{"id":4987,"date":"2020-09-24T06:16:58","date_gmt":"2020-09-24T06:16:58","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4987"},"modified":"2020-09-24T06:16:58","modified_gmt":"2020-09-24T06:16:58","slug":"airway-streaks","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/airway-streaks\/","title":{"rendered":"Tra\u00een\u00e9es dans les voies respiratoires"},"content":{"rendered":"

Les stries dans le canal de coul\u00e9e sont principalement dues \u00e0 une teneur en hydrog\u00e8ne trop \u00e9lev\u00e9e dans la masse fondue et \u00e0 l'obstruction de la cavit\u00e9 de la buse par des corps \u00e9trangers. La buse de coul\u00e9e est relativement humide, la masse fondue reste trop longtemps dans le four de fusion ou le four de repos, ou encore la temp\u00e9rature de l'aluminium liquide est trop \u00e9lev\u00e9e, ce qui entra\u00eene une augmentation de la teneur en hydrog\u00e8ne. Au cours du processus de laminage, le gaz pr\u00e9sent dans la cavit\u00e9 de liquide destin\u00e9e au laminage ne se disperse pas facilement dans la bande solide ; la billette reste en permanence en suspension dans la cavit\u00e9 de liquide. Au fil du temps, le gaz accumul\u00e9 forme de plus en plus de petites bulles. L\u00e0 o\u00f9 se trouvent des bulles, l'\u00e9coulement du m\u00e9tal en fusion est entrav\u00e9 et l'alimentation continue en m\u00e9tal en fusion est perturb\u00e9e, ce qui entra\u00eene l'apparition d'un canal blanc \u00e0 la surface de la bande.<\/p>\n

De plus, si des impuret\u00e9s m\u00e9talliques ou non m\u00e9talliques restent dans la cavit\u00e9 de la buse pendant le processus de fabrication de la plaque verticale, cela provoquera un colmatage partiel et cr\u00e9era une zone de basse pression. Le gaz (principalement de l\u2019hydrog\u00e8ne) s\u2019y concentrera et formera progressivement un c\u00f4ne de gaz, entravant ainsi l\u2019\u00e9coulement normal de l\u2019aluminium en fusion. \u00c0 ce stade, il convient d\u2019augmenter la vitesse de la bande et d\u2019\u00e9lever de mani\u00e8re appropri\u00e9e la temp\u00e9rature du caisson avant ainsi que le niveau de liquide. Sous l\u2019effet de la pression statique, de longs pores se formeront de part et d\u2019autre de la bande et se d\u00e9placeront. Lorsque les deux \u201c canaux d\u2019air \u201d se rapprochent, une force d\u2019attraction semble s\u2019exercer entre eux, les amenant \u00e0 se rapprocher progressivement jusqu\u2019\u00e0 fusionner en un seul, formant ainsi un triangle d\u2019air au point de confluence et r\u00e9v\u00e9lant un trou \u00e0 la surface ; il est \u00e9galement possible de coller du ruban de papier et une t\u00f4le d\u2019acier \u00e0 l\u2019emplacement correspondant de la bande sur le rouleau, puis de faire tourner ce dernier. Dans la zone biphasique, la coque dure superficielle qui forme le c\u00f4ne de gaz se brise, le gaz est lib\u00e9r\u00e9 et les bandes formant les canaux d\u2019air disparaissent progressivement.<\/p>\n

\"Tra\u00een\u00e9es<\/p>\n

Mesures th\u00e9rapeutiques en cas de stries dans les voies respiratoires<\/strong><\/p>\n

(1) La t\u00f4le de goulotte peut \u00eatre pos\u00e9e et utilis\u00e9e une fois compl\u00e8tement s\u00e8che, ce qui r\u00e9duit le temps de pr\u00e9paration du panneau vertical afin d'\u00e9viter toute absorption d'humidit\u00e9.<\/p>\n

(2) R\u00e9duire le temps de s\u00e9jour du m\u00e9tal en fusion dans le four de fusion et le four de repos ; un affinage suppl\u00e9mentaire doit \u00eatre effectu\u00e9 si ce temps d\u00e9passe 4 heures. Lorsque la temp\u00e9rature est trop \u00e9lev\u00e9e ou que l'aluminium fondu reste plus de 8 heures, il est modifi\u00e9 et soumis \u00e0 une nouvelle pulv\u00e9risation d'affinage afin de r\u00e9duire la teneur en hydrog\u00e8ne du m\u00e9tal fondu.<\/p>\n

(3) Prendre filtre en mousse c\u00e9ramique<\/a> des mesures de filtration visant \u00e0 \u00e9liminer les particules solides en suspension dans la masse fondue.<\/p>\n

(4) Nettoyer le bo\u00eetier avant et le socle, le tuyau d'alimentation, ainsi que syst\u00e8me de goulottes de transfert de m\u00e9tal<\/a> une fois la machine arr\u00eat\u00e9e, afin d'\u00e9viter que des impuret\u00e9s m\u00e9talliques et non m\u00e9talliques ne soient introduites dans le buse de coul\u00e9e<\/a> lors de la mise en place de la dalle.<\/p>\n

(5) Veiller \u00e0 la puret\u00e9, \u00e0 la pression et au d\u00e9bit du gaz purifi\u00e9 afin d'\u00e9viter toute alt\u00e9ration de la qualit\u00e9 de la masse fondue.<\/p>","protected":false},"excerpt":{"rendered":"

Airway streaks are mainly caused by too high melt hydrogen content and blocking of foreign objects in the nozzle cavity. The casting nozzle is relatively…<\/p>","protected":false},"author":1,"featured_media":5028,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4987","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAirway Streaks Treatment by Degassing and Filtering<\/title>\n<meta name=\"description\" content=\"Airway streaks are mainly caused by too high melt hydrogen content and blocking of foreign objects in the nozzle cavity. 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