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1、南昌航空大学硕士学位论文尼龙6选区激光烧结材料的制备及性能研究姓名：辛集忠申请学位级别：硕士专业：机械制造及其自动化指导教师：张坚20080610ThePreparationandPropertiesofNylon6forSelectiveLaserSinteringAbstractRapidprototypingtechnologyisoneoftheintegratedsubject,whichisdevelopedwiththenumericalcontroltechnology,computerscience,materialscienceandotherstudies.Itisane
2、wtypeofthedigitalformingtechniqueonthebaseofdispersing/accumulatingmouldtheory.Itproducetheoriginalshapeorpartsofgoods,foritcontrolledbythecomputerandbasedonparts’CADmould,itaccumulatingmaterial’sprecision.Selectivelasersinteringisoneoftheuppermostrapidprototypingtechnology,becauseitselectmaterialab
3、road,anditcompact-abilityisnotinfluencebytheparts’complexitygrade.Ithasgreatapplicationsforeground.TheresearchofSLSmaterialistheimportanttacheinthestudyofSLStechnology.ThemechanicspropertyandCompact-abilityofNylon-6materialisverywell,Nylon-6isoneofthebroadapplicableengineeringplastic.Thearticletryto
4、usedNylon-6asselectivelasersinteringmaterial,viamodifyingtheNylon-6material,improveitscompactabilityandmechanicalproperty.UtilizingthemeansofSEM,XRDandtokenthesinteringproduct’shistologicalstructure,wecanfindouttherelationbetweenhistologicalstructureandmechanicalproperty.TheinvestigateoftheSLSparame
5、terindicatethatwhenlaserpoweris25%,sinteringvelocityis1200mm/s,sinteringspaceis0.1mm,powerthicknessis0.1mm,sinteringproducttensilestrengthisthelargest.Sinteringparametershowsenergydensityisthemainfactorforsinteringproduct’scapability.Iftheenergydensityisthesame,thesinteringproduct’sshrinkagealmostth
6、esame.Whiletheenergydensityisincreasing,thesinteringproductbulkdensityisincreasing,whenitachievetoacertaintynumericalvalue,sinteringproductbulkdensitywillnotincrease.Theresultofresearchdiscoverthatlithiumstearatecanminishthemovingofspreadpowereffective.Whenthepercentageoflithiumstearatequalityis0.7%
7、,sinteringproductwillnotchangeanymore.Ifweaddsomeglassbeadtonylon-6power,itisnotonlyimprovethepowerpavecapability,butalsoadvancethetensilestrength.Whenthepercentofglassbeadqualityis2%,sinteringproduct
