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1、球墨铸铁的曲轴发展和锻造Theerankshaftisoneofthekeypartsofthecarengine,itsfunctionandqualitydirectlyaffectthebirthdayofthecar・Crankshaftisworkingunderheavyloadandconstantchangesofbendingmomentandtorsionmoment,thefailureofmanymethodsforthebenclingfatiguecrackingandj
2、ournalwearandconsequentlyneedcrankshaftmaterialhashighrigidityandfatiguestrengthandexcellentwear-resistingfunction.Withtheexpansionoftheductileironskills,itsfunctionisconstantlyonthemove,andthequalityuntouchablebulbhasbecomeoneoftheimportantmaterialsto
3、makethecrankshaft・Sincethecreationofductilecastironin1947,thetensilestrengthoftheballhasadvaneedto600〜900MPa,whichisclosetoorabovethelevelofcarbonstee1.Comparedwithforgingsteelmaterials,nodularcastironcrankshafthasbothcapitaltomanufacturesimple,cheap,a
4、ndshockabsorption,abrasionresistaneeandisnotsensitivetosurfacecrackforgingsteelmaterialsdonothaveoutstandingfeatures,andnodularcastironhasthepossibilityofalternativeforgingsteelcrankshaft.Inthelate1950s,thenationalnanjingcarfactorymadethefirstbatchofth
5、eleapforward.Inthe1960s,theautomakerwasthefirstinthecountrytoplanandputintoproductioninaccordaneewiththerailwaycrankshaft・Inthe70sand80s,smallandmedium-sizeddieselenginerapidlyinourcountry,becauseoftheductileironmanufacturingandeconomicadvantages,mosts
6、mallandmedium-sizedchoosesductileironerankshaftofdieselengine,greatlypromotedtheuseofductileironcrankshaftwithChina,appearedabatchofductileironerankshaftprofessionalproductionfactory.Nearlytenyearsinthecarindustryintheprocessofrapidexpansion,andabatcho
7、fnewmodernizationoftheductileironcrankshaftproductionfactory(orfactory,workshop),theductileironcrankshaftisthroughoutinthedomesticuse・Abroadductileironcrankshaftisusedwidely,intheearly1950s,foreignisbeginningtoproducecrankshaftofnodularcastironusedin,s
8、uchasfordfirstuseintheUnitedStates,theUnitedStatesofChrysler,SwissGFcompany,France，sRenaultandCitroencompany,Italy，sfiatspa,RomaniabrasovJiaoCheChangetchassucceededinapplicationofnodularcastirontothefruitofthecrankshaft・InGermany,adiese
