Chinangwa chikuru che PCB kubheka kushambidza uye kubvisa humidifify, kubvisa hunyoro hunowanikwa mukati kana kumedzwa kubva kunze kwePCB, nekuti zvimwe zvinhu zvePCB zviri nyore kugadzira mamorekuru emvura.

Uye zvakare, PCBS zvakare ine mukana wekupinza hunyoro mukati mezvakatipoteredza mushure mekugadzirwa uye kuratidzwa kwenguva yakati, uye mvura ndiyo imwe yemakonzeresa epipi kana delamination. Kana pcb yakaiswa munzvimbo ine tembiricha iri pamusoro pe100 ℃, senge backweld furna, wave wave, inopisa mweya kuumbwa kana ruoko rwekutenderera mawoko, mvura inozoshanduka kuita chiutsi uye nekukurumidza kuwedzera huwandu hwayo.

Iyo inokurumidza iyo PCB inopisa, nekukurumidza iyo mvura mhute inowedzera. Iyo yakakwirira tembiricha, inowedzera huwandu hwemvura yemvura; Kana mhute yemvura isingakwanise kutiza kubva paPCB munguva, ine mukana wakanaka wekufutisa iyo PCB.

Zvikurukuru, iyo Z inotungamira pcb ndiyo inoshupika, dzimwe nguva inogona kutyora iyo kuburikidza pakati pezvikamu zvePCB, dzimwe nguva zvinogona kukonzera kupatsanurana pakati pezvikamu zvePCB, kunyangwe kuoneka kwePCB kunogona kuoneka kuputika, kuwedzera, kuputika kwebhodhi uye zvimwe zviitiko;

Dzimwe nguva, kunyangwe iyo pcb isingaoni chiitiko chiri pamusoro pamusoro, chiri mukati chakanganisika. Nekufamba kwenguva, zvinokonzeresa kusagadzikana kwebasa kwezvigadzirwa zvemagetsi, kana CAF nemamwe matambudziko, uye pakupedzisira zvinotungamira mukukundikana kwechigadzirwa.

Icho chaicho chikonzero chekuongorora uye chekudzivirira matanho ePBB akaputika bhodhi

Muchokwadi, maitiro ePCB kubheka anonetsa kwazvo. Iyo yekutanga kurongedza inofanirwa kubviswa isati yaiswa muchoto, uye ipapo tembiricha inofanirwa kuve inopfuura 100 ℃, asi iyo tembiricha haifanire kuve yakanyanya kukwirira, kuitira kuti iyo PCB izoputika nekuda kwekuwedzeredza kuwanda kwemhepo yemvura panguva yekubheka.

Kazhinji, tembiricha yekubheka yePBB inowanzoiswa pa120 ± 5 ℃ muindasitiri kuti ive nechokwadi chekuti hunyoro hunogona kunyatsobviswa mumuviri wePCB mutsara weSMT usati wadhirowa kuburikidza neshure rekusvira choto.

Nguva yekubheka inosiyana nehupamhi uye saizi yePBB, uye yePBB ine huremu hwakaonda kana hukuru, bhodhi rinofanira kumanikidzwa nehuremu hunorema mushure mekubheka, kuitira kuti kuderedze kana kudzivirira dambudziko rePCB rinokombama deformation rinokonzerwa nekushushikana kusunungurwa panguva Pcb kutonhora mushure mekubheka.

Nekuti kana iyo pcb yakaremara uye yakakombama, dambudziko reoffset kana isina kuenzana ukobvu richaitika kana SOLDER paste yakadhindwa paSMT, inozotungamira kunhamba huru yewelding pfupi diki kana isina chinhu kutenderera uye zvimwe zviitiko zvakashata.

Pcb kubheka ezvinhu marongero

At present, the general conditions and time Settings for PCB baking are as follows:

1.Pcbb ichave yakasimbiswa zvakanaka mukati memwedzi miviri kubva pazuva rekugadzirwa. Kana iyo pcb isina kuvharwa uye ikaiswa munzvimbo yekupisa-mwando inodzorwa nharaunda (≦ 2 ℃ / 30% RH, zvinoenderana neIPC-60) kwemazuva anopfuura mashanu, ichabikwa pa1601 ± 5 ℃ kwe120 awa isati yaiswa. pamutsetse.

