1. Ubungakanani bePCB
【Inkcazelo yangasemva】Ubungakanani bePCBkuthintelwe ngamandla ezixhobo zomnxeba wokwenziwa kwemveliso yombane.Ke ngoko, ubungakanani obufanelekileyo bePCB kufuneka buqwalaselwe kuyilo lwesikimu senkqubo yemveliso.
(1) Obona bukhulu besayizi ye-PCB enokuthi ifakwe kwisixhobo se-SMT ithathwe kubungakanani obuqhelekileyo bephepha le-PCB, uninzi lwayo luyi-20″×24″, oko kukuthi, 508mm×610mm (ububanzi besiporo)
(2) Ubungakanani obucetyiswayo bubukhulu obuhambelanayo besixhobo ngasinye kumgca wokuvelisa we-SMT, ohambelana nokusebenza kakuhle kwemveliso yesixhobo ngasinye kunye nokupheliswa kweebhotile zezixhobo.
(3) KwiiPCB ezinobungakanani obuncinci, kufuneka ziyilwe njengento yokunyanzeliswa kokuphucula ukusebenza kakuhle kwemveliso yomgca wemveliso wonke.
【Iimfuno zoyilo】
(1) Ngokubanzi, ubungakanani obukhulu bePCB kufuneka buncitshiswe phakathi koluhlu lwe-460mm×610mm.
(2) Uluhlu lwesayizi olucetyiswayo (200 ~ 250) mm× (250 ~ 350) mm, kwaye umlinganiselo we-aspect ratio kufuneka ube <2.
(3) Kwi-PCB enobungakanani be-"125mm×125mm", kufuneka yenziwe ubungakanani obufanelekileyo.
2. Ubume bePCB
[Inkcazelo yangasemva] Izixhobo zemveliso ye-SMT zisebenzisa iintsimbi zesikhokelo ukuthutha ii-PCB, kwaye ii-PCB ezinemilo engaqhelekanga azikwazi ukuthuthwa, ngakumbi ii-PCB ezinenotshi ezikoneni.
【Iimfuno zoyilo】
(1) Imilo yePCB kufuneka ibe sisikwere esiqhelekileyo esineekona ezingqukuva.
(2) Ukuze kuqinisekiswe uzinzo lwenkqubo yothumelo, indlela yokufakwa kufuneka ithathelwe ingqalelo ukuguqula iPCB emile ngendlela engaqhelekanga ibe yimilo yesikweri esemgangathweni, ngakumbi izithuba zembombo kufuneka zizaliswe ukuphepha i-wave soldering imihlathi ngexesha lenkqubo yokuhambisa.Ibhodi yekhadi eliphakathi.
(3) Kwiibhodi ze-SMT ezicocekileyo, izikhewu zivumelekile, kodwa ubungakanani besithuba kufuneka bube ngaphantsi kwesinye kwisithathu sobude becala.Kwabo badlula le mfuneko, icala lenkqubo yoyilo kufuneka lizaliswe.
(4) Uyilo oluhexayo lomnwe wegolide alufuneki kuphela ukuyila i-chamfering kwicala lofakelo, kodwa kunye noyilo (1~1.5)×45° chamfering kumacala omabini eplagi ebhodini ukuququzelela ukufakwa.
3. Icala lothumelo
[Inkcazelo yangasemva] Ubungakanani bomda wokuhambisa buxhomekeke kwiimfuno zesikhokelo somzila kaloliwe wesixhobo.Kumatshini wokuprinta, oomatshini bokubeka kunye nezixhobo zokuphinda zifakwe kwi-solder, i-edge yokuhambisa iyimfuneko ngokubanzi ukuba ibe ngaphezu kwe-3.5mm.
【Iimfuno zoyilo】
(1) Ukuze kuncitshiswe i-deformation ye-PCB ngexesha le-soldering, icala elide le-PCB engafakwanga lisetyenziswa ngokubanzi njengesikhokelo sothumelo;Ukubekwa, icala elide kufuneka lisetyenziswe njengesikhokelo sothumelo.
(2) Ngokuqhelekileyo, amacala amabini e-PCB okanye ulwalathiso lokuhambisa lusetyenziswa njengecala lothumelo.Ubuncinci ububanzi becala lothumelo yi-5.0mm.Kufuneka kungabikho zixhobo okanye i-solder joints ngaphambili nangasemva kwecala lothumelo.
(3) Kwicala elingathumeli, akukho sithintelo kwisixhobo se-SMT, kwaye kungcono ukugcina indawo yokuthintela i-2.5mm yecandelo.
4. Umngxuma wokumisa
[Inkcazelo yangasemva] Iinkqubo ezininzi ezinjengokusetyenzwa, ukudityaniswa, kunye novavanyo zifuna ukubekwa okuchanekileyo kwePCB.Ke ngoko, imingxuma yokubeka ifuneka ngokubanzi ukuyilwa.
