Njengoko ubukhulu bamacandelo e-PCBA buba buncinci kwaye buncinci, ukuxinana kuya phezulu kwaye phezulu;Ukuphakama phakathi kwezixhobo kunye nezixhobo (i-pitch / imvume yomhlaba phakathi kwe-PCB kunye ne-PCB) nayo iya incinci kwaye incinci, kwaye impembelelo yezinto ezisingqongileyo kwi-PCBA nayo iyanda, ngoko sibeka phambili iimfuno eziphezulu zokuthembeka. yeemveliso ze-elektroniki PCBA.
PCBA components ukusuka enkulu ukuya encinane, ukusuka sparse ukuya ezixineneyo utshintsho trend
Imiba yokusingqongileyo kunye nemiphumo yazo
Izinto eziqhelekileyo zokusingqongileyo ezifana nokufuma, uthuli, isitshizi setyuwa, ukungunda, njl., kubangela iingxaki ezahlukeneyo zokungaphumeleli kwe-PCBA
Ukufuma kwimekobume yangaphandle yamacandelo e-PCB ye-elektroniki, phantse yonke into kukho umngcipheko wokuhlwa, apho amanzi yeyona ndlela ibalulekileyo yokubola, iimolekyuli zamanzi zincinci ngokwaneleyo ukuba zingene kumsantsa wemolekyuli wezinye izinto zepolymer ngaphakathi okanye nge imingxuma yokugquma ukuze ifikelele kwi-corrosion yentsimbi engaphantsi.Xa iatmosfera ifikelela kubumanzi obuthile, inokubangela iPCB electrochemical imfuduko, ukuvuza kwangoku kunye nokugqwetheka komqondiso kwiisekethe ezikwi-high-frequency.
PCBA indibano |SMT patch processing |ibhodi yesekethe welding processing |OEM electronic assembly |ibhodi yesekethe patch processing – Gaotuo Electronic Technology
Umphunga/ukufuma + izingcolisi ze-ionic (ityuwa, i-flux esebenzayo) = i-electrolyte eqhubayo + i-voltage yoxinzelelo = imfuduko ye-electrochemical
Xa i-RH emoyeni ifikelela kwi-80%, kuya kubakho i-5 ukuya kwe-20 yeemolekyuli zefilimu yamanzi ashinyeneyo, zonke iintlobo zeemolekyuli zinokuhamba ngokukhululekileyo, xa kukho i-carbon, inokuvelisa i-electrochemical reaction;Xa i-RH ifikelela kwi-60%, i-surface layer yezixhobo iya kwenza ifilimu yamanzi kunye nobukhulu be-2 ukuya kwi-4 iamolekyu zamanzi, kwaye ukuphendulwa kweekhemikhali kuya kwenzeka xa ukungcola kuchithwa kuyo.Xa i-RH <20% kwi-atmosfera, phantse yonke i-corrosion phenomena iyayeka;
Ngoko ke, ukukhuselwa komswakama yinxalenye ebalulekileyo yokukhusela imveliso.
Kwizixhobo zombane, ukufuma kuza ngeendlela ezintathu: imvula, ukujiya, kunye nomphunga wamanzi.Amanzi yi-electrolyte enokunyibilikisa izixa ezikhulu zeeyoni ezidlayo ezidla iintsimbi.Xa ubushushu bendawo ethile yesixhobo bungaphantsi "kwendawo yombethe" (ubushushu), kuya kubakho ukuxinana kumphezulu: iinxalenye zesakhiwo okanye i-PCBA.
uthuli
Kukho uthuli kwi-atmosfera, kwaye uthuli lubhengeza izinto ezingcolisa i-ion ukuze zihlale ngaphakathi kwezixhobo ze-elektroniki kwaye zibangele ukusilela.Olu luphawu oluqhelekileyo lokungaphumeleli kwe-elektroniki kwintsimi.
Uthuli luhlulwe lube ziindidi ezimbini: uthuli olurhabaxa lunamasuntswana angaqhelekanga kunye nobubanzi be-2.5 ukuya kwi-15 microns, ngokuqhelekileyo engabangeli iingxaki ezifana nokungaphumeleli, i-arc, kodwa ichaphazela uqhagamshelwano lomnxibelelanisi;Uthuli olucokisekileyo ngamasuntswana angaqhelekanga kunye nobubanzi obungaphantsi kwe-2.5 microns.Uthuli olucolekileyo lunokunamathela okuthile kwi-PCBA (i-veneer) kwaye inokususwa ngamabhrashi achasene ne-static.
