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曲轴零件工艺规程及工装设计论文[带图纸].doc

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曲轴零件工艺规程及工装设计论文[带图纸].doc

西安文理学院机械电子工程系本科毕业设计(论文)题目曲轴零件工艺规程及工装设计专业班级08级机电(2)班学号08102080243学生姓名胡阿敏指导教师赵竹青设计所在单位西安文理学院2012年5月第1页曲轴零件工艺规程及工装设计摘要曲轴是汽车发动机的关键零件之一,其性能好坏直接影响到汽车发动机的质量和寿命,因此要求曲轴材质具有较高的刚性、疲劳强度和良好的耐磨性能。本课题研究的是曲轴零件的加工工艺过程,对曲轴的机械加工工艺的分析与设计进行探讨。工艺路线的拟定是工艺规程制订中的关键阶段,是工艺规程制订的总体设计。所撰写的工艺路线合理与否,对加工质量和生产率有重要的意义。所以,本设计是根据被加工曲轴的技术要求,进行机械工艺规程设计,然后运用夹具设计的基本原理和方法,拟定夹具设计方案,完成夹具结构设计。主要工作有绘制产品零件图,了解零件的结构特点和技术要求拟定零件的机械加工工艺过程,选择各工序的加工设备和工艺设备填写机械加工工艺过程卡片,绘制夹具装配总图和零件图等。关键词发动机曲轴工艺分析工艺设计第2页TheProcessofOrderandToolingDesignofCrankshaftAbstractThecarenginecrankshaftisoneofthekeypartsanditsdirectinfluenceontheperformanceofthequalityoflifeandthecarenginecrankshaftinengine.Sothecrankshaftmaterialwearhighrigidity,fatiguestrengthandwearresistance.Thistopicisonlydieselenginecrankshaftprocessanalysisanddesignarediscussed.Theprocessrouteplanisthekeystageprocedureformulationofregulations,istheoveralldesignprocess.Whichroutereasonableornot,influenceprocessingqualityandproductivity,andaffectworker,equipment。Therefore,Thisdesignisonthebasisoftechnicalrequirementofthecrankshafttodesignthetechnologicalprocedure.Andthenusethefundamentalandmethodofthefixturedesigntofixthefixturedesignprogramme,andcompletethestructuralofthefixture.ThemainworkisPartsdrawing,understandthecharacteristicofstructureandtechnicalrequirementfixtheprocessingtechnicofthecrankshft,selectdeviceFixtheProcessingtechnologicalprocesscardDesignthespecialfixtureandplantheassemblingdrawingandmainpartsdrawing.Keywordsenginecrankshaftprocessanalysisandprocessdesign目录第1页目录第一章绪论...................................................................................................................................11.1曲轴工艺设计的研究状况及发展趋势.................................................................11.2选题的目的与意义................................................................................................11.3本课题主要讨论问题............................................................................................1第二章曲轴零件图的结构分析...............................................................................................22.1零件的结构分析.....................................................................................................22.1.1零件的功用........................................................................................................................22.1.2零件的结构特点与工艺性................................................................................................22.1.3主要加工表面及其技术要求............................................................................................22.2计算生产纲领,确定生产类型.............................................................................22.3零件毛坯的选择.....................................................................................................22.3.1零件的材料........................................................................................................................22.3.2零件的毛坯及其制造........................................................................................................3第三章机械加工工艺规程的制定..........................................................................................43.1曲轴的机械加工工艺分析.....................................................................................43.2机械加工余量、工序尺寸及公差的确定.............................................................43.3确定工时定额.........................................................................................................53.4曲轴主要加工工序分析.........................................................................................53.4.1铣曲轴两端面,钻中心孔..................................................................................................63.4.2曲轴主轴颈的车削............................................................................................................63.4.3曲轴连杆轴颈的车削........................................................................................................63.4.4键槽加工............................................................................................................................63.4.5轴颈的磨削........................................................................................................................63.5曲轴机械加工工艺过程卡及工序简图.................................................................73.5.1三拐曲轴零件示意图........................................................................................................73.5.2三拐曲轴机械加工工艺过程卡........................................................................................93.5.3三拐曲轴机械加工工序安排..........................................................................................10第四章夹具设计..........................................................................................................................134.1机床夹具的分类、基本组成和功用...................................................................134.2普通夹具装夹偏心曲轴方法...............................................................................134.2.1夹具为三爪卡盘..............................................................................................................134.2.2夹具为四爪卡盘..............................................................................................................144.2.3用两顶尖车削偏心工件..................................................................................................154.3专用夹具的设计思路...........................................................................................154.4夹具体设计...........................................................................................................164.4.1定位基准的选择..............................................................................................................164.4.2切削力及夹紧力的计算..................................................................................................164.4.3定位误差分析..................................................................................................................184.4.4夹具结构设计..................................................................................................................194.4.5夹具的使用方法..............................................................................................................20结术语..................................................................................................................................................21致谢..................................................................................................................................................22目录第2页参考文献.............................................................................................................................................23

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