CA6140杠杆的加工工艺及夹具设计摘要本设计是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ABSTRACTThispaperistodesignthecraftprocessesofmakingtheCA6140leversparepartsandsomespecializedtongsintheprocess.TheCA6140leversparepartprimarilyprocessesthesurfaceandbores.Generallyspeaking,toguaranteetheaccuracyoftheflatsurfaceprocessiseasierthanthatofthebore.Therefore,thisdesignfollowstheprinciplethatsurfacefirstandthenthebore,anddefinitelydividestheprocessofflatsurfaceandboreintocoarseprocessesandpreciseprocessestoguaranteetheboreprocesses.Thebasicchoiceistoconsider45outsidecircleasroughbasisandtoconsider25boreanditsnextsurfaceasprecisebasis.Thebottomisfirstprocessedouttobefixedpositionbasis,andprocesstheboreusingthebottomastheprecisebasis.Thewholeprocesseschoosethemachinebed.Intheaspectsoftongschoosing,specializedtongsareused.Inconsiderationofthesimpleconstructionsizeofthespareparts,clippingbyhandsisadopted.Itissimple,andtheorganizationdesignissimple,andcansatisfythedesignrequest.KeyWordsLeverspareparts,craftproces,tongs,fixedposition,tightclipTOC\o"1-3"\h\z\uHYPERLINK\l"_Toc170300070"摘要ⅠHYPERLINK\l"_Toc170300071"ABSTRSCTⅡHYPERLINK\l"_Toc170300072"1绪论1HYPERLINK\l"_Toc170300073"1.1课题背景及发展趋势1HYPERLINK\l"_Toc170300076"1.2夹具的基本结构及设计内容1HYPERLINK\l"_Toc170300077"2杠杆加工工艺规程设计3HYPERLINK\l"_Toc170300078"2.1零件的分析3HYPERLINK\l"_Toc170300079"2.1.1零件的作用3HYPERLINK\l"_Toc170300080"2.1.2零件的工艺分析3HYPERLINK\l"_Toc170300081"2.2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4HYPERLINK\l"_Toc170300082"2.2.1确定毛坯的制造形式4HYPERLINK\l"_Toc170300083"2.2.2基面的选择4HYPERLINK\l"_Toc170300084"2.2.3确定工艺路线4HYPERLINK\l"_Toc170300085"2.2.4机械加工余量、工序尺寸及毛坯尺寸的确定5HYPERLINK\l"_Toc170300086"2.2.5确定切削用量6HYPE