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Technology e pā ana ki te ārai i te warping o PCB poari tā

 

1. He aha te mea te whakaritenga poari ara iahiko rawa flat
I roto i te raina kōkuhu ki aunoa, ki te kahore he flat te poari tā ara iahiko, ka meinga ai te wāhi ki te kia hē, e kore e taea te kōkuhu i te wāhanga ki te poka, me te mata o te pereti, a tae noa te plug aunoa loader.When paiherea te poari PCB i huihui wae te i muri i whakapiringa, a he uaua ki te hatepea kore e taea te tāuta hoki neatly.The PCB poari i roto i te pouaka mīhini te ateatenga i roto i te ranei te waewae o te huānga mīhini, pera, ko ano hoki te PCB whakaminenga wheketere pereti hui parori rawa hakari troublesome.At, te poari tā ara iahiko kua tomo te wā o te tāutanga mata me te tāuta kongakonga, a me waiho ake me atu tino ki te whakaritenga te ara iahiko poari whakaminenga tipu tāngia o te pereti parori.

2. Paerewa me te whakamātautau tikanga mō te whenu
E ai ki te United States IPC-6012 (1996 putanga) << mārō tāngia tāutu te poari ara iahiko me ngā mahi >>, te warping mōrahi tīkina me distortion o te mata pereti ekeeke he 0.75%, me katoa e whakaaetia atu papa PCB 1.5% kua nui haere .Ko nga whakaritenga mo te mata e ekeeke poari paraharaha o te IPC-RB-276 (1992 putanga) .I reira, te tohu whenu o te raihana o ia hiko PCB whakaminenga whakato, kahore mea rua maha-apa PCB, 1.6mm matotoru, te tikanga 0,70 ~ 0.75%, he tokomaha SMT, pereti BGA ranei, te whakaritenga, ko te 0.5% .Ko ētahi hikohiko e tino whakararuraru ana wheketere mo te hua 0.3 ōrau i roto i ngā paerewa warping, me nga mehua warping whakamātautau whai gb4677. 5-84 IPC-tm-650.2.4.22b.Put poari PCB ranei i runga i te turanga manatoko, ki te ngira whakamātautau faahuru tohu o te rohe nui rawa, ki te whakamatautau i te diameter o te ngira, wehea e te roa ānau o papa PCB, whenu ka taea te tātai tohu o te poari taiawhio tāngia.

tikanga Paerewa me te whakamātautau mō te whenu

3. warping i roto i hokohoko tukanga
hoahoa 1. Engineering: ka te hoahoa o te poari tā ara iahiko kia tuhia:
A. kia kia hangarite, pērā i te laminates ono te whakaritenga o te prepreg i waenganui i nga papa PCB Poari , te matotoru o te 1 ~ 2 a kia rite ki te maha o nga mongamonga āhua-ua haapuai 5 ~ 6 ngā papa, te kore e kia ngāwari ki te faahuru te pēhanga apa.
B. Maha-ēnei PCB matua a ka whakamahia papa āhua-whakaorangia i roto i te hua o te kaiwhakarato taua.
C. kia rite tata te rohe o te waho A me B rārangi rite possible.If te mata ko te mata parahi nui, a B he anake te rārangi torutoru, he ngāwari te pereti ki te faahuru i muri etching.If nga taha e rua o te he nui rawa te rohe raina rerekētanga, ka taea e koe te tāpiri i etahi tukutuku tau'a i te taha hiroki, i roto i te tikanga ki te taurite.

2, Baking poari i mua i te tapahi:
CCL poari tunu PCB i mua i te tapahi (150 nekehanga, 8 ± 2 haora) mo te whakaaro ko ki te tango i te makuku roto te poari, ka meinga whakaorangia te kāpia i roto i te pereti, whakakore atu te ahotea wäriu i roto i te pereti, e he āwhina ki te ārai i warping.At te poari nei, he tokomaha PCB rua-tapa, piri tonu maha-apa papa PCB ki te mua blanking-pou-tunu step.But reira e ano etahi wheketere ahumahi poari PCB, inaianei te poari PCB ara iahiko ranei ture wā poari tunu wheketere hoki maiorooro, mai i te 4 ki te 10 haora, fokotu'u e te piha haapiiraa rite ki te hanga o te tāngia poari ara iahikome te tono kiritaki mō nekehanga whenu ki te decide.Cut ki mongamonga noa ranei i muri i te wahi katoa o te tunu tunu tapahia oumu te rauemi, he whaitake nga tikanga e rua, e tūtohu ana tapahi poari i muri i te tapahi. Kia hoki te poari i roto poari maroke.

