Menene PCB SMT Stencil (Sashe na 8)

Bari ' s ci gaba da koyo game da buƙatun {4904910} na Farashin SMT.

Babban masana'anta na iya karɓar nau'ikan daftarin aiki iri uku masu zuwa don yin stencil:

1. Fayilolin ƙira da software na ƙira na PCB suka ƙirƙira, tare da sunan kari shine "*.PCB".

2. Fayilolin GERBER ko fayilolin CAM da aka fitar daga fayilolin PCB.

3. Fayilolin CAD, tare da sunan kari shine "*.DWG" ko "*.DXF".

Bugu da ƙari, kayan da muke buƙata daga abokan ciniki don yin samfuri gabaɗaya sun haɗa da yadudduka masu zuwa:

1. Tsarin kewayawa na allon PCB (wanda ya ƙunshi cikakkun kayan don yin samfuri).

2. Layin siliki na allo na PCB (don tabbatar da nau'in ɓangaren da gefen bugu).

3. Wurin zaɓe da wuri na allon PCB (an yi amfani da shi don buɗaɗɗen ƙirar samfuri).

4. Zauren abin rufe fuska na allon PCB (an yi amfani da shi don tabbatar da matsayi na fatun da aka fallasa akan allon PCB).

5. Layin rawar jiki na allon PCB (an yi amfani da shi don tabbatar da matsayin abubuwan haɗin ramuka da ta hanyar da za a guje wa).

Tsarin buɗaɗɗen stencil ya kamata yayi la'akari da rushewar manna mai solder, wanda aka ƙaddara ta hanyar abubuwa uku masu zuwa: {24920826}

1) Matsakaicin rabo/Rabin yanki na buɗaɗɗen: Matsala shine rabon faɗin buɗaɗɗen buɗaɗɗe zuwa kauri na stencil. Matsakaicin yanki shine rabon yankin buɗaɗɗen zuwa ɓangaren giciye na bangon rami. Don cimma sakamako mai kyau na rushewa, rabon al'amari ya kamata ya zama mafi girma fiye da 1.5, kuma yanki ya kamata ya fi 0.66.

Lokacin zayyana apertures don stencil, bai kamata mutum ya ci gaba da bin yanayin rabo ko yanki a makance ba yayin da yake watsi da wasu al'amurran tsari, kamar gada ko wuce gona da iri. Bugu da ƙari, don abubuwan da suka fi girma fiye da 0603 (1608), ya kamata mu yi la'akari da yadda za a hana ƙwallo.

2) Siffar geometric na gefen bangon buɗaɗɗen buɗaɗɗen: Ƙaƙƙarfan buɗaɗɗen ya kamata ya zama 0.01mm ko 0.02mm fadi fiye da budewar babba, wato, buɗaɗɗen ya kasance a cikin siffar juzu'i mai jujjuya, wanda ke sauƙaƙe. da santsi saki na solder manna da kuma rage yawan stencil cleanings. A ƙarƙashin yanayi na al'ada, girman buɗewa da siffar stencil na SMT iri ɗaya ne da kushin, kuma ana buɗe su a cikin hanyar 1:1. A ƙarƙashin yanayi na musamman, wasu abubuwan SMT na musamman suna da ƙayyadaddun ƙa'idodi don girman buɗaɗɗen buɗaɗɗiya da siffar stencil ɗin su.

3) Ƙarshen shimfidar wuri da santsi na ganuwar rami: Musamman ga QFP da CSP tare da farar ƙasa da 0.5mm, ana buƙatar masana'anta na stencil don yin electro-polishing yayin aikin samarwa.

Za mu koyi wasu ilimi game da PCB SMT stencil a labarin labarai na gaba.

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