- Waa maxay sababta loo baahan yahay in la sameeyo guddiga?
Naqshadaynta PCB ka dib, SMT waa in lagu rakibaa khadka isku xirka si loogu dhejiyo qaybaha. Marka loo eego shuruudaha habaynta ee khadka golaha, warshad kasta oo farsamaynta SMT waxay cayimi doontaa cabbirka ugu habboon ee guddiga wareegga. Tusaale ahaan, haddii cabbirku aad u yar yahay ama aad u weyn yahay, qalabka lagu hagaajinayo pcb ee khadka shirarka lama hagaajin karo.
Haddaba haddii cabbirka PCB-ga laftiisa uu ka yar yahay cabbirka ay warshaddu sheegtay? Taas macnaheedu waa in aan u baahanahay in aan wada jirno looxyada wareegga, looxyada wareegyada badan oo hal gabal ah. Labada sare ee xawaaraha sare iyo alxanka hirarka ayaa si weyn u wanaajin kara waxtarka.
2.Panel Illustration
1) Cabbirka dulucda
A. Si loo fududeeyo hab-socodka, cidhifka daloolka ee bannaan ama geeddi-socodku waa inuu noqdaa R chamfering, guud ahaan wareegsan Φ dhexroor 5, saxan yar ayaa la hagaajin karaa.
B. PCB oo leh hal boodh oo ka yar 100mm × 70mm waa in la ururiyaa
2) Qaabka aan caadiga ahayn ee PCB-ga
PCB oo leh qaab aan caadi ahayn oo aan loox guddi ku jirin waa in lagu daraa xariijimo qalabaysan. Haddii uu jiro dalool PCB ka weyn ama le'eg yahay 5mm × 5mm, godka waa in marka hore la dhammeeyaa naqshadeynta si looga fogaado qallafsanaanta mantineer iyo saxan inta lagu jiro alxanka. Qaybta la dhammaystiray iyo qaybta PCB-ga asalka ah waa in lagu xidhaa dhawr dhibcood oo hal dhinac ah oo laga saaraa mawjada alxanka ka dib.
Marka xidhiidhka ka dhexeeya xariijinta qalabka iyo PCB uu yahay jeexdin-qaabeeya, masaafada u dhaxaysa cidhifka dibadda ee qalabka iyo v-qaabeeya jeexdin waa ≥2mm; Marka xidhiidhka ka dhexeeya cidhifka geeddi-socodka iyo PCB waa dalool shaambad, qalab ma jiro. ama wareegga waa in lagu habeeyaa 2mm godka shaambada.
3.Guddiga
Jihada guddidu waa in loo qaabeeyaa si la mid ah jihada cidhifka gudbinta, marka laga reebo meesha cabbirku aanu buuxin karin shuruudaha cabbirka sare ee guddiga. Guud ahaan waxaa loo baahan yahay in tirada "v-cut" ama khadadka godka shaambada ayaa ka yar ama la mid ah 3 (marka laga reebo looxyada dheer iyo kuwa dhuuban).
Guddiga gaarka ah ee qaabka gaarka ah, fiiro gaar ah u yeelo xiriirka ka dhexeeya guddi-hoosaadka iyo guddi-hoosaadka, isku day inaad sameyso isku xirka tallaabo kasta oo lagu kala sooco xariiq.
4.Some note for PCB panel
Guud ahaan, wax soo saarka PCB ayaa fulin doona waxa loogu yeero hawlgalka Panelization si loo kordhiyo waxtarka wax soo saarka ee khadka wax soo saarka SMT. Waa maxay faahfaahinta ay tahay in fiiro gaar ah loo yeesho kulanka PCB? Fadlan u calaamadee kuwan hoos ku qoran:
1) Fireemka sare ee guddiga PCB waa in lagu qaabeeyaa wareeg xiran si loo hubiyo in guddiga PCB uusan dhalan-rogmi doonin marka lagu hagaajiyo qalabka.
2) Qaabka guddiga PCB wuxuu u baahan yahay inuu laba jibaaran yahay sida ugu macquulsan, waxaa lagu talinayaa in la isticmaalo 2 × 2, 3 × 3,…… panel, laakiin ma samaynayso guddiga kala duwan ( yin-yang).
3) Baaxadda cabbirka Panel ≤260mm (line SIEMENS) ama ≤300mm (line FUJI). Haddii loo baahdo in si toos ah loo qaybiyo, ballaca x dhererka ≤125mm × 180mm cabbirka guddida.
4) Loox kasta oo yar oo ka mid ah guddiga PCB waa inuu lahaadaa ugu yaraan saddex godad, 3≤ dhexroorka daloolka ≤ 6mm, fiilooyinka ama SMT looma oggola gudaha 1mm ee daloolka qalabka.
5) Masaafada u dhaxaysa looxa yar waa in lagu xakameeyaa inta u dhaxaysa 75mm iyo 145mm.
6) Markaad dejinayso dalool qalabaynta tixraaca, waa caadi inaad ka tagto meel alxanka furan oo 1.5mm ka weyn oo ku wareegsan daloolka qalabka.
7) Waa in aanay jirin aalado waaweyn ama aalado soo baxaya oo u dhow barta isku xirka u dhexeysa barxadda dibadda ee guddiga iyo gudaha, iyo inta u dhexeysa guddiga iyo guddiga. Ka sokow, waa in ay jiraan in ka badan 0.5mm meel bannaan oo u dhexeeya qaybaha iyo cidhifka guddiga PCB si loo hubiyo in hawlgalka caadiga ah ee qalabka goynta.
8) Afar godad oo qalabaysan oo leh dhexroor dalool oo ah 4mm ± 0.01mm ayaa lagu furay afarta geesood ee geesaha dibadda ee guddiga. Xoogga daloolku waa inuu ahaadaa mid dhexdhexaad ah si loo hubiyo in uusan jabin doonin inta lagu jiro habka sare iyo hoose. saxan;Aperture iyo saxnaanta booska waa inay ahaataa mid sare, darbiga daloolku waa siman yahay oo aan lahayn burr.
9) Mabda 'ahaan, QFP oo leh kala fogaansho ka yar 0.65mm waa in lagu dhejiyaa booskeeda gees- gees. Calaamadaha tixraaca ee meelaynta loo isticmaalo sabuuradda PCB ee golaha waa in loo adeegsadaa laba-labo, oo si siman loo habeeyey qaybaha meelaynta.
10) Qaybaha waaweyni waa inay lahaadaan boosaska meelaynta ama godadka meelaynta, sida I/O interface, makarafoon, interface batari, mikroswitch, jaakadda dhegaha, mishiinka, iwm.