Chinangwa chikuru chePCB kubheka ndiko kudzikisira uye kubvisa zvinyoro-nyoro muPCB kana kubatwa kubva kune kunze kwenyika, nekuti zvimwe zvinhu zvinoshandiswa muPCB iyo pachayo nyore fomu mamorekuru.
Mukuwedzera, mushure mekunge PCB inogadzirwa uye yakaiswa kwenguva yakati, pane mukana wekutora unyoro mumamiriro ekunze, uye mvura ndeimwe yeanonyanya kuuraya PCB pccorn kana kuseka.
Nekuti PCB iyo PCB yakaiswa munharaunda umo tembiricha inodarika zana, yakadai seyevhenyani, kutengesa ovheni, mvura inopisa, mvura ichashanduka kuita ruvara rwemvura uye nekukurumidza kuwedzera vhoriyamu yayo.
Iyo inokurumidza kupisa inoiswa kuPCB, iyo inokurumidza mvura inowedzera; Iyo yepamusoro tembiricha, yakakura huwandu hwemaptur yemvura; Kana mupfuti wemvura asingakwanisi kutiza kubva kuPCB nekukurumidza, pane mukana wakanaka wekuwedzera PCB.
Kunyanya, iyo z nhungamiro yePCB ndiyo isina kusimba. Dzimwe nguva iyo vias pakati pezvikamu pakati pezvivakwa zvePCB inogona kuputswa, uye dzimwe nguva zvinogona kukonzera kuparadzaniswa kweiyo mataira ePCB. Kunyangwe zvakanyanya zvakakomba, kunyangwe kutaridzika kwePCB kunogona kuoneka. Zvikuru zvakadai sekupomera, kuzvimba, uye kuputika;
Dzimwe nguva kunyange kana iyo phenomena iri pamusoro isingaonekwe kunze kwePCB, yakakuvara zvakanyanya mukati. Nekufamba kwenguva, ichakonzera mabasa asina kugadzikana ezvigadzirwa zvemagetsi, kana caf nezvimwe matambudziko, uye pakupedzisira zvikonzera kutadza kwechigadzirwa.
Kuongororwa kwechikonzero chechokwadi kwePCB kuputika uye matanho ekudzivirira
Iyo PCB inokonzeresa maitiro ndeye chaizvo zvinotambudza. Panguva yekubheka, mapakeji ekutanga anofanirwa kubviswa zvisati zvaitika pacho, uye ipapo tembiricha anofanira kunge ari anopfuura zana ℃ nekuda kwekubheka, asi tembiricha haifanire kunge yakanyanya kudzivisa nguva yekubheka. Kunyanyisa kuwedzera kwemvura yemvura kuchaputika PCB.
Kazhinji, iyo PCB inobheka tembiricha iri muindasitiri inonyanya kuiswa pa120 ± 5 ° 5 ° 5 ° 5 ° 5 ° 5 °
Iyo nguva yekubheka inosiyana nekobvu uye saizi yePCB. Zvekutetepa kana hombe pcbs, iwe unofanirwa kudzvanya bhodhi nechinhu chinorema mushure mekubheka. This is to reduce or avoid PCB The tragic occurrence of PCB bending deformation due to stress release during cooling after baking.
Nekuti kamwe PCB yakaremara uye yakakotama, pachave nekukakavara kana kusanzwisisika kana kudengenyeka kana kuunganidza mutengesi weSMT, kuti vatengeserure zvitima zvisipfupi kana vatengeserari vasina mhosva panguva inotevera.
PCB inokonzeresa mamiriro ezvinhu
Parizvino, indasitiri inowanzo simudza mamiriro uye nguva yePCB inobheka seinotevera:
1. Iyo PCB yakanyatsocherechedzwa mukati memwedzi miviri yezuva rekugadzira. Mushure mekusvuta, inoiswa mune tembiricha uye yekunyoroveswa yakadzorwa nharaunda (】 30 × / 60% RH, maererano neIPC-1601) kweanopfuura mazuva mashanu usati waenda online. Bika pa12 × 5 ℃ kweawa imwe chete.
2. Iyo PCB inochengeterwa kwemwedzi 2-6 kupfuura zuva rekugadzira, uye rinofanira kubikwa pa12 × 5 × kwemaawa maviri usati waenda online.
3. Iyo PCB inochengeterwa kwemwedzi 6-12 kupfuura zuva rekugadzira, uye rinofanira kubikwa pa12 × 5 ° C kweawa maawa mana usati waenda online.
4. Kana iwe uchifanira kurishandisa, zvinokurudzirwa kuchibika na12 × 5 ° C kwemaawa matanhatu. Asati agadzira kugadzirwa, kutanga edza kudhinda zvidimbu zvidimbu zvemutengesi pasita uye ita chokwadi chekuti hapana dambudziko rekutambudzika vasati vaenderera mberi kugadzirwa.
Chimwe chikonzero ndechekuti hachikurudzirwe kushandisa PCBS iyo yakachengetwa kwenguva yakareba nekuti kurapwa kwavo kwepamhepo kuchakundikana zvishoma nezvishoma nekufamba zvishoma nezvishoma. For Enigh, hupenyu hwesherufu hweindasitiri mwedzi gumi nemaviri. Mushure menguva ino muganho, zvinoenderana negoridhe dhipoziti. Ukobvu kunoenderana nebvudzi. Kana ubvu hwakatetepa, iyo nickel denderedzwa inogona kuoneka pane yegoridhe denderedzwa nekuda kwekusiyana uye fomu oxidation, inokanganisa kuvimbika.
5. Zvese PCBS yakabikwa inofanira kushandisirwa mukati memazuva mashanu, uye isina kuchengetedzwa PCBS inofanira kubikwa zvakare pa120 ° 5 ° C kweimwe 1 awa isati yasvika online.