{"id":2104,"date":"2020-06-02T06:50:34","date_gmt":"2020-06-02T06:50:34","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2104"},"modified":"2020-09-14T09:32:48","modified_gmt":"2020-09-14T09:32:48","slug":"aluminum-alloy-wheels","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-alloy-wheels\/","title":{"rendered":"Jantes en alliage d'aluminium"},"content":{"rendered":"<p>Les jantes en alliage d'aluminium pr\u00e9sentent de nombreuses caract\u00e9ristiques que les jantes en acier ne poss\u00e8dent pas ; c'est pourquoi elles sont largement utilis\u00e9es sur les voitures, les motos et d'autres v\u00e9hicules. En raison des exigences de qualit\u00e9 \u00e9lev\u00e9es auxquelles doivent r\u00e9pondre les jantes automobiles, leur structure se pr\u00eate particuli\u00e8rement bien au moulage \u00e0 basse pression, et la demande est importante. C'est pourquoi le d\u00e9veloppement de la technologie de moulage \u00e0 basse pression a \u00e9t\u00e9 fortement encourag\u00e9. \u00c0 l'heure actuelle, le moulage \u00e0 basse pression est devenu le proc\u00e9d\u00e9 principal pour la production de jantes en alliage d'aluminium. AdTech propose <a href=\"https:\/\/www.alalloycasting.com\/fr\/hot-top-casting-parts\/\">pi\u00e8ces moul\u00e9es \u00e0 haute temp\u00e9rature<\/a>,<a href=\"https:\/\/www.alalloycasting.com\/fr\/flow-control-series\/\"> s\u00e9rie de r\u00e9gulateurs de d\u00e9bit<\/a> pour le moulage \u00e0 basse pression de jantes en alliage d'aluminium.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1909\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/05\/Aluminum-Alloy-Casting-Performance.jpg\" alt=\"Performances de la coul\u00e9e d&#039;alliages d&#039;aluminium\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/05\/Aluminum-Alloy-Casting-Performance.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/05\/Aluminum-Alloy-Casting-Performance-300x240.jpg 300w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/05\/Aluminum-Alloy-Casting-Performance-125x100.jpg 125w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><a href=\"https:\/\/www.alalloycasting.com\/fr\/pressure-die-casting-process\/\">Moulage \u00e0 basse pression<\/a> permet d'atteindre un haut degr\u00e9 de m\u00e9canisation et d'automatisation, ce qui non seulement am\u00e9liore la productivit\u00e9, mais r\u00e9duit \u00e9galement consid\u00e9rablement l'intensit\u00e9 du travail des ouvriers. Cependant, la qualit\u00e9 des pi\u00e8ces moul\u00e9es \u00e0 basse pression est influenc\u00e9e par divers facteurs, tels que les plans de fabrication, les param\u00e8tres de processus, la structure des moules et les op\u00e9rations manuelles, ainsi que par leurs interactions. Une conception inad\u00e9quate de l\u2019un des maillons de la cha\u00eene ou une mauvaise ex\u00e9cution des op\u00e9rations peut entra\u00eener l\u2019apparition de d\u00e9fauts dans les pi\u00e8ces moul\u00e9es \u00e0 basse pression. L\u2019apparition de fissures sur les jantes en alliage d\u2019aluminium est un facteur important qui affecte les co\u00fbts et l\u2019efficacit\u00e9 de production des entreprises, et les fissures au niveau du moyeu constituent un danger latent majeur pour la s\u00e9curit\u00e9 automobile. Il est donc essentiel d\u2019\u00e9tudier les causes des fissures sur les jantes en alliage d\u2019aluminium moul\u00e9es \u00e0 basse pression.<\/p>\n<h2>Causes des fissures dans les jantes en alliage d'aluminium<\/h2>\n<p>Les fissures des jantes en alliage d'aluminium moul\u00e9es sous basse pression apparaissent principalement aux endroits o\u00f9 les contraintes sont concentr\u00e9es. Elles sont dues \u00e0 la r\u00e9partition in\u00e9gale des forces lors de l'\u00e9jection du moyeu ou \u00e0 la solidification du m\u00e9tal au niveau du canal de coul\u00e9e. On distingue g\u00e9n\u00e9ralement deux types de fissures : les fissures \u00e0 froid et les fissures \u00e0 chaud.