摘要本设计是CA6140车床杠杆零件的加工工艺规程及一些工序的专用夹具设计。CA6140车床杠杆零件的主要加工表面是平面和孔。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和平面的加工精度。基准的选择以杠杆45外圆面作为粗基准，以25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。整个加工过程选用专用夹具，考虑到零件的结构尺寸简单，加紧方式多采用手动加紧，加紧简单，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，加紧图A：零件三维效果图AbstractThispaperistodesignthecraftprocessesofmakingtheCA6140leversparepartsandsomespecializedtongsintheprocess.TheCA6140leversparepartprimarilyprocessesthesurfaceandbores.Generallyspeaking,toguaranteetheaccuracyoftheflatsurfaceprocessiseasierthanthatofthebore.Therefore,thisdesignfollowstheprinciplethatsurfacefirstandthenthebore,anddefinitelydividestheprocessofflatsurfaceandboreintocoarseprocessesandpreciseprocessestoguaranteetheboreprocess.Thebasicchoiceistoconsider45outsidecircleasroughbasisandtoconsider25boreanditsnextsurfaceasprecisebasis.Thebottomisfirstprocessedouttobefixedpositionbasis,andprocesstheboreusingthebottomastheprecisebasis.Inthewholeprocesses,specializedtongsareused.Inconsiderationofthesimpleconstructionsizeofthespareparts,clippingbyhandsisadopted.Itissimple,andtheorganizationissimple,andcansatisfythedesignrequest.KeyWords:Leverspareparts,craftprocess,tongs,fixedposition,tightclip目录摘要..........................................................................IABSTRACT...............................................................II目录.......................................................................Ⅲ第一章绪论.............................................................11.1课题背景及发展趋势..........................................................................................11.2夹具的基本结构及夹具设计的内容.......................................................................1第二章杠杆加工工艺规程设计.....................................32.1零件的作用.......................................................................................................32.2零件的工艺分析................................................................................................42.3工艺规程的设计................................................................................................42.4机械加工余量、工序尺寸及毛坯尺寸、工时的确定..................................................7第三章专用夹具设计................................................273.1加工Ø25孔夹具设计.......................................................................................273.2粗、精铣宽度为30MM的下平台夹具设计............................................................31总结.......................................................................37参考文献................................................................38致谢.......................................................................39附件一...................................................................40附件二...................................................................58第一章绪论加工工艺及夹具毕业设计是对所学专业知识的一次巩固，是在进行社会实践之前对所学各课程的一次深入的综合性的总复习，也是理论联系实际的训练。机床夹具已成...
