1. Cabbirka PCB
【Sharaxaada Dhabarka】 CabirkaPCBwaxaa xaddidaya awoodda qalabka wax soo saarka elektarooniga ah.Sidaa darteed, cabbirka PCB ee ku habboon waa in lagu tixgaliyaa naqshadaynta nidaamka nidaamka alaabta.
(1) Cabbirka PCB ee ugu badan ee qalabka SMT uu ku rakibi karo waxa laga soo qaatay cabbirka caadiga ah ee xaashida PCB, kuwaas oo badankoodu yihiin 20″ × 24″, taas oo ah, 508mm × 610mm (ballaca tareenka)
(2) Cabbirka lagu taliyey waa cabbirka u dhigma ee qalab kasta oo ku jira khadka wax-soo-saarka SMT, kaas oo ku habboon wax-soo-saarka qalab kasta iyo ciribtirka cilladaha qalabka.
(3) PCB-yada yar-yar, waa in loo qaabeeyaa sidii lagu soo rogi lahaa si kor loogu qaado waxtarka wax soo saarka ee dhammaan khadka wax soo saarka.
Shuruudaha naqshadeynta】
(1) Guud ahaan, cabbirka ugu badan ee PCB waa in lagu xaddidaa inta u dhexeysa 460mm × 610mm.
(2) Baaxadda cabbirka lagu taliyey waa (200 ~ 250)mm × (250 ~ 350) mm, saamiga dhinacuna waa inuu noqdaa <2.
(3) PCB ee cabbirkiisu yahay "125mm×125mm", waa in laga sameeyaa cabbir ku habboon.
2. Qaabka PCB
Qalabka wax soo saarka ee SMT waxa ay adeegsadaan biraha hagaha si ay u qaadaan PCB-yada, PCB-yada leh qaababka aan caadiga ahayn lama qaadi karo, gaar ahaan PCB-yada geesaha ku leh.
Shuruudaha naqshadeynta】
(1) Qaabka PCB-gu waa inuu ahaadaa afargees caadi ah oo geeso wareegsan leh.
(2) Si loo hubiyo xasilloonida habka gudbinta, habka soo-rogista waa in la tixgeliyo si loogu beddelo PCB-ga qaabaysan qaab-dhismeedka qaab-dhismeedka caadiga ah, gaar ahaan meelaha geesaha waa in la buuxiyaa si looga fogaado mowjadaha alxanka daanka inta lagu jiro habka gudbinta.Looxa kaadhka dhexdhexaadka ah.
(3) Looxyada SMT ee saafiga ah, nusqaamaha waa la oggol yahay, laakiin cabbirka farqiga waa inuu ka yar yahay saddex-meelood meel dhererka dhinaca.Kuwa ka sarreeya shuruudahan, dhinaca habka naqshadeynta waa in la buuxiyaa.
(4) Naqshadeynta farta dahabiga ah looma baahna oo kaliya in lagu naqshadeeyo chamfering dhinaca gelinta, laakiin sidoo kale in la naqshadeeyo (1 ~ 1.5) × 45 ° labadaba labada dhinac ee guddiga fur-ga ah si loo fududeeyo gelinta.
3. Dhinaca gudbinta
[Sharaxaad ka dib] Baaxadda cidhifka gudbintu waxay ku xidhan tahay shuruudaha xadiidka gudbinta ee qalabka.Mashiinnada daabacaadda, mashiinnada meelaynta iyo foornooyinka wax lagu iibiyo ee dib u soo qulqulaya, geesta wax-gudbinta guud ahaan waxaa looga baahan yahay inay ka badan tahay 3.5mm.
Shuruudaha naqshadeynta】
(1) Si loo yareeyo qallafsanaanta PCB inta lagu jiro alxanka, jihada dhinaca dheer ee PCB aan la soo rogin ayaa guud ahaan loo isticmaalaa jihada gudbinta;soo rogida, jihada dhinaca dheer waa in sidoo kale loo adeegsadaa jihada gudbinta.
(2) Guud ahaan, labada dhinac ee PCB-ga ama jihada gudbinta ee soo-saarka ayaa loo isticmaalaa dhinaca gudbinta.Ballaca ugu yar ee dhinaca gudbinta waa 5.0mm.Waa in aanay jirin qaybo ama kala-goysyada alxanka ee xagga hore iyo dambe ee dhinaca gudbinta.
(3) Dhanka gudbin la'aanta, ma jirto wax xaddidaad ah oo ku saabsan qalabka SMT, waxaana ugu wanaagsan in la xafido aagga mamnuucida qaybaha 2.5mm.
4. Dalool meel dhigid
[Sharaxaad ka dib] Nidaamyo badan sida habaynta, isu-ururinta, iyo tijaabinta waxay u baahan yihiin meelaynta saxda ah ee PCB-ga.Sidaa darteed, godadka meelaynta ayaa guud ahaan loo baahan yahay in la naqshadeeyo.
