Chidziwitso Chogwirizana ndi Reflow Oven

Dziwani zambiri zokhudzana ndi uvuni

Reflow soldering imagwiritsidwa ntchito pa msonkhano wa SMT, womwe ndi gawo lofunikira kwambiri la SMT.Ntchito yake ndi kusungunula phala solder, kupanga pamwamba msonkhano zigawo zikuluzikulu ndi PCB mwamphamvu chomangira pamodzi.Ngati sichikhoza kuyendetsedwa bwino, idzakhala ndi zotsatira zoopsa pa kudalirika ndi moyo wautumiki wa mankhwala.Pali njira zambiri zowotcherera reflow.Njira zodziwika kale ndi infrared ndi gasi-gawo.Tsopano opanga ambiri amagwiritsa ntchito kuwotcherera kwa mpweya wotentha, ndipo zochitika zina zapamwamba kapena zapadera zimagwiritsa ntchito njira zowonjezera, monga mbale yotentha, kuwala koyera, ng'anjo yowongoka, ndi zina zotero.

1. Kuwotcherera kwa mpweya wotentha

Tsopano, ng'anjo zambiri za reflow soldering zimatchedwa ng'anjo zowotchera mokakamiza.Imagwiritsa ntchito fani yamkati powombera mpweya wotentha kapena kuzungulira mbale ya msonkhano.Ubwino umodzi wa ng'anjoyi ndikuti pang'onopang'ono umapereka kutentha kwa mbale ya msonkhano, mosasamala kanthu za mtundu ndi mawonekedwe a zigawozo.Ngakhale, chifukwa cha makulidwe osiyanasiyana ndi kachulukidwe kagawo, kuyamwa kwa kutentha kumatha kukhala kosiyana, koma ng'anjo yokakamiza imatenthetsa pang'onopang'ono, ndipo kusiyana kwa kutentha pa PCB yomweyo sikusiyana kwambiri.Kuphatikiza apo, ng'anjoyo imatha kuwongolera kutentha kwakukulu ndi kutentha kwapakati pa kutentha komwe kumaperekedwa, komwe kumapereka malo abwinoko okhazikika komanso njira yowongolera ya reflux.

2. Kugawa kwa kutentha ndi ntchito

Popanga kuwotcherera kwa mpweya wotentha, phala la solder liyenera kudutsa magawo awa: kusungunuka kwa zosungunulira;flux kuchotsa okusayidi pamwamba pa kuwotcherera;solder phala kusungunuka, reflow ndi solder phala kuzirala, ndi kulimba.Mphepete mwa kutentha kwanthawi zonse (Mbiri: imatanthawuza kupindika komwe kutentha kwa solder pa PCB kumasintha ndi nthawi yomwe ikudutsa mung'anjo ya reflow) imagawidwa m'malo otentha, malo osungira kutentha, malo obwereranso, ndi malo ozizira.(onani pamwambapa)

① Dera lotenthetsera: Cholinga cha malo otenthetsera ndikutenthetsa PCB ndi zigawo zake, kukwaniritsa bwino, ndikuchotsa madzi ndi zosungunulira mu solder phala, kuti mupewe kugwa kwa solder phala ndi solder spatter.Kutentha kwa kutentha kumayendetsedwa mosiyanasiyana (mwachangu kwambiri kumapangitsa kutenthedwa kwa kutentha, monga kusweka kwa multilayer ceramic capacitor, kuwaza kwa solder, kupanga mipira ya solder ndi zolumikizira zogulitsira popanda solder osakwanira m'dera lomwe silinatsekerezedwe la PCB yonse. ; pang'onopang'ono kufooketsa ntchito ya flux).Nthawi zambiri, pazipita kutentha kukwera mlingo ndi 4 ℃ / mphindi, ndi kukwera mlingo waikidwa monga 1-3 ℃ / sec, umene ndi muyezo wa ECs Ndi zosakwana 3 ℃ / sec.

