{"id":4989,"date":"2020-09-24T06:27:36","date_gmt":"2020-09-24T06:27:36","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4989"},"modified":"2020-09-24T06:27:36","modified_gmt":"2020-09-24T06:27:36","slug":"fine-stripes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/fine-stripes\/","title":{"rendered":"Rayas finas"},"content":{"rendered":"

La anchura de las finas rayas de la superficie suele ser inferior a 1 mm y la profundidad, inferior a 0,2 mm, pero pueden extenderse a lo largo de cientos de metros en la direcci\u00f3n longitudinal de la chapa; incluso tras todo el proceso de producci\u00f3n, hasta el cierre de la planta, las finas rayas siguen siendo claramente visibles tras el decapado. Algunas de estas rayas finas se deben a marcas residuales de los rodillos, y suelen desaparecer tras el decapado. Un sencillo ensayo de tracci\u00f3n puede poner de manifiesto el defecto y provocar un estrechamiento cerca de la zona defectuosa, lo que demuestra que la causa de este tipo de defecto es la presencia de impurezas que dificultan el flujo del metal fundido.<\/p>\n

Dos razones por las que se bloquea el flujo<\/strong><\/p>\n

(1) Hay part\u00edculas de impurezas en algunas zonas de la pieza fundida cavidad de la boquilla<\/a>. Al inspeccionar la boquilla de fundici\u00f3n una vez detenidos los procesos de fundici\u00f3n y laminaci\u00f3n, se observa que se han acumulado algunos residuos en la superficie inferior de la misma. Mediante el microscopio electr\u00f3nico, se puede apreciar que en esta zona hay part\u00edculas de titanio y boro, as\u00ed como \u00f3xidos.<\/p>\n

(2) La boquilla de colada est\u00e1 en contacto con el rodillo. Al inicio de la placa vertical, debido a la baja temperatura superficial del rodillo y al lubricante de grafito presente en la superficie, cuando el aluminio l\u00edquido se encuentra bajo presi\u00f3n est\u00e1tica durante el proceso de paso de la escoria por la placa vertical, fluye desde la caja delantera a trav\u00e9s del canal transversal hacia la boquilla de colada, formando as\u00ed la boquilla de colada. La temperatura aumenta r\u00e1pidamente; la boquilla de colada comienza a expandirse y deformarse al calentarse, y entra en contacto con el rodillo. El grafito (carbono) presente en la superficie del rodillo se acumula en el borde. A medida que avanza la producci\u00f3n, el \u00f3xido se acumula y se espesa, y parte de \u00e9l se agrupa en peque\u00f1os fragmentos. Estas part\u00edculas, al entrar en contacto con el rodillo, destruyen la capa de \u00f3xido original de la superficie del rodillo. Una vez que el aluminio l\u00edquido sale de la boquilla de colada y entra en contacto con el rodillo, la masa fundida se solidifica, se adhiere a la superficie del rodillo y se desplaza de forma sincronizada con este, sin deslizamiento relativo. La tensi\u00f3n se utiliza para separar la banda del rodillo y, en ocasiones, se pueden ver ligeramente peque\u00f1as part\u00edculas de aluminio pegajoso en los ara\u00f1azos. Las finas rayas de la superficie se deben a que el material pasa a trav\u00e9s de la boquilla de colada para garantizar un cierto espacio entre esta y el rodillo, y reducir la cantidad de grafito pulverizado. La mayor\u00eda de las marcas en la superficie del rodillo pueden eliminarse utilizando lija.<\/p>\n

\"Rayas<\/p>\n

Medidas para el tratamiento de las estr\u00edas finas<\/strong><\/p>\n

(1) Controlar la velocidad de adici\u00f3n del alambre de titanio (la velocidad de adici\u00f3n del alambre de titanio es de aproximadamente 10-12 m\/ton por hora, en funci\u00f3n del caudal de aluminio), la posici\u00f3n de adici\u00f3n (en la salida del horno de desgasificaci\u00f3n) y la temperatura de la masa fundida (la temperatura de la masa fundida es superior a 710 \u2103), Haga que el contenido de titanio se difunda de forma r\u00e1pida y uniforme en la masa fundida para evitar la precipitaci\u00f3n.<\/p>\n

(2) Ajustar la distancia entre la boquilla de colada y el rodillo al colocar la plancha. Se ha comprobado que el contacto entre la boquilla de colada y el rodillo debe ajustarse a tiempo para evitar la formaci\u00f3n de finas tiras en la superficie del rodillo.<\/p>\n

(3) Aseg\u00farate de que la capa de grafito de la superficie del rodillo sea uniforme y no demasiado gruesa, y limpia con cuidado la superficie del rodillo con un pa\u00f1o de algod\u00f3n.<\/p>","protected":false},"excerpt":{"rendered":"

The width of the fine stripes on the surface is generally less than 1mm and the depth is less than 0.2mm, but it can extend…<\/p>","protected":false},"author":1,"featured_media":5030,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4989","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nFine Stripes Treatment Measures in Casting and Rolling Process<\/title>\n<meta name=\"description\" content=\"The width of the fine stripes on the surface is generally less than 1mm and the depth is less than 0.2mm, but it can extend...\" \/>\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\/fine-stripes\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta 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