I-YouTube
A. Isifinyezo sokucaciswa
Ukucaciswa kwesixhumi esilingana ngokucindezela esikuthuthukisile sithi
kufinyezwe kuThebula II.
Kuthebula II, "Usayizi" usho ububanzi bokuxhumana besilisa (okuthiwa "Usayizi Wethebhu") ngo-mm.
B. Ukunqunywa Okufanelekile Kwebanga Lokuxhumana
Njengesinyathelo sokuqala sokwakhiwa kwetheminali yokulinganisa umshini, kufanele
thola uhla olufanele lwamandla okuxhumana.
Ngale njongo, imidwebo yesici se-deformation ye
amatheminali kanye nezimbobo ezidlulayo zidwetshwa ngokohlelo, njengoba kukhonjisiwe
ku-Fig. 2. Kuboniswa ukuthi amandla okuxhumana aku-eksisi eqondile,
ngenkathi osayizi betheminali kanye namadayamitha we-hole ku-
i-eksisi evundlile ngokulandelana.
C. Ukunqunywa Kwamandla Okuxhumana Okuncane
Amandla amancane okuxhumana anqunywe ngu-(1)
ukuhlela ukumelana nokuxhumana okutholwe ngemva kokubekezela
izivivinyo ku-eksisi eqondile kanye namandla okuxhumana okuqala avundlile
eksisi, njengoba kukhonjisiwe kuFig. 3 ngokohlelo, kanye (2) nokuthola
amandla amancane okuxhumana njengokuqinisekisa ukumelana nokuxhumana
ephansi futhi ezinzile.
Kunzima ukukala amandla okuxhumana ngqo ngokusebenza kokuxhumana kwe-press fit, ngakho sikuthole kanje:
(1) Ukufaka amatheminali ezimbotsheni ezidabulayo, ezinawo
ububanzi obuhlukahlukene ngaphezu kobubanzi obunqunyiwe.
(2) Ukulinganisa ububanzi betheminali ngemva kokufakwa kusukela ku-
cross section cut isampula (isibonelo, bheka Fig. 10).
(3) Ukuguqula ububanzi betheminali obukalwe ngo-(2) bube yi-
amandla okuxhumana esebenzisa isici sokuguquguquka
umdwebo wetheminali etholwe empeleni njengoba kuboniswe ku
Umdwebo 2.
Imigqa emibili yetheminali deformation isho ukuthi
ubukhulu kanye nobuncane bosayizi betheminali ngenxa yokuhlakazeka phakathi
inqubo yokukhiqiza ngokulandelana.
Ithebula II Ukucaciswa Kwesixhumi esisikhiqizile
Kuyacaca ukuthi amandla okuxhumana akhiqizwe phakathi
amatheminali kanye nezimbobo nakuba zinikezwa ngokuphambana kwezindlela ezimbili
imidwebo yamatheminali kanye nezimbobo ku-Fig. 2, okuyinto
kusho isimo esilinganiselwe sokuminyaniswa kwetheminali nangokunwetshwa kwembobo.
Sinqume (1) amandla amancane okuxhumana
okudingekayo ukwenza ukumelana nokuxhumana phakathi kwamatheminali kanye
nakuba-izimbobo ziphansi futhi zizinzile ngaphambi / ngemva kokubekezela
izivivinyo zokuhlanganiswa kosayizi obuncane betheminali kanye
ubukhulu be-diameter yembobo, kanye (2) namandla amakhulu
okwanele ukuze kuqinisekiswe ukumelana nokwahlukanisa phakathi kwendawo eseduze
izimbobo zidlula inani elishiwo (109Q yalokhu
development) kulandela izivivinyo zokukhuthazela ze
inhlanganisela yobukhulu bobukhulu betheminali nobuncane
ngokusebenzisa imbobo ububanzi, lapho ukonakala insulation
ukumelana kubangelwa ukumuncwa komswakama ku
indawo eyonakele (encishiwe) ku-PCB.
Ezigabeni ezilandelayo, izindlela ezisetshenziselwa ukunquma
ubuncane kanye namandla okuxhumana aphezulu ngokulandelana.
D. Ubuningi Bokunqunywa Kwamandla Okuxhumana
Kungenzeka ukuthi i-interlaminar delaminations ku-PCB ifake
ukwehla kokumelana ne-insulation ezingeni lokushisa eliphezulu kanye nokungena
umoya omswakama lapho ungaphansi kwamandla okuxhumana amaningi,
okukhiqizwa ukuhlanganiswa kobuningi
usayizi wetheminali kanye nobubanzi obuncane bembobo.
