Cikakken Bayani Kan Tsarin Haɗa SMT: Daga Allon Bare zuwa Samfurin Ƙarshe

Gabatarwa: Muhimmancin Fahimtar Tsarin Taro na SMT

Fasahar Dutsen Surface (SMT) ita ce ginshiƙin masana'antar lantarki ta zamani. Tana ba da damar sanya kayan aiki cikin sauri da daidaito kai tsaye a saman allon da'ira da aka buga (PCBs). Yayin da na'urori suka ƙara ƙanƙanta, ƙarfi, da haɗin kai, hanyoyin SMT dole ne su tabbatar da aminci mara matsala, juriya mai ƙarfi, da kuma ingancin soldering mai kyau.

Ko kai injiniyan ƙira ne wanda ke shirin samar da kayayyaki, ƙwararren mai siye da ke tantance masu siyar da kayayyaki na EMS, ko kuma injiniya mai inganci wanda ke sa ido kan yawan amfanin ƙasa, fahimtar cikakken tsarin SMT yana da mahimmanci.

Wannan labarin ya ba da cikakken bayani game da layin samar da SMT, tun daga lokacin da allon da ba shi da komai ya shiga layin har zuwa lokacin da zai zama PCBA mai cikakken gwaji, wanda aka shirya don isarwa.

Mataki na 1: Karɓar PCB, Yin Gasa, da Shiri

Kafin shiga layin SMT, dole ne a duba PCBs marasa komai a gani da girma, musamman ga allon mai yawan mita, mai lanƙwasa da yawa, ko HDI. Ma'auni masu mahimmanci sun haɗa da warpage, oxidation a saman pad, da kauri na allo.

Jin Daɗin Danshi: Laminates masu yawan Tg ko PTFE suna da sauƙin kamuwa da danshi. Yin gasa kafin a yi a zafin 105–125°C na tsawon awanni 4–12 (bisa ga umarnin IPC) yana hana lalacewa, ƙananan fasa, da kuma gurɓatattun abubuwa yayin sake kwarara.

Mataki na 2: Buga Manna na Solder

Manna mai laushi, wanda aka yi da kashi 90% na ƙarfe da kuma kashi 10% na ruwa, ana buga shi a kan faifan PCB da aka fallasa ta amfani da stencil na bakin ƙarfe mai daidaito.

• Kauri na Stencil: microns 100-150 dangane da matakin kayan
• Tsarin Stencil: Girman Buɗewa, rabon rage kushin, matakai-ƙasa
• Sigogi na Bugawa: Saurin matsewa, matsin lamba, saurin rabuwa
• Nau'in Manna: Nau'i na 3 don daidaitaccen tsari, Nau'i na 4 ko 5 don ƙaramin tsari ko micro-BGA

Daidaitaccen bugu na manne na solder yana da mahimmanci don cimma daidaiton jika da kuma hana lahani kamar gadawa, rashin isasshen solder, da kuma jefe kabari.

Mataki na 3: Duba Manna Mai Solder (SPI)

Tsarin SPI mai sarrafa kansa yana amfani da triangulation na laser 2D ko 3D don aunawa:

• Tsawon manna
• Daidaiton girma
• Daidaito tsakanin stencil da offset
• Gano gada da kimantawar rashin komai

SPIs suna da mahimmanci don sarrafa tsari da wuri, yana rage yaɗuwar lahani a ƙasa.

Mataki na 4: Zaɓi da Wuri Mai Sauri

Tsarin zaɓe-zaɓe yana ɗora sassan SMT a kan faifan da aka rufe da manne mai laushi. Tsarin zamani na iya jurewa:

• Abubuwan da ba su da amfani kamar 01005
• ICs tare da fakitin QFN, LGA, da BGA masu kyau
• Abubuwan da ba su da siffofi masu kama da juna tare da algorithms na hangen nesa na musamman
• Sanya gefen sama da ƙasa a lokaci guda

La'akari da Gudanar da Sassan:

• Nau'in ciyarwa: Reel, tire, sanda
• Duba gani don juyawa da daidaitawa
• Tsawo da kuma kula da haɗin gwiwa
• Kariyar lantarki yayin ɗaukar kaya

Injinan kamar Yamaha, Panasonic, ko Juki na iya isa ga saurin sanyawa sama da 80,000 CPH tare da daidaito mafi kyau fiye da ± microns 30.

Mataki na 5: Sake kunna wutar lantarki

Allon yanzu suna shiga cikin tanda mai sake kwarara, wanda ke da yankuna har 10 da zafin jiki ke sarrafawa. Kowane yanki yana aiki don kawo allon a hankali zuwa wurin narkewar solder, sannan ya sanyaya shi ba tare da haifar da matsin lamba na zafi ba.

