{"id":24996,"date":"2026-11-04T18:13:24","date_gmt":"2026-11-04T10:13:24","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=24996"},"modified":"2026-11-04T18:13:24","modified_gmt":"2026-11-04T10:13:24","slug":"aluminum-extrusion-billet-quality","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/es\/aluminum-extrusion-billet-quality\/","title":{"rendered":"Calidad de palanquilla que se nota en el dado"},"content":{"rendered":"

Calidad de palanquilla que se nota en el dado<\/h1>\n\n\n\n

La mayor parte de lo que se le pide corregir a un taller de dados comienza en la palanquilla. La capa de segregaci\u00f3n, el contenido de gas, las inclusiones de \u00f3xido y el estado del Mg2Si llegan al dado antes de cortar la primera garganta, y cada uno tiene su firma: una veta que solo aparece tras el anodizado, una ampolla que solo aparece tras el envejecimiento, un agarrotamiento que ning\u00fan pulido elimina. Esta p\u00e1gina expone las propiedades de la palanquilla que la fuente considera decisivas, los valores que una fundici\u00f3n puede realmente mantener y lo que cada uno hace en la prensa.<\/p>\n\n\n\n

Por qu\u00e9 la calidad de la palanquilla es una variable de prensa y no un detalle de compra<\/h2>\n\n\n\n

La posici\u00f3n publicada es tajante: la calidad de la palanquilla es de suma importancia para la productividad, y el lugar donde se ve es la superficie de secciones grandes y delgadas. Una palanquilla limpia se extruye m\u00e1s r\u00e1pido y sale con mejor superficie, porque el mismo flujo de metal que produce la forma es tambi\u00e9n el que arrastra la capa superficial, las inclusiones y el gas hacia el producto. Mejorar la palanquilla es, por tanto, uno de los pocos cambios que elevan la velocidad y la calidad a la vez en lugar de sacrificar una por la otra.<\/p>\n\n\n\n

Las propiedades, los valores y el defecto que corresponde a cada una<\/h2>\n\n\n\n
Propiedad<\/th>Valor que da la fuente<\/th>Qu\u00e9 hace en la prensa<\/th><\/tr><\/thead>
Capa de segregaci\u00f3n inversa<\/td>120 a 150 µm con colada DC convencional; 50 µm o menos con colada hot top<\/td>Una piel rica en perit\u00e9ctico que fluye hacia la superficie y se manifiesta como veta tras el anodizado<\/td><\/tr>
Zona de piel (shell zone)<\/td>Hasta 15 mm de profundidad<\/td>Alimenta preferentemente las partes m\u00e1s anchas de la secci\u00f3n, dando una banda que se ataca y anodiza de forma distinta<\/td><\/tr>
Contenido de gas<\/td>Por debajo de 0,12 cm³ por 100 litros de aluminio, medido con un analizador Telegas<\/td>Porosidad por hidr\u00f3geno; ampollas que se abren durante el tratamiento de soluci\u00f3n, peor en 7xxx y en secciones delgadas<\/td><\/tr>
Inclusiones de \u00f3xido<\/td>Eliminadas con filtros cer\u00e1micos de tubo radiante en el canal<\/td>Inicio de agarrotamiento y de l\u00ednea de dado; la part\u00edcula dura que mella la entrada de la garganta<\/td><\/tr>
Estado del Mg2Si<\/td>Precipitados gruesos si la palanquilla enfr\u00eda lentamente desde la temperatura de homogeneizaci\u00f3n<\/td>Una capa subcut\u00e1nea d\u00e9bil que se cizalla en el dado; el hueco que deja inicia una grieta superficial<\/td><\/tr>
Completitud de la homogeneizaci\u00f3n<\/td>Fase de hierro totalmente esferoidizada, no parcialmente<\/td>Una esferoidizaci\u00f3n parcial basta para aumentar el agarrotamiento en condiciones que de otro modo pasar\u00edan<\/td><\/tr>
Control de la temperatura del ba\u00f1o<\/td>Dentro de m\u00e1s o menos 5 °C, con agitador de ba\u00f1o<\/td>Uniformidad de composici\u00f3n a lo largo de la barra, que decide si la \u00faltima palanquilla se comporta como la primera<\/td><\/tr>
Composici\u00f3n de la carga<\/td>50 a 60 por ciento de chatarra a\u00f1adida al lingote virgen<\/td>Los oligoelementos se acumulan; por encima de los l\u00edmites cambian la tensi\u00f3n de fluencia y el comportamiento superficial<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Valores publicados para la pr\u00e1ctica comercial de colada. Las cifras de segregaci\u00f3n corresponden a las dos rutas de colada indicadas; el l\u00edmite de gas es el punto de control que recomienda la fuente, no una especificaci\u00f3n universal.<\/em><\/p>\n\n\n\n

La capa de segregaci\u00f3n es un problema superficial con profundidad<\/h2>\n\n\n\n

Intervienen dos capas distintas y se comportan de forma diferente. La zona de segregaci\u00f3n superficial producida en los primeros instantes de solidificaci\u00f3n es poco profunda: unos 100 µm en una palanquilla buena de 180 mm, hasta aproximadamente 1 mm en una mala, y m\u00e1s donde hay juntas fr\u00edas o ampollas. Al ser poco profunda, el flujo normal de extrusi\u00f3n la mantiene fuera del producto en una palanquilla buena. La zona de piel es la otra, y llega hasta 15 mm de profundidad, por lo que no puede ignorarse: es lo bastante gruesa para ser alimentada hacia la superficie dondequiera que la secci\u00f3n sea ancha y el flujo hacia esa regi\u00f3n sea r\u00e1pido.<\/p>\n\n\n\n

