目录机械CA6140拨叉零件的加工工艺及夹具的设计....................1ABSTRACT...................................................2前言......................................................3一、设计的目的.............................................4二、零件的分析.............................................42.1零件的作用:.........................................42.2零件的工艺分析:....................................4三、工艺规程设计...........................................53.1确定毛坯的制造形成................................53.2基准的选择..........................................53.3制定工艺路线........................................53.4机械加工余量........................................63.5确定切削用量及基本工时..............................7四、夹具设计..............................................154.1.提出问题...........................................164.2.设计思想...........................................164.3、夹具设计..........................................164.3.1、定位分析.....................................174.3.2、切削力、夹紧力、切屑用量和切屑速度的计算.....174.3.3、夹具操作说明.................................19结论.....................................................20致谢.....................................................21参考文献..................................................22械加工工序卡片............................................23附录......................................................29机械CA6140拨叉零件的加工工艺及夹具的设计摘要CA6140车床拨叉它位于车床变速机构中主要起换档,和其他零件配合,在改变转速的时候承受轻微的载荷,所以加工时应该保证本零件的重要工作表面符合技术要求。对于零件而言,尽可能选择不加工表面作为粗基准。而对有若干个不加工表面的工件,则应以加工表面要求相对位置精度较高的不加工表面作粗基准。因此φ60孔端面与φ25H7孔垂直度公差为0.1mm,所以先把加工φ25孔的表面和孔精加工出来,再以它为精基准加工别的面,例如铣φ60孔和端面、铣槽等。同时,在设计夹具时候要考虑定位基准和加紧机构。在设计中长销限制4个自由支撑钉限制1个和侧板限制1个;螺母和心轴配合用来加紧零件,开口垫片可实现大批量和中批量的生产。关键词:定位元件,加紧机构,定为基准,自由度Topic:thedesignprocessandfixtureCA6140latheforkpartsABSTRACTCA6140latheforkwhichislocatedmainlyonshiftlathetransmissionmechanism,coordinationandotherparts,withstandslightloadwhenchangingthespeed,sotheprocessingshouldbeanimportantworktoguaranteethesurfaceofthepartsmeetthetechnicalrequirements.Forparts,asfaraspossibletochoosenotprocessingsurfaceasaroughbenchmark.Whiletheworkpieceseveralnotprocessingsurface,shouldbebasedonthemachinedsurfacerelativenotprocessingsurfacepositionwithhighprecisionforthebenchmarkcrude.Sothe60holesurfaceandtheverticalityofφ25H7toleranceis0.1mm,sotheprocessingsurfaceandholemachining25holes,andthenitsfinebaseforothersurfacemachining,suchasmillingφ60holeandendface,millingetc..Atthesametime,inthedesignoffixturetimetoconsiderpositioningandclampingmechanism.Inthedesignofthelongpinlimitof4degreesoffreedom,supportingnaillimit1andsidelimit1;nutsandmandrelwithusedtointensifyparts,openinggasketcanrealizebatchandbatchproduction.Keywords:positioningelementclampingmechanismasthebenchmarkoffreedKEYWORDS:settingelement,Clampingmechanism,Asabenchmark,freedegree前言通过机床工艺及夹具设计,汇总所学专业知识如一体(如《公差于配合》、《机械零件设计》、《金属切削机床》、《机械制造工艺》等)。让我们...