Ha PCBA sebetsa, tjheseletsa boleng ba boto oa potoloho na le tšusumetso e khōlō ka tshebetso le ponahalo ea boto oa potoloho.Ka hona, ho bohlokoa haholo ho laola boleng ba tjheseletsa ba boto ea potoloho ea PCB.Boto ea potoloho ea PCBboleng ba ho tjheseletsa bo amana haufi-ufi le moralo oa boto ea potoloho, lisebelisoa tsa ts'ebetso, theknoloji ea welding le lintlha tse ling.
一、Moqapi oa boto ea potoloho ea PCB
1. Moralo oa pad
(1) Ha ho etsoa liphahlo tsa likarolo tsa plug-in, boholo ba pad bo lokela ho etsoa ka nepo.Haeba pad e le khōlō haholo, sebaka sa ho jala sa solder se seholo, 'me metsoako ea solder e entsoeng ha e tletse.Ka lehlakoreng le leng, tsitsipano e ka holim'a foil ea koporo ea pad e nyenyane e nyenyane haholo, 'me li-solder tse entsoeng ke li-solder tse se nang metsi.Lekhalo le ts'oanang pakeng tsa lesoba le likarolo tsa likarolo li kholo haholo 'me ho bonolo ho baka soldering ea bohata.Ha lesoba le le bophara ba 0.05 - 0.2mm ho feta loto mme bophara ba pad bo le makhetlo a 2 - 2.5 ho feta, ke boemo bo loketseng bakeng sa ho cheselletsa.
(2) Ha ho etsoa liphahlo tsa likaroloana tsa chip, lintlha tse latelang li lokela ho nkoa: E le ho felisa "phello ea moriti" ka hohle kamoo ho ka khonehang, li-terminals tsa soldering kapa li-pin tsa SMD li lokela ho tobana le tataiso ea phallo ea tin ho thusa. ho kopana le phallo ya thini.Fokotsa li-solder tse fosahetseng le tse sieo tsa solder.Likarolo tse nyenyane ha lia lokela ho behoa ka mor'a likarolo tse kholo ho thibela likarolo tse kholo ho kena-kenana le phallo ea solder le ho kopana le liphahlo tsa likaroloana tse nyenyane, e leng se etsang hore ho be le ho lutla ha solder.
2, PCB oa potoloho boto taolo flatness
Wave soldering e na le litlhoko tse phahameng holim'a ho bata ha mapolanka a hatisitsoeng.Ka kakaretso, letlapa la ntoa le hlokahala hore le be ka tlase ho 0.5mm.Haeba e le kholo ho feta 0.5mm, e hloka ho batalatsoa.Haholo-holo, botenya ba mapolanka a mang a hatisitsoeng bo ka ba 1.5mm feela, 'me litlhoko tsa bona tsa warpage li phahame.Ho seng joalo, boleng ba welding bo ke ke ba tiisetsoa.Lintlha tse latelang li lokela ho eloa hloko:
(1) Boloka ka nepo liboto tse hatisitsoeng le likaroloana 'me u khutsufatse nako ea polokelo ka hohle kamoo ho ka khonehang.Nakong ea ho cheselletsa, foil ea koporo le karolo ea pele e se nang lerōle, mafura le li-oxide li thusa ho theha manonyeletso a solder a tšoanelehang.Ka hona, mapolanka le likarolo tse hatisitsoeng li lokela ho bolokoa sebakeng se omileng., sebakeng se hloekileng, le ho khutsufatsa nako ea polokelo ka hohle kamoo ho ka khonehang.
(2) Bakeng sa mapolanka a hatisitsoeng a behiloeng ka nako e telele, ka kakaretso bokaholimo bo hloka ho hloekisoa.Sena se ka ntlafatsa solderability le ho fokotsa soldering ea bohata le borokho.Bakeng sa likaroloana tse nang le tekanyo e itseng ea oxidation ea holim'a metsi, bokaholimo bo lokela ho tlosoa pele.oxide lera.
二.Taolo ea boleng ba lisebelisoa tsa ts'ebetso
Ho solder ea maqhubu, lisebelisoa tsa mantlha tse sebelisoang ke: flux le solder.
1. Ho sebelisoa ha flux ho ka tlosa li-oxide ho tloha sebakeng sa welding, ho thibela ho tsosolosoa ha oxidation ea solder le holim'a welding nakong ea welding, ho fokotsa tsitsipano ea holim'a solder, le ho thusa ho fetisetsa mocheso sebakeng sa welding.Flux e bapala karolo ea bohlokoa taolong ea boleng ba welding.
2. Taolo ea boleng ba solder
Sehlahisoa sa tin-lead se ntse se tsoela pele ho oxidize mocheso o phahameng (250 ° C), se etsa hore likahare tsa thini tsa solder ea tin-lead ka pitseng ea thini li fokotsehe ka ho tsoelang pele le ho kheloha ntlha ea eutectic, e leng se bakang mathata a metsi a fokolang le a boleng a kang a tsoelang pele. solder, solder e se nang letho, le matla a sa lekaneng a solder..
三、 Taolo ea paramente ea Welding process
Tšusumetso ea litekanyo tsa ts'ebetso ea welding holim'a boleng ba welding e batla e rarahane.
Ho na le lintlha tse 'maloa tsa sehlooho: 1. Taolo ea mocheso oa preheating.2. Welding pina tšekamelo angle.3. Bolelele ba maqhubu a maqhubu.4. Mocheso oa ho cheselletsa.
Welding ke mohato oa bohlokoa oa ts'ebetso ts'ebetsong ea tlhahiso ea boto ea potoloho ea PCB.E le ho etsa bonnete ba hore boleng ba tjheseletsa ba boto ea potoloho, motho o lokela ho ba le tsebo ea mekhoa ea ho laola boleng le tsebo ea ho cheselletsa.
