Iyo yekumusoro gomo yekusangana maitiro inoshandisa matemplate senzira yechokwadi, inodzokororwa solder paste deposition. A template inoreva shizha rakatetepa kana rakatetepa rendarira kana simbi isina simbi ine dunhu rakachekwa pairi kuti rienderane nechimiro chechimiro chechigadzirwa chepamusoro (SMD) yakadhindwa redunhu bhodhi (PCB) uko template ichashandiswa. Mushure mokunge template yacho yakanyatsogadziriswa uye yakafananidzwa nePCB, simbi yesimbi inomanikidza solder paste kuburikidza nemakomba e template, zvichiita kuti iite deposits paPCB kugadzirisa SMD panzvimbo. Iyo solder paste deposits inonyungudika kana ichipfuura nepakati reflow oveni uye kugadzirisa iyo SMD paPCB.

Dhizaini ye template, kunyanya kuumbwa kwayo uye ukobvu, pamwe nechimiro uye ukuru hwemakomba, inosarudza ukuru, chimiro uye nzvimbo ye solder paste deposits, izvo zvakakosha kuti ive nechokwadi chepamusoro-kuburikidza nzira yekusangana. Semuenzaniso, kuwanda kwefoiri uye saizi yekuvhura yemakomba inotsanangura huwandu hwe slurry yakaiswa pabhodhi. Yakawandisa solder paste inogona kutungamira mukuumbwa kwemabhora, mabhiriji uye tombstones. A shoma shoma solder paste ichaita kuti solder majoini aome. Zvose zvichakuvadza basa remagetsi rebhodhi redunhu.

Optimum foil ukobvu

Mhando yeSMD pabhodhi inotsanangura iyo yakakwana foil ukobvu. Semuenzaniso, kurongedza kwechikamu senge 0603 kana 0.020 ″ pitch SOIC inoda yakatetepa solder paste template, nepo gobvu template yakanyatsokodzera zvinhu zvakaita se1206 kana 0.050 ″ pitch SOIC. Kunyangwe iwo ukobvu hwetemplate inoshandiswa pakuisa solder paste deposition kubva pa0.001 ″ kusvika 0.030 ″, iyo yakajairwa foil ukobvu hunoshandiswa pamabhodhi edunhu mazhinji kubva pa0.004 ″ kusvika 0.007 ″.

Tekinoroji yekugadzira matemplate

Parizvino, indasitiri iyi inoshandisa matekinoroji mashanu kugadzira stencils-laser kucheka, electroforming, makemikari etching uye kusanganisa. Kunyangwe iyo hybrid tekinoroji iri musanganiswa wemakemikari etching uye laser yekucheka, makemikari etching anobatsira kwazvo mukugadzira akatsikwa stencils uye hybrid stencils.

Kemikari etching yematemplate

Kemikari milling inoisa iyo simbi mask uye inochinjika simbi mask template kubva kumativi ese. Sezvo izvi zvisingaite corrodes kwete mugwara rakamira chete asiwo mudivi redivi, zvinokonzeresa madhiri uye kuita kuti kuvhura kuhombe kupfuura saizi inodiwa. Sezvo iyo etching inofambira mberi kubva kumativi ese, kukanda pamadziro akatwasuka kunoguma nekuumbwa kwechimiro che hourglass, izvo zvinozoita kuti yakawandisa solder deposits.

Sezvo etching stencil kuvhura isingaburitse mhedzisiro, indasitiri inoshandisa nzira mbiri kutsvedzerera madziro. Imwe yacho ndeye electro-polishing uye micro-etching process, uye imwe yacho nickel plating.

Kunyange zvazvo nzvimbo yakatsetseka kana yakakwenenzverwa inobatsira kusunungurwa kwepaste, inogonawo kukonzera kuti paste isvetuke pamusoro pe template pane kukunguruka ne squeegee. Iyo template inogadzira inogadzirisa dambudziko iri nekusarudza kupukuta madziro egomba panzvimbo ye template pamusoro. Kunyangwe nickel plating inogona kuvandudza kutsetseka uye kudhinda kuita kwetemplate, inogona kuderedza kuvhurika, izvo zvinoda kugadziriswa kweiyo artwork.

