{"id":17299,"date":"2024-03-21T11:43:27","date_gmt":"2024-03-21T03:43:27","guid":{"rendered":"https:\/\/firstmold.com\/?post_type=case-study&#038;p=17299"},"modified":"2026-04-24T13:38:10","modified_gmt":"2026-04-24T05:38:10","slug":"steel-ventilated-heat-sink-cnc-machining","status":"publish","type":"case-study","link":"https:\/\/firstmold.com\/fr\/case-study\/steel-ventilated-heat-sink-cnc-machining\/","title":{"rendered":"Fabrication de dissipateurs thermiques ventil\u00e9s en acier"},"content":{"rendered":"<p id=\"h-\">Un dissipateur thermique est un composant utilis\u00e9 pour la gestion thermique. Il emp\u00eache les composants g\u00e9n\u00e9rateurs de chaleur d'une machine de surchauffer. Les dissipateurs thermiques les plus performants peuvent \u00eatre fabriqu\u00e9s \u00e0 partir de cuivre, d'aluminium et d'acier.<\/p>\n\n\n\n<p>L'usinage de dissipateurs thermiques en acier ventil\u00e9 consiste \u00e0 perforer la t\u00f4le d'acier pour permettre \u00e0 l'air de circuler \u00e0 travers le m\u00e9tal, am\u00e9liorant ainsi le transfert de chaleur par convection. Les dissipateurs thermiques en acier inoxydable sont principalement utilis\u00e9s dans des environnements exigeants, notamment :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>Environnements \u00e0 haute temp\u00e9rature<\/em><\/strong> - L'acier inoxydable supporte mieux les temp\u00e9ratures \u00e9lev\u00e9es que l'aluminium sans compromettre l'int\u00e9grit\u00e9 structurelle.<\/li>\n\n\n\n<li><strong><em>Environnements avec des mat\u00e9riaux corrosifs<\/em><\/strong> - Lorsque les produits chimiques ou l'humidit\u00e9 d'un environnement peuvent endommager l'aluminium, l'acier inoxydable peut \u00eatre utilis\u00e9 comme alternative.<\/li>\n\n\n\n<li><strong><em>\u00c9lectronique de puissance industrielle<\/em><\/strong> - Le dissipateur thermique en acier inoxydable est utilis\u00e9 dans les applications de haute puissance telles que les briques DC-DC, les contr\u00f4leurs de moteur et les soudeuses \u00e9lectriques, qui chauffent pendant le fonctionnement.<\/li>\n\n\n\n<li><strong><em>R\u00f4le structurel<\/em><\/strong> - Le dissipateur thermique en acier inoxydable peut \u00e9galement jouer le double r\u00f4le de refroidisseur et de composant structurel du bo\u00eetier.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-client-requirements\">Exigences du client<\/h2>\n\n\n\n<p>Un fabricant de dissipateurs thermiques a contact\u00e9 First Mold pour le prototypage rapide de dissipateurs thermiques. Le client a pr\u00e9cis\u00e9 que le mat\u00e9riau utilis\u00e9 pour le projet \u00e9tait l'acier, car il \u00e9tait cens\u00e9 jouer un r\u00f4le structurel, en plus du refroidissement.<\/p>\n\n\n\n<p>Lors de la premi\u00e8re discussion sur le plan du projet, le client a expliqu\u00e9 que la tol\u00e9rance du prototypage du dissipateur thermique ne devait pas d\u00e9passer 0,01 mm. Selon lui, il s'agissait d'un projet pour une application de haute performance.<\/p>\n\n\n\n<p>\u201cLa tol\u00e9rance \u00e9lev\u00e9e est n\u00e9cessaire pour obtenir une efficacit\u00e9 thermique maximale, des performances constantes d'un lot \u00e0 l'autre et un montage structurel fiable\u201d, a expliqu\u00e9 le client.<\/p>\n\n\n\n<p>Apr\u00e8s les discussions, le chef de projet de First Mold, Bowen Huang, a fait visiter l'usine au client pour lui pr\u00e9senter certaines des machines de pointe, le rassurant sur la capacit\u00e9 de First Mold \u00e0 g\u00e9rer efficacement le projet.<\/p>\n\n\n\n<p>\u201cNous disposons de certaines des machines CNC \u00e0 5 axes les plus avanc\u00e9es de l'industrie pour le prototypage rapide\u201d, a d\u00e9clar\u00e9 M. Huang. \u201cNotre \u00e9quipe d'ing\u00e9nieurs a plus de cent ans d'exp\u00e9rience collective dans l'usinage CNC. C'est toujours un plaisir de participer \u00e0 des projets qui nous permettent de mettre en valeur notre riche exp\u00e9rience.