Iingozi zothuli: a.Ngenxa yokuhlalisa uthuli kumphezulu we-PCBA, i-electrochemical corrosion yenziwa, kwaye izinga lokungaphumeleli liyenyuka;b.Uthuli + ubushushu obumanzi + isitshizi setyuwa sinomonakalo omkhulu kwi-PCBA, kunye nokusilela kwezixhobo zombane zezona ziselunxwemeni, intlango (umhlaba wetyuwa-alkali), kunye noshishino lweekhemikhali kunye neendawo zemigodi kufutshane noMlambo iHuaihe ngexesha lokungunda kunye nemvula. .
Ngoko ke, ukukhuselwa kothuli yinxalenye ebalulekileyo yokukhuselwa kweemveliso.
Isitshizi setyuwa
Ukuqulunqwa kwetyuwa yokutshiza: ukutshiza ityuwa kubangelwa yimiba yendalo efana namaza, amaza kunye nokujikeleza kwe-atmospheric (monsoon) uxinzelelo, ukukhanya kwelanga, kwaye kuya kuwela ngaphakathi kunye nomoya, kwaye ukugxila kwayo kuncipha kunye nomgama ukusuka elunxwemeni, ngokuqhelekileyo i-1Km ukusuka elunxwemeni. unxweme luyi-1% yonxweme (kodwa i-typhoon iya kuphephetha ngakumbi).
Ubungozi besitshizi setyuwa: a.yonakalisa i-coat of metal structural parts;b.Ukunyuka kwesantya se-electrochemical corrosion kukhokelela ekuqhekekeni kocingo lwentsimbi kunye nokusilela kwecandelo.
Imithombo yokonakala efanayo: a.Kukho ityuwa, i-urea, i-lactic acid kunye nezinye iikhemikhali kwi-sweat sweat, enefuthe elifanayo le-corrosion kwisixhobo sombane njenge-spray yetyuwa, ngoko ke iiglavu kufuneka zigqitywe ngexesha lokudibanisa okanye ukusetyenziswa, kwaye ukugubungela akufanele kuchukunyiswe ngezandla ezingenanto;b.Kukho i-halogens kunye ne-acids kwi-flux, ekufuneka icocwe kwaye i-concentration yayo eseleyo ilawulwe.
Ngoko ke, ukuthintela ukutshizwa kwetyuwa kuyinxalenye ebalulekileyo yokukhusela imveliso.
ngundo
Ukungunda, igama elixhaphakileyo lokungunda, lithetha “umngundo ovundayo,” othanda ukwenza i-mycelium etyebileyo, kodwa angavelisi iziqhamo ezinkulu njengamakhowa.Kwiindawo ezifumileyo nezifudumeleyo, izinto ezininzi zikhula i-fluff ebonakalayo, i-flocculent okanye i-spider colonies, oko kungundo.
PCB ukungunda isenzeko
Ukwenzakala kokungunda: a.i-mold phagocytosis kunye nokusabalalisa kwenza ukugquma kwezinto eziphilayo kuyancipha, umonakalo kunye nokungaphumeleli;b.I-metabolites ye-mold i-acids ye-organic, echaphazela i-insulation kunye nokumelana nombane kunye nokuvelisa i-arc.
PCBA indibano |SMT patch processing |ibhodi yesekethe welding processing |OEM electronic assembly |ibhodi yesekethe patch processing – Gaotuo Electronic Technology
Ngoko ke, i-anti-mold iyinxalenye ebalulekileyo yokukhusela iimveliso.
Ukuqwalasela le miba ingentla, ukuthembeka kwemveliso kufuneka kuqinisekiswe ngcono, kwaye kufuneka kube yodwa kwindawo yangaphandle ephantsi kangangoko kunokwenzeka, ngoko inkqubo yokumbathisa imilo iyaziswa.
Emva kwenkqubo yokugquma kwePCB, umphumo wokudubula phantsi kwesibane esimfusa, isambatho sokuqala sinokuba sihle kakhulu!