Template laser yekucheka

Laser yekucheka inzira yekubvisa iyo inopinza Gerber data muCNC muchina unodzora laser danda. Laser danda rinotanga mukati memuganho wegomba ropfuura neparimita raro richibvisa zvachose simbi kuti iite gomba, gomba rimwe chete panguva.

Maparamita akati wandei anotsanangura kutsetseka kwekucheka kwelaser. Izvi zvinosanganisira kucheka kumhanya, danda nzvimbo saizi, laser simba uye danda kutarisisa. Kazhinji, iyo indasitiri inoshandisa danda nzvimbo inosvika 1.25 mils, iyo inogona kucheka chaiyo apertures mune akasiyana maumbirwo uye saizi zvinodiwa. Nekudaro, maburi e-laser-akachekwa anodawo post-processing, semakomba akaiswa kemikari. Laser yekucheka mold inoda electrolytic polishing uye nickel plating kuti mukati megomba madziro atsetseke. Sezvo saizi yeaperture yakaderedzwa muchiitiko chinotevera, saizi yeaperture yekucheka laser inofanira kubhadharwa nemazvo.

Zvimiro zvekushandisa stencil kudhinda

Kudhinda nema stencils kunosanganisira maitiro matatu akasiyana. Yekutanga ndiyo nzira yekuzadza gomba, umo solder paste inozadza maburi. Yechipiri ndiyo solder paste transfer process, umo solder paste yakaunganidzwa mugomba inotamisirwa kuPCB pamusoro, uye chechitatu inzvimbo yedhipoziti solder paste. Aya matatu maitiro akakosha kuti uwane yaunoda mhedzisiro-kuisa iyo chaiyo vhoriyamu ye solder paste (inonziwo zvidhinha) munzvimbo chaiyo paPCB.

Kuzadza maburi etemplate ne solder paste kunoda simbi scraper kudzvanya solder paste mumakomba. Kutarisa kwegomba maererano ne squeegee strip kunokanganisa nzira yekuzadza. Semuenzaniso, gomba rine akiso yaro refu yakatarisa pakurohwa kweblade rinozadza zvirinani pane buri rine akiso yaro pfupi yakananga kwainoenda kune blade sitiroko. Mukuwedzera, sezvo kukurumidza kwe squeegee kunokanganisa kuzadza kwemakomba, kukurumidza kuderera kwepasi kunogona kuita kuti maburi ayo akareba axis akaenzana nekurohwa kwe squeegee zviri nani kuzadza maburi.

Mucheto we squeegee strip unobatawo kuti solder paste inozadza sei maburi e stencil. Chiitiko chinowanzoitwa ndechekudhinda paunenge uchishandisa iyo shoma squeegee kudzvanywa uchichengetedza kupukuta kwakachena kweiyo solder paste pamusoro peiyo stencil. Kuwedzera kudzvinyirirwa kwekusvina kunogona kukuvadza squeegee uye template, uyewo kunokonzera kuti paste yakasvibiswa pasi pechiso che template.

Kune rumwe rutivi, iyo yakaderera squeegee pressure inogona kusabvumira solder paste kuti isunungurwe kuburikidza nemakomba maduku, zvichiita kuti isakwana solder paPCB pads. Pamusoro pezvo, solder paste yakasara padivi pechisviniro padyo negomba hombe inogona kudhonzerwa pasi negiravhiti, zvichikonzera kuwandisa solder deposition. Naizvozvo, kumanikidzwa kushoma kunodiwa, izvo zvinozozadzisa kupukuta kwakachena kwepaste.

Kuwanda kwekumanikidzwa kunoshandiswa kunoenderanawo nemhando ye solder paste inoshandiswa. Semuenzaniso, kuenzaniswa nekushandisa tin / lead paste, kana uchishandisa lead-isina solder paste, iyo PTFE/nickel-plated squeegee inoda nezve 25-40% kuwedzera kudzvanywa.

