课程设计定稿

太湖学院课程设计（论文）CA6140杠杆加工工艺及夹具设计学生姓名：钱益学生学号：0823147院（系）：机电系年级专业：机械84指导教师：韩邦华副教授二〇一一年十月太湖学院课程设计摘要I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，夹紧太湖学院课程设计ABSTRACTIIABSTRACTThispaperistodesignthecraftprocessesofmakingtheCA6140leversparepartsandsomespecializedtongsintheprocess.TheCA6140leversparepartprimarilyprocessesthesurfaceandbores.Generallyspeaking,toguaranteetheaccuracyoftheflatsurfaceprocessiseasierthanthatofthebore.Therefore,thisdesignfollowstheprinciplethatsurfacefirstandthenthebore,anddefinitelydividestheprocessofflatsurfaceandboreintocoarseprocessesandpreciseprocessestoguaranteetheboreprocesses.Thebasicchoiceistoconsider45outsidecircleasroughbasisandtoconsider25boreanditsnextsurfaceasprecisebasis.Thebottomisfirstprocessedouttobefixedpositionbasis,andprocesstheboreusingthebottomastheprecisebasis.Thewholeprocesseschoosethemachinebed.Intheaspectsoftongschoosing,specializedtongsareused.Inconsiderationofthesimpleconstructionsizeofthespareparts,clippingbyhandsisadopted.Itissimple,andtheorganizationdesignissimple,andcansatisfythedesignrequest.KeyWordsLeverspareparts,craftproces,tongs,fixedposition,tightclip太湖学院课程设计目录1摘要.............................................................................................................ⅠABSTRSCT.......................................................................................................Ⅱ1前言...........................................................................................................11.1课题背景及发展趋势........................................................................11.2夹具的基本结构及设计内容..........................................................12杠杆加工工艺规程设计...........................................................................32.1零件的分析........................................................................................32.1.1零件的作用..............................................................................32.1.2零件的工艺分析......................................................................32.2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.......42.2.1确定毛坯的制造形式..............................................................42.2.2基面的选择..............................................................................42.2.3确定工艺路线..........................................................................42.2.4机械加工余量、工序尺寸及毛坯尺寸的确定......................52.2.5确定切削用量..........................................................................62.2.6确定基本工时........................................................................172.3小结..................................................................................................283专用夹具设计.........................................................................................293.1加工工艺孔Φ25夹具设计............................................................293.1.1定位基准的选择....................................................................293.1.2切削力的计算与夹紧力分析................................................303.1.3夹紧元件及动力装置确定....................................................313.1.4钻套、衬套、钻模板及夹具体设计....................................313.1.5夹具精度分析........................................................................273.1.6夹具设计及操作的简要说明................................................273.2粗精铣宽度为30mm的下平台夹具设计.......................................283.2.1定位基准的选择....................................................................283.2.2定位元件的设计....................................................................283.2.3定位误差分析........................................................................293.2.4铣削力与夹紧力计算............................................................293.2.5夹具体槽形与对刀装置设计................................................303.2.6夹紧装置及夹具体设计........................................................40太湖学院课程设计目录23.2.7夹具设计及操作的简要说明................................................413.3钻M8螺纹孔夹具设计....................................................................413.3.1定位基准的选择....................................................................413.3.2定位元件的设计....................................................................413.3.3定位误差分析........................................................................423.3.4钻削力与夹紧力的计算........................................................433.3.5钻套、衬套、钻模板及夹具体设计....................................433.3.6夹紧装置的设计....................................................................383.3.7夹具设计及操作的简要说明................................................383.4小结..................................................................................................394参考文献....................................................................................................40太湖学院课程设计1绪论11前言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。机床夹具已成为机械加工中的重要装备。机床夹具的设计和使用是促进生产发展的重要工艺措施之一。