Redrawing method and drawn-redrawn can

Details Redrawing method and drawn-redrawn can Redrawing method and drawn-redrawn can

1990-05-23

1991-01-15

Moy, Joseph Man-Fu

Receptacles

Sidewall structure

220600, B65D 5116

Patent

active

049847082

ABSTRACT:
The present invention provides a redrawing method which comprises holding a preliminarily drawn cup of a covered metal sheet by an annular holding member inserted in the cup and a redrawing die, and relatively moving the redrawing die and a redrawing punch arranged coaxially with the holding member and redrawing cup, said drawing punch being capable of going into the holding member and coming out from the holding member, so that the redrawing die and redrawing punch are engaged with each other, to form a deep-drawn cup having a diameter smaller than that of the preliminarily drawn cup. This redrawing method is prominently characterized in that the radius of curvature of the operating corner portion of the redrawing die is 1 to 2.9 times as large as the bare sheet thickness of the metal sheet. According to this redrawing method, the thickness is effectively reduced by bending and elongating of the side wall, and the variation of the thickness between the upper and lower portions of the side wall is eliminated and the thickness is uniformly reduced as a whole.

REFERENCES:
patent: 202514 (1878-04-01), Brennen
patent: 902758 (1908-12-01), Nielsen
patent: 2020827 (1935-11-01), Flanagan
patent: 2344538 (1944-03-01), Crowley
patent: 3463350 (1969-08-01), Unger

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