{"id":12314,"date":"2022-01-18T06:15:17","date_gmt":"2022-01-18T06:15:17","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=12314"},"modified":"2022-01-18T06:15:17","modified_gmt":"2022-01-18T06:15:17","slug":"online-degassing-unit","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/online-degassing-unit\/","title":{"rendered":"Unidade de desgaseifica\u00e7\u00e3o online"},"content":{"rendered":"

A unidade de desgaseifica\u00e7\u00e3o online geralmente inclui duas partes: um dispositivo de desgaseifica\u00e7\u00e3o e um dispositivo de aquecimento. O dispositivo de desgaseifica\u00e7\u00e3o utiliza um rotor de grafite para transportar N\u2082 para o interior do alum\u00ednio fundido na caixa de desgaseifica\u00e7\u00e3o, a fim de remover o H\u2082 contido no alum\u00ednio fundido. Em seguida, a velocidade do rotor de grafite \u00e9 controlada pelo ajuste da velocidade do motor de passo. O dispositivo de aquecimento geralmente utiliza um elemento de aquecimento el\u00e9trico para gerar calor e manter a temperatura do alum\u00ednio fundido dentro da faixa exigida. Especialmente quando a temperatura do alum\u00ednio fundido est\u00e1 muito baixa, ela \u00e9 elevada. A eleva\u00e7\u00e3o e o abaixamento da caixa de desgaseifica\u00e7\u00e3o s\u00e3o realizados por meio de uma estrutura mec\u00e2nica de eleva\u00e7\u00e3o ou de um sistema de transmiss\u00e3o hidr\u00e1ulica.<\/p>\n

A Unidade de Desgaseifica\u00e7\u00e3o Online garante uma opera\u00e7\u00e3o est\u00e1vel ao alterar o modo de transmiss\u00e3o de pot\u00eancia do rotor, de modo que este possa funcionar em alta velocidade, removendo assim o H do alum\u00ednio fundido.<\/p>\n

Atualmente, as velocidades do rotor variam normalmente entre 300 e 450 rpm, com um m\u00e1ximo de 600 rpm. Ap\u00f3s a substitui\u00e7\u00e3o da caixa de engrenagens inferior, o comprimento do eixo de transmiss\u00e3o \u00e9 reduzido, o comprimento do eixo rotativo \u00e9 reduzido, a rigidez do eixo de transmiss\u00e3o \u00e9 aumentada e a oscila\u00e7\u00e3o da plataforma girat\u00f3ria \u00e9 reduzida, de modo que a velocidade m\u00e1xima pode atingir 900 rpm e operar de forma est\u00e1vel. A efici\u00eancia de desgaseifica\u00e7\u00e3o tamb\u00e9m foi aprimorada ainda mais, podendo atingir 50%-65% ou mais da taxa de desgaseifica\u00e7\u00e3o convencional.<\/p>\n

\"Unidade<\/p>\n

Atualmente, a maioria dos processos de fundi\u00e7\u00e3o de ligas de alum\u00ednio tem sido aplicada a Equipamento rotativo de desgaseifica\u00e7\u00e3o<\/a>. A pr\u00e1tica tem demonstrado que diferentes temperaturas do l\u00edquido no dispositivo de desgaseifica\u00e7\u00e3o em linha produzem efeitos de desgaseifica\u00e7\u00e3o distintos. Portanto, \u00e9 necess\u00e1rio levar em considera\u00e7\u00e3o os requisitos de temperatura do l\u00edquido para garantir o efeito de desgaseifica\u00e7\u00e3o do desgaseificador em linha.<\/p>\n

Devido \u00e0 baixa temperatura de fundi\u00e7\u00e3o, o g\u00e1s presente no molde demora demais para sair da superf\u00edcie do l\u00edquido, causando porosidade e, possivelmente, tamb\u00e9m defeitos de qualidade, como esc\u00f3ria e isolamento a frio.<\/p>\n

A temperatura elevada de fundi\u00e7\u00e3o n\u00e3o deve exceder a temperatura de fus\u00e3o. Temperaturas de fundi\u00e7\u00e3o excessivamente altas podem causar vazamento de alum\u00ednio no in\u00edcio da fundi\u00e7\u00e3o.<\/p>\n

Devido aos diferentes comprimentos das ferramentas de transfer\u00eancia e \u00e0s diferentes quedas de temperatura do l\u00edquido, ocorrem pontos quentes nas linhas e a temperatura do l\u00edquido oscila significativamente durante o processo de transfer\u00eancia. Portanto, a temperatura de fundi\u00e7\u00e3o deve referir-se \u00e0 temperatura do l\u00edquido injetado no molde. Normalmente, a temperatura de fundi\u00e7\u00e3o \u00e9 de 50 \u00b0C a 70 \u00b0C superior \u00e0 temperatura real de cristaliza\u00e7\u00e3o da liga.<\/p>","protected":false},"excerpt":{"rendered":"

Online Degassing Unit generally includes two parts: a degassing device and a heating device. The degassing device uses a graphite rotor to transport N2 to…<\/p>","protected":false},"author":1,"featured_media":12315,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[4492,13170],"class_list":["post-12314","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-degassing-unit","tag-online-degassing-unit","tag-rotary-metal-degassing-system"],"yoast_head":"\nOnline Degassing Unit, Rotary Metal Degassing System<\/title>\n<meta name=\"description\" content=\"Online Degassing Unit generally includes two parts: a degassing device and a heating device. 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