Izinto ezibonakalayo：26199
I-MSL: I-MSL sisifinyezo senqanaba lokufuma, okuthetha ukuba inqanaba lokufuma. I-MSL icetyiswa ukubonelela ngomgangatho wokuhlelwa kokupakishwa kwezinto ze-SMD ezinokufuma, ukuze iindidi ezahlukeneyo zezinto zingafakwa, zigcinwe kwaye ziphathwe ngokuchanekileyo, neengozi zinokuthintelwa ngexesha lendibano okanye lokulungiswa.
Ngokubanzi, i-IC, i-colloid okanye i-Substrate PCB iya kufunxa ukufuma kwindawo eqhelekileyo, ikhokelela kwi "popcorn" (POPCORN) xa i-IC ihamba kwi-SMT reflow salering. Inqanaba lokufuma (MSL) lisetyenziselwa ukuchaza inqanaba le-IC ngokubhekisele ukufuma kunye nobomi beshelf. Ukuba i-IC igqitha ubomi beshelf, Akukho siqinisekiso sokuba ayizukufunxa ukufuma okuninzi kwaye ibangele i-POOPCORN ngexesha lokuphinda kwe-SMT. Ke ngoko, phaka i-IC ngaphaya kobomi beshelf.
Inkqubo yokumisela i-MSL yile:
(1) Yenza i-SAT kwimveliso entle ye-IC ukuqinisekisa ukuba akukho mdlalo.
(2) Bika i-IC ukususa ngokupheleleyo ukufuma.
(3) Ukufuma ngokwenqanaba le-MSL.
(4) Ukudlulisa i-IR-Reflow amatyeli ama-3 (indibano ye-IC ye-analog, ukuchithwa kolondo, ukulondolozwa kunye nendibano).
(5) Uhlolo lwe-SAT lwe-delamination kunye nomsebenzi wovavanyo lwe-IC.
Ukuba inokudlula lo mvavanyo ongentla, kuthetha ukuba iphakheji ye-IC ihlangana nenqanaba le-MSL.
Ukuhlelwa kwe-MSL kunamanqanaba ayi-8, ngolu hlobo lulandelayo:
Iklasi 1 - Ngaphantsi okanye ilingana ne-30 ° C / 85% RH engapheliyo i-workshop yobomi
Iklasi 2 - Ngaphantsi okanye ilingana ne-30 ° C / 60% RH yobomi bosebenziso unyaka omnye
Iklasi 2a-Ngaphantsi okanye ilingana ne-30 ° C / 60% RH iveki ezine
Iklasi 3 - Ngaphantsi okanye ilingana ne-30 ° C / 60% RH 168 iiyure zomsebenzisi
Iklasi 4 - Ngaphantsi okanye ilingana ne-30 ° C / 60% RH 72 yeeyure zomsebenzisi
Iklasi 5-Ngaphantsi okanye ilingana ne-30 ° C / 60% RH 48 yeeyure zomsebenzisi
Iklasi 5a
Iklasi 6-Ngaphantsi okanye ilingana ne-30 ° C / 60% RH 72 iiyure zobomi bomgangatho (kwiklasi 6, izinto kufuneka zibhakwe ngaphambi kokusetyenziswa kwaye kufuneka liphinde liphuculwe ngaphakathi kwexesha elichaziweyo kwiLebhile yoBumvu yoKuma)
Ukufuma akukhawulezisa kuphela umonakalo wezinto ze-elektroniki, kodwa kunye nefuthe elikhulu kwizinto ngexesha lenkqubo yokuthengisa. Kungenxa yokuba icandelo lokuthengisa kumgca wemveliso wemveliso lwenziwa kubushushu obuphezulu ngokuthengisa amaza okanye ukuphinda kwakhona kwaye ngokuzenzekelayo ngokulingana ipment. Igqityiwe Xa izinto zilungiswe kwibhodi ye-PCB, ukufudumeza ngokukhawuleza kokuphinda kwakhona kuya kudala uxinzelelo ngaphakathi kwezinto. Ngenxa ye-coefficient eyahlukeneyo yokwandiswa kobushushu (CTE) yezinto ezahlukeneyo zolwakhiwo lwephakheji, inokubangela uxinzelelo lokuba iphakheji yecandelo ayinakunyamezela.
Xa izixhobo zivezwa ngokutsha, ukufuma ngaphakathi kwezinto ze-SMD kunokuvelisa uxinzelelo olwaneleyo lomphunga ukonakalisa okanye ukutshabalalisa izinto ngenxa yokunyuka kobushushu obushushu esingqongileyo. Iimeko eziqhelekileyo zibandakanya ukwahlulwa kweplastiki (ukuthotywa) ngaphakathi kwechip okanye isakhelo esikhokelo, umonakalo wocingo lwegolide, Umonakalo wechip, kunye nokuqhekeka ngaphakathi kwecandelo (akubonakali kumphezulu wecandelo. Kwezinye iimeko ezigqithisileyo, ukuqhekeka kunokwabela phezulu kwecandelo, kwaye kwiimeko ezinzima, izixhobo ze-bulges kunye neepops (ezibizwa ngokuba yi "popcorn". Nangona inani elincinci lokufuma lamkelekile kwi-180 ° C ukuya ku-200 ° C ngexesha lokuphinda kwenziwe umsebenzi wokuthengisa, nabuphi na ubukho bokufuma kwiinkqubo ezingenalo lithethe kuluhlu lwama-230 ° C ukuya kuma-260 ° C lunokwenza ngokwaneleyo ukubangela umonakalo kulo iphakethe. Ukuqhushumba okuncinci (ifana nepopcorn) okanye imileko yezinto. Ke ngoko, kuyimfuneko ukukhetha izixhobo zokupakisha zobulumko, ukulawula ngononophelo imeko yendibano, kwaye kwamkela amanyathelo afana nokutywina ukupakishwa kunye nokubeka i-desiccant ngexesha lothutho. Ngapha koko, amazwe angaphandle ahlala esebenzisa iinkqubo zokulandela umkhondo wokufuma ezixhotyiswe iithegi zokuhamba kanomathotholo, iiyunithi zolawulo lwasekhaya kunye nesoftware ekhethekileyo ukubonisa nokulawula ukufuma kokupakisha, imigca yovavanyo, kwezothutho / ukusebenza kunye nokusebenza kwendibano ngexesha lokwenyani.
