1. SMT solder peista e ama boleng ba solder joang?
Karolelano ea boima ba flux le sebopeho sa likarolo tsa solder paste flux:
(1) Lintho tse etsang filimi: 2% ~ 5%, haholo-holo rosin, le lihlahisoa, lisebelisoa tsa maiketsetso, tse sebelisoang haholo ke rosin e tšoeu ea metsi.
(2) Activator: 0.05% ~ 0.5%, li-activator tse sebelisoang ka ho fetisisa li kenyelletsa dicarboxylic acid, li-carboxylic acid tse khethehileng, le letsoai la organic halide.
(3) Moemeli oa Thixotropic: 0,2% ~ 2%, e eketsa viscosity mme e sebetsa e le ho emisoa.Ho na le lintho tse ngata tse joalo, haholo-holo oli ea castor, oli ea hydrogenated castor, ethylene glycol mono butylene, le carboxymethyl cellulose.
(4) Solvent: 3% ~ 7%, likarolo tse ngata, tse nang le lintlha tse fapaneng tse belang.
(5) Tse ling: li-surfactants, li-coupling agents.
Tšusumetso ea sebopeho sa solder paste flux ho boleng ba soldering:
tin bead splash, flux splash, ball book array (BGA) void, bridging, le tse ling tse mpe tsa SMT chip processing le welding li na le kamano e ntle le sebopeho sa solder paste.Khetho ea peista ea solder e lokela ho khethoa ho latela litšobotsi tsa ts'ebetso ea kopano ea boto ea potoloho e hatisitsoeng (PCBA).Karolo ea phofo ea solder e na le tšusumetso e kholo ho ntlafatseng ts'ebetso le viscosity.Ha phofshoana ea solder e phahame, ho fokotseha ho honyenyane.Ka hona, peista ea solder e sebelisetsoang likarolo tse ntle tsa molumo e lokela ho sebelisa 88% ~ 92% ho feta solder powder content ea solder peista.
1. The activator etsa qeto ea ho solderability kapa wettability ea solder peista.Ho fihlela solder e ntle, ho tlameha ho ba le activator e loketseng ho peista ea solder, haholo-holo tabeng ea micro-pad soldering, haeba ts'ebetso e sa lekana, e ka baka ketsahalo ea bolo ea morara le bofokoli ba bolo-socket.
2. Lintho tse etsang lifilimi li ama ho lekanya ha manonyeletso a solder le viscosity le viscosity ea solder paste.
3. Flux e sebelisoa haholo-holo ho qhaqha li-activators, lintho tse etsang filimi, li-thixotropic agents, joalo-joalo. The flux in solder paste hangata e entsoe ka li-solvents tse nang le lintlha tse fapaneng tse belang.Sepheo sa ho sebelisa li-solvents tse phahameng tse belang ke ho thibela solder le flux hore e se ke ea phatloha nakong ea reflow soldering.
4. Moemeli oa Thixotropic o sebelisetsoa ho ntlafatsa tshebetso ea khatiso le ts'ebetso ea ts'ebetso.
2. Ke lintlha life tse amang katleho ea tlhahiso ea SMT?
Potoloho ea ho behoa e bua ka nako eo hlooho ea ho beha lisebelisoa e qala ho bala ha Feeder e nka likarolo, ka mor'a ho lemoha litšoantšo tsa likaroloana, cantilever e fallela sebakeng se lumellanang, axis e sebetsang e beha likarolo ka har'a boto ea PCB. , ebe e khutlela sebakeng sa ho fepa Feeder.Ke potoloho ea ho beha;nako e sebelisoang potolohong ea ho bea hape ke boleng ba mantlha ba paramente bo amang lebelo la mochini oa ho beha.Potoloho ea ho beoa ha mochini oa cantilever o lebelo haholo bakeng sa likarolo tsa matla a ho hanyetsa hangata o ka har'a 1.0s.Hona joale, ho behoa ha SMT Potoloho ea mochine oa cantilever ka lebelo le phahameng ka ho fetisisa indastering ea ts'ebetso ea chip e ka bang 0.5s;Potoloho ea ho kenya li-IC tse kholo, li-BGA, lihokelo, le li-capacitor tsa aluminium electrolytic ke hoo e ka bang 2s.
Lintlha tse amang potoloho ea ho beha:
Sekhahla sa ho hokahanya ha likarolo tsa ho nka (ke hore, lithupa tse ngata tsa khokahano ea hlooho ea ho beoa li phahama le ho oa ka nako e le 'ngoe ho nka likarolo).
Boholo ba boto ea PCB (boto ea PCB e kholoanyane, boholo ba motsamao oa X/Y oa hlooho e behiloeng, le nako e telele ea ho sebetsa).
Sekhahla sa ho lahlela likarolo (haeba likarolo tsa setšoantšo sa karolo li sa behoa hantle, ho lahlela lisebelisoa le liketso tse sa nepahaleng tsa X / Y li tla etsahala nakong ea ts'ebetso ea ho lemoha setšoantšo sa likarolo tsa ho monya).
Sesebelisoa se beha boleng ba paramethara ea lebelo le tsamaeang X/Y/Z/R.
3. Joang ho boloka le ho sebelisa solder peista ka katleho fekthering ea ho lokisa patch ea SMT?
1. Ha solder paste e sa sebelisoe, e lokela ho bolokoa ka sehatsetsing, 'me mocheso oa eona oa polokelo o lokela ho ba ka har'a 3 ~ 7 ° C.Ka kopo hlokomela hore pente ea solder e ke ke ea hoamisoa ka tlase ho 0°C.
