Mavuto odziwika bwino ndi mayankho munjira ya SMT

Tonsefe tikuyembekeza kuti ndondomeko ya SMT ndi yangwiro, koma zenizeni ndi zankhanza.Zotsatirazi ndi zina zokhudzana ndi zovuta zomwe zingatheke pazinthu za SMT ndi zotsutsana nazo.

Kenako, tikufotokoza nkhani zimenezi mwatsatanetsatane.

1. Chochitika cha tombstone

Tombstoneng, monga momwe tawonetsera, ndi vuto lomwe zigawo za pepala zimakwera mbali imodzi.Chilemachi chikhoza kuchitika ngati kugwedezeka kwa pamwamba kumbali zonse za gawolo sikuli koyenera.

Kuti izi zisachitike, titha:

• Kuwonjezeka kwa nthawi muzone yogwira ntchito;
• Konzani mapangidwe a pad;
• Kuletsa makutidwe ndi okosijeni kapena kuipitsidwa kwa chigawo malekezero;
• Sinthani magawo a osindikiza a solder phala ndi makina oyika;
• Sinthani kapangidwe ka ma template.

2. Solder mlatho

Pamene solder phala amapanga kugwirizana zachilendo pakati zikhomo kapena zigawo zikuluzikulu, amatchedwa solder mlatho.

Zotsutsana ndi izi:

• Sinthani chosindikizira kuti muwongolere mawonekedwe osindikiza;
• Gwiritsani ntchito solder phala ndi mamasukidwe olondola;
• Konzani kabowo pa template;
• Konzani makina osankha ndikuyika kuti musinthe malo ndikugwiritsa ntchito kukakamiza.

3. Zigawo zowonongeka

Zigawo zimatha kukhala ndi ming'alu ngati zidawonongeka ngati zopangira kapena pakuyika ndikubwezeretsanso

Pofuna kupewa vutoli:

• Onani ndi kutaya zinthu zowonongeka;
• Pewani kukhudzana zabodza pakati pa zigawo ndi makina panthawi ya SMT processing;
• Yesetsani kuzizira pansi pa 4°C pa sekondi iliyonse.

4. kuwonongeka

Ngati mapiniwo awonongeka, amachotsa mapepalawo ndipo gawolo silingagulitsidwe ku mapepala.

Kuti tipewe izi, tiyenera:

• Yang'anani zakuthupi kuti mutaya mbali ndi zikhomo zoipa;
• Yang'anani mbali zomwe zayikidwa pamanja musanazitumize ku ndondomeko yobwezeretsanso.

5. Malo olakwika kapena malingaliro a magawo

Vutoli limaphatikizapo zochitika zingapo monga kusalinganiza molakwika kapena mawonekedwe olakwika / polarity pomwe magawo amawokeredwa mbali zosiyana.

Zotsutsa:

• Kuwongolera magawo a makina oyika;
• Yang'anani magawo omwe aikidwa pamanja;
• Pewani kukhudzana ndi zolakwika musanalowe mu ndondomeko ya reflow;
• Sinthani kayendedwe ka mpweya mukamayendereranso, zomwe zitha kuwomba mbaliyo kuti ichoke pamalo ake olondola.

6. Solder phala vuto

Chithunzichi chikuwonetsa zochitika zitatu zokhudzana ndi voliyumu ya solder paste:

(1) Solder kwambiri

(2) Solder yosakwanira

(3) Palibe solder.

Pali zinthu zitatu zomwe zimayambitsa vutoli.

1) Choyamba, mabowo a template akhoza kutsekedwa kapena olakwika.

2) Chachiwiri, kukhuthala kwa solder phala sikungakhale kolondola.

3) Chachitatu, kusokonekera kosakwanira kwa zigawo kapena mapepala kungayambitse kusakwanira kapena kusakhala ndi solder.

Zotsutsa:

• template yoyera;
• Kuonetsetsa kuti ma templates ali ofanana;
• Kuwongolera kolondola kwa voliyumu ya solder phala;
• Tayani zigawo kapena mapepala okhala ndi solderability otsika.

7. Zolumikizira zodulira zachilendo

Ngati njira zina zogulitsira sizikuyenda bwino, zolumikizira za solder zimapanga mawonekedwe osiyanasiyana komanso osayembekezeka.

Mabowo osawoneka bwino a stencil atha kubweretsa (1) mipira yogulitsira.

Oxidation ya mapepala kapena zigawo zikuluzikulu, nthawi yosakwanira mu gawo lonyowa komanso kukwera mofulumira kwa kutentha kwa reflow kungayambitse mipira ya solder ndi (2) mabowo a solder, kutentha kochepa kwa soldering ndi nthawi yochepa ya soldering kungayambitse (3) ma icicles a solder.

Zotsutsana nazo ndi izi:

• template yoyera;
• Kuphika ma PCB musanayambe kukonza ma SMT kuti mupewe okosijeni;
• Sinthani bwino kutentha pa nthawi yowotcherera.

Zomwe zili pamwambazi ndizovuta zamtundu wamba ndi mayankho omwe amaperekedwa ndi wopanganso reflow soldering Chengyuan Viwanda munjira ya SMT.Ndikukhulupirira kuti zikhala zothandiza kwa inu.