Iziphene zeNkqubo ye-SMT eqhelekileyo kunye neZisombululo: Isikhokelo esipheleleyo seNdibano ye-PCB ethembekileyo

Kutheni uLawulo oluLungileyo lweNkqubo ye-SMT lubalulekile
I-Surface Mount Technology (SMT) ifuna ukuchaneka kwe-micron kwinqanaba le-micron ekubekweni kwe-paste, ukubekwa kwe-component, kunye nolawulo lobushushu. Utshintsho kuyilo lwe-stencil, umthamo we-solder paste, okanye iiprofayili ze-reflow zinokubangela iziphene ezibeka emngciphekweni ukuthembeka kwemveliso—ingakumbi kuyilo oluxineneyo, olukhawulezayo, okanye olune-multilayer. Kwizicelo ze-aerospace, iimoto, ezonyango, kunye neze-telecom, iziphene ze-SMT ezingabonwanga zinokubangela ukusilela okukhulu kwentsimi. Esi sikhokelo sichaza iziphene ezixhaphakileyo ze-SMT, izizathu zazo eziphambili, kunye nezisombululo zobunjineli.

1. Ukutyhilwa Kwamatye Engcwabeni (Isiphumo saseManhattan)

Inkcazo: Icandelo le-chip (umz., 0201/0402) liphakama ngokuthe nkqo ngexesha lokuphinda liphume, lahlukane nephedi enye.

Izizathu zobugcisa:

• ·Umthamo wepaste ye-solder engalinganiyo phakathi kweepads ezidityanisiweyo
• ·Ubunzima bobushushu obungalinganiyo (umz., ububanzi bomkhondo obungalinganiyo okanye ukuthululwa kobhedu)
• ·Isantya sokuhamba kwakhona kwe-ramp esigqithisileyo (>2°C/sec)
• ·Uyilo lwe-stencil aperture olungaphuculwanga
• ·I-geometry yephedi ephula imithetho yokulinganisa ye-IPC-7351

Izisombululo zoBunjineli:

• ·Uyilo lweepadi/iimpawu ezilinganayo ngokwe IPC-7351B izikhokelo
• ·Tshatisa ubungakanani/umthamo we-stencil aperture kwiiphelo zecandelo
• ·Nciphisa izinga lokuhamba kwakhona kwerempu ukuya kwi 1–2°C/umzuzwana
• ·Faka i-aperture overprint (kwii-passives ezingama-≤01005)
• ·Kuphephe ukubekwa kwezinto kufutshane neeplani ezinkulu zobhedu

2. Ukudibanisa iSolder

Inkcazo: Uqhagamshelo lwesolder olungalindelekanga phakathi kwee-conductors/pads ezikufutshane.

Izizathu zobugcisa:

• ·Iimbobo ezinkulu zestencil okanye umthamo omkhulu wepaste
• ·Idama lemaski yesolder enganelanga (
• ·Ukukhululwa kakubi kwepeyinti (umz., umlinganiselo ongonelanga we-aspect stencil)
• ·Ukungalingani ngexesha lokuprinta istencil

Izisombululo zoBunjineli:

• ·Sebenzisa iindlela zokunciphisa ukuvuleka kwe-aperture (umz., “ithambo lenja” kwi-QFPs, “ipleyiti yasekhaya” kwi-BGAs)
• ·Lungiselela umlinganiselo womngxuma (≥1.5kunye nomlinganiselo wendawo (≥0.66)
• ·Cacisa ububanzi bedama lemaski yesolder ≥0.025mm kwiindlela zoyilo lwepitch ecolekileyo
• ·Sebenzisa Uhlolo lwe-3D Solder Paste (SPI)
• ·Qinisekisa iindlela zokucoca istencil

3. Ukunyibilikisa okunganelanga (Amalungu angamanzi/avulekileyo)

Inkcazo: Ibhondi yesinyithi engaphelelanga ngenxa yokungafakwa kakuhle kwe-solder.

Izizathu zobugcisa:

• ·Umthamo wokuncamathisela onganelanga
• ·Iprofayili yokuphinda ibuyele kwisantya esiphantsi (ubushushu obuphantsi okanye i-TAL)
• ·Ukuxinana kwePad/icandelo
• ·Ncamathisela ukomisa xa ixesha elide

Izisombululo zoBunjineli:

• ·Ukulungiswa kokuhamba kwakhona: Incopho engama-240–245°C, 60–90s TAL
• ·Sebenzisa Uhlobo lwe-4/5 paste
• ·Cacisa Ukugqitywa kwe-SINGLE/SINGLE
• ·Ulawulo lwendawo yokuprinta: 25±3°C, 40–60% RH

4. Utshintsho/Ukungalingani kweCandelo

Inkcazo: Ukufuduka kwecandelo ngexesha lokuphuma kwakhona kwamanzi.

