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1、成都工业学院毕业设计（论文）设计（论文）题目：发动机曲轴工艺设计及钻中心孔夹具和钻斜油孔夹具设计系部名称：机电工程系专业：数控技术专业班级：09423学生姓名：学号：指导教师：I二O一二年五月摘要曲轴是发动机上的一个重要的旋转机件，装上连杆后，可承接活塞的上下(往复)运动变成循环运动。曲轴主要有两个重要加工部位：主轴颈和连杆颈。主轴颈被安装在缸体上，连杆颈与连杆大头孔连接，连杆小头孔与汽缸活塞连接，是一个典型的曲柄滑块机构。发动机工作过程就是：活塞经过混合压缩气的燃爆，推动活塞做直线运动，并通过连杆将力传给曲轴，
2、由曲轴将直线运动转变为旋转运动。而曲轴加工的好坏将直接影响着发动机整体性能的表现。曲轴的材料一般为35、40、45钢或球墨铸铁QT600-2，曲轴有两个重要部位：主轴颈，连杆颈。本次采用45钢，设计的主要就是这两方面的在数控机床的加工。集合多种的曲轴加工后，深入分析了曲轴的加工工艺。关键词：曲轴主轴劲夹具连杆劲数控加工IAbstractThecrankshaftisanimportantenginerotatingparts,fittedwithlinking,youcanundertakeupanddownth
3、episton(reciprocating)motionintocircularmotion.Thecrankshaftmaintwoimportantprocessingareas:themainjournalandrodneck.Spindlenecktobeinstalledonthecylinderblock,connectingrodjournalandconnectingrodholeconnection,connecttheconnectingrodsmallendholeandthecylinde
4、rpiston,isatypicalslider-crankmechanism.Engineworkingprocess:thepistonaftertheblastingofthemixedcompressedgaspushesthepistonlinearmotionandforcetothecrankshaftthroughtheconnectingrod,thelinearmotionintorotarymotionbythecrankshaft.Thecrankshaftprocessingwilldi
5、rectlyaffecttheoverallperformanceoftheengineperformance.Thematerialofthecrankshaftismadeofcarbonstructuralsteelorductileiron,therearetwoimportantareas:themainjournalrodneck.Thispaperintroducesthefixturedesignoftheenginecrankshaftprocessdesignofthetwoprocesses
6、.Ensureproductquality,increaseproductivity,reducecosts,makefulluseoftheexistingproductionconditionstoensureworkershavedesignedunderthepremiseofagoodandsafeworkingconditions.Inprocessdesign,theauthorcombinespracticaltheoryofdesign,traditionalcrankshaftproducti
7、onprocessimprovements,optimizingprocessesandprocessequipment,productionandprocessingmoreeconomicalandreasonablesothatthecrankshaft.Fixturedesignpartofthecollectionofprocessingmachinetools,cuttingtoolsandauxiliarytoolsandotherrelevantinformationusedbasedonthew
8、orkpiecematerial,structuralfeatures,technicalrequirementsandprocessanalysis,inaccordancewiththefixturedesignstepstodesignalinewiththecrankshaftproductionprocessandfixturemanufacturingrequ
