(1) Nheyo yereflow soldering
Nekuda kwekuenderera mberi miniaturization yemagetsi chigadzirwa PCB mabhodhi, chip zvikamu zvakaonekwa, uye echinyakare welding nzira dzatadza kuzadzisa zvinodiwa.Reflow soldering inoshandiswa mukusangana kwemahybrid akasanganiswa edunhu mabhodhi, uye mazhinji ezvikamu zvakaunganidzwa uye zvakashongedzwa chip capacitors, chip inductors, mounted transistors uye diode.Nekuvandudzwa kweiyo yese SMT tekinoroji ichiwedzera uye yakanyanya kukwana, kubuda kweakasiyana siyana chip components (SMC) uye mounting midziyo (SMD), reflow soldering process tekinoroji nemidziyo sechikamu cheiyo inokwirisa tekinoroji yakagadziridzwawo saizvozvo. , uye kunyorera kwavo kuri kuramba kuchiwedzera.Yakaiswa mune dzinenge dzese zvigadzirwa zvemagetsi minda.Reflow soldering solder yakapfava inoziva kubatanidzwa kwemagetsi nemagetsi pakati peanotengeswa epamhepo akaiswa zvinhu kana mapini nemapedhi ebhodhi akadhindwa nekudzoreredza solder-yakaiswa paste inofanogoverwa pamapepa ebhodhi akadhindwa.weld.Reflow soldering ndeyekutengesa zvinhu kuPCB board, uye reflow soldering ndeyekuisa zvishandiso pamusoro.Reflow soldering inovimba nekuita kwekuyerera kwemhepo inopisa pamajoini ekutengesa, uye iyo jelly-senge flux inosangana nekuita kwemuviri pasi peimwe tembiricha yepamusoro yekuyerera kwemhepo kuti uwane SMD solder;saka inodaidzwa kuti "reflow soldering" nekuti gasi rinotenderera mumushini we welding kuti ibudise tembiricha yakanyanya kuzadzisa chinangwa chekutengesa..
(2) Nheyo yereflow solderingmuchina wakakamurwa mune dzakawanda tsananguro:
A. Kana PCB ichipinda munzvimbo yekudziya, iyo inonyungudutsa uye gasi mune solder paste inoputika.Panguva imwecheteyo, iyo inoyerera mu solder paste inonyorovesa mapedhi, zvikamu zviteshi nemapini, uye solder paste inopfava, inodonha, uye inovhara solder paste.ndiro yekuparadzanisa mapedhi uye mapini echikamu kubva kuokisijeni.
B. Kana PCB ichipinda munzvimbo yekuchengetedza kupisa, PCB uye zvikamu zvinopisa zvakakwana kudzivirira PCB kubva pakarepo ichipinda munzvimbo yekushisa yepamusoro yewelding uye kukuvadza PCB uye zvikamu.
C. Kana PCB ichipinda munzvimbo yewelding, tembiricha inokwira nekukurumidza zvekuti solder paste inosvika payakanyungudutswa, uye mvura solder inonyorova, inopararira, inoparadzira, kana kufambisazve mapedhi, chikamu chinoguma uye mapini ePCB kuita majoini ekutengesa. .
D. Iyo PCB inopinda munzvimbo yekutonhora kuti isimbise majoini ekutengesa;kana reflow soldering yapera.
(3) Process zvinodiwa kutireflow solderingmuchina
Reflow soldering tekinoroji haina kujaira mumunda wekugadzira zvemagetsi.Zvikamu pamapuranga akasiyana-siyana anoshandiswa mumakomputa edu anotengeswa kumabhodhi edunhu kuburikidza nekuita uku.Zvakanakira izvi ndezvekuti tembiricha iri nyore kudzora, oxidation inogona kudziviswa panguva yekushambadzira, uye mutengo wekugadzira uri nyore kudzora.Pane inodziya dunhu mukati memudziyo uyu, iyo inopisa nitrogen gasi kusvika pakakwirira zvakakwana tembiricha uye inoifuridza kune redunhu bhodhi uko zvikamu zvakasungirirwa, kuitira kuti solder pamativi ese ezvikamu inonyungudutswa uye yobva yasungirirwa kubhodhi reamai. .
1. Seta inonzwisisika reflow soldering tembiricha mbiri uye ita chaiyo-nguva yekuyedza yetembiricha profiles nguva nenguva.
2. Weld maererano neyakagadzirirwa kutungamira kwePCB dhizaini.
3. Dzivirira zvakasimba bhandi rekutakura kubva pakudengenyeka panguva yekugadzira.
4. Mhedzisiro yewelding yebhodhi rakadhindwa inofanira kuongororwa.
5. Kana kuputika kwakakwana, kana nzvimbo yejojo ye solder yakatsetseka, kana chimiro chejojo ye solder ihafu-mwedzi, mamiriro ekutengesa mabhora uye zvakasara, mamiriro ekuenderera mberi kwekugadzirisa uye virtual welding.Uyezve tarisa PCB pamusoro peruvara shanduko uye zvichingodaro.Uye gadzirisa tembiricha curve zvinoenderana nemhedzisiro yekuongorora.Welding mhando inofanirwa kutariswa nguva nenguva panguva yese yekugadzira.
(4) Zvinhu zvinokanganisa maitiro ekudzoreredza:
1. Kazhinji PLCC neQFP dzine simba guru rekupisa kupfuura discrete chip components, uye zvakanyanya kuoma kupinza zvikamu zvakakura-nzvimbo pane zviduku zviduku.
