1. Usayizi we-PCB
[Incazelo engemuva] Usayizi we-PCB unqunyelwe umthamo wezinto zomugqa wokukhiqiza wokucubungula ngogesi. Ngakho-ke, usayizi ofanele we-PCB kufanele ucatshangelwe lapho uklama uhlelo lohlelo lomkhiqizo.
(1) Ubukhulu besayizi ye-PCB engafakwa kumshini we-SMT buvela kusayizi ojwayelekile wezinto ze-PCB, eziningi zazo eziwu-20″×24″, okungukuthi, 508mm×610mm (ububanzi besitimela)
(2) Usayizi otuswayo usayizi ohambisana nezisetshenziswa zolayini wokukhiqiza we-SMT, ohambisana nokusebenza kahle kokukhiqiza kwesisetshenziswa ngasinye futhi uqeda ibhodlela lamathuluzi.
(3) Usayizi omncane we-PCB kufanele yakhelwe njengesibopho sokuthuthukisa ukusebenza kahle kokukhiqizwa kwawo wonke umugqa wokukhiqiza.
【Izidingo zokuklama】
(1) Ngokujwayelekile, ubukhulu bobukhulu be-PCB kufanele bube nomkhawulo phakathi kwebanga elingu-460mm×610mm.
(2) Ububanzi obunconywayo bukasayizi (200~250)mm×(250~350)mm, futhi ukubukeka kwesilinganiselo kufanele kube “2.
(3) Ngosayizi we-PCB “125mm×125mm, i-PCB kufanele isethelwe usayizi ofanele.
2, PCB shape
[Incazelo engemuva] Izinto zokukhiqiza ze-SMT zisebenzisa ojantshi beziqondiso ukuze zidlulisele ama-PCB, futhi azikwazi ukudlulisa ama-PCB anomumo ongajwayelekile, ikakhulukazi ama-PCB anezikhala emakhoneni.
【Izidingo zokuklama】
(1) Ukuma kwe-PCB kufanele kube isikwele esivamile esinamakhona ayindilinga.
(2) Ukuze kuqinisekiswe ukuzinza kwenqubo yokudlulisa, ukwakheka okungajwayelekile kwe-PCB kufanele kubhekwe ukuthi kuguqulwe kube isikwele esijwayelekile ngokubekwa, ikakhulukazi izikhala zekhoneni kufanele zigcwaliswe ukuze kugwenywe inqubo yokudlulisela wave soldering imihlathi Ibhodi lekhadi.
(3) Kumabhodi e-SMT amsulwa, izikhala zivunyelwe, kodwa usayizi wegebe kufanele ube ngaphansi kwengxenye eyodwa kwezintathu yobude bohlangothi lapho itholakala khona. Uma idlula lesi sidingo, uhlangothi lwenqubo yokuklama kufanele lugcwaliswe.
(4) Ngaphezu komklamo ohehayo wohlangothi olufakayo, idizayini ehehayo yomunwe osagolide kufanele futhi iklanywe ngendlela (1~1.5)×45° i-chamfering nhlangothi zombili zebhodi ukuze kube lula ukufakwa.
3. Uhlangothi lokudlulisela
[Incazelo engemuva] Usayizi wohlangothi lokudlulisa uncike ezidingweni zegayidi yokudlulisa yesisetshenziswa. Imishini yokuphrinta, imishini yokubeka kanye nezithando zomlilo ezigeleza kabusha ngokuvamile zidinga ukuthi uhlangothi oludlulisayo lube ngaphezu kuka-3.5mm.
【Izidingo zokuklama】
(1) Ukuze kuncishiswe ukuwohloka kwe-PCB ngesikhathi sokudayiswa, isiqondiso esiseceleni eside se-PCB engabekwanga ngokuvamile sisetshenziswa njengendlela yokudlulisela; nge-PCB yokufaka, isiqondiso esiseceleni eside kufanele futhi sisetshenziswe njengesiqondiso sokudlulisela.
(2) Ngokujwayelekile, izinhlangothi ezimbili ze-PCB noma isiqondiso sokudlulisa sisetshenziswa njengohlangothi lokudlulisela. Ububanzi obuncane bohlangothi lokudlulisela ngu-5.0mm. Akufanele kube khona izingxenye noma amajoyinti e-solder ngaphambili nangemuva ohlangothini lokudlulisela.
(3) Uhlangothi olungathumeli, akukho mkhawulo kumpahla ye-SMT, kungcono ukubekisa ingxenye engu-2.5mm yendawo engavunyelwe.
4, imbobo yokubeka
[Incazelo Yasemuva] Izinqubo eziningi ezinjengokucubungula ukufakwa, ukuhlanganisa, nokuhlola zidinga ukuma okunembile kwe-PCB. Ngakho-ke, ngokuvamile kuyadingeka ukuklama izimbobo zokubeka.
