Zinthu zomwe zikukhudza Kutenthetsa kosagwirizana kwa solder wopanda lead

Zifukwa zazikulu zotenthetsera m'mphepete mwa zigawo za SMT lead-free reflow soldering process ndi: lead-free reflow soldering product load, conveyor lamba kapena chotenthetsera m'mphepete chikoka, ndi kusiyana kwa kutentha kutentha kapena mayamwidwe kutentha kwa lead-free reflow soldering zigawo.

①Kukhudzika kwa kuchuluka kwazinthu zotsitsa.Kusintha kwa piritsi la kutentha kwa solder-free reflow soldering kuyenera kulingalira za kupeza kubwereza kwabwino popanda katundu, katundu ndi zinthu zosiyanasiyana zolemetsa.Chinthu cholemetsa chimatanthauzidwa ngati: LF = L / (L + S);pamene L=utali wa gawo laling'ono losonkhanitsidwa ndi S=mpakapata pakati pa magawo osonkhanitsidwa.

②Mu uvuni wa reflow wopanda lead, lamba wotumizira amakhalanso njira yochepetsera kutentha kwinaku akunyamula zinthu mobwerezabwereza kuti ziwonjezeke popanda lead.Kuonjezera apo, kutentha kwa kutentha kumakhala kosiyana m'mphepete ndi pakati pa gawo lotentha, ndipo kutentha m'mphepete kumakhala kochepa.Kuphatikiza pa zofunikira zosiyanasiyana za kutentha kwa dera lililonse la kutentha mu ng'anjo, kutentha pamtunda womwewo ndi wosiyana.

③ Nthawi zambiri, PLCC ndi QFP zimakhala ndi kutentha kwakukulu kuposa kagawo kakang'ono ka chip, ndipo ndizovuta kuwotcherera zigawo zazikuluzikulu kuposa zing'onozing'ono.

Kuti mupeze zotsatira zobwerezabwereza mu ndondomeko ya soldering yopanda-lead reflow soldering, kukula kwa katundu, kumakhala kovuta kwambiri.Nthawi zambiri kuchuluka kwazinthu zamavuni othamangitsidwa opanda lead kumachokera ku 0.5-0.9.Izi zimatengera momwe zinthu ziliri (kachulukidwe kagawo ka soldering, magawo osiyanasiyana) ndi mitundu yosiyanasiyana ya ng'anjo za reflow.Kuti mupeze zotsatira zabwino zowotcherera ndikubwerezabwereza, zokumana nazo zofunikira ndizofunikira.