{"id":3159,"date":"2026-02-04T11:31:24","date_gmt":"2026-02-04T10:31:24","guid":{"rendered":"https:\/\/madtools.it\/foratura-profonda5xd-20xd-problematiche-tecniche-e-soluzioni\/"},"modified":"2026-02-05T17:10:24","modified_gmt":"2026-02-05T16:10:24","slug":"foratura-profonda5xd-20xd-problematiche-tecniche-e-soluzioni","status":"publish","type":"post","link":"https:\/\/madtools.it\/fr\/foratura-profonda5xd-20xd-problematiche-tecniche-e-soluzioni\/","title":{"rendered":"Per\u00e7age profond(5\u00d7D \u2013 20\u00d7D) : probl\u00e9matiques techniques et solutions"},"content":{"rendered":"\n<p><strong><em>Guide pratique des probl\u00e8mes r\u00e9els et de la mani\u00e8re de les r\u00e9soudre pour des diam\u00e8tres de \u00d81 \u00e0 \u00d825 mm<\/em><\/strong><\/p>\n\n\n\n<p>Le <strong><em><a href=\"https:\/\/madtools.it\/fr\/produits\/foratura-e-alesatura\/\">per\u00e7age profond<\/a><\/em><\/strong> avec un rapport profondeur\/diam\u00e8tre compris entre 5 et 20 est l\u2019une des op\u00e9rations d\u2019usinage les plus critiques.<br>Dans cette plage, l\u2019\u00e9vacuation des copeaux, la temp\u00e9rature, la stabilit\u00e9 du trou et la dur\u00e9e de vie de l\u2019outil deviennent des variables difficiles \u00e0 ma\u00eetriser.<\/p>\n\n\n\n<p><strong>1. Bourrage des copeaux et rupture de l\u2019outil<\/strong><\/p>\n\n\n\n<p>Lorsque les copeaux ne sont pas \u00e9vacu\u00e9s en continu, ils s\u2019accumulent devant l\u2019ar\u00eate de coupe, provoquant :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Augmentation du couple de coupe<\/li>\n\n\n\n<li>Surchauffe localis\u00e9e<\/li>\n\n\n\n<li>Rupture soudaine du foret<\/li>\n<\/ul>\n\n\n\n<p>Le probl\u00e8me est critique avec les mat\u00e9riaux produisant des copeaux longs (aciers inoxydables aust\u00e9nitiques, titane).<br>Les copeaux s\u2019enroulent et se bloquent dans le canal d\u2019\u00e9vacuation.<\/p>\n\n\n\n<p><strong>2. Contr\u00f4le thermique insuffisant<\/strong><\/p>\n\n\n\n<p>Le fluide de coupe doit atteindre l\u2019ar\u00eate de coupe en profondeur avec une pression suffisante pour refroidir et \u00e9vacuer les copeaux.<br>Si la pression est trop faible ou si le canal est mal con\u00e7u, la temp\u00e9rature augmente rapidement, compromettant la qualit\u00e9 et la dur\u00e9e de vie de l\u2019outil.<\/p>\n\n\n\n<p><strong>3. D\u00e9viation axiale<\/strong><\/p>\n\n\n\n<p>Avec l\u2019augmentation de la profondeur, le trou tend \u00e0 d\u00e9vier de l\u2019axe th\u00e9orique en raison de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Forces de coupe d\u00e9s\u00e9quilibr\u00e9es<\/li>\n\n\n\n<li>Flexion de l\u2019outil<\/li>\n\n\n\n<li>Absence de guidage lat\u00e9ral<\/li>\n<\/ul>\n\n\n\n<p>R\u00e9sultat : trous d\u00e9vi\u00e9s, ovalis\u00e9s, hors tol\u00e9rances.<\/p>\n\n\n\n<p><strong>4. Rugosit\u00e9 irr\u00e9guli\u00e8re<\/strong><\/p>\n\n\n\n<p>Les vibrations, l\u2019accumulation de copeaux et l\u2019usure irr\u00e9guli\u00e8re de l\u2019ar\u00eate de coupe laissent des rayures et des zones \u00e0 rugosit\u00e9 variable sur la paroi du trou.<\/p>\n\n\n\n<p><strong>Solutions techniques<\/strong><\/p>\n\n\n\n<p><strong>1. G\u00e9om\u00e9trie de pointe adapt\u00e9e<\/strong><\/p>\n\n\n\n<p><strong>Gun drill (foret \u00e0 une l\u00e8vre)<\/strong> \u2013 solution id\u00e9ale pour \u00d81\u201325 mm avec des exigences \u00e9lev\u00e9es de qualit\u00e9 :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Une seule ar\u00eate de coupe avec canal interne pour le fluide de coupe<\/li>\n\n\n\n<li><strong>\u00c9vacuation des copeaux par canal en V<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>\u00c9l\u00e9ments g\u00e9om\u00e9triques critiques :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Angle