Mfundo ziwiri zowongolerera liwiro la mphepo kwa uvuni wa reflow

Kuti muzindikire kuwongolera kwa liwiro la mphepo ndi kuchuluka kwa mpweya, mfundo ziwiri ziyenera kutsatiridwa:

1. Kuthamanga kwa fani kuyenera kuwongoleredwa ndi kutembenuka pafupipafupi kuti muchepetse kusinthasintha kwamagetsi pa iyo;
2. Chepetsani mpweya wotulutsa mpweya wa zida, chifukwa katundu wapakati wa mpweya wotulutsa mpweya nthawi zambiri amakhala wosasunthika, womwe umakhudza mosavuta kutuluka kwa mpweya wotentha mu ng'anjo.
3. Kukhazikika kwa zida

Nthawi yomweyo tapeza mawonekedwe abwino kwambiri a kutentha kwa ng'anjo, koma kuti tikwaniritse, kukhazikika, kubwerezabwereza komanso kusasinthasintha kwa zida zimafunikira kuti zitsimikizire.Makamaka pakupanga kopanda kutsogolera, ngati ng'anjo yotentha ya ng'anjo imayenda pang'onopang'ono chifukwa cha zifukwa za zida, ndizosavuta kudumpha kuchokera pawindo la ndondomeko ndikuyambitsa kuzizira kapena kuwonongeka kwa chipangizo choyambirira.Chifukwa chake, opanga ochulukirachulukira akuyamba kuyika patsogolo zoyeserera zokhazikika pazida.

l Kugwiritsa ntchito nayitrogeni

Kubwera kwa nthawi yopanda kutsogolera, kaya reflow soldering yodzazidwa ndi nayitrogeni yakhala nkhani yotentha kwambiri.Chifukwa cha fluidity, solderability, ndi wettability wa ma solders opanda kutsogolera, iwo sali abwino ngati otsogolera otsogolera, makamaka pamene mapepala a board board atengera ndondomeko ya OSP (organic protective film bare copper board), mapepala ndi osavuta oxidize, Nthawi zambiri zimabweretsa zolumikizira zolumikizira Ngodya yonyowa ndi yayikulu kwambiri ndipo padiyo imawonekera mkuwa.Kuti tiwongolere maulalo a solder, nthawi zina timafunika kugwiritsa ntchito nayitrogeni panthawi ya reflow soldering.Nayitrojeni ndi mpweya wotchinga wotchinga, womwe umatha kuteteza ma boardboard kuti asatenthedwe ndi makutidwe ndi okosijeni panthawi ya soldering, ndikuwongolera kwambiri kugulitsidwa kwa ogulitsa opanda lead (Chithunzi 5).

Chithunzi 5 Kuwotcherera kwa chishango chachitsulo pansi pa malo odzaza nayitrogeni

Ngakhale kuti opanga zinthu zambiri zamagetsi sagwiritsa ntchito nayitrogeni kwakanthawi chifukwa choganizira za mtengo wogwirira ntchito, ndikuwongolera mosalekeza kwa zofunikira zamtundu wa lead-free soldering, kugwiritsa ntchito nayitrogeni kumakhala kofala kwambiri.Choncho, chisankho chabwino ndi chakuti ngakhale kuti nayitrogeni sagwiritsidwa ntchito kwenikweni pakupanga kwenikweni pakali pano, ndi bwino kusiya zipangizozo ndi mawonekedwe odzaza nayitrogeni kuti zitsimikizire kuti zidazo zimakhala ndi zosinthika kuti zikwaniritse zofunikira za kudzaza kwa nayitrogeni m'tsogolomu.

l Chida choziziritsa chogwira bwino komanso kasamalidwe ka flux

Kutentha kwa soldering kwa kupanga kopanda kutsogolera kumakhala kwakukulu kwambiri kuposa kutsogolo, komwe kumapereka zofunika kwambiri pa ntchito yozizira ya zipangizo.Komanso, controllable mofulumira kuzirala kungachititse kuti kutsogolera wopanda solder olowa dongosolo yaying'ono, zomwe zimathandiza kupititsa patsogolo mawotchi mphamvu ya solder olowa.Makamaka tikapanga matabwa ozungulira okhala ndi kutentha kwakukulu monga ma backplanes olankhulana, ngati tingogwiritsa ntchito kuziziritsa mpweya, zimakhala zovuta kuti matabwa ozungulira akwaniritse zofunikira zoziziritsa za madigiri 3-5 pa sekondi imodzi panthawi yozizira, ndipo malo otsetsereka sangathe. kufikira Chofunikiracho chidzamasula kapangidwe ka solder ndikukhudza mwachindunji kudalirika kwa mgwirizano wa solder.Chifukwa chake, kupanga kopanda lead kumalimbikitsidwa kwambiri kuti aganizire kugwiritsa ntchito zida zoziziritsira madzi zozungulira kawiri, ndipo malo ozizirirapo a zida ayenera kukhazikitsidwa momwe amafunikira ndikuwongolera bwino.

Mtsogoleri wopanda solder phala nthawi zambiri amakhala ndi kuchulukirachulukira, ndi zotsalira flux zosavuta kudziunjikira mkati ng'anjo, zomwe zimakhudza kutentha kutengerapo ntchito ya zipangizo, ndipo nthawi zina ngakhale kugwa pa bolodi dera mu ng'anjo kuchititsa kuipitsa.Pali njira ziwiri zochotsera zotsalira za flux panthawi yopanga;

(1) Kutulutsa mpweya

Mpweya wotopetsa ndiyo njira yosavuta yochotsera zotsalira za flux.Komabe, tanena m'nkhani yapitayi kuti mpweya wotulutsa mpweya wambiri udzakhudza kukhazikika kwa mpweya wotentha mu ng'anjo yamoto.Kuonjezera apo, kuonjezera kuchuluka kwa mpweya wotulutsa mpweya kudzatsogolera mwachindunji kuwonjezeka kwa mphamvu zamagetsi (kuphatikizapo magetsi ndi nayitrogeni).

(2) Njira yoyendetsera maulendo angapo

Dongosolo la kayendetsedwe ka flux nthawi zambiri limaphatikizapo chipangizo chosefera ndi chipangizo cholumikizira (Chithunzi 6 ndi Chithunzi 7).The kusefa chipangizo bwino amalekanitsa ndi Zosefera olimba particles mu zotsalira flux, pamene kuzirala chipangizo condenses ndi mpweya kutuluka zotsalira mu madzi mu kutentha exchanger, ndipo potsiriza asonkhanitsa izo mu thireyi kusonkhanitsa kwa processing centralized.

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Chithunzi 6 Kusefa chipangizo mu kayendedwe ka kayendedwe ka flux

Chithunzi 7 Chipangizo chowongolera mumayendedwe owongolera