Ziziphi izizathu kunye nezisombululo zokuGqwethwa kwePCB?

Ukugqwethwa kwe-PCB yingxaki eqhelekileyo kwimveliso yebhetshi ye-PCBA, eya kuzisa impembelelo enkulu ekudibaneni nasekuvavanyeni.Indlela yokuphepha le ngxaki, nceda ubone ngezantsi.

Izizathu zokugqwethwa kwePCB zezi zilandelayo:

1. Ukukhetha okungafanelekanga kwezixhobo ze-PCB ekrwada, ezifana ne-T ephantsi ye-PCB, ngakumbi i-PCB esekwe kwiphepha, iqondo layo lokushisa liphezulu kakhulu, i-PCB iyajika.

2. Uyilo lwe-PCB olungafanelekanga, ukusabalalisa okungalinganiyo kwamacandelo kuya kukhokelela kuxinzelelo olugqithisileyo lwe-thermal ye-PCB, kunye nezihlanganisi kunye neesokethi ezineemilo ezinkulu ziya kuchaphazela ukwandiswa kwe-PCB kunye nokucutha, okubangela ukuphazamiseka okusisigxina.

3. Iingxaki zoyilo lwePCB, njengePCB enamacala amabini, ukuba ifoyile yobhedu kwelinye icala inkulu kakhulu, njengocingo olusemhlabeni, kunye nefoyile yobhedu kwelinye icala incinci kakhulu, iya kubangela ukushwabana okungalinganiyo kunye nokuguqulwa. amacala omabini.

4. Ukusetyenziswa ngokungafanelekanga kwefixture okanye umgama wefixture kuncinci kakhulu, okunjeumatshini wokuthambisa wamazaumnwe uzipho clamping tight kakhulu, PCB uya kwanda kunye deformation ngenxa ubushushu welding.

5. Ubushushu obuphezulu kwireflow ovenukuwelda kuya kubangela ukugqwethwa kwePCB.

Ngenxa yezi zizathu zingasentla, izisombululo zezi zilandelayo:

1. Ukuba ixabiso kunye nendawo iyakuvumela, khetha i-PCB ene-Tg ephezulu okanye yandise ubukhulu be-PCB ukufumana owona mlinganiselo ubalaseleyo.

2. Ukuyila i-PCB ngokufanelekileyo, indawo ye-foil yensimbi ephindwe kabini kufuneka ilungelelaniswe, kwaye umaleko wobhedu kufuneka ugutyungelwe apho kungekho sekethe, kwaye ubonakale ngendlela yegridi ukunyusa ukuqina kwe-PCB.

3. I-PCB ibhekwe ngaphambiliUmatshini we-SMTku-125℃/4h.

4. Lungisa i-fixture okanye umgama wokubamba ukuqinisekisa indawo yokwandiswa kokufudumeza kwe-PCB.

5. Ukushisa kwenkqubo ye-Welding ephantsi ngokusemandleni, ukuphazamiseka okuncinci kuye kwabonakala, kunokufakwa kwindawo yokubeka indawo, ukusetha kabusha kweqondo lokushisa, ukukhulula uxinzelelo, ngokubanzi iziphumo ezanelisayo ziya kufumaneka.