<\/p>\n<p>On parle de fissuration \u00e0 froid lorsque des fissures se forment alors que l'alliage se trouve en dessous de sa temp\u00e9rature de solidus. La fissuration \u00e0 froid survient lorsque la pi\u00e8ce moul\u00e9e est refroidie \u00e0 une temp\u00e9rature basse et que les contraintes exerc\u00e9es sur celle-ci d\u00e9passent les limites admissibles de r\u00e9sistance ou de plasticit\u00e9 de la pi\u00e8ce elle-m\u00eame. Les fissures \u00e0 froid apparaissent principalement \u00e0 la surface de la pi\u00e8ce moul\u00e9e, et la surface de la fissure pr\u00e9sente une l\u00e9g\u00e8re oxydation. On consid\u00e8re g\u00e9n\u00e9ralement que la fissuration thermique se produit pendant la solidification de l\u2019alliage. En raison du transfert de chaleur par la paroi du moule, la pi\u00e8ce moul\u00e9e commence toujours \u00e0 se solidifier \u00e0 partir de la surface. Lorsqu\u2019un grand nombre de ramifications apparaissent \u00e0 la surface de la pi\u00e8ce moul\u00e9e et se chevauchent pour former un squelette complet, celle-ci pr\u00e9sente un retrait de solidification.<\/p>\n<p>\u00c0 ce stade, il subsiste encore entre les dendrites une couche de m\u00e9tal liquide qui ne s'est pas encore solidifi\u00e9e. Si le retrait de la pi\u00e8ce moul\u00e9e n'est pas entrav\u00e9, la couche dendritique peut se contracter librement sans subir de contrainte, et aucune contrainte n'appara\u00eetra. Lorsque le retrait de la couche de dendrites est entrav\u00e9, celle-ci ne peut pas se contracter librement ni \u00eatre soumise \u00e0 une force de traction, ce qui entra\u00eene l'apparition d'une contrainte de traction. \u00c0 ce moment-l\u00e0, le film liquide entre les dendrites sera d\u00e9form\u00e9 sous l\u2019effet de l\u2019\u00e9tirement. Lorsque la contrainte de traction d\u00e9passe la limite de r\u00e9sistance du film liquide, les dendrites seront \u00e9cart\u00e9es les unes des autres. Cependant, il reste encore un peu de m\u00e9tal liquide autour de la partie fissur\u00e9e. Si le film liquide est \u00e9cart\u00e9 lentement et qu\u2019il y a suffisamment de m\u00e9tal liquide autour pour s\u2019\u00e9couler \u00e0 temps dans la zone fissur\u00e9e, celle-ci sera alors combl\u00e9e et \u201c r\u00e9par\u00e9e \u201d. Les pi\u00e8ces moul\u00e9es ne pr\u00e9senteront pas de fissures \u00e0 chaud. Si les fissures ne peuvent pas \u00eatre \u201c r\u00e9par\u00e9es \u201d, des fissures \u00e0 chaud appara\u00eetront dans la pi\u00e8ce moul\u00e9e. La surface de la fracture \u00e0 chaud est fortement oxyd\u00e9e, pr\u00e9sentant une couleur sombre ou noire d\u00e9pourvue d\u2019\u00e9clat m\u00e9tallique.<\/p>","protected":false},"excerpt":{"rendered":"<p>Aluminum alloy wheels have many unmatched characteristics of steel wheels, so aluminum alloy wheels have been widely used in cars, motorcycles and other vehicles. Due&hellip;<\/p>","protected":false},"author":1,"featured_media":2107,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[302,153],"class_list":["post-2104","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-alloy-wheels","tag-low-pressure-casting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aluminum Alloy Wheels Crack, Low Pressure Casting<\/title>\n<meta name=\"description\" content=\"Aluminum alloy wheels have many unmatched characteristics of steel wheels, so aluminum alloy wheels have been widely used in cars.\" \/>\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\/aluminum-alloy-wheels\/\" 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