1. PCB loj
【 Background Description】 Qhov loj ntawmPCByog txwv los ntawm lub peev xwm ntawm cov khoom siv hluav taws xob ua cov kab ntau lawm.Yog li ntawd, qhov tsim nyog PCB loj yuav tsum tau txiav txim siab nyob rau hauv kev tsim ntawm cov khoom system scheme.
(1) Qhov siab tshaj plaws PCB loj uas SMT cov cuab yeej tuaj yeem txuas tau los ntawm tus qauv loj ntawm daim ntawv PCB, feem ntau yog 20 "× 24", uas yog, 508mm × 610mm (rail dav)
(2) Qhov loj me me uas pom zoo yog qhov sib piv ntawm txhua yam khoom siv hauv SMT cov kab ntau lawm, uas yog qhov tsim nyog rau kev tsim khoom ntawm txhua yam khoom siv thiab tshem tawm cov khoom siv tsis muaj dab tsi.
(3) Rau cov PCBs me me, nws yuav tsum tau tsim los ua qhov kev txiav txim siab los txhim kho kev ua haujlwm ntawm tag nrho cov kab ntau lawm.
【Design Requirements】
(1) Feem ntau, qhov siab tshaj plaws ntawm PCB yuav tsum raug txwv nyob rau hauv thaj tsam ntawm 460mm × 610mm.
(2) Qhov loj me uas pom zoo yog (200 ~ 250) hli × (250 ~ 350) hli, thiab qhov sib piv yuav tsum yog <2.
(3) Rau PCB nrog qhov loj ntawm "125mm × 125mm", nws yuav tsum tau ua kom haum rau qhov loj me.
2. PCB puab
[Cov lus piav qhia yav dhau los] SMT cov cuab yeej tsim khoom siv cov kev taw qhia kev thauj khoom PCBs, thiab PCBs nrog cov duab tsis zoo tuaj yeem thauj tsis tau, tshwj xeeb tshaj yog cov PCBs nrog cov ntawv ntawm cov ces kaum.
【Design Requirements】
(1) Cov duab ntawm PCB yuav tsum yog ib lub xwmfab tsis tu ncua nrog cov ces kaum sib npaug.
(2) Txhawm rau kom muaj kev ruaj ntseg ntawm cov txheej txheem kev sib kis, txoj kev tso cai yuav tsum tau txiav txim siab los hloov cov txheej txheem tsis tu ncua ntawm PCB rau hauv cov qauv square, tshwj xeeb tshaj yog nyob rau hauv lub kaum qhov khoob yuav tsum tau ntim kom tsis txhob muaj yoj lub puab tsaig thaum lub sij hawm sib kis.Nruab nrab daim npav.
(3) Rau cov ntshiab SMT boards, qhov khoob tau tso cai, tab sis qhov loj ntawm qhov sib txawv yuav tsum tsawg dua ib feem peb ntawm qhov ntev ntawm sab.Rau cov uas tshaj qhov yuav tsum tau, sab txheej txheem tsim yuav tsum tau sau.
(4) Kev tsim chamfering ntawm tus ntiv tes golden tsis yog tsuas yog yuav tsum tau tsim chamfering ntawm sab ntxig, tab sis kuj tsim (1 ~ 1.5) × 45 ° chamfering ntawm ob sab ntawm lub rooj tsavxwm plug-in los pab txhawb kev nkag.
3. Kev xa tawm sab
[Cov lus piav qhia tom qab] Qhov luaj li cas ntawm cov ntug conveying yog nyob ntawm qhov yuav tsum tau ntawm cov kev taw qhia kev tsheb nqaj hlau ntawm cov khoom siv.Rau cov tshuab luam ntawv, cov tshuab tso kawm thiab reflow soldering furnaces, lub conveying ntug feem ntau yuav tsum tau ntau tshaj 3.5 hli.
【Design Requirements】
(1) Txhawm rau txo qhov deformation ntawm PCB thaum lub sij hawm soldering, qhov ntev sab kev taw qhia ntawm cov tsis-imposition PCB feem ntau yog siv raws li cov kev taw qhia kis tau tus mob;rau qhov kev txiav txim, qhov ntev sab kev taw qhia kuj yuav tsum tau siv raws li cov kev taw qhia kis tau tus mob.
(2) Feem ntau, ob sab ntawm PCB los yog imposition kis tau tus mob kev taw qhia yog siv raws li ib tug kis tau tus mob.Qhov tsawg kawg nkaus qhov dav ntawm sab kis yog 5.0mm.Yuav tsum tsis muaj cov khoom sib txuas lossis cov pob qij txha nyob rau hauv pem hauv ntej thiab nraub qaum ntawm sab kis.
(3) Nyob rau sab tsis sib kis, tsis muaj kev txwv rau cov khoom siv SMT, thiab nws yog qhov zoo tshaj plaws los tiv thaiv thaj tsam 2.5 hli.
4. Qhov chaw qhov chaw
[Cov lus piav qhia hauv qab] Ntau cov txheej txheem xws li kev tsim kho, kev sib dhos, thiab kev sim xav tau qhov tseeb ntawm PCB.Yog li ntawd, qhov positioning qhov feem ntau yuav tsum tau tsim.
