Yini okufanele siyenze ngaphambi kwama-SMT ama-PCB phakathi nenqubo yokuhlanganisa i-PCB?
I-PCBFuture inefekthri yokuhlanganisa i-smt, engahlinzeka ngezinsizakalo zomhlangano we-SMT zephakeji elincane kakhulu lezingxenye ze-0201.Kuwukusekela izindlela ezahlukahlukene zokucubungula ezifanaumhlangano we-PCB we-turnkeykanye nezinsizakalo ze-OEM ze-pcba.Manje, ngizokwethula Ikuphi ukuhlolwa okudingeka ukwenze ngaphambi kokucubungula kwe-SMT PCB?
1.Ukuhlolwa kwezingxenye ze-SMT
Izinto zokuhlola zifaka: ukuthengiswa, ukukhokhwa kwephini kanye nokusebenziseka, okufanele kuthathwe isampula umnyango wokuhlola.Ukuhlola ukudayiswa kwezingxenye, singasebenzisa ama-tweezers ensimbi engagqwali ukuze sibambe ingxenye futhi sicwilise ebhodweni likathayela elingu-235±5℃ noma ku-230±5℃, futhi silikhiphe ku-2±0.2s noma 3±0.5s.Kufanele sihlole isimo sokuphela kwe-welding ngaphansi kwe-microscope engu-20x.Kudingeka ukuthi ngaphezu kwe-90% yokuphela kwe-welding yezingxenye kufakwe ithini.
Iworkshop yethu yenqubo ye-SMT izokwenza ngezansi ukuhlolwa kokubukeka:
1.1 Singabheka iziphetho zokushisela noma izindawo zokukhonkwane zezingxenye ze-oxidation noma ukungcola ngokubukeka noma ngengilazi yokukhulisa.
1.2 Inani legama, ukucaciswa, imodeli, ukunemba, nobukhulu bangaphandle bezingxenye kufanele kuhambisane nezimfuneko ze-PCB.
1.3 Izikhonkwane ze-SOT ne-SOIC azikwazi ukukhubazeka.Kumadivayisi e-QFP ahola kaningi anepitch eholayo engaphansi kuka-0.65mm, ukuhlangana kwamaphinikhodi kufanele kube ngaphansi kuka-0.1mm futhi singahlola ngokuhlola kokubona kwesikhwezi.
1.4 Ku-PCBA edinga ukuhlanzelwa ukucutshungulwa kweziqephu ze-SMT, uphawu lwezingxenye akumele liwe ngemva kokuhlanza, futhi alukwazi ukuthikameza ukusebenza nokuthembeka kwezingxenye.Ukuthi singakwazi ukuhlola okubukwayo ngemva kokuhlanza.
2Ukuhlolwa kwe-PCB
2.1 Iphethini yomhlaba ye-PCB nosayizi, imaski ye-solder, isikrini sikasilika, kanye nezilungiselelo zembobo kufanele zihlangabezane nezidingo zokuklama zamabhodi esekethe aphrintiwe e-SMT.Singabheka ukuthi isikhala sephedi sinengqondo, isikrini siphrintwe kuphedi, futhi i-via yenziwe kuphedi, njll.
2.2 Ubukhulu be-PCB kufanele bulingane, futhi ubukhulu, izimbobo zokubeka, namareferensi amamaki e-PCB kufanele ahlangabezane nezimfuneko zemishini yolayini wokukhiqiza.
2.3 PCB usayizi wokugoba ovumelekile:
2.3.1 Phezulu/i-convex: umkhawulo ongu-0.2mm/50mm ubude nobukhulu obungu-0.5mm/ubude bayo yonke i-PCB.
2.3.2 Phansi/i-concave: ubukhulu obungu-0.2mm/50mm ubude nobukhulu obungu-1.5mm/ubude bayo yonke i-PCB.
2.3.3 Kufanele sihlole ukuthi i-PCB ingcolile noma imanzi.
3Izinyathelo zokuphepha zenqubo ye-SMT PCB:
3.1 Uchwepheshe ufaka iringi ye-electrostatic ehloliwe.Ngaphambi kwe-plug-in, kufanele sihlole izingxenye ze-elekthronikhi ze-oda ngalinye azinawo amaphutha/ukuxubana, umonakalo, ukuwohloka, imihuzuko, njll.
3.2 I-plug-in board ye-PCB idinga ukulungisa izinto zikagesi kusenesikhathi, futhi yazi ukuthi isiqondiso se-capacitor polarity kufanele silungile.
3.3 Ngemva kokuthi umsebenzi wokuphrinta we-SMT usuqediwe, hlola imikhiqizo enesici njengokungashutheki okushodayo, ukufakwa okukuhlehlayo, nokungaqondani kahle, njll., bese ufaka ithini eliqediwe i-PCB enqubweni elandelayo.
