Via hole imadziwikanso kuti via hole.Kuti akwaniritse zofuna za makasitomala, a
bolodi lozungulira kudzera pabowo liyenera kulumikizidwa.Pambuyo pochita zambiri, njira yamtundu wa aluminiyamu ya pulagi yasinthidwa, ndipo chigoba cha solder board ndi plug chimamalizidwa ndi mauna oyera.dzenje.Kupanga kokhazikika ndi khalidwe lodalirika.
Kudzera m'mabowo kumagwira ntchito yolumikizira ndi kuyendetsa mizere.Kukula kwa makampani opanga zamagetsi kumalimbikitsanso chitukuko cha PCBs, komanso kumapereka zofunikira zapamwamba zaukadaulo wopanga makina osindikizira komanso ukadaulo wapamwamba.Kudzera m'mabowo plugging luso linakhalapo, ndipo zofunika zotsatirazi ziyenera kukwaniritsidwa nthawi yomweyo:
(1) Pali mkuwa wokha mu dzenje, ndipo chigoba cha solder chikhoza kulumikizidwa kapena ayi;
(2) Payenera kukhala malata ndi lead mu dzenje, ndi zina makulidwe chofunika (4 microns), ndipo palibe solder kukana inki ayenera kulowa dzenje, kuchititsa malata kubisika dzenje;
(3) Mabowowo ayenera kukhala ndi mabowo a pulagi ya solder, opaque, ndipo sayenera kukhala ndi mabwalo a malata, mikanda ya malata, ndi zofunikira zowongolera.
N'chifukwa chiyani matabwa ozungulira PCB ayenera kutsekereza vias?
Ndi chitukuko cha zinthu zamagetsi motsogozedwa ndi "zopepuka, zoonda, zazifupi ndi zazing'ono", ma PCB nawonso akukula movutikira kwambiri komanso zovuta kwambiri.Chifukwa chake, ma SMT ambiri ndi ma PCB a BGA awonekera, ndipo makasitomala amafuna mabowo a pulagi akamayika zida, makamaka kuphatikiza ntchito Zisanu:
(1) Pewani malata kuti asalowe mu gawo lapansi kudzera pabowo kuti apangitse kuzungulira kwakanthawi pomwe PCB ikudutsa pakuwotchera;makamaka pamene ife kuika kudzera dzenje pa BGA PAD, tiyenera choyamba kupanga dzenje pulagi, ndiyeno golide-yokutidwa kuti atsogolere BGA soldering.
(2) Pewani zotsalira zamadzi mu dzenje;
(3) Pambuyo pa phiri lapamwamba ndi gawo la fakitale yamagetsi yamalizidwa, PCB iyenera kuchotsedwa pamakina oyesera kuti ipange kupanikizika koyipa isanamalizidwe:
(4) Pewani pamwamba solder phala kuyenda mu dzenje kuyambitsa pafupifupi kuwotcherera, zomwe zimakhudza kukwera;
(5) Pewani mikanda ya malata kuti isatuluke panthawi yowotchera, zomwe zimapangitsa kuti pakhale kuzungulira.
Kuzindikira kwa Conductive Hole Plugging Technology
Kwa matabwa pamwamba, makamaka BGA ndi IC okwera, kudzera mabowo ayenera kukhala lathyathyathya, ndi otukukira ndi concave kuphatikiza kapena kuchotsera 1 mil, ndipo pasakhale malata ofiira m'mphepete mwa dzenje;mikanda ya malata imabisika mu dzenje, kuti mukwaniritse makasitomala kukhutitsidwa Zofunikira panjira yolumikizira dzenje zitha kufotokozedwa ngati zosiyanasiyana, kuyenda kwanjira kumakhala kwautali, ndipo kuwongolera ndizovuta.Nthawi zambiri pamakhala mavuto monga kutayika kwa mafuta panthawi yowotcha mpweya komanso kuyesa kukana kwamafuta obiriwira;kuphulika kwa mafuta pambuyo pochiritsa.Tsopano kutengera momwe zinthu ziliri, njira zingapo zamapulagi za PCB zimafotokozeredwa mwachidule, ndipo mafananidwe ndi mafotokozedwe amapangidwa munthawiyi, zabwino ndi zoyipa:
Zindikirani: Mfundo yogwiritsira ntchito mpweya wotentha ndikugwiritsa ntchito mpweya wotentha kuti muchotse solder yowonjezereka pamwamba pa bolodi losindikizidwa ndi mabowo, ndipo solder yotsalayo imaphimbidwa mofanana pa mapepala, mizere yosakanizidwa ya solder ndi pamwamba. mfundo ma CD, amene pamwamba mankhwala njira ya kusindikizidwa dera bolodi.imodzi.