② Zone yosungira kutentha (yogwira): imatanthawuza chigawo kuyambira 120 ℃ mpaka 160 ℃.Cholinga chachikulu ndikupangitsa kutentha kwa gawo lililonse pa PCB kukhala yunifolomu, kuchepetsa kusiyana kwa kutentha momwe mungathere, ndikuonetsetsa kuti solder ikhoza kuuma kwathunthu isanafike kutentha kwa reflow.Pamapeto pa malo otsekemera, oxide pa solder pad, solder phala mpira, ndi chigawo pini adzachotsedwa, ndipo kutentha kwa gulu lonse dera adzakhala bwino.Nthawi yokonza ndi pafupi masekondi 60-120, kutengera mtundu wa solder.ECS muyezo: 140-170 ℃, max120sec;

③ Reflow zone: kutentha kwa chotenthetsera m'derali kumayikidwa pamlingo wapamwamba kwambiri.Kutentha kwakukulu kwa kuwotcherera kumadalira phala la solder lomwe limagwiritsidwa ntchito.Nthawi zambiri tikulimbikitsidwa kuwonjezera 20-40 ℃ ku kutentha kwa malo osungunuka a solder phala.Panthawi imeneyi, solder mu solder phala akuyamba kusungunuka ndi kuyenda kachiwiri, m'malo madzi flux kunyowetsa PAD ndi zigawo zikuluzikulu.Nthawi zina, derali limagawidwanso zigawo ziwiri: chigawo chosungunuka ndi dera la reflow.Kutentha kwabwino kumapindikira ndikuti malo omwe ali ndi "nsonga" kupitirira malo osungunuka a solder ndi ochepa kwambiri komanso osakanikirana, nthawi zambiri, nthawi ya 200 ℃ ndi 30-40 sec.Muyezo wa ECS ndi kutentha kwakukulu: 210-220 ℃, nthawi yosiyana ndi 200 ℃: 40 ± 3sec;

④ Malo ozizira: kuziziritsa mwachangu momwe kungathekere kumathandizira kupeza malo olumikizirana owala okhala ndi mawonekedwe athunthu komanso ngodya yocheperako.Kuziziritsa pang'onopang'ono kumapangitsa kuti pad iwonongeke kwambiri mu malata, zomwe zimapangitsa kuti mafupa azikhala otuwa komanso owuma, komanso kupangitsa kuti malata asokonezeke komanso kumamatira kwa ma solder ofooka.Kuzizira nthawi zambiri kumakhala mkati mwa - 4 ℃ / sec, ndipo kumatha kukhazikika mpaka pafupifupi 75 ℃.Nthawi zambiri, kuziziritsa mokakamizidwa ndi fan fan ndikofunikira.

3. Zinthu zosiyanasiyana zimakhudza ntchito kuwotcherera

Zinthu zamakono

Kuwotcherera pretreatment njira, mtundu mankhwala, njira, makulidwe, chiwerengero cha zigawo.Kaya yatenthedwa, yodulidwa kapena yokonzedwa mwanjira zina panthawi yochokera kuchipatala kupita ku kuwotcherera.

Mapangidwe a njira yowotcherera

Kuwotcherera m'dera: amatanthauza kukula, kusiyana, kusiyana kalozera lamba (ma waya): mawonekedwe, matenthedwe madutsidwe, kutentha mphamvu ya welded chinthu: amatanthauza kuwotcherera malangizo, udindo, kuthamanga, kugwirizana boma, etc.

Kuwotcherera zinthu

Zimatanthawuza kutentha ndi nthawi yowotcherera, kutentha, kutentha, kuthamanga kwa kutentha, kutentha kwa kutentha, mawonekedwe onyamula kutentha (wavelength, kuthamanga kwa conduction, etc.)

kuwotcherera zinthu

Flux: kapangidwe, ndende, zochita, malo osungunuka, malo otentha, etc

Solder: kapangidwe, kapangidwe, zonyansa, malo osungunuka, etc

Base zitsulo: kapangidwe, kapangidwe ndi matenthedwe madutsidwe zitsulo m'munsi

Viscosity, mphamvu yokoka komanso thixotropic katundu wa solder phala

Gawo lapansi zinthu, mtundu, cladding zitsulo, etc.

Nkhani ndi zithunzi zochokera pa intaneti, ngati kuphwanya kulikonse pls lemberani kuti tifufute.
NeoDen imapereka mayankho athunthu a mzere wa SMT, kuphatikiza uvuni wa SMT reflow, makina osokera, makina osankha ndi malo, makina osindikizira a solder, PCB loader, PCB unloader, chip mounter, SMT AOI makina, makina a SMT SPI, makina a SMT X-Ray, Zida zopangira msonkhano wa SMT, Zida zopangira PCB SMT zida zosinthira, ndi zina zilizonse makina a SMT omwe mungafune, chonde titumizireni kuti mumve zambiri:

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