Ukwaleka okuthathu okuchasene nepeyinti kubhekiselele kumphezulu we-PCB oqatywe ngomaleko obhityileyo wokhuselo lokhuselo, ngoku yeyona ndlela ixhaphakileyo isetyenziswa ngasemva kwewelding, maxa wambi eyaziwa ngokuba ngumphezulu wepeyinti, ukugquma kwemilo (igama lesiNgesi lokwaleka, ukutyabeka ngokusemthethweni. ).Ikwahlulahlula izinto ze-elektroniki ezibuthathaka kwiindawo ezirhabaxa, iphucula kakhulu ukhuseleko kunye nokuthembeka kweemveliso ze-elektroniki kunye nokwandisa ubomi benkonzo yeemveliso.I-Trint-resistant coatings ikhusela iisekethe / izinto ezivela kwizinto zokusingqongileyo ezifana nokufuma, ukungcola, ukubola, uxinzelelo, ukothuka, ukungcangcazela koomatshini kunye nokuhamba ngebhayisikile eshushu, ngelixa ikwaphucula amandla omatshini kunye neempawu zokugquma kwemveliso.
Emva kwenkqubo yokugquma, i-PCB yenza ifilimu ekhuselayo ecacileyo phezu komhlaba, enokuthintela ngokufanelekileyo ukungena kwamanzi kunye nomswakama, ugweme ukuvuza kunye nesiphaluka esifutshane.
2. Amanqaku aphambili enkqubo yokwaleka
Ngokweemfuno ze-IPC-A-610E(uMgangatho woVavanyo lweNdibano ye-Electronic), ibonakaliswa ikakhulu kule miba ilandelayo.
ibhodi PCB Complex
1. Iindawo ezingenakugqunywa:
Iindawo ezifuna uqhagamshelo lombane, njengeepadi zegolide, iminwe yegolide, intsimbi ephuma emingxunyeni, imingxuma yokuvavanya;Iibhetri kunye nokunyuka kwebhetri;Isidibanisi;Fuse kunye nezindlu;Isixhobo sokutshatyalaliswa kobushushu;Ucingo lokutsiba;Iilensi zezixhobo zamehlo;Isixhobo sokulinganisa amandla;UluvoAkukho switshi itywiniweyo;Ezinye iindawo apho ukutyabeka kunokuchaphazela ukusebenza okanye ukusebenza.
2. Iindawo ezimele zigqunywe: zonke ii-solder joints, izikhonkwane, iiconductors zecandelo.
3. Iindawo ezinokupeyintwa okanye hayi
ubukhulu
Ukutyeba kulinganiswa kwindawo ethe tyaba, engathintelekiyo, enyangekileyo yecandelo lesekethe eprintiweyo, okanye kwipleyiti yokuncamathela ehamba inkqubo yokuvelisa kunye necandelo.Ibhodi eqhotyoshelweyo ingaba yinto efanayo nebhodi eprintiweyo okanye ezinye izinto ezingenayo i-porous, njengentsimbi okanye iglasi.Umlinganiselo wobungqingqwa befilimu emanzi isenokusetyenziswa njengendlela ekhethwayo yokulinganisa ubungqingqwa bokwambathisa, ngaphandle kokuba unxulumano loguqulo phakathi kobunzima befilimu eyomileyo nemanzi bubhaliwe.
Itheyibhile 1: Umgangatho woluhlu lokutyeba kuhlobo ngalunye lwezinto zokwaleka
Indlela yokuvavanya ukutyeba:
1. Isixhobo sokulinganisa ubukhulu befilimu eyomileyo: i-micrometer (IPC-CC-830B);b Igeyiji yokuThimba kweFilimu eyomileyo (isiseko sentsimbi)
Micrometer isixhobo sefilimu esomileyo
2. Umlinganiselo wobukhulu befilimu emanzi: Ubukhulu befilimu emanzi bunokufumaneka ngegeyiji yobukhulu befilimu emanzi, emva koko ibalwe ngokomlinganiselo weglu eqinileyo.
