(1) Mfundo yareflow soldering
Chifukwa cha miniaturization mosalekeza wa zipangizo zamagetsi PCB matabwa, zida chip zaonekera, ndi njira kuwotcherera miyambo sizinathe kukwaniritsa zosowa.Reflow soldering imagwiritsidwa ntchito pophatikizira ma board ophatikizika a haibridi, ndipo zigawo zambiri zomwe zimasonkhanitsidwa ndikuwotcherera ndi chip capacitors, chip inductors, ma transistors okwera ndi ma diode.Ndi chitukuko cha teknoloji yonse ya SMT kukhala yabwino kwambiri, kutuluka kwa zipangizo zosiyanasiyana za chip (SMC) ndi zipangizo zoyikirapo (SMD), ukadaulo wa reflow soldering process ndi zida monga gawo laukadaulo wokweza zidapangidwanso moyenerera. , ndipo ntchito zawo zikuchulukirachulukira.Zakhala zikugwiritsidwa ntchito pafupifupi m'minda yonse yamagetsi.Reflow soldering ndi solder yofewa yomwe imazindikira kugwirizana kwa makina ndi magetsi pakati pa mapeto a solder a zigawo zokwera pamwamba kapena zikhomo ndi mapepala osindikizira a bolodi mwa kubwezeretsanso solder yodzaza phala yomwe imagawidwa kale pamapepala osindikizidwa.weld.Reflow soldering ndikuyika zida zogulitsira ku bolodi la PCB, ndipo kutulutsanso ndikuyika zida pamtunda.Reflow soldering imadalira machitidwe a mpweya wotentha pamalumikizidwe a solder, ndipo kutulutsa kofanana ndi odzola kumayendera thupi pansi pa kutentha kwina kwa mpweya kuti mukwaniritse SMD soldering;kotero imatchedwa "reflow soldering" chifukwa mpweya umazungulira mu makina owotcherera kuti apange kutentha kwakukulu kuti akwaniritse cholinga cha soldering..
(2) Mfundo yareflow solderingmakina amagawidwa m'mafotokozedwe angapo:
A. Pamene PCB akulowa Kutentha zone, zosungunulira ndi mpweya mu solder phala nthunzi nthunzi.Panthawi imodzimodziyo, kutuluka kwa phala la solder kumanyowetsa mapepala, zigawo ndi mapini, ndipo phala la solder limafewetsa, kugwa, ndikuphimba phala la solder.mbale kuti azipatula mapepala ndi zikhomo za oxygen.
B. Pamene PCB alowa m'dera kuteteza kutentha, ndi PCB ndi zigawo zonse preheated kuteteza PCB mwadzidzidzi kulowa mkulu kutentha m'dera kuwotcherera ndi kuwononga PCB ndi zigawo zikuluzikulu.
C. Pamene PCB alowa m'dera kuwotcherera, kutentha limatuluka mofulumira kuti solder phala kufika kusungunuka, ndi madzi solder amanyowetsa, diffuses, diffuses, kapena reflows ziyangoyango, chigawo malekezero ndi zikhomo za PCB kupanga solder olowa. .
D. The PCB akulowa m'dera kuzirala kulimbitsa olowa solder;pamene reflow soldering yatha.
(3) Zofunikira za ndondomeko yareflow solderingmakina
Ukadaulo wa Reflow soldering siwodziwika bwino pantchito yopanga zamagetsi.Zigawo zamagulu osiyanasiyana omwe amagwiritsidwa ntchito m'makompyuta athu amagulitsidwa ku ma board board kudzera munjira iyi.Ubwino wa njirayi ndikuti kutentha kumakhala kosavuta kuwongolera, oxidation imatha kupewedwa panthawi ya soldering, ndipo mtengo wopanga ndi wosavuta kuwongolera.Pali magetsi otenthetsera mkati mwa chipangizochi, chomwe chimatenthetsa mpweya wa nayitrogeni mpaka kutentha kokwanira ndikuwuwombera ku bolodi lozungulira komwe zigawo zake zalumikizidwa, kotero kuti solder mbali zonse ziwiri za zigawozo zimasungunuka ndikumangirira ku bolodi. .
1. Khazikitsani mbiri ya kutentha kwa reflow soldering ndikuyesa zenizeni zenizeni nthawi zonse.
2. Weld molingana ndi kuwotcherera malangizo a PCB kapangidwe.
3. Onetsetsani kuti lamba wonyamula katundu asagwedezeke panthawi yowotcherera.
4. Mphamvu yowotcherera ya bolodi yosindikizidwa iyenera kufufuzidwa.
5. Kaya kuwotcherera ndi kokwanira, kaya pamwamba pa solder olowa ndi yosalala, ngati mawonekedwe a solder olowa ndi theka la mwezi, mkhalidwe wa solder mipira ndi zotsalira, mkhalidwe wa kuwotcherera mosalekeza ndi kuwotcherera pafupifupi.Onaninso kusintha kwa mtundu wa PCB pamwamba ndi zina zotero.Ndipo sinthani kutentha kwa kutentha malinga ndi zotsatira zoyendera.Ubwino wa kuwotcherera uyenera kuyang'aniridwa pafupipafupi panthawi yonse yopanga.
(4) Zinthu zomwe zimakhudza njira yobwezeretsanso:
1. Kawirikawiri PLCC ndi QFP zimakhala ndi kutentha kwakukulu kuposa zigawo za chip chip, ndipo zimakhala zovuta kuwotcherera zigawo zazikuluzikulu kusiyana ndi zing'onozing'ono.