Kulokhu kuthuthukiswa, amandla okuxhumana aphezulu avumelekile
itholwe kanje;(1) inani lokuhlola le-
ubuncane bebanga elivumelekile lokwahlukanisa elithi "A" ku-PCB lali
etholwe ngokuhlolwa kusengaphambili, (2) okuvumelekile
ubude be-delamination bubalwe ngokwejometri njenge-(BC A)/2, lapho u-"B" kanye no-"C" kungumsindo wokugcina kanye
ububanzi bembobo ngokulandelana, (3) i-delamination yangempela
ubude ku-PCB ngamadayamitha ahlukahlukene embobo iye yaba
etholwe ngokuhlolwa futhi yahlelwa ngobude obuncishisiwe
uma kuqhathaniswa nomdwebo wokuqala wamandla othintana naye, njengoba kuboniswe kumfanekiso wesi-4
ngohlelo.
Ekugcineni, amandla okuxhumana aphezulu anqunywe kanjalo
ukuze angeqi ubude obuvumelekile bokuhlukanisa.
Indlela yokulinganisa yamandla okuxhumana iyafana ne
kushiwo esigabeni esandulele.
E. I-Terminal Shape Design
Umumo wetheminali uklanywe ngendlela yokuthi ukhiqize
amandla okuxhumana afanelekile (N1 kuya ku-N2) emgodini onqunyiwe
ububanzi be-diameter ngokusebenzisa i-elementi enomkhawulo wobukhulu obuthathu
izindlela (FEM), kufaka phakathi umphumela we-deformation yangaphambi kwepulasitiki
ukukhuthaza ekukhiqizeni.
Ngenxa yalokho, siye samukela i-terminal, emise okwe-an
"Isigaba esiphambanayo somumo ongu-N" phakathi kwamaphoyinti okuxhumana eduze ne-
phansi, osekukhiqize amandla okuxhumana acishe afane
ngaphakathi kobubanzi obunqunyiwe bobubanzi bembobo, nge a
imbobo ebhoboziwe eduze kwethiphu evumela umonakalo we-PCB ukuba ube
kuncishisiwe (Fig. 5).
Kuboniswe ku-Fig. 6 isibonelo se-three-dimensional
Imodeli ye-FEM namandla okusabela (okungukuthi, amandla okuxhumana) vs
umdwebo wokugudluka otholwe ngokuhlaziya.
F. Ukuthuthukiswa Kwe-Hard Tin Plating
Kunezinhlobo ezahlukene zokwelapha zangaphandle zokuvimbela
i-oxidization ye-Cu ku-PCB, njengoba kuchazwe ku-II - B.
Endabeni yokwelashwa kwe-metallic plating surface, njenge
ithini noma isiliva, ukuthembeka kokuxhumeka kukagesi kokucindezela-fit
ubuchwepheshe bungaqinisekiswa ngokuhlanganiswa ne
ezivamile Ni Plating terminals.Kodwa-ke, endabeni ye-OSP,ukufakwa kwamathini kumatheminali kufanele kusetshenziselwe ukuqinisekisa ukuthi isikhathi esideukuthembeka kokuxhumeka kukagesi.
Kodwa-ke, ukufakwa kwe-tin okujwayelekile kumatheminali (for
isibonelo, ukujiya okungu-1ltm) kukhiqiza ukukhuhlakwethiniphakathi nenqubo yokufaka itheminali.(Isithombe. "a" ku-Fig. 7)
futhi lokhu kukhishwa-off cishe kudala ama-short-circuits ngeamatheminali aseduze.
Ngakho-ke sesenze uhlobo olusha lukathayela oqinile
ukucwenga, okungaholeli ekutheni kukwalwe noma yiliphi ithiniokuqinisekisa ukwethembeka kokuxhumeka kukagesi kwesikhathi esidekanyekanye.
Le nqubo entsha yokucwenga iqukethe (1) ithini elincanyana elengeziwe
ukucwebezela endaweni engaphansi, (2) inqubo yokufudumeza (i-tin-reflow)
okwakha ungqimba oluqinile lwengxubevange yensimbi phakathi kwe
i-underplating kanye ne-tin Plating.
Ngoba izinsalela zokugcina ze-tin plating, okuyimbangela
yokukhuhla, kumatheminali iba mncane kakhulu futhi
isakaza ngokungafani kungqimba lwengxubevange, akukho ukukhuhlakweithini yaqinisekiswa ngesikhathi sokufakwa (Isithombe "b" kuUmfanekiso wesi-7).
Isikhathi sokuthumela: Dec-08-2022