{"id":4985,"date":"2020-09-24T06:36:46","date_gmt":"2020-09-24T06:36:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4985"},"modified":"2020-09-24T06:43:12","modified_gmt":"2020-09-24T06:43:12","slug":"bright-bars","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/bright-bars\/","title":{"rendered":"Barres lumineuses"},"content":{"rendered":"

Les barres claires sont principalement dues \u00e0 des impuret\u00e9s m\u00e9talliques et non m\u00e9talliques introduites dans la buse et qui sont rest\u00e9es \u00e0 l'avant de celle-ci pendant la phase de formation de la plaque verticale, ou au cours du processus de production en raison de la basse temp\u00e9rature de la caisse de t\u00eate, du faible niveau de liquide dans la goulotte, et \u00e0 la faible vitesse d'\u00e9coulement des scories, l'aluminium fondu se solidifie au niveau du bord avant de la buse, provoquant un blocage local qui entrave l'\u00e9coulement normal de l'aluminium fondu.<\/p>\n

D\u00e8s qu\u2019une bande brillante appara\u00eet \u00e0 un endroit quelconque au cours du processus de coul\u00e9e-laminage, elle persiste jusqu\u2019\u00e0 la fin de celui-ci, sans interruption interm\u00e9diaire, et sa position reste fixe. Il n\u2019est pas difficile de rep\u00e9rer les bandes brillantes caus\u00e9es par un blocage pendant la production ; des stries sym\u00e9triques apparaissent alors sur les faces sup\u00e9rieure et inf\u00e9rieure de la bande. La formation de bandes brillantes et de stries de s\u00e9gr\u00e9gation \u00e0 la surface de la plaque est exactement le contraire. En effet, l\u2019aluminium liquide \u00e9tant bloqu\u00e9 et solidifi\u00e9 \u00e0 l\u2019avant de la buse, ce qui entrave l\u2019\u00e9coulement normal de la masse fondue, celle-ci entre finalement en contact avec les rouleaux de part et d\u2019autre et ne peut pas former les grains \u00e9quiaxes fins \u00e0 la surface. Apr\u00e8s une attaque \u00e0 l\u2019acide \u00e0 haute concentration, on constate que les grains locaux sont align\u00e9s. Ce type de d\u00e9faut de stries ne peut pas \u00eatre \u00e9limin\u00e9 lors du traitement ult\u00e9rieur par laminage \u00e0 froid. Cela ne peut \u00eatre r\u00e9alis\u00e9 qu\u2019en augmentant la temp\u00e9rature de la caisse avant et le niveau de liquide dans la goulotte au stade initial de la formation des stries. Des mesures telles que l\u2019ajustement de la vitesse de laminage peuvent permettre de rem\u00e9dier \u00e0 ce blocage.<\/p>\n

\"\"<\/p>\n

Mesures th\u00e9rapeutiques \u00ab Bright Bars \u00bb<\/strong><\/p>\n

(1) Le bo\u00eetier avant et le buse de coul\u00e9e<\/a> La plaque de ventilation doit \u00eatre parfaitement s\u00e8che avant utilisation. La buse moul\u00e9e doit \u00eatre plac\u00e9e dans un four pendant 30 minutes ou chauff\u00e9e \u00e0 150 \u00b0C pendant plus d'une heure avant d'\u00eatre rang\u00e9e sur l'\u00e9tag\u00e8re. Avant la d\u00e9charge, utilisez le pistolet de pulv\u00e9risation de gaz liqu\u00e9fi\u00e9 (gaz naturel) pour la cuire pendant environ 1 minute afin d\u2019\u00e9viter que la buse n\u2019explose et ne provoque un colmatage.<\/p>\n

(2) R\u00e9gler la temp\u00e9rature de la bo\u00eete d'alimentation, le niveau de liquide dans la goulotte ainsi que la hauteur du niveau de liquide dans la bo\u00eete d'alimentation, et ajuster la vitesse de la bande de coul\u00e9e et de laminage. Si des stries apparaissent lorsque la temp\u00e9rature de la caisse de t\u00eate est basse, il convient d\u2019abord d\u2019augmenter cette temp\u00e9rature, puis d\u2019ajuster la vitesse de la bande de coul\u00e9e et de laminage, et enfin de r\u00e9gler le niveau de liquide.<\/p>\n

(3) Prendre des mesures de filtrage, choisir des filtre en mousse c\u00e9ramique<\/a> (selon diff\u00e9rentes techniques d'alliage), et d'\u00e9liminer les inclusions solides en suspension dans la masse fondue.<\/p>\n

(4) Nettoyer le bac avant et la base, le tuyau d'alimentation, la goulotte, etc. lorsque la machine est \u00e0 l'arr\u00eat, afin d'\u00e9viter que des impuret\u00e9s m\u00e9talliques et non m\u00e9talliques ne soient entra\u00een\u00e9es dans la buse de coul\u00e9e lors de la mise en place de la brique.<\/p>\n

(5) Veiller \u00e0 la puret\u00e9 du gaz de raffinage. Si l'aluminium fondu s'av\u00e8re visqueux, basculer \u00e0 temps sur la source de gaz de secours afin d'\u00e9viter de compromettre la qualit\u00e9 de la masse fondue.<\/p>","protected":false},"excerpt":{"rendered":"

The bright bars are mainly caused by metal and non-metal impurities brought into the nozzle and stayed in the front of the nozzle during the…<\/p>","protected":false},"author":1,"featured_media":5036,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4985","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nBright Bars Treatment Measures by Controlling Aluminum Liquid<\/title>\n<meta name=\"description\" content=\"The bright bars are mainly caused by metal and non-metal impurities brought into the nozzle and stayed in the front of the nozzle.\" \/>\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\/bright-bars\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" 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