2. Pcb inochengetwa kweinopfuura 2 ~ 6 mwedzi mushure mezuva rekugadzira, uye rinobikwa kwemaawa maviri pa2 ± 120 ℃ pamberi pe-online.

3. Pcb inofanira kuchengetwa kweinopfuura 6 ~ 12 mwedzi, uye yakagochwa kwemaawa mana pa4 ± 120 ℃ isati yaenda online.

4, pcb yekuchengetera inopfuura mwedzi gumi nemaviri yezuva rekugadzira, risingakurudzirwe kushandisa, nekuti simba rekunamatira re multilayer board asi richange richikwegura nenguva, chigadzirwa chigadzirwa kusagadzikana uye mamwe matambudziko ehunhu anogona kuitika mune ramangwana, kuwedzera mukana wemusika kugadzirisa, uye maitiro ekugadzira ane kuputika kwebhodhi uye tin kudya kudya kwakashata. Kana iwe uchifanira kushandisa, zvinokurudzirwa kubheka pa120 ± 5 ℃ kwemaawa matanhatu, huwandu hukuru hwepamberi-kudhinda solder paste mukugadzirwa kuve nechokwadi chekuti hapana dambudziko rekusungira usati waenderera kugadzirwa.

Imwe haina kukurudzirwa kwenguva yakareba iyo pcb nekuda kwekurapwa kwayo kwepamusoro nenguva uye zvishoma nezvishoma zvakare ichakundikana, muEnIG, hupenyu hwesherufu mwedzi gumi nemiviri, mushure menguva ino, zvinoenderana nehuremu hwayo hwegoridhe, kana ukobvu hwautete, nickel rukoko anogona kunge ari nekuti kutsauka uye kuoneka mune yegoridhe dura uye oxide kuumbwa, kukanganisa kuvimbika, hakugone kusaziva.

5. Yese yakabikwa PCBS inofanira kushandiswa mukati memazuva mashanu, uye isina kugadziriswa PCBS inofanira kubikwa pa5 ± 120 ℃ yeimwe 5 awa usati waenda online.

Kuisira pcb panguva yekubheka

1. Puruji yakakura inofanira kuiswa yakatwasuka uye yakarongedzwa painobikwa. Zvinokurudzirwa kuti huwandu hwekuwanda kwesitaki haufanire kudarika zvidimbu makumi matatu. Vertical kubheka haina inokurudzirwa hombe saizi pcb, nyore kukotama.

2. Kana uchibheka diki uye yepakati-saizi pcb, inogona kuiswa yakatwasuka uye yakarongedzwa, iyo yakanyanya kuwanda sitaki haipfuuri makumi mana zvidimbu, kana inogona kushandiswa yakatwasuka uye nhamba haina kuganhurirwa. Mushure memaminitsi gumi ekubheka, zvinodikanwa kuvhura ovhoni uye kutora iyo PCB uye kuiisa yakatwasuka kuti itonhorere.

Zvinyorwa zvePCB kubheka

1. Iyo tembiricha yekubheka haifanirwe kupfuura iyo Tg poi yePCB, uye kazhinji haifanirwe kudarika 125 ℃. Pakutanga nhanho, iyo Tg poindi yeimwe pcb yaive nemutobvu yaive shoma, asi ikozvino iyo Tg yemazhinji pcb isina lead iri pamusoro pe150 ℃.

2, mushure mekubheka pcb inofanira kushandiswa nekukurumidza sezvinobvira, kana isingashandiswe, inofanirwa kuve-yekuchenesa kurongedza nekukurumidza sezvazvinogona. Kana ikaziviswa kumusangano kwenguva refu, inofanira kubikwa zvekare.

3, ovhoni rangarira kuisa chiutsi chekuomesa michina, zvikasadaro iyo yakabikwa mhute yemvura inochengetwa muchoto kuti iwedzere hunyoro hwehukama, yakashata pcb dehumidification.

