CA6140车床拔叉831008

攀枝花学院本科毕业设计（论文）目录1攀枝花学院本科毕业设计（论文）拨叉80-08的加工工艺及夹具设计学生姓名：肖洋学生学号：2000310621033院（系）：机电系工程学院年级专业：03级机制一班指导教师：卢宗彪副教授二〇〇七年六月攀枝花学院本科毕业设计（论文）目录2摘要本次设计是车床变速箱中拔叉零件的加工工艺规程及一些工序的专用夹具设计。此拔叉零件的结构较为复杂，其加工的地方主要是孔和平面。本设计先加工孔后加工面。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它们的加工精度。基准选择以拔叉右面的最大的平面作为粗基准，来加工中间的通孔，然后以此加工过的孔作为精基准。主要加工工序安排是先以中心孔定位加工出顶平面和右侧平面以及下面的大孔的两平面，再以中心孔定位加工出下端的大孔。加工时是用镗床镗孔。最后以这两个孔为基准，分别加工右侧的槽和顶面的螺纹底孔。整个加工过程选用了钻床、铣床和镗床。工件在机床上定位夹紧选用专用夹具，夹紧方式为手动夹紧，夹紧可靠，操作方便。因此生产效率较高，适用于大批量、流水线上加工。能够满足设计要求。关键词加工工艺，定位，夹紧，专用夹具]攀枝花学院本科毕业设计（论文）目录3ABSTRACTThisdesignisalathertobecomesoonanappropriationforinsidepullingoutforksparepartsprocessingcraftrulesdistanceandsomeworkprefacestongsdesign.Thispullouttheconstructionoftheforksparepartsthanforcomplicacy,itstheplacethatprocessisapeacefulinboreprimarily.Thisdesignprocessesafterprocessingfirstthebore.Processwithflatsurfacetheclearanddefinitedividingthelinetheborethecoarsenessprocessestoprocesswiththenicetythestagetoguaranteetheirprocesstheprecisedegree.Thebasischoicetopulloutroughbasisofconductandactionsofthebiggestflatsurfaceoftherightinfork,processtheinthecenteringeneralusebore,thenbeusedastheprecisebasiswiththeborethatprocessed.Processingprimarilyworkprefacearrangementisfirsttoprocessaflatsurfacewiththecenterborefixedpositionwiththerightsideflatsurfaceandbelowbigboreoftwoflatsurface,againwithcenterborethefixedpositionprocessesthebigborethatcarrydown.Whileprocessingistousetheboringmachineboringbore.Regardthesetwoboresasthebasisfinally,processtheright-handslotrespectivelywiththethreadbottomboreofthea.Wholeprocessestheprocesschosetousetothedrillmachine,millerwiththeboringmachine.Thetongschoosestousetheappropriationtongs,clippingtightwayastomovetocliptight,cliptightanddependable,operationconvenience.Thereforeproducetheefficiencyhigher,beapplicabletothelargequantitymeasures,theflowingwaterison-linetoprocess.Cansatisfythedesignrequest.KeywordsProcessthecraft，Fixedposition，Cliptight，Appropriationtongs攀枝花学院本科毕业设计（论文）目录4目录摘要...............................................................................................................................................ⅠAbstract...........................................................................................................................................Ⅱ1绪论.................................................................................................................................................11.1课题背景...............................................................................................................................11.2夹具的发展史.......................................................................................................................11.3小结.......................................................................................................................................22拨叉80-08的加工工艺规程设计..........................................................................................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确定生产类型.......................................................................................................................32.3确定毛坯...............................................................................................................................32.3.1确定毛坯种类..............................................................................................................32.3.2确定铸件加工余量及形状..........................................................................................32.3.3绘制铸件零件图..........................................................................................................42.4工艺规程设计.......................................................................................................................42.4.1选择定位基准..............................................................................................................42.4.2制定工艺路线..............................................................................................................42.4.3选择加工设备和工艺设备..........................................................................................62.4.4机械加工余量、工序尺寸及公差的确定..................................................................62.5确定切削用量及基本工时...................................................................................................82.5.1工序1：粗铣Φ25H7的两侧面.................................................................................82.5.2工序2：粗铣平下端面孔侧面的工艺凸台...............................................................92.5.3工序3：钻Φ25H7的通孔.........................................................................................92.5.4工序4：扩Φ25H7的通孔.......................................................................................112.5.5工序5：铰Φ25H7的通孔..