{"id":4826,"date":"2020-09-17T02:09:39","date_gmt":"2020-09-17T02:09:39","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4826"},"modified":"2020-09-17T02:09:39","modified_gmt":"2020-09-17T02:09:39","slug":"grain-refinement-process","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/grain-refinement-process\/","title":{"rendered":"Proc\u00e9d\u00e9 d'affinage du grain"},"content":{"rendered":"

Le proc\u00e9d\u00e9 d\u2019affinage du grain est largement utilis\u00e9 dans la coul\u00e9e semi-continue. Ce proc\u00e9d\u00e9 se pr\u00eatant bien \u00e0 l\u2019utilisation d\u2019un dispositif d\u2019alimentation en fil d\u2019affinage, il est possible d\u2019ajuster de mani\u00e8re appropri\u00e9e la direction d\u2019injection de l\u2019agent d\u2019affinage et la vitesse d\u2019injection du fil d\u2019affinage afin de garantir un effet d\u2019affinage optimal. De plus, lors du processus de fabrication de l\u2019agent d\u2019affinage, les grains de ce dernier ont \u00e9t\u00e9 affin\u00e9s, ce qui optimise l\u2019effet d\u2019affinage de la brame issue de la coul\u00e9e semi-continue. Pour l\u2019ajout de l\u2019agent d\u2019affinage, le dispositif d\u2019alimentation utilis\u00e9 peut \u00eatre contr\u00f4l\u00e9 en ligne gr\u00e2ce au syst\u00e8me de commande automatique du processus de coul\u00e9e, de sorte que la vitesse et la quantit\u00e9 d\u2019 raffineur de c\u00e9r\u00e9ales<\/a> correspondre au processus de coul\u00e9e r\u00e9el et am\u00e9liorer encore l'effet d'affinage du grain. La vitesse de coul\u00e9e est acc\u00e9l\u00e9r\u00e9e, la vitesse d'alimentation de l'affineur de grain est augment\u00e9e en cons\u00e9quence, et le rapport entre la quantit\u00e9 d'affineur de grain ajout\u00e9e et la quantit\u00e9 d'aluminium liquide reste constant, ce qui permet de maintenir la stabilit\u00e9 de l'effet d'affinage du grain.<\/p>\n

Lorsque l'agent d'affinage des grains est ajout\u00e9 \u00e0 l'aluminium fondu, il d\u00e9truit le film d'oxyde \u00e0 la surface de celui-ci, ce qui fait que certaines inclusions d'oxyde p\u00e9n\u00e8trent dans l'aluminium fondu, entra\u00eenant ainsi une augmentation de la teneur en inclusions de ce dernier. De plus, l\u2019aluminium fondu sera expos\u00e9 \u00e0 l\u2019air, ce qui augmentera son absorption d\u2019air et, par cons\u00e9quent, sa teneur en hydrog\u00e8ne. C\u2019est pourquoi le processus d\u2019affinage du grain doit \u00eatre effectu\u00e9 avant la syst\u00e8me de d\u00e9gazage en ligne<\/a> et Syst\u00e8me de filtrage CFF<\/a>, une fois le processus d'affinage du grain termin\u00e9, l'aluminium fondu passe par le dispositif d'\u00e9limination de l'hydrog\u00e8ne et le dispositif de filtration ; les inclusions d'hydrog\u00e8ne et d'oxyde sont ainsi \u00e9limin\u00e9es de l'aluminium fondu, qui est ainsi purifi\u00e9.<\/p>\n

\"Proc\u00e9d\u00e9<\/p>\n

\u00c9tant donn\u00e9 que le point de fusion du titane, qui intervient dans le dispositif d'affinage granulaire, est tr\u00e8s \u00e9lev\u00e9, bien que le fondant pr\u00e9sent dans ce dispositif puisse am\u00e9liorer le processus de fusion du titane, une partie de celui-ci reste sous forme de particules. Si le dispositif d'affinage granulaire est trop proche du filtre en mousse c\u00e9ramique<\/a>, le titane non fondu va retenir les particules de titane qu'il contient, ce qui r\u00e9duit l'effet d'affinage du grain. Par cons\u00e9quent, l'affineur de grain doit \u00eatre plac\u00e9 aussi loin que possible du filtre c\u00e9ramique afin de favoriser la fusion du titane et d'am\u00e9liorer l'effet d'affinage du grain.<\/p>","protected":false},"excerpt":{"rendered":"

Grain refinement process is widely used in semi-continuous casting. Because the grain refinement process is convenient to use a refined wire feeder, the adding direction…<\/p>","protected":false},"author":1,"featured_media":4833,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4692],"class_list":["post-4826","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-grain-refinement-process"],"yoast_head":"\nGrain Refinement Process used in Semi-continuous Casting<\/title>\n<meta name=\"description\" content=\"Grain refinement process is widely used in semi-continuous casting. 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