1. PCB pamusoro kurapwa:

Anti-oxidation, tin spray, lead-isina tin spray, kunyudza goridhe, kunyudza tini, kunyudza sirivha, yakaoma goridhe plating, yakazara bhodhi goridhe plating, goridhe chigunwe, nickel palladium goridhe OSP: yakaderera mutengo, yakanaka solderability, yakaoma kuchengetedza mamiriro, nguva. Ipfupi, tekinoroji inoshamwaridzana nenharaunda, yakanaka welding uye yakatsetseka.

Kupfapfaidza tin: Iyo yekupfapfaidza tin ndiro inowanzoita multilayer (4-46 layer) yakakwirira-chaiyo PCB modhi, iyo yakashandiswa neakawanda makuru ekukurukurirana epamba, komputa, midziyo yekurapa uye mabhizinesi emuchadenga uye zvikamu zvekutsvagisa. Chigunwe chegoridhe (chigunwe chekubatanidza) ndicho chikamu chekubatanidza pakati pememori bar uye memory slot, masaini ese anofambiswa kuburikidza neminwe yegoridhe.

Chigunwe chegoridhe chinoumbwa nezvakawanda zvegoridhe yellow conductive contacts. Nekuda kwekuti nzvimbo yacho ine goridhe-yakaputirwa uye maconductive contacts akarongwa seminwe, inonzi “goridhe chigunwe”.

Chigunwe chegoridhe chakanyatso kuputirwa nedhiri yegoridhe pabhodhi yakavharwa nemhangura kuburikidza nemaitiro akakosha, nekuti goridhe rinopokana zvakanyanya neoxidation uye ine yakasimba conductivity.

Nekudaro, nekuda kwemutengo wakakwira wegoridhe, yakawanda yendangariro zvino inotsiviwa nerata plating. Kubva kuma1990, zvinhu zvemarata zvave zvakakurumbira. Parizvino, “zvigunwe zvegoridhe” zvemabhodhi eamai, ndangariro uye makadhi emifananidzo zvinenge zvese zvinoshandiswa. Tin zvinhu, chikamu chete chenzvimbo dzekuonana dzepamusoro-inoshanda maseva / nzvimbo dzekushandira zvicharamba zvakaputirwa negoridhe, izvo zvinodhura zvakasikwa.

2. Sei kushandisa goridhe-plated mahwendefa

Sezvo chiyero chekubatanidza cheIC chichikwira nekukwirira, IC pini dzinowedzera kusimba. The vertical spray tin process inonetsa kupfavisa mapadhi matete, izvo zvinounza kuomerwa pakuiswa kweSMT; nekuwedzera, hupenyu hwesherufu yeplate yepfapfaidzo ipfupi.

Iyo goridhe-yakaputirwa bhodhi inongogadzirisa matambudziko aya:

1. Yekukwirisa kwepamusoro pekuita, kunyanya ye0603 uye 0402 ultra-small surface mounts, nekuti kupfava kwepadhi kwakanangana nehunhu hweiyo solder paste kudhinda maitiro, ine simba rakasimba pamhando yekuzoyerera kunotevera. soldering, saka iyo bhodhi yese Goridhe plating yakajairika mune yakakwira-density uye yekupedzisira-diki pamusoro pekuisa maitiro.

2. Muchikamu chekugadzirwa kwekuedza, nekuda kwezvinhu zvakadai sechikamu chekutenga, kazhinji haisi iyo bhodhi inotengeswa pakarepo kana yasvika, asi inowanzoshandiswa kwemavhiki akawanda kana kunyange mwedzi. Upenyu hwesherufu yebhodhi-yakapetwa goridhe iri nani pane iyo yemutobvu. Tin alloy yakawanda nguva refu, saka munhu wese anofara kuishandisa.

Kunze kwezvo, mutengo wegoridhe-yakanamirwa PCB muchikamu chemuenzaniso wakada kufanana neiyo yelead-tin alloy board.

Asi sezvo wiring inova yakaoma, mutsetse wehupamhi uye nzvimbo yasvika 3-4MIL.

Naizvozvo, dambudziko regoridhe wire short circuit rinounzwa: sezvo kuwanda kwechiratidzo kunowedzera uye kwakakwira, kufambisa kwechiratidzo mu-multi-plated layer kunokonzerwa neganda mhedzisiro kune pesvedzero yakajeka pamhando yechiratidzo.

Iyo ganda mhedzisiro inoreva: yakakwira frequency alternating ikozvino, iyo yazvino inozoita inotarisisa pamusoro peiyo waya kuti ifambe. Maererano nekuverenga, kudzika kweganda kunobatana nehuwandu.

Kuti ugadzirise matambudziko ari pamusoro emabhodhi akaputirwa negoridhe, maPCB anoshandisa goridhe-akapfatwa mabhodhi anonyanya kuve neanotevera maitiro:

1. Nekuda kwekuti chimiro chekristaro chinoumbwa nekunyudza goridhe negoridhe chakaiswa zvakasiyana, goridhe rekunyudza richava regoridhe yero pane kupfekedzwa kwegoridhe, uye vatengi vachagutsikana zvakanyanya.