\u201d<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-challenges-and-solutions\">D\u00e9fis et solutions<\/h2>\n\n\n\n<p>L'usinage des dissipateurs thermiques en acier pr\u00e9sente des d\u00e9fis uniques, principalement en raison de la nature du mat\u00e9riau. L'acier a une mauvaise conductivit\u00e9 thermique et un taux d'\u00e9crouissage \u00e9lev\u00e9, ce qui le rend plus difficile \u00e0 usiner. Voici quelques-uns des principaux d\u00e9fis pos\u00e9s par la fabrication de dissipateurs thermiques en acier :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>Usure excessive de l'outil :<\/em><\/strong> L'acier est abrasif et dur, ce qui acc\u00e9l\u00e8re l'usure de l'outil. Une usure excessive de l'outil augmente le co\u00fbt de l'outil et les temps d'arr\u00eat entre les changements d'outils. Cela peut allonger la dur\u00e9e de l'usinage.<\/li>\n\n\n\n<li><strong><em>Les vibrations peuvent affecter la stabilit\u00e9 structurelle :<\/em><\/strong> La force de coupe \u00e9lev\u00e9e peut entra\u00eener des vibrations, ce qui peut conduire \u00e0 la d\u00e9formation de structures fines et d\u00e9licates et \u00e0 un mauvais \u00e9tat de surface.<\/li>\n\n\n\n<li><strong><em>D\u00e9formation due \u00e0 une forte contrainte thermique :<\/em><\/strong> L'acier retient la chaleur au lieu de la dissiper pendant la coupe. Si elle n'est pas correctement refroidie, cette concentration de chaleur peut entra\u00eener une d\u00e9formation de la pi\u00e8ce.<\/li>\n\n\n\n<li><strong><em>Difficult\u00e9s de gestion des puces :<\/em><\/strong> L'usinage de l'acier produit d'importants volumes de copeaux chauds. S'ils ne sont pas correctement contr\u00f4l\u00e9s, ces copeaux peuvent endommager les outils et conduire \u00e0 un mauvais \u00e9tat de surface.<\/li>\n<\/ul>\n\n\n\n<p>Pour r\u00e9ussir l'usinage des dissipateurs thermiques en acier, les ing\u00e9nieurs de First Mold ont d\u00fb trouver des moyens de surmonter ces d\u00e9fis uniques.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-overcoming-work-hardening-and-low-thermal-conductivity-of-steel\">Surmonter l'\u00e9crouissage et la faible conductivit\u00e9 thermique de l'acier<\/h3>\n\n\n\n<p>La t\u00e9nacit\u00e9 et la r\u00e9sistance \u00e9lev\u00e9es de l'acier n\u00e9cessitent une force de coupe \u00e9lev\u00e9e pour l'usinage. Cependant, l'augmentation de la force de coupe peut entra\u00eener des vibrations. Outre les vibrations, la surface peut se durcir rapidement pendant la coupe, ce qui rend les coupes suivantes plus difficiles. L'usure de l'outil de coupe peut alors \u00eatre plus rapide.<\/p>\n\n\n\n<p>La faible conductivit\u00e9 thermique de l'acier signifie \u00e9galement que lors de la fabrication du dissipateur thermique par usinage CNC, la chaleur g\u00e9n\u00e9r\u00e9e \u00e0 la surface de coupe n'est pas dissip\u00e9e ou emport\u00e9e par les copeaux. Elle se concentre autour de la pointe de l'outil de coupe, acc\u00e9l\u00e9rant son usure et sa d\u00e9faillance.<\/p>\n\n\n\n<p>La machine CNC \u00e0 5 axes utilis\u00e9e par First Mold est sp\u00e9cialement \u00e9quip\u00e9e de quatre syst\u00e8mes de refroidissement \u00e0 buse qui projettent du liquide de refroidissement \u00e0 haute pression (plus de 1 000 psi) sur la surface de coupe. Ces syst\u00e8mes de refroidissement sont non seulement efficaces pour dissiper la chaleur g\u00e9n\u00e9r\u00e9e par la pointe de coupe, mais ils cassent et \u00e9liminent \u00e9galement les copeaux pour \u00e9viter la d\u00e9formation de la surface du prototype de dissipateur thermique.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-machining-curved-steel-heat-sink-prototype-surface\">Usinage de la surface d'un prototype de dissipateur thermique en acier courb\u00e9<\/h3>\n\n\n\n<p>Le plan du dissipateur thermique incurv\u00e9 du client posait un probl\u00e8me d'usinage particulier. Les surfaces planes permettent des parcours d'outils simples, mais une surface courbe n\u00e9cessite des parcours d'outils sp\u00e9ciaux. Les principaux d\u00e9fis de l'usinage de l'acier incurv\u00e9 sont les suivants :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>Programmation complexe de la FAO :<\/em><\/strong> La fabrication de dissipateurs thermiques \u00e0 partir d'acier courb\u00e9 n\u00e9cessite l'utilisation d'un logiciel sophistiqu\u00e9 pour contr\u00f4ler l'orientation de l'outil et les vitesses d'avance le long des contours changeants.