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哈尔滨理工大学学士学位论文I摘要针对目前在钣材上冲栽不同形式的孔需要换几次模或在不同冲床上进行加工。这样不但降底了生产效率、增加工人劳动强度还不能保证工件的精度。为了解决这个问题我现在设计一种自动换模机，用一个工序来完成不同形式孔的冲栽。冲床上安有两个转盘，分别装有同样数目的凸模和凹模，凸模装在上转盘，凹模装在下转盘。凸模和凹模互相对准，同步回转，来实现自动换模。上、下转盘的转轴并不相连，以便工件通过，只有位于压力机滑块下的凸模可以随滑块上下滑动进行冲压，其于的凸模都不动。冲裁过程中需要的模具按数控指令转入压力机滑块下，对板材进行加工。关键词转盘；凸模；凹模；换模哈尔滨理工大学学士学位论文IIAbstractInviewofblankingdifferenttypesholesonthesheetmetal,itisnecessarytoreplaceseveralmodelsorprocessonthesomepunches,whichnotonlyreducesproductionefficienencyandincreaseworker’slaborintensity,butalsonotguaranteetheprecisionofworkpiece.Inordertosolvetheproblem,wearedesigningoneautomaticalreplacingmodelmachine,whichcouldblankdifferentformsholesinsomeprocedure.Therearetwotableonthepunchwhichhavethesamenumbermalemouldsandfemaledies.Malemouldisontheupperrotarytable,whilefemaleisontheturntable.Twomodelsaremutuallyaligned,synchronizevibrating,aimingatreplacingmodelsautomatically.Theshaftsoftwotherotarytablesaren’tlinked,tomakeworkpiecespass.Onlyonepairofmalemouldunderthepressslidercouldmoveupanddownwiththeslider,carryingoutstamp,butothermalemouldsstayquiet.BasedontheNCinstrction,punchdiesontherotarydiskwilltransferredtoundersurfaceofthepressslidertoprocessthesheetmetals.KeywordsTurntable；Plunger；Lowerdie哈尔滨理工大学学士学位论文III目录摘要.........................................................................................................................IAbstract................................................................................................................II目录......................................................................................................................III第1章绪论........................................................................................................11.1课题背景................................................................................................11.1.1国内模具的现状...........................................................................11.1.2国内模具的发展趋势...................................................................21.2国外模具的现状和发展趋势.................................................................31.4本文研究的主要内容............................................................................4第2章换模机构设计........................................................................................52.1换模机构驱动电机的选择.....................................................................52.2步进电机工作原理..................................................................................52.3传动方式的选择.....................................................................................82.4自动换模工作原理.................................................................................92.5传动轴设计...........................................................................................102.6传动齿轮设计.......................................................................................102.7压力机的选择.......................................................................................14第3章冲压模具设计......................................................................................143.1冲压的概念、特点及应用...................................................................143.2冲压的基本工序及模具......................................................................163.3冲压技术的现状及发展方向..............................................................173.3.1冲压成形理论及冲压工艺方面.................................................173.3.2冲模的设计制造方面.................................................................183.3.3冲压设备和冲压生产自动化方面............................................193.3.4冲压标准化及专业化生产方面.................................................203.4薄板冲模的冲压原理和受力分析.......................................................203.5凸凹模设计..........................................................................................23哈尔滨理工大学学士学位论文IV3.5.1冲压主要技术参数.....................................................................233.5.2冲压图形.....................................................................................233.5.3凸凹模刃口尺寸计算.................................................................233.5.4冲压工艺力.................................................................................243.6上、下模座的设计............................................................................25第4章液压定位支承销设计..........................................................................264.1液压定位支撑销作用..........................................................................264.2液压定位支撑销的组成......................................................................264.3液压定位支撑销尺寸确定..................................................................27第四章三维实体造型........................................................................................324.1概述................................................................................................................324.2凸模的建模过程...................................................................................32第4章装配........................................................................................................344.1装配过程..................................................