及其下表面作为精基准。先将底面加工出来，然后作为定位基准，在以底面作为精基准加工孔。整个加工过程选用组合机床。在夹具方面选用专用夹具。考虑到零件的结构尺寸简单，夹紧方式多采用手动夹紧，夹紧简单，机构设计简单，且能满足设计要求。关键词：杠杆零件，加工工艺，夹具，定位，夹紧Ca6140LeverageprocessingtechnologyandΦ25holedrillingoffixturedesignAbstractThispaperistodesignthecraftprocessesofmakingtheCA6140leversparepartsandsomespecializedtongsintheprocess.TheCA6140leversparepartprimarilyprocessesthesurfaceandbores.Generallyspeaking,toguaranteetheaccuracyoftheflatsurfaceprocessiseasierthanthatofthebore.Therefore,thisdesignfollowstheprinciplethatsurfacefirstandthenthebore,anddefinitelydividestheprocessofflatsurfaceandboreintocoarseprocessesandpreciseprocessestoguaranteetheboreprocesses.Thebasicchoiceistoconsider45outsidecircleasroughbasisandtoconsider25boreanditsnextsurfaceasprecisebasis.Thebottomisfirstprocessedouttobefixedpositionbasis,andprocesstheboreusingthebottomastheprecisebasis.Thewholeprocesseschoosethemachinebed.Intheaspectsoftongschoosing,specializedtongsareused.Inconsiderationofthesimpleconstructionsizeofthespareparts,clippingbyhandsisadopted.Itissimple,andtheorganizationdesignissimple,andcansatisfythedesignrequest.Keywords:Leverspareparts,craftproces,tongs,fixedposition,tightclip目录第一章前言……………………………………………………………………………...…...6加工工艺及夹具设计的发展…………………………………………………………...6发展状况…………………………………………………………………………..6发展趋势………………………………………………………………………………...6……………………………………………………………..6…………………………………………………………………..7评述……………………………………………………………………………...............8课题背景及发展趋势…………………………………………………………………...8夹具的基本结构及夹具设计的内容…………………………………………………..8第二章杠杆加工工艺规程设计……………………………………………...……………..10零件的分析………………………………………………………………………….10零件的作用……………………………………………………………………..…10零件的工艺分析…………………………………………………………….….…10杠杆加工的主要问题和工艺过程设计所应采取的相应措施…………………….11确定毛坯的制造形式…………………………………………………………..…11基面的选择…………………………………………………………………..……11确定工艺路线………………………………………………………………….…11机械加工余量、工序尺寸及毛坯尺寸的确定………………………………..…