1. Pulagi dzenje ndondomeko mutatha kutentha kwa mpweya
Mayendedwe ake ndi: board surface solder mask → HAL → plug hole → kuchiza.Njira yopanda plug imagwiritsidwa ntchito popanga.Mpweya wotentha ukatenthedwa, chophimba cha aluminiyamu kapena chotchinga chotchinga cha inki chimagwiritsidwa ntchito kumaliza kubowola mabowo achitetezo onse omwe kasitomala amafunikira.Inki yojambulira imatha kukhala inki yowoneka bwino kapena inki ya thermosetting.Pankhani yotsimikizira mtundu womwewo wa filimu yonyowa, inki yolumikizira ndi bwino kugwiritsa ntchito inki yofanana ndi bolodi pamwamba.Izi zitha kuwonetsetsa kuti pobowo sagwetsa mafuta pakatha mpweya wotentha, koma ndizosavuta kupangitsa kuti inki yotsekera iipitse pamwamba pa bolodi ndikukhala yosagwirizana.Ndizosavuta kuti makasitomala apangitse kugulitsa pafupifupi (makamaka mu BGA) akamakwera.Makasitomala ambiri savomereza njira iyi.
2. Pulagi dzenje ndondomeko musanayambe kutentha kwa mpweya
2.1 Gwiritsani ntchito pepala la aluminiyamu kuti mutseke mabowo, kuchiritsa, ndikupera mbale kuti musamutsire chitsanzo
Pochita izi, makina obowola a CNC amagwiritsidwa ntchito pobowola pepala la aluminiyamu lomwe likufunika kulumikizidwa, kupanga mbale yotchinga, ndikutsekereza mabowo kuti zibowo zizidzaza, ndipo inki yolumikizira imagwiritsidwa ntchito pobowola. ., kusintha kwa resin shrinkage ndi kochepa, ndipo mphamvu yogwirizanitsa ndi khoma la dzenje ndi yabwino.Mayendedwe ake ndi: pretreatment → pulagi dzenje → grinding mbale → pattern transfer → etching → board surface solder mask
Njirayi imatha kuwonetsetsa kuti dzenje la plug ndi lathyathyathya, ndipo kutentha kwa mpweya sikungakhale ndi mavuto abwino monga kuphulika kwa mafuta ndi kutayika kwa mafuta m'mphepete mwa dzenje, koma ndondomekoyi imafuna nthawi imodzi makulidwe amkuwa. makulidwe amkuwa a khoma la dzenje amatha kukumana ndi kasitomala.Choncho, zofunikira zopangira mkuwa pa mbale yonse ndizokwera kwambiri, ndipo palinso zofunika kwambiri pakugwira ntchito kwa makina opera kuti zitsimikizidwe kuti utomoni pamtunda wamkuwa umachotsedwa, ndipo pamwamba pa mkuwa ndi woyera komanso wopanda madzi. kuipitsa.Mafakitale ambiri a PCB alibe nthawi imodzi yokulitsa mkuwa, ndipo magwiridwe antchito a zida sizimakwaniritsa zofunikira, zomwe zimapangitsa kuti ntchitoyi isagwiritsidwe ntchito kwambiri m'mafakitale a PCB.
