金线机打线资料.ppt

《金线机打线资料.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、ZDISPLACEMENTCURVEThefollowingparagraphsdescribeatypicalbondcycleusingreversemotion.Althoughusingreversemotionwilladdtothetotalcycletime,theloopprofilesarequiteenhancedforlongwires.Abondcycleusingreversemotiontakesroughly115milliseconds,dependingonbondingpa

2、rametersused.HeatFirstHalfCycleSecondHalfCycleRESETThebondingcyclebeginswiththebondheadattheresetposition.Aballhasbeenformedfromthepreviouscycle.TheXYtablehaspositionedthecapillaryoverthefirstbondposition.Thewireclampsonthebondheadareopen,andvacuumtensionis

3、applied.ResetZDISPLACEMENTCURVEDescenttofirstBondResetDESCENTTOFIRSTBONDHighspeeddescentbegins.Vacuumabovethebondheadsuppliesasmallamountofdragtothewire,keepingtheballseatedintheinnerchamferofthecapillary.ZDISPLACEMENTCURVEFirstTipDescenttofirstBondResetTOO

4、LINFLECTIONPOINT(TIP)Atauser-configuredheight(3-35mils)abovethefirstbondsurface,thebondheadslowsdowntoaconstantspeedknownasbondvelocity.Thecomputerawaitsforcontactthresholdtoregisterthatthecapillaryhasmadeimpactwiththesurface.Thewireclampscloseforaninstantt

5、oinhibittheballfromflyingoutofthecapillaryduetoinertiaatthischangeofvelocitypoint.ZDISPLACEMENTCURVEForceUSGHeatFirstBondFirstTipDescenttofirstBondResetFIRSTBONDThecapillarytouchesthesurface.Thecomputerappliestheprogrammedforce.(Thisisnotseeninthedisplaceme

6、ntcurvesinceitisderivedfrommotionsofthecapillary).Thecomputerfirestheultrasonicpowerfortheprogrammedamountoftime.ZDISPLACEMENTCURVERisetoKinkForceUSGHeatFirstBondFirstTipDescenttofirstBondResetRISETOKINKHEIGHTBondheadbeginsascent.Thebondheadisdrivenupinhigh

7、velocitytoaprogrammedheightknownaskinkheightandstops.ZDISPLACEMENTCURVEReverseMotionRisetoKinkForceUSGHeatFirstBondFirstTipDescenttofirstBondResetREVERSEMOTIONTheXYtablemoves180degreesawayfromthesecondbondpointaprogrammeddistance.Thisputsareversebendinthewi

8、rewhichwillstrengthenthewireprofile.ZDISPLACEMENTCURVERisetoLoopFactorReverseMotionRisetoKinkForceUSGHeatFirstBondFirstTipDescenttofirstBondResetRISETOLOOPFACTORThebondheadrisestoaloopheightcalculatedb