Iprofayile yeReflow engakhokhelwanga: Uhlobo lokufunxwa ngokuchasene nohlobo lokuthotywa

I-Reflow soldering yinkqubo apho i-solder paste ifudunyezwa kwaye itshintshe kwimo etyhidiweyo ukuze idibanise izikhonkwane kunye neepads ze-PCB kunye ngokusisigxina.

Kukho amanyathelo/izowuni ezine kule nkqubo - ukufudumeza kwangaphambili, ukucwina, ukugeleza kwakhona kunye nokupholisa.

Kwisiseko seprofayili yohlobo lwetrapezoidal kwisiseko seprofayile yasimahla esetyenziswa nguBittele kwinkqubo yendibano ye-SMT:

1. Indawo yokufudumeza: Ukushisa ngokuqhelekileyo kubhekisela ekunyuseni ubushushu ukusuka kwiqondo eliqhelekileyo ukuya kwi-150 ° C kwaye ukusuka kwi-150 ° C ukuya kwi-180 C. Irempu yokushisa ukusuka kwisiqhelo ukuya kwi-150 ° C ingaphantsi kwe-5 ° C / isekhondi (kwi-1.5 ° C ~ 3 ° C / umzuzwana), kwaye ixesha eliphakathi kwe-150 ° C ukuya kwi-180 ° C lijikeleze i-60 ~ 220 sec.Inzuzo yokufudumala okucothayo kukuvumela isinyibilikisi kunye namanzi kumphunga wokuncamathelisa aphume ngexesha.Ikwavumela iinxalenye ezinkulu ukuba zifudumale ngokufanayo namanye amalungu amancinci.
2. Indawo yokuntywila: Ixesha lokufudumeza ukusuka kwi-150 ° C ukuya kwindawo enyibilikisiweyo yealloy ikwabizwa ngokuba lixesha lokufunxa, okuthetha ukuba i-flux iya iqala ukusebenza kwaye isusa indawo ene-oxidized kumphezulu wesinyithi ukuze ilungele ukwenza i-solder edibeneyo. phakathi kwezikhonkwane kunye neepads zePCB.
3. Indawo yokuqukuqela kwakhona: Indawo yokuqukuqela kwakhona, ekwabizwa ngokuba “lixesha elingaphezulu kwe-liquidus” (TAL), yinxalenye yenkqubo apho ubushushu obuphezulu bufikelelwayo.Iqondo lobushushu eliqhelekileyo lingama-20–40 °C ngaphezu kolwelo.
4. Indawo yokupholisa: Kwindawo yokupholisa, iqondo lobushushu liyehla ngokuthe ngcembe kwaye lenze amalungu aqinileyo e-solder.Ubuninzi obuvumelekileyo ithambeka lokupholisa phantsi kufuneka liqwalaselwe ukuze kuthintelwe nasiphi na isiphene ukuba singenzeki.Izinga lokupholisa lika-4°C/s liyacetyiswa.

Kukho iiprofayili ezimbini ezahlukeneyo ezibandakanyekayo kwinkqubo yokubuyisela kwakhona - uhlobo lokumanzisa kunye nohlobo lokuthotywa.

Uhlobo lwe-Soaking lufana ne-trapezoidal shape ngelixa i-slumping type ine-delta shape.Ukuba ibhodi ilula kwaye akukho zixhobo ezintsonkothileyo ezifana BGAs okanye amacandelo amakhulu ebhodini, iprofayile slumping uhlobo iya kuba ukhetho olungcono.