Imishini yokukhiqiza ye-SMT izenzakalelayo ngokuphelele, ukucacisa okuphezulu, isivinini esikhulu, ukusebenza kahle kakhulu nokunye. PCB Umklamo kumele uhlangabezane nezidingo zemishini ye-SMT. Izidingo zokuklanywa kwemishini yokukhiqiza ye-SMT zifaka: ukuma kwe-PCB, usayizi, imbobo yokubeka nendawo enqenqemeni, ireferensi kaMark, ibhodi lokuhlanganisa, ukukhethwa kwento yokupakisha nefomu lokupakisha, ifayili lokukhipha i-PCB, njll.

Lapho ukuklama PCB, ukuma PCB kufanele kubhekwe kuqala. When ubukhulu be-PCB bukhulu kakhulu, ulayini ophrintiwe mude, impedance iyanda, ikhono lokulwa nomsindo liyancipha, futhi izindleko ziyanda. Mncane kakhulu, ukushabalalisa ukushisa akukuhle, futhi imigqa esondelene nayo kungenzeka iphazanyiswe. Ngasikhathi sinye, ukunemba nokucaciswa kwe-PCB shape dimension kuthinta ngqo ukwenziwa kanye nomnotho wokukhiqiza nokucutshungulwa. Okuqukethwe okuyinhloko kwe-PCB shape design kungokulandelayo.

(1) Ubude besilinganiso sobubanzi besilinganiso

Ukuma kwebhodi eliphrintiwe kufanele kube lula ngangokunokwenzeka, ngokuvamile okuyi-rectangular, ubude nobubanzi be-3: 2 noma 4: 3, ubukhulu bayo kufanele bube seduze nosayizi ojwayelekile wochungechunge, ukuze kube lula ukucubungula ubuciko, ukunciphisa izindleko zokucubungula. Ubuso bebhodi akufanele benziwe bukhulu kakhulu, ukuze bungabangeli ukusonteka lapho uvula kabusha i-welding. Usayizi nokushuba kwebhodi kufanele kufane, i-PCB encane, usayizi webhodi akufanele ube mkhulu kakhulu.

Yiziphi izidingo ze-PCB design yemishini yokukhiqiza ye-SMT

(2) PCB ukuma

Ukuma kwe-PCB nosayizi kunqunywa ngemodi yokudlulisa ye-PCB nobubanzi obukhuphukayo bomshini wokufaka.

① Lapho i-PCB ibekwe ebhentshini lomsebenzi wokufaka futhi idluliswa ebhentshini lomsebenzi, ayikho imfuneko ekhethekile yokubonakala kwe-PCB.

② Lapho i-PCB idluliswa ngqo ngesitimela, isimo se-PCB kufanele siqonde. Uma kuyi-PCB enamaphrofayili, umkhawulo wenqubo kumele wakhelwe ukuze ingaphandle le-PCB lenze umugqa oqondile, njengoba kukhonjisiwe ku-Figure 5-80.

③ Umfanekiso 5-81 ukhombisa ama-PCB amakhona ayindilinga noma ama-45. Umdwebo we-Chamfering. Ekuklanyweni komumo we-PCB, kungcono ukucubungula i-PCB emakhoneni ayindilinga noma ku-45. I-Chamfer ukuvimbela ukulimala kwe-Angle ebukhali ku-PCB conveyor belt (fibre belt).

(3) usayizi PCB design

Usayizi we-PCB unqunywa ngobubanzi obukhuphukayo. Lapho kuklanywa i-PCB, kuyadingeka ukuthi ubheke usayizi wokukala ophakeme nobuncane bomshini wokufaka. Usayizi omkhulu we-PCB = usayizi wokufaka ophakeme womshini wokufaka; Usayizi omncane we-PCB = usayizi omncane wokufaka womshini wokufaka. Ububanzi bokufakwa kwezinhlobo ezahlukene zemishini yokufaka buhlukile. Lapho usayizi we-PCB uncane kunosayizi omncane wokufaka, ibhodi kufanele lisetshenziswe.

(4) PCB ukujiya design

Ngokuvamile, ukushuba kwepuleti okuvunyelwe ngumshini wokufaka kungu-0.5 ~ Smm. The ukushuba PCB ngokuvamile uhla 0.5-2mm.

Assemb Hlanganisa kuphela amasekethe ahlanganisiwe, ama-transistors anamandla aphansi, ama-resistors, ama-capacitors nezinye izinto ezinamandla aphansi, lapho kungekho zimo ezinamandla zokuthintwa komthwalo, ubukhulu be-PCB ngaphakathi kwe-500mmx500mm, ukusetshenziswa kobukhulu be-1.6mm.

② Ngaphansi kwesimo sokudlidlizela umthwalo, ubukhulu bepuleti bungancishiswa noma iphuzu lokusekela lingaqiniswa noma lenyuswe, futhi ubukhulu be-1.6mm busengasetshenziswa.

③ Lapho ipuleti likhulu noma lingakwazi ukusekela, kufanele kukhethwe ipuleti elijiyile elingu-2-3mm.