4. Kubva pakuona kwemhando yepamusoro, iyo inonatsiridza iyo PCB inogadziriswa iri, zvirinani mhando yacho ichave mushure mekupfuura nemuvira. Iyo yakapera basa pcb ichave nehumwe mhando njodzi kunyange kana ikashandiswa mushure mekubheka.

Mazano ePCB kubheka

1. Inokurudzirwa kuti ubike pcb pa105 ± 5 ℃ sekureba sekunge nzvimbo yekubikira yemvura iri 100 ℃. Chero bedzi nzvimbo yekubikira yapfuura, mvura inozoshandurwa kuita chiutsi. Nekuti PCBS haina mamorekuru emvura akawandisa, haadi tembiricha yakakwira kuti iwedzere kumhanya kwegasi.

Iyo tembiricha yakanyanya kukwirira kana iyo gasification kumhanya yakanyanya kukurumidza, asi zviri nyore kuita kuti kukurumidza kuwedzere kwemvura mhute, iyo iri chaizvo yakaipa kune iyo mhando, kunyanya kune akawanda-maseru bhodhi uye PCB ine maburi akavigwa. 105 ℃ ingori yakakwira kupfuura iyo inovira mvura, uye tembiricha haina kukwirira zvakanyanya, izvo zvinogona kudzikisira uye kudzikisira njodzi ye oxidation. Uye kwanhasi kudzora tembiricha kudzora kugona kwave kuri nani zvakanyanya kupfuura nakare.

2, KUNYANYA iyo pcb inoda kubikwa, inofanirwa kuona kana kurongedza kuri kunyorova, ndiko kuti, kucherechedza VACUUM kurongedza kweiyo HIC (Humidity Indicator Kadhi, Humidity Indicator Kadhi) yakaratidza hunyoro, kana iko kurongedza kwakanaka, HIC inoita isingaratidze hunyoro ndeyechokwadi inogona kuve yakananga online pasina kubheka.

3. Zvinokurudzirwa kushandisa “yakatwasuka” uye yakatsemurwa kubheka kwePBB kubheka, nekuti chete nenzira iyi ndiyo inopisa mweya convection inozadzisa yakanyanya mhedzisiro, uye mvura mhute iri nyore kubikwa kunze kwePCB. Nekudaro, kune yakakura saizi PCBS, zvingave zvakakosha kuti utarise kana iyo mhando yakatwasuka inokonzeresa kuti ndiro yakotama.

4. Zvinokurudzirwa kuti PCB iiswe panzvimbo yakaoma uye itonhorere nekukurumidza mushure mekubheka. Zviri nani kumanikidza iyo “anti-ndiro yekukotama fixture” pamusoro pebhodhi, nekuti chinhu chakazara chiri nyore kutora hunyoro kubva kune inopisa nyika kusvika kune inotonhorera maitiro, asi iyo yekukurumidza kutonhora inogona kukonzera bhodhi kukotama, iyo inoda kuwana chiyero.

Zvakaipira pcb kubheka uye nenyaya dzinoda kutariswa

1. Kubheka kunowedzera kukosheswa kwePBB yekumhara kwepamusoro, uye kukwirira kwetembiricha, kureba kwacho kuri kusingafadze. 2, hazvikurudzirwi kuita yakanyanya tembiricha kubheka pane OSP pamusoro yakarapwa bhodhi, nekuti OSP firimu inozodzikisira kana kukundikana nekuda kwepamusoro tembiricha. Kana iwe uchifanira kubheka, zvinokurudzirwa kubheka pa105 ± 5 ℃ pasina anopfuura maawa maviri. Inokurudzirwa kushandisa kumusoro mukati maawa makumi maviri nemana mushure mekubheka.

3, kubheka kunogona kukanganisa chizvarwa cheMMC, kunyanya kuHASL (tinini yekumwaya), ImSn (kemikari tini, kudhiraina tini) kurapwa kwepamusoro pebhodhi, nekuti iyo IMC rukoko (mhangura gaba remubatanidzwa) chaizvo sekutanga padanho rePCB yakagadzirwa, ndiko kuti, pamberi peGENERATION yePCB solder, kubheka kunowedzera hukobvu hwetambo iyi hwakagadzirwa IMC, Zvinokonzera matambudziko ekuvimba.