1. N'chifukwa chiyani lamulo dera bolodi mosabisa kwambiri
Mu mzere basi mayikidwe, ngati bolodi yosindikiza dera si mosabisa, iwo adzachititsa malo kukhala zolakwika, zigawo zikuluzikulu sangathe anaikapo mu dzenje ndi pamwamba pa bwalolo, ndipo ngakhale basi pulagi loader.When ndi pcb gulu lomwe anasonkhana chigawo ndi welded pambuyo soldering, ndipo phazi la amafotokozera ndi zovuta kudula neatly.The PCB gulu simungakhoze kuikidwa mu makina bokosi kapena zitsulo mu makina, choncho, pcb msonkhano fakitale msonkhano mbale angasokonezeke ndi troublesome.At kwambiri panopa, gulu yosindikiza dera walowa nyengo ya padziko unsembe ndi Chip unsembe, ndi kusindikizidwa dera bolodi khamu chomera ayenera kukhala ndi zambiri kwambiri ndi chofunika pa wa mbale amasokoneza.
2. Standard kuyesedwa njira m'litali
Malinga ndi United States IPC-6012 (1996 kope) << okhwima kusindikizidwa dera bolodi chizindikiritso ndi specifications ntchito >>, ndi kololeka pazipita warping ndi kupotoza pamwamba ogwiritsa mbale ndi 0,75%, ndi onse matabwa ena pcb saloledwa 1.5% .This chawonjezeka ndi zofunika pamwamba ogwiritsa mbale gulu la ipc-RB-276 (1992 Baibulo) .At panopa, m'litali digiri ya chiphaso aliyense pakompyuta pcb khamu chomera, kaya awiri kapena Mipikisano wosanjikiza pcb, 1.6mm makulidwe, kawirikawiri 0,70 ~ 0,75%, ambiri SMT, BGA mbale, chofunika ndi 0.5% .Some zamagetsi mafakitale ndi ananthunthumiritsa kwa kuwonjezeka peresenti 0,3 mfundo warping, ndi miyeso mayeso warping kutsatira gb4677. 5-84 kapena ipc-TM-650.2.4.22b.Put PCB bolodi pa nsanja kutsimikizika, mayeso singano kuti kuwalepheretsa digiri yaikulu kwambiri m'deralo, kuyesa awiri la singano, anagawa ndi pamapindikira kutalika kwa gulu PCB, m'litali digiri ya dera bolodi kusindikizidwa kuchita masamu.
3. Warping pa zotsimikizira ndondomeko
1. Engineering kapangidwe: kamangidwe ka bolodi yosindikiza dera tidzakwatulidwa anati:
A. Dongosolo la prepreg pakati pa zigawo ayenera kukhala symmetrical, monga laminates asanu PCB Board , ndi makulidwe a 1 ~ 2 5 ~ 6 zigawo ayenera kukhala mogwirizana ndi chiwerengero cha ndalama theka-Unalimbitsa, mwinamwake wosanjikiza kuthamanga idzakhala yophweka kwa kuwalepheretsa.
B. NAC-laminated pakati pcb ndi miyala theka-anachiritsa tidzakwatulidwa ntchito mankhwala katundu wa chomwecho.
C. The dera lakunja mizere A ndi B ayenera kukhala pafupi possible.If nkhope ndimalo mkuwa padziko, ndi B kokha A mizere ochepa, mbale n'zosavuta kuwalepheretsa pambuyo etching.If mbali ziwiri za mzere m'dera kusiyana ndi waukulu kwambiri, inu mukhoza kuwonjezera zina gululi osayanjanitsika kumbali zowonda kuti moyenera.
2, kuphika gulu pamaso kudula:
CCL kuphika pcb gulu pamaso kudula (madigiri 150, 8 ± 2 hours) kuti cholinga ndi kuchotsa chinyezi mkati bolodi, ndi kupanga utomoni ndi kudzachiritsidwa mkati mbale, mopitirira kuchotsa maganizo yotsalira mu mbale, zomwe ndi othandiza kuteteza bolodi warping.At pano, ambiri awiri kumbali pcb, Mipikisano wosanjikiza pcb matabwa akadali kutsatira chisanadze blanking kapena pambuyo adzaphika step.But palinso zina pcb gulu kupanga fakitale, tsopano bolodi PCB dera fakitale kuphika gulu malamulo nthawi komanso kosagwirizana, kuyambira mawola 4 mpaka 10, anandiuza kuti kalasi mogwirizana ndi kupanga kusindikizidwa dera bolodindi kufunika kasitomala kwa madigiri m'litali kuti decide.Cut powomba kapena pambuyo chidutswa lonse la kuphika kuphika uvuni kudula chuma, njira ziwiri ndi zotheka, izo tikulimbikitsidwa kudula thabwa pambuyo kudula. Bolodi mkati ayeneranso atayanika bolodi.
