spt劈刀设计.ppt

basiccapillarydesignrules（劈刀基本设计规则）,thefreeairballfabiscenteredinsidethecapillarychamfer.（金球被真空吸入劈刀内切角处）,bondingsequence（焊线顺序）cycle1（第一步）:,ballbondformation（球形形成）,bondingsequence（焊线顺序）cycle2（第二步）:,afterloopingformation,cycleperformsstitchbondprofile.（弧度形成后，焊接第二焊点）,bondingsequence（焊线顺序）cycle3（第三步）:,tailformation（尾丝形成）,bondingsequence（焊线顺序）cycle4（第四步）:,detachtailfromthestitch.（从第二焊点处拉断尾丝）,bondingsequence（焊线顺序）cycle5（第五步）:,freeairballfabformation（打火烧球形成金球）,bondingsequence（焊线顺序）cycle6（第六步）:,capillarytravelpathformingatypicalloopprofile（劈刀行程路线形成弧度形状）,loopingformation（弧度形成）:,capillarydimensionsaffectstheballbondformation（影响第一焊点的劈刀尺寸参数）:,t,fa,h,cd,or,1stbond(ball)（变形后的金球）,ca,holesize(h)（孔径）,h,wd,h（孔径）=wd（线径）+40%10%recommended（推荐）:h=1.4wdforfinepitch（小间距）:h=1.3wd(min),chamferdiameter(cd)（内切角直径）:,cdmbd（变形后的金球直径）/1.2(bpo铝垫开窗-*10m)/1.2h孔径+10m,*10mclearanceincludesmachine/operatorerror,capillarytolerance（10m包含设备/操作者的误差，劈刀尺寸的公差）,cd,mbd,chamferangle(ca)内切角角度:,cd,mbd,mbd,cd,ca(70),ca(120),bigger（大）ca-biggermbd,*withthesame（相同）cd,h,fab&wd,smaller（小）ca-smallermbd,innerchamfericfunction（内切角的作用）,fabcentering（金球定中心）,resultantfromustransfer（与超声波传递的界面）,t,fa,or,capillarydimensionsaffectsthestitchbondformation（影响第二焊点的劈刀尺寸参数）:,2ndbond(stitch),stitchlengthformedbyt,cdandor（鱼尾长度由t,cdandor形成）,wd,or,sl,t,or-facombination（结合）:,smaller（小）fabigger（大）or,or,or,fa,fa,bigger（大）fasmaller（小）or,stitchprofilebasedonoutsideradius(or)（第二焊点形状基于外切角半径）：,reducedweld(stitch)lengthforbigor（大or减少鱼尾长度）,wd,or,or,maximumcomputedor（最大的计算or）,or(max)=(t-cd)/2cos(ta/2)/cos(ta/2+fa)tan(90+ta/2+fa)/2,or(max),(t-cd)/2,ta/2,fa,orbasedon（基于）tipdiameter(t):,or,fa,wd,tor,360m330-300m250-200m180-165m150-130m120-110m100-75m70m,t,=75m=64m=51m=38m=30m=20m=12m=10m,cdtermination（终止）ofthestitch(鱼尾）:,firstbond(ballformation):第一焊点形成,freeairball,mashedball,freeairball空气球=mashedball变形球:,freeairball,mashedballdiameter,fab,mbd,vol体积fab=vol体积mbd,volfab,volmb,freeairball空气球=mashedball变形球（体积）,fab,volfab=volmb,cd,ca,h,mbd,1,2,3,vol2,vol3,+,+,volfab,=,vol1=3h2(h-wd)/16,vol1,vol2=(cd3-h3)/24tan(0.5ca),vol3=mbd2(mbh)/4,mbh,wd,volfab=fab3/6,+,+,=,fab=mbvolumeequation综合:,volfab=volmb,fab3/6=3h2(h-wd)/16+(cd3-h3)/24tan(0.5ca)+mbd2(mbh)/4,=,fab3=18h2(h-wd)/16+(cd3-h3)/4tan(0.5ca)+3mbd2(mbh)/2,critical（临界）loopheight(clh):,clh,bna,highreverseloop,normalloop,tipdiameter(t):,t,t(max)=2bpp-wd-(2lh-wd)tan(ta/2)-24,bpp,wd,lh,ta(mtaorbna),tipdiameter(t):,t,tcd+2or,bpp,wd,lh,ta(mtaorbna),or,tipdiameter(t):,ta/2,wd+clearance(e),t/2,a,b,bpp,lh-mbh,t/2=bpp-a-b,t(max)=2bpp-(wd+e)cos(ta/2)-2lh-2mbh-w