2. Muhovhoni yekuyerera, bhandi rekutakura rinovawo hurongwa hwekupisa kupisa kana zvigadzirwa zvinofambiswa zvichidzokororwa kakawanda.Mukuwedzera, mamiriro ekupisa kupisa pamucheto uye pakati pechikamu chekupisa zvakasiyana, uye kutonhora kumucheto kwakaderera.Mukuwedzera kune zvakasiyana-siyana zvinodiwa, kutonhora kwenzvimbo imwechete yekutakura kwakasiyanawo.
3. Pesvedzero yezvakasiyana zvigadzirwa loadings.Iko kugadziridzwa kweiyo tembiricha mbiri ye reflow soldering kunofanirwa kufunga kuti yakanaka kudzokorora inogona kuwanikwa pasi pe-isina-mutoro, mutoro uye akasiyana mitoro zvinhu.Chinhu chinotakura chinotsanangurwa se: LF = L / (L + S);uko L=kureba kwechikamu chakaunganidzwa uye S=kupanana kwechikamu chakaunganidzwa.Iyo yakakwirira iyo inotakura chinhu, iyo yakanyanya kuoma kuwana reproducible mhedzisiro yeiyo reflow process.Kazhinji iyo yakanyanya kuremerwa chinhu cheiyo reflow oven iri muhuwandu hwe0.5 ~ 0.9.Izvi zvinoenderana nemamiriro ezvinhu echigadzirwa (chikamu chesoldering density, akasiyana substrates) uye akasiyana mamodheru efurnaces.Chiitiko chinoshanda chakakosha kuti uwane yakanaka welding mhedzisiro uye kudzokorora.
(5) Ndezvipi zvakanakirareflow solderingtekinoroji yemuchina?
1) Paunenge uchitengesa nereflow soldering tekinoroji, hapana chikonzero chekunyudza yakadhindwa redunhu bhodhi mune yakanyungudutswa solder, asi kupisa kwenzvimbo kunoshandiswa kupedzisa basa rekutengesa;saka, zvikamu zvinotengeswa zvinotarisana nekuvhunduka kuduku uye hazvizokonzerwi nekupisa kwekukuvadza kune zvikamu.
2) Sezvo tekinoroji yewelding ichingoda kuisa solder pane welding chikamu uye ichipisa munzvimbo kuti ipedze kukwenenzvera, urema hwewelding senge bhiriji hunodziviswa.
3) Mune reflow soldering process teknolojia, solder inoshandiswa kamwe chete, uye hapana kushandiswa zvakare, saka solder yakachena uye isina tsvina, iyo inovimbisa kunaka kwezvibatanidzwa zve solder.
(6) Nhanganyaya kune nzira yekuyerera kwereflow solderingmuchina
Iyo reflow soldering process inzvimbo yekumisikidza bhodhi, uye maitiro ayo akanyanya kuomarara, ayo anogona kukamurwa kuva marudzi maviri: single-sided mounting uye kaviri-sided mounting.
A, kusungirirwa kwedivi rimwe chete: pre-coating solder paste → chigamba (chakakamurwa kuita manual mounting uye muchina otomatiki mounting) → reflow soldering → kuongorora uye kuyedza magetsi.
B, Kusungirirwa kwamativi maviri: Pre-coating solder paste paA side → SMT (yakakamurwa kuita manual placement and automatic machine placement) → Reflow soldering → Pre-coating solder paste paB side → SMD (yakakamurwa kuita manual place and machine automatic placement ) kuiswa) → reflow soldering → kuongorora uye kuongorora magetsi.
Iyo yakapfava nzira yereflow soldering ndeye "screen printing solder paste - patch - reflow soldering, iyo musimboti iko iko kurongeka kwekudhinda sirika skrini, uye chiyero chegoho chinotarwa nePPM yemuchina wepatch soldering, uye reflow soldering ndeye. kudzora kukwira kwekushisa uye kupisa kwakanyanya.uye kudzikira kwe tembiricha.”
(7) Reflow soldering muchina gadziriro yekugadzirisa
Basa rekuchengetedza ratinofanira kuita mushure mekushandisa reflow soldering;kana zvisina kudaro, zvakaoma kuchengetedza hupenyu hwebasa remidziyo.
1. Chikamu chimwe nechimwe chinofanira kuongororwa zuva nezuva, uye kunyatsotarisirwa kunofanira kubhadharwa kune bhanhire rinotakura, kuitira kuti rirege kunamatira kana kudonha.
2 Paunenge uchigadzirisa muchina, magetsi anofanirwa kudzimwa kudzivirira kuvhunduka kwemagetsi kana kupfupika.
3. Muchina unofanirwa kuve wakagadzikana uye usina kurerekera kana kusagadzikana
4. Panyaya yenzvimbo dzetembiricha dzega dzega dzinomira kudziyisa, tanga watarisa kuti fuse inoenderana yakagoverwa kuPCB padhi nekunyungudutsa paste.
(8) Chengetedzo ye reflow soldering muchina
1. Kuti ave nechokwadi chekuchengetedzwa kwemunhu, mufambisi anofanira kubvisa zvinyorwa uye zvishongo, uye sleeve haifaniri kunge yakasununguka.
2 Chengetedza tembiricha yakanyanya panguva yekushanda kudzivirira scald kugadzirisa
3. Usaite zvekuda kuseta tembiricha zone uye kumhanya kwereflow soldering
4. Ita shuwa kuti imba yacho ine mhepo, uye muto unobvisa utsi unofanira kutungamirira kunze kwehwindo.
Nguva yekutumira: Sep-07-2022