{"id":4910,"date":"2020-09-18T08:15:03","date_gmt":"2020-09-18T08:15:03","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4910"},"modified":"2020-09-18T08:15:03","modified_gmt":"2020-09-18T08:15:03","slug":"filtering-technology","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/filtering-technology\/","title":{"rendered":"Technologie de filtration"},"content":{"rendered":"

La technologie de filtration par filtres en mousse c\u00e9ramique permet d\u2019atteindre efficacement l\u2019objectif de purification des alliages de fonderie liquides. Dans la production de pi\u00e8ces moul\u00e9es, le taux de rebut d\u00fb \u00e0 des d\u00e9fauts de coul\u00e9e, tels que les inclusions non m\u00e9talliques, repr\u00e9sente g\u00e9n\u00e9ralement entre 50% et 60% du nombre total de pi\u00e8ces rejet\u00e9es. Les d\u00e9fauts d\u2019inclusion r\u00e9duisent non seulement consid\u00e9rablement les propri\u00e9t\u00e9s m\u00e9caniques de la pi\u00e8ce moul\u00e9e, mais ont \u00e9galement un effet n\u00e9faste sur ses performances d\u2019usinage et son aspect. La purification des alliages de fonderie liquides et la r\u00e9duction, voire l\u2019\u00e9limination, des diverses inclusions non m\u00e9talliques constituent sans aucun doute une mesure technique tr\u00e8s importante pour obtenir des pi\u00e8ces moul\u00e9es de haute qualit\u00e9.<\/p>\n

Depuis pr\u00e8s de deux d\u00e9cennies, on utilise une technologie de filtration consistant \u00e0 installer un dispositif filtrant sur le syst\u00e8me de coul\u00e9e. Au d\u00e9part, on utilisait du sable huil\u00e9 ou de l'argile pour fabriquer des noyaux en sable perc\u00e9s de trous, g\u00e9n\u00e9ralement ronds ou carr\u00e9s, d'une \u00e9paisseur de 10 \u00e0 20 mm, qui \u00e9taient utilis\u00e9s apr\u00e8s s\u00e9chage. Ce filtre est g\u00e9n\u00e9ralement plac\u00e9 \u00e0 l\u2019extr\u00e9mit\u00e9 sup\u00e9rieure ou inf\u00e9rieure de la masselotte et dans le canal transversal afin de filtrer les r\u00e9sidus ; cependant, le filtre en sable huil\u00e9 ou en sable argileux pr\u00e9sente une faible r\u00e9sistance \u00e0 l\u2019\u00e9rosion par le m\u00e9tal en fusion \u00e0 haute temp\u00e9rature, ce qui limite son utilisation. Par la suite, les tamis filtrants en fibres et en m\u00e9tal ont \u00e9t\u00e9 largement promus et mis en \u0153uvre. Ils sont tr\u00e8s pratiques \u00e0 utiliser, mais leur r\u00e9sistance aux hautes temp\u00e9ratures et leur efficacit\u00e9 de filtration ne sont toujours pas optimales, ce qui limite \u00e9galement leur utilisation \u00e0 grande \u00e9chelle.<\/p>\n

\"Technologie<\/p>\n

Avec le d\u00e9veloppement de la science et de la technologie, ainsi que l'am\u00e9lioration de la puret\u00e9 des alliages m\u00e9talliques destin\u00e9s \u00e0 la fonderie et le renforcement des exigences en mati\u00e8re de performances de coul\u00e9e, un nouveau type de filtre c\u00e9ramique alv\u00e9ol\u00e9 a \u00e9t\u00e9 mis en \u0153uvre dans la production de pi\u00e8ces moul\u00e9es au cours des dix derni\u00e8res ann\u00e9es, ce qui a permis d'am\u00e9liorer la qualit\u00e9 de la filtration du m\u00e9tal en fusion. La haute qualit\u00e9 filtre en mousse c\u00e9ramique<\/a> joue un r\u00f4le tr\u00e8s important dans l'am\u00e9lioration de la qualit\u00e9 des pi\u00e8ces moul\u00e9es. Il permet de filtrer efficacement les inclusions solides non m\u00e9talliques primaires et secondaires pr\u00e9sentes dans le m\u00e9tal en fusion, ce qui r\u00e9duit les trous de scories, am\u00e9liore les propri\u00e9t\u00e9s m\u00e9caniques des pi\u00e8ces moul\u00e9es, diminue la sur\u00e9paisseur d'usinage, am\u00e9liore l'\u00e9tat de surface des pi\u00e8ces moul\u00e9es et prolonge la dur\u00e9e de vie des outils d'usinage.<\/p>\n

Le filtre en mousse c\u00e9ramique utilise de la mousse de polyur\u00e9thane comme support. Apr\u00e8s hydrolyse, celui-ci est plong\u00e9 dans un enrobage compos\u00e9 de poudre de c\u00e9ramique, d'un liant, d'un adjuvant de frittage, d'un agent de suspension, etc., puis l'exc\u00e8s d'enrobage est \u00e9limin\u00e9 par pressage afin d'obtenir un rev\u00eatement c\u00e9ramique uniform\u00e9ment r\u00e9parti. Il est ensuite appliqu\u00e9 sur la structure du support pour former un corps vert, qui est ensuite s\u00e9ch\u00e9 puis cuit \u00e0 haute temp\u00e9rature.<\/p>","protected":false},"excerpt":{"rendered":"

Filtering technology of ceramic foam filters can effectively achieve the purpose of purifying liquid casting alloys. In casting production, the casting rejection rate due to…<\/p>","protected":false},"author":1,"featured_media":4911,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4705],"class_list":["post-4910","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-filtering-technology"],"yoast_head":"\nFiltering Technology of Ceramic Foam Filters in Aluminum Casting<\/title>\n<meta name=\"description\" content=\"Filtering technology of ceramic foam filters can effectively achieve the purpose of purifying metal. 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