de d\u00e9pouille : influence la formation du copeau et la temp\u00e9rature<\/li>\n\n\n\n<li>Brise-copeaux : d\u00e9termine si le copeau se fragmente ou reste long<\/li>\n\n\n\n<li>Canal d\u2019\u00e9vacuation : dimensionn\u00e9 en fonction du type de copeau<\/li>\n<\/ul>\n\n\n\n<p><strong>2. Syst\u00e8me de lubrification\/refroidissement dimensionn\u00e9<\/strong><\/p>\n\n\n\n<p><strong>Param\u00e8tres \u00e0 contr\u00f4ler :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pression : 20\u201380 bar selon le diam\u00e8tre et la profondeur (pour gun drill)<\/li>\n\n\n\n<li>Qualit\u00e9 du fluide :\n<ul class=\"wp-block-list\">\n<li>Concentration stable de l\u2019\u00e9mulsion<\/li>\n\n\n\n<li>Filtration efficace (les copeaux en suspension r\u00e9duisent la lubrification)<\/li>\n\n\n\n<li>Temp\u00e9rature contr\u00f4l\u00e9e<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>3. Param\u00e8tres de coupe optimis\u00e9s<\/strong><\/p>\n\n\n\n<p>La vitesse de coupe et l\u2019avance doivent \u00eatre calibr\u00e9es conjointement.<br>En per\u00e7age profond, il est pr\u00e9f\u00e9rable d\u2019adopter une approche conservatrice : un cycle plus long mais stable g\u00e9n\u00e8re moins de rebuts que des param\u00e8tres agressifs.<\/p>\n\n\n\n<p><strong>4. Rigidit\u00e9 du syst\u00e8me machine<\/strong><\/p>\n\n\n\n<p>Points de contr\u00f4le :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Concentricit\u00e9 de la broche<\/li>\n\n\n\n<li>Rigidit\u00e9 du porte-outil<\/li>\n\n\n\n<li>Alignement pi\u00e8ce\u2013broche<\/li>\n<\/ul>\n\n\n\n<p><strong>Surveillance :<\/strong> des variations de couple et des vibrations anormales indiquent des probl\u00e8mes en cours.<\/p>\n\n\n\n<p><strong>Cas pratique : \u00d83 mm \u00d7 24 mm sur titane Ti6Al4V<\/strong><\/p>\n\n\n\n<p><strong>Application<\/strong> : canaux traversants pour dispositifs m\u00e9dicaux<br><strong>Tol\u00e9rances<\/strong> : rectitude 0,05 mm, Ra &lt; 0,8 \u00b5m<\/p>\n\n\n\n<p><strong>Probl\u00e8mes :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>15 % de rebuts<\/li>\n\n\n\n<li>Ruptures toutes les 20\u201325 pi\u00e8ces<\/li>\n\n\n\n<li>Surface ray\u00e9e<\/li>\n<\/ul>\n\n\n\n<p><strong>Cause :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Foret standard avec canal sous-dimensionn\u00e9<\/li>\n\n\n\n<li>Pression du fluide insuffisante (30 bar)<\/li>\n<\/ul>\n\n\n\n<p><strong>Solution :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gun drill<\/li>\n\n\n\n<li>Canal en V optimis\u00e9 pour les copeaux de titane<\/li>\n\n\n\n<li>Rev\u00eatement + superfinition<\/li>\n\n\n\n<li>Pression du fluide : 70 bar<\/li>\n\n\n\n<li>Param\u00e8tres : Vc 18 m\/min, f 0,02 mm\/tr<\/li>\n<\/ul>\n\n\n\n<p><strong>R\u00e9sultats :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rebuts : 2 %<\/li>\n\n\n\n<li>Dur\u00e9e de vie outil : 180\u2013200 trous<\/li>\n\n\n\n<li>Rectitude : 0,03 mm<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Guide pratique des probl\u00e8mes r\u00e9els et de la mani\u00e8re de les r\u00e9soudre pour des diam\u00e8tres de \u00d81 \u00e0 \u00d825 mm Le per\u00e7age profond avec un rapport profondeur\/diam\u00e8tre compris entre 5 et 20 est l\u2019une des op\u00e9rations d\u2019usinage les plus critiques.Dans cette plage, l\u2019\u00e9vacuation des copeaux, la temp\u00e9rature, la stabilit\u00e9 du trou et la dur\u00e9e de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3154,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[25],"tags":[],"class_list":["post-3159","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classifiee"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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