Ukutyeba kwefilimu eyomileyo
Ubunzima befilimu emanzi bufunyenwe yi-gauge yefilimu emanzi, kwaye ke ifilimu eyomileyo ibalwa
Isisombululo somda
Inkcazo: Phantsi kweemeko eziqhelekileyo, isitshizi sevalve yokutshiza ngaphandle komgca womgca asiyi kuba ngqo ngqo, kuya kuhlala kukho i-burr ethile.Sichaza ububanzi be-burr njengesisombululo somphetho.Njengoko kubonisiwe ngezantsi, ubungakanani be-d lixabiso lesisombululo somphetho.
Qaphela: Isisombululo somphetho ngokuqinisekileyo sincinci ngakumbi, kodwa iimfuno zabathengi ezahlukeneyo azifani, ngoko ke isisombululo somphetho esigqunyiweyo ukuba sihlangabezana neemfuno zabathengi.
Uthelekiso lwesisombululo soMda
Ukufana, iglu kufuneka ifane nobukhulu obufanayo kunye nefilimu ecacileyo egudileyo egutyungelwe kwimveliso, ugxininiso lufana nokufana kweglue egqunywe kwimveliso engaphezulu kwendawo, ngoko kufuneka ibe nobunzima obufanayo, akukho ngxaki yenkqubo: iintanda, i-stratification, imigca e-orenji, ungcoliseko, i-capillary phenomenon, amaqamza.
Axis oluzenzekelayo AC series oluzenzekelayo ukutyabeka umatshini isiphumo ukutyabeka, ukufana iyahambelana kakhulu
3. Indlela yokuqonda inkqubo yokwaleka kunye nenkqubo yokugubungela
Inyathelo 1 Lungisa
Lungisa iimveliso kunye neglu kunye nezinye izinto eziyimfuneko;Ukumisela indawo yokhuseleko lwendawo;Qinisekisa iinkcukacha eziphambili zenkqubo
Inyathelo lesi-2 Hlamba
Kufuneka icocwe ngexesha elifutshane emva kwe-welding ukukhusela ukungcola kwe-welding ukuba kube nzima ukuyicoca;Qinisekisa ukuba ungcoliseko oluphambili luyi-polar okanye alukho-polar ukwenzela ukuba ukhethe i-arhente yokucoca efanelekileyo;Ukuba i-agent yokucoca utywala isetyenzisiweyo, imiba yokhuseleko kufuneka ihlawulwe ingqalelo: kufuneka kubekho umoya omhle kunye nokupholisa kunye nemithetho yenkqubo yokomisa emva kokuhlamba, ukuthintela ukuchithwa kwe-solvent eseleyo okubangelwa ukuqhuma kwi-oven;Ukucoca amanzi, hlamba i-flux nge-alkaline yokucoca i-alkali (emulsion), uze uhlambe umbane wokucoca ngamanzi acocekileyo ukuhlangabezana nomgangatho wokucoca;
3. Ukukhuselwa kweMasking (ukuba izixhobo zokugquma ezikhethiweyo azisetyenziswanga), oko kukuthi, imaski;
Kufuneka ukhethe ifilimu engabambeleliyo ayiyi kudlulisa iteyiphu yephepha;Iteyiphu yephepha le-Anti-static kufuneka isetyenziswe kukhuseleko lwe-IC;Ngokweemfuno zemizobo, ezinye izixhobo zikhuselekile;
4.Dehumidify
Emva kokucoca, i-PCBA ekhuselekileyo (icandelo) kufuneka yomiswe kwangaphambili kwaye ihlanjululwe ngaphambi kokugubungela;Qinisekisa ubushushu / ixesha lokumisa kwangaphambili ngokweqondo lokushisa elivunyelwe yi-PCBA (icandelo);
Itheyibhile 2: I-PCBA (amacandelo) inokuvunyelwa ukuba inqume ubushushu / ixesha letafile yokumisa kwangaphambili
Inyathelo lesi-5 Faka isicelo
Indlela yenkqubo yokugquma ixhomekeke kwiimfuno zokhuseleko lwe-PCBA, izixhobo zokusebenza ezikhoyo kunye noovimba bobugcisa obukhoyo, abadla ngokufezekiswa ngezi ndlela zilandelayo:
a.Brasha ngesandla
Indlela yokupeyinta ngesandla