<\/li>\n\n\n\n<li><strong><em>Le besoin d'une machine multi-axes :<\/em><\/strong> Les surfaces courbes n\u00e9cessitent des passes de finition complexes, multi-mouvements et pr\u00e9cises. La machine CNC \u00e0 5 axes de First Mold permet d'\u00e9liminer le repositionnement manuel constant de la pi\u00e8ce, qui peut entra\u00eener des erreurs.<\/li>\n<\/ul>\n\n\n\n<p>L'\u00e9quipe d'ing\u00e9nieurs de First Mold a utilis\u00e9 le fraisage trocho\u00efdal, une strat\u00e9gie dans laquelle la machine CNC \u00e0 grande vitesse utilise un parcours d'outil circulaire et en spirale pour d\u00e9couper les fentes. En maintenant un engagement radial et une profondeur axiale \u00e9lev\u00e9e, ce mouvement r\u00e9duit les forces de coupe, la chaleur et les vibrations. Cela permet un enl\u00e8vement de mati\u00e8re plus rapide et une dur\u00e9e de vie plus longue de l'outil. Cette technique permet \u00e9galement d'acc\u00e9l\u00e9rer le temps de prototypage des dissipateurs thermiques.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-optimizing-heat-sink-machining-efficiency\">Optimisation de l'efficacit\u00e9 de l'usinage des dissipateurs thermiques<\/h3>\n\n\n\n<p>La combinaison d'une grande t\u00e9nacit\u00e9 du mat\u00e9riau, d'une faible vitesse et d'un outillage sp\u00e9cialis\u00e9 rend le processus d'usinage de l'acier lent et fastidieux.<\/p>\n\n\n\n<p>Pour pallier ces insuffisances, l'\u00e9quipe d'ing\u00e9nieurs de First Mold a mis en \u0153uvre les principes de la conception pour la fabrication (DFM). Par exemple, nous avons utilis\u00e9 des outils rev\u00eatus \u00e0 haute r\u00e9sistance \u00e0 la chaleur et des angles de coupe positifs pour r\u00e9duire les forces de coupe.<\/p>\n\n\n\n<p>L'\u00e9paisseur des ailettes a \u00e9t\u00e9 l\u00e9g\u00e8rement augment\u00e9e et leur profondeur a \u00e9t\u00e9 limit\u00e9e afin d'am\u00e9liorer la rigidit\u00e9 pendant l'usinage. L'\u00e9quipe a \u00e9galement d\u00e9ploy\u00e9 des parcours d'outils sp\u00e9cialis\u00e9s dans la programmation FAO et utilis\u00e9 des machines rigides pour minimiser les vibrations et les distorsions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-importance-of-maintaining-0-01mm-tolerance-for-the-heat-sink-manufacturing-project\">L'importance du maintien d'une tol\u00e9rance de 0,01 mm pour le projet de fabrication de dissipateurs thermiques<\/h2>\n\n\n\n<p>Lors de l'usinage du dissipateur thermique, les ing\u00e9nieurs de First Mold ont accord\u00e9 une attention particuli\u00e8re \u00e0 la programmation FAO afin de respecter la tol\u00e9rance de 0,01 mm. L'obtention de la tol\u00e9rance souhait\u00e9e \u00e9tait cruciale pour plusieurs raisons, notamment :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>Montage de pr\u00e9cision :<\/em><\/strong> L'obtention de la bonne pr\u00e9cision permet un alignement parfait entre les vis et les trous sur les surfaces de montage. Cela permet d'\u00e9viter les contraintes structurelles sur les composants.<\/li>\n\n\n\n<li><strong><em>Am\u00e9liorer l'int\u00e9grit\u00e9 structurelle :<\/em><\/strong> Une tol\u00e9rance de 0,01 mm permet au prototype de dissipateur thermique de servir \u00e9galement de support structurel. Gr\u00e2ce \u00e0 sa r\u00e9sistance, l'acier peut \u00eatre utilis\u00e9 dans des environnements \u00e0 haute pression, \u00e0 haute temp\u00e9rature et \u00e0 fortes vibrations sans nuire aux performances thermiques.<\/li>\n\n\n\n<li><strong><em>Des performances constantes d'un lot \u00e0 l'autre :<\/em><\/strong> Pour la fabrication de dissipateurs thermiques en grande s\u00e9rie, le maintien d'une tol\u00e9rance de 0,01 mm garantit des performances identiques pour chaque produit. Ce point est crucial pour les industries sp\u00e9cialis\u00e9es telles que l'imagerie m\u00e9dicale et l'a\u00e9rospatiale.