【Iimfuno zoyilo】
(1) KwiPCB nganye, ubuncinane imingxuma emibini yokumisa ifanele iyilwe, omnye uyilwe njengesangqa, yaye omnye uyilwe njengomsele omde.Eyangaphambili isetyenziselwa ukubeka kwaye le yokugqibela isetyenziselwa isikhokelo.
Akukho mfuneko ikhethekileyo yokuvula indawo yokubeka indawo, inokuqulunqwa ngokweenkcukacha zefektri yakho, kwaye i-diameter ekhuthazwayo yi-2.4mm kunye ne-3.0mm.
Imingxuma yokubeka iya kuba yimingxuma engeyiyo isinyithi.Ukuba i-PCB yi-PCB ehlatyiweyo, umngxuma wokumisa kufuneka uyilwe ngepleyiti yomngxuma ukomeleza ubungqongqo.
Ubude bomngxuma wesikhokelo ngokuqhelekileyo buphindwe kabini ububanzi.
Umbindi womngxuma wokumisa kufuneka ube ngaphezu kwe-5.0mm ukusuka kwicala lothumelo, kwaye imingxuma emibini yokumisa kufuneka ibe kude kangangoko.Kuyacetyiswa ukuba uzilungiselele kwiikona ezichaseneyo zePCB.
(2) Kwii-PCBs ezixubeneyo (ii-PCBA ezineplagi ezifakiweyo, indawo yemingxuma yokumisa kufuneka ifane nephambili nangasemva, ukuze uyilo lwezixhobo lunokwabelwana phakathi kwangaphambili nangasemva, njengesikrufu. isibiyeli esisezantsi sinokusetyenziselwa iplagi yetreyi.
5. Iimpawu zokumisa
[Inkcazelo yangasemva] Oomatshini bokubekwa banamhlanje, oomatshini bokushicilela, izixhobo zokuhlola amehlo (AOI), izixhobo zokuhlola i-solder paste (SPI), njl.Ke ngoko, iisimboli zokubeka i-optical kufuneka ziyilwe kwiPCB.
【Iimfuno zoyilo】
1
Fiducial).Eyangaphambili isetyenziselwa ukubeka ibhodi yonke, kwaye le yokugqibela isetyenziselwa ukubeka iibhodi ezisezantsi okanye izakhi zepitch-pitch.
(2) Iimpawu zokubeka i-Optical positioning zingayilwa njengezikwere, idayimane, izangqa, iminqamlezo, imigodi, njl., kunye nobude be-2.0mm.Ngokuqhelekileyo, kucetyiswa ukuyila iphethini yenkcazo yobhedu ejikelezayo ye-Ø1.0m.Ukuqwalasela ukungafani phakathi kombala wezinto eziphathekayo kunye nokusingqongileyo, indawo engeyiyo i-soldering 1mm enkulu kunesimboli sokumisa i-optical igcinwe, kwaye akukho zimpawu zivunyelwe kuyo.Ezintathu kwibhodi enye Ubukho okanye ukungabikho kwe-foil yobhedu kwinqanaba elingaphakathi kufuneka lifane phantsi kwesimboli.
(3) Kumphezulu we-PCB onamalungu e-SMD, kuyacetyiswa ukuba ulungelelanise iisimboli ezintathu zokubeka i-optical kwikona yebhodi yokubeka i-stereo ye-PCB (amanqaku amathathu amisela inqwelomoya, kwaye ubukhulu be-solder paste bunokubonwa) .
(4) Ukubekwa, ukongeza ekubeni neesimboli ezintathu zokubeka i-optical positioning kwibhodi iphela, kungcono ukuyila iisimboli ezimbini okanye ezintathu zokubeka i-optical positioning kwiikona ezichaseneyo zebhodi yeyunithi nganye.
(5) Kwizixhobo ezifana ne-QFP eneziko elikhokelayo lomgama we-≤0.5mm kunye ne-BGA kunye nomgama ophakathi kwe-≤0.8mm, iimpawu zendawo yokubeka i-optical positioning kufuneka zibekwe kwi-diagonal yokubeka ngokuchanekileyo.
(6) Ukuba kukho izinto ezixhonyiweyo kumacala omabini, icala ngalinye lifanele libe neesimboli zokuma okubonakalayo.
(7) Ukuba akukho mngxuma wokumisa kwi-PCB, umbindi wesimboli yokuma yamehlo kufuneka ube ngaphezu kwe-6.5mm kude necala lothumelo lwePCB.Ukuba kukho umngxuma wokumisa kwi-PCB, umbindi wesimboli yokubeka yamehlo kufuneka uyilwe kwicala lomngxuma wokumisa kufutshane nombindi we-PCB.
Ixesha lokuposa: Apr-08-2023