3. m'litali ndi weft wa prepreg:
Pambuyo pa prepreg lamination, ndi shrinkage mu m'litali ndi weft malangizo ndi osiyana, ndi m'litali ndi weft mayendedwe ayenera kuwasiyanitsa pamene blanking ndi stacking.Otherwise, n'zosavuta m'litali yomalizidwa mbale pambuyo laminating, ngakhale kuti zimavuta kukonza. Mipikisano wosanjikiza pcb warping zifukwa, ambiri lamination wa prepreg pamene m'litali ndi weft sanali kusiyanitsa, chosaneneka mwendo chifukwa cha.
Kodi kusiyanitsa kumpoto ndi longitude? Pereka prepreg anapinda malangizo ndi m'litali, ndipo m'lifupi malangizo ndi weft; mkuwa gulu zojambulazo mbali lalitali la latitudinal, mbali lalifupi m'litali, ngati si onetsetsani kuti ndi Mlengi kapena katundu.
4. kupanikizika pambuyo laminating:
multilayer pcb bolodi, pambuyo kukwaniritsa wosachedwa kukanikiza ozizira atolankhani odulidwa kapena mphero burrs, ndiye lathyathyathya pa adzaphika mu uvuni 150 madigiri Celsius kwa maola 4, kotero kuti maganizo intraplate pang'onopang'ono kumasula ndi kupanga utomoni ndi kudzachiritsidwa , stepi ino mulibe.
5. Kufunika kuwongola mbale woonda pamene plating:
0.4 ~ 0.6mm woonda Mipikisano wosanjikiza pcb bolodi kwa dera bolodi plating ndi likutipatsa plating ikhale ya nip mayina apadera, basi plating mzere pa kopanira Feiba pa pepala, ndi kapamwamba wozungulira kwa kopanira lonse pa Fiba zingwe ali kuziluka pamodzi kuwongola kusindikizidwa matabwa madera pa wodzigudubuza kuti mbale yokutidwa sadzakhala deform. Popanda muyeso ichi, pambuyo plating microns makumi awiri kapena makumi atatu wosanjikiza mkuwa, pepala adzakhala ndichotse, ndi zovuta mankhwala.
6. Bungwe yozizira pambuyo kukhazikika mpweya wotentha:
Mpweya otentha a kusindikizidwa dera bolodi ndi anakhudzidwa ndi kutentha kwa solder ufa (pafupifupi 250 madigiri Celsius). Pambuyo atachotsedwa, ayenera atsanulidwe lathyathyathya nsangalabwi kapena zitsulo mbale kwa kuziziritsa mwachibadwa, ndiyeno makina pambuyo processing ndi cleaned.This ndi zabwino warping wa boards.Some fakitale kumapangitsanso kuwala kwa padziko kutsogolera , tini bolodi m'madzi ozizira, atangotha mpweya kukhazikika otentha pambuyo ochepa masekondi mu reprocessing, ndi malungo ngati mantha ozizira, pa mitundu ina ya matabwa zikuoneka kuti apange warping, magawo kapena blister.In komanso, mpweya akuyandama bedi akhoza zidzawonjezedwa kwa kuziziritsa zida.
7. warping gulu processing:
Ku fakitale bwino anakwanitsa bolodi adzakhala ndi 100% flatness cheke pa anayendera komaliza. Onse zosavomerezeka matabwa pcb adzakhala anatola kunja, anaika mu ng'anjo, anaphika pa 150 madigiri Celsius ndi katundu kuthamanga kwa maola 3 mpaka 6, ndi pansi mavuto kuzirala achilengedwe. Ndiye kutula mbale ndi kuchotsa pcb bolodi, mu cheke flatness, kotero kuti mbali ya bolodi angapulumuke, ndi ena matabwa kusindikizidwa dera muyenera kukhala awiri katatu pa kuphika kuti level.If tatchulawa odana -warping miyeso ndondomeko ndi sadatsatire, ena kuphika gulu chilibe ntchito, zimatayidwa yekha.