Two-piece can, method for manufacturing same, and steel...

B - Operations – Transporting – 21 – D

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B21D 51/26 (2006.01) B65D 1/00 (2006.01)

Patent

CA 2618048

The object is to obtain a two-piece can which has sufficient can strength and excellent corrosion resistance and to provide a method for forming the two-piece can easily without generating cracks. The means to achieve the object is to manufacture the two-piece can by the method using a laminated steel sheet as the base material, having the steps of: drawing a cylindrical blank for several times to form a can body in a shape of cylinder integrated with bottom; forming a tapered part extending outward from the can body in the radial direction thereof at the tip of the opening of the can body; applying diametral reduction to the tapered part to the diameter of the can body; and applying diametral reduction to the opening side of the can body to a diameter smaller than the diameter of the can body, while satisfying the formulae (1) and (2). The two-piece can is obtained further by forming a dome protruding inside of the can at the can bottom, by trimming the opening of the can body, by applying diametral reduction to the opening of the can body, after the trimming, to a diameter smaller than the diameter of the can body, while satisfying the formulae (1) and (2), by forming a bead, after the diametral reduction, at the opening end of the can body, by heating the can to a temperature ranging from the glass transition point of the film of the laminated steel sheet to the melting point thereof + 30°C in the stage of the degree of working in a range of 0.2 <= d/R <= 0.5 and of 1.5 <= h/(R - r) <= 2.5, then by applying heat treatment giving rapid cooling to a temperature at or below the glass transition point within 30 seconds. 1.5 <= h/(R - r) (1) d/R <= 0.25 (2) where, h is the height from the can bottom to the tip of the opening, R is the circular blank positional radius, r is the radius of the can bottom, and d is the radius of the tip of the opening.

L~invention concerne une boîte en deux parties à la fois satisfaisante en matière de solidité du corps de boîte, et excellente en matière de résistance à la corrosion; et un procédé de conformage pour la fabrication aisée d~une telle boîte en deux parties sans fissurage. Elle porte sur un procédé de conformage, consistant à former une portion de dôme dans une partie inférieure de barillet de boîte travaillée par étirage pour obtenir une configuration cylindrique avec fond ; à effectuer une opération de rognage d~une portion d~ouverture du barillet de boîte ; à réaliser une opération de réduction de diamètre pour que la portion d~ouverture soit d~un diamètre plus petit que celui du barillet de boîte en satisfaisant aux formules suivantes (1) et (2); et à former une partie nervure à la portion marginale de l~ouverture du barillet de boîte pour ainsi obtenir une boîte en deux parties. Le traitement de ce procédé comporte une phase de traitement thermique, dans laquelle on chauffe une feuille d~acier stratifiée employée à une température supérieure ou égale à la température de transition vitreuse du film de la feuille d~acier stratifiée, mais ne dépassant pas le point de fusion de celle-ci plus 30°C, avant refroidissement rapide à une température ne dépassant pas la température de transition vitreuse dans une période de 30 sec. Les formules sont 1,5 <= h/(R-r) (1) et d/R<=0,25 (2), où h : la hauteur du fond de boîte à la tranche supérieure de l~ouverture, R: le rayon de position d~ébauche circulaire, r : le rayon de la partie fond, et d : le rayon de la tranche supérieure de l~ouverture.

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