{"id":5068,"date":"2020-09-25T06:52:48","date_gmt":"2020-09-25T06:52:48","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5068"},"modified":"2020-09-25T06:52:48","modified_gmt":"2020-09-25T06:52:48","slug":"aluminum-pinholes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/aluminum-pinholes\/","title":{"rendered":"Agujeros de aluminio"},"content":{"rendered":"<p><strong>La causa principal de los poros en el aluminio:<\/strong><\/p>\n<p>Cuanto mayor sea la temperatura de fundici\u00f3n, mayor ser\u00e1 la cantidad de hidr\u00f3geno que el metal fundido absorber\u00e1 del aire h\u00famedo. La principal fuente de hidr\u00f3geno es la descomposici\u00f3n del vapor de agua a la alta temperatura del aluminio fundido. La solubilidad del hidr\u00f3geno en el aluminio fundido aumenta a medida que sube la temperatura, pero la solubilidad en el aluminio s\u00f3lido es muy baja. Por lo tanto, durante el proceso de solidificaci\u00f3n, los poros formados por la precipitaci\u00f3n de hidr\u00f3geno guardan una mayor relaci\u00f3n con la temperatura de fusi\u00f3n de la aleaci\u00f3n y el tiempo de fusi\u00f3n. Si el control no es adecuado en la fase final de la fusi\u00f3n \u2014por ejemplo, si el calentamiento es demasiado r\u00e1pido o la temperatura demasiado alta\u2014, la cantidad de hidr\u00f3geno absorbida por el aluminio l\u00edquido ser\u00e1 elevada, el hidr\u00f3geno se difundir\u00e1 m\u00e1s ampliamente en el aluminio l\u00edquido y la probabilidad de que se formen poros ser\u00e1 mayor. Hay menos poros cerca de la superficie exterior debido a un enfriamiento m\u00e1s r\u00e1pido. Seg\u00fan algunos datos, a 700 \u2103, la solubilidad del hidr\u00f3geno en 100 g de aluminio es de 0,5\uff5e0,9 cm\u00b3. Cuando la temperatura alcanza los 850 \u2103, la solubilidad del hidr\u00f3geno se multiplica por 2 o por 3. Por lo tanto, la fusi\u00f3n debe mantenerse por debajo de los 750 \u00b0C, y se recomienda una fusi\u00f3n r\u00e1pida, aunque debe controlarse el problema de un aumento demasiado r\u00e1pido de la temperatura en la fase final del calentamiento.<\/p>\n<p><strong>An\u00e1lisis operativo <\/strong><\/p>\n<p>\u2460La carga no est\u00e1 limpia y el tiempo de horneado de la carga trasera es corto.<\/p>\n<p>\u2461 Dise\u00f1o deficiente del sistema de vertido.<\/p>\n<p>\u2462Una temperatura de colada elevada y una operaci\u00f3n de colada inadecuada provocar\u00e1n la entrada de gas y escoria.<\/p>\n<p>\u2463 El agente refinador est\u00e1 h\u00famedo y el tiempo de reposo tras el tratamiento de deterioro es insuficiente.<\/p>\n<p>\u2464El precalentamiento de la carga es insuficiente y se realiza de forma descuidada.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5139\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Pinholes-1.jpg\" alt=\"Agujeros de aluminio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Pinholes-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Pinholes-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Medidas para el tratamiento de los poros en el aluminio<\/strong><\/p>\n<p>Proceso de fusi\u00f3n<\/p>\n<p>\u2460 Modifica la proporci\u00f3n entre material nuevo y material reciclado: 30% de material reciclado y 70% de material nuevo.<\/p>\n<p>\u2461Mejorar el proceso de fundici\u00f3n y eliminar el \u00f3xido, el limo y otras impurezas de la superficie de la carga antes de su uso, para evitar la entrada de humedad y aceite.<\/p>\n<p>\u2462Para obtener piezas de fundici\u00f3n de aluminio sin poros o con menos poros, el precalentamiento de la carga es la etapa clave. La temperatura de precalentamiento es de 350 a 450 \u2103 y se mantiene durante m\u00e1s de 3 h. Si el tiempo de precalentamiento de la carga es corto, seguir\u00e1 habiendo un peque\u00f1o n\u00famero de poros peque\u00f1os y difusos en la secci\u00f3n de la pieza fundida.<\/p>\n<p>El secado y el precalentamiento del agente de refinado presentan grandes ventajas. Tras el refinado y antes del vertido, se debe dejar reposar la aleaci\u00f3n l\u00edquida durante un cierto tiempo, con el fin de eliminar las inclusiones de oxidaci\u00f3n y el hidr\u00f3geno del aluminio l\u00edquido. Si el agente de refinado est\u00e1 h\u00famedo, tambi\u00e9n aportar\u00e1 una gran cantidad de hidr\u00f3geno. En el caso de los hornos que hayan sido sometidos a una revisi\u00f3n general o que no se hayan utilizado durante mucho tiempo, es imprescindible someterlos a un proceso de secado completo; de lo contrario, la humedad presente en el material refractario se evaporar\u00e1 y crear\u00e1 una atm\u00f3sfera h\u00fameda, lo que provocar\u00e1 la formaci\u00f3n de poros durante la fundici\u00f3n.<\/p>\n<p>Para eliminar los poros en las piezas fundidas de aleaci\u00f3n de aluminio, el crisol utilizado para la fundici\u00f3n puede emplearse como cuchara de colada. Cuando el crisol alcanza la temperatura de colada tras el refinado y la metamorfosis, se levanta manualmente y se vierte directamente para evitar la entrada de aire que se producir\u00eda al invertir la cuchara. Las herramientas utilizadas deben limpiarse antes de su uso y, a continuaci\u00f3n, recubrirse con capas protectoras, precalentarse y secarse para evitar un precalentamiento deficiente y la adsorci\u00f3n de humedad en la superficie, lo que generar\u00eda una gran cantidad de gas durante el proceso de fundici\u00f3n y vertido, provocando poros en las piezas fundidas.<\/p>\n<p>Adem\u00e1s, utilice un agente de recubrimiento especial para cubrir el crisol durante el proceso de fusi\u00f3n. Se selecciona el agente de desgasificaci\u00f3n, refinado y modificaci\u00f3n, y la cantidad a\u00f1adida es de 0,61 TP3T del peso del aluminio fundido. Debe secarse antes de su uso. Cuando la temperatura del l\u00edquido de la aleaci\u00f3n alcance los 720 \u2103, utilice una campana de acero inoxidable para presionar el agente de desgasificaci\u00f3n y refinado contra el fondo del crisol y mu\u00e9vala a velocidad constante a lo largo de la pared interior del crisol, evitando que entre cualquier tipo de impureza en el crisol.<\/p>","protected":false},"excerpt":{"rendered":"<p>The main reason for aluminum pinholes: The higher the smelting temperature, the more serious the molten metal will absorb hydrogen from the humid air. The&hellip;<\/p>","protected":false},"author":1,"featured_media":5139,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5068","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aluminum Pinholes Treatment Measures in Casting Process<\/title>\n<meta name=\"description\" content=\"Aluminum Pinholes Treatment Measures: use a special covering agent to cover during the melting process. 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