{"id":4202,"date":"2020-11-06T13:20:11","date_gmt":"2020-11-06T12:20:11","guid":{"rendered":"https:\/\/smans.falkor.alcor.cloud\/news\/hoe-tombstoning-vermijden-tijdens-pcb-assemblage\/"},"modified":"2023-09-26T04:45:32","modified_gmt":"2023-09-26T04:45:32","slug":"comment-eviter-tombstoning-pendant-lassemblage-des-pcb","status":"publish","type":"news","link":"https:\/\/smans.com\/fr\/actualites\/comment-eviter-tombstoning-pendant-lassemblage-des-pcb\/","title":{"rendered":"Comment \u00e9viter tombstoning pendant l&rsquo;assemblage des PCB"},"content":{"rendered":"<h2>Tombstoning<\/h2>\n<p>Un probl\u00e8me qui se produit pendant le processus de soudage par refusion, en particulier dans un syst\u00e8me de refusion en phase vapeur ou en phase gazeuse.<\/p>\n<p>Cela signifie que <strong>les composants passifs de la microplaque<\/strong>, tels que les r\u00e9sistances et les condensateurs, <strong>restent debout<\/strong> pendant le soudage.<\/p>\n<h3>La cause de tombstoning<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-21063\" src=\"https:\/\/smans.com\/wp-content\/uploads\/2023\/09\/Tombstoning-1-1.png\" alt=\"tombstoning PCB component op PCB bord\" width=\"343\" height=\"165\" \/>La cause de ce probl\u00e8me se trouve dans <strong>l&rsquo;\u00e9coulement accidentel de p\u00e2te \u00e0 souder<\/strong> sur les deux extr\u00e9mit\u00e9s de contact du composant. Lorsque l&rsquo;une des deux extr\u00e9mit\u00e9s passe en phase liquide devant l&rsquo;autre, la p\u00e2te \u00e0 souder liquide tire le composant vers le haut.<\/p>\n<p>L&rsquo;\u00e9coulement accidentel est \u00e0 son tour caus\u00e9 par <strong>la charge thermique in\u00e9gale<\/strong> des surfaces de connexion de ce composant sur le PCB.<\/p>\n<h3>Les m\u00e9thodes de pr\u00e9vention de tombstoning<\/h3>\n<p>Il existe un certain nombre d&rsquo;options pour rem\u00e9dier \u00e0 ce d\u00e9faut de soudure. L&rsquo;action la plus logique mais aussi la plus radicale consiste \u00e0 <strong>redessiner les couches de cuivre<\/strong> du circuit imprim\u00e9 de mani\u00e8re \u00e0 \u00e9galiser la charge thermique sur les surfaces de soudure. Il s&rsquo;agit d&rsquo;un travail compliqu\u00e9 qui n\u00e9cessite l&rsquo;acc\u00e8s aux dossiers de conception et \u00e0 des connaissances sp\u00e9cialis\u00e9es. Dans de nombreux cas, cela n&rsquo;est pas possible pour un sous-traitant.<\/p>\n<p>Une autre option se situe au niveau de la conception du stencil. Cela permet d&rsquo;adapter la forme et la position de la p\u00e2te qui est press\u00e9e sur les surfaces de connexion du PCB. Cela n\u00e9cessite un nouveau pochoir, des connaissances sp\u00e9cialis\u00e9es et souvent quelques essais.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-21066 alignright\" src=\"https:\/\/smans.com\/wp-content\/uploads\/2023\/09\/Tombstoning-2-1.png\" alt=\"\" width=\"447\" height=\"87\" \/>Une option qui a <strong>le moins d&rsquo;impac<\/strong>t sur le processus de production et qui ne n\u00e9cessite pas de connaissances sp\u00e9cialis\u00e9es de la part de l&rsquo;utilisateur est de r\u00e9gler la p\u00e2te \u00e0 braser de mani\u00e8re \u00e0 ce qu&rsquo;elle ne coule pas soudainement \u00e0 un certain moment, mais progressivement pour que le flux devienne r\u00e9gulier et simultan\u00e9.<\/p>\n<p><strong>Interflux IF 9057 ATL<\/strong> est une p\u00e2te SAC305 &#8211; T4 avec fonction <strong>anti-tombstone<\/strong> int\u00e9gr\u00e9e. Il donne un r\u00e9sidu clair et minimal apr\u00e8s le soudage et est absolument sans halog\u00e8ne.<\/p>\n<h4>En savoir plus?<\/h4>\n<p>Laissez-nous vos coordonn\u00e9es via le <strong><a href=\"https:\/\/smans.com\/fr\/contact\/\">formulaire de contact<\/a><\/strong> et nous vous contacterons d\u00e8s que possible!<\/p>\n<p><em>&#8211; \u00c9crit par Bart van de Lisdonk<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tombstoning Un probl\u00e8me qui se produit pendant le processus de soudage par refusion, en particulier dans un syst\u00e8me de refusion en phase vapeur ou en phase gazeuse. Cela signifie que les composants passifs de la microplaque, tels que les r\u00e9sistances et les condensateurs, restent debout pendant le soudage. La cause de tombstoning La cause de&#8230;<\/p>\n","protected":false},"featured_media":4207,"template":"","tags":[],"case_category":[6214,6219,6217],"case_brand":[6212],"class_list":["post-4202","news","type-news","status-publish","has-post-thumbnail","hentry","case_category-assemblage-smt","case_category-impression-de-stencils","case_category-soudure","case_brand-asscon-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Comment \u00e9viter tombstoning pendant l&#039;assemblage des PCB - Smans<\/title>\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\/nl\/nieuws\/hoe-tombstoning-vermijden-tijdens-pcb-assemblage\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment \u00e9viter tombstoning pendant l&#039;assemblage des PCB - Smans\" \/>\n<meta property=\"og:description\" content=\"Tombstoning Un probl\u00e8me qui se produit pendant le processus de soudage par refusion, en particulier dans un syst\u00e8me de refusion en phase vapeur ou en phase gazeuse. 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