{"id":8796,"date":"2023-09-22T12:22:10","date_gmt":"2023-09-22T10:22:10","guid":{"rendered":"https:\/\/smans.com\/knowledgeportal\/why-step-stencils-are-indispensable-in-your-pcb-assembly-5\/"},"modified":"2026-08-21T14:34:47","modified_gmt":"2026-08-21T12:34:47","slug":"why-step-stencils-are-indispensable-in-your-pcb-assembly-5","status":"publish","type":"knowledgeportal","link":"https:\/\/smans.com\/fr\/knowledgebase\/why-step-stencils-are-indispensable-in-your-pcb-assembly-5\/","title":{"rendered":"Pourquoi les pochoirs \u00e0 niveaux sont-ils indispensables dans l\u2019assemblage de vos PCB ?"},"content":{"rendered":"
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La miniaturisation des appareils et des composants \u00e9lectroniques est une v\u00e9ritable tendance. Les concepteurs repoussent constamment les limites physiques de la fabricabilit\u00e9. Par cons\u00e9quent, les ouvertures des pochoirs deviennent de plus en plus petites. Qui se souvient encore de l\u2019\u00e9poque o\u00f9 un composant de 2 x 3 mm \u00e9tait consid\u00e9r\u00e9 comme vraiment petit ? Aujourd\u2019hui, les composants de 0,2 x 0,4 mm<\/strong> ne sont plus une exception !<\/p>\n

Une fois la conception finalis\u00e9e et les PCB et composants achet\u00e9s, l\u2019\u00e9tape suivante consiste \u00e0 assembler l\u2019ensemble des \u00e9l\u00e9ments sur une ligne de production. \u00c0 ce stade, les pochoirs jouent un r\u00f4le essentiel<\/strong>.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<\/div>\n

\"PCB

Miniaturisation of PCB components over the years.<\/p><\/div>\n

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Pochoirs traditionnels vs pochoirs \u00e0 niveaux<\/h2>\n

Les pochoirs traditionnels ont une \u00e9paisseur uniforme sur toute leur surface. Avec la miniaturisation des composants, le besoin de pochoirs comportant des zones d\u2019\u00e9paisseurs diff\u00e9rentes, plus fines ou plus \u00e9paisses, s\u2019est accru.<\/p>\n

Ces types de pochoirs sont appel\u00e9s pochoirs \u00e0 niveaux (Step Stencils)<\/strong>.<\/p>\n

Les dimensions minimales des apertures du pochoir d\u00e9pendent de son \u00e9paisseur. Des apertures plus petites n\u00e9cessitent des pochoirs plus fins. Par cons\u00e9quent, le choix de la p\u00e2te \u00e0 braser doit \u00e9galement \u00eatre r\u00e9\u00e9valu\u00e9<\/strong>.<\/p>\n

\"Stepped

Example of Step Stencil<\/p><\/div>\n

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L\u2019importance de la p\u00e2te \u00e0 braser<\/h2>\n

La p\u00e2te \u00e0 braser est un m\u00e9lange de poudre de brasure \u00e0 grains fins et d\u2019un flux sous forme de gel. Elle fait l\u2019objet d\u2019une \u00e9volution constante. La granulom\u00e9trie de la p\u00e2te \u00e0 braser d\u00e9termine le remplissage des apertures. Plus le pochoir est fin, plus la p\u00e2te se lib\u00e8re facilement du pochoir et meilleur est son transfert vers le PCB.<\/p>\n

Il y a vingt ans, la poudre standard utilis\u00e9e dans les p\u00e2tes \u00e0 braser pr\u00e9sentait une granulom\u00e9trie comprise entre 25 et 45 \u00b5m<\/strong>. Aujourd\u2019hui, cette taille est pass\u00e9e \u00e0 15 \u00e0 25 \u00b5m<\/strong>.<\/p>\n

Les machines actuelles d\u2019impression de p\u00e2te \u00e0 braser doivent \u00eatre capables d\u2019imprimer des cartes \u00e9lectroniques complexes avec une pr\u00e9cision reproductible et tr\u00e8s \u00e9lev\u00e9e. Une conception de machine robuste, stable et technologiquement avanc\u00e9e est essentielle dans ce processus.<\/p>\n

Exceller dans l\u2019assemblage de PCB avec l\u2019imprimante \u00e0 pochoir ESE<\/h2>\n