Kuita nyaya dze solder paste uye stencils

Dzimwe nyaya dzekuita dzine chekuita nesolder paste uye stencils ndeidzi:

Ukobvu uye saizi yekuvhura kweiyo stencil foil inotaridza huwandu hunogona kuitika hwesolder paste yakaiswa paPCB pad.

Kugona kuburitsa solder paste kubva kumadziro gomba retemplate

Nzvimbo yechokwadi yezvidhinha zvekutengesa zvakadhindwa paPCB pads

Munguva yekudhinda kutenderera, apo mutsara we squeegee unopfuura nepakati pe stencil, solder paste inozadza gomba re stencil. Munguva yebhodhi / template yekuparadzanisa kutenderera, solder paste inoburitswa pamapadhi ari pabhodhi. Nenzira yakanaka, iyo yose solder paste inozadza gomba panguva yekudhinda inofanira kusunungurwa kubva pamadziro egomba uye ichiendeswa kune padhi pabhodhi kuti iite yakakwana solder zvidhinha. Nekudaro, huwandu hwekutamisa hunoenderana nechiyero chechikamu uye nharaunda reshiyo yekuvhura.

Semuenzaniso, mune iyo iyo nzvimbo yepadhi yakakura kupfuura zvikamu zviviri muzvitatu zvenzvimbo yemukati pore madziro, paste inogona kuwana kuburitswa kuri nani kupfuura 80%. Izvi zvinoreva kuti kuderedza template ukobvu kana kuwedzera gomba saizi kunogona kusunungura solder paste pasi peiyo nharaunda reshiyo.

Iko kugona kwe solder paste kuburitsa kubva kumadziro gomba retemplate kunoenderanawo nekupedza kwegomba madziro. Laser yekucheka maburi ne electropolishing uye / kana electroplating inogona kuvandudza kugona kwe slurry kutamisa. Nekudaro, kuendesa solder paste kubva kutemplate kuenda kuPCB zvakare kunoenderana nekunamira kweiyo solder paste kumadziro egomba retemplate uye kunamatira kweiyo solder paste kuPCB pad. Kuti uwane maitiro akanaka ekutamisa, iyo yekupedzisira inofanira kunge yakakura, izvo zvinoreva kuti kudhindwa kunoenderana nereshiyo yenzvimbo yetemplate yemadziro kunzvimbo yekuvhura, uchiregeredza miitiro midiki yakadai sedhizaini yekona yemadziro uye roughness yayo. .

Chinzvimbo uye chiyero chechokwadi chezvidhinha zvinotengeswa zvakadhindwa paPCB pads zvinoenderana nemhando yeCAD data data, tekinoroji uye nzira inoshandiswa kugadzira template, uye tembiricha ye template panguva yekushandisa. Mukuwedzera, kurongeka kwechinzvimbo kunoenderanawo nenzira yekuenzanisa inoshandiswa.

Yakagadzirwa template kana glued template

Iyo yakarongedzwa template parizvino ndiyo ine simba kwazvo laser yekucheka template, yakagadzirirwa kudhindisa skrini mukugadzira. Iwo akaiswa zvachose muchimiro chechimiro, uye mesh furemu inosimbisa iyo formwork foil mune formwork. Kune micro BGA uye zvikamu zvine pitch ye16 mil uye pasi, zvinokurudzirwa kushandisa template yakarongeka ine rusvingo rwakatsetseka. Kana ichishandiswa pasi pemamiriro ekushisa anodzorwa, molds dzakagadzirwa dzinopa chinzvimbo chepamusoro uye kurongeka chaiko.

Kwenguva pfupi kugadzirwa kana prototype PCB gungano, isina furemu matemplate anogona kupa yakanakisa solder paste vhoriyamu kutonga. Iwo akagadzirirwa kushandiswa ane formwork tensioning masisitimu, ayo anogona kushandiswazve formwork mafuremu, senge universal mafuremu. Sezvo molds isinganamirwe zvachose kune furemu, yakachipa zvakanyanya kupfuura furemu-mhando mold uye inotora yakawanda shoma yekuchengetera nzvimbo.