Ukuze ukwazi ukulawula isivinini somoya kanye nevolumu yomoya, amaphuzu amabili adinga ukunakwa:
- Isivinini se-fan kufanele silawulwe ukuguqulwa kwefrikhwensi ukunciphisa umthelela wokuguquguquka kwe-voltage kuyo;
- Nciphisa umthamo womoya wokukhipha imishini, ngoba umthwalo ophakathi wokukhipha umoya uvame ukungazinzi, okuthinta kalula ukuhamba komoya oshisayo esithandweni somlilo.
- Ukuzinza kwemishini
Ngokushesha sithole ukulungiselelwa kwejika lokushisa kwesithando somlilo, kodwa ukuze sikufeze, ukuzinza, ukuphindaphinda nokuvumelana kwezinto zokusebenza kuyadingeka ukuze kuqinisekiswe.Ikakhulukazi ekukhiqizeni okungenamthofu, uma ijika lokushisa lesithando somlilo likhukhuleka kancane ngenxa yezizathu zemishini, kulula ukugxumela ngaphandle kwefasitela lenqubo futhi kubangele ukugoqa okubandayo noma ukulimala kudivayisi yokuqala.Ngakho-ke, abakhiqizi abaningi ngokwengeziwe sebeqala ukubeka phambili izidingo zokuhlola ukuzinza kwemishini.
l Ukusetshenziswa kwe-nitrogen
Ngokufika kwenkathi yokungaholeli, ukuthi i-reflow soldering igcwele i-nitrogen sekuphenduke isihloko esishisayo sengxoxo.Ngenxa ye-fluidity, solderability, kanye nokumanzisa kwama-solder angenawo umthofu, awalungile njengama-lead solders, ikakhulukazi lapho ama-pads ebhodi lesifunda ethatha inqubo ye-OSP (i-organic protective film bare copper board), ama-pads kulula uku-oxidize, ngokuvamile okuholela ekuhlanganiseni kwe-solder I-engeli yokumanzisa inkulu kakhulu futhi iphedi ivezwe ethusi.Ukuze sithuthukise ikhwalithi yamajoyinti e-solder, ngezinye izikhathi sidinga ukusebenzisa i-nitrogen ngesikhathi sokuthuthwa kabusha kwe-solder.I-nitrogen iyigesi evikelayo engenzi lutho, engavikela amaphedi ebhodi lesifunda kusuka ku-oxidation ngesikhathi sokudayiswa, futhi ithuthukise kakhulu ukuthengiswa kwama-solder angenawo umthofu (Umfanekiso 5).
Umfanekiso 5 Ukushiselwa kwesihlangu sensimbi ngaphansi kwemvelo egcwele initrogen
Nakuba abakhiqizi abaningi bemikhiqizo ye-elekthronikhi bengayisebenzisi i-nitrogen okwesikhashana ngenxa yokucatshangelwa kwezindleko zokusebenza, ngokuthuthukiswa okuqhubekayo kwezimfuneko zekhwalithi yokudayiswa okungenayo umthofu, ukusetshenziswa kwe-nitrogen kuzovame kakhulu.Ngakho-ke, ukukhetha okungcono ukuthi nakuba i-nitrogen ingasetshenzisiwe ekukhiqizeni kwangempela okwamanje, kungcono ukushiya okokusebenza nge-interface yokugcwalisa i-nitrogen ukuze kuqinisekiswe ukuthi imishini inokuvumelana nezimo ukuze ihlangabezane nezidingo zokukhiqiza ukugcwalisa i-nitrogen esikhathini esizayo.
l Idivayisi yokupholisa ephumelelayo kanye nesistimu yokulawula i-flux
Izinga lokushisa le-soldering lokukhiqiza okungenayo umthofu liphakeme kakhulu kunalelo lomthofu, okubeka phambili izidingo eziphakeme zomsebenzi wokupholisa wemishini.Ukwengeza, izinga lokupholisa elilawulekayo elisheshayo lingenza isakhiwo esihlangene se-solder esingenamthofu sihlangane, okusiza ukuthuthukisa amandla omshini we-solder joint.Ikakhulukazi lapho sikhiqiza amabhodi wesifunda anamandla amakhulu okushisa njengezindiza ezingemuva zokuxhumana, uma sisebenzisa kuphela ukupholisa komoya, kuzoba nzima kumabhodi esekethe ukuhlangabezana nezidingo zokupholisa ze-3-5 degrees ngomzuzwana ngesikhathi sokupholisa, futhi umthambeko wokupholisa awukwazi. finyelela Isidingo sizokhulula isakhiwo esihlangene se-solder futhi sithinte ngokuqondile ukuthembeka kokuhlanganiswa kwe-solder.Ngakho-ke, ukukhiqizwa okungenayo umthofu kunconywa kakhulu ukuthi kucatshangelwe ukusetshenziswa kwemishini yokupholisa amanzi ajikeleza kabili, futhi ukuthambekela kokupholisa okokusebenza kufanele kumiswe njengokudingekayo futhi kulawuleke ngokugcwele.
I-lead-free solder paste ngokuvamile iqukethe i-flux eningi, futhi izinsalela ze-flux kulula ukuqoqa ngaphakathi kwesithando somlilo, okuthinta ukusebenza kokudlulisa ukushisa kwemishini, futhi ngezinye izikhathi ngisho nokuwela ebhodini lesifunda esithandweni somlilo ukuze kubangele ukungcola.Kunezindlela ezimbili zokukhipha izinsalela ze-flux ngesikhathi senqubo yokukhiqiza;
(1) Ukukhipha umoya
Umoya oqeda amandla kuyindlela elula yokukhipha izinsalela ze-flux.Kodwa-ke, sishilo esihlokweni esandulele ukuthi umoya wokukhipha ngokweqile uzothinta ukuzinza kokugeleza komoya oshisayo emgodini wesithando somlilo.Ngaphezu kwalokho, ukwandisa inani lokukhipha umoya kuzoholela ngokuqondile ekwandeni kokusetshenziswa kwamandla (kuhlanganise nogesi ne-nitrogen).
(2) Uhlelo lokulawula ukugeleza kwamazinga amaningi
Isistimu yokulawula i-flux ngokuvamile ihlanganisa idivayisi yokuhlunga kanye nedivayisi ebambayo (Umfanekiso 6 kanye noMfanekiso 7).Idivayisi yokuhlunga ihlukanisa kahle futhi ihlunge izinhlayiya eziqinile ezisele eziphumayo, kuyilapho idivayisi yokupholisa ifinyeza insalela yegesi egelezayo ibe uketshezi kusishintshi sokushisa, futhi ekugcineni ikuqoqe kuthreyi yokuqoqa ukuze icutshungulwe endaweni eyodwa.
Umfanekiso 6 Idivayisi yokuhlunga ohlelweni lokulawula ukugeleza
Umfanekiso 7 Idivayisi yokufingqa ohlelweni lokulawula ukugeleza
Isikhathi sokuthumela: Aug-12-2020