{"id":1203,"date":"2020-04-17T09:04:22","date_gmt":"2020-04-17T09:04:22","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=1203"},"modified":"2020-08-28T06:46:16","modified_gmt":"2020-08-28T06:46:16","slug":"foundry-ceramic-filters","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/foundry-ceramic-filters\/","title":{"rendered":"Filtres en c\u00e9ramique pour fonderie"},"content":{"rendered":"

Les filtres c\u00e9ramiques de fonderie sont fabriqu\u00e9s \u00e0 partir de mousse de polyur\u00e9thane, puis immerg\u00e9s dans une suspension c\u00e9ramique compos\u00e9e de poudre de c\u00e9ramique, d\u2019un liant, d\u2019un adjuvant de frittage, d\u2019un agent de suspension, etc. L\u2019exc\u00e8s de suspension est ensuite \u00e9limin\u00e9 par pressage, de sorte que la suspension c\u00e9ramique soit appliqu\u00e9e uniform\u00e9ment sur la structure porteuse pour former un corps vert. Le corps vert est s\u00e9ch\u00e9 puis fritt\u00e9 \u00e0 haute temp\u00e9rature. Ce proc\u00e9d\u00e9, \u00e9galement appel\u00e9 \u00ab m\u00e9thode d\u2019impr\u00e9gnation de mousse organique \u00bb, est actuellement l\u2019un des proc\u00e9d\u00e9s de fabrication de c\u00e9ramique \u00e0 base de mousse les plus courants en Chine.<\/p>\n

Proc\u00e9d\u00e9 de fabrication de filtres en c\u00e9ramique pour la fonderie<\/h2>\n

Le proc\u00e9d\u00e9 de projection de boue est l'un des proc\u00e9d\u00e9s utilis\u00e9s pour la fabrication de filtre en c\u00e9ramique alv\u00e9ol\u00e9e<\/a>. Il projette la barbotine c\u00e9ramique sous pression vers les plaques filtrantes par l'interm\u00e9diaire d'une buse de pulv\u00e9risation. L'objectif est d'am\u00e9liorer les propri\u00e9t\u00e9s de surface du corps cru, notamment en am\u00e9liorant la finesse de la surface et en renfor\u00e7ant l'\u00e9paisseur des nervures. Parall\u00e8lement, ce processus influe \u00e9galement sur la qualit\u00e9 interne du produit. Le processus de pulv\u00e9risation se pr\u00e9sente principalement sous deux formes selon la m\u00e9thode utilis\u00e9e : la pulv\u00e9risation manuelle et la pulv\u00e9risation automatique. Selon la s\u00e9quence de pulv\u00e9risation, on distingue la pulv\u00e9risation apr\u00e8s enduisage et la pulv\u00e9risation apr\u00e8s s\u00e9chage.<\/p>\n

\"Filtres<\/p>\n

Proc\u00e9d\u00e9 de pulv\u00e9risation manuelle<\/strong><\/p>\n

La projection manuelle consiste \u00e0 utiliser la pression g\u00e9n\u00e9r\u00e9e par le compresseur d'air (0,5 \u00e0 1,0 MPa) pour projeter la boue \u00e0 partir du pistolet de projection. L'op\u00e9rateur contr\u00f4le la pulv\u00e9risation sur la surface de la pi\u00e8ce brute et pulv\u00e9rise l'autre face une fois que la premi\u00e8re est s\u00e8che. Les avantages sont un investissement r\u00e9duit, un moindre gaspillage de boue et un contr\u00f4le flexible du volume pulv\u00e9ris\u00e9. Les inconv\u00e9nients sont une main-d'\u0153uvre importante, une faible efficacit\u00e9 de travail, une adh\u00e9rence in\u00e9gale de la boue, etc.<\/p>\n

Proc\u00e9d\u00e9 de pulv\u00e9risation automatique<\/strong><\/p>\n

Le proc\u00e9d\u00e9 de pulv\u00e9risation automatique s'inspire du processus de gla\u00e7age utilis\u00e9 dans la fabrication de la c\u00e9ramique \u00e0 usage quotidien : la barbotine est pulv\u00e9ris\u00e9e sur la surface des pi\u00e8ces brutes transport\u00e9es par un tapis roulant ou une cha\u00eene gr\u00e2ce \u00e0 une t\u00eate de pulv\u00e9risation, puis s\u00e9ch\u00e9e par un bref passage dans un flux d'air chaud ou sous un rayonnement infrarouge. Apr\u00e8s avoir retourn\u00e9 la pi\u00e8ce, on pulv\u00e9rise l'autre face, puis on la s\u00e8che pour achever le processus de pulv\u00e9risation automatique. Les avantages de la pulv\u00e9risation automatique sont une grande efficacit\u00e9 de travail et une pulv\u00e9risation relativement uniforme des \u00e9bauches. Ses inconv\u00e9nients sont un investissement important lors de la phase initiale, un gaspillage important de barbotine et le remplacement fr\u00e9quent des buses par la suite.<\/p>\n