Izizathu zobugcisa:

• ·I-paste tack engonelanga
• ·Iingxaki zokungcangcazela/ukushukuma kwe-conveyor
• ·Amandla omlomo angachanekanga/ubude buka-z
• ·I-PCB warpage kufutshane ne-Tg

Izisombululo zoBunjineli:

• ·Amandla okuncamathisela i-tick >500g/mm²
• ·Linganisa ukuchola nendawo: ≤30μm ukuchaneka, amandla angama-0.2–0.5N
• ·Lawula isantya sefeni kunye nokungcangcazela komthumeli
• ·Sebenzisa FR-4 Tg170+ okanye inkxaso yezinto ezisetyenziswayo

5. IiVoids zeSolder Joint

Inkcazo: Ukuvaleka kwegesi okudala imingxunya emalungeni.

Iindawo Ezinobungozi Obuphezulu: Iiphedi zobushushu ze-QFN, iibhola ze-BGA, ii-vias ezinombane ophezulu.

Izizathu zobugcisa:

• ·Ii-volatiles ze-flux zokubamba i-ramp ngokukhawuleza
• ·Ukufuma kwizinto ze-MSL 2a+ ezingabhakwanga
• ·Nge-in-pad ngaphandle kokugcwalisa/ukuvala
• ·Ukuziphatha kakubi kokumanzisa

Izisombululo zoBunjineli:

• ·Isantya sokunyuka: 1.0–1.5°C/umzuzwana
• ·Bhaka kwangaphambili nge J-STD-033
• ·Ii-Vias ezizaliswe/ezigqunyiweyo
• ·Sebenzisa i-vacuum reflow okanye i-paste engasebenzisi mandla aneleyo

6. Intloko-e-Umqamelo (I-HIP)

Inkcazo: Ibhola ye-BGA iyancamathisela kodwa ayihlangani.

Izizathu zobugcisa:

• ·Ukungafani kwe-Warpage
• ·Iibhola ze-solder ezifakwe i-oxidized
• ·Imfutshane kakhulu i-TAL

Izisombululo zoBunjineli:

• ·Bhaka ii-BGA: 125°C/12–24hr
• ·Sebenzisa i-flux ngomsebenzi we-≥0.2%
• ·Yandisa i-TAL ukuya kwi->90s, qinisekisa nge-X-ray
• ·Lungiselela i-stackup yolawulo lwe-warpage

7. I-Solder Ball Splatter

Inkcazo: Iibhola ezithengiswa nge-micro-solder (

Izizathu zobugcisa:

• ·Irempu enamandla (>3°C/sec)
• ·I-alloy engaguqukiyo: intlama yokutyibiliza
• ·Ungcoliseko lwephedi
• ·Ukunamathela kwemaski yesolder ebuthathaka

Izisombululo zoBunjineli:

• ·Intlama engacocekanga eneresini ezizinzileyo
• ·Irempu yokufudumeza: 1.0–1.5°C/sec ukuya kwi-150–180°C
• ·Faka ukucoca ngeplasma
• ·Cacisa imaski yesolder ene-CTI >175V

8. Ukuphakamisa/Ukudiliza iiPad

Inkcazo: Ukwahlulwa kwephedi kwisiseko sePCB.

Izizathu zobugcisa:

• ·Imijikelo yokuphinda usebenze ngokugqithisileyo
• ·Izinto ze-z-axis CTE okanye ze-Tg eziphantsi
• ·Ukufunxwa komswakama

Izisombululo zoBunjineli:

• ·Nciphisa ukuya kwi-≤2 imijikelo yobushushu ngephedi nganye
• ·Sebenzisa izixhobo zokuhlaziya ezilawulwa yi-thermocouple
• ·Bhaka iiPCB: 125°C/4–8 iiyure (IPC-1601)
• ·Sebenzisa iilaminate: Tg >170°C, Td >340°C

Uthintelo oluCwangcisiweyo lweSiphene se-SMT

• ·I-DFM: Ukuhlolwa kwepateni yomhlaba ye-IPC-2581, IPC-7351B
• ·Uhlolo: I-Inline SPI → AOI → Iprofayili ye-oven ye-AXI, KIC
• ·Izixhobo: I-MSL nganye nge-IPC-J-STD-033, uvavanyo lwe-SLP
• ·Uqeqesho: Isiqinisekiso se-IPC-A-610H, i-IPC-7711/7721

Fumana i-Zero-Defect SMT ngovuyo olupheleleyo olutyebileyo

I-SMT ethembekileyo ifuna ubuchule bokusebenzisana kwezinto, inkqubo, uyilo. Uvuyo Olupheleleyo Olutyebileyo, sinikezela nge-PCBA ebalulekileyo ngomsebenzi wethu ngokusebenzisa:

• ·I-DFM ephuculweyo yiNkqubo: Ingxelo yexesha langempela ngeValor NPI
• ·Uhlolo oluPhambili: I-3D SPI, i-AOI eqhutywa yi-AI, i-X-reyi ye-5μm
• ·Indibano yokuthembeka okuphezulu: μBGA (0.2mm), i-QFN voiding
• ·Ukulandeleka: Ukubhalwa kwembali yozalo kwinqanaba leenxalenye

Qhagamshelana nathi ukuze kuhlolwe i-DFM yasimahla kunye nokuhlolwa kwenkqubo ye-SMT.