{"id":5068,"date":"2020-09-25T06:52:48","date_gmt":"2020-09-25T06:52:48","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5068"},"modified":"2020-09-25T06:52:48","modified_gmt":"2020-09-25T06:52:48","slug":"aluminum-pinholes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-pinholes\/","title":{"rendered":"Trous d'\u00e9pingle en aluminium"},"content":{"rendered":"

La principale cause des trous d'\u00e9pingle dans l'aluminium :<\/strong><\/p>\n

Plus la temp\u00e9rature de fusion est \u00e9lev\u00e9e, plus le m\u00e9tal en fusion absorbera d'hydrog\u00e8ne pr\u00e9sent dans l'air humide. La principale source d'hydrog\u00e8ne est la d\u00e9composition de la vapeur d'eau sous l'effet de la temp\u00e9rature \u00e9lev\u00e9e de l'aluminium en fusion. La solubilit\u00e9 de l'hydrog\u00e8ne dans l'aluminium en fusion augmente avec la temp\u00e9rature, mais elle est tr\u00e8s faible dans l'aluminium solide. Par cons\u00e9quent, au cours du processus de solidification, les pores form\u00e9s par la pr\u00e9cipitation de l\u2019hydrog\u00e8ne sont davantage li\u00e9s \u00e0 la temp\u00e9rature de fusion de l\u2019alliage et \u00e0 la dur\u00e9e de fusion. Si le contr\u00f4le n\u2019est pas ad\u00e9quat lors de la phase finale de la fusion, par exemple si le chauffage est trop rapide ou trop intense, la quantit\u00e9 d\u2019hydrog\u00e8ne absorb\u00e9e par l\u2019aluminium liquide sera importante, l\u2019hydrog\u00e8ne se diffusera plus largement dans l\u2019aluminium liquide et le risque de formation de piq\u00fbres sera accru. On observe moins de pores pr\u00e8s de la surface externe en raison d\u2019un refroidissement plus rapide. Selon certaines donn\u00e9es, \u00e0 700 \u00b0C, la solubilit\u00e9 de l\u2019hydrog\u00e8ne dans 100 g d\u2019aluminium est comprise entre 0,5 et 0,9 cm\u00b3. Lorsque la temp\u00e9rature atteint 850 \u00b0C, la solubilit\u00e9 de l\u2019hydrog\u00e8ne est multipli\u00e9e par 2 \u00e0 3. Par cons\u00e9quent, la fusion doit \u00eatre maintenue en dessous de 750 \u00b0C, et une fusion rapide est recommand\u00e9e ; toutefois, il convient de ma\u00eetriser le probl\u00e8me d\u2019une vitesse d\u2019\u00e9l\u00e9vation trop rapide en fin de phase de chauffage.<\/p>\n

Analyse op\u00e9rationnelle <\/strong><\/p>\n

\u2460La charge n'est pas propre et le temps de cuisson de la charge arri\u00e8re est trop court.<\/p>\n

\u2461 Conception inad\u00e9quate du syst\u00e8me de coul\u00e9e.<\/p>\n

\u2462Une temp\u00e9rature de coul\u00e9e \u00e9lev\u00e9e et une op\u00e9ration de coul\u00e9e mal ex\u00e9cut\u00e9e entra\u00eeneront l'introduction de gaz et de scories.<\/p>\n

\u2463 L'agent de raffinage est humide et le temps de repos est insuffisant apr\u00e8s le traitement de d\u00e9t\u00e9rioration.<\/p>\n

\u2464Le pr\u00e9chauffage de la charge est insuffisant et r\u00e9alis\u00e9 sans soin.<\/p>\n

\"Trous<\/p>\n

Mesures de traitement des trous d'\u00e9pingle dans l'aluminium<\/strong><\/p>\n

Proc\u00e9d\u00e9 de fusion<\/p>\n

\u2460 Modifier le rapport entre les mat\u00e9riaux neufs et les mat\u00e9riaux recycl\u00e9s : 30% de mat\u00e9riaux recycl\u00e9s et 70% de mat\u00e9riaux neufs.<\/p>\n

\u2461Am\u00e9liorer le processus de fusion et \u00e9liminer la rouille, la vase et les autres impuret\u00e9s pr\u00e9sentes \u00e0 la surface de la charge avant utilisation afin d'\u00e9viter toute infiltration d'humidit\u00e9 et d'huile.<\/p>\n

