Kana mabhora ekutengesa akaonekwa, anogona kukanganisa kushanda kwese kwedunhuboard.Mabhora madiki ekutengesa haataridzike uye anogona kufambisa zvikamu zvishoma kubva pachiratidzo.Mumamiriro ezvinhu akaipisisa, mabhora makuru ekutengesa anogona kudonha kubva pamusoro uye kuderedza kunaka kwezvikamu zvezvikamu.Zvakatonyanya kuipa, mamwe mabhora anogona kukungurukapane zvimwe zvikamu zvebhodhi, zvinotungamirira kune zvikabudura nekutsva.
Zvikonzero zvishoma nei solder mabhora akaitika zvinosanganisira:
Excess humidity munzvimbo yekuvaka
Kunyorova kana kunyorova paPCB
Yakawandisa flux mu solder paste
Tembiricha kana kudzvanywa kwakanyanyisa panguva yekudzokorora
Kusakwana kupukuta uye kuchenesa post-reflow
Solder paste haina kugadzirwa zvakakwana
Nzira dzekudzivirira Solder Balls
Nezvinokonzera mabhora ekutengesa mupfungwa, unogona kushandisa nzira dzakasiyana-siyana uye zviyero panguva yekugadzira nzira yekudzivirira.Mamwe matanho anoshanda ndeaya:
1. Deredza PCB Unyoro
Iyo PCB base zvinhu inogona kuchengetedza mwando kana iwe waiisa mukugadzira.Kana bhodhi rakanyorova paunotanga kushandisa solder, solder mabhora angangoitika.Nekuona kuti bhodhi haina unyoro sezvinogoneka, mugadziri anogona kudzivirira kuti zvirege kuitika.
Chengetedza ese maPCB munzvimbo yakaoma, pasina chero nzvimbo dziri pedyo dzehunyoro.Usati wagadzirwa, tarisa pane imwe neimwe bhodhi kuti uone zviratidzo zvekunyorova, wobva wapukuta nemachira e-anti-static.Yeuka kuti hunyoro hunogona kusungirirwa mumapadhi e solder.Kubika mabhodhi pa120 madhigirii celsius kwemaawa mana kutenderera kwega kwega kwekugadzira kunoburitsa chero hunyoro hwakawandisa.
2. Sarudza Yakarurama Solder Paste
Zvinhu zvinoshandiswa kugadzira solder zvinogonawo kugadzira mabhora ekutengesa.Yakakwira simbi yemukati uye yakaderera oxidation mukati mepaste inoderedza mikana yekuti mabhora aumbe, sezvo viscosity yemutengesi inodzivirira.kubva pakudonha uchipisa.
Iwe unogona kushandisa flux kubatsira kudzivirira oxidation uye kurerutsa kucheneswa kwemabhodhi mushure mekutengesa, asi yakawandisa inotungamira mukudonha kwechimiro.Sarudza solder paste inosangana nezvinodiwa kuti bhodhi rigadzirwe, uye mikana yekugadzira mabhora ekutengesa inodonha zvakanyanya.
3. Preheat PCB
Sezvo iyo reflow system inotanga, tembiricha yepamusoro inogona kukonzera kunyungudika kusati kwasvika uye kubudaye solder nenzira yekuti iite kuti ipupure uye bhora.Izvi zvinokonzerwa nemusiyano wakakura pakati pezvinhu zvebhodhi nehovheni.
Kuti udzivise izvi, preheat mapuranga kuitira kuti ave pedyo nekupisa kwevheni.Izvi zvinoderedza dhigirii rekuchinja kana kupisa kwatanga mukati, zvichibvumira solder kunyunguduka zvakaenzana pasina kupisa.
4. Usapotsa Solder Mask
Solder masks itete rakatsetseka repolymer rinoiswa kune dunhu remhangura traces, uye solder mabhora anogona kuumba pasina iwo.Ita shuwa kuti unoshandisa nemazvo solder paste kudzivirira mikaha pakati pematanho nemapads, uye tarisa kuti solder mask iri panzvimbo.
Iwe unogona kuvandudza hurongwa uhu nekushandisa midziyo yemhando yepamusoro uye zvakare nekudzikamisa chiyero icho mabhodhi anopisa.Iyo inononoka preheat rate inobvumira solder kupararira zvakaenzana pasina kusiya nzvimbo dzekuti mabhora aumbe.
5. Deredza PCB Mounting Stress
Stress inoiswa pabhodhi kana yaiswa inogona kutambanudza kana kudzikamisa maronda nemapads.Kunyanya kudzvinyirirwa mukati uye mapadhi achasundirwa akavharwa;kunyanya kushushikana kwekunze uye ivo vanozodhonzwa pachena.
Kana dzanyanya kuvhurika, solder ichasundirwa kunze, uye hapazove yakakwana mairi kana yakavharwa.Ita shuwa kuti bhodhi haisi kutambanudzwa kana kupwanywa isati yagadzirwa, uye iyi isiriyo chiyero che solder hachizokwira kumusoro.
6. Kaviri Tarisa Pad Spacing
Kana mapedhi ari pabhodhi ari munzvimbo dzisina kunaka kana padyo zvakanyanya kana kure kure, izvi zvinogona kutungamirira kune solder pooling zvisizvo.Kana mabhora ekutengesa achiita fomu kana mapedhi asina kuiswa zvisina kunaka, izvi zvinowedzera mukana wekuti achadonha uye anokonzera shorts.
Ita shuwa kuti zvirongwa zvese zvine mapadhi akaiswa panzvimbo dzakanyanya kunaka uye kuti bhodhi rega rega rakadhindwa nemazvo.Chero bedzi vari kupinda mukati, hapafanirwe kunge paine nyaya dzekubuda kwavo.
7. Ramba wakatarisa Stencil Cleaning
Mushure mekupfuura kwega kwega, iwe unofanirwa kuchenesa yakawandisa solder paste kana kubuda kubva pane stencil.Kana ukasachengeta zvakawandisa mukutarisa, zvinozoendeswa kumabhodhi emangwana panguva yekugadzira.Izvi zvakawandisa zvinozoita bhero pamusoro kana mafashama pads uye kugadzira mabhora.
Zvakanaka kuchenesa mafuta akawandisa uye solder kubva kune stencil mushure mekutenderera kwese kudzivirira kuvaka.Chokwadi, zvinogona kutora nguva, asi zviri nani kumisa nyaya isati yawedzera.
Solder mabhora ndiwo ane mutsetse wechero EMS musangano wekugadzira mutsara.Matambudziko avo ari nyore, asi zvikonzero zvawo zvakawanda.Nenzira yakanaka, imwe neimwe nhanho yekugadzira nzira inopa nzira itsva yekudzivirira kuti irege kuitika.
Ongorora maitiro ako ekugadzira uye ona kwaunogona kushandisa matanho ari pamusoro kudzivirirakusikwa kwemabhora ekutengesa mukugadzira SMT.
Nguva yekutumira: Mar-29-2023