{"id":1183,"date":"2020-04-17T06:32:11","date_gmt":"2020-04-17T06:32:11","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=1183"},"modified":"2020-08-28T05:47:46","modified_gmt":"2020-08-28T05:47:46","slug":"molten-aluminum-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/molten-aluminum-casting\/","title":{"rendered":"Fundici\u00f3n de aluminio fundido"},"content":{"rendered":"

La fundici\u00f3n y el vertido de aleaciones de aluminio son las etapas principales en la producci\u00f3n de piezas de fundici\u00f3n de aluminio fundido. El control riguroso de todo el proceso de fundici\u00f3n y vertido desempe\u00f1a un papel importante en la prevenci\u00f3n de defectos en las piezas de fundici\u00f3n de aluminio fundido. Dado que el aluminio fundido tiene una gran tendencia a absorber hidr\u00f3geno, su capacidad de oxidaci\u00f3n es elevada. Es necesario tomar precauciones durante el proceso de fundici\u00f3n y colada del aluminio fundido para obtener piezas de fundici\u00f3n de alta calidad.<\/p>\n

Control de materias primas<\/h2>\n

Para obtener una fundici\u00f3n de aluminio de alta calidad, en primer lugar deben seleccionarse materias primas adecuadas. Las materias primas deben gestionarse de forma cient\u00edfica y manipularse correctamente. De lo contrario, la calidad de la aleaci\u00f3n se ver\u00e1 gravemente afectada. La carga debe someterse a un chorro de arena antes de su uso para eliminar el \u00f3xido superficial, la grasa y otros contaminantes. Todas las cargas deben precalentarse antes de introducirse en el horno para eliminar la humedad adherida a la superficie y acortar el tiempo de fusi\u00f3n a m\u00e1s de 3 horas.<\/p>\n

\"\"<\/p>\n

Preparaci\u00f3n de piezas de fundici\u00f3n \u00abHot Top\u00bb<\/h2>\n

Tanto los crisoles nuevos como los viejos que no se hayan utilizado durante mucho tiempo deben someterse a un chorro de arena antes de su uso y calentarse a una temperatura de entre 700 y 800 grados durante 2 a 4 horas. Para eliminar el agua y las sustancias combustibles adheridas a la pared interior del crisol, una vez que se haya enfriado por debajo de los 300 grados, limpie con cuidado la pared interior del crisol y aplique la pintura cuando la temperatura no sea inferior a 200 grados.<\/p>\n

Piezas de fundici\u00f3n en caliente<\/a> Debe precalentarse antes de su uso y recubrirse con pintura protectora a una temperatura de entre 150 y 200 grados, y secarse completamente. Tras su uso, deben eliminarse por completo los \u00f3xidos y fluoruros adheridos a la superficie.<\/p>\n

\"Copa
Copa de colada de titanato de aluminio<\/figcaption><\/figure>\n

Control de la temperatura de fusi\u00f3n<\/h2>\n

La temperatura de fusi\u00f3n es demasiado baja, lo que no favorece la disoluci\u00f3n de los elementos de aleaci\u00f3n ni la expulsi\u00f3n de gases e inclusiones. Adem\u00e1s, debido al calor insuficiente del canal de alimentaci\u00f3n, no es posible compensar adecuadamente las piezas de fundici\u00f3n de aluminio fundido. Una temperatura de fundici\u00f3n excesiva no solo supone un desperdicio de energ\u00eda, sino que es a\u00fan m\u00e1s grave porque, cuanto mayor es la temperatura, mayor es la absorci\u00f3n de hidr\u00f3geno, m\u00e1s gruesos son los granos cristalinos y m\u00e1s grave es la oxidaci\u00f3n del aluminio.<\/p>\n

Tiempo de fusi\u00f3n<\/h2>\n

Para reducir la oxidaci\u00f3n y la captaci\u00f3n de impurezas del aluminio fundido, se debe acortar al m\u00e1ximo el tiempo de permanencia del aluminio fundido en el horno y la fundici\u00f3n debe realizarse r\u00e1pidamente. Desde el inicio de la fusi\u00f3n hasta la finalizaci\u00f3n de la colada, el proceso de fundici\u00f3n en arena de aluminio fundido no debe superar las 4 horas, el de fundici\u00f3n en metal no debe superar las 6 horas y el de fundici\u00f3n a presi\u00f3n no debe superar las 8 horas.<\/p>\n

Transferencia de aluminio fundido<\/h2>\n

Aunque la densidad de la al\u00famina s\u00f3lida es similar a la del aluminio fundido, una vez introducida en este, tardar\u00e1 un tiempo considerable en hundirse hasta el fondo del crisol. La pel\u00edcula de \u00f3xido de aluminio que se forma tras la oxidaci\u00f3n del aluminio fundido es densa \u00fanicamente en la cara en contacto con el aluminio fundido, mientras que la cara en contacto con el aire es porosa y presenta un gran n\u00famero de peque\u00f1os poros con un di\u00e1metro de 60\u2013100 A. Tiene una gran superficie espec\u00edfica y una fuerte capacidad de adsorci\u00f3n. Se adsorbe f\u00e1cilmente al vapor de agua y tiende a flotar.<\/p>\n

Por lo tanto, la diferencia entre la densidad de esta pel\u00edcula de \u00f3xido y la del aluminio fundido es peque\u00f1a, por lo que se mezcla con el metal fundido; su velocidad de flotaci\u00f3n es muy lenta, resulta dif\u00edcil separarla del metal fundido y la formaci\u00f3n de poros en la pieza fundida de aluminio es excesiva debido a esta mezcla. Por lo tanto, la clave para el trasvase del aluminio fundido es minimizar la agitaci\u00f3n del metal fundido y reducir al m\u00ednimo el contacto entre el fundido y el aire.<\/p>\n

Vertido de aluminio fundido<\/h2>\n

Cuando se utilice el crisol basculante para transferir el material fundido, con el fin de evitar que este se mezcle con el aire, la cuchara debe colocarse lo m\u00e1s cerca posible de la boquilla del horno y en \u00e1ngulo. Haga que el material fundido fluya hacia abajo por la pared lateral de la cuchara, para que no impacte directamente contra el fondo de la misma, lo que provocar\u00eda agitaci\u00f3n y salpicaduras.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum alloy smelting and pouring are the main links in molten aluminum casting production. The strict control of the entire process of melting and pouring…<\/p>","protected":false},"author":1,"featured_media":1578,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[37],"class_list":["post-1183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-molten-aluminum-casting"],"yoast_head":"\nMolten Aluminum Casting | Foundry Aluminum Casting<\/title>\n<meta name=\"description\" content=\"The strict control of the entire process of melting and pouring plays an important role in molten aluminum casting defects.\" \/>\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\/es\/molten-aluminum-casting\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" 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