\u2462Pour obtenir des pi\u00e8ces moul\u00e9es en aluminium sans pores ou comportant moins de pores, le pr\u00e9chauffage de la charge est une \u00e9tape cruciale. La temp\u00e9rature de pr\u00e9chauffage est comprise entre 350 et 450 \u00b0C et est maintenue pendant plus de 3 heures. Si la dur\u00e9e de pr\u00e9chauffage de la charge est trop courte, il subsiste un petit nombre de pores fins et diffus dans la section de la pi\u00e8ce moul\u00e9e.<\/p>\n

Le s\u00e9chage et le pr\u00e9chauffage de l'agent d'affinage pr\u00e9sentent de grands avantages. Apr\u00e8s l'affinage et avant la coul\u00e9e, il convient de laisser reposer l'alliage liquide pendant un certain temps afin d'\u00e9liminer les inclusions d'oxydation et l'hydrog\u00e8ne pr\u00e9sents dans l'aluminium liquide. Si l'agent d'affinage est humide, il introduira \u00e9galement une grande quantit\u00e9 d'hydrog\u00e8ne. Les fours qui ont \u00e9t\u00e9 r\u00e9vis\u00e9s ou qui n\u2019ont pas \u00e9t\u00e9 utilis\u00e9s depuis longtemps doivent \u00eatre enti\u00e8rement s\u00e9ch\u00e9s ; sinon, l\u2019humidit\u00e9 pr\u00e9sente dans le mat\u00e9riau r\u00e9fractaire s\u2019\u00e9vaporera et cr\u00e9era une atmosph\u00e8re humide, ce qui entra\u00eenera la formation de pores pendant la fusion.<\/p>\n

Afin d'\u00e9liminer les microperforations dans les pi\u00e8ces moul\u00e9es en alliage d'aluminium, le creuset utilis\u00e9 pour la fusion peut servir de poche de coul\u00e9e. Une fois que le creuset a atteint la temp\u00e9rature de coul\u00e9e apr\u00e8s l'affinage et la m\u00e9tamorphose, il est soulev\u00e9 manuellement et la coul\u00e9e est effectu\u00e9e directement afin d'\u00e9viter l'aspiration d'air due au renversement de la poche. Les outils utilis\u00e9s doivent \u00eatre nettoy\u00e9s avant utilisation, puis recouverts d'un rev\u00eatement protecteur, pr\u00e9chauff\u00e9s et s\u00e9ch\u00e9s afin d'\u00e9viter un pr\u00e9chauffage insuffisant et l'adsorption d'humidit\u00e9 \u00e0 la surface, ce qui g\u00e9n\u00e9rerait une grande quantit\u00e9 de gaz pendant les processus de fusion et de coul\u00e9e, entra\u00eenant l'apparition de porosit\u00e9s dans les pi\u00e8ces moul\u00e9es.<\/p>\n

De plus, utilisez un agent de recouvrement sp\u00e9cial pour recouvrir le creuset pendant le processus de fusion. L'agent de d\u00e9gazage, d'affinage et de modification est s\u00e9lectionn\u00e9, et la quantit\u00e9 ajout\u00e9e correspond \u00e0 0,61 TP3T du poids de l'aluminium fondu. Il doit \u00eatre s\u00e9ch\u00e9 avant utilisation. Lorsque la temp\u00e9rature de l'alliage liquide atteint 720 \u2103, utilisez une cloche en acier inoxydable pour presser l'agent de d\u00e9gazage et d'affinage au fond du creuset et d\u00e9placez-la \u00e0 vitesse constante le long de la paroi int\u00e9rieure du creuset, afin d'emp\u00eacher toute sorte d'impuret\u00e9s de p\u00e9n\u00e9trer dans le creuset.<\/p>","protected":false},"excerpt":{"rendered":"

The main reason for aluminum pinholes: The higher the smelting temperature, the more serious the molten metal will absorb hydrogen from the humid air. The…<\/p>","protected":false},"author":1,"featured_media":5139,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5068","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminum Pinholes Treatment Measures in Casting Process<\/title>\n<meta name=\"description\" content=\"Aluminum Pinholes Treatment Measures: use a special covering agent to cover during the melting process. 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