【Design Requirements】
(1) Rau txhua lub PCB, tsawg kawg yog ob lub qhov chaw yuav tsum tau tsim, ib qho yog tsim los ua ib lub voj voog, thiab lwm qhov yog tsim los ua qhov ntev.Cov qub yog siv rau kev tso npe thiab tom kawg yog siv rau kev taw qhia.
Tsis muaj qhov tshwj xeeb uas yuav tsum tau ua rau qhov chaw aperture, nws tuaj yeem tsim tau raws li qhov tshwj xeeb ntawm koj lub Hoobkas, thiab qhov pom zoo diameters yog 2.4mm thiab 3.0mm.
Qhov chaw qhov chaw yuav tsum yog qhov tsis yog hlau.Yog hais tias lub PCB yog ib tug punched PCB, qhov positioning qhov yuav tsum tau tsim nrog ib lub qhov phaj los txhim kho rigidity.
Qhov ntev ntawm qhov taw qhia qhov feem ntau yog ob zaug ntawm txoj kab uas hla.
Qhov nruab nrab ntawm qhov chaw tso chaw yuav tsum yog ntau tshaj 5.0mm ntawm qhov sib kis, thiab ob qhov chaw yuav tsum nyob deb li deb tau.Nws raug nquahu kom npaj lawv ntawm cov ces kaum ntawm PCB.
(2) Rau cov PCBs sib xyaw (PCBAs nrog plug-ins ntsia, txoj hauj lwm ntawm lub qhov tso tawm yuav tsum zoo ib yam li pem hauv ntej thiab nraub qaum, kom cov qauv tsim cov cuab yeej tuaj yeem sib koom ntawm pem hauv ntej thiab nraub qaum, xws li cov ntsia hlau. hauv qab bracket kuj tseem siv tau rau lub tais plug-in.
5. Cov cim qhia
[Cov lus piav qhia hauv qab] Niaj hnub nimno tso cov tshuab, tshuab luam ntawv, khoom siv kho qhov muag (AOI), cov khoom siv tshuaj ntsuam xyuas cov tshuaj nplaum (SPI), thiab lwm yam.Yog li ntawd, optical positioning cim yuav tsum tau tsim ntawm PCB.
【Design Requirements】
(1) Cov cim qhia tau muab faib ua cov cim qhia thoob ntiaj teb (Global Fiducial) thiab cov cim qhia hauv zos (Local Fiducial)
Fiducial).Lub qub yog siv rau qhov chaw ntawm tag nrho lub rooj tsavxwm, thiab lub tom kawg yog siv rau qhov chaw ntawm imposition sub-boards los yog nplua-pitch Cheebtsam.
(2) Optical positioning cim tuaj yeem tsim los ua squares, pob zeb diamond, voj voog, hla, qhov dej, thiab lwm yam, nrog qhov siab ntawm 2.0mm.Feem ntau, nws raug pom zoo kom tsim lub voj voog tooj liab txhais qauv ntawm Ø1.0m.Xav txog qhov sib txawv ntawm cov khoom siv xim thiab ib puag ncig, thaj tsam tsis yog 1 hli loj dua li qhov pom kev pom qhov cim tseg, thiab tsis muaj cov cim tso cai rau hauv nws.Peb ntawm tib lub rooj tsavxwm Lub xub ntiag los yog tsis muaj cov ntawv ci tooj liab nyob rau hauv txheej sab hauv yuav tsum zoo ib yam hauv qab lub cim.
(3) Ntawm PCB nto nrog SMD Cheebtsam, nws raug nquahu kom npaj peb qhov chaw kho qhov muag cim rau ntawm lub ces kaum ntawm lub rooj tsavxwm rau lub tso suab tso suab ntawm PCB (peb lub ntsiab lus txiav txim siab lub dav hlau, thiab qhov tuab ntawm cov nplaum nplaum tuaj yeem kuaj pom) .
(4) Rau qhov kev txiav txim, ntxiv rau kom muaj peb qhov chaw kho qhov muag cim rau ntawm tag nrho lub rooj tsavxwm, nws yog qhov zoo dua los tsim ob lossis peb qhov kev txiav txim siab qhov muag pom ntawm cov ces kaum ntawm txhua lub rooj tsavxwm.
(5) Rau cov khoom siv xws li QFP nrog qhov nruab nrab ntawm qhov nruab nrab ntawm ≤0.5mm thiab BGA nrog qhov chaw nruab nrab ntawm ≤0.8mm, cov cim hauv zos kho qhov muag yuav tsum tau teeb tsa rau ntawm kab pheeb ces kaum rau qhov tseeb qhov chaw.
(6) Yog tias muaj cov khoom txuas ntawm ob sab, txhua sab yuav tsum muaj cov cim qhia qhov muag pom.
(7) Yog tias tsis muaj qhov chaw tso rau ntawm PCB, qhov chaw nruab nrab ntawm qhov chaw kho qhov muag yuav tsum yog ntau tshaj 6.5 hli ntawm qhov sib kis ntawm PCB.Yog tias muaj qhov chaw tso rau ntawm PCB, qhov chaw nruab nrab ntawm qhov chaw kho qhov muag yuav tsum tau tsim los ntawm ib sab ntawm qhov chaw nyob ze ntawm qhov chaw ntawm PCB.
Post lub sij hawm: Apr-08-2023