01
Kungani puzzle
Ngemuva kokuthi ibhodi lesifunda seliklanywe, umugqa wokuhlanganisa isichibi se-SMT udinga ukunamathiselwa ezingxenyeni.Imboni ngayinye yokucubungula i-SMT izocacisa usayizi ofaneleka kakhulu webhodi lesifunda ngokuvumelana nezidingo zokucubungula zomugqa womhlangano.Isibonelo, ubukhulu buncane kakhulu noma bukhulu kakhulu, futhi umugqa womhlangano ulungisiwe.Ithuluzi lebhodi lesifunda alikwazi ukulungiswa.Ngakho-ke umbuzo uwukuthi, yini okufanele siyenze uma usayizi webhodi lethu lesifunda lincane kunosayizi oshiwo efektri?Okusho ukuthi, sidinga ukuhlanganisa ibhodi lesifunda futhi sibeke amabhodi amaningi wesifunda sibe yingxenye eyodwa.Ukufakwa kungathuthukisa kakhulu ukusebenza kahle kwayo yomibili imishini yokubeka enesivinini esikhulu kanye ne-wave soldering.
02
Uhlu lwamagama
Ngaphambi kokuchaza indlela yokusebenza ngokuningiliziwe ngezansi, qala uchaze amagama ambalwa abalulekile
Maka iphuzu: njengoba kukhonjisiwe kuMfanekiso 2.1,
Isetshenziselwa ukusiza ukuma kwe-optical yomshini wokubeka.Okungenani kukhona amaphoyinti amabili ereferensi angalinganisi ku-diagonal yebhodi le-PCB elinedivayisi yokuchibiyela.Amaphoyinti ereferensi wokuma kokubona kwayo yonke i-PCB ngokuvamile asendaweni ehambisanayo kudiagonali ye-PCB yonke;ukuma kwe-optical ye-PCB ehlukanisiwe Iphoyinti lereferensi ngokuvamile lisendaweni ehambisanayo ku-diagonal ye-sub-block PCB;ku-QFP (iphakethe le-quad flat) eline-lead pitch ≤0.5mm kanye ne-BGA (iphakheji yohlu lwegridi yebhola) ene-pitch yebhola ≤0.8mm, ukuze kuthuthukiswe ukunemba kokubeka, kuyadingeka Setha indawo yesithenjwa emakhoneni amabili aphambene i-IC
Izidingo zebhentshimakhi:
a.Ukuma okuthandwayo kwephoyinti lokubhekisela kuyindilinga eqinile;
b.Ubukhulu bephoyinti lereferensi buyi-1.0 +0.05mm ububanzi
c.Iphoyinti lereferensi libekwe phakathi kwebanga le-PCB elisebenzayo, futhi ibanga eliphakathi nendawo likhulu kuno-6mm ukusuka onqenqemeni lwebhodi;
d.Ukuze kuqinisekiswe umphumela wokuqashelwa kokuphrinta nokuchibiyela, akumele kube namanye amamaki esikrini sikasilika, amaphedi, ama-V-grooves, izimbobo zezitembu, izikhala zebhodi le-PCB kanye nezintambo ngaphakathi kuka-2mm eduze konqenqema lwe-fiducial mark;
e.Iphedi yereferensi nemaski ye-solder isethwe ngendlela efanele.
Ngokucabangela umehluko phakathi kombala wezinto ezibonakalayo nendawo ezungezile, shiya indawo engadayisi ngo-1 mm enkulu kunophawu lwereferensi yokuma kokubona, futhi azikho izinhlamvu ezivunyelwe.Akudingekile ukuklama indandatho yokuvikela yensimbi ngaphandle kwendawo engadayisi.