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毕业设计（论文）题目：R180柴油机曲轴工艺设计及夹具设计（英文）：R180dieselenginecrankshaftprocessdesignandfixturedesign院别：机电学院专业：机械设计制造及其自动化（师范）姓名：钱水德学号：2008094644030指导教师：郑振兴日期：2013年5月R180柴油机曲轴工艺设计及夹具设计摘要本次毕业设计是关于R180柴油机曲轴的工艺设计及其中两道工序的夹具设计。曲轴是柴油机中的关键零件之一，其材质大体分为两类：一是钢锻曲轴，二是球墨铸铁曲轴。曲轴关键技术是整个产业最关心的问题之一。曲轴是发动机中承受冲击载荷、传递动力的重要零件，在发动机五大件中最难以保证加工质量。由于曲轴工作条件恶劣，因此对曲轴材质以及毛坯加工技术、精度、表面粗糙度、热处理和表面强化、动平衡等要求都十分严格。本设计结合AutoCAD，绘出相应零件图，查找资料设计可取的工艺路线，并选取了加工工艺完善也比较精密和经济的作为方案。夹具设计的思路是：①明确设计任务，收集设计资料；②拟订夹具的结构方案、绘制结构草图；③绘制夹具总装图。绘制夹具总装图的顺序和方法：①用双点化线或红色笔绘出工件的轮廓外形和主要表面，并用网纹线表示出加工余量；②视工件轮廓为透明体，分别绘出定位、导向、夹紧及其他元件或装置，最后绘制夹具体，形成一个夹具整体；③标注尺寸、公差与配合和技术要求；④对零件进行编号，填写零件明细栏和标题栏；⑤绘制夹具零件图。关键词：曲轴；球墨铸铁；工艺路线；夹具R180dieselenginecrankshaftprocessdesignandfixturedesignABSTRACTThegraduationdesignisaboutR180dieselenginecrankshaftprocessdesignanditstwoprocesstofixturedesign.Crankshaftisoneofthekeypartsofdieselengine,thematerialcanbedividedintotwocategories:oneisforgedsteelcrankshaft,2itisductileironcrankshaft.Thecrankshaftkeytechnologyisoneofthemostconcernofthewholeindustry.Isenginecrankshaftunderimpactload,thepoweroftheimportantpartsoftheenginefivebigoneofthemostdifficulttoguaranteemachiningquality.Becausecrankshaftworkingconditions,materialforcrankshaftblankandprocessingtechnology,precision,surfaceroughness,heattreatmentandsurfacestrengtheningisverystrict,dynamicbalance,etc.ThisdesignbasedonAutoCAD,drawthecorrespondingpartdrawinganddesigndesirableprocessroutefindingoutinformation,andselecttheprocessingcraftismorepreciseandtheeconomyasasolution.Fixturedesigntrainofthoughtis:(1)cleardesigntask,designinformationcollection;2)toformulatethefixturestructurescheme,thestructureofthedrawingsketch;(3)mapclampassembly.Mapfixtureassemblysequenceandmethods:(1)withdoubleattunementslineorredpenpaintingmajorsurfaceshapeandtheoutlineoftheworkpiece,withreticulatelinesshowingamachiningallowance;(2)accordingtotheworkpiececontourforwhitebody,drawpositioning,orientation,clampandothercomponents,ordevices,finallydrawconcrete,toformawholefixture;Dimension,toleranceandcooperation,and(3)thetechnicalrequirements;(4)thepartsnumber,fillinthepartsdetailedbarandtitlebar;5.Drawdetaildrawingswithclamp.Keywords：Thecrankshaft;Ductileiron;Processroute;fixture目录1绪论........................................................................................................................................................11.1曲轴的概念..............................................................................................................................11.2柴油机曲轴的制造技术........................................................................................................11.2.1曲轴材料........................................................................................................................21.2.2曲轴加工........................................................................................................................21.3论文结构...................................................................................................................................32R180柴油机曲轴工艺设计............................................................................................................52.1分析零件图..............................................................................................................................52.1.1零件的作用..................................................................................................................52.1.2零件的工艺分析.........................................................................................................52.2确定生产类型..........................................................................................................................52.3确定毛坯...................................................................................................................................52.3.1确定毛坯种类..............................................................................................................52.3.2确定铸件加工余量.....................................................................................................52.3.3绘制曲轴零件毛坯图................................................................................................62.4机械加工工艺过程设计.....................................................................................................62.4.1选择定位基准.............................................................................................................62.4.2选择表面加工方法.....................................................................................................62.4.3确定工艺过程方案.....................................................................................................72.5选择加工设备与工艺装备..................................................................................................92.5.1选择机床.......................................................................................................................92.5.2选择夹具.......................................................................................................................92.5.3选择刀具........................................