Mokhoa oa ho sebelisa solder peista tshebetso PCBA?
(1) Mokhoa o bonolo oa ho ahlola li-viscosity tsa peista ea solder: Hlohlelletsa peista ea solder ka spatula bakeng sa metsotso e ka bang 2-5, nka pente e nyenyane ea solder ka spatula, 'me u tlohele pente ea solder e oele fatše ka tlhaho.Viscosity e itekanetse;haeba pente ea solder e sa theohe ho hang, viscosity ea solder paste e phahame haholo;haeba solder paste e ntse e theoha kapele, viscosity ea solder paste e nyane haholo;
(2) Maemo a polokelo ea pente ea solder: sehatsetsing ka mokhoa o tiisitsoeng mocheso oa 0 ° C ho ea ho 10 ° C, 'me nako ea polokelo ka kakaretso ke likhoeli tse 3 ho isa ho tse 6;
(3) Ka mor'a hore pente ea solder e ntšoe ka sehatsetsing, e tlameha ho futhumatsoa mocheso oa kamore ka lihora tse fetang 4 pele e ka sebelisoa.Mokhoa oa ho futhumatsa o ke ke oa sebelisoa ho khutlela mocheso;ka mor'a hore pente ea solder e futhumale, e hloka ho tsosoa (e kang ho kopanya le mochine, ho hlohlelletsa 1-2 Metsotso, ho hlohlelletsa ka letsoho ho hloka ho tsosoa ka metsotso e fetang 2) pele e sebelisoa;
(4) Thempereichara ea tikoloho bakeng sa khatiso ea solder paste e lokela ho ba 22℃～28℃, 'me mongobo o be ka tlase ho 65%;
(5) Khatiso ea solder paste
1. Ha u hatisa solder peista, ho kgothaletswa ho sebelisa solder peista le dikahare tsa tšepe tsa 85% ho 92% le bophelo ba tšebeletso ea lihora tse fetang 4;
2. Lebelo la ho hatisa Nakong ea khatiso, lebelo la ho tsamaea la squeegee ho template ea khatiso ke ea bohlokoa haholo, hobane solder paste e hloka nako ea ho phalla le ho phalla ka har'a lesoba la die.Phello e betere ha peista ea solder e phalla ka ho lekana holim'a stencil.
3. Khatello ea khatiso Khatello ea khatiso e tlameha ho hokahanngoa le boima ba squeegee.Haeba khatello e le tlase haholo, squeegee e ke ke ea hloekisa pente ea solder holim'a template.Haeba khatello e le khōlō haholo kapa squeegee e le bonolo haholo, squeegee e tla teba ho template.Cheka pente ea solder ho tloha ka sekoting se seholo.Foromo e matla ea khatello: Sebelisa scraper holim'a thempleite ea tšepe.E le hore u fumane khatello e nepahetseng, qala ka ho sebelisa 1 kg ea khatello bakeng sa 50 mm ea bolelele ba scraper.Ka mohlala, 300 mm scraper e sebelisa khatello ea 6 kg ho fokotsa butle-butle khatello.Ho fihlela solder peista qala ho lula thempleite 'me e sa scratched hloekileng, ka nako eo butle-butle eketsa khatello ho fihlela solder peista e feela scratched tima.Ka nako ena, khatello e nepahetse.
4. Sistimi ea taolo ea ts'ebetso le melaoana ea ts'ebetso E le ho fihlela liphetho tse ntle tsa khatiso, hoa hlokahala ho ba le lisebelisoa tse nepahetseng tsa solder paste (viscosity, dikahare tsa tšepe, boholo ba phofo le ts'ebetso e tlase ka ho fetesisa ea flux), lisebelisoa tse nepahetseng (mochine oa khatiso, template. le Motsoako oa scraper) le mokhoa o nepahetseng (boemo bo botle, ho hloekisa le ho hlakola).Ho ea ka lihlahisoa tse fapaneng, beha mekhahlelo e tsamaisanang le mokhoa oa khatiso lenaneong la khatiso, joalo ka mocheso o sebetsang, khatello ea ho sebetsa, lebelo la squeegee, lebelo la demoulding, potoloho ea ho hloekisa template, joalo-joalo Ka nako e ts'oanang, hoa hlokahala ho theha ts'ebetso e thata. tsamaiso le melaoana ea tsamaiso.
① Sebelisa pente ea solder nakong ea ts'ebetso ho latela mofuta o khethiloeng.Paste ea solder e lokela ho bolokoa ka sehatsetsing ka matsatsi a beke.E lokela ho behoa mocheso oa kamore bakeng sa lihora tse fetang 4 pele e sebelisoa, ebe sekwahelo se ka buloa hore se sebelisoe.Sekhahla sa solder se sebelisitsoeng se lokela ho koaloa ebe se bolokoa ka thoko.Hore na boleng bo tšoaneleha.
② Pele ho tlhahiso, opereishene o sebelisa thipa e khethehileng ea tšepe e sa hloekang ho hlohlelletsa peista ea solder ho e lokisa.
③ Kamora tlhahlobo ea pele ea khatiso kapa tokiso ea lisebelisoa mosebetsing, sehlahlobi sa botenya ba solder se tla sebelisoa ho lekanya botenya ba khatiso ea pente ea solder.Lintlha tsa teko li khethiloe ka lintlha tsa 5 holim'a teko ea holim'a boto e hatisitsoeng, ho kenyeletsa le holimo le ka tlaase, ho le letšehali le ho le letona le lintlha tse bohareng, le ho tlaleha litekanyetso.Botenya ba peista ea solder bo tloha ho -10% ho ea ho +15% ea botenya ba template.
④ Nakong ea ts'ebetso ea tlhahiso, tlhahlobo ea 100% e etsoa ho boleng ba khatiso ea solder paste.Litaba tse ka sehloohong ke hore na mohlala oa solder peista o phethehile, hore na botenya bo lekana, le hore na ho na le tipping ea solder paste.
⑤ Hloekisa template ho latela litlhoko tsa ts'ebetso ka mor'a hore mosebetsi o phethoe.
⑥ Kamora liteko tsa khatiso kapa ho hloleha ho hatisa, pente ea solder botong e hatisitsoeng e lokela ho hloekisoa ka botlalo ka lisebelisoa tsa ho hloekisa tsa ultrasonic le ho omisoa, kapa ho hloekisoa ka joala le khase e nang le khatello e matla ho thibela letlapa la solder botong hore le se ke la bakoa ha le etsoa. sebedisoa hape.Libolo tsa solder le liketsahalo tse ling ka mor'a hore reflow soldering
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Nako ea poso: Jul-21-2020