3.4 Sicela ufake indandatho kagesi ngaphambi kwe-SMT PCB phakathi nenqubo yokuhlanganisa i-PCB.Ishidi lensimbi kufanele libe eduze kwesikhumba sesihlakala futhi libe phansi kahle.Sebenza ngokushintshana ngezandla zombili.
3.5 Izingxenye zensimbi ezifana ne-USB, isokhethi ye-IF, ikhava eyisivikelo, ishuna kanye netheminali yembobo yenethiwekhi kufanele igqoke ombhede weminwe lapho uxhuma.
3.6 Indawo kanye nendlela izinto ezisetshenziswa ngayo kufanele kube okulungile.Izingxenye kufanele zibe flat ngokumelene nendawo yebhodi, futhi izingxenye eziphakeme kufanele zifakwe onyaweni luka-K.
3.7 Uma okokusebenza kungqubuzana nokucaciswa kwe-SOP ne-BOM, kufanele kwaziswe umqaphi noma umholi weqembu kusenesikhathi.
3.8 Impahla kufanele isingathwe ngokucophelela.Ungaqhubeki nokusebenzisa i-PCB enezingxenye ezilimele, futhi i-crystal oscillator ayikwazi ukusetshenziswa ngemva kokulahlwa.
3.9 Sicela ulungise futhi ugcine indawo yokusebenza ihlanzekile ngaphambi kokusebenza futhi uphume emsebenzini.
3.10 Ukuthobela ngokuqinile imithetho yokusebenza yendawo yokusebenza.I-PCB endaweni yokuqala yokuhlola, indawo okufanele ihlolwe, indawo enesici, indawo yokulungisa, kanye nendawo yempahla ephansi engavunyelwe endaweni engahleliwe.
4Kungani ukhetha i-PCBFuture yezinsizakalo zakho zomhlangano we-pcb?
4.1Isiqinisekiso samandla
4.1.1 Iworkshop: Inemishini ephuma kwamanye amazwe, engakhiqiza amaphuzu ayizigidi ezi-4 ngosuku.Inqubo ngayinye ifakwe i-QC engakwazi ukugcina ikhwalithi ye-PCB.
4.1.2 Ulayini wokukhiqiza we-DIP: Kunemishini emibili ye-wave soldering, futhi sinabasebenzi abanolwazi abangaphezu kweshumi abanolwazi olungaphezu kweminyaka emithathu.Abasebenzi banekhono eliphezulu futhi bangakwazi ukushisela izinto ezihlukahlukene ze-plug-in.
4.2Ukuqinisekiswa kwekhwalithi, izindleko eziphezulu ezisebenzayo
4.2.1 Izisetshenziswa ezisezingeni eliphezulu zinganamathisela izingxenye ezimise okunembayo, i-BGA, i-QFN, izinto ezingu-0201.Ingase futhi isetshenziselwe isampula patch kanye nokubeka izinto ngobuningi ngesandla.
4.2.2 Kokubiliisevisi yomhlangano we-prototype pcb, ivolumu pcb umhlanganoamasevisi angahlinzekwa.
4.3Okuhlangenwe nakho okucebile ku-SMT PCB kanye ne-soldering ye-PCB, futhi yisikhathi sokulethwa esizinzile.
4.3.1 Izinsizakalo ezinqwabelene ezinkulungwaneni zezinkampani zama-elekthronikhi, ezibandakanya isevisi yokuhlanganisa i-SMT yezinhlobo ezahlukene zemishini yezimoto kanye namabhodi omama okulawula izimboni.Umhlangano we-PCB ne-PCB uthunyelwa eYurophu nase-United States, futhi ikhwalithi iqinisekiswa ngamakhasimende.
4.3.2 Ukulethwa ngesikhathi.Izinsuku ezijwayelekile ezingama-3-5 uma izinto zokwakha ziphelele futhi zixazulula i-EQ, namaqoqo amancane nawo angathunyelwa ngosuku.
4.4Amandla okulungisa aqinile kanye nensizakalo yangemva kokuthengisa
4.4.1 Unjiniyela olungisa izinto unesipiliyoni esicebile futhi angakwazi ukulungisa ama-PCB angasebenzi kahle okubangwa ukushisela okuhlukahlukene.Singaqinisekisa izinga lokuxhuma le-PCB ngayinye.
4.4.2 Isevisi yamakhasimende izophendula ngamahora angama-24 futhi ixazulule izinkinga ze-oda lakho ngokushesha okukhulu.
Isikhathi sokuthumela: Feb-28-2021