2. Ho lokela ho ba le thermometer e inehetseng ka sehatsetsing ho bona mocheso o bolokiloeng lihora tse ling le tse ling tse 12 le ho etsa rekoto.Thermometer e hloka ho hlahlojoa khafetsa ho thibela ho hloleha, 'me litlaleho tse nepahetseng li lokela ho etsoa.
3. Ha u reka pente ea solder, hoa hlokahala ho beha letsatsi la theko ho khetholla lihlopha tse fapaneng.Ho ea ka taelo ea ts'ebetso ea chip ea SMT, hoa hlokahala ho laola potoloho ea tšebeliso ea solder paste, 'me thepa ka kakaretso e laoloa nakong ea matsatsi a 30.
4. Polokelo ea solder peista e lokela ho bolokoa ka thoko ho ea ka mefuta e fapaneng, linomoro tsa batch, le bahlahisi ba fapaneng.Ka mor'a ho reka pente ea solder, e lokela ho bolokoa ka sehatsetsing, 'me molao-motheo oa ho kena pele, oa pele o lokela ho lateloa.
4. Mabaka a ho tjheseletsa batang ka PCBA sebetsa
1. Mocheso oa mocheso o tlaase haholo kapa nako ea ho lula ha mocheso oa soldering oa reflow o khutšoanyane haholo, o baka mocheso o sa lekaneng nakong ea ho phalla le ho qhibiliha ho sa phethoang ha phofo ea tšepe.
2. Mokhahlelong oa ho pholisa, moea o pholileng o matla, kapa ho tsamaea ha lebanta la conveyor le sa lekaneng ho sitisa manonyeletso a solder, 'me ho hlahisa libopeho tse sa lekaneng holim'a li-solder, haholo-holo mocheso o ka tlaase hanyenyane ho feta ntlha ea ho qhibiliha, solder e bonolo haholo.
3. Tšilafalo ea bokaholimo le mathōkong a lipache kapa likhoele li ka sitisa matla a phallo, e leng se bakang phallo e sa fellang.Ka linako tse ling phofo ea solder e sa qhibilihisitsoeng e ka bonoa holim'a motsoako oa solder.Ka nako e ts'oanang, matla a sa lekaneng a ho phalla a tla boela a fane ka ho tlosoa ho sa phethoeng ha li-oxide tsa tšepe le ho latela condensation e sa fellang.
4. Boleng ba phofo ea tšepe ea solder ha e ntle;boholo ba bona ba thehoa ke encapsulation ea haholo oxidized phofo likaroloana.
5. Mokhoa oa ho Hloekisa Kopano ea PCB ka Tsela e Sireletsehileng le e Molemo ka ho Fetisisa
Ho hloekisa likopano tsa PCB ho lokela ho sebelisa mochine o hloekileng ka ho fetisisa le ho hloekisa solvent, e itšetlehileng ka litlhoko tsa boto.Mona, litsela tse fapaneng tsa ho hloekisa PCB le melemo le likotsi tsa tsona li bontšitsoe.
1. Ultrasonic PCB Cleaning
Sesebelisoa sa ultrasonic PCB cleaner se hloekisa li-PCB tse se nang letho kapele ntle le ho hloekisa solvent, 'me ona ke mokhoa o sebetsang ka ho fetisisa oa ho hloekisa PCB.Ntle ho moo, mokhoa ona oa ho hloekisa ha o thibele boholo ba PCB kapa bongata.Leha ho le joalo, ha e khone ho hloekisa kopano ea PCB hobane ultrasonic e ka senya likarolo tsa elektronike le kopano.Hape e ke ke ea hloekisa PCB ea sefofane / ts'ireletso hobane ultrasonic e ka ama ho nepahala ha motlakase oa boto.
2. Full Automatic On-line PCBA Cleaning
The othomathike ka ho feletseng on-line PCBA hloekileng e loketse ho hloekisa meqolo e khōlō ea PCB kopano.PCB le PCBA ka bobeli li ka hloekisoa, 'me e ke ke ea ama ho nepahala ha liboto.Li-PCBA li fetisa likheo tse fapaneng tse nang le solvent ho phethela lits'ebetso tsa ho hloekisa metsi ka lik'hemik'hale, ho hlatsoa metsi, ho omisa, joalo-joalo.Mokhoa ona oa ho hloekisa oa PCBA o hloka hore solvent e lumellane le likarolo, PCB holim'a metsi, mask a solder, joalo-joalo 'Me re boetse re lokela ho ela hloko likarolo tse khethehileng haeba li ke ke tsa hlatsuoa.Aerospace le PCB ea boemo ba bongaka li ka hloekisoa ka tsela ena.
3. Half Automatic PCBA Cleaning
Ho fapana le mochini o hloekisang oa PCBA oa inthaneteng, mochini o hloekisang halofo o itirisang o ka tsamaisoa ka letsoho sebakeng leha e le sefe sa mohala oa kopano, 'me o na le sebaka se le seng feela.Leha lits'ebetso tsa eona tsa ho hloekisa li ts'oana le tlhoekiso ea PCBA ea inthaneteng, lits'ebetso tsohle li etsahala sebakeng se le seng.Li-PCBA li hloka ho lokisoa ke sesebelisoa kapa ho beoa ka basketeng, 'me bongata ba tsona bo lekanyelitsoe.
4. Bukana PCBA Cleaning
The manual PCBA cleaner e loketse bakeng sa PCBA-batch e nyenyane e hlokang solvent ea MPC ea ho hloekisa.PCBA e qeta ho hloekisa lik'hemik'hale tse thehiloeng metsing ka ho hlapa mocheso kamehla.
Re khetha mokhoa o nepahetseng ka ho fetisisa oa ho hloekisa PCBA ho itšetlehile ka litlhoko tsa PCBA.