Ukugquma kwebrashi yeyona nkqubo isebenzayo, ilungele imveliso yebhetshi encinci, ubume bePCBA buntsonkothile kwaye buxinene, kufuneka bukhusele iimfuno zokhuseleko lweemveliso ezirhabaxa.Ngenxa yokuba ukuxubha kunokulawula ukugquma ngokuthanda, iindawo ezingavumelekanga ukuba zipeyintwe aziyi kungcoliswa;Ukusetyenziswa kwe-brush yezinto ezincinci, ezifanelekileyo kwixabiso eliphezulu leengubo zamacandelo amabini;Inkqubo yokuxukuxa ineemfuno eziphezulu kumqhubi, kwaye imizobo kunye neemfuno zokwaleka kufuneka zigaywe ngononophelo phambi kolwakhiwo, kwaye amagama amacandelo e-PCBA anokuchongwa, kwaye amanqaku abambe amehlo kufuneka ancanyathiselwe kwiindawo ezingavumelekanga ziqatywe.Umsebenzisi akavumelekanga ukuba achukumise iplagi eprintiweyo ngesandla nangaliphi na ixesha ukunqanda ungcoliseko;
PCBA indibano |SMT patch processing |ibhodi yesekethe welding processing |OEM electronic assembly |ibhodi yesekethe patch processing – Gaotuo Electronic Technology
b.Dipha ngesandla
Indlela yokwaleka idiphu ngesandla
Inkqubo yokugquma idiphu ibonelela ngezona ziphumo zokwaleka ezigqwesileyo, ezivumela iyunifomu, ukugquma okuqhubekayo ukuba kusetyenziswe kuyo nayiphi na inxalenye yePCBA.Inkqubo yokwambathisa idiphu ayifanelekanga kumacandelo ePCBA anecapacitor ehlengahlengiswayo, i-trimmer cores, ii-potentiometers, iicores ezimilise ikomityi kunye nezinye izixhobo ezingavalwanga kakuhle.
Iiparamitha eziphambili zenkqubo yokwambathisa idiphu:
Lungisa i-viscosity efanelekileyo;Lawula isantya apho i-PCBA iphakanyiswe khona ukuthintela amaqamza ukuba enze.Ngokuqhelekileyo akukho ngaphezu kwemitha ye-1 ngesekondi yokwanda kwesantya;
c.Ukutshiza
Ukutshiza yeyona nkqubo isetyenziswa kakhulu kwaye yamkeleke lula, eyahlulahlulwe yazi ndidi zimbini zilandelayo:
① Ukutshiza ngesandla
Inkqubo yokutshiza ngesandla
Kufanelekile kwimeko yokuba i-workpiece inzima kakhulu kwaye inzima ukuthembela kwizixhobo ezizenzekelayo kwimveliso yobuninzi, kwaye ifanelekile kwimeko yokuba umgca wemveliso uneentlobo ezininzi kodwa isixa sincinci, kwaye sinokutshizwa. isikhundla esikhethekileyo.
Ukutshiza ngesandla kufuneka kuqatshelwe: inkungu yepeyinti iya kungcolisa ezinye izixhobo, ezinjenge-PCB plug-ins, iisokethi ze-IC, ezinye zonxibelelwano ezibuthathaka kunye nezinye iindawo ezisezantsi, ezi ndawo kufuneka zithathele ingqalelo ukuthembeka kokhuseleko lokhuselo.Enye ingongoma kukuba umqhubi akufanele achukumise iplagi eprintiweyo ngesandla nangaliphi na ixesha ukuthintela ukungcoliseka kwendawo yoqhagamshelwano lweplagi.
② Ukutshiza ngokuzenzekelayo
Ngokuqhelekileyo ibhekisela ekutshizeni okuzenzekelayo kunye nezixhobo zokugquma ezikhethiweyo.Ifanele imveliso yobuninzi, ukuhambelana kakuhle, ukuchaneka okuphezulu, ukungcoliseka okuncinci kokusingqongileyo.Ngokuphuculwa kweshishini, ukuphuculwa kweendleko zabasebenzi kunye neemfuno ezingqongqo zokukhuselwa kwendalo, izixhobo zokutshiza ngokuzenzekelayo zithatha indawo yezinye iindlela zokugquma.