【Izidingo zokuklama】
(1) Ku-PCB ngayinye, kufanele kuklanywe okungenani izimbobo zokubeka ezimbili, eyodwa iyisiyingi enye ibe yisimo se-groove ende, eyokuqala isetshenziselwa ukubeka indawo bese eyakamuva isetshenziselwa ukuqondisa.
Asikho isidingo esikhethekile sembobo yokuma, ingaklanywa ngokuya ngemininingwane yefektri yakho, futhi ububanzi obunconywayo bungu-2.4mm no-3.0mm.
Izimbobo zokubeka indawo kufanele zibe yizimbobo ezingezona ezensimbi. Uma i-PCB iyi-PCB ebhontshiwe, imbobo yokumisa kufanele yakhelwe ngepuleti lembobo ukuze kuqiniswe ubulukhuni.
Ubude bembobo yomhlahlandlela ngokuvamile buphindwe izikhathi ezingu-2 ububanzi.
Isikhungo sembobo yokuma kufanele sibe ngaphezu kuka-5.0mm kude nonqenqema lokudlulisa, futhi izimbobo zokubeka ezimbili kufanele zibe kude ngangokunokwenzeka. Kunconywa ukuwahlela ekhoneni eliphambene le-PCB.
(2) Ku-PCB exubile (i-PCBA ene-plug-in efakiwe, indawo yembobo yokumisa kufanele ifane, ukuze idizayini yamathuluzi yabiwe phakathi kwangaphambili nangemuva. Isibonelo, isisekelo sesikulufu singakwazi futhi ingasetshenziselwa ithreyi ye-plug-in.
5. Uphawu lokuma
[Incazelo engemuva] Imishini yokubeka yesimanje, imishini yokunyathelisa, imishini yokuhlola i-optical inspection (AOI), okokusebenza kokuhlola ukunamathisela kwe-solder (SPI), njll. yonke isebenzisa amasistimu okubeka amehlo. Ngakho-ke, izimpawu zokuma okubonakalayo kufanele zakhelwe ku-PCB.
【Izidingo zokuklama】
(1) Izimpawu zokuma zihlukaniswe zaba yizimpawu zokuma komhlaba jikelele (I-Global Fiducial) nezimpawu zendawo zendawo (I-Fiducial yendawo). Eyangaphambili isetshenziselwa ukubeka ibhodi lonke, kanti lena yokugcina isetshenziselwa ukubeka amabhodi amancane noma izingxenye ze-fine-pitch.
(2) Uphawu lokuma kwe-optical lungaklanywa lube isikwele, indingilizi emise okwedayimane, isiphambano, i-tic-tac-toe, njll., futhi ubude bungu-2.0mm. Ngokuvamile, kunconywa ukuthi udizayine iphethini yencazelo yethusi eyindilinga engu-Ø1.0m. Ngokucabangela umehluko phakathi kombala obalulekile nendawo ezungezile, shiya indawo engadayisi ngo-1mm enkulu kunophawu lokuma kokubona. Azikho izinhlamvu ezivunyelwe ngaphakathi. Ezintathu ebhodini elifanayo Ukuba khona noma ukungabi khona kwe-foil yethusi kungqimba lwangaphakathi ngaphansi kophawu ngalunye kufanele kuhambisane.
(3) Engxenyeni ye-PCB enezingxenye ze-SMD, kunconywa ukuthi ubeke izimpawu zokubeka ezintathu ze-optical emakhoneni ebhodi ukuze kubekwe i-PCB enezinhlangothi ezintathu (amaphuzu amathathu anquma indiza, ekwazi ukubona ubukhulu be-solder. namathisela).
(4) Ukuze kubekwe, ngaphezu kwezimpawu ezintathu zokuma okubonakalayo zalo lonke ibhodi, kungcono ukudizayina izimpawu zokuma ezimbili noma ezintathu ezibekwe emakhoneni ayi-diagonal ebhodi ngalinye.
(5) Kumadivayisi afana ne-QFP anebanga eliphakathi nendawo eliholayo elingu-≤0.5mm kanye ne-BGA enebanga elimaphakathi ≤0.8mm, izimpawu zokuma kwendawo yokubona kufanele zisethwe emakhoneni ayi-diagonal ukuze kumiswe kahle.
(6) Uma kunezinsimbi ezigxunyekiwe nhlangothi zombili, kufanele kube nezimpawu zokuma ohlangothini ngalunye.
(7) Uma ingekho imbobo yokuma ku-PCB, indawo emaphakathi yophawu lokuma kwendawo kufanele ibe ngaphezu kuka-6.5mm kude nonqenqema lokudlulisela lwe-PCB. Uma kunembobo yokuma ku-PCB, indawo emaphakathi yophawu lokuma kwendawo kufanele yakhelwe eceleni kwembobo yokuma eduze nendawo emaphakathi ye-PCB.