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-the-client-gained-with-first-mold-s-solutions\">Ce que le client a gagn\u00e9 avec les solutions de First Mold<\/h2>\n\n\n\n<p>Le prototype de dissipateur thermique en acier a \u00e9t\u00e9 livr\u00e9 une semaine avant la date pr\u00e9vue, ce que le client a beaucoup appr\u00e9ci\u00e9. En utilisant une technique d'usinage innovante, First Mold a \u00e9t\u00e9 en mesure d'usiner le prototype \u00e0 un budget sup\u00e9rieur au devis fourni par d'autres machinistes que le client avait rencontr\u00e9s auparavant.<\/p>\n\n\n\n<p>\u201cNous avons mod\u00e9r\u00e9 nos attentes en mati\u00e8re de d\u00e9lais sur la base de nos exp\u00e9riences pr\u00e9c\u00e9dentes\u201d, a d\u00e9clar\u00e9 le client, apr\u00e8s avoir v\u00e9rifi\u00e9 l'exactitude du prototype de dissipateur thermique par rapport au plan. \u201cNous ne nous attendions pas \u00e0 recevoir le prototype avant une semaine\u201d.<\/p>\n\n\n\n<p>En s'associant \u00e0 First Mold, le client s'est assur\u00e9 les services d'un fournisseur de confiance qui l'aidera \u00e0 s'adapter \u00e0 la demande lorsque le besoin s'en fera sentir. \u201cNous nous engageons toujours \u00e0 donner la priorit\u00e9 \u00e0 la r\u00e9ussite et au bonheur de nos clients\u201d, a d\u00e9clar\u00e9 M. Huang. &nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faq\">FAQ<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1777008805567\"><strong class=\"schema-faq-question\">Quels sont les principaux d\u00e9fis pos\u00e9s par les dissipateurs thermiques en acier usin\u00e9s par CNC ?<\/strong> <p class=\"schema-faq-answer\">L'acier est un mat\u00e9riau dur qui n\u00e9cessite une force d'usinage plus importante. Cependant, l'augmentation de la force peut entra\u00eener une usure et une rupture rapides de l'outil, ainsi qu'une augmentation des vibrations et de la d\u00e9formation des pi\u00e8ces fines et d\u00e9licates.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1777009079276\"><strong class=\"schema-faq-question\">Quels sont les meilleurs moyens d'accro\u00eetre l'efficacit\u00e9 de la fabrication des dissipateurs thermiques en acier ?<\/strong> <p class=\"schema-faq-answer\">Parmi les moyens d'am\u00e9liorer l'efficacit\u00e9 de l'usinage des dissipateurs thermiques en acier, citons l'utilisation d'outils en carbure ou rev\u00eatus \u00e0 haute r\u00e9sistance \u00e0 la chaleur. Il convient \u00e9galement d'ajouter des syst\u00e8mes de refroidissement \u00e0 haute pression dans le processus de fabrication et d'optimiser le parcours de l'outil.<\/p> <\/div> <\/div>\n\n\n\n<p>Ce client a tellement soutenu nos efforts de promotion qu'il a sugg\u00e9r\u00e9 que nous montrions une vid\u00e9o du processus de fraisage CNC de la pi\u00e8ce.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<figure class=\"wp-block-video aligncenter\"><video height=\"1334\" style=\"aspect-ratio: 750 \/ 1334;\" width=\"750\" controls src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/Radiator-5-axis-CNC-machining-process.mp4\"><\/video><figcaption class=\"wp-element-caption\">Radiateur Processus d'usinage CNC \u00e0 5 axes<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Ce cas montre le processus d'usinage CNC 5 axes d'un dissipateur thermique ventil\u00e9 en acier chez FirstMold.<\/p>","protected":false},"author":2,"featured_media":17302,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"case-study-category":[80],"case-study-tag":[78],"class_list":["post-17299","case-study","type-case-study","status-publish","has-post-thumbnail","hentry","case-study-category-cnc-machining-cases","case-study-tag-tools-and-equipment"],"acf":{"photo_gallery":{"case_study_gallery":[[{"id":17301,"title":"5 axis CNC machined appliance radiator","caption":"5 axis CNC machined appliance 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