Shuruudaha naqshadeynta】
(1) PCB kasta, ugu yaraan laba godad meelaynta waa in loo qaabeeyaa, mid waxaa loo qaabeeyey sidii goobaabin, kan kalena waxa loo qaabeeyey sidii jeexdin dheer.Midka hore waxa loo adeegsadaa meelaynta, kan dambena waxa loo adeegsadaa hagitaan.
Ma jirto shuruud gaar ah oo loogu talagalay daloollada meelaynta, waxaa loo qaabayn karaa iyadoo loo eegayo qeexida warshadaada, iyo dhexroorka lagu taliyay waa 2.4mm iyo 3.0mm.
Meelaynta godadka waa inay ahaadaan godad aan bir lahayn.Haddii PCB-gu yahay PCB la feeray, godka meelaynta waa in lagu qaabeeyaa saxan dalool si kor loogu qaado adkaanta.
Dhererka daloolka hagaha guud ahaan waa laba jeer dhexroorka.
Bartamaha godka meelaynta waa inuu ka fogaadaa 5.0mm dhinaca gudbinta, labada godood ee meelaynta waa inay ahaataa fogaan intii suurtagal ah.Waxaa lagu talinayaa in lagu habeeyo geesaha ka soo horjeeda ee PCB-ga.
(2) PCB-yada isku dhafan (PCBA-yada leh fur-innada lagu rakibay, booska godadka meelaynta waa inay la mid noqdaan hore iyo dambe, si naqshadda qalabka loo wadaago inta u dhaxaysa hore iyo dhabarka, sida furka. garabka hoose waxa kale oo loo isticmaali karaa saxaaradda fur-in.
5. Meelaynta calaamadaha
Mashiinnada meelaynta casriga ah, mashiinada daabacaadda, qalabka baadhista indhaha (AOI), alxanka koollada baadhista (SPI), iwm. Dhammaantood waxay isticmaalaan hababka meelaynta indhaha.Sidaa darteed, calaamadaha meelaynta indhaha waa in lagu qaabeeyaa PCB-ga.
Shuruudaha naqshadeynta】
(1) Calaamadaha meelaynta waxa loo qaybiyaa calaamado meelayn caalami ah (Global Fiducial) iyo calamadaha meelaynta maxaliga ah (Local Fiducial)
Fiducial).Midka hore waxaa loo isticmaalaa meelaynta looxa oo dhan, kan dambena waxaa loo isticmaalaa meelaynta loox-hoosaadyada ama qaybaha ganaaxa.
(2) Calaamadaha meelaynta indhaha waxa loo qaabayn karaa labajibbaaran, dheeman, goobo, iskutallaabyo, ceelal, iwm, oo leh dhererkiisu yahay 2.0mm.Guud ahaan, waxaa lagu talinayaa in la naqshadeeyo qaab qeexid naxaas ah oo wareeg ah oo ah Ø1.0m.Iyadoo la tixgelinayo farqiga u dhexeeya midabka maadada iyo deegaanka, meel aan iib ahayn oo 1mm ka weyn calaamadda meelaynta indhaha ayaa la hayaa, loomana oggola wax jilayaal ah.Saddex ku yaal sabuur isku mid ah Joogitaanka ama maqnaanshaha xaashida naxaasta ah ee lakabka gudaha waa inay la mid noqdaan calaamadda hoosteeda.
(3) Dusha PCB oo leh qaybaha SMD, waxaa lagu talinayaa in lagu diyaariyo saddex calaamado meelaynta indhaha ee geesta guddiga si loogu dhejiyo stereo ee PCB (saddex dhibcood ayaa go'aaminaya diyaarad, dhumucda koollada alxanka ayaa la ogaan karaa) .
(4) Soo-saarista, marka lagu daro in saddexda calaamadood ee meelaynta indhaha lagu hayo guddiga oo dhan, waxa fiican in la naqshadeeyo laba ama saddex calaamadood oo meelaynta indhaha ah ee geesaha ka soo horjeeda ee looxa cutub kasta.
(5) Aaladaha ay ka midka yihiin QFP oo leh masaafada dhexe ee rasaasta ≤0.5mm iyo BGA oo leh masaafo dhexe ≤0.8mm, calaamadaha meelaynta indhaha ee maxaliga ah waa in lagu dhejiyaa geesaha si sax ah loo dhigo.
(6) Haddii ay jiraan qaybo ku rakiban labada dhinac, dhinac kastaa waa inuu lahaadaa calaamadaha meelaynta indhaha.
(7) Haddii uusan jirin dalool meelaynta PCB-ga, bartamaha calaamadda meelaynta indhaha waa in ay ka fogaato 6.5mm dhanka gudbinta ee PCB-ga.Haddii uu jiro dalool meelaynta PCB-ga, xarunta calaamada meelaynta indhaha waa in lagu qaabeeyaa dhinaca godka meelaynta ee u dhow xarunta PCB-ga.
Waqtiga boostada: Abriil-08-2023