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PROCEDIAENGINEERING29201214861491187770582011PUBLISHEDBYELSEVIERLTDDOI101016/JPROENG201201160AVAILABLEONLINEATWWWSCIENCEDIRECTCOMAVAILABLEONLINEATWWWSCIENCEDIRECTCOMPROCEDIAENGINEERING002011000000PROCEDIAENGINEERINGWWWELSEVIERCOM/LOCATE/PROCEDIA2012INTERNATIONALWORKSHOPONINFORMATIONANDELECTRONICSENGINEERINGIWIEEANINVESTIGATIONONTHEIMPACTNOISEOFASIXBARLINKAGEMECHANICALPRESSYANXINLUOA,RUXUDUBASTATEKEYLABOFMECHANICALTRANSMISSION,CHONGQINGUNIVERSITY,CHONGQING,400044,CHINABTHEINSTITUTEOFPRECISIONENGINEERING,THECHINESEUNIVERSITYOFHONGKONG,SHATIN,NT,HONGKONGABSTRACTCONVENTIONALMECHANICALPRESSCONSISTEDOFCRACKANDSLIDERISONEOFTHEMOSTCOMMONLYUSEDFORSTAMPINGBUTITCANNOTSATISFYDEEPDRAWINGOPERATIONS,INWHICHLONGDWELLINGTIMEINTHEBDCISDESIRABLETOAVOIDCRACKORWRINKLETHISMOTIVESTHEDESIGNOFASIXBARLINKAGEFORTHEMECHANICALPRESSHOWEVER,THEWORKINGNOISEISINTRODUCEDBYTHENEWMECHANISMTHISPAPERPRESENTSASYSTEMATICSSTUDYONTHENOISEOFTHEMECHANICALPRESSACOMBINATIONOFNOISESIGNATUREANALYSIS,RIGIDBODYDYNAMICSANALYSISANDFINITEELEMENTMETHODFEMAREADOPTEDTOINVESTIGATETHEROOTCAUSEOFTHENOISEITISFOUNDTHATTHENOISEISCAUSEDBYTHECOLLATIONOFTHEGEARSFINALLY,ANIMPROVEDDESIGNISTHENPROPOSEDANDSOMESUGGESTIONSAREGIVENTOREDUCETHENOISE2011PUBLISHEDBYELSEVIERLTDSELECTIONAND/ORPEERREVIEWUNDERRESPONSIBILITYOFHARBINUNIVERSITYOFSCIENCEANDTECHNOLOGYKEYWORDSSIXBARMECHANICALPRESS,SIGNATUREANALYSIS,IMPACTNOISE,FINITEELEMENTMETHODFEM1INTRODUCTIONCONVENTIONALMECHANICALPRESSCONSISTEDOFCRACKANDSLIDERISONEOFTHEMOSTCOMMONLYUSEDFORSTAMPINGITSTRAJECTORYISNOTCONTROLLABLEATTHEBOTTOMDEADCENTREBDC,ANDHENCEITCANNOTSATISFYTHEDIVERSENEEDS1FOREXAMPLE,LONGDWELLINGTIMEINTHEBDCISDESIRABLETOAVOIDCRACKORWRINKLEFORDEEPDRAWINGOPERATIONS2THISMOTIVESTHEDESIGNOFTHEFIVE,SIX,NINEBARLINKAGEFORTHECORRESPONDINGAUTHORTEL862365106999FAX862365105795EMAILADDRESSYXLUOCQUEDUCN1487YANXINLUOANDRUXUDU/PROCEDIAENGINEERING292012148614912YLUOANDRDU/PROCEDIAENGINEERING002011000000MECHANICALPRESS3,4INGENERAL,INTHEDESIGNOFAMECHANICALMETALFORMINGPRESS,DESIGNERSCONCERNMOSTLYTHEKINEMATICS5FEWHAVESTUDIEDTHEDYNAMICSOFTHEPRESS,THOUGHITISVERYIMPORTANTITSPERFORMANCE6WHENACOMMERCIALPRESSISDESIGNEDANDBUILT,ITSNECESSARYTOINVESTIGATEITSPERFORMANCEANDMAKECONTINUOUSIMPROVEMENTSINTHISRESEARCH,ASIXBARLINKAGEINCLUDINGAFOURBARLINKAGEANDACRANKSLIDERMECHANISMHASBEENADOPTEDTOBUILDACOMMERCIALMECHANICALPRESSWITHTHECAPABILITYOFMAXLOADINGOF300TONDESIGNENGINEERSHADCAREFULLYCHECKEDTHEKINEMATICSOFTHEPRESSANDTHEMANUFACTURINGANDASSEMBLIESWEREDONEWITHINTHEDESIGNSPECIFICATIONANDTHEREFORETHEPRESSWORKSFINETHOUGH,THEPRESSGENERATESLOUDNOISEWITHANDWITHOUTLOADINGTHESOUNDINTENSITYISHIGHERTHAN90DB,WHICHCAUSESVARIOUSCONCERNS,SUCHASTHERELIABILITYOFTHEMACHINEANDTHESAFETYOFTHEOPERATORTHEMECHANISMOFTHEDRIVELINEISILLUSTRATEDINFIG1A,ANDITSCADMODELISSHOWNINFIGURE1BITCONSISTSOFSEVENPARTSAMOTORNOTSHOWNINTHEFIGURETHATCONNECTSTOTHEFLYWHEELTHROUGHTHEHIGHSPEEDSHAFT,AREDUCTIONGEARSETWHICHINCLUDESTHEHIGHSPEEDGEARANDTHELOWSPEEDGEAR,ACOUPLERTHATCONTROLSTHEENGAGEMENTOFTHEGEARSETANDTHECRANK,ACRANKSLIDERMECHANISM,ANDAFOURBARMECHANISMTHATCONNECTSTOTHESLIDERAMONGTHEM,THEFOURBARMECHANISMISTHEKEYASITDOCTRINESTHEDYNAMICPERFORMANCEOFTHEPRESSL145MML2165MML3208MML4260MML580010000MME80MMFIG1AILLUSTRATIONOFTHESIXBARLINKAGEMECHANISMBTHEPHYSICALMODELOFTHEMECHANISMTHISPAPERAIMSTOFINDTHEROOTCAUSESOFTHENOISETHEPRESENTEDRESEARCHWILLINVESTIGATETHENOISEFROMVARIOUSASPECTSANDPROVIDEIMPROVEMENTSOLUTIONSTHERESTOFTHISPAPERISORGANIZEDASFOLLOWSTHESIGNATUREANALYSISOFNOISEISPRESENTEDINSECTION2INSECTION3,THEDYNAMICSOFTHESYSTEMISSTUDIEDBYRIGIDBODYDYNAMICSANALYSISANDFEMINSECTION4,ANIMPROVEDDESIGNISPROPOSEDTOREDUCETHEIMPACTNOISEFINALLY,CONCLUSIONSAREGIVENINSECTION52SIGNATUREANALYSISOFNOISESIGNAL21EXPERIMENTALSETUPASMENTIONEDEARLIER,THENOISEISTHEMAJORCONCERNOFTHEDESIGNTHEFIRSTSTEPISTOANALYZETHENOISESIGNALTHESOUNDSIGNALWASMEASUREDUSINGAMICROPHONEPLACEDCLOSELYTOTHEPRESSFIGURE2SHOWSTHEEXPERIMENTALSETUP,THEMAINAPPARATUSESINCLUDEAMICROPHONEMANUFACTURERBRELANDCTHEIMPACTFREQUENCYIS23HZITISNECESSARYTOANALYZETHEDYNAMICSOFTHEDRIVESYSTEMTOFINDTHEROOTCAUSEOFTHENOISE3DYNAMICSANALYSIS31IMPACTFORCEANALYSISTOINVESTIGATETHESOURCESOFTHENOISE,THEDYNAMICMODELOFTHESYSTEMISNECESSARYFORFURTHERINVESTIGATIONOFMECHANICAL,WHICHMAYREFLECTREALWORKINGCONDITIONS,SHOULDBECONSTRUCTEDFORANACCURATELOADINGANALYSISINTHISRESEARCH,THEDYNAMICANALYSISOFTHEPRESSISCARRIEDUSINGACOMMERCIALSOFTWARESYSTEMRECURDYNALLJOINTFORCEBETWEENTHELINKAGESAREOBTAINEDBYTHISSIMULATION,AMONGWHICHTHECONTACTFORCEBETWEENTHEGEARSISATTRACTEDOURINTERESTINGFIG7SHOWSTHECONTACTFORCEINBLACKBETWEENTHEGEARS,ANDITSDIFFERENTIATIONINORANGEEXAMININGTHEDIFFERENTIATIONOFTHEFORCE,ITISSEENTHATTHECONTACTFORCEQUICKLYCHANGESITSDIRECTIONTWICE,INAANDB,WHENTHEPUNCHISMOVINGUPTHISISVERYLIKELYTOCREATETWOBIGSHOCKSCONSEQUENTLY,ALOUDNOISEWILLBEGENERATEDDIFFERETIATIONN/SPUNCHPOSITIONMMGEARFORCENFIG7IMPACTFORCEBETWEENTHEGEARSINORDERTOFURTHERINVESTIGATETHEFREQUENCYCOMPONENTSINTHENOISESIGNAL,THOUGH,FINITEELEMENTANALYSISFEAISNECESSARY32NATURALFREQUENCIESOFTHEMECHANICALCOMPONENTSITSWELLKNOWNTHATTHEVIBRATIONISU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