S\u00e9quence de pulv\u00e9risation<\/strong><\/p>\n

La projection apr\u00e8s encollement est une projection \u00e0 l'\u00e9tat humide, ce qui permet d'\u00e9viter l'\u00e9tape de s\u00e9chage ult\u00e9rieure ; l'effet d'adsorption de la pi\u00e8ce brute sur la boue est g\u00e9n\u00e9ralement satisfaisant. Cependant, pour les produits de grande taille et de faible \u00e9paisseur, la projection apr\u00e8s encollement est \u00e9galement appropri\u00e9e afin d'\u00e9viter d'endommager le corps cru par une projection effectu\u00e9e apr\u00e8s s\u00e9chage. Son inconv\u00e9nient r\u00e9side toutefois dans le fait qu\u2019il ne permet de pulv\u00e9riser que sur une seule face, g\u00e9n\u00e9ralement la face avant n\u00e9cessaire au filtrage du m\u00e9tal en fusion. Compte tenu de l\u2019efficacit\u00e9 de cette technique, la m\u00e9thode de pulv\u00e9risation apr\u00e8s enduisage n\u2019est pas tr\u00e8s courante.<\/p>\n

La projection apr\u00e8s s\u00e9chage rel\u00e8ve de la projection sur \u00e9bauche s\u00e8che ; elle convient \u00e0 la projection double face, et la boue peut \u00eatre ajust\u00e9e pour obtenir la consistance maximale du jet, afin d'optimiser au maximum la surface de l'\u00e9bauche. Il s'agit d'une m\u00e9thode de projection couramment utilis\u00e9e dans la production de c\u00e9ramique expans\u00e9e. Les inconv\u00e9nients de la projection apr\u00e8s s\u00e9chage sont une main-d'\u0153uvre importante, des risques d'endommagement de la pi\u00e8ce brute et une tendance \u00e0 la formation de scories.<\/p>","protected":false},"excerpt":{"rendered":"

Foundry ceramic filters are made of polyurethane foam plastic and immersed in the ceramic slurry made of ceramic powder, binder, sintering aid, suspending agent, etc.…<\/p>","protected":false},"author":1,"featured_media":3825,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233,39],"tags":[1598,1599,1595,87,86,485,1455,1454,1451,104,432,486,1606,1447,1601,1600,1456,422,1597,1441,1605,418,1448,1453,417,416,1444,412,1452,1604,298,1446,1603,1602,1596,406,1594,405],"class_list":["post-1203","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-foundry-ceramic-filters","tag-20-ppi-filter-foam","tag-30-ppi-filter-foam","tag-alumina-filter","tag-aluminium-casting-company-foundry-ceramic-filters","tag-aluminium-die-casting-companies-foundry-ceramic-filters","tag-aluminum-casting-filter","tag-asian-foundry-filters","tag-casting-filter","tag-ceramic-disc-filter","tag-ceramic-filter","tag-ceramic-filter-foundry","tag-ceramic-filter-manufacturers","tag-ceramic-filter-price","tag-ceramic-foam-filter-china","tag-ceramic-foam-filter-manufacturer-process","tag-ceramic-foam-filter-manufacturers-india","tag-ceramic-foundry-filter","tag-filter-foam-manufacturers","tag-filter-foundry","tag-foam-ceramic-filter","tag-foam-furnace-filter","tag-foundry-ceramic-filters","tag-foundry-coatings","tag-foundry-filter","tag-foundry-filters","tag-honeycomb-ceramic-filter","tag-lanik-ceramic-foam-filters","tag-metal-foam-filter","tag-molten-metal-filtration","tag-open-cell-foam-filter-material","tag-porous-ceramic-filter","tag-porous-filter-material","tag-reticulated-foam-filter","tag-sic-ceramic-foam-filter","tag-silicon-carbide-ceramic-filter","tag-silicon-carbide-ceramic-foam-filter","tag-silicon-carbide-filter","tag-silicon-carbide-foam-filter"],"yoast_head":"\nFoundry Ceramic Filters | Ceramic Foam Filter Manufacturer Process<\/title>\n<meta name=\"description\" content=\"Foundry ceramic filters are made of polyurethane foam plastic and immersed in the ceramic slurry made of ceramic powder, binder.\" \/>\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\/fr\/foundry-ceramic-filters\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Foundry Ceramic Filters | Ceramic Foam Filter Manufacturer Process\" \/>\n<meta property=\"og:description\" content=\"Foundry ceramic filters are made of polyurethane foam plastic and immersed in the ceramic slurry made of ceramic powder, binder.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.alalloycasting.com\/fr\/foundry-ceramic-filters\/\" \/>\n<meta property=\"og:site_name\" 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