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1、SMT技术一、SMT简单介绍SMT-SurfaceMountedTechnology,即表面贴装技术,是一种先进的电路组装技术,自上个世纪60年代问世以来,就充分显示出其强大的生命力,它以非凡的速度走完了从诞生、完善直至成熟的路程,迈入了大范围的应用旺盛期。如今无论是投资类电子产品还是民用类电子产品,都有它的身影。SMT-SurfaceMountedTechnologycameoutinthe1960s,whichisanadvancedtechnologyservicedforcircuitmanufacturing,an
2、dfromthenithasbeenstrongerwhichcomesthroughthecourseofnaissance,growth,andmaturationasthespeedofextraordinary.Andnowithascomingintotheapplicationbloomswhetherintheareasofinvestmentorcivilusing.SMT是一门新兴的、综合性的工程科学技术,涉及到机械、电子、光学、材料、化工、计算机、网络、自动控制等技术。SMTisanewly&synthe
3、ticalengineering&scienceTech.whichdealswithmechanism,electron,optics,material,chemistry,computer,net,auto-controlTech.etc.SMT从狭义上讲,是将表面元器件贴装到PCB上,经过整体加热实现电子元器件的互联;从广义上讲,它包括片式元器件、表面组装工艺和材料。AccordingtothenarrowsensewedescribeSMTisputthepartsontoPCBandthenbywholecalef
4、actiontorealitytheelectronparts&padsjointing,andaccordingtoboardsenseSMTincludingsliceparts,processandmaterials.SMT工艺有以下组成部分,包括:PCB准备检查、检查工艺;焊膏印刷、检查工艺;贴装工艺;贴装后插件、检查;固化工艺;在线检查工艺;修正工艺;在线检测即ICT;质量检查;功能测试;返修工艺;包装工艺;标签工艺等。SMTprocessconsistsofthefollowingparts:Boardprepa
5、ration&checking,ScreenPrinting,Mount,Handplacement&checking,Reflow,AOI,Modification&Stuffing,ICT,Qualitychecking&assure,FAT,Rework,Package,Labeletc.SMT生产线由上料机、锡膏印刷机、接驳台、贴片机、回流焊、AOI设备、ICT设备、FAT设备、下料机等组成。SMTproductionlineconsistsofLoading,Screenprinting,Handplacedesk
6、,Mounter,Reflow,AOI,ICT,FAT,Unloadingequipmentetc.二、SMT特点1、组装密度高、电子产品体积小、重量轻,贴片元件的体积和重量只有传统插装元件的1/10左右,一般采用SMT后,电子产品的体积缩小40%~60%,重量减轻60%~80%;Highmountconsistency,littlecubage&weighofelectronicproduct.Thecubage&weighofcomponentisabout1/10ofthetraditionalinsert-parts
7、.Theelectroniccubagewillreduceabout60%~80%afteradoptingtheSMT.2、可靠性高、抗震能力强,焊接缺陷率底;Highdependability&quiveryresistancecapabilityandlowsolderdefectsetc.3、高频特性好,减少了电磁和射频干扰;Goodqualityofhighfrequencytoreducetheinterferenceofelectromagnetism&radial.4、易于实现自动化,生产效率高,降低约为3
8、0%~50%的成本。节省材料、能源、设备、人力、时间等。Easytorealizeautomatization,highproductefficient,reduceabout30%~50%costsandsavematerial,energy,equipment,timeetc.第1页共