3. Ko te whenu me te weft o prepreg:
I muri i te lamination prepreg, he rerekē te na'ina'iraa i roto i whenu me te weft nga tohutohu, a me whakanuia whenu me te weft nga tohutohu ka blanking ko stacking.Otherwise, e mea ohie ki te faahuru te paraharaha oti i muri i laminating, ara, ki te he te reira pakeke ki te fakatonutonu. Maha-apa PCB take warping, he tokomaha o te lamination o te prepreg ka kihai i wehe i te whenu me te weft i waenganui, tāruarua pokanoa noa meinga e.
Me pēhea te ki te wehewehe i waenganui i ahopae me te ahopou? Hurihia ake Hurihia prepreg aronga ko te whenu, me te aronga whanui ko te weft; Ko whenu parahi poari kinaki mo te taha roa o te latitudinal, taha poto, ki te kore tino ki te tirohia ki te kaiwhakanao kaiwhakarato ranei.

4. Ahotea muri laminating:
multilayer poari PCB, i muri i te raveraa i te matao-pēhi tarai mira ranei burrs wera-pēhi, ka papatahi i runga i tunu i roto i te Celsius oumu 150 nekehanga mō te 4 haora, kia e āta tukua te ahotea intraplate ka hanga i te teriuma ora , mahue tenei taahiraa te.

5. Fie ki tika i te paraharaha i whakakikoruatia:
0.4 ~ 0.6mm kikokore poari PCB maha-apa mo te whakakikorua poari ara iahiko, me te mea whakakikorua whakairoiro kia hanga o pukapuka kini motuhake, raina whakakikorua aunoa i runga i te topenga Feiba i te whārangi, me te pae a tawhio ki te topenga katoa i runga i te Fiba e piko tahi nga aho ki te tika i te papa mania tāngia katoa i runga i te takai kia e kore nga papa paraharaha, a whakakikoruatia iho e deform. Te kore tenei mehua, i muri i whakakikoruatia e rua tekau ranei toru microns o apa parahi, ka kia piko te pepa, me uaua ki te rongoa.

6. Poari meangiti i muri i te whakaōritenga hau wera:

Ko te rangi wera o te tāngia poari ara iahiko pāngia e te pāmahana tiketike o te waka tūhoto (e pā ana ki 250 degrees). I muri te nekehia atu te reira, kia hoatu ai ki te flat mapere rino ranei pereti ki te whakamatao fakanatula, a ka te mīhini pou-tukatuka he he pai mo te warping o boards.Some wheketere cleaned.This ki te whakarei ake i te wherikotanga o te mata o te mata , tine, te poari ki te wai matao, i muri tonu wera rangi whakaōritenga i muri i te hēkona ruarua i roto i te reprocessing, he kirika taua he ru matao, mo etahi momo o papa he pea ki te whakaputa i warping, tua paparanga blister.In ranei, te ka taea e rangi moenga tere te tāpiri ki te whakamatao i te taputapu.

tukatuka poari 7. warping:

I roto i te wheketere pai-whakahaere, ka whai i te haki flatness 100% i runga i te tirohanga whakamutunga te poari. Ka kia mau papa PCB Kāore katoa i roto i, whakanohoia i roto i te oumu, tunua i 150 nekehanga pēhanga degrees, me te taimaha hoki 3 ki te 6 haora, a i raro i te pēhanga o te tautauā tūturu. Na ka ruke te rihi me te tango i te poari PCB, i roto i te haki flatness, kia taea te ora e wahi o te poari, me etahi te papa iahiko tā Me ki kia rua ki te toru nga wa te tunu i roto i te tikanga ki te level.If te anti i runga ake-whakahuatia -warping kore e tukanga mehua whakatinanahia, he maumau, whakakorehia anake etahi tunu poari.

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