Method and equipment for flame cutting a steel part

B - Operations – Transporting – 23 – K

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Details

B23K 7/00 (2006.01) B23K 7/10 (2006.01)

Patent

CA 2717194

The invention relates to a method for flame cutting a part (5, 5a, 5b) made of a metal containing iron, implementing at least one blowtorch (2) having a cutting nozzle (1), wherein the operation is carried out according to the steps of preheating a localized area (6) of the part (5, 5a, 5b) by means of a flame (3) obtained by the combustion of a combustible gas and oxygen, then directing the gaseous oxygen towards the preheated localized area (3) into a first pressure and/or first flow for initiating a bore while shifting the blowtorch (2) in the cutting direction (10). Then, after initiating a bore in the part, the pressure and/or flow of gaseous oxygen is increased in the direction of the bore start area to a second pressure higher than the first pressure and/or a second flow higher than the first flow to obtain the complete bore in the part (5, 5a, 5b). The invention also relates to associated equipment.

L'invention porte sur un procédé d'oxycoupage d'une pièce (5) en un métal contenant du fer, mettant en oeuvre au moins un chalumeau (2) muni d'une buse de coupe (1), dans lequel on opère selon les étapes de préchauffage d'une zone localisé de la pièce (5) au moyen d'une flamme obtenue par combustion d'un gaz combustible et d'oxygène, puis envoi en direction de la zone localisé préchauffée, d'oxygène gazeux à une première pression et/ou à un premier débit pour initier une amorce de perçage tout en décalant le chalumeau (2) dans le sens (10) de la coupe. Ensuite, après l'amorce de perçage de la pièce, on augmente la pression et/ou le débit de l'oxygène gazeux envoyé en direction de la zone de début de perçage jusqu'à une deuxième pression supérieure à la première pression et/ou à un deuxième débit supérieur au premier débit pour obtenir le perçage total de la pièce (5, 5a, 5b). L'invention porte aussi sur une installation associée.

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