{"id":4989,"date":"2020-09-24T06:27:36","date_gmt":"2020-09-24T06:27:36","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4989"},"modified":"2020-09-24T06:27:36","modified_gmt":"2020-09-24T06:27:36","slug":"fine-stripes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/fine-stripes\/","title":{"rendered":"Rayures fines"},"content":{"rendered":"

La largeur des fines stries \u00e0 la surface est g\u00e9n\u00e9ralement inf\u00e9rieure \u00e0 1 mm et leur profondeur inf\u00e9rieure \u00e0 0,2 mm, mais elles peuvent s'\u00e9tendre sur des centaines de m\u00e8tres dans le sens longitudinal de la t\u00f4le ; m\u00eame \u00e0 l'issue du processus de production, jusqu'\u00e0 l'arr\u00eat de la ligne, ces fines stries restent clairement visibles apr\u00e8s le d\u00e9capage. Certaines de ces fines stries sont dues \u00e0 des traces de rouleaux r\u00e9siduelles ; elles disparaissent g\u00e9n\u00e9ralement apr\u00e8s le d\u00e9capage. Un simple essai de traction permet de mettre en \u00e9vidence le d\u00e9faut et provoque un r\u00e9tr\u00e9cissement au niveau de la zone affect\u00e9e, ce qui prouve que ce type de d\u00e9faut est d\u00fb \u00e0 la pr\u00e9sence d\u2019impuret\u00e9s qui entravent l\u2019\u00e9coulement du m\u00e9tal en fusion.<\/p>\n

Deux raisons pouvant entra\u00eener un blocage du d\u00e9bit<\/strong><\/p>\n

(1) La pi\u00e8ce moul\u00e9e pr\u00e9sente localement des particules d'impuret\u00e9s cavit\u00e9 de la buse<\/a>. Lorsque l'on inspecte la buse de coul\u00e9e une fois le coulage et le laminage arr\u00eat\u00e9s, on constate que des r\u00e9sidus se sont accumul\u00e9s sur la face inf\u00e9rieure de la buse. Au microscope \u00e9lectronique, on peut distinguer la pr\u00e9sence de particules de titane, de bore et d'oxydes dans cette zone.<\/p>\n

(2) La buse de coul\u00e9e est en contact avec le rouleau. Au d\u00e9but de la coul\u00e9e verticale, en raison de la faible temp\u00e9rature de surface du rouleau et de la pr\u00e9sence de lubrifiant \u00e0 base de graphite sur sa surface, lorsque l\u2019aluminium liquide est soumis \u00e0 une pression statique pendant le processus de coul\u00e9e verticale des scories, il s\u2019\u00e9coule depuis la bo\u00eete avant, passe par le canal transversal et p\u00e9n\u00e8tre dans la buse de coul\u00e9e pour former le jet de coul\u00e9e. La temp\u00e9rature augmente rapidement ; sous l\u2019effet de la chaleur, la buse de coul\u00e9e commence \u00e0 se dilater et \u00e0 se d\u00e9former, puis entre en contact avec le rouleau. Le graphite (carbone) pr\u00e9sent \u00e0 la surface du rouleau s\u2019accumule sur le rebord de la buse. Au fur et \u00e0 mesure que la production se poursuit, la couche d\u2019oxyde s\u2019accumule et s\u2019\u00e9paissit, et certaines particules s\u2019agglom\u00e8rent en petits morceaux. Ces particules, au contact du rouleau, d\u00e9truisent la couche d\u2019oxyde d\u2019origine pr\u00e9sente \u00e0 la surface de ce dernier. Une fois que l\u2019aluminium en fusion s\u2019\u00e9coule de la buse de coul\u00e9e et entre en contact avec le rouleau, la masse fondue se solidifie, adh\u00e8re \u00e0 la surface du rouleau et se d\u00e9place de mani\u00e8re synchrone avec celui-ci, sans glissement relatif. La tension est utilis\u00e9e pour s\u00e9parer la bande du rouleau, et il arrive parfois que de petites particules d\u2019aluminium collantes soient \u00e0 peine visibles au niveau des rayures. Les fines stries \u00e0 la surface traversent la buse de coul\u00e9e afin de garantir un certain \u00e9cart entre celle-ci et le rouleau, et de r\u00e9duire la quantit\u00e9 de graphite projet\u00e9e. La plupart des traces pr\u00e9sentes sur la surface du rouleau peuvent \u00eatre \u00e9limin\u00e9es \u00e0 l\u2019aide d\u2019une toile \u00e9meri.<\/p>\n

\"Rayures<\/p>\n

Mesures de traitement des rayures fines<\/strong><\/p>\n

(1) Contr\u00f4ler la vitesse d'ajout du fil de titane (la vitesse d'ajout du fil de titane est d'environ 10 \u00e0 12 m\/tonne par heure en fonction du d\u00e9bit d'aluminium), le point d'ajout (\u00e0 la sortie du four de d\u00e9gazage) et la temp\u00e9rature de la masse fondue (la temp\u00e9rature de la masse fondue doit \u00eatre sup\u00e9rieure \u00e0 710 \u2103), Faire en sorte que la teneur en titane se diffuse rapidement et uniform\u00e9ment dans la masse fondue afin d\u2019\u00e9viter toute pr\u00e9cipitation.<\/p>\n

(2) R\u00e9gler l'\u00e9cart entre la buse de coul\u00e9e et le rouleau lors de la mise en place de la plaque. Il s'av\u00e8re que le contact entre la buse de coul\u00e9e et le rouleau doit \u00eatre ajust\u00e9 en temps voulu afin d'\u00e9viter la formation de fines bandes \u00e0 la surface du rouleau.<\/p>\n

(3) Assurez-vous que la couche de graphite \u00e0 la surface du rouleau est uniforme et pas trop \u00e9paisse, puis essuyez d\u00e9licatement la surface du rouleau avec un chiffon en coton.<\/p>","protected":false},"excerpt":{"rendered":"

The width of the fine stripes on the surface is generally less than 1mm and the depth is less than 0.2mm, but it can extend…<\/p>","protected":false},"author":1,"featured_media":5030,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4989","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nFine Stripes Treatment Measures in Casting and Rolling Process<\/title>\n<meta name=\"description\" content=\"The width of the fine stripes on the surface is generally less than 1mm and the depth is less than 0.2mm, but it can extend...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/fine-stripes\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta 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