2. Mu ng'anjo yowonjezereka, lamba wotumizira amakhalanso njira yochepetsera kutentha pamene zinthu zotumizidwa zimatumizidwa mobwerezabwereza.Kuonjezera apo, kutentha kwa kutentha pamphepete ndi pakati pa gawo la kutentha kumakhala kosiyana, ndipo kutentha pamphepete kumakhala kochepa.Kuphatikiza pa zofunikira zosiyanasiyana, kutentha kwa malo omwewo amatsitsanso kumakhala kosiyana.
3. Mphamvu ya katundu osiyanasiyana katundu.Kusintha kwa kutentha kwa kutentha kwa reflow soldering kuyenera kuganiziridwa kuti kubwereza kwabwino kumatha kupezeka popanda katundu, katundu ndi zinthu zosiyanasiyana zolemetsa.Chinthu cholemetsa chimatanthauzidwa ngati: LF = L / (L + S);kumene L=utali wa gawo lapansi losonkhanitsidwa ndi S=kutalikirana kwa gawo lapansi losonkhanitsidwa.Kukwera kwa katundu wolemetsa, kumakhala kovuta kwambiri kupeza zotsatira zobwerezabwereza za ndondomeko yobwezeretsanso.Nthawi zambiri katundu wochuluka wa uvuni wobwereranso amakhala mumtundu wa 0.5 ~ 0.9.Izi zimatengera momwe zinthu ziliri (kachulukidwe kagawo ka soldering, magawo osiyanasiyana) ndi mitundu yosiyanasiyana ya ng'anjo za reflow.Zochitika zothandiza ndizofunikira kuti mupeze zotsatira zabwino zowotcherera komanso kubwerezabwereza.
(5) Ubwino wake ndi wotanireflow solderingmakina luso?
1) Pamene soldering ndi reflow soldering teknoloji, palibe chifukwa chomiza bolodi losindikizidwa mu solder yosungunuka, koma kutentha kwa m'deralo kumagwiritsidwa ntchito kuti amalize ntchitoyo;Choncho, zigawo zikuluzikulu kuti soldered ndi pansi mantha pang'ono matenthedwe ndipo sizidzayamba chifukwa kutenthedwa kuwonongeka kwa zigawo zikuluzikulu.
2) Popeza ukadaulo wowotcherera umangofunika kuyika solder pa gawo lowotcherera ndikuwotcha komweko kuti amalize kuwotcherera, zolakwika zowotcherera monga kutsekereza zimapewedwa.
3) Mu tekinoloje ya reflow soldering process, solder imagwiritsidwa ntchito kamodzi kokha, ndipo palibe kugwiritsiridwa ntchito, kotero kuti solder ndi yoyera komanso yopanda zonyansa, zomwe zimatsimikizira ubwino wa zida za solder.
(6) Chiyambi cha njira otayareflow solderingmakina
Njira yopangira reflow soldering ndi bolodi lokwera pamwamba, ndipo ndondomeko yake ndi yovuta kwambiri, yomwe ingagawidwe m'mitundu iwiri: kukwera kwa mbali imodzi ndi kuyikapo mbali ziwiri.
A, kuyika mbali imodzi: phala lophikirapo → chigamba (chogawika m'mawu oyika pamanja ndi makina owukira okha) → kusungunulanso → kuyendera ndi kuyesa magetsi.
B, Kuyikapo mbali ziwiri: Phala lophikirapo pa A mbali → SMT (yogawika m'mayikidwe amanja ndi makina opangira makina) → Kuwotcheranso → phala la solder loyikapo mbali B → SMD (yogawika m'mayikidwe amanja ndikuyika makina okha ) kuyika) → kubwezeretsanso → kuyendera ndi kuyesa magetsi.
Njira yosavuta ya reflow soldering ndi "screen printing solder phala - chigamba - reflow soldering, phata lake ndi kulondola kwa silika chophimba kusindikiza, ndipo mlingo zokolola zimatsimikiziridwa ndi PPM ya makina kwa chigamba soldering, ndi reflow soldering ndi. kuwongolera kukwera kwa kutentha ndi kutentha kwakukulu.ndi kuchepa kwa kutentha kopindika.”
(7) Reflow soldering makina makina kukonza dongosolo
Ntchito yokonza yomwe tiyenera kuchita pambuyo pa kugwiritsidwa ntchito kwa reflow soldering;mwinamwake, n'zovuta kusunga moyo wautumiki wa zipangizo.
1. Chigawo chilichonse chiyenera kuyang'aniridwa tsiku ndi tsiku, ndipo chisamaliro chapadera chiyenera kuperekedwa kwa lamba wotumizira, kuti asamangidwe kapena kugwa.
2 Mukakonza makinawo, magetsi azimitsidwa kuti apewe kugwedezeka kwamagetsi kapena kufupika.
3. Makinawa ayenera kukhala okhazikika komanso osapendekeka kapena osakhazikika
4. Pankhani ya kutentha komwe kumasiya kutentha, choyamba onetsetsani kuti fusesi yofananirayo idagawidwa kale ku PCB pad pokonzanso phala.
(8) Njira zodzitetezera pamakina a reflow soldering
1. Kuti atsimikizire chitetezo chaumwini, wogwira ntchitoyo ayenera kuvula chizindikiro ndi zokongoletsera, ndipo manja asakhale omasuka kwambiri.
2 Samalani kutentha kwambiri panthawi ya ntchito kuti mupewe kukonza scald
3. Osamangoyika malo otentha ndi liwiro lareflow soldering
4. Onetsetsani kuti chipindacho chili ndi mpweya wabwino, ndipo chotulutsa utsi chizitsogolera kunja kwa zenera.
Nthawi yotumiza: Sep-07-2022