La consecuencia pr\u00e1ctica es que las vetas de segregaci\u00f3n no son un problema del dado ni del anodizado. Son un problema de colada y de descascarillado, y la ruta hot top reduce la capa de segregaci\u00f3n inversa a menos de la mitad frente a la colada DC convencional. Un taller que compra palanquilla en lugar de colarla tiene una palanca aqu\u00ed: descascarillar la palanquilla o comprarla descascarillada.<\/p>\n\n\n\n

El gas es un problema de tratamiento t\u00e9rmico que empieza en el ba\u00f1o<\/h2>\n\n\n\n

El hidr\u00f3geno es el \u00fanico gas apreciablemente soluble en aluminio, y entra durante la fusi\u00f3n, la colada, la limpieza y el decapado. Precipita en las inclusiones y los l\u00edmites de grano como hidr\u00f3geno molecular, que no puede difundir hacia fuera, y se expande durante el tratamiento de soluci\u00f3n. Por eso una palanquilla que se extruye limpiamente puede a\u00fan producir ampollas tras el envejecimiento, y por eso el defecto es peor en secciones delgadas y en las aleaciones con mayor contenido de magnesio.<\/p>\n\n\n\n

La desgasificaci\u00f3n es, por tanto, una especificaci\u00f3n de palanquilla, no una cortes\u00eda de la fundici\u00f3n. El punto de control publicado est\u00e1 por debajo de 0,12 cm³ por 100 litros de aluminio, medido en el canal o distribuidor antes y despu\u00e9s del tratamiento del ba\u00f1o.<\/p>\n\n\n\n

Qu\u00e9 cambia esto para el dado<\/h2>\n\n\n\n

Tres de los defectos anteriores acaban atribuy\u00e9ndose al dado, y ninguno responde al acero de dado. Un agarrotamiento que sobrevive a un dado reci\u00e9n pulido y reci\u00e9n nitrurado suele deberse a inclusiones. Una l\u00ednea de dado que reaparece tras el pulido puede ser la mella dejada por una part\u00edcula dura en la entrada de la garganta. Y una superficie que se desgarra a una temperatura dentro de la ventana publicada suele ser una capa subcut\u00e1nea llena de Mg2Si grueso, que se cizalla antes que la matriz.<\/p>\n\n\n\n

Esa es tambi\u00e9n la raz\u00f3n por la que un acero m\u00e1s limpio no soluciona todo. Si el palanquilla entrega el defecto, cambiar el grado mueve el costo sin mover el perfil. La p\u00e1gina sobre pick-up y l\u00edneas de matriz expone c\u00f3mo distinguir esos casos en la prensa.<\/p>\n\n\n\n

Qu\u00e9 implica esto para un pedido de acero para hileras<\/h2>\n\n\n\n

Nada de esto reduce lo que la matriz tiene que soportar. Lo soporta mejor cuando el palanquilla est\u00e1 limpio, y el acero todav\u00eda tiene que mantener la dureza en el cojinete y tomar una capa nitrurada. El programa 1.2344 ESR para utillaje de extrusi\u00f3n est\u00e1 en el p\u00e1gina de suministro de extrusi\u00f3n 1.2344 ESR H13<\/a>, el grado en la p\u00e1gina del acero para herramientas H13<\/a>, y la capa en la p\u00e1gina de nitruraci\u00f3n de acero para herramientas<\/a>. Los defectos que explica esta p\u00e1gina se describen en la prensa en el p\u00e1gina de l\u00edneas de arrastre y del troquel<\/a>, la ventana de temperatura en el p\u00e1gina de temperatura de extrusi\u00f3n<\/a>, y el cojinete que recibe el da\u00f1o en el p\u00e1gina de longitud de apoyo de hilera<\/a>.<\/p>\n\n\n\n

Antes de escribir esto en una especificaci\u00f3n de palanquilla<\/h3>\n\n\n\n

Estos son valores publicados de la pr\u00e1ctica comercial, y varios son puntos de control m\u00e1s que l\u00edmites de aceptaci\u00f3n. La cifra de gas, las profundidades de segregaci\u00f3n y la relaci\u00f3n de carga dependen todas de la ruta de colada, la aleaci\u00f3n y la fundici\u00f3n. \u00daselos para hacer la pregunta correcta a un proveedor de palanquilla, y confirme los l\u00edmites reales contra el certificado entregado y la primera pieza.<\/p>\n\n\n\n

Fuente, Extrusion of Aluminium Alloys, T. Sheppard, Kluwer Academic Publishers, 1999, secciones 6.4, 6.7 y 7.9.2.<\/p>","protected":false},"excerpt":{"rendered":"

Billet Quality That Shows Up at the Die Most of what a die shop is asked to fix starts in the billet. The segregation layer, the gas content, the oxide inclusions and the state of the Mg2Si all arrive at the die before the first bearing is cut, and each of them has a signature: […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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Quality That Shows Up at the Die Most of what a die shop is asked to fix starts in the billet. The segregation layer, the gas content, the oxide inclusions and the state of the Mg2Si all arrive at the die before the first bearing is cut, and each of them has a signature:…","rttpg_featured_image_url":null,"rttpg_author":{"display_name":"Evan","author_link":"https:\/\/aobosteel.com\/es\/blog\/author\/admin\/"},"rttpg_comment":0,"rttpg_category":null,"rttpg_excerpt":"Billet Quality That Shows Up at the Die Most of what a die shop is asked to fix starts in the billet. 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