2. Kunyudzwa kwegoridhe kuri nyore kupinza pane kupfekedza goridhe, uye hakuzokonzerese kushomeka kwakashata uye kukonzera kunyunyuta kwevatengi.

3. Nekuti kunyudzwa kwegoridhe bhodhi rine nickel negoridhe chete padhi, iyo chiratidzo chekufambisa mune ganda mhedzisiro haizokanganisa chiratidzo pane yemhangura layer.

4. Nekuti kunyudza goridhe ine denser crystal chimiro pane goridhe plating, hazvisi nyore kugadzira oxidation.

5. Nekuti kunyudza goridhe bhodhi rine nickel negoridhe chete pamapadhi, haizobudise waya dzegoridhe uye kukonzera kushoma kushoma.

6. Nekuti kunyudzwa kwegoridhe bhodhi rine nickel negoridhe chete pamapadhi, iyo solder mask padunhu uye copper layer zvakasungwa zvakanyanya.

7. Iyo purojekiti haizokanganisa chinhambwe pakuita muripo.

8. Nekuti chimiro chekristaro chakaumbwa nekunyudza goridhe uye goridhe plating chakasiyana, kushushikana kweplate yegoridhe yekunyudzwa kuri nyore kudzora, uye kune zvigadzirwa zvine bonding, zvinonyanya kukonzeresa kusungirira kugadzirisa. Panguva imwecheteyo, imhaka yekuti goridhe rekunyudzwa rakapfava kupfuura kugidha, saka ndiro yegoridhe yekunyudzwa haipotere semunwe wegoridhe.

9. Kunaka kwepuranga regoridhe rakanyudzwa uye kumira-mira kwakanyatsofanana nepuranga rakaputirwa negoridhe.

Kune iyo gilding process, mhedzisiro yetinning inodzikiswa zvakanyanya, nepo tinning mhedzisiro yegoridhe yekunyudza iri nani; kunze kwekunge mugadziri achida kusunga, vagadziri vazhinji vava kuzosarudza iyo yekunyudza goridhe maitiro, ayo anowanzo zivikanwa Pasi pemamiriro ezvinhu, iyo PCB yekumusoro kurapwa kunotevera:

Goridhe plating (electroplating goridhe, kunyudza goridhe), sirivheri plating, OSP, tin spraying (lead uye lead-isina).

Aya marudzi anonyanya kuitirwa FR-4 kana CEM-3 nemamwe mabhodhi. Iyo pepa base zvinhu uye pamusoro pekurapa nzira ye rosin coating; kana tin isiri yakanaka (yakaipa tin kudya), kana solder paste uye vamwe chigamba vagadziri vasingabatanidzi Nezvikonzero kugadzirwa uye zvinhu tekinoroji.

Heino chete yePCB dambudziko, pane zvinotevera zvikonzero:

1. Munguva yePCB yekudhinda, kana pane mafuta-permeable film surface pane PAN position, iyo inogona kuvhara kushanda kwetinning; izvi zvinogona kusimbiswa ne tin bleaching test.

2. Pasinei nokuti nzvimbo yekuzora yePAN inosangana nezvinodiwa zvekugadzira, kureva, kana basa rekutsigira rechikamu rinogona kuvimbiswa panguva yekugadzirwa kwepadhi.

3. Kunyangwe iyo padhi yakasvibiswa, izvi zvinogona kuwanikwa neion kusvibiswa bvunzo; mapoinzi matatu ari pamusoro ndiwo akakosha anoonekwa nevagadziri vePCB.

Nezve zvakanakira uye zvakaipira nzira dzinoverengeka dzekurapa kwepamusoro, imwe neimwe ine simba rayo uye kushaya simba!

Panyaya yekuputirwa negoridhe, inogona kuchengeta maPCB kwenguva yakareba, uye inoenderana nekushanduka kudiki mukupisa uye hunyoro hwekunze kwezvakatipoteredza (zvichienzaniswa nekumwe kurapwa kwepamusoro), uye kazhinji inogona kuchengetwa kwerinenge gore; iyo tin-sprayed pamusoro pekurapa ndeyechipiri, OSP zvakare, iyi Kutarisisa kwakawanda kunofanirwa kubhadharwa kunguva yekuchengetera yezviviri zvekurapwa kwepamusoro pane ambient tembiricha uye mwando.

Mumamiriro ezvinhu akajairwa, kurapwa kwepamusoro kwesirivheri yekunyudza kwakasiyana zvishoma, mutengo wakakwira zvakare, uye mamiriro ekuchengetedza ari kunyanya kudiwa, saka inoda kuiswa mupepa risina sarufa! Uye nguva yekuchengetedza inenge mwedzi mitatu! Panyaya yemhedzisiro yetinning, kunyudza goridhe, OSP, kupfapfaidza marata, nezvimwewo zvakafanana, uye vagadziri vanonyanya kufunga nezvekudhura-kushanda!