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Informations aluminium et le processus de fonte d'aluminium
L'aluminium est parmi ceux des métaux qui peuvent être «jeté» par tous les processus utilisés dans le moulage de métal. Ces processus, en ordre décroissant de quantité de fonte d'aluminium sont: moulage, coulée en moule permanent, moulage au sable, moulage en plâtre, cire perdue, et la coulée continue. Le casting processus est sélectionné sur la base de facteurs tels que le coût, la faisabilité, la qualité, etc
Faisabilité n'est pas un problème, comme toutes les méthodes ci-dessus sont très praticable. Cependant, le procédé de coulée la plus appropriée peut être décidée en fonction des caractéristiques de conception ou de dimensions. Par exemple-Large produits sont fabriqués en utilisant le moulage au sable. Le facteur de qualité est également importante dans la sélection le processus de coulée. Qualité désigne à la fois les propriétés, mécaniques (ductilité et la résistance) et la solidité (imperfections de surface, des fissures, la porosité et la liberté).
L' méthodes les plus couramment utilisées peuvent être décrites comme suit:
Moulage sous pression: Selon les statistiques, environ $ 2,5 millions de dollars d'emporte-pièces moulées en alliages d'aluminium sont produites dans les Etats-Unis seul chaque année. Le processus de moulage utilise près de deux fois le tonnage d'alliages d'aluminium comme la combinaison de procédés de coulée d'autres. Moulage sous pression est la mieux adaptée pour la production de grandes quantités des pièces relativement petites. Aluminium moulé fonderie jusqu'à 50 kg de poids peut être produit si la machine coulée coûts et de l'outillage de haute sont justifiées.
Quelques applications courantes des moulé alliages d'aluminium sont compris en alliage 380,0 pour les boîtiers tondeuse, alliage A380.0 pour les boîtiers réverbères, matériel dentaire, les cadres de la machine à écrire, alliage de 360,0 pour les poêles à frire, les boîtes d'instruments, plaques de couverture, les pièces nécessitant résistance à la corrosion, alliage de 413,0 pour les pièces de moteur hors-bord du moteur comme les bielles, les pistons, le logement, et en alliage 518,1 pour les composants de convoyeurs, pièces escalator, avions, matériel marin.
Die Castings ne peut pas être facilement chauffé ou soudés dû aux gaz piégé. Des efforts sont actuellement sur le pied de guerre pour surmonter cet obstacle. Les coulées sous pression alliages d'aluminium sont généralement des produits à l'aide d'aluminium-silicium-cuivre. Cette famille d'alliage donne une excellente combinaison de résistance à la corrosion, la force, et le coût, avec un répit de 'hot essoufflement et une grande fluidité qui sont obligatoires pour la coulée facile. Si on désire une meilleure résistance à la corrosion, il faut utiliser des alliages ayant une teneur plus faible en cuivre.
«Moule permanent" casting: casting "moule permanent" est le mieux adapté pour les gros volumes de production. Leur taille est plus grande que «mourir castings. Ces moulages ont un très faible taux coulée. Ils sont alimentés par gravité. Des propriétés mécaniques remarquables sont exposées par la fonte "en moule permanent. Il ya beaucoup des possibilités d'amélioration si elles reçoivent un traitement thermique.
Certains des alliages les plus courants de la «coulée en moule en aluminium permanente» comprennent alliage 366,0 pour les pistons de l'automobile, Alliages 355,0, A357.0, C355.0 pour les roues, pignons de distribution, des compresseurs, des missiles et des pièces d'aéronefs, alliages A356.0, 356,0 pour les roues des avions, des pièces de machine des outils, des pièces de la pompe, les corps de vanne, Accastillage, et 296,0, 333,0, 319,0.
Moulage au sable: Ce type de coulée implique la formation de moule (avec du sable). Il est inclusif de moulage au sable conservatrice et coulée à mousse perdue. La première consiste à former un modèle de sable, coulée du métal en fusion dans elle et rompre une fois le produit formé. Lost-foam tendance implique de mettre un modèle superflu de polystyrène dans le moule. Le reste de la procédure est la même que le moulage au sable conservatrice.
About the Author
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Plaster-Mold Casting