{"id":2904,"date":"2020-07-17T03:36:00","date_gmt":"2020-07-17T03:36:00","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2904"},"modified":"2020-10-14T09:23:50","modified_gmt":"2020-10-14T09:23:50","slug":"degassing-process-in-aluminum-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-process-in-aluminum-casting\/","title":{"rendered":"Proc\u00e9d\u00e9 de d\u00e9gazage dans la fonderie d'aluminium"},"content":{"rendered":"<p>La porosit\u00e9 des alliages d'aluminium appara\u00eet souvent dans la partie sup\u00e9rieure de la pi\u00e8ce moul\u00e9e et se manifeste g\u00e9n\u00e9ralement \u00e0 la surface des parties saillantes de celle-ci. Les pores cach\u00e9s \u00e0 l'int\u00e9rieur de la pi\u00e8ce moul\u00e9e peuvent \u00eatre d\u00e9tect\u00e9s par radiographie. Le processus de d\u00e9gazage utilis\u00e9 dans la coul\u00e9e d'aluminium permet de rem\u00e9dier \u00e0 ce probl\u00e8me de porosit\u00e9.<\/p>\n<h2>Causes de la porosit\u00e9 dans les alliages d'aluminium<\/h2>\n<ul>\n<li>La vitesse de coul\u00e9e est trop \u00e9lev\u00e9e, ce qui entra\u00eene l'introduction d'air ;<\/li>\n<li>Mauvaise \u00e9vacuation des gaz de moulage ;<\/li>\n<li>L'aluminium liquide s'\u00e9coule trop vite ;<\/li>\n<li>La temp\u00e9rature de fusion est trop \u00e9lev\u00e9e ;<\/li>\n<li>Mauvais d\u00e9gazage de l'alliage ;<\/li>\n<li>La temp\u00e9rature de coul\u00e9e est trop \u00e9lev\u00e9e ;<\/li>\n<li>Le noyau de sable n'est pas sec, l'\u00e9chappement est d\u00e9fectueux ou il y a trop d'essence.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5598\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/07\/Degassing-Process-in-Aluminum-Casting-1.jpg\" alt=\"Proc\u00e9d\u00e9 de d\u00e9gazage dans la fonderie d&#039;aluminium\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Degassing-Process-in-Aluminum-Casting-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Degassing-Process-in-Aluminum-Casting-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h2>Proc\u00e9d\u00e9 de d\u00e9gazage dans la fonderie d'aluminium<\/h2>\n<ol>\n<li>Verser le m\u00e9tal en fusion en douceur ;<\/li>\n<li>Installez des fentes d'\u00e9vacuation ou des bouchons d'\u00e9vacuation aux endroits o\u00f9 les gaz m\u00e9talliques sont difficiles \u00e0 \u00e9vacuer, et nettoyez-les r\u00e9guli\u00e8rement ;<\/li>\n<li>Lors de la coul\u00e9e, la louche doit \u00eatre plac\u00e9e aussi pr\u00e8s que possible de la coupelle d'entr\u00e9e ;<\/li>\n<li>Contr\u00f4ler rigoureusement la temp\u00e9rature de l'aluminium en fusion afin d'\u00e9viter toute surchauffe ;<\/li>\n<li>L'aluminium liquide est correctement d\u00e9gaz\u00e9, AdTech <a href=\"http:\/\/www.alalloycasting.com\/fr\/online-degassing-device\/\">unit\u00e9 de d\u00e9gazage en ligne<\/a> et <a href=\"http:\/\/www.alalloycasting.com\/fr\/refining-flux\/\">flux de raffinage<\/a> est utile pour le d\u00e9gazage de l'aluminium liquide ;<\/li>\n<li>Il faut faire s\u00e9cher le noyau d'argile, d\u00e9boucher l'orifice d'a\u00e9ration, le faire cuire \u00e0 nouveau une fois qu'il a repris de l'humidit\u00e9, puis \u00e9vider le centre du grand noyau d'argile ;<\/li>\n<li>Une fois le rev\u00eatement appliqu\u00e9 sur les caract\u00e8res m\u00e9talliques, il convient de le laisser s\u00e9cher avant de proc\u00e9der au coulage.<\/li>\n<\/ol>\n<p>Plus le d\u00e9gazage requis est important, plus le temps n\u00e9cessaire au d\u00e9gazage est long. L'efficacit\u00e9 du d\u00e9gazage et la dur\u00e9e de celui-ci d\u00e9pendent de la vitesse du rotor et du volume de gaz inject\u00e9, ces deux param\u00e8tres \u00e9tant contr\u00f4l\u00e9s par l'\u00e9quipement de d\u00e9gazage. La vitesse du rotor doit \u00eatre r\u00e9gl\u00e9e \u00e0 un niveau \u00e9lev\u00e9 afin que les bulles \u00e9ject\u00e9es puissent se r\u00e9partir dans l\u2019ensemble de la masse fondue. Si la vitesse du rotor est trop faible, les bulles resteront pr\u00e8s de la tige rotative et ne pourront pas se disperser. Si la vitesse du rotor est trop \u00e9lev\u00e9e, cela peut aggraver le tourbillonnement, ce qui entra\u00eenera la r\u00e9introduction d\u2019hydrog\u00e8ne et d\u2019inclusions dans l\u2019aluminium fondu. Un d\u00e9flecteur doit \u00eatre utilis\u00e9 pour emp\u00eacher la solution m\u00e9tallique de former des tourbillons et de subir un tourbillonnement excessif. Le volume de gaz inject\u00e9 doit \u00e9galement \u00eatre r\u00e9gl\u00e9 de mani\u00e8re \u00e0 ce que la quantit\u00e9 appropri\u00e9e de gaz p\u00e9n\u00e8tre dans le m\u00e9tal en fusion. Pendant le processus de d\u00e9gazage, de l\u00e9g\u00e8res bulles doivent remonter \u00e0 la surface de la masse fondue. La pr\u00e9sence de grosses bulles \u00e0 la surface du liquide indique que le volume de gaz inject\u00e9 est trop \u00e9lev\u00e9. Une quantit\u00e9 excessive de gaz entra\u00eenera le passage du gaz pulv\u00e9ris\u00e9 \u00e0 travers le rotor en rotation et sa remont\u00e9e vers la surface du liquide sous forme de grosses bulles. Cette situation n\u2019a aucun effet sur le d\u00e9gazage. Une quantit\u00e9 excessive de gaz ne fera qu\u2019entra\u00eener un gaspillage de gaz inerte.<\/p>","protected":false},"excerpt":{"rendered":"<p>Porosity in aluminum alloy often occurs in the upper part of the casting and often occurs on the surface of the protruding part of the&hellip;<\/p>","protected":false},"author":1,"featured_media":5599,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[1466],"class_list":["post-2904","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-degassing-process-in-aluminum-casting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Degassing Process in Aluminum Casting,Online Degassing Unit<\/title>\n<meta name=\"description\" content=\"Degassing Process in Aluminum Casting is necessary, AdTech online degassing unit 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