Sonke sithemba ukuthi inqubo ye-SMT iphelele, kodwa iqiniso liwunya.Okulandelayo ulwazi oluthile mayelana nezinkinga ezingaba khona zemikhiqizo ye-SMT kanye nezinyathelo eziphikisana nazo.
Okulandelayo, sichaza lezi zindaba ngokuningiliziwe.
1. Isenzakalo se-tombstone
I-Tombstoneng, njengoba kukhonjisiwe, kuyinkinga lapho izingxenye zeshidi ziphakama ngakolunye uhlangothi.Lesi sici singenzeka uma ukungezwani kwendawo ezinhlangothini zombili zengxenye kungalingani.
Ukuvimbela lokhu ukuthi kungenzeki, singakwazi:
- Isikhathi esikhulisiwe endaweni esebenzayo;
- Lungiselela ukwakheka kwephedi;
- Vimbela i-oxidation noma ukungcoliswa kweziphetho zengxenye;
- Linganisa imingcele yamaphrinta anamathisele we-solder nemishini yokubeka;
- Thuthukisa ukwakheka kwesifanekiso.
2. Solder ibhuloho
Lapho i-solder paste yenza ukuxhumana okungavamile phakathi kwezikhonkwane noma izingxenye, kubizwa ngokuthi ibhuloho le-solder.
Izinyathelo zokulwa zihlanganisa:
- Linganisa iphrinta ukuze ulawule umumo wokuphrinta;
- Sebenzisa i-solder paste ene-viscosity efanele;
- Ukuthuthukisa imbobo kusifanekiso;
- Lungiselela imishini yokukhetha nokubeka ukuze ulungise indawo futhi usebenzise ingcindezi.
3. Izingxenye ezilimele
Izingxenye zingase zibe nemifantu uma zilimele njengempahla eluhlaza noma ngesikhathi sokubekwa nokugeleza kabusha
Ukuze uvimbele le nkinga:
- Hlola futhi ulahle izinto ezilimele;
- Gwema ukuthintana okungamanga phakathi kwezingxenye nemishini ngesikhathi sokucutshungulwa kwe-SMT;
- Lawula izinga lokupholisa elingaphansi kuka-4°C ngomzuzwana.
4. umonakalo
Uma izikhonkwane zonakalisiwe, zizophakamisa amaphedi futhi ingxenye ingase ingadayisi kuma-pads.
Ukuze sigweme lokhu, kufanele:
- Hlola impahla ukuze ulahle izingxenye ngezikhonkwane ezimbi;
- Hlola izingxenye ezibekwe mathupha ngaphambi kokuzithumela enqubweni yokugeleza kabusha.
5. Ukuma okungalungile noma ukuma kwezingxenye
Le nkinga ifaka phakathi izimo ezimbalwa ezifana nokungaqondani kahle noma umumo ongalungile/i-polarity lapho izingxenye zishiselwe khona ngezindlela eziphambene.
Izinyathelo zokulwa:
- Ukulungiswa kwemingcele yomshini wokubeka;
- Hlola izingxenye ezibekwe ngesandla;
- Gwema amaphutha okuxhumana ngaphambi kokufaka inqubo yokugeleza kabusha;
- Lungisa ukugeleza komoya ngesikhathi sokugeleza kabusha, okungase kuphephule ingxenye isuke endaweni yayo efanele.
6. Inkinga yokunamathisela i-solder
Isithombe sibonisa izimo ezintathu ezihlobene nevolumu yokunamathisela ye-solder:
(1) I-solder eyeqile
(2) I-solder enganele
(3) Akukho solder.
Kunezici ezi-3 ezidala inkinga.
I-1) Okokuqala, izimbobo zesifanekiso zingavinjelwa noma zingalungile.
2) Okwesibili, i-viscosity ye-solder paste ingase ingalungile.
I-3) Okwesithathu, ukungahambi kahle kwe-solderability yezingxenye noma ama-pads kungase kubangele ukunganele noma ukungabikho kwe-solder.
Izinyathelo zokulwa:
- isifanekiso esihlanzekile;
- Qinisekisa ukuqondanisa okujwayelekile kwezifanekiso;
- Ukulawula okunembile kwevolumu yokunamathisela ye-solder;
- Lahla izingxenye noma amaphedi ane-solderability ephansi.
7. Amalunga e-solder angavamile
Uma ezinye izinyathelo ze-solder zingahambi kahle, amalunga e-solder azokwakha izimo ezihlukile nezingalindelekile.
Izimbobo zestencil ezingacacile zingase zibangele (1) amabhola e-solder.
I-oxidation yamaphedi noma izingxenye, isikhathi esinganele esigabeni sokucwilisa kanye nokukhuphuka ngokushesha kwezinga lokushisa lokugeleza kabusha kungabangela amabhola e-solder kanye (2) nezimbobo ze-solder, izinga lokushisa eliphansi le-solder kanye nesikhathi esifushane sokushisa kungabangela (3) ama-icicles e-solder.
Izinyathelo zokulwa zimi kanje:
- isifanekiso esihlanzekile;
- Ukubhaka ama-PCB ngaphambi kokucubungula kwe-SMT ukugwema i-oxidation;
- Lungisa kahle izinga lokushisa ngesikhathi senqubo yokushisela.
Okungenhla yizinkinga ezijwayelekile zekhwalithi nezisombululo eziphakanyiswe umkhiqizi we-reflow soldering we-Chengyuan Industry kunqubo ye-SMT.Ngethemba ukuthi kuzoba usizo kuwe.
Isikhathi sokuthumela: May-17-2023