<\/div>\n
Configurations<\/h2>
Les profilom\u00e8tres de laboratoire se composent de : une base de r\u00e9f\u00e9rence en granit de haute plan\u00e9it\u00e9, un bras de guidage motoris\u00e9 (course typique de 50 \u00e0 200 mm) \u00e0 codeur haute r\u00e9solution, un palpeur \u00e0 contact \u00e0 pointe diamant avec capteur de position verticale (inductif ou LVDT, avec une r\u00e9solution allant jusqu’\u00e0 0,1 nm sur les mod\u00e8les les plus \u00e9volu\u00e9s), un syst\u00e8me de positionnement de la pi\u00e8ce (croix de translation, table tournante) et un PC d\u00e9di\u00e9 dot\u00e9 d’un logiciel d’analyse avanc\u00e9. Il existe des mod\u00e8les combin\u00e9s qui int\u00e8grent dans le m\u00eame instrument la mesure de rugosit\u00e9 (cut-off normalis\u00e9s) et de profil (forme et ondulation). <\/p>
Capacit\u00e9s de mesure<\/h2>
Les performances typiques sont : r\u00e9solution verticale de 0,1 nm \u00e0 10 nm, exactitude verticale de \u00b11 \u00e0 5 nm, course verticale de 1 \u00e0 5 mm, course horizontale de 50 \u00e0 200 mm et exactitude horizontale de l’ordre de quelques \u00b5m. Les param\u00e8tres calculables sont tous ceux pr\u00e9vus par l’ISO 4287 (2D) et l’ISO 25178 (surfaciques 3D, avec balayage raster). Les fonctions avanc\u00e9es comprennent le filtrage multi-cut-off, l’analyse de la courbe d’Abbott-Firestone, le calcul des param\u00e8tres fonctionnels Rpk\/Rk\/Rvk, la mesure de p\u00e9riodicit\u00e9 et l’\u00e9valuation de profils particuliers (cr\u00e9maill\u00e8res, engrenages, filetages). <\/p>
Mesure de profil g\u00e9om\u00e9trique<\/h2>
Outre la rugosit\u00e9, les profilom\u00e8tres permettent la mesure du profil g\u00e9om\u00e9trique macroscopique : distances, angles, rayons, radius compensation, comparaison avec la CAO nominale, calcul de rectitude, de parall\u00e9lisme et de perpendicularit\u00e9 sur les courses mesur\u00e9es. Sur les mod\u00e8les les plus \u00e9volu\u00e9s, la combinaison rugosit\u00e9 + profil + ondulation en un seul balayage permet de caract\u00e9riser compl\u00e8tement une surface avec un seul montage. La motorisation permet d’enregistrer de longs profils sans intervention de l’op\u00e9rateur. <\/p>
Applications<\/h2>
Les profilom\u00e8tres de laboratoire sont utilis\u00e9s dans les laboratoires qualit\u00e9 haut de gamme : a\u00e9ronautique (aubes de turbine, arbres de rotor, composants structurels), automobile (cames, si\u00e8ges d’injecteurs, si\u00e8ges de soupapes, segments de piston, vilebrequins), optique (lentilles, miroirs, supports), microm\u00e9canique (roulements miniatures, MEMS) et m\u00e9dical (proth\u00e8ses articulaires, vis d’ost\u00e9osynth\u00e8se, instruments chirurgicaux). Ils sont en outre utilis\u00e9s dans la recherche et le d\u00e9veloppement de nouveaux proc\u00e9d\u00e9s d’usinage (rectification, rodage, brunissage, finition electropolish) et dans la caract\u00e9risation de rev\u00eatements fonctionnels. <\/p>
Normes et \u00e9talonnage<\/h2>
Les normes de r\u00e9f\u00e9rence sont l’ISO 4287, l’ISO 4288, l’ISO 12179, l’ISO 16610 et l’ISO 25178 (param\u00e8tres surfaciques 3D). Pour la mesure de profil s’appliquent \u00e9galement l’ISO 12781 (plan\u00e9it\u00e9) et l’ISO 12780 (rectitude). L’\u00e9talonnage p\u00e9riodique utilise des \u00e9talons certifi\u00e9s ISO 17025 : cales de rugosit\u00e9, profils sinuso\u00efdaux, sph\u00e8res de rayon connu pour la v\u00e9rification du palpeur, et cales \u00e9talon de haute pr\u00e9cision pour la v\u00e9rification de longueur. La salle de mesure doit \u00eatre thermostat\u00e9e (typiquement 20 \u00b0C \u00b10,5 \u00b0C) pour obtenir les meilleures performances m\u00e9trologiques. <\/p>
Crit\u00e8res de choix<\/h2>
Le choix du profilom\u00e8tre appropri\u00e9 prend en compte la plage verticale et horizontale n\u00e9cessaire, la r\u00e9solution requise (les surfaces \u00e0 finition optique exigent une r\u00e9solution subnanom\u00e9trique), la capacit\u00e9 de mesure combin\u00e9e rugosit\u00e9 + profil, la motorisation (manuelle, CNC), le logiciel d’analyse (fonctions 2D ou 3D) et l’int\u00e9gration aux syst\u00e8mes LIMS et CAO de l’entreprise. Pour les laboratoires d\u00e9di\u00e9s \u00e0 un seul produit, il convient de s’orienter vers des mod\u00e8les sp\u00e9cialis\u00e9s ; pour les laboratoires multi-applications, les mod\u00e8les modulaires sont pr\u00e9f\u00e9rables. <\/p>","protected":false},"excerpt":{"rendered":"
Stations de laboratoire pour la mesure combin\u00e9e de rugosit\u00e9 et de profil avec palpeur \u00e0 contact.<\/p>\n","protected":false},"author":157040980,"featured_media":0,"parent":26514,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"footnotes":""},"class_list":["post-23813","page","type-page","status-publish","hentry"],"yoast_head":"\n
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