Iphrofayela Yokugeleza Kabusha engenamthofu: Uhlobo lokucwiliswa emanzini uma luqhathaniswa nohlobo lwe-slumping

I-Reflow soldering iyinqubo lapho unamathisele we-solder ushisisa futhi ushintshela esimweni esincibilikisiwe ukuze kuxhunywe izikhonkwane zezingxenye namaphedi e-PCB ndawonye unomphela.

Kunezinyathelo/izindawo ezine kule nqubo - ukushisa kuqala, ukucwiliswa emanzini, ukugeleza kabusha nokupholisa.

Okwesisekelo sephrofayili yohlobo lwe-trapezoidal yendabuko ekunamathiseleni kwe-solder yamahhala okusetshenziselwa u-Bittele ngenqubo yomhlangano we-SMT:

1. Indawo yokushisa: Ukushisa kuqala ngokuvamile kubhekisela ekwandiseni izinga lokushisa lisuka ku-150 ° C liye ku-150 ° C liye ku-180 C. Irempu yokushisa isuka evamile iye ku-150 ° C ingaphansi kuka-5 ° C / sec (ku-1.5 ° C ~ 3 ° C / umzuzwana), futhi isikhathi esiphakathi kuka-150 ° C kuya ku-180 ° C sizungeze 60 ~ 220 sec.Inzuzo yokufudumala kancane ukuvumela i-solvent namanzi ku-vapor wokunamathisela ukuthi kuphume ngesikhathi.Iphinde ivumele izingxenye ezinkulu zishise ngokufanayo nezinye izingxenye ezincane.
2. Indawo yokucwiliswa: Isikhathi sokushisisa kuqala sisuka ku-150 ° C siye endaweni encibilikisiwe yengxubevange saziwa nangokuthi isikhathi sokucwiliswa, okusho ukuthi i-flux iqala ukusebenza futhi isusa indawo ene-oxidized endaweni yensimbi ukuze ilungele ukwenza i-solder enhle. phakathi kwezikhonkwane zezingxenye namaphedi e-PCB.
3. Indawo yokugeleza kabusha: Indawo yokugeleza kabusha, ebizwa nangokuthi “isikhathi esingaphezu kwe-liquidius” (TAL), ingxenye yenqubo lapho izinga lokushisa eliphezulu lifinyelelwa khona.Izinga lokushisa eliphakeme elijwayelekile lingu-20-40 °C ngaphezu kwe-liquidus.
4. Indawo yokupholisa: Endaweni yokupholisa, izinga lokushisa liyehla kancane kancane futhi lenze amajoyinti aqinile e-solder.Ubukhulu bomthambeka wokupholisa phansi obuvumelekile budinga ukucatshangelwa ukuze kugwenywe noma yikuphi ukonakala ukuthi kungenzeki.Izinga lokupholisa elingu-4°C/s liyanconywa.

Kunamaphrofayili amabili ahlukene abandakanyeka enqubweni yokugeleza kabusha - uhlobo lokucwiliswa kanye nohlobo lokuwa.

Uhlobo lwe-Soaking lufana nesimo se-trapezoidal kuyilapho uhlobo oludilikayo lunomumo we-delta.Uma ibhodi lilula futhi zingekho izingxenye eziyinkimbinkimbi ezifana nama-BGA noma izingxenye ezinkulu ebhodini, iphrofayili yohlobo lwe-slumping iyoba yisinqumo esingcono.