2.2 Mukatha kulumikiza mabowo ndi mapepala a aluminiyamu, tsegulani chigoba cha solder pamwamba pa bolodi.
Pochita izi, makina obowola a CNC amagwiritsidwa ntchito pobowola pepala la aluminiyamu lomwe likufunika kulumikizidwa kuti lipange mbale yotchinga, yomwe imayikidwa pamakina osindikizira pazenera.Mukamaliza pulagi, siyenera kuyimitsidwa kwa mphindi zopitilira 30.Njira yoyendera ndi: Kukonzekera - plug hole - chophimba cha silika - kuphika chisanadze - kuwonekera - kukulitsa - kuchiritsa
Njirayi imatha kuonetsetsa kuti dzenje limakutidwa bwino ndi mafuta, dzenje la pulagi ndi lathyathyathya, ndipo mtundu wa filimu yonyowa ndi womwewo.Pads, zomwe zimapangitsa kuti pakhale kusakhazikika bwino;Pambuyo pakuwotcha kwa mpweya, m'mphepete mwa mavuvu a dzenje ndi mafuta amachotsedwa.Ndizovuta kuwongolera kupanga pogwiritsa ntchito njira iyi, ndipo wopanga makinawo ayenera kutengera njira zapadera ndi magawo kuti atsimikizire mtundu wa dzenje la pulagi.
N'chifukwa chiyani matabwa ozungulira PCB ayenera kutsekereza vias?
2.3 Pambuyo pa aluminiyumu pepala kumangirira mabowo, akukula, chisanadze kuchiritsa, ndi akupera bolodi, bolodi pamwamba soldered.
Gwiritsani ntchito makina obowola a CNC kuti mubowole pepala la aluminiyamu lomwe limafunikira mabowo a pulagi, pangani mbale yotchinga, ndikuyiyika pamakina osindikizira pamabowo a pulagi.Mabowo a pulagi ayenera kukhala odzaza, ndipo mbali zonse ziwiri ndizowoneka bwino.Njira yoyendera ndi: Kuchiza chisanachitike - bowo la pulagi - kuphika chisanadze - chitukuko - kuchiritsa - chigoba cha board surface solder
Chifukwa njirayi imatenga machiritso a plug-hole kuti atsimikizire kuti pobowo sataya mafuta kapena kuphulika mafuta pambuyo pa HAL, koma pambuyo pa HAL, zimakhala zovuta kuthetsa vuto la malata pa dzenje ndi malata pa dzenje, kotero makasitomala ambiri savomereza.
2.4 Chigoba cha solder pamwamba pa bolodi ndi dzenje la pulagi zimamalizidwa nthawi yomweyo.
Njirayi imagwiritsa ntchito 36T (43T) mesh yotchinga, yomwe imayikidwa pamakina osindikizira, pogwiritsa ntchito mbale kapena bedi la msomali, ndikutsegula mabowo onse pomaliza bolodi.Mayendedwe ake ndi: pretreatment--screen print--Pre-bake--Exposure-Development--Cure
Izi zimakhala ndi nthawi yochepa komanso zida zogwiritsira ntchito kwambiri, zomwe zingathe kuonetsetsa kuti pobowo sitaya mafuta ndipo pobowo sidzatsekedwa ndi mpweya wotentha., Mpweya umatambasula ndikuswa chigoba cha solder, kuchititsa voids ndi kusagwirizana.Padzakhala pang'ono kudzera mabowo obisika mu malata panthawi yotentha ya mpweya.Pakali pano, kampani yathu kwenikweni anathetsa dzenje ndi mkangano wa kudzera dzenje pambuyo zambiri zatsopano, kusankha mitundu yosiyanasiyana ya inki ndi mamasukidwe akayendedwe, kusintha kuthamanga kwa silika chophimba kusindikiza, etc., ndipo ndondomeko wakhala anatengera kwa misa kupanga .
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