- Kungani udinga ukwenza iphaneli?
Ngemva komklamo we-PCB, i-SMT kufanele ifakwe kulayini wokuhlanganisa ukuze inamathisele izingxenye. Ngokwezidingo zokucubungula zomugqa wokuhlanganisa, yonke imboni yokucubungula ye-SMT izocacisa usayizi ofanele kakhulu webhodi lesifunda. Isibonelo, uma ubukhulu buncane kakhulu noma bukhulu kakhulu, ukulungiswa kokulungisa i-pcb kulayini womhlangano awukwazi ukulungiswa.
Ngakho-ke uma usayizi we-PCB yethu uqobo mncane kunosayizi oshiwo efekthri? Lokho kusho ukuthi sidinga ukuhlanganisa amabhodi esekethe, amabhodi esekethe amaningi abe ucezu olulodwa.Kokubili okokukhweza okuphakeme - isivinini kanye ne-wave soldering kungathuthukisa kakhulu ukusebenza kahle.
2.Iphaneli Umfanekiso
1) Usayizi wohlaka
A. Ukuze kube lula ukucutshungulwa, unqenqema lwe-veneer of voids noma inqubo kufanele ibe ngu-R chamfering, ngokuvamile oyindilinga Φ ububanzi 5, ipuleti elincane lingalungiswa.
B. I-PCB enosayizi webhodi elilodwa ngaphansi kuka-100mm×70mm izohlanganiswa
2) Ukuma Okungajwayelekile kwe-PCB
I-PCB enomumo ongajwayelekile futhi alikho ibhodi lephaneli okufanele lifakwe ngomugqa wamathuluzi. Uma kunembobo ku-PCB enkulu noma elingana no-5mm×5mm, imbobo kufanele igcwaliswe kuqala ekwakhiweni ukuze kugwenywe ukuwohloka kwe-mantineer nepuleti ngesikhathi sokushisela. Ingxenye eqediwe kanye nengxenye yokuqala ye-PCB kufanele ixhunywe ngamaphuzu amaningana ohlangothini olulodwa futhi isuswe ngemva kokuhlanganisa igagasi.
Uma uxhumano phakathi komugqa wamathuluzi kanye ne-PCB kuwumsele omise oku-v, ibanga eliphakathi konqenqema olungaphandle lwensiza kanye nomsele omise okwe-v ngu-≥2mm;Lapho uxhumano phakathi konqenqema lwenqubo ne-PCB kuyimbobo yesitembu, ayikho idivayisi. noma isekethe izohlelwa ngaphakathi kwe-2mm yembobo yesitembu.
3. Iphaneli
Isiqondiso sephaneli sizoklanywa ngokuhambisana nesiqondiso sonqenqema lokudluliswa, ngaphandle kwalapho usayizi ungeke ukwazi ukuhlangabezana nezidingo zosayizi ongenhla wephaneli. Ngokuvamile kudingeka ukuthi inombolo ye-“v-cut” noma Imigqa yembobo yesitembu ingaphansi noma ilingana no-3 (ngaphandle kwamabhodi angawodwa amade namancane).
Ebhodini elimise okukhethekile, qaphela ukuxhumana phakathi kwebhodi elincane kanye nebhodi elincane, zama ukwenza uxhumano lwesinyathelo ngasinye sihlukaniswe emgqeni.
4.Amanothi athile ephaneli ye-PCB
Ngokuvamile, ukukhiqizwa kwe-PCB kuzokwenza lokho okubizwa ngokuthi ukusebenza kwe-Panelization ukuze kwandiswe ukusebenza kahle kokukhiqizwa komugqa wokukhiqiza we-SMT. Imiphi imininingwane okufanele inakwe emhlanganweni we-PCB? Sicela uhlole lezo njengoba ngezansi:
1) Ifreyimu yangaphandle (i-clamping edge) yephaneli ye-PCB izoklanywa ibe yiluphu evaliwe ukuze kuqinisekiswe ukuthi iphaneli ye-PCB ngeke ishintshe uma igxilile ku-fixture.
2) Umumo wephaneli ye-PCB udinga ukuskwele ngokuseduze ngangokunokwenzeka , Kunconywa ukusebenzisa iphaneli engu-2×2, 3×3,……, kodwa akukho ukwenza ibhodi elihlukile ( yin-yang).
3) Ububanzi bosayizi wePhaneli ≤260mm (umugqa we-SIEMENS) noma ≤300mm (umugqa we-FUJI). Uma isidingo sokukhipha okuzenzakalelayo, ububanzi x ubude ≤125mm×180mm ngosayizi wephaneli.
4) Ibhodi ngalinye elincane kuphaneli ye-PCB kufanele okungenani libe nezimbobo zamathuluzi ezintathu, 3≤ ububanzi bembobo ≤ 6mm, izintambo noma i-SMT ayivunyelwe ngaphakathi kuka-1mm wembobo yamathuluzi onqenqemeni.
5) Ibanga eliphakathi nendawo phakathi kwebhodi elincane kufanele lilawulwe phakathi kuka-75mm no-145mm.
I-6) Uma usetha imbobo yamathuluzi ereferensi, kuvamile ukushiya indawo yokushisela evulekile engu-1.5mm enkulu eduze kwembobo yamathuluzi.
7) Akufanele kube namadivaysi amakhulu noma amadivaysi aphumayo eduze kwendawo yokuxhuma phakathi kohlaka lwangaphandle lwephaneli nephaneli yangaphakathi, naphakathi kwephaneli nephaneli. Ngaphandle kwalokho, kufanele kube nesikhala esingaphezu kuka-0.5mm phakathi kwezingxenye kanye nomphetho webhodi le-PCB ukuze kuqinisekiswe ukusebenza okuvamile kwethuluzi lokusika.
8) Izimbobo ezine zamathuluzi ezinobubanzi bembobo engu-4mm±0.01mm zavulwa emagumbini amane ohlaka lwangaphandle lwephaneli. ipuleti;Imbobo nokunemba kwesikhundla kufanele kube phezulu, udonga lwembobo bushelelezi ngaphandle kwe-burr.
9) Empeleni, i-QFP enezikhala ezingaphansi kuka-0.65mm kufanele isethwe endaweni yayo edayagonali.Izimpawu zokuma zereferensi ezisetshenziswa ebhodini elincane le-PCB lomhlangano zizosetshenziswa ngababili, zihlelwe ngokudayagonali ezintweni zokuma.
I-10) Izingxenye ezinkulu zizoba nezikhala zokuma noma izimbobo zokubeka, njengesixhumi esibonakalayo se-I/O, umbhobho, isixhumi esibonakalayo sebhethri, i-microswitch, i-headphone jack, motor, njll.