{"id":685,"date":"2017-12-15T12:47:17","date_gmt":"2017-12-15T12:47:17","guid":{"rendered":"http:\/\/avanexa.in\/calmet\/?post_type=articles&p=685"},"modified":"2018-05-17T07:57:53","modified_gmt":"2018-05-17T07:57:53","slug":"why-is-cast-iron-best-suited-for-the-manufacturing-of-pumps","status":"publish","type":"page","link":"https:\/\/www.calmet.com\/fr\/why-is-cast-iron-best-suited-for-the-manufacturing-of-pumps\/","title":{"rendered":"Pourquoi la fonte est-elle le mat\u00e9riau le plus adapt\u00e9 \u00e0 la fabrication de pompes\u00a0?"},"content":{"rendered":"
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Pourquoi la fonte est-elle le mat\u00e9riau le plus adapt\u00e9 \u00e0 la fabrication de pompes\u00a0?<\/span><\/h1>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>
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La fonte est privil\u00e9gi\u00e9e pour diverses applications, notamment la fabrication de pompes. Elle est particuli\u00e8rement adapt\u00e9e aux pompes centrifuges et aux pompes de puisard. La fonte poss\u00e8de des propri\u00e9t\u00e9s physiques et m\u00e9caniques qui la rendent id\u00e9ale pour la fabrication de pompes. Pour les applications \u00e0 haute temp\u00e9rature, le choix du m\u00e9tal appropri\u00e9 d\u00e9pend de trois facteurs.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>

Avantages du moulage\u00a0:<\/h4>\n\t
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1. R\u00e9sistance \u00e0 la corrosion
\n2. Limite de temp\u00e9rature maximale
\n3. Coefficient de dilatation thermique<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>

1. R\u00e9sistance \u00e0 la corrosion :<\/h4>\n\t
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Une augmentation progressive de la temp\u00e9rature rend le liquide plus corrosif. La fonte pr\u00e9sente une r\u00e9sistance \u00e0 la corrosion relativement bonne. C'est pourquoi elle est privil\u00e9gi\u00e9e pour les pompes utilis\u00e9es dans des applications \u00e0 haute temp\u00e9rature.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n

2. Limite de temp\u00e9rature maximale :<\/h4>\n\t
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En cas de variation brutale de temp\u00e9rature, le m\u00e9tal est susceptible de subir un choc thermique. Cela peut se produire, par exemple, en versant de l'huile chaude dans une pompe froide pour le d\u00e9marrage ou en pulv\u00e9risant de l'eau froide sur une pompe chaude lors du nettoyage. Les pompes en fonte fonctionnent correctement jusqu'\u00e0 une temp\u00e9rature de 650 degr\u00e9s Fahrenheit (environ 343 \u00b0C). Elles pr\u00e9sentent une r\u00e9sistance relativement bonne aux d\u00e9faillances dues aux chocs thermiques en dessous de cette temp\u00e9rature. La fonte ductile trait\u00e9e thermiquement r\u00e9siste \u00e0 la d\u00e9faillance jusqu'\u00e0 800 degr\u00e9s Fahrenheit (environ 427 \u00b0C).<\/p>\n\n\t\t<\/div>\n\t<\/div>\n

3. Coefficient de dilatation thermique :<\/h4>\n\t
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La dilatation thermique provoque des variations dimensionnelles des pi\u00e8ces externes de la pompe, pouvant entra\u00eener sa d\u00e9faillance. Ces variations dimensionnelles affectent les jeux de fonctionnement et les ajustements serr\u00e9s \u00e0 l'int\u00e9rieur de la pompe. Des pi\u00e8ces telles que les axes de la roue libre dans la t\u00eate, les bagues dans le carter et les manchons de palier du rotor peuvent perdre leur ajustement serr\u00e9 et \u00eatre expuls\u00e9es de leur logement, provoquant une panne de la pompe et une projection de liquide chaud. Le coefficient de dilatation thermique de la fonte est de seulement 6,5, comparativement faible \u00e0 celui de l'acier et de la fonte ductile (7,0). Cela en fait un mat\u00e9riau id\u00e9al pour la fabrication de pompes.<\/p>\n

La fonte ductile et la fonte mall\u00e9able pr\u00e9sentent une bonne usinabilit\u00e9, une r\u00e9sistance \u00e0 l'usure, un amortissement des vibrations et une faible sensibilit\u00e9 aux entailles. Elles poss\u00e8dent \u00e9galement une r\u00e9sistance \u00e9lev\u00e9e \u00e0 la chaleur, une ductilit\u00e9, une r\u00e9sistance et une t\u00e9nacit\u00e9 importantes. De plus, les pompes en fonte ont des parois plus \u00e9paisses et durables, ce qui les rend r\u00e9sistantes aux chocs et aux impacts. Elles sont \u00e9galement faciles \u00e0 entretenir et \u00e0 r\u00e9parer en cas de dommages. La fonte a un pH de 6 ou plus et se corrode pour former un rev\u00eatement \u00e0 sa surface. Ce rev\u00eatement prot\u00e8ge la pompe contre la corrosion. La fonte offre de meilleures performances de moulage, une meilleure mobilit\u00e9 et une meilleure r\u00e9sistance \u00e0 l'usure que l'acier moul\u00e9.<\/p>\n

Les pompes de puisard en fonte sont durables et constituent un investissement \u00e0 long terme. Une pompe de puisard g\u00e9n\u00e8re une chaleur importante, et un puisard en fonte r\u00e9partit uniform\u00e9ment cette chaleur, prolongeant ainsi la dur\u00e9e de vie de la pompe. La fonte r\u00e9siste aux hautes temp\u00e9ratures et pr\u00e9sente un faible risque de chocs internes. Elle est moins co\u00fbteuse que d'autres m\u00e9taux et ses pi\u00e8ces peuvent \u00eatre fabriqu\u00e9es rapidement. La capacit\u00e9 globale de la pompe est accrue gr\u00e2ce \u00e0 la fonte.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

La fonte est privil\u00e9gi\u00e9e pour diverses applications, notamment la fabrication de pompes. Elle est particuli\u00e8rement adapt\u00e9e aux pompes centrifuges et aux pompes de puisard. La fonte poss\u00e8de des propri\u00e9t\u00e9s physiques et m\u00e9caniques qui la rendent id\u00e9ale pour la fabrication de pompes. Pour les applications \u00e0 haute temp\u00e9rature, le choix du m\u00e9tal appropri\u00e9 d\u00e9pend de trois facteurs.<\/p>","protected":false},"author":1,"featured_media":49,"parent":0,"menu_order":11,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-685","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"\nWhy is cast iron best suited for the manufacturing of pumps?<\/title>\n<meta name=\"description\" content=\"Cast iron is preferred for various purposes including manufacturing of a range of pumps. 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