boquilla de fundici\u00f3n<\/a> est\u00e1n en contacto, y las inclusiones, como la escoria de aluminio, generadas durante los procesos de fundici\u00f3n y laminaci\u00f3n, se acumulan en la punta exterior de la boquilla. Cuando el aluminio l\u00edquido pasa por all\u00ed, las condiciones de cristalizaci\u00f3n en ese punto son diferentes a las de otros lugares. Existen diferencias evidentes en las condiciones de cristalizaci\u00f3n. En la superficie de la bobina fundida y laminada se forma una diferencia estructural evidente debido a las distintas condiciones de cristalizaci\u00f3n. Si esta diferencia es grave, se producir\u00e1n defectos en la varilla de limpieza. Si es leve, aparecer\u00e1n rayas verticales.<\/p>\nUna vez generadas las rayas longitudinales, estas se imprimen en la misma posici\u00f3n del rollo y van formando poco a poco una peque\u00f1a tira de aluminio adhesiva y irregular a lo largo de la circunferencia del rollo. Debido a la interacci\u00f3n entre el rollo y la bobina laminada en caliente, resulta dif\u00edcil eliminar las rayas longitudinales en l\u00ednea. A veces se extienden a lo largo de toda la longitud.<\/p>\n
Tras ajustar otros par\u00e1metros del proceso, se aument\u00f3 en 0,1 mm la separaci\u00f3n entre la boquilla y el rodillo.<\/p>\n
La prueba demuestra que pr\u00e1cticamente no hay estr\u00edas en la superficie del lingote laminado por fundici\u00f3n, que las estr\u00edas longitudinales se han controlado adecuadamente y que la calidad de la superficie del lingote ha mejorado considerablemente. Sin embargo, cuando la separaci\u00f3n entre los rodillos de la boquilla es demasiado grande, la pel\u00edcula de \u00f3xido situada en dicho espacio se rompe con facilidad y se arrastra hasta la superficie de la plancha, formando defectos de pliegues en la pel\u00edcula de \u00f3xido. En casos graves, la pel\u00edcula de \u00f3xido se rompe y provoca fugas de aluminio, por lo que hay que tener cuidado al aumentar la separaci\u00f3n entre los rodillos de la boquilla.<\/p>\n
Las caracter\u00edsticas superficiales de las rayas longitudinales son defectos que se extienden a lo largo de toda la longitud de la chapa laminada en caliente. Las rayas longitudinales son bandas brillantes, a veces profundas. La raya longitudinal formar\u00e1 una raya correspondiente en direcci\u00f3n circunferencial en la superficie del rodillo de colada, que debe pulirse con papel de lija durante la producci\u00f3n. Las rayas longitudinales no pueden eliminarse de la superficie de la l\u00e1mina. Cuando las rayas longitudinales son muy marcadas, aparecen rayas claras y oscuras en la superficie de la l\u00e1mina, lo que afecta gravemente a la calidad de la superficie y a la calidad del producto.<\/p>\n
Al aumentar la distancia entre el rodillo de laminaci\u00f3n y la boquilla de colada, y al optimizar el patr\u00f3n de flujo de la boquilla, se reducen o eliminan las rayas longitudinales de la superficie de la chapa laminada en caliente.<\/p>","protected":false},"excerpt":{"rendered":"
The size of the gap in nozzle and roller has a great influence on the longitudinal streaks. In normal production, due to the assembly error…<\/p>","protected":false},"author":1,"featured_media":9525,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-9524","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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