• Yankin da zafafawa: 80–150°C
• Yankin Jiƙa: 150–180°C don kunna kwararar ruwa
• Sake Buɗe Kololuwar Ruwa: 230–250°C (ya danganta da ƙarfen solder)
• Yankin Sanyaya: Saurin saukowa zuwa ƙasa da 180°C don samar da gidajen haɗin gwiwa masu ƙarfi

Kowace taron PCB dole ne a yi mata bayanin yanayin zafi don daidaita lanƙwasa bisa ga tarin kayan, yawan sassan, da kuma shan zafi na substrate.

Mataki na 6: Dubawar Ganuwa ta atomatik (AOI)

Bayan sake kunna wutar, injunan AOI suna kwatanta hoton allon da aka solder a ainihin lokacin da aka yi amfani da shi azaman alamar zinare.

• Polarity da kuma yanayin
• Kasancewa da rashin
• Fillet ɗin solder na gubar
• Gajerun da'irori, jakunkunan da aka ɗaga, da gidajen sanyi

AOIs na zamani suna amfani da kyamarori masu kusurwa da yawa, ƙirar 3D, da koyon injin don inganta ƙimar ganowa, musamman don shimfidar wurare masu yawa.

Mataki na 7: Dubawar X-Ray don Fakitin Rikice-rikice

Abubuwa kamar BGAs, LGAs, da QFNs suna da ɓoyayyun haɗin solder a ƙarƙashin fakitin. Binciken X-ray yana ba da damar:

• Tabbatar da jika ƙwallon solder
• Gano ɓarna a cikin wutar lantarki da ƙasa
• Binciken murfin murfin zafi
• Gada da kuma ɗan gajeren ganewa

Ana samun na'urar daukar hoton CT ta 3D don ci gaba da bincike kan tushen cutar da kuma binciken gazawarta.

Mataki na 8: Dubawa da Sake Aiki da Hannu

Ko da a cikin layukan atomatik, ana buƙatar sa hannun ɗan adam don:

• Duba gani a ƙarƙashin na'urorin microscopes
• haɗa kayan aiki
• Sauya abubuwan da aka yi wa kabari ko kuma waɗanda ba a daidaita su ba
• Sake yin aikin BGA ta amfani da tashoshin gyaran iska mai zafi

Dole ne sake yin aiki ya bi ƙa'idodin IPC-7711/21 kuma a yi rajista a cikin tsarin bin diddigin bayanai.

Mataki na 9: Gwajin Cikin-Da'ira (ICT) da Gwajin Aiki (FCT)

Gwaji yana tabbatar da aiki da inganci na samfurin kafin a kawo shi.

Siffofin ICT:

• Yana auna juriya, ƙarfin lantarki, da ƙarfin lantarki
• Yana gano abubuwan da aka buɗe, gajeru, ɓacewa, ko ba daidai ba
• An yi shi ne da kayan aiki, ta amfani da maƙallin ƙusa

Fasaloli na FCT:

• Yana kwaikwayon halayen samfura na gaske
• Yana sadarwa da microcontrollers ko firikwensin
• Zai iya haɗawa da gwajin haɗin UART, I2C, SPI, ko CAN

Mataki na 10: Haɗawa na Ƙarshe, Lakabi, da Marufi

Da zarar gwaje-gwajen lantarki sun wuce, kwamitin gudanarwa ya ci gaba zuwa matakai na ƙarshe:

• Haɗawa da haɗa kebul
• Shigar da murfin bango ko shafi mai tsari
• Tsaftace ultrasonic ko narkewar sinadarai (babu tsaftacewar zaɓi)
• Alamar Laser ko lakabin barcode
• Marufi mai hana tsayawa da kuma lakabin musamman

Masu samar da EMS masu ci gaba suna ba da cikakken bin diddigin kowane yanki, kowace lambar serial, ko kowace naúra, ya danganta da ƙa'idodin masana'antu.

Taro na SMT shine gadar daga Zane zuwa Aiki

Haɗa SMT tsari ne mai matuƙar wahala wanda ke buƙatar cikakken iko, kulawa akai-akai, da ƙwarewa a fannoni daban-daban. Kowane mataki—daga tattara manna zuwa dubawa da kuma marufi na ƙarshe—dole ne a inganta shi don tabbatar da inganci da aiki.

A Rich Full Joy, muna tallafawa PCBs masu saurin gaske, masu saurin gaske, masu matakai da yawa, da kuma masu matuƙar muhimmanci ga aiki tare da:

• Kayan aikin SMT masu ci gaba da kuma sake fasalin bayanan martaba
• Kwarewar BGA, QFN, da RF module
• Ƙarfin X-Ray, AOI, SPI, da ICT/FCT a cikin gida
• Lokutan jagora kaɗan da samfuran ƙarancin girma
• Haɗin gwiwa na dogon lokaci a fannin sararin samaniya, sadarwa, likitanci, da masana'antar kera motoci

Kuna neman ƙwararren abokin hulɗa na SMT don samfurinku na gaba? Tuntuɓi ƙungiyar injiniyanmu a yau don yin bita kyauta ta DFM da kuma farashi mai sauri.