Zeziphi iimeko ekufuneka iPCB eQuquzeleyo iDibane nayo?

Kwinkqubo ye-SMT, ii-substrates ze-PCB ngaphambi kokuba kuqale ukusetyenzwa, i-PCB iya kujongwa kwaye ivavanywe, ikhethwe ukuhlangabezana neemfuno zemveliso ye-SMT ye-PCB, kunye nabangenakufaneleka babuyiselwe kumthengisi we-PCB, iimfuno ezithile ze-PCB zinokubhekiswa kuyo. IPc-a-610c International Electronics Industry Assembly Standards, ezi zilandelayo zezinye zeemfuno ezisisiseko ze-SMT processing ye-PCB.

1. I-PCB kufuneka ibe mcaba kwaye igudileyo

Iimfuno ze-PCB ngokubanzi zisicaba kwaye zigudileyo, azikwazi ukujika, okanye kwi-solder paste yoshicilelo kunye nokubekwa komatshini we-SMT kuya kuvelisa umonakalo omkhulu, njengeziphumo zeentanda.

2. I-thermal conductivity

Kumatshini we-reflow we-solder kunye nomatshini we-wave soldering, kuya kubakho indawo yokutshisa, ngokuqhelekileyo ukufudumeza i-PCB ngokulinganayo, kunye nobushushu obuthile, ngcono ukuqhutyelwa kwe-thermal ye-substrate ye-PCB, ivelise okubi kakhulu.

3. Ukumelana nobushushu

Ngophuhliso lwenkqubo ye-SMT kunye neemfuno zokusingqongileyo, inkqubo engahlawulelwayo iye yasetyenziswa ngokubanzi, kodwa ikwabangelwa kukunyuka kobushushu be-welding, ukuxhathisa ubushushu be-PCB yeemfuno eziphezulu, inkqubo engenalo ukhokelo kwi-reflow soldering, ubushushu kufuneka ukufikelela 217 ~ 245 ℃, ixesha lihlala 30 ~ 65s, ngoko ke ukuxhathisa ubushushu PCB jikelele ukuya 260 degrees Celsius, kwaye yokugqibela iimfuno 10s.

4. Ukubambelela kwi-foil yobhedu

Amandla okudibanisa i-foil yobhedu kufuneka afikelele kwi-1.5kg / cm² ukukhusela i-PCB ekuweni ngenxa yamandla angaphandle.

5. Ukugoba imigangatho

I-PCB inemigangatho ethile yokugoba, ngokubanzi ukufikelela ngaphezu kwe-25kg/mm

6. Ukuqhuba kakuhle kombane

I-PCB njengomphathi wamacandelo e-elektroniki, ukuphumeza ikhonkco phakathi kwamacandelo, ukuthembela kwimigca ye-PCB ukuba iqhube, i-PCB ayifanele ibe ne-conductivity elungileyo yombane, kunye nemigca ye-PCB eyaphukileyo ayinakubamba ngokuthe ngqo, okanye ukusebenza kwayo yonke imveliso. kuya kubangela impembelelo enkulu.

7. Inokumelana nokuhlanjwa kwe-solvent

PCB kwimveliso, lula ukuba mdaka, ngokufuthi kufuneka ukuhlamba amanzi ebhodini kunye nezinye izinyibilikisi ukucoca, ngoko ke PCB kufuneka ibe nako ukumelana ukuhlamba isinyibilikisi, ngaphandle ukuvelisa amaqamza kunye nezinye reactions ezibi.

Ezi zezinye zeemfuno ezisisiseko ze-PCB esemgangathweni ekusetyenzweni kwe-SMT.