La s\u00e9rie US-X<\/strong><\/a> d\u2019imprimantes \u00e0 pochoir de la c\u00e9l\u00e8bre marque sud-cor\u00e9enne ESE<\/strong> dispose de tous les atouts n\u00e9cessaires pour r\u00e9pondre aux exigences de production les plus \u00e9lev\u00e9es, voire les d\u00e9passer.<\/p>\n

Le c\u0153ur de la machine est sa table d\u2019impression unique et robuste, \u00e9quip\u00e9e de 4 vis \u00e0 billes et de 3 guides LM<\/strong>. Cette conception sp\u00e9cifique joue un r\u00f4le essentiel dans la stabilit\u00e9 du processus et permet d\u2019atteindre une pr\u00e9cision d\u2019impression de 10 \u00b5m<\/strong>, combin\u00e9e \u00e0 une r\u00e9p\u00e9tabilit\u00e9 de 12,5 \u00b5m<\/strong>.<\/p>\n

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La s\u00e9rie US-X d\u2019ESE<\/strong> est une machine tr\u00e8s compl\u00e8te qui offre plusieurs fonctionnalit\u00e9s particuli\u00e8rement int\u00e9ressantes :<\/p>\n

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  • Interface logicielle tr\u00e8s intuitive<\/li>\n
  • Inspection 2D<\/li>\n
  • Syst\u00e8me de nettoyage sous le pochoir<\/li>\n
  • Placement automatique des supports (support pins<\/em>)<\/li>\n
  • Contr\u00f4le du niveau de p\u00e2te \u00e0 braser<\/li>\n
  • Feedback SPI<\/li>\n
  • Serrage sans jeu du PCB<\/li>\n
  • Climatisation interne<\/li>\n
  • Cam\u00e9ra rapide<\/li>\n<\/ul>\n

    Feedback des donn\u00e9es SPI<\/h2>\n

    Un syst\u00e8me SPI (Solder Paste Inspection)<\/strong> est un \u00e9l\u00e9ment essentiel d\u2019une ligne d\u2019assemblage CMS. Il mesure la forme, le volume, la couverture et le positionnement de la p\u00e2te \u00e0 braser imprim\u00e9e sur le PCB. Lorsque ces mesures se situent en dehors des tol\u00e9rances, le syst\u00e8me SPI le signale et transmet les donn\u00e9es \u00e0 l\u2019imprimante ESE.<\/p>\n

    Le syst\u00e8me SPI peut, par exemple, signaler \u00e0 l\u2019imprimante ESE que certaines apertures sont obstru\u00e9es. L\u2019imprimante peut alors d\u00e9clencher un cycle de nettoyage suppl\u00e9mentaire sous le pochoir. L\u2019alignement dans l\u2019imprimante peut \u00e9galement \u00eatre corrig\u00e9.<\/p>\n

    SAKI Corporation<\/strong> est un fabricant de r\u00e9f\u00e9rence de syst\u00e8mes d\u2019inspection optique automatis\u00e9e pour l\u2019industrie \u00e9lectronique. Son syst\u00e8me d\u2019inspection 3D de la p\u00e2te \u00e0 braser contr\u00f4le rapidement et avec pr\u00e9cision l\u2019ensemble de la surface du PCB.<\/p>\n

    La combinaison de l\u2019imprimante ESE et du syst\u00e8me SPI de SAKI<\/strong> contribue ainsi \u00e0 une production tr\u00e8s fiable de semi-conducteurs et de PCB \u00e9lectroniques.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

    <\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<\/div>\n","protected":false},"featured_media":56607,"template":"","class_list":["post-8796","knowledgeportal","type-knowledgeportal","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"\nPourquoi les pochoirs \u00e0 niveaux sont-ils indispensables dans l\u2019assemblage de vos PCB ? - Smans<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez pourquoi les pochoirs \u00e0 niveaux sont essentiels pour l\u2019assemblage de PCB et comment leur \u00e9paisseur, les apertures et la p\u00e2te \u00e0 braser influencent l\u2019impression.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/smans.com\/fr\/knowledgebase\/why-step-stencils-are-indispensable-in-your-pcb-assembly-5\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pourquoi les pochoirs \u00e0 niveaux sont-ils indispensables dans l\u2019assemblage de vos PCB ? 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